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Diffstat (limited to 'drivers/android/binder.c')
| -rw-r--r-- | drivers/android/binder.c | 5742 |
1 files changed, 5742 insertions, 0 deletions
diff --git a/drivers/android/binder.c b/drivers/android/binder.c new file mode 100644 index 000000000..35c13be4a --- /dev/null +++ b/drivers/android/binder.c @@ -0,0 +1,5742 @@ +/* binder.c + * + * Android IPC Subsystem + * + * Copyright (C) 2007-2008 Google, Inc. + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +/* + * Locking overview + * + * There are 3 main spinlocks which must be acquired in the + * order shown: + * + * 1) proc->outer_lock : protects binder_ref + * binder_proc_lock() and binder_proc_unlock() are + * used to acq/rel. + * 2) node->lock : protects most fields of binder_node. + * binder_node_lock() and binder_node_unlock() are + * used to acq/rel + * 3) proc->inner_lock : protects the thread and node lists + * (proc->threads, proc->waiting_threads, proc->nodes) + * and all todo lists associated with the binder_proc + * (proc->todo, thread->todo, proc->delivered_death and + * node->async_todo), as well as thread->transaction_stack + * binder_inner_proc_lock() and binder_inner_proc_unlock() + * are used to acq/rel + * + * Any lock under procA must never be nested under any lock at the same + * level or below on procB. + * + * Functions that require a lock held on entry indicate which lock + * in the suffix of the function name: + * + * foo_olocked() : requires node->outer_lock + * foo_nlocked() : requires node->lock + * foo_ilocked() : requires proc->inner_lock + * foo_oilocked(): requires proc->outer_lock and proc->inner_lock + * foo_nilocked(): requires node->lock and proc->inner_lock + * ... + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/fdtable.h> +#include <linux/file.h> +#include <linux/freezer.h> +#include <linux/fs.h> +#include <linux/list.h> +#include <linux/miscdevice.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/nsproxy.h> +#include <linux/poll.h> +#include <linux/debugfs.h> +#include <linux/rbtree.h> +#include <linux/sched/signal.h> +#include <linux/sched/mm.h> +#include <linux/seq_file.h> +#include <linux/uaccess.h> +#include <linux/pid_namespace.h> +#include <linux/security.h> +#include <linux/spinlock.h> +#include <linux/ratelimit.h> + +#include <uapi/linux/android/binder.h> + +#include <asm/cacheflush.h> + +#include "binder_alloc.h" +#include "binder_trace.h" + +static HLIST_HEAD(binder_deferred_list); +static DEFINE_MUTEX(binder_deferred_lock); + +static HLIST_HEAD(binder_devices); +static HLIST_HEAD(binder_procs); +static DEFINE_MUTEX(binder_procs_lock); + +static HLIST_HEAD(binder_dead_nodes); +static DEFINE_SPINLOCK(binder_dead_nodes_lock); + +static struct dentry *binder_debugfs_dir_entry_root; +static struct dentry *binder_debugfs_dir_entry_proc; +static atomic_t binder_last_id; + +#define BINDER_DEBUG_ENTRY(name) \ +static int binder_##name##_open(struct inode *inode, struct file *file) \ +{ \ + return single_open(file, binder_##name##_show, inode->i_private); \ +} \ +\ +static const struct file_operations binder_##name##_fops = { \ + .owner = THIS_MODULE, \ + .open = binder_##name##_open, \ + .read = seq_read, \ + .llseek = seq_lseek, \ + .release = single_release, \ +} + +static int binder_proc_show(struct seq_file *m, void *unused); +BINDER_DEBUG_ENTRY(proc); + +/* This is only defined in include/asm-arm/sizes.h */ +#ifndef SZ_1K +#define SZ_1K 0x400 +#endif + +#ifndef SZ_4M +#define SZ_4M 0x400000 +#endif + +#define FORBIDDEN_MMAP_FLAGS (VM_WRITE) + +enum { + BINDER_DEBUG_USER_ERROR = 1U << 0, + BINDER_DEBUG_FAILED_TRANSACTION = 1U << 1, + BINDER_DEBUG_DEAD_TRANSACTION = 1U << 2, + BINDER_DEBUG_OPEN_CLOSE = 1U << 3, + BINDER_DEBUG_DEAD_BINDER = 1U << 4, + BINDER_DEBUG_DEATH_NOTIFICATION = 1U << 5, + BINDER_DEBUG_READ_WRITE = 1U << 6, + BINDER_DEBUG_USER_REFS = 1U << 7, + BINDER_DEBUG_THREADS = 1U << 8, + BINDER_DEBUG_TRANSACTION = 1U << 9, + BINDER_DEBUG_TRANSACTION_COMPLETE = 1U << 10, + BINDER_DEBUG_FREE_BUFFER = 1U << 11, + BINDER_DEBUG_INTERNAL_REFS = 1U << 12, + BINDER_DEBUG_PRIORITY_CAP = 1U << 13, + BINDER_DEBUG_SPINLOCKS = 1U << 14, +}; +static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR | + BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION; +module_param_named(debug_mask, binder_debug_mask, uint, 0644); + +static char *binder_devices_param = CONFIG_ANDROID_BINDER_DEVICES; +module_param_named(devices, binder_devices_param, charp, 0444); + +static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait); +static int binder_stop_on_user_error; + +static int binder_set_stop_on_user_error(const char *val, + const struct kernel_param *kp) +{ + int ret; + + ret = param_set_int(val, kp); + if (binder_stop_on_user_error < 2) + wake_up(&binder_user_error_wait); + return ret; +} +module_param_call(stop_on_user_error, binder_set_stop_on_user_error, + param_get_int, &binder_stop_on_user_error, 0644); + +#define binder_debug(mask, x...) \ + do { \ + if (binder_debug_mask & mask) \ + pr_info_ratelimited(x); \ + } while (0) + +#define binder_user_error(x...) \ + do { \ + if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \ + pr_info_ratelimited(x); \ + if (binder_stop_on_user_error) \ + binder_stop_on_user_error = 2; \ + } while (0) + +#define to_flat_binder_object(hdr) \ + container_of(hdr, struct flat_binder_object, hdr) + +#define to_binder_fd_object(hdr) container_of(hdr, struct binder_fd_object, hdr) + +#define to_binder_buffer_object(hdr) \ + container_of(hdr, struct binder_buffer_object, hdr) + +#define to_binder_fd_array_object(hdr) \ + container_of(hdr, struct binder_fd_array_object, hdr) + +enum binder_stat_types { + BINDER_STAT_PROC, + BINDER_STAT_THREAD, + BINDER_STAT_NODE, + BINDER_STAT_REF, + BINDER_STAT_DEATH, + BINDER_STAT_TRANSACTION, + BINDER_STAT_TRANSACTION_COMPLETE, + BINDER_STAT_COUNT +}; + +struct binder_stats { + atomic_t br[_IOC_NR(BR_FAILED_REPLY) + 1]; + atomic_t bc[_IOC_NR(BC_REPLY_SG) + 1]; + atomic_t obj_created[BINDER_STAT_COUNT]; + atomic_t obj_deleted[BINDER_STAT_COUNT]; +}; + +static struct binder_stats binder_stats; + +static inline void binder_stats_deleted(enum binder_stat_types type) +{ + atomic_inc(&binder_stats.obj_deleted[type]); +} + +static inline void binder_stats_created(enum binder_stat_types type) +{ + atomic_inc(&binder_stats.obj_created[type]); +} + +struct binder_transaction_log_entry { + int debug_id; + int debug_id_done; + int call_type; + int from_proc; + int from_thread; + int target_handle; + int to_proc; + int to_thread; + int to_node; + int data_size; + int offsets_size; + int return_error_line; + uint32_t return_error; + uint32_t return_error_param; + const char *context_name; +}; +struct binder_transaction_log { + atomic_t cur; + bool full; + struct binder_transaction_log_entry entry[32]; +}; +static struct binder_transaction_log binder_transaction_log; +static struct binder_transaction_log binder_transaction_log_failed; + +static struct binder_transaction_log_entry *binder_transaction_log_add( + struct binder_transaction_log *log) +{ + struct binder_transaction_log_entry *e; + unsigned int cur = atomic_inc_return(&log->cur); + + if (cur >= ARRAY_SIZE(log->entry)) + log->full = true; + e = &log->entry[cur % ARRAY_SIZE(log->entry)]; + WRITE_ONCE(e->debug_id_done, 0); + /* + * write-barrier to synchronize access to e->debug_id_done. + * We make sure the initialized 0 value is seen before + * memset() other fields are zeroed by memset. + */ + smp_wmb(); + memset(e, 0, sizeof(*e)); + return e; +} + +struct binder_context { + struct binder_node *binder_context_mgr_node; + struct mutex context_mgr_node_lock; + + kuid_t binder_context_mgr_uid; + const char *name; +}; + +struct binder_device { + struct hlist_node hlist; + struct miscdevice miscdev; + struct binder_context context; +}; + +/** + * struct binder_work - work enqueued on a worklist + * @entry: node enqueued on list + * @type: type of work to be performed + * + * There are separate work lists for proc, thread, and node (async). + */ +struct binder_work { + struct list_head entry; + + enum binder_work_type { + BINDER_WORK_TRANSACTION = 1, + BINDER_WORK_TRANSACTION_COMPLETE, + BINDER_WORK_RETURN_ERROR, + BINDER_WORK_NODE, + BINDER_WORK_DEAD_BINDER, + BINDER_WORK_DEAD_BINDER_AND_CLEAR, + BINDER_WORK_CLEAR_DEATH_NOTIFICATION, + } type; +}; + +struct binder_error { + struct binder_work work; + uint32_t cmd; +}; + +/** + * struct binder_node - binder node bookkeeping + * @debug_id: unique ID for debugging + * (invariant after initialized) + * @lock: lock for node fields + * @work: worklist element for node work + * (protected by @proc->inner_lock) + * @rb_node: element for proc->nodes tree + * (protected by @proc->inner_lock) + * @dead_node: element for binder_dead_nodes list + * (protected by binder_dead_nodes_lock) + * @proc: binder_proc that owns this node + * (invariant after initialized) + * @refs: list of references on this node + * (protected by @lock) + * @internal_strong_refs: used to take strong references when + * initiating a transaction + * (protected by @proc->inner_lock if @proc + * and by @lock) + * @local_weak_refs: weak user refs from local process + * (protected by @proc->inner_lock if @proc + * and by @lock) + * @local_strong_refs: strong user refs from local process + * (protected by @proc->inner_lock if @proc + * and by @lock) + * @tmp_refs: temporary kernel refs + * (protected by @proc->inner_lock while @proc + * is valid, and by binder_dead_nodes_lock + * if @proc is NULL. During inc/dec and node release + * it is also protected by @lock to provide safety + * as the node dies and @proc becomes NULL) + * @ptr: userspace pointer for node + * (invariant, no lock needed) + * @cookie: userspace cookie for node + * (invariant, no lock needed) + * @has_strong_ref: userspace notified of strong ref + * (protected by @proc->inner_lock if @proc + * and by @lock) + * @pending_strong_ref: userspace has acked notification of strong ref + * (protected by @proc->inner_lock if @proc + * and by @lock) + * @has_weak_ref: userspace notified of weak ref + * (protected by @proc->inner_lock if @proc + * and by @lock) + * @pending_weak_ref: userspace has acked notification of weak ref + * (protected by @proc->inner_lock if @proc + * and by @lock) + * @has_async_transaction: async transaction to node in progress + * (protected by @lock) + * @accept_fds: file descriptor operations supported for node + * (invariant after initialized) + * @min_priority: minimum scheduling priority + * (invariant after initialized) + * @async_todo: list of async work items + * (protected by @proc->inner_lock) + * + * Bookkeeping structure for binder nodes. + */ +struct binder_node { + int debug_id; + spinlock_t lock; + struct binder_work work; + union { + struct rb_node rb_node; + struct hlist_node dead_node; + }; + struct binder_proc *proc; + struct hlist_head refs; + int internal_strong_refs; + int local_weak_refs; + int local_strong_refs; + int tmp_refs; + binder_uintptr_t ptr; + binder_uintptr_t cookie; + struct { + /* + * bitfield elements protected by + * proc inner_lock + */ + u8 has_strong_ref:1; + u8 pending_strong_ref:1; + u8 has_weak_ref:1; + u8 pending_weak_ref:1; + }; + struct { + /* + * invariant after initialization + */ + u8 accept_fds:1; + u8 min_priority; + }; + bool has_async_transaction; + struct list_head async_todo; +}; + +struct binder_ref_death { + /** + * @work: worklist element for death notifications + * (protected by inner_lock of the proc that + * this ref belongs to) + */ + struct binder_work work; + binder_uintptr_t cookie; +}; + +/** + * struct binder_ref_data - binder_ref counts and id + * @debug_id: unique ID for the ref + * @desc: unique userspace handle for ref + * @strong: strong ref count (debugging only if not locked) + * @weak: weak ref count (debugging only if not locked) + * + * Structure to hold ref count and ref id information. Since + * the actual ref can only be accessed with a lock, this structure + * is used to return information about the ref to callers of + * ref inc/dec functions. + */ +struct binder_ref_data { + int debug_id; + uint32_t desc; + int strong; + int weak; +}; + +/** + * struct binder_ref - struct to track references on nodes + * @data: binder_ref_data containing id, handle, and current refcounts + * @rb_node_desc: node for lookup by @data.desc in proc's rb_tree + * @rb_node_node: node for lookup by @node in proc's rb_tree + * @node_entry: list entry for node->refs list in target node + * (protected by @node->lock) + * @proc: binder_proc containing ref + * @node: binder_node of target node. When cleaning up a + * ref for deletion in binder_cleanup_ref, a non-NULL + * @node indicates the node must be freed + * @death: pointer to death notification (ref_death) if requested + * (protected by @node->lock) + * + * Structure to track references from procA to target node (on procB). This + * structure is unsafe to access without holding @proc->outer_lock. + */ +struct binder_ref { + /* Lookups needed: */ + /* node + proc => ref (transaction) */ + /* desc + proc => ref (transaction, inc/dec ref) */ + /* node => refs + procs (proc exit) */ + struct binder_ref_data data; + struct rb_node rb_node_desc; + struct rb_node rb_node_node; + struct hlist_node node_entry; + struct binder_proc *proc; + struct binder_node *node; + struct binder_ref_death *death; +}; + +enum binder_deferred_state { + BINDER_DEFERRED_PUT_FILES = 0x01, + BINDER_DEFERRED_FLUSH = 0x02, + BINDER_DEFERRED_RELEASE = 0x04, +}; + +/** + * struct binder_proc - binder process bookkeeping + * @proc_node: element for binder_procs list + * @threads: rbtree of binder_threads in this proc + * (protected by @inner_lock) + * @nodes: rbtree of binder nodes associated with + * this proc ordered by node->ptr + * (protected by @inner_lock) + * @refs_by_desc: rbtree of refs ordered by ref->desc + * (protected by @outer_lock) + * @refs_by_node: rbtree of refs ordered by ref->node + * (protected by @outer_lock) + * @waiting_threads: threads currently waiting for proc work + * (protected by @inner_lock) + * @pid PID of group_leader of process + * (invariant after initialized) + * @tsk task_struct for group_leader of process + * (invariant after initialized) + * @files files_struct for process + * (protected by @files_lock) + * @files_lock mutex to protect @files + * @cred struct cred associated with the `struct file` + * in binder_open() + * (invariant after initialized) + * @deferred_work_node: element for binder_deferred_list + * (protected by binder_deferred_lock) + * @deferred_work: bitmap of deferred work to perform + * (protected by binder_deferred_lock) + * @is_dead: process is dead and awaiting free + * when outstanding transactions are cleaned up + * (protected by @inner_lock) + * @todo: list of work for this process + * (protected by @inner_lock) + * @stats: per-process binder statistics + * (atomics, no lock needed) + * @delivered_death: list of delivered death notification + * (protected by @inner_lock) + * @max_threads: cap on number of binder threads + * (protected by @inner_lock) + * @requested_threads: number of binder threads requested but not + * yet started. In current implementation, can + * only be 0 or 1. + * (protected by @inner_lock) + * @requested_threads_started: number binder threads started + * (protected by @inner_lock) + * @tmp_ref: temporary reference to indicate proc is in use + * (protected by @inner_lock) + * @default_priority: default scheduler priority + * (invariant after initialized) + * @debugfs_entry: debugfs node + * @alloc: binder allocator bookkeeping + * @context: binder_context for this proc + * (invariant after initialized) + * @inner_lock: can nest under outer_lock and/or node lock + * @outer_lock: no nesting under innor or node lock + * Lock order: 1) outer, 2) node, 3) inner + * + * Bookkeeping structure for binder processes + */ +struct binder_proc { + struct hlist_node proc_node; + struct rb_root threads; + struct rb_root nodes; + struct rb_root refs_by_desc; + struct rb_root refs_by_node; + struct list_head waiting_threads; + int pid; + struct task_struct *tsk; + struct files_struct *files; + struct mutex files_lock; + const struct cred *cred; + struct hlist_node deferred_work_node; + int deferred_work; + bool is_dead; + + struct list_head todo; + struct binder_stats stats; + struct list_head delivered_death; + int max_threads; + int requested_threads; + int requested_threads_started; + int tmp_ref; + long default_priority; + struct dentry *debugfs_entry; + struct binder_alloc alloc; + struct binder_context *context; + spinlock_t inner_lock; + spinlock_t outer_lock; +}; + +enum { + BINDER_LOOPER_STATE_REGISTERED = 0x01, + BINDER_LOOPER_STATE_ENTERED = 0x02, + BINDER_LOOPER_STATE_EXITED = 0x04, + BINDER_LOOPER_STATE_INVALID = 0x08, + BINDER_LOOPER_STATE_WAITING = 0x10, + BINDER_LOOPER_STATE_POLL = 0x20, +}; + +/** + * struct binder_thread - binder thread bookkeeping + * @proc: binder process for this thread + * (invariant after initialization) + * @rb_node: element for proc->threads rbtree + * (protected by @proc->inner_lock) + * @waiting_thread_node: element for @proc->waiting_threads list + * (protected by @proc->inner_lock) + * @pid: PID for this thread + * (invariant after initialization) + * @looper: bitmap of looping state + * (only accessed by this thread) + * @looper_needs_return: looping thread needs to exit driver + * (no lock needed) + * @transaction_stack: stack of in-progress transactions for this thread + * (protected by @proc->inner_lock) + * @todo: list of work to do for this thread + * (protected by @proc->inner_lock) + * @process_todo: whether work in @todo should be processed + * (protected by @proc->inner_lock) + * @return_error: transaction errors reported by this thread + * (only accessed by this thread) + * @reply_error: transaction errors reported by target thread + * (protected by @proc->inner_lock) + * @wait: wait queue for thread work + * @stats: per-thread statistics + * (atomics, no lock needed) + * @tmp_ref: temporary reference to indicate thread is in use + * (atomic since @proc->inner_lock cannot + * always be acquired) + * @is_dead: thread is dead and awaiting free + * when outstanding transactions are cleaned up + * (protected by @proc->inner_lock) + * + * Bookkeeping structure for binder threads. + */ +struct binder_thread { + struct binder_proc *proc; + struct rb_node rb_node; + struct list_head waiting_thread_node; + int pid; + int looper; /* only modified by this thread */ + bool looper_need_return; /* can be written by other thread */ + struct binder_transaction *transaction_stack; + struct list_head todo; + bool process_todo; + struct binder_error return_error; + struct binder_error reply_error; + wait_queue_head_t wait; + struct binder_stats stats; + atomic_t tmp_ref; + bool is_dead; +}; + +struct binder_transaction { + int debug_id; + struct binder_work work; + struct binder_thread *from; + struct binder_transaction *from_parent; + struct binder_proc *to_proc; + struct binder_thread *to_thread; + struct binder_transaction *to_parent; + unsigned need_reply:1; + /* unsigned is_dead:1; */ /* not used at the moment */ + + struct binder_buffer *buffer; + unsigned int code; + unsigned int flags; + long priority; + long saved_priority; + kuid_t sender_euid; + /** + * @lock: protects @from, @to_proc, and @to_thread + * + * @from, @to_proc, and @to_thread can be set to NULL + * during thread teardown + */ + spinlock_t lock; +}; + +/** + * binder_proc_lock() - Acquire outer lock for given binder_proc + * @proc: struct binder_proc to acquire + * + * Acquires proc->outer_lock. Used to protect binder_ref + * structures associated with the given proc. + */ +#define binder_proc_lock(proc) _binder_proc_lock(proc, __LINE__) +static void +_binder_proc_lock(struct binder_proc *proc, int line) +{ + binder_debug(BINDER_DEBUG_SPINLOCKS, + "%s: line=%d\n", __func__, line); + spin_lock(&proc->outer_lock); +} + +/** + * binder_proc_unlock() - Release spinlock for given binder_proc + * @proc: struct binder_proc to acquire + * + * Release lock acquired via binder_proc_lock() + */ +#define binder_proc_unlock(_proc) _binder_proc_unlock(_proc, __LINE__) +static void +_binder_proc_unlock(struct binder_proc *proc, int line) +{ + binder_debug(BINDER_DEBUG_SPINLOCKS, + "%s: line=%d\n", __func__, line); + spin_unlock(&proc->outer_lock); +} + +/** + * binder_inner_proc_lock() - Acquire inner lock for given binder_proc + * @proc: struct binder_proc to acquire + * + * Acquires proc->inner_lock. Used to protect todo lists + */ +#define binder_inner_proc_lock(proc) _binder_inner_proc_lock(proc, __LINE__) +static void +_binder_inner_proc_lock(struct binder_proc *proc, int line) +{ + binder_debug(BINDER_DEBUG_SPINLOCKS, + "%s: line=%d\n", __func__, line); + spin_lock(&proc->inner_lock); +} + +/** + * binder_inner_proc_unlock() - Release inner lock for given binder_proc + * @proc: struct binder_proc to acquire + * + * Release lock acquired via binder_inner_proc_lock() + */ +#define binder_inner_proc_unlock(proc) _binder_inner_proc_unlock(proc, __LINE__) +static void +_binder_inner_proc_unlock(struct binder_proc *proc, int line) +{ + binder_debug(BINDER_DEBUG_SPINLOCKS, + "%s: line=%d\n", __func__, line); + spin_unlock(&proc->inner_lock); +} + +/** + * binder_node_lock() - Acquire spinlock for given binder_node + * @node: struct binder_node to acquire + * + * Acquires node->lock. Used to protect binder_node fields + */ +#define binder_node_lock(node) _binder_node_lock(node, __LINE__) +static void +_binder_node_lock(struct binder_node *node, int line) +{ + binder_debug(BINDER_DEBUG_SPINLOCKS, + "%s: line=%d\n", __func__, line); + spin_lock(&node->lock); +} + +/** + * binder_node_unlock() - Release spinlock for given binder_proc + * @node: struct binder_node to acquire + * + * Release lock acquired via binder_node_lock() + */ +#define binder_node_unlock(node) _binder_node_unlock(node, __LINE__) +static void +_binder_node_unlock(struct binder_node *node, int line) +{ + binder_debug(BINDER_DEBUG_SPINLOCKS, + "%s: line=%d\n", __func__, line); + spin_unlock(&node->lock); +} + +/** + * binder_node_inner_lock() - Acquire node and inner locks + * @node: struct binder_node to acquire + * + * Acquires node->lock. If node->proc also acquires + * proc->inner_lock. Used to protect binder_node fields + */ +#define binder_node_inner_lock(node) _binder_node_inner_lock(node, __LINE__) +static void +_binder_node_inner_lock(struct binder_node *node, int line) +{ + binder_debug(BINDER_DEBUG_SPINLOCKS, + "%s: line=%d\n", __func__, line); + spin_lock(&node->lock); + if (node->proc) + binder_inner_proc_lock(node->proc); +} + +/** + * binder_node_unlock() - Release node and inner locks + * @node: struct binder_node to acquire + * + * Release lock acquired via binder_node_lock() + */ +#define binder_node_inner_unlock(node) _binder_node_inner_unlock(node, __LINE__) +static void +_binder_node_inner_unlock(struct binder_node *node, int line) +{ + struct binder_proc *proc = node->proc; + + binder_debug(BINDER_DEBUG_SPINLOCKS, + "%s: line=%d\n", __func__, line); + if (proc) + binder_inner_proc_unlock(proc); + spin_unlock(&node->lock); +} + +static bool binder_worklist_empty_ilocked(struct list_head *list) +{ + return list_empty(list); +} + +/** + * binder_worklist_empty() - Check if no items on the work list + * @proc: binder_proc associated with list + * @list: list to check + * + * Return: true if there are no items on list, else false + */ +static bool binder_worklist_empty(struct binder_proc *proc, + struct list_head *list) +{ + bool ret; + + binder_inner_proc_lock(proc); + ret = binder_worklist_empty_ilocked(list); + binder_inner_proc_unlock(proc); + return ret; +} + +/** + * binder_enqueue_work_ilocked() - Add an item to the work list + * @work: struct binder_work to add to list + * @target_list: list to add work to + * + * Adds the work to the specified list. Asserts that work + * is not already on a list. + * + * Requires the proc->inner_lock to be held. + */ +static void +binder_enqueue_work_ilocked(struct binder_work *work, + struct list_head *target_list) +{ + BUG_ON(target_list == NULL); + BUG_ON(work->entry.next && !list_empty(&work->entry)); + list_add_tail(&work->entry, target_list); +} + +/** + * binder_enqueue_deferred_thread_work_ilocked() - Add deferred thread work + * @thread: thread to queue work to + * @work: struct binder_work to add to list + * + * Adds the work to the todo list of the thread. Doesn't set the process_todo + * flag, which means that (if it wasn't already set) the thread will go to + * sleep without handling this work when it calls read. + * + * Requires the proc->inner_lock to be held. + */ +static void +binder_enqueue_deferred_thread_work_ilocked(struct binder_thread *thread, + struct binder_work *work) +{ + WARN_ON(!list_empty(&thread->waiting_thread_node)); + binder_enqueue_work_ilocked(work, &thread->todo); +} + +/** + * binder_enqueue_thread_work_ilocked() - Add an item to the thread work list + * @thread: thread to queue work to + * @work: struct binder_work to add to list + * + * Adds the work to the todo list of the thread, and enables processing + * of the todo queue. + * + * Requires the proc->inner_lock to be held. + */ +static void +binder_enqueue_thread_work_ilocked(struct binder_thread *thread, + struct binder_work *work) +{ + WARN_ON(!list_empty(&thread->waiting_thread_node)); + binder_enqueue_work_ilocked(work, &thread->todo); + thread->process_todo = true; +} + +/** + * binder_enqueue_thread_work() - Add an item to the thread work list + * @thread: thread to queue work to + * @work: struct binder_work to add to list + * + * Adds the work to the todo list of the thread, and enables processing + * of the todo queue. + */ +static void +binder_enqueue_thread_work(struct binder_thread *thread, + struct binder_work *work) +{ + binder_inner_proc_lock(thread->proc); + binder_enqueue_thread_work_ilocked(thread, work); + binder_inner_proc_unlock(thread->proc); +} + +static void +binder_dequeue_work_ilocked(struct binder_work *work) +{ + list_del_init(&work->entry); +} + +/** + * binder_dequeue_work() - Removes an item from the work list + * @proc: binder_proc associated with list + * @work: struct binder_work to remove from list + * + * Removes the specified work item from whatever list it is on. + * Can safely be called if work is not on any list. + */ +static void +binder_dequeue_work(struct binder_proc *proc, struct binder_work *work) +{ + binder_inner_proc_lock(proc); + binder_dequeue_work_ilocked(work); + binder_inner_proc_unlock(proc); +} + +static struct binder_work *binder_dequeue_work_head_ilocked( + struct list_head *list) +{ + struct binder_work *w; + + w = list_first_entry_or_null(list, struct binder_work, entry); + if (w) + list_del_init(&w->entry); + return w; +} + +static void +binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer); +static void binder_free_thread(struct binder_thread *thread); +static void binder_free_proc(struct binder_proc *proc); +static void binder_inc_node_tmpref_ilocked(struct binder_node *node); + +static int task_get_unused_fd_flags(struct binder_proc *proc, int flags) +{ + unsigned long rlim_cur; + unsigned long irqs; + int ret; + + mutex_lock(&proc->files_lock); + if (proc->files == NULL) { + ret = -ESRCH; + goto err; + } + if (!lock_task_sighand(proc->tsk, &irqs)) { + ret = -EMFILE; + goto err; + } + rlim_cur = task_rlimit(proc->tsk, RLIMIT_NOFILE); + unlock_task_sighand(proc->tsk, &irqs); + + ret = __alloc_fd(proc->files, 0, rlim_cur, flags); +err: + mutex_unlock(&proc->files_lock); + return ret; +} + +/* + * copied from fd_install + */ +static void task_fd_install( + struct binder_proc *proc, unsigned int fd, struct file *file) +{ + mutex_lock(&proc->files_lock); + if (proc->files) + __fd_install(proc->files, fd, file); + mutex_unlock(&proc->files_lock); +} + +/* + * copied from sys_close + */ +static long task_close_fd(struct binder_proc *proc, unsigned int fd) +{ + int retval; + + mutex_lock(&proc->files_lock); + if (proc->files == NULL) { + retval = -ESRCH; + goto err; + } + retval = __close_fd(proc->files, fd); + /* can't restart close syscall because file table entry was cleared */ + if (unlikely(retval == -ERESTARTSYS || + retval == -ERESTARTNOINTR || + retval == -ERESTARTNOHAND || + retval == -ERESTART_RESTARTBLOCK)) + retval = -EINTR; +err: + mutex_unlock(&proc->files_lock); + return retval; +} + +static bool binder_has_work_ilocked(struct binder_thread *thread, + bool do_proc_work) +{ + return thread->process_todo || + thread->looper_need_return || + (do_proc_work && + !binder_worklist_empty_ilocked(&thread->proc->todo)); +} + +static bool binder_has_work(struct binder_thread *thread, bool do_proc_work) +{ + bool has_work; + + binder_inner_proc_lock(thread->proc); + has_work = binder_has_work_ilocked(thread, do_proc_work); + binder_inner_proc_unlock(thread->proc); + + return has_work; +} + +static bool binder_available_for_proc_work_ilocked(struct binder_thread *thread) +{ + return !thread->transaction_stack && + binder_worklist_empty_ilocked(&thread->todo) && + (thread->looper & (BINDER_LOOPER_STATE_ENTERED | + BINDER_LOOPER_STATE_REGISTERED)); +} + +static void binder_wakeup_poll_threads_ilocked(struct binder_proc *proc, + bool sync) +{ + struct rb_node *n; + struct binder_thread *thread; + + for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) { + thread = rb_entry(n, struct binder_thread, rb_node); + if (thread->looper & BINDER_LOOPER_STATE_POLL && + binder_available_for_proc_work_ilocked(thread)) { + if (sync) + wake_up_interruptible_sync(&thread->wait); + else + wake_up_interruptible(&thread->wait); + } + } +} + +/** + * binder_select_thread_ilocked() - selects a thread for doing proc work. + * @proc: process to select a thread from + * + * Note that calling this function moves the thread off the waiting_threads + * list, so it can only be woken up by the caller of this function, or a + * signal. Therefore, callers *should* always wake up the thread this function + * returns. + * + * Return: If there's a thread currently waiting for process work, + * returns that thread. Otherwise returns NULL. + */ +static struct binder_thread * +binder_select_thread_ilocked(struct binder_proc *proc) +{ + struct binder_thread *thread; + + assert_spin_locked(&proc->inner_lock); + thread = list_first_entry_or_null(&proc->waiting_threads, + struct binder_thread, + waiting_thread_node); + + if (thread) + list_del_init(&thread->waiting_thread_node); + + return thread; +} + +/** + * binder_wakeup_thread_ilocked() - wakes up a thread for doing proc work. + * @proc: process to wake up a thread in + * @thread: specific thread to wake-up (may be NULL) + * @sync: whether to do a synchronous wake-up + * + * This function wakes up a thread in the @proc process. + * The caller may provide a specific thread to wake-up in + * the @thread parameter. If @thread is NULL, this function + * will wake up threads that have called poll(). + * + * Note that for this function to work as expected, callers + * should first call binder_select_thread() to find a thread + * to handle the work (if they don't have a thread already), + * and pass the result into the @thread parameter. + */ +static void binder_wakeup_thread_ilocked(struct binder_proc *proc, + struct binder_thread *thread, + bool sync) +{ + assert_spin_locked(&proc->inner_lock); + + if (thread) { + if (sync) + wake_up_interruptible_sync(&thread->wait); + else + wake_up_interruptible(&thread->wait); + return; + } + + /* Didn't find a thread waiting for proc work; this can happen + * in two scenarios: + * 1. All threads are busy handling transactions + * In that case, one of those threads should call back into + * the kernel driver soon and pick up this work. + * 2. Threads are using the (e)poll interface, in which case + * they may be blocked on the waitqueue without having been + * added to waiting_threads. For this case, we just iterate + * over all threads not handling transaction work, and + * wake them all up. We wake all because we don't know whether + * a thread that called into (e)poll is handling non-binder + * work currently. + */ + binder_wakeup_poll_threads_ilocked(proc, sync); +} + +static void binder_wakeup_proc_ilocked(struct binder_proc *proc) +{ + struct binder_thread *thread = binder_select_thread_ilocked(proc); + + binder_wakeup_thread_ilocked(proc, thread, /* sync = */false); +} + +static void binder_set_nice(long nice) +{ + long min_nice; + + if (can_nice(current, nice)) { + set_user_nice(current, nice); + return; + } + min_nice = rlimit_to_nice(rlimit(RLIMIT_NICE)); + binder_debug(BINDER_DEBUG_PRIORITY_CAP, + "%d: nice value %ld not allowed use %ld instead\n", + current->pid, nice, min_nice); + set_user_nice(current, min_nice); + if (min_nice <= MAX_NICE) + return; + binder_user_error("%d RLIMIT_NICE not set\n", current->pid); +} + +static struct binder_node *binder_get_node_ilocked(struct binder_proc *proc, + binder_uintptr_t ptr) +{ + struct rb_node *n = proc->nodes.rb_node; + struct binder_node *node; + + assert_spin_locked(&proc->inner_lock); + + while (n) { + node = rb_entry(n, struct binder_node, rb_node); + + if (ptr < node->ptr) + n = n->rb_left; + else if (ptr > node->ptr) + n = n->rb_right; + else { + /* + * take an implicit weak reference + * to ensure node stays alive until + * call to binder_put_node() + */ + binder_inc_node_tmpref_ilocked(node); + return node; + } + } + return NULL; +} + +static struct binder_node *binder_get_node(struct binder_proc *proc, + binder_uintptr_t ptr) +{ + struct binder_node *node; + + binder_inner_proc_lock(proc); + node = binder_get_node_ilocked(proc, ptr); + binder_inner_proc_unlock(proc); + return node; +} + +static struct binder_node *binder_init_node_ilocked( + struct binder_proc *proc, + struct binder_node *new_node, + struct flat_binder_object *fp) +{ + struct rb_node **p = &proc->nodes.rb_node; + struct rb_node *parent = NULL; + struct binder_node *node; + binder_uintptr_t ptr = fp ? fp->binder : 0; + binder_uintptr_t cookie = fp ? fp->cookie : 0; + __u32 flags = fp ? fp->flags : 0; + + assert_spin_locked(&proc->inner_lock); + + while (*p) { + + parent = *p; + node = rb_entry(parent, struct binder_node, rb_node); + + if (ptr < node->ptr) + p = &(*p)->rb_left; + else if (ptr > node->ptr) + p = &(*p)->rb_right; + else { + /* + * A matching node is already in + * the rb tree. Abandon the init + * and return it. + */ + binder_inc_node_tmpref_ilocked(node); + return node; + } + } + node = new_node; + binder_stats_created(BINDER_STAT_NODE); + node->tmp_refs++; + rb_link_node(&node->rb_node, parent, p); + rb_insert_color(&node->rb_node, &proc->nodes); + node->debug_id = atomic_inc_return(&binder_last_id); + node->proc = proc; + node->ptr = ptr; + node->cookie = cookie; + node->work.type = BINDER_WORK_NODE; + node->min_priority = flags & FLAT_BINDER_FLAG_PRIORITY_MASK; + node->accept_fds = !!(flags & FLAT_BINDER_FLAG_ACCEPTS_FDS); + spin_lock_init(&node->lock); + INIT_LIST_HEAD(&node->work.entry); + INIT_LIST_HEAD(&node->async_todo); + binder_debug(BINDER_DEBUG_INTERNAL_REFS, + "%d:%d node %d u%016llx c%016llx created\n", + proc->pid, current->pid, node->debug_id, + (u64)node->ptr, (u64)node->cookie); + + return node; +} + +static struct binder_node *binder_new_node(struct binder_proc *proc, + struct flat_binder_object *fp) +{ + struct binder_node *node; + struct binder_node *new_node = kzalloc(sizeof(*node), GFP_KERNEL); + + if (!new_node) + return NULL; + binder_inner_proc_lock(proc); + node = binder_init_node_ilocked(proc, new_node, fp); + binder_inner_proc_unlock(proc); + if (node != new_node) + /* + * The node was already added by another thread + */ + kfree(new_node); + + return node; +} + +static void binder_free_node(struct binder_node *node) +{ + kfree(node); + binder_stats_deleted(BINDER_STAT_NODE); +} + +static int binder_inc_node_nilocked(struct binder_node *node, int strong, + int internal, + struct list_head *target_list) +{ + struct binder_proc *proc = node->proc; + + assert_spin_locked(&node->lock); + if (proc) + assert_spin_locked(&proc->inner_lock); + if (strong) { + if (internal) { + if (target_list == NULL && + node->internal_strong_refs == 0 && + !(node->proc && + node == node->proc->context->binder_context_mgr_node && + node->has_strong_ref)) { + pr_err("invalid inc strong node for %d\n", + node->debug_id); + return -EINVAL; + } + node->internal_strong_refs++; + } else + node->local_strong_refs++; + if (!node->has_strong_ref && target_list) { + struct binder_thread *thread = container_of(target_list, + struct binder_thread, todo); + binder_dequeue_work_ilocked(&node->work); + BUG_ON(&thread->todo != target_list); + binder_enqueue_deferred_thread_work_ilocked(thread, + &node->work); + } + } else { + if (!internal) + node->local_weak_refs++; + if (!node->has_weak_ref && list_empty(&node->work.entry)) { + if (target_list == NULL) { + pr_err("invalid inc weak node for %d\n", + node->debug_id); + return -EINVAL; + } + /* + * See comment above + */ + binder_enqueue_work_ilocked(&node->work, target_list); + } + } + return 0; +} + +static int binder_inc_node(struct binder_node *node, int strong, int internal, + struct list_head *target_list) +{ + int ret; + + binder_node_inner_lock(node); + ret = binder_inc_node_nilocked(node, strong, internal, target_list); + binder_node_inner_unlock(node); + + return ret; +} + +static bool binder_dec_node_nilocked(struct binder_node *node, + int strong, int internal) +{ + struct binder_proc *proc = node->proc; + + assert_spin_locked(&node->lock); + if (proc) + assert_spin_locked(&proc->inner_lock); + if (strong) { + if (internal) + node->internal_strong_refs--; + else + node->local_strong_refs--; + if (node->local_strong_refs || node->internal_strong_refs) + return false; + } else { + if (!internal) + node->local_weak_refs--; + if (node->local_weak_refs || node->tmp_refs || + !hlist_empty(&node->refs)) + return false; + } + + if (proc && (node->has_strong_ref || node->has_weak_ref)) { + if (list_empty(&node->work.entry)) { + binder_enqueue_work_ilocked(&node->work, &proc->todo); + binder_wakeup_proc_ilocked(proc); + } + } else { + if (hlist_empty(&node->refs) && !node->local_strong_refs && + !node->local_weak_refs && !node->tmp_refs) { + if (proc) { + binder_dequeue_work_ilocked(&node->work); + rb_erase(&node->rb_node, &proc->nodes); + binder_debug(BINDER_DEBUG_INTERNAL_REFS, + "refless node %d deleted\n", + node->debug_id); + } else { + BUG_ON(!list_empty(&node->work.entry)); + spin_lock(&binder_dead_nodes_lock); + /* + * tmp_refs could have changed so + * check it again + */ + if (node->tmp_refs) { + spin_unlock(&binder_dead_nodes_lock); + return false; + } + hlist_del(&node->dead_node); + spin_unlock(&binder_dead_nodes_lock); + binder_debug(BINDER_DEBUG_INTERNAL_REFS, + "dead node %d deleted\n", + node->debug_id); + } + return true; + } + } + return false; +} + +static void binder_dec_node(struct binder_node *node, int strong, int internal) +{ + bool free_node; + + binder_node_inner_lock(node); + free_node = binder_dec_node_nilocked(node, strong, internal); + binder_node_inner_unlock(node); + if (free_node) + binder_free_node(node); +} + +static void binder_inc_node_tmpref_ilocked(struct binder_node *node) +{ + /* + * No call to binder_inc_node() is needed since we + * don't need to inform userspace of any changes to + * tmp_refs + */ + node->tmp_refs++; +} + +/** + * binder_inc_node_tmpref() - take a temporary reference on node + * @node: node to reference + * + * Take reference on node to prevent the node from being freed + * while referenced only by a local variable. The inner lock is + * needed to serialize with the node work on the queue (which + * isn't needed after the node is dead). If the node is dead + * (node->proc is NULL), use binder_dead_nodes_lock to protect + * node->tmp_refs against dead-node-only cases where the node + * lock cannot be acquired (eg traversing the dead node list to + * print nodes) + */ +static void binder_inc_node_tmpref(struct binder_node *node) +{ + binder_node_lock(node); + if (node->proc) + binder_inner_proc_lock(node->proc); + else + spin_lock(&binder_dead_nodes_lock); + binder_inc_node_tmpref_ilocked(node); + if (node->proc) + binder_inner_proc_unlock(node->proc); + else + spin_unlock(&binder_dead_nodes_lock); + binder_node_unlock(node); +} + +/** + * binder_dec_node_tmpref() - remove a temporary reference on node + * @node: node to reference + * + * Release temporary reference on node taken via binder_inc_node_tmpref() + */ +static void binder_dec_node_tmpref(struct binder_node *node) +{ + bool free_node; + + binder_node_inner_lock(node); + if (!node->proc) + spin_lock(&binder_dead_nodes_lock); + node->tmp_refs--; + BUG_ON(node->tmp_refs < 0); + if (!node->proc) + spin_unlock(&binder_dead_nodes_lock); + /* + * Call binder_dec_node() to check if all refcounts are 0 + * and cleanup is needed. Calling with strong=0 and internal=1 + * causes no actual reference to be released in binder_dec_node(). + * If that changes, a change is needed here too. + */ + free_node = binder_dec_node_nilocked(node, 0, 1); + binder_node_inner_unlock(node); + if (free_node) + binder_free_node(node); +} + +static void binder_put_node(struct binder_node *node) +{ + binder_dec_node_tmpref(node); +} + +static struct binder_ref *binder_get_ref_olocked(struct binder_proc *proc, + u32 desc, bool need_strong_ref) +{ + struct rb_node *n = proc->refs_by_desc.rb_node; + struct binder_ref *ref; + + while (n) { + ref = rb_entry(n, struct binder_ref, rb_node_desc); + + if (desc < ref->data.desc) { + n = n->rb_left; + } else if (desc > ref->data.desc) { + n = n->rb_right; + } else if (need_strong_ref && !ref->data.strong) { + binder_user_error("tried to use weak ref as strong ref\n"); + return NULL; + } else { + return ref; + } + } + return NULL; +} + +/** + * binder_get_ref_for_node_olocked() - get the ref associated with given node + * @proc: binder_proc that owns the ref + * @node: binder_node of target + * @new_ref: newly allocated binder_ref to be initialized or %NULL + * + * Look up the ref for the given node and return it if it exists + * + * If it doesn't exist and the caller provides a newly allocated + * ref, initialize the fields of the newly allocated ref and insert + * into the given proc rb_trees and node refs list. + * + * Return: the ref for node. It is possible that another thread + * allocated/initialized the ref first in which case the + * returned ref would be different than the passed-in + * new_ref. new_ref must be kfree'd by the caller in + * this case. + */ +static struct binder_ref *binder_get_ref_for_node_olocked( + struct binder_proc *proc, + struct binder_node *node, + struct binder_ref *new_ref) +{ + struct binder_context *context = proc->context; + struct rb_node **p = &proc->refs_by_node.rb_node; + struct rb_node *parent = NULL; + struct binder_ref *ref; + struct rb_node *n; + + while (*p) { + parent = *p; + ref = rb_entry(parent, struct binder_ref, rb_node_node); + + if (node < ref->node) + p = &(*p)->rb_left; + else if (node > ref->node) + p = &(*p)->rb_right; + else + return ref; + } + if (!new_ref) + return NULL; + + binder_stats_created(BINDER_STAT_REF); + new_ref->data.debug_id = atomic_inc_return(&binder_last_id); + new_ref->proc = proc; + new_ref->node = node; + rb_link_node(&new_ref->rb_node_node, parent, p); + rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node); + + new_ref->data.desc = (node == context->binder_context_mgr_node) ? 0 : 1; + for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) { + ref = rb_entry(n, struct binder_ref, rb_node_desc); + if (ref->data.desc > new_ref->data.desc) + break; + new_ref->data.desc = ref->data.desc + 1; + } + + p = &proc->refs_by_desc.rb_node; + while (*p) { + parent = *p; + ref = rb_entry(parent, struct binder_ref, rb_node_desc); + + if (new_ref->data.desc < ref->data.desc) + p = &(*p)->rb_left; + else if (new_ref->data.desc > ref->data.desc) + p = &(*p)->rb_right; + else + BUG(); + } + rb_link_node(&new_ref->rb_node_desc, parent, p); + rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc); + + binder_node_lock(node); + hlist_add_head(&new_ref->node_entry, &node->refs); + + binder_debug(BINDER_DEBUG_INTERNAL_REFS, + "%d new ref %d desc %d for node %d\n", + proc->pid, new_ref->data.debug_id, new_ref->data.desc, + node->debug_id); + binder_node_unlock(node); + return new_ref; +} + +static void binder_cleanup_ref_olocked(struct binder_ref *ref) +{ + bool delete_node = false; + + binder_debug(BINDER_DEBUG_INTERNAL_REFS, + "%d delete ref %d desc %d for node %d\n", + ref->proc->pid, ref->data.debug_id, ref->data.desc, + ref->node->debug_id); + + rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc); + rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node); + + binder_node_inner_lock(ref->node); + if (ref->data.strong) + binder_dec_node_nilocked(ref->node, 1, 1); + + hlist_del(&ref->node_entry); + delete_node = binder_dec_node_nilocked(ref->node, 0, 1); + binder_node_inner_unlock(ref->node); + /* + * Clear ref->node unless we want the caller to free the node + */ + if (!delete_node) { + /* + * The caller uses ref->node to determine + * whether the node needs to be freed. Clear + * it since the node is still alive. + */ + ref->node = NULL; + } + + if (ref->death) { + binder_debug(BINDER_DEBUG_DEAD_BINDER, + "%d delete ref %d desc %d has death notification\n", + ref->proc->pid, ref->data.debug_id, + ref->data.desc); + binder_dequeue_work(ref->proc, &ref->death->work); + binder_stats_deleted(BINDER_STAT_DEATH); + } + binder_stats_deleted(BINDER_STAT_REF); +} + +/** + * binder_inc_ref_olocked() - increment the ref for given handle + * @ref: ref to be incremented + * @strong: if true, strong increment, else weak + * @target_list: list to queue node work on + * + * Increment the ref. @ref->proc->outer_lock must be held on entry + * + * Return: 0, if successful, else errno + */ +static int binder_inc_ref_olocked(struct binder_ref *ref, int strong, + struct list_head *target_list) +{ + int ret; + + if (strong) { + if (ref->data.strong == 0) { + ret = binder_inc_node(ref->node, 1, 1, target_list); + if (ret) + return ret; + } + ref->data.strong++; + } else { + if (ref->data.weak == 0) { + ret = binder_inc_node(ref->node, 0, 1, target_list); + if (ret) + return ret; + } + ref->data.weak++; + } + return 0; +} + +/** + * binder_dec_ref() - dec the ref for given handle + * @ref: ref to be decremented + * @strong: if true, strong decrement, else weak + * + * Decrement the ref. + * + * Return: true if ref is cleaned up and ready to be freed + */ +static bool binder_dec_ref_olocked(struct binder_ref *ref, int strong) +{ + if (strong) { + if (ref->data.strong == 0) { + binder_user_error("%d invalid dec strong, ref %d desc %d s %d w %d\n", + ref->proc->pid, ref->data.debug_id, + ref->data.desc, ref->data.strong, + ref->data.weak); + return false; + } + ref->data.strong--; + if (ref->data.strong == 0) + binder_dec_node(ref->node, strong, 1); + } else { + if (ref->data.weak == 0) { + binder_user_error("%d invalid dec weak, ref %d desc %d s %d w %d\n", + ref->proc->pid, ref->data.debug_id, + ref->data.desc, ref->data.strong, + ref->data.weak); + return false; + } + ref->data.weak--; + } + if (ref->data.strong == 0 && ref->data.weak == 0) { + binder_cleanup_ref_olocked(ref); + return true; + } + return false; +} + +/** + * binder_get_node_from_ref() - get the node from the given proc/desc + * @proc: proc containing the ref + * @desc: the handle associated with the ref + * @need_strong_ref: if true, only return node if ref is strong + * @rdata: the id/refcount data for the ref + * + * Given a proc and ref handle, return the associated binder_node + * + * Return: a binder_node or NULL if not found or not strong when strong required + */ +static struct binder_node *binder_get_node_from_ref( + struct binder_proc *proc, + u32 desc, bool need_strong_ref, + struct binder_ref_data *rdata) +{ + struct binder_node *node; + struct binder_ref *ref; + + binder_proc_lock(proc); + ref = binder_get_ref_olocked(proc, desc, need_strong_ref); + if (!ref) + goto err_no_ref; + node = ref->node; + /* + * Take an implicit reference on the node to ensure + * it stays alive until the call to binder_put_node() + */ + binder_inc_node_tmpref(node); + if (rdata) + *rdata = ref->data; + binder_proc_unlock(proc); + + return node; + +err_no_ref: + binder_proc_unlock(proc); + return NULL; +} + +/** + * binder_free_ref() - free the binder_ref + * @ref: ref to free + * + * Free the binder_ref. Free the binder_node indicated by ref->node + * (if non-NULL) and the binder_ref_death indicated by ref->death. + */ +static void binder_free_ref(struct binder_ref *ref) +{ + if (ref->node) + binder_free_node(ref->node); + kfree(ref->death); + kfree(ref); +} + +/** + * binder_update_ref_for_handle() - inc/dec the ref for given handle + * @proc: proc containing the ref + * @desc: the handle associated with the ref + * @increment: true=inc reference, false=dec reference + * @strong: true=strong reference, false=weak reference + * @rdata: the id/refcount data for the ref + * + * Given a proc and ref handle, increment or decrement the ref + * according to "increment" arg. + * + * Return: 0 if successful, else errno + */ +static int binder_update_ref_for_handle(struct binder_proc *proc, + uint32_t desc, bool increment, bool strong, + struct binder_ref_data *rdata) +{ + int ret = 0; + struct binder_ref *ref; + bool delete_ref = false; + + binder_proc_lock(proc); + ref = binder_get_ref_olocked(proc, desc, strong); + if (!ref) { + ret = -EINVAL; + goto err_no_ref; + } + if (increment) + ret = binder_inc_ref_olocked(ref, strong, NULL); + else + delete_ref = binder_dec_ref_olocked(ref, strong); + + if (rdata) + *rdata = ref->data; + binder_proc_unlock(proc); + + if (delete_ref) + binder_free_ref(ref); + return ret; + +err_no_ref: + binder_proc_unlock(proc); + return ret; +} + +/** + * binder_dec_ref_for_handle() - dec the ref for given handle + * @proc: proc containing the ref + * @desc: the handle associated with the ref + * @strong: true=strong reference, false=weak reference + * @rdata: the id/refcount data for the ref + * + * Just calls binder_update_ref_for_handle() to decrement the ref. + * + * Return: 0 if successful, else errno + */ +static int binder_dec_ref_for_handle(struct binder_proc *proc, + uint32_t desc, bool strong, struct binder_ref_data *rdata) +{ + return binder_update_ref_for_handle(proc, desc, false, strong, rdata); +} + + +/** + * binder_inc_ref_for_node() - increment the ref for given proc/node + * @proc: proc containing the ref + * @node: target node + * @strong: true=strong reference, false=weak reference + * @target_list: worklist to use if node is incremented + * @rdata: the id/refcount data for the ref + * + * Given a proc and node, increment the ref. Create the ref if it + * doesn't already exist + * + * Return: 0 if successful, else errno + */ +static int binder_inc_ref_for_node(struct binder_proc *proc, + struct binder_node *node, + bool strong, + struct list_head *target_list, + struct binder_ref_data *rdata) +{ + struct binder_ref *ref; + struct binder_ref *new_ref = NULL; + int ret = 0; + + binder_proc_lock(proc); + ref = binder_get_ref_for_node_olocked(proc, node, NULL); + if (!ref) { + binder_proc_unlock(proc); + new_ref = kzalloc(sizeof(*ref), GFP_KERNEL); + if (!new_ref) + return -ENOMEM; + binder_proc_lock(proc); + ref = binder_get_ref_for_node_olocked(proc, node, new_ref); + } + ret = binder_inc_ref_olocked(ref, strong, target_list); + *rdata = ref->data; + binder_proc_unlock(proc); + if (new_ref && ref != new_ref) + /* + * Another thread created the ref first so + * free the one we allocated + */ + kfree(new_ref); + return ret; +} + +static void binder_pop_transaction_ilocked(struct binder_thread *target_thread, + struct binder_transaction *t) +{ + BUG_ON(!target_thread); + assert_spin_locked(&target_thread->proc->inner_lock); + BUG_ON(target_thread->transaction_stack != t); + BUG_ON(target_thread->transaction_stack->from != target_thread); + target_thread->transaction_stack = + target_thread->transaction_stack->from_parent; + t->from = NULL; +} + +/** + * binder_thread_dec_tmpref() - decrement thread->tmp_ref + * @thread: thread to decrement + * + * A thread needs to be kept alive while being used to create or + * handle a transaction. binder_get_txn_from() is used to safely + * extract t->from from a binder_transaction and keep the thread + * indicated by t->from from being freed. When done with that + * binder_thread, this function is called to decrement the + * tmp_ref and free if appropriate (thread has been released + * and no transaction being processed by the driver) + */ +static void binder_thread_dec_tmpref(struct binder_thread *thread) +{ + /* + * atomic is used to protect the counter value while + * it cannot reach zero or thread->is_dead is false + */ + binder_inner_proc_lock(thread->proc); + atomic_dec(&thread->tmp_ref); + if (thread->is_dead && !atomic_read(&thread->tmp_ref)) { + binder_inner_proc_unlock(thread->proc); + binder_free_thread(thread); + return; + } + binder_inner_proc_unlock(thread->proc); +} + +/** + * binder_proc_dec_tmpref() - decrement proc->tmp_ref + * @proc: proc to decrement + * + * A binder_proc needs to be kept alive while being used to create or + * handle a transaction. proc->tmp_ref is incremented when + * creating a new transaction or the binder_proc is currently in-use + * by threads that are being released. When done with the binder_proc, + * this function is called to decrement the counter and free the + * proc if appropriate (proc has been released, all threads have + * been released and not currenly in-use to process a transaction). + */ +static void binder_proc_dec_tmpref(struct binder_proc *proc) +{ + binder_inner_proc_lock(proc); + proc->tmp_ref--; + if (proc->is_dead && RB_EMPTY_ROOT(&proc->threads) && + !proc->tmp_ref) { + binder_inner_proc_unlock(proc); + binder_free_proc(proc); + return; + } + binder_inner_proc_unlock(proc); +} + +/** + * binder_get_txn_from() - safely extract the "from" thread in transaction + * @t: binder transaction for t->from + * + * Atomically return the "from" thread and increment the tmp_ref + * count for the thread to ensure it stays alive until + * binder_thread_dec_tmpref() is called. + * + * Return: the value of t->from + */ +static struct binder_thread *binder_get_txn_from( + struct binder_transaction *t) +{ + struct binder_thread *from; + + spin_lock(&t->lock); + from = t->from; + if (from) + atomic_inc(&from->tmp_ref); + spin_unlock(&t->lock); + return from; +} + +/** + * binder_get_txn_from_and_acq_inner() - get t->from and acquire inner lock + * @t: binder transaction for t->from + * + * Same as binder_get_txn_from() except it also acquires the proc->inner_lock + * to guarantee that the thread cannot be released while operating on it. + * The caller must call binder_inner_proc_unlock() to release the inner lock + * as well as call binder_dec_thread_txn() to release the reference. + * + * Return: the value of t->from + */ +static struct binder_thread *binder_get_txn_from_and_acq_inner( + struct binder_transaction *t) +{ + struct binder_thread *from; + + from = binder_get_txn_from(t); + if (!from) + return NULL; + binder_inner_proc_lock(from->proc); + if (t->from) { + BUG_ON(from != t->from); + return from; + } + binder_inner_proc_unlock(from->proc); + binder_thread_dec_tmpref(from); + return NULL; +} + +static void binder_free_transaction(struct binder_transaction *t) +{ + struct binder_proc *target_proc = t->to_proc; + + if (target_proc) { + binder_inner_proc_lock(target_proc); + if (t->buffer) + t->buffer->transaction = NULL; + binder_inner_proc_unlock(target_proc); + } + /* + * If the transaction has no target_proc, then + * t->buffer->transaction has already been cleared. + */ + kfree(t); + binder_stats_deleted(BINDER_STAT_TRANSACTION); +} + +static void binder_send_failed_reply(struct binder_transaction *t, + uint32_t error_code) +{ + struct binder_thread *target_thread; + struct binder_transaction *next; + + BUG_ON(t->flags & TF_ONE_WAY); + while (1) { + target_thread = binder_get_txn_from_and_acq_inner(t); + if (target_thread) { + binder_debug(BINDER_DEBUG_FAILED_TRANSACTION, + "send failed reply for transaction %d to %d:%d\n", + t->debug_id, + target_thread->proc->pid, + target_thread->pid); + + binder_pop_transaction_ilocked(target_thread, t); + if (target_thread->reply_error.cmd == BR_OK) { + target_thread->reply_error.cmd = error_code; + binder_enqueue_thread_work_ilocked( + target_thread, + &target_thread->reply_error.work); + wake_up_interruptible(&target_thread->wait); + } else { + /* + * Cannot get here for normal operation, but + * we can if multiple synchronous transactions + * are sent without blocking for responses. + * Just ignore the 2nd error in this case. + */ + pr_warn("Unexpected reply error: %u\n", + target_thread->reply_error.cmd); + } + binder_inner_proc_unlock(target_thread->proc); + binder_thread_dec_tmpref(target_thread); + binder_free_transaction(t); + return; + } + next = t->from_parent; + + binder_debug(BINDER_DEBUG_FAILED_TRANSACTION, + "send failed reply for transaction %d, target dead\n", + t->debug_id); + + binder_free_transaction(t); + if (next == NULL) { + binder_debug(BINDER_DEBUG_DEAD_BINDER, + "reply failed, no target thread at root\n"); + return; + } + t = next; + binder_debug(BINDER_DEBUG_DEAD_BINDER, + "reply failed, no target thread -- retry %d\n", + t->debug_id); + } +} + +/** + * binder_cleanup_transaction() - cleans up undelivered transaction + * @t: transaction that needs to be cleaned up + * @reason: reason the transaction wasn't delivered + * @error_code: error to return to caller (if synchronous call) + */ +static void binder_cleanup_transaction(struct binder_transaction *t, + const char *reason, + uint32_t error_code) +{ + if (t->buffer->target_node && !(t->flags & TF_ONE_WAY)) { + binder_send_failed_reply(t, error_code); + } else { + binder_debug(BINDER_DEBUG_DEAD_TRANSACTION, + "undelivered transaction %d, %s\n", + t->debug_id, reason); + binder_free_transaction(t); + } +} + +/** + * binder_validate_object() - checks for a valid metadata object in a buffer. + * @buffer: binder_buffer that we're parsing. + * @offset: offset in the buffer at which to validate an object. + * + * Return: If there's a valid metadata object at @offset in @buffer, the + * size of that object. Otherwise, it returns zero. + */ +static size_t binder_validate_object(struct binder_buffer *buffer, u64 offset) +{ + /* Check if we can read a header first */ + struct binder_object_header *hdr; + size_t object_size = 0; + + if (buffer->data_size < sizeof(*hdr) || + offset > buffer->data_size - sizeof(*hdr) || + !IS_ALIGNED(offset, sizeof(u32))) + return 0; + + /* Ok, now see if we can read a complete object. */ + hdr = (struct binder_object_header *)(buffer->data + offset); + switch (hdr->type) { + case BINDER_TYPE_BINDER: + case BINDER_TYPE_WEAK_BINDER: + case BINDER_TYPE_HANDLE: + case BINDER_TYPE_WEAK_HANDLE: + object_size = sizeof(struct flat_binder_object); + break; + case BINDER_TYPE_FD: + object_size = sizeof(struct binder_fd_object); + break; + case BINDER_TYPE_PTR: + object_size = sizeof(struct binder_buffer_object); + break; + case BINDER_TYPE_FDA: + object_size = sizeof(struct binder_fd_array_object); + break; + default: + return 0; + } + if (offset <= buffer->data_size - object_size && + buffer->data_size >= object_size) + return object_size; + else + return 0; +} + +/** + * binder_validate_ptr() - validates binder_buffer_object in a binder_buffer. + * @b: binder_buffer containing the object + * @index: index in offset array at which the binder_buffer_object is + * located + * @start: points to the start of the offset array + * @num_valid: the number of valid offsets in the offset array + * + * Return: If @index is within the valid range of the offset array + * described by @start and @num_valid, and if there's a valid + * binder_buffer_object at the offset found in index @index + * of the offset array, that object is returned. Otherwise, + * %NULL is returned. + * Note that the offset found in index @index itself is not + * verified; this function assumes that @num_valid elements + * from @start were previously verified to have valid offsets. + */ +static struct binder_buffer_object *binder_validate_ptr(struct binder_buffer *b, + binder_size_t index, + binder_size_t *start, + binder_size_t num_valid) +{ + struct binder_buffer_object *buffer_obj; + binder_size_t *offp; + + if (index >= num_valid) + return NULL; + + offp = start + index; + buffer_obj = (struct binder_buffer_object *)(b->data + *offp); + if (buffer_obj->hdr.type != BINDER_TYPE_PTR) + return NULL; + + return buffer_obj; +} + +/** + * binder_validate_fixup() - validates pointer/fd fixups happen in order. + * @b: transaction buffer + * @objects_start start of objects buffer + * @buffer: binder_buffer_object in which to fix up + * @offset: start offset in @buffer to fix up + * @last_obj: last binder_buffer_object that we fixed up in + * @last_min_offset: minimum fixup offset in @last_obj + * + * Return: %true if a fixup in buffer @buffer at offset @offset is + * allowed. + * + * For safety reasons, we only allow fixups inside a buffer to happen + * at increasing offsets; additionally, we only allow fixup on the last + * buffer object that was verified, or one of its parents. + * + * Example of what is allowed: + * + * A + * B (parent = A, offset = 0) + * C (parent = A, offset = 16) + * D (parent = C, offset = 0) + * E (parent = A, offset = 32) // min_offset is 16 (C.parent_offset) + * + * Examples of what is not allowed: + * + * Decreasing offsets within the same parent: + * A + * C (parent = A, offset = 16) + * B (parent = A, offset = 0) // decreasing offset within A + * + * Referring to a parent that wasn't the last object or any of its parents: + * A + * B (parent = A, offset = 0) + * C (parent = A, offset = 0) + * C (parent = A, offset = 16) + * D (parent = B, offset = 0) // B is not A or any of A's parents + */ +static bool binder_validate_fixup(struct binder_buffer *b, + binder_size_t *objects_start, + struct binder_buffer_object *buffer, + binder_size_t fixup_offset, + struct binder_buffer_object *last_obj, + binder_size_t last_min_offset) +{ + if (!last_obj) { + /* Nothing to fix up in */ + return false; + } + + while (last_obj != buffer) { + /* + * Safe to retrieve the parent of last_obj, since it + * was already previously verified by the driver. + */ + if ((last_obj->flags & BINDER_BUFFER_FLAG_HAS_PARENT) == 0) + return false; + last_min_offset = last_obj->parent_offset + sizeof(uintptr_t); + last_obj = (struct binder_buffer_object *) + (b->data + *(objects_start + last_obj->parent)); + } + return (fixup_offset >= last_min_offset); +} + +static void binder_transaction_buffer_release(struct binder_proc *proc, + struct binder_buffer *buffer, + binder_size_t *failed_at) +{ + binder_size_t *offp, *off_start, *off_end; + int debug_id = buffer->debug_id; + + binder_debug(BINDER_DEBUG_TRANSACTION, + "%d buffer release %d, size %zd-%zd, failed at %pK\n", + proc->pid, buffer->debug_id, + buffer->data_size, buffer->offsets_size, failed_at); + + if (buffer->target_node) + binder_dec_node(buffer->target_node, 1, 0); + + off_start = (binder_size_t *)(buffer->data + + ALIGN(buffer->data_size, sizeof(void *))); + if (failed_at) + off_end = failed_at; + else + off_end = (void *)off_start + buffer->offsets_size; + for (offp = off_start; offp < off_end; offp++) { + struct binder_object_header *hdr; + size_t object_size = binder_validate_object(buffer, *offp); + + if (object_size == 0) { + pr_err("transaction release %d bad object at offset %lld, size %zd\n", + debug_id, (u64)*offp, buffer->data_size); + continue; + } + hdr = (struct binder_object_header *)(buffer->data + *offp); + switch (hdr->type) { + case BINDER_TYPE_BINDER: + case BINDER_TYPE_WEAK_BINDER: { + struct flat_binder_object *fp; + struct binder_node *node; + + fp = to_flat_binder_object(hdr); + node = binder_get_node(proc, fp->binder); + if (node == NULL) { + pr_err("transaction release %d bad node %016llx\n", + debug_id, (u64)fp->binder); + break; + } + binder_debug(BINDER_DEBUG_TRANSACTION, + " node %d u%016llx\n", + node->debug_id, (u64)node->ptr); + binder_dec_node(node, hdr->type == BINDER_TYPE_BINDER, + 0); + binder_put_node(node); + } break; + case BINDER_TYPE_HANDLE: + case BINDER_TYPE_WEAK_HANDLE: { + struct flat_binder_object *fp; + struct binder_ref_data rdata; + int ret; + + fp = to_flat_binder_object(hdr); + ret = binder_dec_ref_for_handle(proc, fp->handle, + hdr->type == BINDER_TYPE_HANDLE, &rdata); + + if (ret) { + pr_err("transaction release %d bad handle %d, ret = %d\n", + debug_id, fp->handle, ret); + break; + } + binder_debug(BINDER_DEBUG_TRANSACTION, + " ref %d desc %d\n", + rdata.debug_id, rdata.desc); + } break; + + case BINDER_TYPE_FD: { + struct binder_fd_object *fp = to_binder_fd_object(hdr); + + binder_debug(BINDER_DEBUG_TRANSACTION, + " fd %d\n", fp->fd); + if (failed_at) + task_close_fd(proc, fp->fd); + } break; + case BINDER_TYPE_PTR: + /* + * Nothing to do here, this will get cleaned up when the + * transaction buffer gets freed + */ + break; + case BINDER_TYPE_FDA: { + struct binder_fd_array_object *fda; + struct binder_buffer_object *parent; + uintptr_t parent_buffer; + u32 *fd_array; + size_t fd_index; + binder_size_t fd_buf_size; + + fda = to_binder_fd_array_object(hdr); + parent = binder_validate_ptr(buffer, fda->parent, + off_start, + offp - off_start); + if (!parent) { + pr_err("transaction release %d bad parent offset\n", + debug_id); + continue; + } + /* + * Since the parent was already fixed up, convert it + * back to kernel address space to access it + */ + parent_buffer = parent->buffer - + binder_alloc_get_user_buffer_offset( + &proc->alloc); + + fd_buf_size = sizeof(u32) * fda->num_fds; + if (fda->num_fds >= SIZE_MAX / sizeof(u32)) { + pr_err("transaction release %d invalid number of fds (%lld)\n", + debug_id, (u64)fda->num_fds); + continue; + } + if (fd_buf_size > parent->length || + fda->parent_offset > parent->length - fd_buf_size) { + /* No space for all file descriptors here. */ + pr_err("transaction release %d not enough space for %lld fds in buffer\n", + debug_id, (u64)fda->num_fds); + continue; + } + fd_array = (u32 *)(parent_buffer + (uintptr_t)fda->parent_offset); + for (fd_index = 0; fd_index < fda->num_fds; fd_index++) + task_close_fd(proc, fd_array[fd_index]); + } break; + default: + pr_err("transaction release %d bad object type %x\n", + debug_id, hdr->type); + break; + } + } +} + +static int binder_translate_binder(struct flat_binder_object *fp, + struct binder_transaction *t, + struct binder_thread *thread) +{ + struct binder_node *node; + struct binder_proc *proc = thread->proc; + struct binder_proc *target_proc = t->to_proc; + struct binder_ref_data rdata; + int ret = 0; + + node = binder_get_node(proc, fp->binder); + if (!node) { + node = binder_new_node(proc, fp); + if (!node) + return -ENOMEM; + } + if (fp->cookie != node->cookie) { + binder_user_error("%d:%d sending u%016llx node %d, cookie mismatch %016llx != %016llx\n", + proc->pid, thread->pid, (u64)fp->binder, + node->debug_id, (u64)fp->cookie, + (u64)node->cookie); + ret = -EINVAL; + goto done; + } + if (security_binder_transfer_binder(proc->cred, target_proc->cred)) { + ret = -EPERM; + goto done; + } + + ret = binder_inc_ref_for_node(target_proc, node, + fp->hdr.type == BINDER_TYPE_BINDER, + &thread->todo, &rdata); + if (ret) + goto done; + + if (fp->hdr.type == BINDER_TYPE_BINDER) + fp->hdr.type = BINDER_TYPE_HANDLE; + else + fp->hdr.type = BINDER_TYPE_WEAK_HANDLE; + fp->binder = 0; + fp->handle = rdata.desc; + fp->cookie = 0; + + trace_binder_transaction_node_to_ref(t, node, &rdata); + binder_debug(BINDER_DEBUG_TRANSACTION, + " node %d u%016llx -> ref %d desc %d\n", + node->debug_id, (u64)node->ptr, + rdata.debug_id, rdata.desc); +done: + binder_put_node(node); + return ret; +} + +static int binder_translate_handle(struct flat_binder_object *fp, + struct binder_transaction *t, + struct binder_thread *thread) +{ + struct binder_proc *proc = thread->proc; + struct binder_proc *target_proc = t->to_proc; + struct binder_node *node; + struct binder_ref_data src_rdata; + int ret = 0; + + node = binder_get_node_from_ref(proc, fp->handle, + fp->hdr.type == BINDER_TYPE_HANDLE, &src_rdata); + if (!node) { + binder_user_error("%d:%d got transaction with invalid handle, %d\n", + proc->pid, thread->pid, fp->handle); + return -EINVAL; + } + if (security_binder_transfer_binder(proc->cred, target_proc->cred)) { + ret = -EPERM; + goto done; + } + + binder_node_lock(node); + if (node->proc == target_proc) { + if (fp->hdr.type == BINDER_TYPE_HANDLE) + fp->hdr.type = BINDER_TYPE_BINDER; + else + fp->hdr.type = BINDER_TYPE_WEAK_BINDER; + fp->binder = node->ptr; + fp->cookie = node->cookie; + if (node->proc) + binder_inner_proc_lock(node->proc); + binder_inc_node_nilocked(node, + fp->hdr.type == BINDER_TYPE_BINDER, + 0, NULL); + if (node->proc) + binder_inner_proc_unlock(node->proc); + trace_binder_transaction_ref_to_node(t, node, &src_rdata); + binder_debug(BINDER_DEBUG_TRANSACTION, + " ref %d desc %d -> node %d u%016llx\n", + src_rdata.debug_id, src_rdata.desc, node->debug_id, + (u64)node->ptr); + binder_node_unlock(node); + } else { + struct binder_ref_data dest_rdata; + + binder_node_unlock(node); + ret = binder_inc_ref_for_node(target_proc, node, + fp->hdr.type == BINDER_TYPE_HANDLE, + NULL, &dest_rdata); + if (ret) + goto done; + + fp->binder = 0; + fp->handle = dest_rdata.desc; + fp->cookie = 0; + trace_binder_transaction_ref_to_ref(t, node, &src_rdata, + &dest_rdata); + binder_debug(BINDER_DEBUG_TRANSACTION, + " ref %d desc %d -> ref %d desc %d (node %d)\n", + src_rdata.debug_id, src_rdata.desc, + dest_rdata.debug_id, dest_rdata.desc, + node->debug_id); + } +done: + binder_put_node(node); + return ret; +} + +static int binder_translate_fd(int fd, + struct binder_transaction *t, + struct binder_thread *thread, + struct binder_transaction *in_reply_to) +{ + struct binder_proc *proc = thread->proc; + struct binder_proc *target_proc = t->to_proc; + int target_fd; + struct file *file; + int ret; + bool target_allows_fd; + + if (in_reply_to) + target_allows_fd = !!(in_reply_to->flags & TF_ACCEPT_FDS); + else + target_allows_fd = t->buffer->target_node->accept_fds; + if (!target_allows_fd) { + binder_user_error("%d:%d got %s with fd, %d, but target does not allow fds\n", + proc->pid, thread->pid, + in_reply_to ? "reply" : "transaction", + fd); + ret = -EPERM; + goto err_fd_not_accepted; + } + + file = fget(fd); + if (!file) { + binder_user_error("%d:%d got transaction with invalid fd, %d\n", + proc->pid, thread->pid, fd); + ret = -EBADF; + goto err_fget; + } + ret = security_binder_transfer_file(proc->cred, target_proc->cred, file); + if (ret < 0) { + ret = -EPERM; + goto err_security; + } + + target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC); + if (target_fd < 0) { + ret = -ENOMEM; + goto err_get_unused_fd; + } + task_fd_install(target_proc, target_fd, file); + trace_binder_transaction_fd(t, fd, target_fd); + binder_debug(BINDER_DEBUG_TRANSACTION, " fd %d -> %d\n", + fd, target_fd); + + return target_fd; + +err_get_unused_fd: +err_security: + fput(file); +err_fget: +err_fd_not_accepted: + return ret; +} + +static int binder_translate_fd_array(struct binder_fd_array_object *fda, + struct binder_buffer_object *parent, + struct binder_transaction *t, + struct binder_thread *thread, + struct binder_transaction *in_reply_to) +{ + binder_size_t fdi, fd_buf_size, num_installed_fds; + int target_fd; + uintptr_t parent_buffer; + u32 *fd_array; + struct binder_proc *proc = thread->proc; + struct binder_proc *target_proc = t->to_proc; + + fd_buf_size = sizeof(u32) * fda->num_fds; + if (fda->num_fds >= SIZE_MAX / sizeof(u32)) { + binder_user_error("%d:%d got transaction with invalid number of fds (%lld)\n", + proc->pid, thread->pid, (u64)fda->num_fds); + return -EINVAL; + } + if (fd_buf_size > parent->length || + fda->parent_offset > parent->length - fd_buf_size) { + /* No space for all file descriptors here. */ + binder_user_error("%d:%d not enough space to store %lld fds in buffer\n", + proc->pid, thread->pid, (u64)fda->num_fds); + return -EINVAL; + } + /* + * Since the parent was already fixed up, convert it + * back to the kernel address space to access it + */ + parent_buffer = parent->buffer - + binder_alloc_get_user_buffer_offset(&target_proc->alloc); + fd_array = (u32 *)(parent_buffer + (uintptr_t)fda->parent_offset); + if (!IS_ALIGNED((unsigned long)fd_array, sizeof(u32))) { + binder_user_error("%d:%d parent offset not aligned correctly.\n", + proc->pid, thread->pid); + return -EINVAL; + } + for (fdi = 0; fdi < fda->num_fds; fdi++) { + target_fd = binder_translate_fd(fd_array[fdi], t, thread, + in_reply_to); + if (target_fd < 0) + goto err_translate_fd_failed; + fd_array[fdi] = target_fd; + } + return 0; + +err_translate_fd_failed: + /* + * Failed to allocate fd or security error, free fds + * installed so far. + */ + num_installed_fds = fdi; + for (fdi = 0; fdi < num_installed_fds; fdi++) + task_close_fd(target_proc, fd_array[fdi]); + return target_fd; +} + +static int binder_fixup_parent(struct binder_transaction *t, + struct binder_thread *thread, + struct binder_buffer_object *bp, + binder_size_t *off_start, + binder_size_t num_valid, + struct binder_buffer_object *last_fixup_obj, + binder_size_t last_fixup_min_off) +{ + struct binder_buffer_object *parent; + u8 *parent_buffer; + struct binder_buffer *b = t->buffer; + struct binder_proc *proc = thread->proc; + struct binder_proc *target_proc = t->to_proc; + + if (!(bp->flags & BINDER_BUFFER_FLAG_HAS_PARENT)) + return 0; + + parent = binder_validate_ptr(b, bp->parent, off_start, num_valid); + if (!parent) { + binder_user_error("%d:%d got transaction with invalid parent offset or type\n", + proc->pid, thread->pid); + return -EINVAL; + } + + if (!binder_validate_fixup(b, off_start, + parent, bp->parent_offset, + last_fixup_obj, + last_fixup_min_off)) { + binder_user_error("%d:%d got transaction with out-of-order buffer fixup\n", + proc->pid, thread->pid); + return -EINVAL; + } + + if (parent->length < sizeof(binder_uintptr_t) || + bp->parent_offset > parent->length - sizeof(binder_uintptr_t)) { + /* No space for a pointer here! */ + binder_user_error("%d:%d got transaction with invalid parent offset\n", + proc->pid, thread->pid); + return -EINVAL; + } + parent_buffer = (u8 *)((uintptr_t)parent->buffer - + binder_alloc_get_user_buffer_offset( + &target_proc->alloc)); + *(binder_uintptr_t *)(parent_buffer + bp->parent_offset) = bp->buffer; + + return 0; +} + +/** + * binder_proc_transaction() - sends a transaction to a process and wakes it up + * @t: transaction to send + * @proc: process to send the transaction to + * @thread: thread in @proc to send the transaction to (may be NULL) + * + * This function queues a transaction to the specified process. It will try + * to find a thread in the target process to handle the transaction and + * wake it up. If no thread is found, the work is queued to the proc + * waitqueue. + * + * If the @thread parameter is not NULL, the transaction is always queued + * to the waitlist of that specific thread. + * + * Return: true if the transactions was successfully queued + * false if the target process or thread is dead + */ +static bool binder_proc_transaction(struct binder_transaction *t, + struct binder_proc *proc, + struct binder_thread *thread) +{ + struct binder_node *node = t->buffer->target_node; + bool oneway = !!(t->flags & TF_ONE_WAY); + bool pending_async = false; + + BUG_ON(!node); + binder_node_lock(node); + if (oneway) { + BUG_ON(thread); + if (node->has_async_transaction) { + pending_async = true; + } else { + node->has_async_transaction = true; + } + } + + binder_inner_proc_lock(proc); + + if (proc->is_dead || (thread && thread->is_dead)) { + binder_inner_proc_unlock(proc); + binder_node_unlock(node); + return false; + } + + if (!thread && !pending_async) + thread = binder_select_thread_ilocked(proc); + + if (thread) + binder_enqueue_thread_work_ilocked(thread, &t->work); + else if (!pending_async) + binder_enqueue_work_ilocked(&t->work, &proc->todo); + else + binder_enqueue_work_ilocked(&t->work, &node->async_todo); + + if (!pending_async) + binder_wakeup_thread_ilocked(proc, thread, !oneway /* sync */); + + binder_inner_proc_unlock(proc); + binder_node_unlock(node); + + return true; +} + +/** + * binder_get_node_refs_for_txn() - Get required refs on node for txn + * @node: struct binder_node for which to get refs + * @proc: returns @node->proc if valid + * @error: if no @proc then returns BR_DEAD_REPLY + * + * User-space normally keeps the node alive when creating a transaction + * since it has a reference to the target. The local strong ref keeps it + * alive if the sending process dies before the target process processes + * the transaction. If the source process is malicious or has a reference + * counting bug, relying on the local strong ref can fail. + * + * Since user-space can cause the local strong ref to go away, we also take + * a tmpref on the node to ensure it survives while we are constructing + * the transaction. We also need a tmpref on the proc while we are + * constructing the transaction, so we take that here as well. + * + * Return: The target_node with refs taken or NULL if no @node->proc is NULL. + * Also sets @proc if valid. If the @node->proc is NULL indicating that the + * target proc has died, @error is set to BR_DEAD_REPLY + */ +static struct binder_node *binder_get_node_refs_for_txn( + struct binder_node *node, + struct binder_proc **procp, + uint32_t *error) +{ + struct binder_node *target_node = NULL; + + binder_node_inner_lock(node); + if (node->proc) { + target_node = node; + binder_inc_node_nilocked(node, 1, 0, NULL); + binder_inc_node_tmpref_ilocked(node); + node->proc->tmp_ref++; + *procp = node->proc; + } else + *error = BR_DEAD_REPLY; + binder_node_inner_unlock(node); + + return target_node; +} + +static void binder_transaction(struct binder_proc *proc, + struct binder_thread *thread, + struct binder_transaction_data *tr, int reply, + binder_size_t extra_buffers_size) +{ + int ret; + struct binder_transaction *t; + struct binder_work *w; + struct binder_work *tcomplete; + binder_size_t *offp, *off_end, *off_start; + binder_size_t off_min; + u8 *sg_bufp, *sg_buf_end; + struct binder_proc *target_proc = NULL; + struct binder_thread *target_thread = NULL; + struct binder_node *target_node = NULL; + struct binder_transaction *in_reply_to = NULL; + struct binder_transaction_log_entry *e; + uint32_t return_error = 0; + uint32_t return_error_param = 0; + uint32_t return_error_line = 0; + struct binder_buffer_object *last_fixup_obj = NULL; + binder_size_t last_fixup_min_off = 0; + struct binder_context *context = proc->context; + int t_debug_id = atomic_inc_return(&binder_last_id); + + e = binder_transaction_log_add(&binder_transaction_log); + e->debug_id = t_debug_id; + e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY); + e->from_proc = proc->pid; + e->from_thread = thread->pid; + e->target_handle = tr->target.handle; + e->data_size = tr->data_size; + e->offsets_size = tr->offsets_size; + e->context_name = proc->context->name; + + if (reply) { + binder_inner_proc_lock(proc); + in_reply_to = thread->transaction_stack; + if (in_reply_to == NULL) { + binder_inner_proc_unlock(proc); + binder_user_error("%d:%d got reply transaction with no transaction stack\n", + proc->pid, thread->pid); + return_error = BR_FAILED_REPLY; + return_error_param = -EPROTO; + return_error_line = __LINE__; + goto err_empty_call_stack; + } + if (in_reply_to->to_thread != thread) { + spin_lock(&in_reply_to->lock); + binder_user_error("%d:%d got reply transaction with bad transaction stack, transaction %d has target %d:%d\n", + proc->pid, thread->pid, in_reply_to->debug_id, + in_reply_to->to_proc ? + in_reply_to->to_proc->pid : 0, + in_reply_to->to_thread ? + in_reply_to->to_thread->pid : 0); + spin_unlock(&in_reply_to->lock); + binder_inner_proc_unlock(proc); + return_error = BR_FAILED_REPLY; + return_error_param = -EPROTO; + return_error_line = __LINE__; + in_reply_to = NULL; + goto err_bad_call_stack; + } + thread->transaction_stack = in_reply_to->to_parent; + binder_inner_proc_unlock(proc); + binder_set_nice(in_reply_to->saved_priority); + target_thread = binder_get_txn_from_and_acq_inner(in_reply_to); + if (target_thread == NULL) { + return_error = BR_DEAD_REPLY; + return_error_line = __LINE__; + goto err_dead_binder; + } + if (target_thread->transaction_stack != in_reply_to) { + binder_user_error("%d:%d got reply transaction with bad target transaction stack %d, expected %d\n", + proc->pid, thread->pid, + target_thread->transaction_stack ? + target_thread->transaction_stack->debug_id : 0, + in_reply_to->debug_id); + binder_inner_proc_unlock(target_thread->proc); + return_error = BR_FAILED_REPLY; + return_error_param = -EPROTO; + return_error_line = __LINE__; + in_reply_to = NULL; + target_thread = NULL; + goto err_dead_binder; + } + target_proc = target_thread->proc; + target_proc->tmp_ref++; + binder_inner_proc_unlock(target_thread->proc); + } else { + if (tr->target.handle) { + struct binder_ref *ref; + + /* + * There must already be a strong ref + * on this node. If so, do a strong + * increment on the node to ensure it + * stays alive until the transaction is + * done. + */ + binder_proc_lock(proc); + ref = binder_get_ref_olocked(proc, tr->target.handle, + true); + if (ref) { + target_node = binder_get_node_refs_for_txn( + ref->node, &target_proc, + &return_error); + } else { + binder_user_error("%d:%d got transaction to invalid handle\n", + proc->pid, thread->pid); + return_error = BR_FAILED_REPLY; + } + binder_proc_unlock(proc); + } else { + mutex_lock(&context->context_mgr_node_lock); + target_node = context->binder_context_mgr_node; + if (target_node) + target_node = binder_get_node_refs_for_txn( + target_node, &target_proc, + &return_error); + else + return_error = BR_DEAD_REPLY; + mutex_unlock(&context->context_mgr_node_lock); + if (target_node && target_proc->pid == proc->pid) { + binder_user_error("%d:%d got transaction to context manager from process owning it\n", + proc->pid, thread->pid); + return_error = BR_FAILED_REPLY; + return_error_param = -EINVAL; + return_error_line = __LINE__; + goto err_invalid_target_handle; + } + } + if (!target_node) { + /* + * return_error is set above + */ + return_error_param = -EINVAL; + return_error_line = __LINE__; + goto err_dead_binder; + } + e->to_node = target_node->debug_id; + if (WARN_ON(proc == target_proc)) { + return_error = BR_FAILED_REPLY; + return_error_param = -EINVAL; + return_error_line = __LINE__; + goto err_invalid_target_handle; + } + if (security_binder_transaction(proc->cred, + target_proc->cred) < 0) { + return_error = BR_FAILED_REPLY; + return_error_param = -EPERM; + return_error_line = __LINE__; + goto err_invalid_target_handle; + } + binder_inner_proc_lock(proc); + + w = list_first_entry_or_null(&thread->todo, + struct binder_work, entry); + if (!(tr->flags & TF_ONE_WAY) && w && + w->type == BINDER_WORK_TRANSACTION) { + /* + * Do not allow new outgoing transaction from a + * thread that has a transaction at the head of + * its todo list. Only need to check the head + * because binder_select_thread_ilocked picks a + * thread from proc->waiting_threads to enqueue + * the transaction, and nothing is queued to the + * todo list while the thread is on waiting_threads. + */ + binder_user_error("%d:%d new transaction not allowed when there is a transaction on thread todo\n", + proc->pid, thread->pid); + binder_inner_proc_unlock(proc); + return_error = BR_FAILED_REPLY; + return_error_param = -EPROTO; + return_error_line = __LINE__; + goto err_bad_todo_list; + } + + if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) { + struct binder_transaction *tmp; + + tmp = thread->transaction_stack; + if (tmp->to_thread != thread) { + spin_lock(&tmp->lock); + binder_user_error("%d:%d got new transaction with bad transaction stack, transaction %d has target %d:%d\n", + proc->pid, thread->pid, tmp->debug_id, + tmp->to_proc ? tmp->to_proc->pid : 0, + tmp->to_thread ? + tmp->to_thread->pid : 0); + spin_unlock(&tmp->lock); + binder_inner_proc_unlock(proc); + return_error = BR_FAILED_REPLY; + return_error_param = -EPROTO; + return_error_line = __LINE__; + goto err_bad_call_stack; + } + while (tmp) { + struct binder_thread *from; + + spin_lock(&tmp->lock); + from = tmp->from; + if (from && from->proc == target_proc) { + atomic_inc(&from->tmp_ref); + target_thread = from; + spin_unlock(&tmp->lock); + break; + } + spin_unlock(&tmp->lock); + tmp = tmp->from_parent; + } + } + binder_inner_proc_unlock(proc); + } + if (target_thread) + e->to_thread = target_thread->pid; + e->to_proc = target_proc->pid; + + /* TODO: reuse incoming transaction for reply */ + t = kzalloc(sizeof(*t), GFP_KERNEL); + if (t == NULL) { + return_error = BR_FAILED_REPLY; + return_error_param = -ENOMEM; + return_error_line = __LINE__; + goto err_alloc_t_failed; + } + binder_stats_created(BINDER_STAT_TRANSACTION); + spin_lock_init(&t->lock); + + tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL); + if (tcomplete == NULL) { + return_error = BR_FAILED_REPLY; + return_error_param = -ENOMEM; + return_error_line = __LINE__; + goto err_alloc_tcomplete_failed; + } + binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE); + + t->debug_id = t_debug_id; + + if (reply) + binder_debug(BINDER_DEBUG_TRANSACTION, + "%d:%d BC_REPLY %d -> %d:%d, data %016llx-%016llx size %lld-%lld-%lld\n", + proc->pid, thread->pid, t->debug_id, + target_proc->pid, target_thread->pid, + (u64)tr->data.ptr.buffer, + (u64)tr->data.ptr.offsets, + (u64)tr->data_size, (u64)tr->offsets_size, + (u64)extra_buffers_size); + else + binder_debug(BINDER_DEBUG_TRANSACTION, + "%d:%d BC_TRANSACTION %d -> %d - node %d, data %016llx-%016llx size %lld-%lld-%lld\n", + proc->pid, thread->pid, t->debug_id, + target_proc->pid, target_node->debug_id, + (u64)tr->data.ptr.buffer, + (u64)tr->data.ptr.offsets, + (u64)tr->data_size, (u64)tr->offsets_size, + (u64)extra_buffers_size); + + if (!reply && !(tr->flags & TF_ONE_WAY)) + t->from = thread; + else + t->from = NULL; + t->sender_euid = task_euid(proc->tsk); + t->to_proc = target_proc; + t->to_thread = target_thread; + t->code = tr->code; + t->flags = tr->flags; + t->priority = task_nice(current); + + trace_binder_transaction(reply, t, target_node); + + t->buffer = binder_alloc_new_buf(&target_proc->alloc, tr->data_size, + tr->offsets_size, extra_buffers_size, + !reply && (t->flags & TF_ONE_WAY)); + if (IS_ERR(t->buffer)) { + /* + * -ESRCH indicates VMA cleared. The target is dying. + */ + return_error_param = PTR_ERR(t->buffer); + return_error = return_error_param == -ESRCH ? + BR_DEAD_REPLY : BR_FAILED_REPLY; + return_error_line = __LINE__; + t->buffer = NULL; + goto err_binder_alloc_buf_failed; + } + t->buffer->debug_id = t->debug_id; + t->buffer->transaction = t; + t->buffer->target_node = target_node; + trace_binder_transaction_alloc_buf(t->buffer); + off_start = (binder_size_t *)(t->buffer->data + + ALIGN(tr->data_size, sizeof(void *))); + offp = off_start; + + if (copy_from_user(t->buffer->data, (const void __user *)(uintptr_t) + tr->data.ptr.buffer, tr->data_size)) { + binder_user_error("%d:%d got transaction with invalid data ptr\n", + proc->pid, thread->pid); + return_error = BR_FAILED_REPLY; + return_error_param = -EFAULT; + return_error_line = __LINE__; + goto err_copy_data_failed; + } + if (copy_from_user(offp, (const void __user *)(uintptr_t) + tr->data.ptr.offsets, tr->offsets_size)) { + binder_user_error("%d:%d got transaction with invalid offsets ptr\n", + proc->pid, thread->pid); + return_error = BR_FAILED_REPLY; + return_error_param = -EFAULT; + return_error_line = __LINE__; + goto err_copy_data_failed; + } + if (!IS_ALIGNED(tr->offsets_size, sizeof(binder_size_t))) { + binder_user_error("%d:%d got transaction with invalid offsets size, %lld\n", + proc->pid, thread->pid, (u64)tr->offsets_size); + return_error = BR_FAILED_REPLY; + return_error_param = -EINVAL; + return_error_line = __LINE__; + goto err_bad_offset; + } + if (!IS_ALIGNED(extra_buffers_size, sizeof(u64))) { + binder_user_error("%d:%d got transaction with unaligned buffers size, %lld\n", + proc->pid, thread->pid, + (u64)extra_buffers_size); + return_error = BR_FAILED_REPLY; + return_error_param = -EINVAL; + return_error_line = __LINE__; + goto err_bad_offset; + } + off_end = (void *)off_start + tr->offsets_size; + sg_bufp = (u8 *)(PTR_ALIGN(off_end, sizeof(void *))); + sg_buf_end = sg_bufp + extra_buffers_size; + off_min = 0; + for (; offp < off_end; offp++) { + struct binder_object_header *hdr; + size_t object_size = binder_validate_object(t->buffer, *offp); + + if (object_size == 0 || *offp < off_min) { + binder_user_error("%d:%d got transaction with invalid offset (%lld, min %lld max %lld) or object.\n", + proc->pid, thread->pid, (u64)*offp, + (u64)off_min, + (u64)t->buffer->data_size); + return_error = BR_FAILED_REPLY; + return_error_param = -EINVAL; + return_error_line = __LINE__; + goto err_bad_offset; + } + + hdr = (struct binder_object_header *)(t->buffer->data + *offp); + off_min = *offp + object_size; + switch (hdr->type) { + case BINDER_TYPE_BINDER: + case BINDER_TYPE_WEAK_BINDER: { + struct flat_binder_object *fp; + + fp = to_flat_binder_object(hdr); + ret = binder_translate_binder(fp, t, thread); + if (ret < 0) { + return_error = BR_FAILED_REPLY; + return_error_param = ret; + return_error_line = __LINE__; + goto err_translate_failed; + } + } break; + case BINDER_TYPE_HANDLE: + case BINDER_TYPE_WEAK_HANDLE: { + struct flat_binder_object *fp; + + fp = to_flat_binder_object(hdr); + ret = binder_translate_handle(fp, t, thread); + if (ret < 0) { + return_error = BR_FAILED_REPLY; + return_error_param = ret; + return_error_line = __LINE__; + goto err_translate_failed; + } + } break; + + case BINDER_TYPE_FD: { + struct binder_fd_object *fp = to_binder_fd_object(hdr); + int target_fd = binder_translate_fd(fp->fd, t, thread, + in_reply_to); + + if (target_fd < 0) { + return_error = BR_FAILED_REPLY; + return_error_param = target_fd; + return_error_line = __LINE__; + goto err_translate_failed; + } + fp->pad_binder = 0; + fp->fd = target_fd; + } break; + case BINDER_TYPE_FDA: { + struct binder_fd_array_object *fda = + to_binder_fd_array_object(hdr); + struct binder_buffer_object *parent = + binder_validate_ptr(t->buffer, fda->parent, + off_start, + offp - off_start); + if (!parent) { + binder_user_error("%d:%d got transaction with invalid parent offset or type\n", + proc->pid, thread->pid); + return_error = BR_FAILED_REPLY; + return_error_param = -EINVAL; + return_error_line = __LINE__; + goto err_bad_parent; + } + if (!binder_validate_fixup(t->buffer, off_start, + parent, fda->parent_offset, + last_fixup_obj, + last_fixup_min_off)) { + binder_user_error("%d:%d got transaction with out-of-order buffer fixup\n", + proc->pid, thread->pid); + return_error = BR_FAILED_REPLY; + return_error_param = -EINVAL; + return_error_line = __LINE__; + goto err_bad_parent; + } + ret = binder_translate_fd_array(fda, parent, t, thread, + in_reply_to); + if (ret < 0) { + return_error = BR_FAILED_REPLY; + return_error_param = ret; + return_error_line = __LINE__; + goto err_translate_failed; + } + last_fixup_obj = parent; + last_fixup_min_off = + fda->parent_offset + sizeof(u32) * fda->num_fds; + } break; + case BINDER_TYPE_PTR: { + struct binder_buffer_object *bp = + to_binder_buffer_object(hdr); + size_t buf_left = sg_buf_end - sg_bufp; + + if (bp->length > buf_left) { + binder_user_error("%d:%d got transaction with too large buffer\n", + proc->pid, thread->pid); + return_error = BR_FAILED_REPLY; + return_error_param = -EINVAL; + return_error_line = __LINE__; + goto err_bad_offset; + } + if (copy_from_user(sg_bufp, + (const void __user *)(uintptr_t) + bp->buffer, bp->length)) { + binder_user_error("%d:%d got transaction with invalid offsets ptr\n", + proc->pid, thread->pid); + return_error_param = -EFAULT; + return_error = BR_FAILED_REPLY; + return_error_line = __LINE__; + goto err_copy_data_failed; + } + /* Fixup buffer pointer to target proc address space */ + bp->buffer = (uintptr_t)sg_bufp + + binder_alloc_get_user_buffer_offset( + &target_proc->alloc); + sg_bufp += ALIGN(bp->length, sizeof(u64)); + + ret = binder_fixup_parent(t, thread, bp, off_start, + offp - off_start, + last_fixup_obj, + last_fixup_min_off); + if (ret < 0) { + return_error = BR_FAILED_REPLY; + return_error_param = ret; + return_error_line = __LINE__; + goto err_translate_failed; + } + last_fixup_obj = bp; + last_fixup_min_off = 0; + } break; + default: + binder_user_error("%d:%d got transaction with invalid object type, %x\n", + proc->pid, thread->pid, hdr->type); + return_error = BR_FAILED_REPLY; + return_error_param = -EINVAL; + return_error_line = __LINE__; + goto err_bad_object_type; + } + } + tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE; + t->work.type = BINDER_WORK_TRANSACTION; + + if (reply) { + binder_enqueue_thread_work(thread, tcomplete); + binder_inner_proc_lock(target_proc); + if (target_thread->is_dead) { + binder_inner_proc_unlock(target_proc); + goto err_dead_proc_or_thread; + } + BUG_ON(t->buffer->async_transaction != 0); + binder_pop_transaction_ilocked(target_thread, in_reply_to); + binder_enqueue_thread_work_ilocked(target_thread, &t->work); + binder_inner_proc_unlock(target_proc); + wake_up_interruptible_sync(&target_thread->wait); + binder_free_transaction(in_reply_to); + } else if (!(t->flags & TF_ONE_WAY)) { + BUG_ON(t->buffer->async_transaction != 0); + binder_inner_proc_lock(proc); + /* + * Defer the TRANSACTION_COMPLETE, so we don't return to + * userspace immediately; this allows the target process to + * immediately start processing this transaction, reducing + * latency. We will then return the TRANSACTION_COMPLETE when + * the target replies (or there is an error). + */ + binder_enqueue_deferred_thread_work_ilocked(thread, tcomplete); + t->need_reply = 1; + t->from_parent = thread->transaction_stack; + thread->transaction_stack = t; + binder_inner_proc_unlock(proc); + if (!binder_proc_transaction(t, target_proc, target_thread)) { + binder_inner_proc_lock(proc); + binder_pop_transaction_ilocked(thread, t); + binder_inner_proc_unlock(proc); + goto err_dead_proc_or_thread; + } + } else { + BUG_ON(target_node == NULL); + BUG_ON(t->buffer->async_transaction != 1); + binder_enqueue_thread_work(thread, tcomplete); + if (!binder_proc_transaction(t, target_proc, NULL)) + goto err_dead_proc_or_thread; + } + if (target_thread) + binder_thread_dec_tmpref(target_thread); + binder_proc_dec_tmpref(target_proc); + if (target_node) + binder_dec_node_tmpref(target_node); + /* + * write barrier to synchronize with initialization + * of log entry + */ + smp_wmb(); + WRITE_ONCE(e->debug_id_done, t_debug_id); + return; + +err_dead_proc_or_thread: + return_error = BR_DEAD_REPLY; + return_error_line = __LINE__; + binder_dequeue_work(proc, tcomplete); +err_translate_failed: +err_bad_object_type: +err_bad_offset: +err_bad_parent: +err_copy_data_failed: + trace_binder_transaction_failed_buffer_release(t->buffer); + binder_transaction_buffer_release(target_proc, t->buffer, offp); + if (target_node) + binder_dec_node_tmpref(target_node); + target_node = NULL; + t->buffer->transaction = NULL; + binder_alloc_free_buf(&target_proc->alloc, t->buffer); +err_binder_alloc_buf_failed: + kfree(tcomplete); + binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE); +err_alloc_tcomplete_failed: + kfree(t); + binder_stats_deleted(BINDER_STAT_TRANSACTION); +err_alloc_t_failed: +err_bad_todo_list: +err_bad_call_stack: +err_empty_call_stack: +err_dead_binder: +err_invalid_target_handle: + if (target_thread) + binder_thread_dec_tmpref(target_thread); + if (target_proc) + binder_proc_dec_tmpref(target_proc); + if (target_node) { + binder_dec_node(target_node, 1, 0); + binder_dec_node_tmpref(target_node); + } + + binder_debug(BINDER_DEBUG_FAILED_TRANSACTION, + "%d:%d transaction failed %d/%d, size %lld-%lld line %d\n", + proc->pid, thread->pid, return_error, return_error_param, + (u64)tr->data_size, (u64)tr->offsets_size, + return_error_line); + + { + struct binder_transaction_log_entry *fe; + + e->return_error = return_error; + e->return_error_param = return_error_param; + e->return_error_line = return_error_line; + fe = binder_transaction_log_add(&binder_transaction_log_failed); + *fe = *e; + /* + * write barrier to synchronize with initialization + * of log entry + */ + smp_wmb(); + WRITE_ONCE(e->debug_id_done, t_debug_id); + WRITE_ONCE(fe->debug_id_done, t_debug_id); + } + + BUG_ON(thread->return_error.cmd != BR_OK); + if (in_reply_to) { + thread->return_error.cmd = BR_TRANSACTION_COMPLETE; + binder_enqueue_thread_work(thread, &thread->return_error.work); + binder_send_failed_reply(in_reply_to, return_error); + } else { + thread->return_error.cmd = return_error; + binder_enqueue_thread_work(thread, &thread->return_error.work); + } +} + +static int binder_thread_write(struct binder_proc *proc, + struct binder_thread *thread, + binder_uintptr_t binder_buffer, size_t size, + binder_size_t *consumed) +{ + uint32_t cmd; + struct binder_context *context = proc->context; + void __user *buffer = (void __user *)(uintptr_t)binder_buffer; + void __user *ptr = buffer + *consumed; + void __user *end = buffer + size; + + while (ptr < end && thread->return_error.cmd == BR_OK) { + int ret; + + if (get_user(cmd, (uint32_t __user *)ptr)) + return -EFAULT; + ptr += sizeof(uint32_t); + trace_binder_command(cmd); + if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) { + atomic_inc(&binder_stats.bc[_IOC_NR(cmd)]); + atomic_inc(&proc->stats.bc[_IOC_NR(cmd)]); + atomic_inc(&thread->stats.bc[_IOC_NR(cmd)]); + } + switch (cmd) { + case BC_INCREFS: + case BC_ACQUIRE: + case BC_RELEASE: + case BC_DECREFS: { + uint32_t target; + const char *debug_string; + bool strong = cmd == BC_ACQUIRE || cmd == BC_RELEASE; + bool increment = cmd == BC_INCREFS || cmd == BC_ACQUIRE; + struct binder_ref_data rdata; + + if (get_user(target, (uint32_t __user *)ptr)) + return -EFAULT; + + ptr += sizeof(uint32_t); + ret = -1; + if (increment && !target) { + struct binder_node *ctx_mgr_node; + mutex_lock(&context->context_mgr_node_lock); + ctx_mgr_node = context->binder_context_mgr_node; + if (ctx_mgr_node) { + if (ctx_mgr_node->proc == proc) { + binder_user_error("%d:%d context manager tried to acquire desc 0\n", + proc->pid, thread->pid); + mutex_unlock(&context->context_mgr_node_lock); + return -EINVAL; + } + ret = binder_inc_ref_for_node( + proc, ctx_mgr_node, + strong, NULL, &rdata); + } + mutex_unlock(&context->context_mgr_node_lock); + } + if (ret) + ret = binder_update_ref_for_handle( + proc, target, increment, strong, + &rdata); + if (!ret && rdata.desc != target) { + binder_user_error("%d:%d tried to acquire reference to desc %d, got %d instead\n", + proc->pid, thread->pid, + target, rdata.desc); + } + switch (cmd) { + case BC_INCREFS: + debug_string = "IncRefs"; + break; + case BC_ACQUIRE: + debug_string = "Acquire"; + break; + case BC_RELEASE: + debug_string = "Release"; + break; + case BC_DECREFS: + default: + debug_string = "DecRefs"; + break; + } + if (ret) { + binder_user_error("%d:%d %s %d refcount change on invalid ref %d ret %d\n", + proc->pid, thread->pid, debug_string, + strong, target, ret); + break; + } + binder_debug(BINDER_DEBUG_USER_REFS, + "%d:%d %s ref %d desc %d s %d w %d\n", + proc->pid, thread->pid, debug_string, + rdata.debug_id, rdata.desc, rdata.strong, + rdata.weak); + break; + } + case BC_INCREFS_DONE: + case BC_ACQUIRE_DONE: { + binder_uintptr_t node_ptr; + binder_uintptr_t cookie; + struct binder_node *node; + bool free_node; + + if (get_user(node_ptr, (binder_uintptr_t __user *)ptr)) + return -EFAULT; + ptr += sizeof(binder_uintptr_t); + if (get_user(cookie, (binder_uintptr_t __user *)ptr)) + return -EFAULT; + ptr += sizeof(binder_uintptr_t); + node = binder_get_node(proc, node_ptr); + if (node == NULL) { + binder_user_error("%d:%d %s u%016llx no match\n", + proc->pid, thread->pid, + cmd == BC_INCREFS_DONE ? + "BC_INCREFS_DONE" : + "BC_ACQUIRE_DONE", + (u64)node_ptr); + break; + } + if (cookie != node->cookie) { + binder_user_error("%d:%d %s u%016llx node %d cookie mismatch %016llx != %016llx\n", + proc->pid, thread->pid, + cmd == BC_INCREFS_DONE ? + "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE", + (u64)node_ptr, node->debug_id, + (u64)cookie, (u64)node->cookie); + binder_put_node(node); + break; + } + binder_node_inner_lock(node); + if (cmd == BC_ACQUIRE_DONE) { + if (node->pending_strong_ref == 0) { + binder_user_error("%d:%d BC_ACQUIRE_DONE node %d has no pending acquire request\n", + proc->pid, thread->pid, + node->debug_id); + binder_node_inner_unlock(node); + binder_put_node(node); + break; + } + node->pending_strong_ref = 0; + } else { + if (node->pending_weak_ref == 0) { + binder_user_error("%d:%d BC_INCREFS_DONE node %d has no pending increfs request\n", + proc->pid, thread->pid, + node->debug_id); + binder_node_inner_unlock(node); + binder_put_node(node); + break; + } + node->pending_weak_ref = 0; + } + free_node = binder_dec_node_nilocked(node, + cmd == BC_ACQUIRE_DONE, 0); + WARN_ON(free_node); + binder_debug(BINDER_DEBUG_USER_REFS, + "%d:%d %s node %d ls %d lw %d tr %d\n", + proc->pid, thread->pid, + cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE", + node->debug_id, node->local_strong_refs, + node->local_weak_refs, node->tmp_refs); + binder_node_inner_unlock(node); + binder_put_node(node); + break; + } + case BC_ATTEMPT_ACQUIRE: + pr_err("BC_ATTEMPT_ACQUIRE not supported\n"); + return -EINVAL; + case BC_ACQUIRE_RESULT: + pr_err("BC_ACQUIRE_RESULT not supported\n"); + return -EINVAL; + + case BC_FREE_BUFFER: { + binder_uintptr_t data_ptr; + struct binder_buffer *buffer; + + if (get_user(data_ptr, (binder_uintptr_t __user *)ptr)) + return -EFAULT; + ptr += sizeof(binder_uintptr_t); + + buffer = binder_alloc_prepare_to_free(&proc->alloc, + data_ptr); + if (IS_ERR_OR_NULL(buffer)) { + if (PTR_ERR(buffer) == -EPERM) { + binder_user_error( + "%d:%d BC_FREE_BUFFER u%016llx matched unreturned or currently freeing buffer\n", + proc->pid, thread->pid, + (u64)data_ptr); + } else { + binder_user_error( + "%d:%d BC_FREE_BUFFER u%016llx no match\n", + proc->pid, thread->pid, + (u64)data_ptr); + } + break; + } + binder_debug(BINDER_DEBUG_FREE_BUFFER, + "%d:%d BC_FREE_BUFFER u%016llx found buffer %d for %s transaction\n", + proc->pid, thread->pid, (u64)data_ptr, + buffer->debug_id, + buffer->transaction ? "active" : "finished"); + + binder_inner_proc_lock(proc); + if (buffer->transaction) { + buffer->transaction->buffer = NULL; + buffer->transaction = NULL; + } + binder_inner_proc_unlock(proc); + if (buffer->async_transaction && buffer->target_node) { + struct binder_node *buf_node; + struct binder_work *w; + + buf_node = buffer->target_node; + binder_node_inner_lock(buf_node); + BUG_ON(!buf_node->has_async_transaction); + BUG_ON(buf_node->proc != proc); + w = binder_dequeue_work_head_ilocked( + &buf_node->async_todo); + if (!w) { + buf_node->has_async_transaction = false; + } else { + binder_enqueue_work_ilocked( + w, &proc->todo); + binder_wakeup_proc_ilocked(proc); + } + binder_node_inner_unlock(buf_node); + } + trace_binder_transaction_buffer_release(buffer); + binder_transaction_buffer_release(proc, buffer, NULL); + binder_alloc_free_buf(&proc->alloc, buffer); + break; + } + + case BC_TRANSACTION_SG: + case BC_REPLY_SG: { + struct binder_transaction_data_sg tr; + + if (copy_from_user(&tr, ptr, sizeof(tr))) + return -EFAULT; + ptr += sizeof(tr); + binder_transaction(proc, thread, &tr.transaction_data, + cmd == BC_REPLY_SG, tr.buffers_size); + break; + } + case BC_TRANSACTION: + case BC_REPLY: { + struct binder_transaction_data tr; + + if (copy_from_user(&tr, ptr, sizeof(tr))) + return -EFAULT; + ptr += sizeof(tr); + binder_transaction(proc, thread, &tr, + cmd == BC_REPLY, 0); + break; + } + + case BC_REGISTER_LOOPER: + binder_debug(BINDER_DEBUG_THREADS, + "%d:%d BC_REGISTER_LOOPER\n", + proc->pid, thread->pid); + binder_inner_proc_lock(proc); + if (thread->looper & BINDER_LOOPER_STATE_ENTERED) { + thread->looper |= BINDER_LOOPER_STATE_INVALID; + binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called after BC_ENTER_LOOPER\n", + proc->pid, thread->pid); + } else if (proc->requested_threads == 0) { + thread->looper |= BINDER_LOOPER_STATE_INVALID; + binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called without request\n", + proc->pid, thread->pid); + } else { + proc->requested_threads--; + proc->requested_threads_started++; + } + thread->looper |= BINDER_LOOPER_STATE_REGISTERED; + binder_inner_proc_unlock(proc); + break; + case BC_ENTER_LOOPER: + binder_debug(BINDER_DEBUG_THREADS, + "%d:%d BC_ENTER_LOOPER\n", + proc->pid, thread->pid); + if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) { + thread->looper |= BINDER_LOOPER_STATE_INVALID; + binder_user_error("%d:%d ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER\n", + proc->pid, thread->pid); + } + thread->looper |= BINDER_LOOPER_STATE_ENTERED; + break; + case BC_EXIT_LOOPER: + binder_debug(BINDER_DEBUG_THREADS, + "%d:%d BC_EXIT_LOOPER\n", + proc->pid, thread->pid); + thread->looper |= BINDER_LOOPER_STATE_EXITED; + break; + + case BC_REQUEST_DEATH_NOTIFICATION: + case BC_CLEAR_DEATH_NOTIFICATION: { + uint32_t target; + binder_uintptr_t cookie; + struct binder_ref *ref; + struct binder_ref_death *death = NULL; + + if (get_user(target, (uint32_t __user *)ptr)) + return -EFAULT; + ptr += sizeof(uint32_t); + if (get_user(cookie, (binder_uintptr_t __user *)ptr)) + return -EFAULT; + ptr += sizeof(binder_uintptr_t); + if (cmd == BC_REQUEST_DEATH_NOTIFICATION) { + /* + * Allocate memory for death notification + * before taking lock + */ + death = kzalloc(sizeof(*death), GFP_KERNEL); + if (death == NULL) { + WARN_ON(thread->return_error.cmd != + BR_OK); + thread->return_error.cmd = BR_ERROR; + binder_enqueue_thread_work( + thread, + &thread->return_error.work); + binder_debug( + BINDER_DEBUG_FAILED_TRANSACTION, + "%d:%d BC_REQUEST_DEATH_NOTIFICATION failed\n", + proc->pid, thread->pid); + break; + } + } + binder_proc_lock(proc); + ref = binder_get_ref_olocked(proc, target, false); + if (ref == NULL) { + binder_user_error("%d:%d %s invalid ref %d\n", + proc->pid, thread->pid, + cmd == BC_REQUEST_DEATH_NOTIFICATION ? + "BC_REQUEST_DEATH_NOTIFICATION" : + "BC_CLEAR_DEATH_NOTIFICATION", + target); + binder_proc_unlock(proc); + kfree(death); + break; + } + + binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION, + "%d:%d %s %016llx ref %d desc %d s %d w %d for node %d\n", + proc->pid, thread->pid, + cmd == BC_REQUEST_DEATH_NOTIFICATION ? + "BC_REQUEST_DEATH_NOTIFICATION" : + "BC_CLEAR_DEATH_NOTIFICATION", + (u64)cookie, ref->data.debug_id, + ref->data.desc, ref->data.strong, + ref->data.weak, ref->node->debug_id); + + binder_node_lock(ref->node); + if (cmd == BC_REQUEST_DEATH_NOTIFICATION) { + if (ref->death) { + binder_user_error("%d:%d BC_REQUEST_DEATH_NOTIFICATION death notification already set\n", + proc->pid, thread->pid); + binder_node_unlock(ref->node); + binder_proc_unlock(proc); + kfree(death); + break; + } + binder_stats_created(BINDER_STAT_DEATH); + INIT_LIST_HEAD(&death->work.entry); + death->cookie = cookie; + ref->death = death; + if (ref->node->proc == NULL) { + ref->death->work.type = BINDER_WORK_DEAD_BINDER; + + binder_inner_proc_lock(proc); + binder_enqueue_work_ilocked( + &ref->death->work, &proc->todo); + binder_wakeup_proc_ilocked(proc); + binder_inner_proc_unlock(proc); + } + } else { + if (ref->death == NULL) { + binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification not active\n", + proc->pid, thread->pid); + binder_node_unlock(ref->node); + binder_proc_unlock(proc); + break; + } + death = ref->death; + if (death->cookie != cookie) { + binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification cookie mismatch %016llx != %016llx\n", + proc->pid, thread->pid, + (u64)death->cookie, + (u64)cookie); + binder_node_unlock(ref->node); + binder_proc_unlock(proc); + break; + } + ref->death = NULL; + binder_inner_proc_lock(proc); + if (list_empty(&death->work.entry)) { + death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION; + if (thread->looper & + (BINDER_LOOPER_STATE_REGISTERED | + BINDER_LOOPER_STATE_ENTERED)) + binder_enqueue_thread_work_ilocked( + thread, + &death->work); + else { + binder_enqueue_work_ilocked( + &death->work, + &proc->todo); + binder_wakeup_proc_ilocked( + proc); + } + } else { + BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER); + death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR; + } + binder_inner_proc_unlock(proc); + } + binder_node_unlock(ref->node); + binder_proc_unlock(proc); + } break; + case BC_DEAD_BINDER_DONE: { + struct binder_work *w; + binder_uintptr_t cookie; + struct binder_ref_death *death = NULL; + + if (get_user(cookie, (binder_uintptr_t __user *)ptr)) + return -EFAULT; + + ptr += sizeof(cookie); + binder_inner_proc_lock(proc); + list_for_each_entry(w, &proc->delivered_death, + entry) { + struct binder_ref_death *tmp_death = + container_of(w, + struct binder_ref_death, + work); + + if (tmp_death->cookie == cookie) { + death = tmp_death; + break; + } + } + binder_debug(BINDER_DEBUG_DEAD_BINDER, + "%d:%d BC_DEAD_BINDER_DONE %016llx found %pK\n", + proc->pid, thread->pid, (u64)cookie, + death); + if (death == NULL) { + binder_user_error("%d:%d BC_DEAD_BINDER_DONE %016llx not found\n", + proc->pid, thread->pid, (u64)cookie); + binder_inner_proc_unlock(proc); + break; + } + binder_dequeue_work_ilocked(&death->work); + if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) { + death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION; + if (thread->looper & + (BINDER_LOOPER_STATE_REGISTERED | + BINDER_LOOPER_STATE_ENTERED)) + binder_enqueue_thread_work_ilocked( + thread, &death->work); + else { + binder_enqueue_work_ilocked( + &death->work, + &proc->todo); + binder_wakeup_proc_ilocked(proc); + } + } + binder_inner_proc_unlock(proc); + } break; + + default: + pr_err("%d:%d unknown command %d\n", + proc->pid, thread->pid, cmd); + return -EINVAL; + } + *consumed = ptr - buffer; + } + return 0; +} + +static void binder_stat_br(struct binder_proc *proc, + struct binder_thread *thread, uint32_t cmd) +{ + trace_binder_return(cmd); + if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) { + atomic_inc(&binder_stats.br[_IOC_NR(cmd)]); + atomic_inc(&proc->stats.br[_IOC_NR(cmd)]); + atomic_inc(&thread->stats.br[_IOC_NR(cmd)]); + } +} + +static int binder_put_node_cmd(struct binder_proc *proc, + struct binder_thread *thread, + void __user **ptrp, + binder_uintptr_t node_ptr, + binder_uintptr_t node_cookie, + int node_debug_id, + uint32_t cmd, const char *cmd_name) +{ + void __user *ptr = *ptrp; + + if (put_user(cmd, (uint32_t __user *)ptr)) + return -EFAULT; + ptr += sizeof(uint32_t); + + if (put_user(node_ptr, (binder_uintptr_t __user *)ptr)) + return -EFAULT; + ptr += sizeof(binder_uintptr_t); + + if (put_user(node_cookie, (binder_uintptr_t __user *)ptr)) + return -EFAULT; + ptr += sizeof(binder_uintptr_t); + + binder_stat_br(proc, thread, cmd); + binder_debug(BINDER_DEBUG_USER_REFS, "%d:%d %s %d u%016llx c%016llx\n", + proc->pid, thread->pid, cmd_name, node_debug_id, + (u64)node_ptr, (u64)node_cookie); + + *ptrp = ptr; + return 0; +} + +static int binder_wait_for_work(struct binder_thread *thread, + bool do_proc_work) +{ + DEFINE_WAIT(wait); + struct binder_proc *proc = thread->proc; + int ret = 0; + + freezer_do_not_count(); + binder_inner_proc_lock(proc); + for (;;) { + prepare_to_wait(&thread->wait, &wait, TASK_INTERRUPTIBLE); + if (binder_has_work_ilocked(thread, do_proc_work)) + break; + if (do_proc_work) + list_add(&thread->waiting_thread_node, + &proc->waiting_threads); + binder_inner_proc_unlock(proc); + schedule(); + binder_inner_proc_lock(proc); + list_del_init(&thread->waiting_thread_node); + if (signal_pending(current)) { + ret = -ERESTARTSYS; + break; + } + } + finish_wait(&thread->wait, &wait); + binder_inner_proc_unlock(proc); + freezer_count(); + + return ret; +} + +static int binder_thread_read(struct binder_proc *proc, + struct binder_thread *thread, + binder_uintptr_t binder_buffer, size_t size, + binder_size_t *consumed, int non_block) +{ + void __user *buffer = (void __user *)(uintptr_t)binder_buffer; + void __user *ptr = buffer + *consumed; + void __user *end = buffer + size; + + int ret = 0; + int wait_for_proc_work; + + if (*consumed == 0) { + if (put_user(BR_NOOP, (uint32_t __user *)ptr)) + return -EFAULT; + ptr += sizeof(uint32_t); + } + +retry: + binder_inner_proc_lock(proc); + wait_for_proc_work = binder_available_for_proc_work_ilocked(thread); + binder_inner_proc_unlock(proc); + + thread->looper |= BINDER_LOOPER_STATE_WAITING; + + trace_binder_wait_for_work(wait_for_proc_work, + !!thread->transaction_stack, + !binder_worklist_empty(proc, &thread->todo)); + if (wait_for_proc_work) { + if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED | + BINDER_LOOPER_STATE_ENTERED))) { + binder_user_error("%d:%d ERROR: Thread waiting for process work before calling BC_REGISTER_LOOPER or BC_ENTER_LOOPER (state %x)\n", + proc->pid, thread->pid, thread->looper); + wait_event_interruptible(binder_user_error_wait, + binder_stop_on_user_error < 2); + } + binder_set_nice(proc->default_priority); + } + + if (non_block) { + if (!binder_has_work(thread, wait_for_proc_work)) + ret = -EAGAIN; + } else { + ret = binder_wait_for_work(thread, wait_for_proc_work); + } + + thread->looper &= ~BINDER_LOOPER_STATE_WAITING; + + if (ret) + return ret; + + while (1) { + uint32_t cmd; + struct binder_transaction_data tr; + struct binder_work *w = NULL; + struct list_head *list = NULL; + struct binder_transaction *t = NULL; + struct binder_thread *t_from; + + binder_inner_proc_lock(proc); + if (!binder_worklist_empty_ilocked(&thread->todo)) + list = &thread->todo; + else if (!binder_worklist_empty_ilocked(&proc->todo) && + wait_for_proc_work) + list = &proc->todo; + else { + binder_inner_proc_unlock(proc); + + /* no data added */ + if (ptr - buffer == 4 && !thread->looper_need_return) + goto retry; + break; + } + + if (end - ptr < sizeof(tr) + 4) { + binder_inner_proc_unlock(proc); + break; + } + w = binder_dequeue_work_head_ilocked(list); + if (binder_worklist_empty_ilocked(&thread->todo)) + thread->process_todo = false; + + switch (w->type) { + case BINDER_WORK_TRANSACTION: { + binder_inner_proc_unlock(proc); + t = container_of(w, struct binder_transaction, work); + } break; + case BINDER_WORK_RETURN_ERROR: { + struct binder_error *e = container_of( + w, struct binder_error, work); + + WARN_ON(e->cmd == BR_OK); + binder_inner_proc_unlock(proc); + if (put_user(e->cmd, (uint32_t __user *)ptr)) + return -EFAULT; + cmd = e->cmd; + e->cmd = BR_OK; + ptr += sizeof(uint32_t); + + binder_stat_br(proc, thread, cmd); + } break; + case BINDER_WORK_TRANSACTION_COMPLETE: { + binder_inner_proc_unlock(proc); + cmd = BR_TRANSACTION_COMPLETE; + kfree(w); + binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE); + if (put_user(cmd, (uint32_t __user *)ptr)) + return -EFAULT; + ptr += sizeof(uint32_t); + + binder_stat_br(proc, thread, cmd); + binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE, + "%d:%d BR_TRANSACTION_COMPLETE\n", + proc->pid, thread->pid); + } break; + case BINDER_WORK_NODE: { + struct binder_node *node = container_of(w, struct binder_node, work); + int strong, weak; + binder_uintptr_t node_ptr = node->ptr; + binder_uintptr_t node_cookie = node->cookie; + int node_debug_id = node->debug_id; + int has_weak_ref; + int has_strong_ref; + void __user *orig_ptr = ptr; + + BUG_ON(proc != node->proc); + strong = node->internal_strong_refs || + node->local_strong_refs; + weak = !hlist_empty(&node->refs) || + node->local_weak_refs || + node->tmp_refs || strong; + has_strong_ref = node->has_strong_ref; + has_weak_ref = node->has_weak_ref; + + if (weak && !has_weak_ref) { + node->has_weak_ref = 1; + node->pending_weak_ref = 1; + node->local_weak_refs++; + } + if (strong && !has_strong_ref) { + node->has_strong_ref = 1; + node->pending_strong_ref = 1; + node->local_strong_refs++; + } + if (!strong && has_strong_ref) + node->has_strong_ref = 0; + if (!weak && has_weak_ref) + node->has_weak_ref = 0; + if (!weak && !strong) { + binder_debug(BINDER_DEBUG_INTERNAL_REFS, + "%d:%d node %d u%016llx c%016llx deleted\n", + proc->pid, thread->pid, + node_debug_id, + (u64)node_ptr, + (u64)node_cookie); + rb_erase(&node->rb_node, &proc->nodes); + binder_inner_proc_unlock(proc); + binder_node_lock(node); + /* + * Acquire the node lock before freeing the + * node to serialize with other threads that + * may have been holding the node lock while + * decrementing this node (avoids race where + * this thread frees while the other thread + * is unlocking the node after the final + * decrement) + */ + binder_node_unlock(node); + binder_free_node(node); + } else + binder_inner_proc_unlock(proc); + + if (weak && !has_weak_ref) + ret = binder_put_node_cmd( + proc, thread, &ptr, node_ptr, + node_cookie, node_debug_id, + BR_INCREFS, "BR_INCREFS"); + if (!ret && strong && !has_strong_ref) + ret = binder_put_node_cmd( + proc, thread, &ptr, node_ptr, + node_cookie, node_debug_id, + BR_ACQUIRE, "BR_ACQUIRE"); + if (!ret && !strong && has_strong_ref) + ret = binder_put_node_cmd( + proc, thread, &ptr, node_ptr, + node_cookie, node_debug_id, + BR_RELEASE, "BR_RELEASE"); + if (!ret && !weak && has_weak_ref) + ret = binder_put_node_cmd( + proc, thread, &ptr, node_ptr, + node_cookie, node_debug_id, + BR_DECREFS, "BR_DECREFS"); + if (orig_ptr == ptr) + binder_debug(BINDER_DEBUG_INTERNAL_REFS, + "%d:%d node %d u%016llx c%016llx state unchanged\n", + proc->pid, thread->pid, + node_debug_id, + (u64)node_ptr, + (u64)node_cookie); + if (ret) + return ret; + } break; + case BINDER_WORK_DEAD_BINDER: + case BINDER_WORK_DEAD_BINDER_AND_CLEAR: + case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: { + struct binder_ref_death *death; + uint32_t cmd; + binder_uintptr_t cookie; + + death = container_of(w, struct binder_ref_death, work); + if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) + cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE; + else + cmd = BR_DEAD_BINDER; + cookie = death->cookie; + + binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION, + "%d:%d %s %016llx\n", + proc->pid, thread->pid, + cmd == BR_DEAD_BINDER ? + "BR_DEAD_BINDER" : + "BR_CLEAR_DEATH_NOTIFICATION_DONE", + (u64)cookie); + if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) { + binder_inner_proc_unlock(proc); + kfree(death); + binder_stats_deleted(BINDER_STAT_DEATH); + } else { + binder_enqueue_work_ilocked( + w, &proc->delivered_death); + binder_inner_proc_unlock(proc); + } + if (put_user(cmd, (uint32_t __user *)ptr)) + return -EFAULT; + ptr += sizeof(uint32_t); + if (put_user(cookie, + (binder_uintptr_t __user *)ptr)) + return -EFAULT; + ptr += sizeof(binder_uintptr_t); + binder_stat_br(proc, thread, cmd); + if (cmd == BR_DEAD_BINDER) + goto done; /* DEAD_BINDER notifications can cause transactions */ + } break; + } + + if (!t) + continue; + + BUG_ON(t->buffer == NULL); + if (t->buffer->target_node) { + struct binder_node *target_node = t->buffer->target_node; + + tr.target.ptr = target_node->ptr; + tr.cookie = target_node->cookie; + t->saved_priority = task_nice(current); + if (t->priority < target_node->min_priority && + !(t->flags & TF_ONE_WAY)) + binder_set_nice(t->priority); + else if (!(t->flags & TF_ONE_WAY) || + t->saved_priority > target_node->min_priority) + binder_set_nice(target_node->min_priority); + cmd = BR_TRANSACTION; + } else { + tr.target.ptr = 0; + tr.cookie = 0; + cmd = BR_REPLY; + } + tr.code = t->code; + tr.flags = t->flags; + tr.sender_euid = from_kuid(current_user_ns(), t->sender_euid); + + t_from = binder_get_txn_from(t); + if (t_from) { + struct task_struct *sender = t_from->proc->tsk; + + tr.sender_pid = task_tgid_nr_ns(sender, + task_active_pid_ns(current)); + } else { + tr.sender_pid = 0; + } + + tr.data_size = t->buffer->data_size; + tr.offsets_size = t->buffer->offsets_size; + tr.data.ptr.buffer = (binder_uintptr_t) + ((uintptr_t)t->buffer->data + + binder_alloc_get_user_buffer_offset(&proc->alloc)); + tr.data.ptr.offsets = tr.data.ptr.buffer + + ALIGN(t->buffer->data_size, + sizeof(void *)); + + if (put_user(cmd, (uint32_t __user *)ptr)) { + if (t_from) + binder_thread_dec_tmpref(t_from); + + binder_cleanup_transaction(t, "put_user failed", + BR_FAILED_REPLY); + + return -EFAULT; + } + ptr += sizeof(uint32_t); + if (copy_to_user(ptr, &tr, sizeof(tr))) { + if (t_from) + binder_thread_dec_tmpref(t_from); + + binder_cleanup_transaction(t, "copy_to_user failed", + BR_FAILED_REPLY); + + return -EFAULT; + } + ptr += sizeof(tr); + + trace_binder_transaction_received(t); + binder_stat_br(proc, thread, cmd); + binder_debug(BINDER_DEBUG_TRANSACTION, + "%d:%d %s %d %d:%d, cmd %d size %zd-%zd ptr %016llx-%016llx\n", + proc->pid, thread->pid, + (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" : + "BR_REPLY", + t->debug_id, t_from ? t_from->proc->pid : 0, + t_from ? t_from->pid : 0, cmd, + t->buffer->data_size, t->buffer->offsets_size, + (u64)tr.data.ptr.buffer, (u64)tr.data.ptr.offsets); + + if (t_from) + binder_thread_dec_tmpref(t_from); + t->buffer->allow_user_free = 1; + if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) { + binder_inner_proc_lock(thread->proc); + t->to_parent = thread->transaction_stack; + t->to_thread = thread; + thread->transaction_stack = t; + binder_inner_proc_unlock(thread->proc); + } else { + binder_free_transaction(t); + } + break; + } + +done: + + *consumed = ptr - buffer; + binder_inner_proc_lock(proc); + if (proc->requested_threads == 0 && + list_empty(&thread->proc->waiting_threads) && + proc->requested_threads_started < proc->max_threads && + (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | + BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */ + /*spawn a new thread if we leave this out */) { + proc->requested_threads++; + binder_inner_proc_unlock(proc); + binder_debug(BINDER_DEBUG_THREADS, + "%d:%d BR_SPAWN_LOOPER\n", + proc->pid, thread->pid); + if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer)) + return -EFAULT; + binder_stat_br(proc, thread, BR_SPAWN_LOOPER); + } else + binder_inner_proc_unlock(proc); + return 0; +} + +static void binder_release_work(struct binder_proc *proc, + struct list_head *list) +{ + struct binder_work *w; + enum binder_work_type wtype; + + while (1) { + binder_inner_proc_lock(proc); + w = binder_dequeue_work_head_ilocked(list); + wtype = w ? w->type : 0; + binder_inner_proc_unlock(proc); + if (!w) + return; + + switch (wtype) { + case BINDER_WORK_TRANSACTION: { + struct binder_transaction *t; + + t = container_of(w, struct binder_transaction, work); + + binder_cleanup_transaction(t, "process died.", + BR_DEAD_REPLY); + } break; + case BINDER_WORK_RETURN_ERROR: { + struct binder_error *e = container_of( + w, struct binder_error, work); + + binder_debug(BINDER_DEBUG_DEAD_TRANSACTION, + "undelivered TRANSACTION_ERROR: %u\n", + e->cmd); + } break; + case BINDER_WORK_TRANSACTION_COMPLETE: { + binder_debug(BINDER_DEBUG_DEAD_TRANSACTION, + "undelivered TRANSACTION_COMPLETE\n"); + kfree(w); + binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE); + } break; + case BINDER_WORK_DEAD_BINDER_AND_CLEAR: + case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: { + struct binder_ref_death *death; + + death = container_of(w, struct binder_ref_death, work); + binder_debug(BINDER_DEBUG_DEAD_TRANSACTION, + "undelivered death notification, %016llx\n", + (u64)death->cookie); + kfree(death); + binder_stats_deleted(BINDER_STAT_DEATH); + } break; + case BINDER_WORK_NODE: + break; + default: + pr_err("unexpected work type, %d, not freed\n", + wtype); + break; + } + } + +} + +static struct binder_thread *binder_get_thread_ilocked( + struct binder_proc *proc, struct binder_thread *new_thread) +{ + struct binder_thread *thread = NULL; + struct rb_node *parent = NULL; + struct rb_node **p = &proc->threads.rb_node; + + while (*p) { + parent = *p; + thread = rb_entry(parent, struct binder_thread, rb_node); + + if (current->pid < thread->pid) + p = &(*p)->rb_left; + else if (current->pid > thread->pid) + p = &(*p)->rb_right; + else + return thread; + } + if (!new_thread) + return NULL; + thread = new_thread; + binder_stats_created(BINDER_STAT_THREAD); + thread->proc = proc; + thread->pid = current->pid; + atomic_set(&thread->tmp_ref, 0); + init_waitqueue_head(&thread->wait); + INIT_LIST_HEAD(&thread->todo); + rb_link_node(&thread->rb_node, parent, p); + rb_insert_color(&thread->rb_node, &proc->threads); + thread->looper_need_return = true; + thread->return_error.work.type = BINDER_WORK_RETURN_ERROR; + thread->return_error.cmd = BR_OK; + thread->reply_error.work.type = BINDER_WORK_RETURN_ERROR; + thread->reply_error.cmd = BR_OK; + INIT_LIST_HEAD(&new_thread->waiting_thread_node); + return thread; +} + +static struct binder_thread *binder_get_thread(struct binder_proc *proc) +{ + struct binder_thread *thread; + struct binder_thread *new_thread; + + binder_inner_proc_lock(proc); + thread = binder_get_thread_ilocked(proc, NULL); + binder_inner_proc_unlock(proc); + if (!thread) { + new_thread = kzalloc(sizeof(*thread), GFP_KERNEL); + if (new_thread == NULL) + return NULL; + binder_inner_proc_lock(proc); + thread = binder_get_thread_ilocked(proc, new_thread); + binder_inner_proc_unlock(proc); + if (thread != new_thread) + kfree(new_thread); + } + return thread; +} + +static void binder_free_proc(struct binder_proc *proc) +{ + BUG_ON(!list_empty(&proc->todo)); + BUG_ON(!list_empty(&proc->delivered_death)); + binder_alloc_deferred_release(&proc->alloc); + put_task_struct(proc->tsk); + put_cred(proc->cred); + binder_stats_deleted(BINDER_STAT_PROC); + kfree(proc); +} + +static void binder_free_thread(struct binder_thread *thread) +{ + BUG_ON(!list_empty(&thread->todo)); + binder_stats_deleted(BINDER_STAT_THREAD); + binder_proc_dec_tmpref(thread->proc); + kfree(thread); +} + +static int binder_thread_release(struct binder_proc *proc, + struct binder_thread *thread) +{ + struct binder_transaction *t; + struct binder_transaction *send_reply = NULL; + int active_transactions = 0; + struct binder_transaction *last_t = NULL; + + binder_inner_proc_lock(thread->proc); + /* + * take a ref on the proc so it survives + * after we remove this thread from proc->threads. + * The corresponding dec is when we actually + * free the thread in binder_free_thread() + */ + proc->tmp_ref++; + /* + * take a ref on this thread to ensure it + * survives while we are releasing it + */ + atomic_inc(&thread->tmp_ref); + rb_erase(&thread->rb_node, &proc->threads); + t = thread->transaction_stack; + if (t) { + spin_lock(&t->lock); + if (t->to_thread == thread) + send_reply = t; + } + thread->is_dead = true; + + while (t) { + last_t = t; + active_transactions++; + binder_debug(BINDER_DEBUG_DEAD_TRANSACTION, + "release %d:%d transaction %d %s, still active\n", + proc->pid, thread->pid, + t->debug_id, + (t->to_thread == thread) ? "in" : "out"); + + if (t->to_thread == thread) { + t->to_proc = NULL; + t->to_thread = NULL; + if (t->buffer) { + t->buffer->transaction = NULL; + t->buffer = NULL; + } + t = t->to_parent; + } else if (t->from == thread) { + t->from = NULL; + t = t->from_parent; + } else + BUG(); + spin_unlock(&last_t->lock); + if (t) + spin_lock(&t->lock); + } + + /* + * If this thread used poll, make sure we remove the waitqueue from any + * poll data structures holding it. + */ + if (thread->looper & BINDER_LOOPER_STATE_POLL) + wake_up_pollfree(&thread->wait); + + binder_inner_proc_unlock(thread->proc); + + /* + * This is needed to avoid races between wake_up_pollfree() above and + * someone else removing the last entry from the queue for other reasons + * (e.g. ep_remove_wait_queue() being called due to an epoll file + * descriptor being closed). Such other users hold an RCU read lock, so + * we can be sure they're done after we call synchronize_rcu(). + */ + if (thread->looper & BINDER_LOOPER_STATE_POLL) + synchronize_rcu(); + + if (send_reply) + binder_send_failed_reply(send_reply, BR_DEAD_REPLY); + binder_release_work(proc, &thread->todo); + binder_thread_dec_tmpref(thread); + return active_transactions; +} + +static __poll_t binder_poll(struct file *filp, + struct poll_table_struct *wait) +{ + struct binder_proc *proc = filp->private_data; + struct binder_thread *thread = NULL; + bool wait_for_proc_work; + + thread = binder_get_thread(proc); + if (!thread) + return POLLERR; + + binder_inner_proc_lock(thread->proc); + thread->looper |= BINDER_LOOPER_STATE_POLL; + wait_for_proc_work = binder_available_for_proc_work_ilocked(thread); + + binder_inner_proc_unlock(thread->proc); + + poll_wait(filp, &thread->wait, wait); + + if (binder_has_work(thread, wait_for_proc_work)) + return EPOLLIN; + + return 0; +} + +static int binder_ioctl_write_read(struct file *filp, + unsigned int cmd, unsigned long arg, + struct binder_thread *thread) +{ + int ret = 0; + struct binder_proc *proc = filp->private_data; + unsigned int size = _IOC_SIZE(cmd); + void __user *ubuf = (void __user *)arg; + struct binder_write_read bwr; + + if (size != sizeof(struct binder_write_read)) { + ret = -EINVAL; + goto out; + } + if (copy_from_user(&bwr, ubuf, sizeof(bwr))) { + ret = -EFAULT; + goto out; + } + binder_debug(BINDER_DEBUG_READ_WRITE, + "%d:%d write %lld at %016llx, read %lld at %016llx\n", + proc->pid, thread->pid, + (u64)bwr.write_size, (u64)bwr.write_buffer, + (u64)bwr.read_size, (u64)bwr.read_buffer); + + if (bwr.write_size > 0) { + ret = binder_thread_write(proc, thread, + bwr.write_buffer, + bwr.write_size, + &bwr.write_consumed); + trace_binder_write_done(ret); + if (ret < 0) { + bwr.read_consumed = 0; + if (copy_to_user(ubuf, &bwr, sizeof(bwr))) + ret = -EFAULT; + goto out; + } + } + if (bwr.read_size > 0) { + ret = binder_thread_read(proc, thread, bwr.read_buffer, + bwr.read_size, + &bwr.read_consumed, + filp->f_flags & O_NONBLOCK); + trace_binder_read_done(ret); + binder_inner_proc_lock(proc); + if (!binder_worklist_empty_ilocked(&proc->todo)) + binder_wakeup_proc_ilocked(proc); + binder_inner_proc_unlock(proc); + if (ret < 0) { + if (copy_to_user(ubuf, &bwr, sizeof(bwr))) + ret = -EFAULT; + goto out; + } + } + binder_debug(BINDER_DEBUG_READ_WRITE, + "%d:%d wrote %lld of %lld, read return %lld of %lld\n", + proc->pid, thread->pid, + (u64)bwr.write_consumed, (u64)bwr.write_size, + (u64)bwr.read_consumed, (u64)bwr.read_size); + if (copy_to_user(ubuf, &bwr, sizeof(bwr))) { + ret = -EFAULT; + goto out; + } +out: + return ret; +} + +static int binder_ioctl_set_ctx_mgr(struct file *filp) +{ + int ret = 0; + struct binder_proc *proc = filp->private_data; + struct binder_context *context = proc->context; + struct binder_node *new_node; + kuid_t curr_euid = current_euid(); + + mutex_lock(&context->context_mgr_node_lock); + if (context->binder_context_mgr_node) { + pr_err("BINDER_SET_CONTEXT_MGR already set\n"); + ret = -EBUSY; + goto out; + } + ret = security_binder_set_context_mgr(proc->cred); + if (ret < 0) + goto out; + if (uid_valid(context->binder_context_mgr_uid)) { + if (!uid_eq(context->binder_context_mgr_uid, curr_euid)) { + pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n", + from_kuid(&init_user_ns, curr_euid), + from_kuid(&init_user_ns, + context->binder_context_mgr_uid)); + ret = -EPERM; + goto out; + } + } else { + context->binder_context_mgr_uid = curr_euid; + } + new_node = binder_new_node(proc, NULL); + if (!new_node) { + ret = -ENOMEM; + goto out; + } + binder_node_lock(new_node); + new_node->local_weak_refs++; + new_node->local_strong_refs++; + new_node->has_strong_ref = 1; + new_node->has_weak_ref = 1; + context->binder_context_mgr_node = new_node; + binder_node_unlock(new_node); + binder_put_node(new_node); +out: + mutex_unlock(&context->context_mgr_node_lock); + return ret; +} + +static int binder_ioctl_get_node_debug_info(struct binder_proc *proc, + struct binder_node_debug_info *info) +{ + struct rb_node *n; + binder_uintptr_t ptr = info->ptr; + + memset(info, 0, sizeof(*info)); + + binder_inner_proc_lock(proc); + for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) { + struct binder_node *node = rb_entry(n, struct binder_node, + rb_node); + if (node->ptr > ptr) { + info->ptr = node->ptr; + info->cookie = node->cookie; + info->has_strong_ref = node->has_strong_ref; + info->has_weak_ref = node->has_weak_ref; + break; + } + } + binder_inner_proc_unlock(proc); + + return 0; +} + +static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) +{ + int ret; + struct binder_proc *proc = filp->private_data; + struct binder_thread *thread; + unsigned int size = _IOC_SIZE(cmd); + void __user *ubuf = (void __user *)arg; + + /*pr_info("binder_ioctl: %d:%d %x %lx\n", + proc->pid, current->pid, cmd, arg);*/ + + binder_selftest_alloc(&proc->alloc); + + trace_binder_ioctl(cmd, arg); + + ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2); + if (ret) + goto err_unlocked; + + thread = binder_get_thread(proc); + if (thread == NULL) { + ret = -ENOMEM; + goto err; + } + + switch (cmd) { + case BINDER_WRITE_READ: + ret = binder_ioctl_write_read(filp, cmd, arg, thread); + if (ret) + goto err; + break; + case BINDER_SET_MAX_THREADS: { + int max_threads; + + if (copy_from_user(&max_threads, ubuf, + sizeof(max_threads))) { + ret = -EINVAL; + goto err; + } + binder_inner_proc_lock(proc); + proc->max_threads = max_threads; + binder_inner_proc_unlock(proc); + break; + } + case BINDER_SET_CONTEXT_MGR: + ret = binder_ioctl_set_ctx_mgr(filp); + if (ret) + goto err; + break; + case BINDER_THREAD_EXIT: + binder_debug(BINDER_DEBUG_THREADS, "%d:%d exit\n", + proc->pid, thread->pid); + binder_thread_release(proc, thread); + thread = NULL; + break; + case BINDER_VERSION: { + struct binder_version __user *ver = ubuf; + + if (size != sizeof(struct binder_version)) { + ret = -EINVAL; + goto err; + } + if (put_user(BINDER_CURRENT_PROTOCOL_VERSION, + &ver->protocol_version)) { + ret = -EINVAL; + goto err; + } + break; + } + case BINDER_GET_NODE_DEBUG_INFO: { + struct binder_node_debug_info info; + + if (copy_from_user(&info, ubuf, sizeof(info))) { + ret = -EFAULT; + goto err; + } + + ret = binder_ioctl_get_node_debug_info(proc, &info); + if (ret < 0) + goto err; + + if (copy_to_user(ubuf, &info, sizeof(info))) { + ret = -EFAULT; + goto err; + } + break; + } + default: + ret = -EINVAL; + goto err; + } + ret = 0; +err: + if (thread) + thread->looper_need_return = false; + wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2); + if (ret && ret != -ERESTARTSYS) + pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret); +err_unlocked: + trace_binder_ioctl_done(ret); + return ret; +} + +static void binder_vma_open(struct vm_area_struct *vma) +{ + struct binder_proc *proc = vma->vm_private_data; + + binder_debug(BINDER_DEBUG_OPEN_CLOSE, + "%d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n", + proc->pid, vma->vm_start, vma->vm_end, + (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags, + (unsigned long)pgprot_val(vma->vm_page_prot)); +} + +static void binder_vma_close(struct vm_area_struct *vma) +{ + struct binder_proc *proc = vma->vm_private_data; + + binder_debug(BINDER_DEBUG_OPEN_CLOSE, + "%d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n", + proc->pid, vma->vm_start, vma->vm_end, + (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags, + (unsigned long)pgprot_val(vma->vm_page_prot)); + binder_alloc_vma_close(&proc->alloc); + binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES); +} + +static vm_fault_t binder_vm_fault(struct vm_fault *vmf) +{ + return VM_FAULT_SIGBUS; +} + +static const struct vm_operations_struct binder_vm_ops = { + .open = binder_vma_open, + .close = binder_vma_close, + .fault = binder_vm_fault, +}; + +static int binder_mmap(struct file *filp, struct vm_area_struct *vma) +{ + int ret; + struct binder_proc *proc = filp->private_data; + const char *failure_string; + + if (proc->tsk != current->group_leader) + return -EINVAL; + + if ((vma->vm_end - vma->vm_start) > SZ_4M) + vma->vm_end = vma->vm_start + SZ_4M; + + binder_debug(BINDER_DEBUG_OPEN_CLOSE, + "%s: %d %lx-%lx (%ld K) vma %lx pagep %lx\n", + __func__, proc->pid, vma->vm_start, vma->vm_end, + (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags, + (unsigned long)pgprot_val(vma->vm_page_prot)); + + if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) { + ret = -EPERM; + failure_string = "bad vm_flags"; + goto err_bad_arg; + } + vma->vm_flags |= VM_DONTCOPY | VM_MIXEDMAP; + vma->vm_flags &= ~VM_MAYWRITE; + + vma->vm_ops = &binder_vm_ops; + vma->vm_private_data = proc; + + ret = binder_alloc_mmap_handler(&proc->alloc, vma); + if (ret) + return ret; + mutex_lock(&proc->files_lock); + proc->files = get_files_struct(current); + mutex_unlock(&proc->files_lock); + return 0; + +err_bad_arg: + pr_err("%s: %d %lx-%lx %s failed %d\n", __func__, + proc->pid, vma->vm_start, vma->vm_end, failure_string, ret); + return ret; +} + +static int binder_open(struct inode *nodp, struct file *filp) +{ + struct binder_proc *proc; + struct binder_device *binder_dev; + + binder_debug(BINDER_DEBUG_OPEN_CLOSE, "%s: %d:%d\n", __func__, + current->group_leader->pid, current->pid); + + proc = kzalloc(sizeof(*proc), GFP_KERNEL); + if (proc == NULL) + return -ENOMEM; + spin_lock_init(&proc->inner_lock); + spin_lock_init(&proc->outer_lock); + get_task_struct(current->group_leader); + proc->tsk = current->group_leader; + mutex_init(&proc->files_lock); + proc->cred = get_cred(filp->f_cred); + INIT_LIST_HEAD(&proc->todo); + proc->default_priority = task_nice(current); + binder_dev = container_of(filp->private_data, struct binder_device, + miscdev); + proc->context = &binder_dev->context; + binder_alloc_init(&proc->alloc); + + binder_stats_created(BINDER_STAT_PROC); + proc->pid = current->group_leader->pid; + INIT_LIST_HEAD(&proc->delivered_death); + INIT_LIST_HEAD(&proc->waiting_threads); + filp->private_data = proc; + + mutex_lock(&binder_procs_lock); + hlist_add_head(&proc->proc_node, &binder_procs); + mutex_unlock(&binder_procs_lock); + + if (binder_debugfs_dir_entry_proc) { + char strbuf[11]; + + snprintf(strbuf, sizeof(strbuf), "%u", proc->pid); + /* + * proc debug entries are shared between contexts, so + * this will fail if the process tries to open the driver + * again with a different context. The priting code will + * anyway print all contexts that a given PID has, so this + * is not a problem. + */ + proc->debugfs_entry = debugfs_create_file(strbuf, 0444, + binder_debugfs_dir_entry_proc, + (void *)(unsigned long)proc->pid, + &binder_proc_fops); + } + + return 0; +} + +static int binder_flush(struct file *filp, fl_owner_t id) +{ + struct binder_proc *proc = filp->private_data; + + binder_defer_work(proc, BINDER_DEFERRED_FLUSH); + + return 0; +} + +static void binder_deferred_flush(struct binder_proc *proc) +{ + struct rb_node *n; + int wake_count = 0; + + binder_inner_proc_lock(proc); + for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) { + struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node); + + thread->looper_need_return = true; + if (thread->looper & BINDER_LOOPER_STATE_WAITING) { + wake_up_interruptible(&thread->wait); + wake_count++; + } + } + binder_inner_proc_unlock(proc); + + binder_debug(BINDER_DEBUG_OPEN_CLOSE, + "binder_flush: %d woke %d threads\n", proc->pid, + wake_count); +} + +static int binder_release(struct inode *nodp, struct file *filp) +{ + struct binder_proc *proc = filp->private_data; + + debugfs_remove(proc->debugfs_entry); + binder_defer_work(proc, BINDER_DEFERRED_RELEASE); + + return 0; +} + +static int binder_node_release(struct binder_node *node, int refs) +{ + struct binder_ref *ref; + int death = 0; + struct binder_proc *proc = node->proc; + + binder_release_work(proc, &node->async_todo); + + binder_node_lock(node); + binder_inner_proc_lock(proc); + binder_dequeue_work_ilocked(&node->work); + /* + * The caller must have taken a temporary ref on the node, + */ + BUG_ON(!node->tmp_refs); + if (hlist_empty(&node->refs) && node->tmp_refs == 1) { + binder_inner_proc_unlock(proc); + binder_node_unlock(node); + binder_free_node(node); + + return refs; + } + + node->proc = NULL; + node->local_strong_refs = 0; + node->local_weak_refs = 0; + binder_inner_proc_unlock(proc); + + spin_lock(&binder_dead_nodes_lock); + hlist_add_head(&node->dead_node, &binder_dead_nodes); + spin_unlock(&binder_dead_nodes_lock); + + hlist_for_each_entry(ref, &node->refs, node_entry) { + refs++; + /* + * Need the node lock to synchronize + * with new notification requests and the + * inner lock to synchronize with queued + * death notifications. + */ + binder_inner_proc_lock(ref->proc); + if (!ref->death) { + binder_inner_proc_unlock(ref->proc); + continue; + } + + death++; + + BUG_ON(!list_empty(&ref->death->work.entry)); + ref->death->work.type = BINDER_WORK_DEAD_BINDER; + binder_enqueue_work_ilocked(&ref->death->work, + &ref->proc->todo); + binder_wakeup_proc_ilocked(ref->proc); + binder_inner_proc_unlock(ref->proc); + } + + binder_debug(BINDER_DEBUG_DEAD_BINDER, + "node %d now dead, refs %d, death %d\n", + node->debug_id, refs, death); + binder_node_unlock(node); + binder_put_node(node); + + return refs; +} + +static void binder_deferred_release(struct binder_proc *proc) +{ + struct binder_context *context = proc->context; + struct rb_node *n; + int threads, nodes, incoming_refs, outgoing_refs, active_transactions; + + BUG_ON(proc->files); + + mutex_lock(&binder_procs_lock); + hlist_del(&proc->proc_node); + mutex_unlock(&binder_procs_lock); + + mutex_lock(&context->context_mgr_node_lock); + if (context->binder_context_mgr_node && + context->binder_context_mgr_node->proc == proc) { + binder_debug(BINDER_DEBUG_DEAD_BINDER, + "%s: %d context_mgr_node gone\n", + __func__, proc->pid); + context->binder_context_mgr_node = NULL; + } + mutex_unlock(&context->context_mgr_node_lock); + binder_inner_proc_lock(proc); + /* + * Make sure proc stays alive after we + * remove all the threads + */ + proc->tmp_ref++; + + proc->is_dead = true; + threads = 0; + active_transactions = 0; + while ((n = rb_first(&proc->threads))) { + struct binder_thread *thread; + + thread = rb_entry(n, struct binder_thread, rb_node); + binder_inner_proc_unlock(proc); + threads++; + active_transactions += binder_thread_release(proc, thread); + binder_inner_proc_lock(proc); + } + + nodes = 0; + incoming_refs = 0; + while ((n = rb_first(&proc->nodes))) { + struct binder_node *node; + + node = rb_entry(n, struct binder_node, rb_node); + nodes++; + /* + * take a temporary ref on the node before + * calling binder_node_release() which will either + * kfree() the node or call binder_put_node() + */ + binder_inc_node_tmpref_ilocked(node); + rb_erase(&node->rb_node, &proc->nodes); + binder_inner_proc_unlock(proc); + incoming_refs = binder_node_release(node, incoming_refs); + binder_inner_proc_lock(proc); + } + binder_inner_proc_unlock(proc); + + outgoing_refs = 0; + binder_proc_lock(proc); + while ((n = rb_first(&proc->refs_by_desc))) { + struct binder_ref *ref; + + ref = rb_entry(n, struct binder_ref, rb_node_desc); + outgoing_refs++; + binder_cleanup_ref_olocked(ref); + binder_proc_unlock(proc); + binder_free_ref(ref); + binder_proc_lock(proc); + } + binder_proc_unlock(proc); + + binder_release_work(proc, &proc->todo); + binder_release_work(proc, &proc->delivered_death); + + binder_debug(BINDER_DEBUG_OPEN_CLOSE, + "%s: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d\n", + __func__, proc->pid, threads, nodes, incoming_refs, + outgoing_refs, active_transactions); + + binder_proc_dec_tmpref(proc); +} + +static void binder_deferred_func(struct work_struct *work) +{ + struct binder_proc *proc; + struct files_struct *files; + + int defer; + + do { + mutex_lock(&binder_deferred_lock); + if (!hlist_empty(&binder_deferred_list)) { + proc = hlist_entry(binder_deferred_list.first, + struct binder_proc, deferred_work_node); + hlist_del_init(&proc->deferred_work_node); + defer = proc->deferred_work; + proc->deferred_work = 0; + } else { + proc = NULL; + defer = 0; + } + mutex_unlock(&binder_deferred_lock); + + files = NULL; + if (defer & BINDER_DEFERRED_PUT_FILES) { + mutex_lock(&proc->files_lock); + files = proc->files; + if (files) + proc->files = NULL; + mutex_unlock(&proc->files_lock); + } + + if (defer & BINDER_DEFERRED_FLUSH) + binder_deferred_flush(proc); + + if (defer & BINDER_DEFERRED_RELEASE) + binder_deferred_release(proc); /* frees proc */ + + if (files) + put_files_struct(files); + } while (proc); +} +static DECLARE_WORK(binder_deferred_work, binder_deferred_func); + +static void +binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer) +{ + mutex_lock(&binder_deferred_lock); + proc->deferred_work |= defer; + if (hlist_unhashed(&proc->deferred_work_node)) { + hlist_add_head(&proc->deferred_work_node, + &binder_deferred_list); + schedule_work(&binder_deferred_work); + } + mutex_unlock(&binder_deferred_lock); +} + +static void print_binder_transaction_ilocked(struct seq_file *m, + struct binder_proc *proc, + const char *prefix, + struct binder_transaction *t) +{ + struct binder_proc *to_proc; + struct binder_buffer *buffer = t->buffer; + + spin_lock(&t->lock); + to_proc = t->to_proc; + seq_printf(m, + "%s %d: %pK from %d:%d to %d:%d code %x flags %x pri %ld r%d", + prefix, t->debug_id, t, + t->from ? t->from->proc->pid : 0, + t->from ? t->from->pid : 0, + to_proc ? to_proc->pid : 0, + t->to_thread ? t->to_thread->pid : 0, + t->code, t->flags, t->priority, t->need_reply); + spin_unlock(&t->lock); + + if (proc != to_proc) { + /* + * Can only safely deref buffer if we are holding the + * correct proc inner lock for this node + */ + seq_puts(m, "\n"); + return; + } + + if (buffer == NULL) { + seq_puts(m, " buffer free\n"); + return; + } + if (buffer->target_node) + seq_printf(m, " node %d", buffer->target_node->debug_id); + seq_printf(m, " size %zd:%zd data %pK\n", + buffer->data_size, buffer->offsets_size, + buffer->data); +} + +static void print_binder_work_ilocked(struct seq_file *m, + struct binder_proc *proc, + const char *prefix, + const char *transaction_prefix, + struct binder_work *w) +{ + struct binder_node *node; + struct binder_transaction *t; + + switch (w->type) { + case BINDER_WORK_TRANSACTION: + t = container_of(w, struct binder_transaction, work); + print_binder_transaction_ilocked( + m, proc, transaction_prefix, t); + break; + case BINDER_WORK_RETURN_ERROR: { + struct binder_error *e = container_of( + w, struct binder_error, work); + + seq_printf(m, "%stransaction error: %u\n", + prefix, e->cmd); + } break; + case BINDER_WORK_TRANSACTION_COMPLETE: + seq_printf(m, "%stransaction complete\n", prefix); + break; + case BINDER_WORK_NODE: + node = container_of(w, struct binder_node, work); + seq_printf(m, "%snode work %d: u%016llx c%016llx\n", + prefix, node->debug_id, + (u64)node->ptr, (u64)node->cookie); + break; + case BINDER_WORK_DEAD_BINDER: + seq_printf(m, "%shas dead binder\n", prefix); + break; + case BINDER_WORK_DEAD_BINDER_AND_CLEAR: + seq_printf(m, "%shas cleared dead binder\n", prefix); + break; + case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: + seq_printf(m, "%shas cleared death notification\n", prefix); + break; + default: + seq_printf(m, "%sunknown work: type %d\n", prefix, w->type); + break; + } +} + +static void print_binder_thread_ilocked(struct seq_file *m, + struct binder_thread *thread, + int print_always) +{ + struct binder_transaction *t; + struct binder_work *w; + size_t start_pos = m->count; + size_t header_pos; + + seq_printf(m, " thread %d: l %02x need_return %d tr %d\n", + thread->pid, thread->looper, + thread->looper_need_return, + atomic_read(&thread->tmp_ref)); + header_pos = m->count; + t = thread->transaction_stack; + while (t) { + if (t->from == thread) { + print_binder_transaction_ilocked(m, thread->proc, + " outgoing transaction", t); + t = t->from_parent; + } else if (t->to_thread == thread) { + print_binder_transaction_ilocked(m, thread->proc, + " incoming transaction", t); + t = t->to_parent; + } else { + print_binder_transaction_ilocked(m, thread->proc, + " bad transaction", t); + t = NULL; + } + } + list_for_each_entry(w, &thread->todo, entry) { + print_binder_work_ilocked(m, thread->proc, " ", + " pending transaction", w); + } + if (!print_always && m->count == header_pos) + m->count = start_pos; +} + +static void print_binder_node_nilocked(struct seq_file *m, + struct binder_node *node) +{ + struct binder_ref *ref; + struct binder_work *w; + int count; + + count = 0; + hlist_for_each_entry(ref, &node->refs, node_entry) + count++; + + seq_printf(m, " node %d: u%016llx c%016llx hs %d hw %d ls %d lw %d is %d iw %d tr %d", + node->debug_id, (u64)node->ptr, (u64)node->cookie, + node->has_strong_ref, node->has_weak_ref, + node->local_strong_refs, node->local_weak_refs, + node->internal_strong_refs, count, node->tmp_refs); + if (count) { + seq_puts(m, " proc"); + hlist_for_each_entry(ref, &node->refs, node_entry) + seq_printf(m, " %d", ref->proc->pid); + } + seq_puts(m, "\n"); + if (node->proc) { + list_for_each_entry(w, &node->async_todo, entry) + print_binder_work_ilocked(m, node->proc, " ", + " pending async transaction", w); + } +} + +static void print_binder_ref_olocked(struct seq_file *m, + struct binder_ref *ref) +{ + binder_node_lock(ref->node); + seq_printf(m, " ref %d: desc %d %snode %d s %d w %d d %pK\n", + ref->data.debug_id, ref->data.desc, + ref->node->proc ? "" : "dead ", + ref->node->debug_id, ref->data.strong, + ref->data.weak, ref->death); + binder_node_unlock(ref->node); +} + +static void print_binder_proc(struct seq_file *m, + struct binder_proc *proc, int print_all) +{ + struct binder_work *w; + struct rb_node *n; + size_t start_pos = m->count; + size_t header_pos; + struct binder_node *last_node = NULL; + + seq_printf(m, "proc %d\n", proc->pid); + seq_printf(m, "context %s\n", proc->context->name); + header_pos = m->count; + + binder_inner_proc_lock(proc); + for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) + print_binder_thread_ilocked(m, rb_entry(n, struct binder_thread, + rb_node), print_all); + + for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) { + struct binder_node *node = rb_entry(n, struct binder_node, + rb_node); + /* + * take a temporary reference on the node so it + * survives and isn't removed from the tree + * while we print it. + */ + binder_inc_node_tmpref_ilocked(node); + /* Need to drop inner lock to take node lock */ + binder_inner_proc_unlock(proc); + if (last_node) + binder_put_node(last_node); + binder_node_inner_lock(node); + print_binder_node_nilocked(m, node); + binder_node_inner_unlock(node); + last_node = node; + binder_inner_proc_lock(proc); + } + binder_inner_proc_unlock(proc); + if (last_node) + binder_put_node(last_node); + + if (print_all) { + binder_proc_lock(proc); + for (n = rb_first(&proc->refs_by_desc); + n != NULL; + n = rb_next(n)) + print_binder_ref_olocked(m, rb_entry(n, + struct binder_ref, + rb_node_desc)); + binder_proc_unlock(proc); + } + binder_alloc_print_allocated(m, &proc->alloc); + binder_inner_proc_lock(proc); + list_for_each_entry(w, &proc->todo, entry) + print_binder_work_ilocked(m, proc, " ", + " pending transaction", w); + list_for_each_entry(w, &proc->delivered_death, entry) { + seq_puts(m, " has delivered dead binder\n"); + break; + } + binder_inner_proc_unlock(proc); + if (!print_all && m->count == header_pos) + m->count = start_pos; +} + +static const char * const binder_return_strings[] = { + "BR_ERROR", + "BR_OK", + "BR_TRANSACTION", + "BR_REPLY", + "BR_ACQUIRE_RESULT", + "BR_DEAD_REPLY", + "BR_TRANSACTION_COMPLETE", + "BR_INCREFS", + "BR_ACQUIRE", + "BR_RELEASE", + "BR_DECREFS", + "BR_ATTEMPT_ACQUIRE", + "BR_NOOP", + "BR_SPAWN_LOOPER", + "BR_FINISHED", + "BR_DEAD_BINDER", + "BR_CLEAR_DEATH_NOTIFICATION_DONE", + "BR_FAILED_REPLY" +}; + +static const char * const binder_command_strings[] = { + "BC_TRANSACTION", + "BC_REPLY", + "BC_ACQUIRE_RESULT", + "BC_FREE_BUFFER", + "BC_INCREFS", + "BC_ACQUIRE", + "BC_RELEASE", + "BC_DECREFS", + "BC_INCREFS_DONE", + "BC_ACQUIRE_DONE", + "BC_ATTEMPT_ACQUIRE", + "BC_REGISTER_LOOPER", + "BC_ENTER_LOOPER", + "BC_EXIT_LOOPER", + "BC_REQUEST_DEATH_NOTIFICATION", + "BC_CLEAR_DEATH_NOTIFICATION", + "BC_DEAD_BINDER_DONE", + "BC_TRANSACTION_SG", + "BC_REPLY_SG", +}; + +static const char * const binder_objstat_strings[] = { + "proc", + "thread", + "node", + "ref", + "death", + "transaction", + "transaction_complete" +}; + +static void print_binder_stats(struct seq_file *m, const char *prefix, + struct binder_stats *stats) +{ + int i; + + BUILD_BUG_ON(ARRAY_SIZE(stats->bc) != + ARRAY_SIZE(binder_command_strings)); + for (i = 0; i < ARRAY_SIZE(stats->bc); i++) { + int temp = atomic_read(&stats->bc[i]); + + if (temp) + seq_printf(m, "%s%s: %d\n", prefix, + binder_command_strings[i], temp); + } + + BUILD_BUG_ON(ARRAY_SIZE(stats->br) != + ARRAY_SIZE(binder_return_strings)); + for (i = 0; i < ARRAY_SIZE(stats->br); i++) { + int temp = atomic_read(&stats->br[i]); + + if (temp) + seq_printf(m, "%s%s: %d\n", prefix, + binder_return_strings[i], temp); + } + + BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) != + ARRAY_SIZE(binder_objstat_strings)); + BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) != + ARRAY_SIZE(stats->obj_deleted)); + for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) { + int created = atomic_read(&stats->obj_created[i]); + int deleted = atomic_read(&stats->obj_deleted[i]); + + if (created || deleted) + seq_printf(m, "%s%s: active %d total %d\n", + prefix, + binder_objstat_strings[i], + created - deleted, + created); + } +} + +static void print_binder_proc_stats(struct seq_file *m, + struct binder_proc *proc) +{ + struct binder_work *w; + struct binder_thread *thread; + struct rb_node *n; + int count, strong, weak, ready_threads; + size_t free_async_space = + binder_alloc_get_free_async_space(&proc->alloc); + + seq_printf(m, "proc %d\n", proc->pid); + seq_printf(m, "context %s\n", proc->context->name); + count = 0; + ready_threads = 0; + binder_inner_proc_lock(proc); + for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) + count++; + + list_for_each_entry(thread, &proc->waiting_threads, waiting_thread_node) + ready_threads++; + + seq_printf(m, " threads: %d\n", count); + seq_printf(m, " requested threads: %d+%d/%d\n" + " ready threads %d\n" + " free async space %zd\n", proc->requested_threads, + proc->requested_threads_started, proc->max_threads, + ready_threads, + free_async_space); + count = 0; + for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) + count++; + binder_inner_proc_unlock(proc); + seq_printf(m, " nodes: %d\n", count); + count = 0; + strong = 0; + weak = 0; + binder_proc_lock(proc); + for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) { + struct binder_ref *ref = rb_entry(n, struct binder_ref, + rb_node_desc); + count++; + strong += ref->data.strong; + weak += ref->data.weak; + } + binder_proc_unlock(proc); + seq_printf(m, " refs: %d s %d w %d\n", count, strong, weak); + + count = binder_alloc_get_allocated_count(&proc->alloc); + seq_printf(m, " buffers: %d\n", count); + + binder_alloc_print_pages(m, &proc->alloc); + + count = 0; + binder_inner_proc_lock(proc); + list_for_each_entry(w, &proc->todo, entry) { + if (w->type == BINDER_WORK_TRANSACTION) + count++; + } + binder_inner_proc_unlock(proc); + seq_printf(m, " pending transactions: %d\n", count); + + print_binder_stats(m, " ", &proc->stats); +} + + +static int binder_state_show(struct seq_file *m, void *unused) +{ + struct binder_proc *proc; + struct binder_node *node; + struct binder_node *last_node = NULL; + + seq_puts(m, "binder state:\n"); + + spin_lock(&binder_dead_nodes_lock); + if (!hlist_empty(&binder_dead_nodes)) + seq_puts(m, "dead nodes:\n"); + hlist_for_each_entry(node, &binder_dead_nodes, dead_node) { + /* + * take a temporary reference on the node so it + * survives and isn't removed from the list + * while we print it. + */ + node->tmp_refs++; + spin_unlock(&binder_dead_nodes_lock); + if (last_node) + binder_put_node(last_node); + binder_node_lock(node); + print_binder_node_nilocked(m, node); + binder_node_unlock(node); + last_node = node; + spin_lock(&binder_dead_nodes_lock); + } + spin_unlock(&binder_dead_nodes_lock); + if (last_node) + binder_put_node(last_node); + + mutex_lock(&binder_procs_lock); + hlist_for_each_entry(proc, &binder_procs, proc_node) + print_binder_proc(m, proc, 1); + mutex_unlock(&binder_procs_lock); + + return 0; +} + +static int binder_stats_show(struct seq_file *m, void *unused) +{ + struct binder_proc *proc; + + seq_puts(m, "binder stats:\n"); + + print_binder_stats(m, "", &binder_stats); + + mutex_lock(&binder_procs_lock); + hlist_for_each_entry(proc, &binder_procs, proc_node) + print_binder_proc_stats(m, proc); + mutex_unlock(&binder_procs_lock); + + return 0; +} + +static int binder_transactions_show(struct seq_file *m, void *unused) +{ + struct binder_proc *proc; + + seq_puts(m, "binder transactions:\n"); + mutex_lock(&binder_procs_lock); + hlist_for_each_entry(proc, &binder_procs, proc_node) + print_binder_proc(m, proc, 0); + mutex_unlock(&binder_procs_lock); + + return 0; +} + +static int binder_proc_show(struct seq_file *m, void *unused) +{ + struct binder_proc *itr; + int pid = (unsigned long)m->private; + + mutex_lock(&binder_procs_lock); + hlist_for_each_entry(itr, &binder_procs, proc_node) { + if (itr->pid == pid) { + seq_puts(m, "binder proc state:\n"); + print_binder_proc(m, itr, 1); + } + } + mutex_unlock(&binder_procs_lock); + + return 0; +} + +static void print_binder_transaction_log_entry(struct seq_file *m, + struct binder_transaction_log_entry *e) +{ + int debug_id = READ_ONCE(e->debug_id_done); + /* + * read barrier to guarantee debug_id_done read before + * we print the log values + */ + smp_rmb(); + seq_printf(m, + "%d: %s from %d:%d to %d:%d context %s node %d handle %d size %d:%d ret %d/%d l=%d", + e->debug_id, (e->call_type == 2) ? "reply" : + ((e->call_type == 1) ? "async" : "call "), e->from_proc, + e->from_thread, e->to_proc, e->to_thread, e->context_name, + e->to_node, e->target_handle, e->data_size, e->offsets_size, + e->return_error, e->return_error_param, + e->return_error_line); + /* + * read-barrier to guarantee read of debug_id_done after + * done printing the fields of the entry + */ + smp_rmb(); + seq_printf(m, debug_id && debug_id == READ_ONCE(e->debug_id_done) ? + "\n" : " (incomplete)\n"); +} + +static int binder_transaction_log_show(struct seq_file *m, void *unused) +{ + struct binder_transaction_log *log = m->private; + unsigned int log_cur = atomic_read(&log->cur); + unsigned int count; + unsigned int cur; + int i; + + count = log_cur + 1; + cur = count < ARRAY_SIZE(log->entry) && !log->full ? + 0 : count % ARRAY_SIZE(log->entry); + if (count > ARRAY_SIZE(log->entry) || log->full) + count = ARRAY_SIZE(log->entry); + for (i = 0; i < count; i++) { + unsigned int index = cur++ % ARRAY_SIZE(log->entry); + + print_binder_transaction_log_entry(m, &log->entry[index]); + } + return 0; +} + +static const struct file_operations binder_fops = { + .owner = THIS_MODULE, + .poll = binder_poll, + .unlocked_ioctl = binder_ioctl, + .compat_ioctl = binder_ioctl, + .mmap = binder_mmap, + .open = binder_open, + .flush = binder_flush, + .release = binder_release, +}; + +BINDER_DEBUG_ENTRY(state); +BINDER_DEBUG_ENTRY(stats); +BINDER_DEBUG_ENTRY(transactions); +BINDER_DEBUG_ENTRY(transaction_log); + +static int __init init_binder_device(const char *name) +{ + int ret; + struct binder_device *binder_device; + + binder_device = kzalloc(sizeof(*binder_device), GFP_KERNEL); + if (!binder_device) + return -ENOMEM; + + binder_device->miscdev.fops = &binder_fops; + binder_device->miscdev.minor = MISC_DYNAMIC_MINOR; + binder_device->miscdev.name = name; + + binder_device->context.binder_context_mgr_uid = INVALID_UID; + binder_device->context.name = name; + mutex_init(&binder_device->context.context_mgr_node_lock); + + ret = misc_register(&binder_device->miscdev); + if (ret < 0) { + kfree(binder_device); + return ret; + } + + hlist_add_head(&binder_device->hlist, &binder_devices); + + return ret; +} + +static int __init binder_init(void) +{ + int ret; + char *device_name, *device_names, *device_tmp; + struct binder_device *device; + struct hlist_node *tmp; + + ret = binder_alloc_shrinker_init(); + if (ret) + return ret; + + atomic_set(&binder_transaction_log.cur, ~0U); + atomic_set(&binder_transaction_log_failed.cur, ~0U); + + binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL); + if (binder_debugfs_dir_entry_root) + binder_debugfs_dir_entry_proc = debugfs_create_dir("proc", + binder_debugfs_dir_entry_root); + + if (binder_debugfs_dir_entry_root) { + debugfs_create_file("state", + 0444, + binder_debugfs_dir_entry_root, + NULL, + &binder_state_fops); + debugfs_create_file("stats", + 0444, + binder_debugfs_dir_entry_root, + NULL, + &binder_stats_fops); + debugfs_create_file("transactions", + 0444, + binder_debugfs_dir_entry_root, + NULL, + &binder_transactions_fops); + debugfs_create_file("transaction_log", + 0444, + binder_debugfs_dir_entry_root, + &binder_transaction_log, + &binder_transaction_log_fops); + debugfs_create_file("failed_transaction_log", + 0444, + binder_debugfs_dir_entry_root, + &binder_transaction_log_failed, + &binder_transaction_log_fops); + } + + /* + * Copy the module_parameter string, because we don't want to + * tokenize it in-place. + */ + device_names = kzalloc(strlen(binder_devices_param) + 1, GFP_KERNEL); + if (!device_names) { + ret = -ENOMEM; + goto err_alloc_device_names_failed; + } + strcpy(device_names, binder_devices_param); + + device_tmp = device_names; + while ((device_name = strsep(&device_tmp, ","))) { + ret = init_binder_device(device_name); + if (ret) + goto err_init_binder_device_failed; + } + + return ret; + +err_init_binder_device_failed: + hlist_for_each_entry_safe(device, tmp, &binder_devices, hlist) { + misc_deregister(&device->miscdev); + hlist_del(&device->hlist); + kfree(device); + } + + kfree(device_names); + +err_alloc_device_names_failed: + debugfs_remove_recursive(binder_debugfs_dir_entry_root); + + return ret; +} + +device_initcall(binder_init); + +#define CREATE_TRACE_POINTS +#include "binder_trace.h" + +MODULE_LICENSE("GPL v2"); |