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Diffstat (limited to 'security/security.c')
| -rw-r--r-- | security/security.c | 5357 |
1 files changed, 5357 insertions, 0 deletions
diff --git a/security/security.c b/security/security.c new file mode 100644 index 000000000..840a3d58a --- /dev/null +++ b/security/security.c @@ -0,0 +1,5357 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Security plug functions + * + * Copyright (C) 2001 WireX Communications, Inc <chris@wirex.com> + * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com> + * Copyright (C) 2001 Networks Associates Technology, Inc <ssmalley@nai.com> + * Copyright (C) 2016 Mellanox Technologies + * Copyright (C) 2023 Microsoft Corporation <paul@paul-moore.com> + */ + +#define pr_fmt(fmt) "LSM: " fmt + +#include <linux/bpf.h> +#include <linux/capability.h> +#include <linux/dcache.h> +#include <linux/export.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/kernel_read_file.h> +#include <linux/lsm_hooks.h> +#include <linux/integrity.h> +#include <linux/ima.h> +#include <linux/evm.h> +#include <linux/fsnotify.h> +#include <linux/mman.h> +#include <linux/mount.h> +#include <linux/personality.h> +#include <linux/backing-dev.h> +#include <linux/string.h> +#include <linux/msg.h> +#include <net/flow.h> + +/* How many LSMs were built into the kernel? */ +#define LSM_COUNT (__end_lsm_info - __start_lsm_info) + +/* + * These are descriptions of the reasons that can be passed to the + * security_locked_down() LSM hook. Placing this array here allows + * all security modules to use the same descriptions for auditing + * purposes. + */ +const char *const lockdown_reasons[LOCKDOWN_CONFIDENTIALITY_MAX + 1] = { + [LOCKDOWN_NONE] = "none", + [LOCKDOWN_MODULE_SIGNATURE] = "unsigned module loading", + [LOCKDOWN_DEV_MEM] = "/dev/mem,kmem,port", + [LOCKDOWN_EFI_TEST] = "/dev/efi_test access", + [LOCKDOWN_KEXEC] = "kexec of unsigned images", + [LOCKDOWN_HIBERNATION] = "hibernation", + [LOCKDOWN_PCI_ACCESS] = "direct PCI access", + [LOCKDOWN_IOPORT] = "raw io port access", + [LOCKDOWN_MSR] = "raw MSR access", + [LOCKDOWN_ACPI_TABLES] = "modifying ACPI tables", + [LOCKDOWN_DEVICE_TREE] = "modifying device tree contents", + [LOCKDOWN_PCMCIA_CIS] = "direct PCMCIA CIS storage", + [LOCKDOWN_TIOCSSERIAL] = "reconfiguration of serial port IO", + [LOCKDOWN_MODULE_PARAMETERS] = "unsafe module parameters", + [LOCKDOWN_MMIOTRACE] = "unsafe mmio", + [LOCKDOWN_DEBUGFS] = "debugfs access", + [LOCKDOWN_XMON_WR] = "xmon write access", + [LOCKDOWN_BPF_WRITE_USER] = "use of bpf to write user RAM", + [LOCKDOWN_DBG_WRITE_KERNEL] = "use of kgdb/kdb to write kernel RAM", + [LOCKDOWN_RTAS_ERROR_INJECTION] = "RTAS error injection", + [LOCKDOWN_INTEGRITY_MAX] = "integrity", + [LOCKDOWN_KCORE] = "/proc/kcore access", + [LOCKDOWN_KPROBES] = "use of kprobes", + [LOCKDOWN_BPF_READ_KERNEL] = "use of bpf to read kernel RAM", + [LOCKDOWN_DBG_READ_KERNEL] = "use of kgdb/kdb to read kernel RAM", + [LOCKDOWN_PERF] = "unsafe use of perf", + [LOCKDOWN_TRACEFS] = "use of tracefs", + [LOCKDOWN_XMON_RW] = "xmon read and write access", + [LOCKDOWN_XFRM_SECRET] = "xfrm SA secret", + [LOCKDOWN_CONFIDENTIALITY_MAX] = "confidentiality", +}; + +struct security_hook_heads security_hook_heads __ro_after_init; +static BLOCKING_NOTIFIER_HEAD(blocking_lsm_notifier_chain); + +static struct kmem_cache *lsm_file_cache; +static struct kmem_cache *lsm_inode_cache; + +char *lsm_names; +static struct lsm_blob_sizes blob_sizes __ro_after_init; + +/* Boot-time LSM user choice */ +static __initdata const char *chosen_lsm_order; +static __initdata const char *chosen_major_lsm; + +static __initconst const char *const builtin_lsm_order = CONFIG_LSM; + +/* Ordered list of LSMs to initialize. */ +static __initdata struct lsm_info **ordered_lsms; +static __initdata struct lsm_info *exclusive; + +static __initdata bool debug; +#define init_debug(...) \ + do { \ + if (debug) \ + pr_info(__VA_ARGS__); \ + } while (0) + +static bool __init is_enabled(struct lsm_info *lsm) +{ + if (!lsm->enabled) + return false; + + return *lsm->enabled; +} + +/* Mark an LSM's enabled flag. */ +static int lsm_enabled_true __initdata = 1; +static int lsm_enabled_false __initdata = 0; +static void __init set_enabled(struct lsm_info *lsm, bool enabled) +{ + /* + * When an LSM hasn't configured an enable variable, we can use + * a hard-coded location for storing the default enabled state. + */ + if (!lsm->enabled) { + if (enabled) + lsm->enabled = &lsm_enabled_true; + else + lsm->enabled = &lsm_enabled_false; + } else if (lsm->enabled == &lsm_enabled_true) { + if (!enabled) + lsm->enabled = &lsm_enabled_false; + } else if (lsm->enabled == &lsm_enabled_false) { + if (enabled) + lsm->enabled = &lsm_enabled_true; + } else { + *lsm->enabled = enabled; + } +} + +/* Is an LSM already listed in the ordered LSMs list? */ +static bool __init exists_ordered_lsm(struct lsm_info *lsm) +{ + struct lsm_info **check; + + for (check = ordered_lsms; *check; check++) + if (*check == lsm) + return true; + + return false; +} + +/* Append an LSM to the list of ordered LSMs to initialize. */ +static int last_lsm __initdata; +static void __init append_ordered_lsm(struct lsm_info *lsm, const char *from) +{ + /* Ignore duplicate selections. */ + if (exists_ordered_lsm(lsm)) + return; + + if (WARN(last_lsm == LSM_COUNT, "%s: out of LSM slots!?\n", from)) + return; + + /* Enable this LSM, if it is not already set. */ + if (!lsm->enabled) + lsm->enabled = &lsm_enabled_true; + ordered_lsms[last_lsm++] = lsm; + + init_debug("%s ordered: %s (%s)\n", from, lsm->name, + is_enabled(lsm) ? "enabled" : "disabled"); +} + +/* Is an LSM allowed to be initialized? */ +static bool __init lsm_allowed(struct lsm_info *lsm) +{ + /* Skip if the LSM is disabled. */ + if (!is_enabled(lsm)) + return false; + + /* Not allowed if another exclusive LSM already initialized. */ + if ((lsm->flags & LSM_FLAG_EXCLUSIVE) && exclusive) { + init_debug("exclusive disabled: %s\n", lsm->name); + return false; + } + + return true; +} + +static void __init lsm_set_blob_size(int *need, int *lbs) +{ + int offset; + + if (*need <= 0) + return; + + offset = ALIGN(*lbs, sizeof(void *)); + *lbs = offset + *need; + *need = offset; +} + +static void __init lsm_set_blob_sizes(struct lsm_blob_sizes *needed) +{ + if (!needed) + return; + + lsm_set_blob_size(&needed->lbs_cred, &blob_sizes.lbs_cred); + lsm_set_blob_size(&needed->lbs_file, &blob_sizes.lbs_file); + /* + * The inode blob gets an rcu_head in addition to + * what the modules might need. + */ + if (needed->lbs_inode && blob_sizes.lbs_inode == 0) + blob_sizes.lbs_inode = sizeof(struct rcu_head); + lsm_set_blob_size(&needed->lbs_inode, &blob_sizes.lbs_inode); + lsm_set_blob_size(&needed->lbs_ipc, &blob_sizes.lbs_ipc); + lsm_set_blob_size(&needed->lbs_msg_msg, &blob_sizes.lbs_msg_msg); + lsm_set_blob_size(&needed->lbs_superblock, &blob_sizes.lbs_superblock); + lsm_set_blob_size(&needed->lbs_task, &blob_sizes.lbs_task); + lsm_set_blob_size(&needed->lbs_xattr_count, + &blob_sizes.lbs_xattr_count); +} + +/* Prepare LSM for initialization. */ +static void __init prepare_lsm(struct lsm_info *lsm) +{ + int enabled = lsm_allowed(lsm); + + /* Record enablement (to handle any following exclusive LSMs). */ + set_enabled(lsm, enabled); + + /* If enabled, do pre-initialization work. */ + if (enabled) { + if ((lsm->flags & LSM_FLAG_EXCLUSIVE) && !exclusive) { + exclusive = lsm; + init_debug("exclusive chosen: %s\n", lsm->name); + } + + lsm_set_blob_sizes(lsm->blobs); + } +} + +/* Initialize a given LSM, if it is enabled. */ +static void __init initialize_lsm(struct lsm_info *lsm) +{ + if (is_enabled(lsm)) { + int ret; + + init_debug("initializing %s\n", lsm->name); + ret = lsm->init(); + WARN(ret, "%s failed to initialize: %d\n", lsm->name, ret); + } +} + +/* Populate ordered LSMs list from comma-separated LSM name list. */ +static void __init ordered_lsm_parse(const char *order, const char *origin) +{ + struct lsm_info *lsm; + char *sep, *name, *next; + + /* LSM_ORDER_FIRST is always first. */ + for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) { + if (lsm->order == LSM_ORDER_FIRST) + append_ordered_lsm(lsm, " first"); + } + + /* Process "security=", if given. */ + if (chosen_major_lsm) { + struct lsm_info *major; + + /* + * To match the original "security=" behavior, this + * explicitly does NOT fallback to another Legacy Major + * if the selected one was separately disabled: disable + * all non-matching Legacy Major LSMs. + */ + for (major = __start_lsm_info; major < __end_lsm_info; + major++) { + if ((major->flags & LSM_FLAG_LEGACY_MAJOR) && + strcmp(major->name, chosen_major_lsm) != 0) { + set_enabled(major, false); + init_debug("security=%s disabled: %s (only one legacy major LSM)\n", + chosen_major_lsm, major->name); + } + } + } + + sep = kstrdup(order, GFP_KERNEL); + next = sep; + /* Walk the list, looking for matching LSMs. */ + while ((name = strsep(&next, ",")) != NULL) { + bool found = false; + + for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) { + if (strcmp(lsm->name, name) == 0) { + if (lsm->order == LSM_ORDER_MUTABLE) + append_ordered_lsm(lsm, origin); + found = true; + } + } + + if (!found) + init_debug("%s ignored: %s (not built into kernel)\n", + origin, name); + } + + /* Process "security=", if given. */ + if (chosen_major_lsm) { + for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) { + if (exists_ordered_lsm(lsm)) + continue; + if (strcmp(lsm->name, chosen_major_lsm) == 0) + append_ordered_lsm(lsm, "security="); + } + } + + /* LSM_ORDER_LAST is always last. */ + for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) { + if (lsm->order == LSM_ORDER_LAST) + append_ordered_lsm(lsm, " last"); + } + + /* Disable all LSMs not in the ordered list. */ + for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) { + if (exists_ordered_lsm(lsm)) + continue; + set_enabled(lsm, false); + init_debug("%s skipped: %s (not in requested order)\n", + origin, lsm->name); + } + + kfree(sep); +} + +static void __init lsm_early_cred(struct cred *cred); +static void __init lsm_early_task(struct task_struct *task); + +static int lsm_append(const char *new, char **result); + +static void __init report_lsm_order(void) +{ + struct lsm_info **lsm, *early; + int first = 0; + + pr_info("initializing lsm="); + + /* Report each enabled LSM name, comma separated. */ + for (early = __start_early_lsm_info; + early < __end_early_lsm_info; early++) + if (is_enabled(early)) + pr_cont("%s%s", first++ == 0 ? "" : ",", early->name); + for (lsm = ordered_lsms; *lsm; lsm++) + if (is_enabled(*lsm)) + pr_cont("%s%s", first++ == 0 ? "" : ",", (*lsm)->name); + + pr_cont("\n"); +} + +static void __init ordered_lsm_init(void) +{ + struct lsm_info **lsm; + + ordered_lsms = kcalloc(LSM_COUNT + 1, sizeof(*ordered_lsms), + GFP_KERNEL); + + if (chosen_lsm_order) { + if (chosen_major_lsm) { + pr_warn("security=%s is ignored because it is superseded by lsm=%s\n", + chosen_major_lsm, chosen_lsm_order); + chosen_major_lsm = NULL; + } + ordered_lsm_parse(chosen_lsm_order, "cmdline"); + } else + ordered_lsm_parse(builtin_lsm_order, "builtin"); + + for (lsm = ordered_lsms; *lsm; lsm++) + prepare_lsm(*lsm); + + report_lsm_order(); + + init_debug("cred blob size = %d\n", blob_sizes.lbs_cred); + init_debug("file blob size = %d\n", blob_sizes.lbs_file); + init_debug("inode blob size = %d\n", blob_sizes.lbs_inode); + init_debug("ipc blob size = %d\n", blob_sizes.lbs_ipc); + init_debug("msg_msg blob size = %d\n", blob_sizes.lbs_msg_msg); + init_debug("superblock blob size = %d\n", blob_sizes.lbs_superblock); + init_debug("task blob size = %d\n", blob_sizes.lbs_task); + init_debug("xattr slots = %d\n", blob_sizes.lbs_xattr_count); + + /* + * Create any kmem_caches needed for blobs + */ + if (blob_sizes.lbs_file) + lsm_file_cache = kmem_cache_create("lsm_file_cache", + blob_sizes.lbs_file, 0, + SLAB_PANIC, NULL); + if (blob_sizes.lbs_inode) + lsm_inode_cache = kmem_cache_create("lsm_inode_cache", + blob_sizes.lbs_inode, 0, + SLAB_PANIC, NULL); + + lsm_early_cred((struct cred *) current->cred); + lsm_early_task(current); + for (lsm = ordered_lsms; *lsm; lsm++) + initialize_lsm(*lsm); + + kfree(ordered_lsms); +} + +int __init early_security_init(void) +{ + struct lsm_info *lsm; + +#define LSM_HOOK(RET, DEFAULT, NAME, ...) \ + INIT_HLIST_HEAD(&security_hook_heads.NAME); +#include "linux/lsm_hook_defs.h" +#undef LSM_HOOK + + for (lsm = __start_early_lsm_info; lsm < __end_early_lsm_info; lsm++) { + if (!lsm->enabled) + lsm->enabled = &lsm_enabled_true; + prepare_lsm(lsm); + initialize_lsm(lsm); + } + + return 0; +} + +/** + * security_init - initializes the security framework + * + * This should be called early in the kernel initialization sequence. + */ +int __init security_init(void) +{ + struct lsm_info *lsm; + + init_debug("legacy security=%s\n", chosen_major_lsm ? : " *unspecified*"); + init_debug(" CONFIG_LSM=%s\n", builtin_lsm_order); + init_debug("boot arg lsm=%s\n", chosen_lsm_order ? : " *unspecified*"); + + /* + * Append the names of the early LSM modules now that kmalloc() is + * available + */ + for (lsm = __start_early_lsm_info; lsm < __end_early_lsm_info; lsm++) { + init_debug(" early started: %s (%s)\n", lsm->name, + is_enabled(lsm) ? "enabled" : "disabled"); + if (lsm->enabled) + lsm_append(lsm->name, &lsm_names); + } + + /* Load LSMs in specified order. */ + ordered_lsm_init(); + + return 0; +} + +/* Save user chosen LSM */ +static int __init choose_major_lsm(char *str) +{ + chosen_major_lsm = str; + return 1; +} +__setup("security=", choose_major_lsm); + +/* Explicitly choose LSM initialization order. */ +static int __init choose_lsm_order(char *str) +{ + chosen_lsm_order = str; + return 1; +} +__setup("lsm=", choose_lsm_order); + +/* Enable LSM order debugging. */ +static int __init enable_debug(char *str) +{ + debug = true; + return 1; +} +__setup("lsm.debug", enable_debug); + +static bool match_last_lsm(const char *list, const char *lsm) +{ + const char *last; + + if (WARN_ON(!list || !lsm)) + return false; + last = strrchr(list, ','); + if (last) + /* Pass the comma, strcmp() will check for '\0' */ + last++; + else + last = list; + return !strcmp(last, lsm); +} + +static int lsm_append(const char *new, char **result) +{ + char *cp; + + if (*result == NULL) { + *result = kstrdup(new, GFP_KERNEL); + if (*result == NULL) + return -ENOMEM; + } else { + /* Check if it is the last registered name */ + if (match_last_lsm(*result, new)) + return 0; + cp = kasprintf(GFP_KERNEL, "%s,%s", *result, new); + if (cp == NULL) + return -ENOMEM; + kfree(*result); + *result = cp; + } + return 0; +} + +/** + * security_add_hooks - Add a modules hooks to the hook lists. + * @hooks: the hooks to add + * @count: the number of hooks to add + * @lsm: the name of the security module + * + * Each LSM has to register its hooks with the infrastructure. + */ +void __init security_add_hooks(struct security_hook_list *hooks, int count, + const char *lsm) +{ + int i; + + for (i = 0; i < count; i++) { + hooks[i].lsm = lsm; + hlist_add_tail_rcu(&hooks[i].list, hooks[i].head); + } + + /* + * Don't try to append during early_security_init(), we'll come back + * and fix this up afterwards. + */ + if (slab_is_available()) { + if (lsm_append(lsm, &lsm_names) < 0) + panic("%s - Cannot get early memory.\n", __func__); + } +} + +int call_blocking_lsm_notifier(enum lsm_event event, void *data) +{ + return blocking_notifier_call_chain(&blocking_lsm_notifier_chain, + event, data); +} +EXPORT_SYMBOL(call_blocking_lsm_notifier); + +int register_blocking_lsm_notifier(struct notifier_block *nb) +{ + return blocking_notifier_chain_register(&blocking_lsm_notifier_chain, + nb); +} +EXPORT_SYMBOL(register_blocking_lsm_notifier); + +int unregister_blocking_lsm_notifier(struct notifier_block *nb) +{ + return blocking_notifier_chain_unregister(&blocking_lsm_notifier_chain, + nb); +} +EXPORT_SYMBOL(unregister_blocking_lsm_notifier); + +/** + * lsm_cred_alloc - allocate a composite cred blob + * @cred: the cred that needs a blob + * @gfp: allocation type + * + * Allocate the cred blob for all the modules + * + * Returns 0, or -ENOMEM if memory can't be allocated. + */ +static int lsm_cred_alloc(struct cred *cred, gfp_t gfp) +{ + if (blob_sizes.lbs_cred == 0) { + cred->security = NULL; + return 0; + } + + cred->security = kzalloc(blob_sizes.lbs_cred, gfp); + if (cred->security == NULL) + return -ENOMEM; + return 0; +} + +/** + * lsm_early_cred - during initialization allocate a composite cred blob + * @cred: the cred that needs a blob + * + * Allocate the cred blob for all the modules + */ +static void __init lsm_early_cred(struct cred *cred) +{ + int rc = lsm_cred_alloc(cred, GFP_KERNEL); + + if (rc) + panic("%s: Early cred alloc failed.\n", __func__); +} + +/** + * lsm_file_alloc - allocate a composite file blob + * @file: the file that needs a blob + * + * Allocate the file blob for all the modules + * + * Returns 0, or -ENOMEM if memory can't be allocated. + */ +static int lsm_file_alloc(struct file *file) +{ + if (!lsm_file_cache) { + file->f_security = NULL; + return 0; + } + + file->f_security = kmem_cache_zalloc(lsm_file_cache, GFP_KERNEL); + if (file->f_security == NULL) + return -ENOMEM; + return 0; +} + +/** + * lsm_inode_alloc - allocate a composite inode blob + * @inode: the inode that needs a blob + * + * Allocate the inode blob for all the modules + * + * Returns 0, or -ENOMEM if memory can't be allocated. + */ +int lsm_inode_alloc(struct inode *inode) +{ + if (!lsm_inode_cache) { + inode->i_security = NULL; + return 0; + } + + inode->i_security = kmem_cache_zalloc(lsm_inode_cache, GFP_NOFS); + if (inode->i_security == NULL) + return -ENOMEM; + return 0; +} + +/** + * lsm_task_alloc - allocate a composite task blob + * @task: the task that needs a blob + * + * Allocate the task blob for all the modules + * + * Returns 0, or -ENOMEM if memory can't be allocated. + */ +static int lsm_task_alloc(struct task_struct *task) +{ + if (blob_sizes.lbs_task == 0) { + task->security = NULL; + return 0; + } + + task->security = kzalloc(blob_sizes.lbs_task, GFP_KERNEL); + if (task->security == NULL) + return -ENOMEM; + return 0; +} + +/** + * lsm_ipc_alloc - allocate a composite ipc blob + * @kip: the ipc that needs a blob + * + * Allocate the ipc blob for all the modules + * + * Returns 0, or -ENOMEM if memory can't be allocated. + */ +static int lsm_ipc_alloc(struct kern_ipc_perm *kip) +{ + if (blob_sizes.lbs_ipc == 0) { + kip->security = NULL; + return 0; + } + + kip->security = kzalloc(blob_sizes.lbs_ipc, GFP_KERNEL); + if (kip->security == NULL) + return -ENOMEM; + return 0; +} + +/** + * lsm_msg_msg_alloc - allocate a composite msg_msg blob + * @mp: the msg_msg that needs a blob + * + * Allocate the ipc blob for all the modules + * + * Returns 0, or -ENOMEM if memory can't be allocated. + */ +static int lsm_msg_msg_alloc(struct msg_msg *mp) +{ + if (blob_sizes.lbs_msg_msg == 0) { + mp->security = NULL; + return 0; + } + + mp->security = kzalloc(blob_sizes.lbs_msg_msg, GFP_KERNEL); + if (mp->security == NULL) + return -ENOMEM; + return 0; +} + +/** + * lsm_early_task - during initialization allocate a composite task blob + * @task: the task that needs a blob + * + * Allocate the task blob for all the modules + */ +static void __init lsm_early_task(struct task_struct *task) +{ + int rc = lsm_task_alloc(task); + + if (rc) + panic("%s: Early task alloc failed.\n", __func__); +} + +/** + * lsm_superblock_alloc - allocate a composite superblock blob + * @sb: the superblock that needs a blob + * + * Allocate the superblock blob for all the modules + * + * Returns 0, or -ENOMEM if memory can't be allocated. + */ +static int lsm_superblock_alloc(struct super_block *sb) +{ + if (blob_sizes.lbs_superblock == 0) { + sb->s_security = NULL; + return 0; + } + + sb->s_security = kzalloc(blob_sizes.lbs_superblock, GFP_KERNEL); + if (sb->s_security == NULL) + return -ENOMEM; + return 0; +} + +/* + * The default value of the LSM hook is defined in linux/lsm_hook_defs.h and + * can be accessed with: + * + * LSM_RET_DEFAULT(<hook_name>) + * + * The macros below define static constants for the default value of each + * LSM hook. + */ +#define LSM_RET_DEFAULT(NAME) (NAME##_default) +#define DECLARE_LSM_RET_DEFAULT_void(DEFAULT, NAME) +#define DECLARE_LSM_RET_DEFAULT_int(DEFAULT, NAME) \ + static const int __maybe_unused LSM_RET_DEFAULT(NAME) = (DEFAULT); +#define LSM_HOOK(RET, DEFAULT, NAME, ...) \ + DECLARE_LSM_RET_DEFAULT_##RET(DEFAULT, NAME) + +#include <linux/lsm_hook_defs.h> +#undef LSM_HOOK + +/* + * Hook list operation macros. + * + * call_void_hook: + * This is a hook that does not return a value. + * + * call_int_hook: + * This is a hook that returns a value. + */ + +#define call_void_hook(FUNC, ...) \ + do { \ + struct security_hook_list *P; \ + \ + hlist_for_each_entry(P, &security_hook_heads.FUNC, list) \ + P->hook.FUNC(__VA_ARGS__); \ + } while (0) + +#define call_int_hook(FUNC, IRC, ...) ({ \ + int RC = IRC; \ + do { \ + struct security_hook_list *P; \ + \ + hlist_for_each_entry(P, &security_hook_heads.FUNC, list) { \ + RC = P->hook.FUNC(__VA_ARGS__); \ + if (RC != 0) \ + break; \ + } \ + } while (0); \ + RC; \ +}) + +/* Security operations */ + +/** + * security_binder_set_context_mgr() - Check if becoming binder ctx mgr is ok + * @mgr: task credentials of current binder process + * + * Check whether @mgr is allowed to be the binder context manager. + * + * Return: Return 0 if permission is granted. + */ +int security_binder_set_context_mgr(const struct cred *mgr) +{ + return call_int_hook(binder_set_context_mgr, 0, mgr); +} + +/** + * security_binder_transaction() - Check if a binder transaction is allowed + * @from: sending process + * @to: receiving process + * + * Check whether @from is allowed to invoke a binder transaction call to @to. + * + * Return: Returns 0 if permission is granted. + */ +int security_binder_transaction(const struct cred *from, + const struct cred *to) +{ + return call_int_hook(binder_transaction, 0, from, to); +} + +/** + * security_binder_transfer_binder() - Check if a binder transfer is allowed + * @from: sending process + * @to: receiving process + * + * Check whether @from is allowed to transfer a binder reference to @to. + * + * Return: Returns 0 if permission is granted. + */ +int security_binder_transfer_binder(const struct cred *from, + const struct cred *to) +{ + return call_int_hook(binder_transfer_binder, 0, from, to); +} + +/** + * security_binder_transfer_file() - Check if a binder file xfer is allowed + * @from: sending process + * @to: receiving process + * @file: file being transferred + * + * Check whether @from is allowed to transfer @file to @to. + * + * Return: Returns 0 if permission is granted. + */ +int security_binder_transfer_file(const struct cred *from, + const struct cred *to, const struct file *file) +{ + return call_int_hook(binder_transfer_file, 0, from, to, file); +} + +/** + * security_ptrace_access_check() - Check if tracing is allowed + * @child: target process + * @mode: PTRACE_MODE flags + * + * Check permission before allowing the current process to trace the @child + * process. Security modules may also want to perform a process tracing check + * during an execve in the set_security or apply_creds hooks of tracing check + * during an execve in the bprm_set_creds hook of binprm_security_ops if the + * process is being traced and its security attributes would be changed by the + * execve. + * + * Return: Returns 0 if permission is granted. + */ +int security_ptrace_access_check(struct task_struct *child, unsigned int mode) +{ + return call_int_hook(ptrace_access_check, 0, child, mode); +} + +/** + * security_ptrace_traceme() - Check if tracing is allowed + * @parent: tracing process + * + * Check that the @parent process has sufficient permission to trace the + * current process before allowing the current process to present itself to the + * @parent process for tracing. + * + * Return: Returns 0 if permission is granted. + */ +int security_ptrace_traceme(struct task_struct *parent) +{ + return call_int_hook(ptrace_traceme, 0, parent); +} + +/** + * security_capget() - Get the capability sets for a process + * @target: target process + * @effective: effective capability set + * @inheritable: inheritable capability set + * @permitted: permitted capability set + * + * Get the @effective, @inheritable, and @permitted capability sets for the + * @target process. The hook may also perform permission checking to determine + * if the current process is allowed to see the capability sets of the @target + * process. + * + * Return: Returns 0 if the capability sets were successfully obtained. + */ +int security_capget(const struct task_struct *target, + kernel_cap_t *effective, + kernel_cap_t *inheritable, + kernel_cap_t *permitted) +{ + return call_int_hook(capget, 0, target, + effective, inheritable, permitted); +} + +/** + * security_capset() - Set the capability sets for a process + * @new: new credentials for the target process + * @old: current credentials of the target process + * @effective: effective capability set + * @inheritable: inheritable capability set + * @permitted: permitted capability set + * + * Set the @effective, @inheritable, and @permitted capability sets for the + * current process. + * + * Return: Returns 0 and update @new if permission is granted. + */ +int security_capset(struct cred *new, const struct cred *old, + const kernel_cap_t *effective, + const kernel_cap_t *inheritable, + const kernel_cap_t *permitted) +{ + return call_int_hook(capset, 0, new, old, + effective, inheritable, permitted); +} + +/** + * security_capable() - Check if a process has the necessary capability + * @cred: credentials to examine + * @ns: user namespace + * @cap: capability requested + * @opts: capability check options + * + * Check whether the @tsk process has the @cap capability in the indicated + * credentials. @cap contains the capability <include/linux/capability.h>. + * @opts contains options for the capable check <include/linux/security.h>. + * + * Return: Returns 0 if the capability is granted. + */ +int security_capable(const struct cred *cred, + struct user_namespace *ns, + int cap, + unsigned int opts) +{ + return call_int_hook(capable, 0, cred, ns, cap, opts); +} + +/** + * security_quotactl() - Check if a quotactl() syscall is allowed for this fs + * @cmds: commands + * @type: type + * @id: id + * @sb: filesystem + * + * Check whether the quotactl syscall is allowed for this @sb. + * + * Return: Returns 0 if permission is granted. + */ +int security_quotactl(int cmds, int type, int id, struct super_block *sb) +{ + return call_int_hook(quotactl, 0, cmds, type, id, sb); +} + +/** + * security_quota_on() - Check if QUOTAON is allowed for a dentry + * @dentry: dentry + * + * Check whether QUOTAON is allowed for @dentry. + * + * Return: Returns 0 if permission is granted. + */ +int security_quota_on(struct dentry *dentry) +{ + return call_int_hook(quota_on, 0, dentry); +} + +/** + * security_syslog() - Check if accessing the kernel message ring is allowed + * @type: SYSLOG_ACTION_* type + * + * Check permission before accessing the kernel message ring or changing + * logging to the console. See the syslog(2) manual page for an explanation of + * the @type values. + * + * Return: Return 0 if permission is granted. + */ +int security_syslog(int type) +{ + return call_int_hook(syslog, 0, type); +} + +/** + * security_settime64() - Check if changing the system time is allowed + * @ts: new time + * @tz: timezone + * + * Check permission to change the system time, struct timespec64 is defined in + * <include/linux/time64.h> and timezone is defined in <include/linux/time.h>. + * + * Return: Returns 0 if permission is granted. + */ +int security_settime64(const struct timespec64 *ts, const struct timezone *tz) +{ + return call_int_hook(settime, 0, ts, tz); +} + +/** + * security_vm_enough_memory_mm() - Check if allocating a new mem map is allowed + * @mm: mm struct + * @pages: number of pages + * + * Check permissions for allocating a new virtual mapping. If all LSMs return + * a positive value, __vm_enough_memory() will be called with cap_sys_admin + * set. If at least one LSM returns 0 or negative, __vm_enough_memory() will be + * called with cap_sys_admin cleared. + * + * Return: Returns 0 if permission is granted by the LSM infrastructure to the + * caller. + */ +int security_vm_enough_memory_mm(struct mm_struct *mm, long pages) +{ + struct security_hook_list *hp; + int cap_sys_admin = 1; + int rc; + + /* + * The module will respond with a positive value if + * it thinks the __vm_enough_memory() call should be + * made with the cap_sys_admin set. If all of the modules + * agree that it should be set it will. If any module + * thinks it should not be set it won't. + */ + hlist_for_each_entry(hp, &security_hook_heads.vm_enough_memory, list) { + rc = hp->hook.vm_enough_memory(mm, pages); + if (rc <= 0) { + cap_sys_admin = 0; + break; + } + } + return __vm_enough_memory(mm, pages, cap_sys_admin); +} + +/** + * security_bprm_creds_for_exec() - Prepare the credentials for exec() + * @bprm: binary program information + * + * If the setup in prepare_exec_creds did not setup @bprm->cred->security + * properly for executing @bprm->file, update the LSM's portion of + * @bprm->cred->security to be what commit_creds needs to install for the new + * program. This hook may also optionally check permissions (e.g. for + * transitions between security domains). The hook must set @bprm->secureexec + * to 1 if AT_SECURE should be set to request libc enable secure mode. @bprm + * contains the linux_binprm structure. + * + * Return: Returns 0 if the hook is successful and permission is granted. + */ +int security_bprm_creds_for_exec(struct linux_binprm *bprm) +{ + return call_int_hook(bprm_creds_for_exec, 0, bprm); +} + +/** + * security_bprm_creds_from_file() - Update linux_binprm creds based on file + * @bprm: binary program information + * @file: associated file + * + * If @file is setpcap, suid, sgid or otherwise marked to change privilege upon + * exec, update @bprm->cred to reflect that change. This is called after + * finding the binary that will be executed without an interpreter. This + * ensures that the credentials will not be derived from a script that the + * binary will need to reopen, which when reopend may end up being a completely + * different file. This hook may also optionally check permissions (e.g. for + * transitions between security domains). The hook must set @bprm->secureexec + * to 1 if AT_SECURE should be set to request libc enable secure mode. The + * hook must add to @bprm->per_clear any personality flags that should be + * cleared from current->personality. @bprm contains the linux_binprm + * structure. + * + * Return: Returns 0 if the hook is successful and permission is granted. + */ +int security_bprm_creds_from_file(struct linux_binprm *bprm, struct file *file) +{ + return call_int_hook(bprm_creds_from_file, 0, bprm, file); +} + +/** + * security_bprm_check() - Mediate binary handler search + * @bprm: binary program information + * + * This hook mediates the point when a search for a binary handler will begin. + * It allows a check against the @bprm->cred->security value which was set in + * the preceding creds_for_exec call. The argv list and envp list are reliably + * available in @bprm. This hook may be called multiple times during a single + * execve. @bprm contains the linux_binprm structure. + * + * Return: Returns 0 if the hook is successful and permission is granted. + */ +int security_bprm_check(struct linux_binprm *bprm) +{ + int ret; + + ret = call_int_hook(bprm_check_security, 0, bprm); + if (ret) + return ret; + return ima_bprm_check(bprm); +} + +/** + * security_bprm_committing_creds() - Install creds for a process during exec() + * @bprm: binary program information + * + * Prepare to install the new security attributes of a process being + * transformed by an execve operation, based on the old credentials pointed to + * by @current->cred and the information set in @bprm->cred by the + * bprm_creds_for_exec hook. @bprm points to the linux_binprm structure. This + * hook is a good place to perform state changes on the process such as closing + * open file descriptors to which access will no longer be granted when the + * attributes are changed. This is called immediately before commit_creds(). + */ +void security_bprm_committing_creds(struct linux_binprm *bprm) +{ + call_void_hook(bprm_committing_creds, bprm); +} + +/** + * security_bprm_committed_creds() - Tidy up after cred install during exec() + * @bprm: binary program information + * + * Tidy up after the installation of the new security attributes of a process + * being transformed by an execve operation. The new credentials have, by this + * point, been set to @current->cred. @bprm points to the linux_binprm + * structure. This hook is a good place to perform state changes on the + * process such as clearing out non-inheritable signal state. This is called + * immediately after commit_creds(). + */ +void security_bprm_committed_creds(struct linux_binprm *bprm) +{ + call_void_hook(bprm_committed_creds, bprm); +} + +/** + * security_fs_context_submount() - Initialise fc->security + * @fc: new filesystem context + * @reference: dentry reference for submount/remount + * + * Fill out the ->security field for a new fs_context. + * + * Return: Returns 0 on success or negative error code on failure. + */ +int security_fs_context_submount(struct fs_context *fc, struct super_block *reference) +{ + return call_int_hook(fs_context_submount, 0, fc, reference); +} + +/** + * security_fs_context_dup() - Duplicate a fs_context LSM blob + * @fc: destination filesystem context + * @src_fc: source filesystem context + * + * Allocate and attach a security structure to sc->security. This pointer is + * initialised to NULL by the caller. @fc indicates the new filesystem context. + * @src_fc indicates the original filesystem context. + * + * Return: Returns 0 on success or a negative error code on failure. + */ +int security_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc) +{ + return call_int_hook(fs_context_dup, 0, fc, src_fc); +} + +/** + * security_fs_context_parse_param() - Configure a filesystem context + * @fc: filesystem context + * @param: filesystem parameter + * + * Userspace provided a parameter to configure a superblock. The LSM can + * consume the parameter or return it to the caller for use elsewhere. + * + * Return: If the parameter is used by the LSM it should return 0, if it is + * returned to the caller -ENOPARAM is returned, otherwise a negative + * error code is returned. + */ +int security_fs_context_parse_param(struct fs_context *fc, + struct fs_parameter *param) +{ + struct security_hook_list *hp; + int trc; + int rc = -ENOPARAM; + + hlist_for_each_entry(hp, &security_hook_heads.fs_context_parse_param, + list) { + trc = hp->hook.fs_context_parse_param(fc, param); + if (trc == 0) + rc = 0; + else if (trc != -ENOPARAM) + return trc; + } + return rc; +} + +/** + * security_sb_alloc() - Allocate a super_block LSM blob + * @sb: filesystem superblock + * + * Allocate and attach a security structure to the sb->s_security field. The + * s_security field is initialized to NULL when the structure is allocated. + * @sb contains the super_block structure to be modified. + * + * Return: Returns 0 if operation was successful. + */ +int security_sb_alloc(struct super_block *sb) +{ + int rc = lsm_superblock_alloc(sb); + + if (unlikely(rc)) + return rc; + rc = call_int_hook(sb_alloc_security, 0, sb); + if (unlikely(rc)) + security_sb_free(sb); + return rc; +} + +/** + * security_sb_delete() - Release super_block LSM associated objects + * @sb: filesystem superblock + * + * Release objects tied to a superblock (e.g. inodes). @sb contains the + * super_block structure being released. + */ +void security_sb_delete(struct super_block *sb) +{ + call_void_hook(sb_delete, sb); +} + +/** + * security_sb_free() - Free a super_block LSM blob + * @sb: filesystem superblock + * + * Deallocate and clear the sb->s_security field. @sb contains the super_block + * structure to be modified. + */ +void security_sb_free(struct super_block *sb) +{ + call_void_hook(sb_free_security, sb); + kfree(sb->s_security); + sb->s_security = NULL; +} + +/** + * security_free_mnt_opts() - Free memory associated with mount options + * @mnt_opts: LSM processed mount options + * + * Free memory associated with @mnt_ops. + */ +void security_free_mnt_opts(void **mnt_opts) +{ + if (!*mnt_opts) + return; + call_void_hook(sb_free_mnt_opts, *mnt_opts); + *mnt_opts = NULL; +} +EXPORT_SYMBOL(security_free_mnt_opts); + +/** + * security_sb_eat_lsm_opts() - Consume LSM mount options + * @options: mount options + * @mnt_opts: LSM processed mount options + * + * Eat (scan @options) and save them in @mnt_opts. + * + * Return: Returns 0 on success, negative values on failure. + */ +int security_sb_eat_lsm_opts(char *options, void **mnt_opts) +{ + return call_int_hook(sb_eat_lsm_opts, 0, options, mnt_opts); +} +EXPORT_SYMBOL(security_sb_eat_lsm_opts); + +/** + * security_sb_mnt_opts_compat() - Check if new mount options are allowed + * @sb: filesystem superblock + * @mnt_opts: new mount options + * + * Determine if the new mount options in @mnt_opts are allowed given the + * existing mounted filesystem at @sb. @sb superblock being compared. + * + * Return: Returns 0 if options are compatible. + */ +int security_sb_mnt_opts_compat(struct super_block *sb, + void *mnt_opts) +{ + return call_int_hook(sb_mnt_opts_compat, 0, sb, mnt_opts); +} +EXPORT_SYMBOL(security_sb_mnt_opts_compat); + +/** + * security_sb_remount() - Verify no incompatible mount changes during remount + * @sb: filesystem superblock + * @mnt_opts: (re)mount options + * + * Extracts security system specific mount options and verifies no changes are + * being made to those options. + * + * Return: Returns 0 if permission is granted. + */ +int security_sb_remount(struct super_block *sb, + void *mnt_opts) +{ + return call_int_hook(sb_remount, 0, sb, mnt_opts); +} +EXPORT_SYMBOL(security_sb_remount); + +/** + * security_sb_kern_mount() - Check if a kernel mount is allowed + * @sb: filesystem superblock + * + * Mount this @sb if allowed by permissions. + * + * Return: Returns 0 if permission is granted. + */ +int security_sb_kern_mount(struct super_block *sb) +{ + return call_int_hook(sb_kern_mount, 0, sb); +} + +/** + * security_sb_show_options() - Output the mount options for a superblock + * @m: output file + * @sb: filesystem superblock + * + * Show (print on @m) mount options for this @sb. + * + * Return: Returns 0 on success, negative values on failure. + */ +int security_sb_show_options(struct seq_file *m, struct super_block *sb) +{ + return call_int_hook(sb_show_options, 0, m, sb); +} + +/** + * security_sb_statfs() - Check if accessing fs stats is allowed + * @dentry: superblock handle + * + * Check permission before obtaining filesystem statistics for the @mnt + * mountpoint. @dentry is a handle on the superblock for the filesystem. + * + * Return: Returns 0 if permission is granted. + */ +int security_sb_statfs(struct dentry *dentry) +{ + return call_int_hook(sb_statfs, 0, dentry); +} + +/** + * security_sb_mount() - Check permission for mounting a filesystem + * @dev_name: filesystem backing device + * @path: mount point + * @type: filesystem type + * @flags: mount flags + * @data: filesystem specific data + * + * Check permission before an object specified by @dev_name is mounted on the + * mount point named by @nd. For an ordinary mount, @dev_name identifies a + * device if the file system type requires a device. For a remount + * (@flags & MS_REMOUNT), @dev_name is irrelevant. For a loopback/bind mount + * (@flags & MS_BIND), @dev_name identifies the pathname of the object being + * mounted. + * + * Return: Returns 0 if permission is granted. + */ +int security_sb_mount(const char *dev_name, const struct path *path, + const char *type, unsigned long flags, void *data) +{ + return call_int_hook(sb_mount, 0, dev_name, path, type, flags, data); +} + +/** + * security_sb_umount() - Check permission for unmounting a filesystem + * @mnt: mounted filesystem + * @flags: unmount flags + * + * Check permission before the @mnt file system is unmounted. + * + * Return: Returns 0 if permission is granted. + */ +int security_sb_umount(struct vfsmount *mnt, int flags) +{ + return call_int_hook(sb_umount, 0, mnt, flags); +} + +/** + * security_sb_pivotroot() - Check permissions for pivoting the rootfs + * @old_path: new location for current rootfs + * @new_path: location of the new rootfs + * + * Check permission before pivoting the root filesystem. + * + * Return: Returns 0 if permission is granted. + */ +int security_sb_pivotroot(const struct path *old_path, + const struct path *new_path) +{ + return call_int_hook(sb_pivotroot, 0, old_path, new_path); +} + +/** + * security_sb_set_mnt_opts() - Set the mount options for a filesystem + * @sb: filesystem superblock + * @mnt_opts: binary mount options + * @kern_flags: kernel flags (in) + * @set_kern_flags: kernel flags (out) + * + * Set the security relevant mount options used for a superblock. + * + * Return: Returns 0 on success, error on failure. + */ +int security_sb_set_mnt_opts(struct super_block *sb, + void *mnt_opts, + unsigned long kern_flags, + unsigned long *set_kern_flags) +{ + return call_int_hook(sb_set_mnt_opts, + mnt_opts ? -EOPNOTSUPP : 0, sb, + mnt_opts, kern_flags, set_kern_flags); +} +EXPORT_SYMBOL(security_sb_set_mnt_opts); + +/** + * security_sb_clone_mnt_opts() - Duplicate superblock mount options + * @oldsb: source superblock + * @newsb: destination superblock + * @kern_flags: kernel flags (in) + * @set_kern_flags: kernel flags (out) + * + * Copy all security options from a given superblock to another. + * + * Return: Returns 0 on success, error on failure. + */ +int security_sb_clone_mnt_opts(const struct super_block *oldsb, + struct super_block *newsb, + unsigned long kern_flags, + unsigned long *set_kern_flags) +{ + return call_int_hook(sb_clone_mnt_opts, 0, oldsb, newsb, + kern_flags, set_kern_flags); +} +EXPORT_SYMBOL(security_sb_clone_mnt_opts); + +/** + * security_move_mount() - Check permissions for moving a mount + * @from_path: source mount point + * @to_path: destination mount point + * + * Check permission before a mount is moved. + * + * Return: Returns 0 if permission is granted. + */ +int security_move_mount(const struct path *from_path, + const struct path *to_path) +{ + return call_int_hook(move_mount, 0, from_path, to_path); +} + +/** + * security_path_notify() - Check if setting a watch is allowed + * @path: file path + * @mask: event mask + * @obj_type: file path type + * + * Check permissions before setting a watch on events as defined by @mask, on + * an object at @path, whose type is defined by @obj_type. + * + * Return: Returns 0 if permission is granted. + */ +int security_path_notify(const struct path *path, u64 mask, + unsigned int obj_type) +{ + return call_int_hook(path_notify, 0, path, mask, obj_type); +} + +/** + * security_inode_alloc() - Allocate an inode LSM blob + * @inode: the inode + * + * Allocate and attach a security structure to @inode->i_security. The + * i_security field is initialized to NULL when the inode structure is + * allocated. + * + * Return: Return 0 if operation was successful. + */ +int security_inode_alloc(struct inode *inode) +{ + int rc = lsm_inode_alloc(inode); + + if (unlikely(rc)) + return rc; + rc = call_int_hook(inode_alloc_security, 0, inode); + if (unlikely(rc)) + security_inode_free(inode); + return rc; +} + +static void inode_free_by_rcu(struct rcu_head *head) +{ + /* + * The rcu head is at the start of the inode blob + */ + kmem_cache_free(lsm_inode_cache, head); +} + +/** + * security_inode_free() - Free an inode's LSM blob + * @inode: the inode + * + * Deallocate the inode security structure and set @inode->i_security to NULL. + */ +void security_inode_free(struct inode *inode) +{ + integrity_inode_free(inode); + call_void_hook(inode_free_security, inode); + /* + * The inode may still be referenced in a path walk and + * a call to security_inode_permission() can be made + * after inode_free_security() is called. Ideally, the VFS + * wouldn't do this, but fixing that is a much harder + * job. For now, simply free the i_security via RCU, and + * leave the current inode->i_security pointer intact. + * The inode will be freed after the RCU grace period too. + */ + if (inode->i_security) + call_rcu((struct rcu_head *)inode->i_security, + inode_free_by_rcu); +} + +/** + * security_dentry_init_security() - Perform dentry initialization + * @dentry: the dentry to initialize + * @mode: mode used to determine resource type + * @name: name of the last path component + * @xattr_name: name of the security/LSM xattr + * @ctx: pointer to the resulting LSM context + * @ctxlen: length of @ctx + * + * Compute a context for a dentry as the inode is not yet available since NFSv4 + * has no label backed by an EA anyway. It is important to note that + * @xattr_name does not need to be free'd by the caller, it is a static string. + * + * Return: Returns 0 on success, negative values on failure. + */ +int security_dentry_init_security(struct dentry *dentry, int mode, + const struct qstr *name, + const char **xattr_name, void **ctx, + u32 *ctxlen) +{ + struct security_hook_list *hp; + int rc; + + /* + * Only one module will provide a security context. + */ + hlist_for_each_entry(hp, &security_hook_heads.dentry_init_security, + list) { + rc = hp->hook.dentry_init_security(dentry, mode, name, + xattr_name, ctx, ctxlen); + if (rc != LSM_RET_DEFAULT(dentry_init_security)) + return rc; + } + return LSM_RET_DEFAULT(dentry_init_security); +} +EXPORT_SYMBOL(security_dentry_init_security); + +/** + * security_dentry_create_files_as() - Perform dentry initialization + * @dentry: the dentry to initialize + * @mode: mode used to determine resource type + * @name: name of the last path component + * @old: creds to use for LSM context calculations + * @new: creds to modify + * + * Compute a context for a dentry as the inode is not yet available and set + * that context in passed in creds so that new files are created using that + * context. Context is calculated using the passed in creds and not the creds + * of the caller. + * + * Return: Returns 0 on success, error on failure. + */ +int security_dentry_create_files_as(struct dentry *dentry, int mode, + struct qstr *name, + const struct cred *old, struct cred *new) +{ + return call_int_hook(dentry_create_files_as, 0, dentry, mode, + name, old, new); +} +EXPORT_SYMBOL(security_dentry_create_files_as); + +/** + * security_inode_init_security() - Initialize an inode's LSM context + * @inode: the inode + * @dir: parent directory + * @qstr: last component of the pathname + * @initxattrs: callback function to write xattrs + * @fs_data: filesystem specific data + * + * Obtain the security attribute name suffix and value to set on a newly + * created inode and set up the incore security field for the new inode. This + * hook is called by the fs code as part of the inode creation transaction and + * provides for atomic labeling of the inode, unlike the post_create/mkdir/... + * hooks called by the VFS. + * + * The hook function is expected to populate the xattrs array, by calling + * lsm_get_xattr_slot() to retrieve the slots reserved by the security module + * with the lbs_xattr_count field of the lsm_blob_sizes structure. For each + * slot, the hook function should set ->name to the attribute name suffix + * (e.g. selinux), to allocate ->value (will be freed by the caller) and set it + * to the attribute value, to set ->value_len to the length of the value. If + * the security module does not use security attributes or does not wish to put + * a security attribute on this particular inode, then it should return + * -EOPNOTSUPP to skip this processing. + * + * Return: Returns 0 if the LSM successfully initialized all of the inode + * security attributes that are required, negative values otherwise. + */ +int security_inode_init_security(struct inode *inode, struct inode *dir, + const struct qstr *qstr, + const initxattrs initxattrs, void *fs_data) +{ + struct security_hook_list *hp; + struct xattr *new_xattrs = NULL; + int ret = -EOPNOTSUPP, xattr_count = 0; + + if (unlikely(IS_PRIVATE(inode))) + return 0; + + if (!blob_sizes.lbs_xattr_count) + return 0; + + if (initxattrs) { + /* Allocate +1 for EVM and +1 as terminator. */ + new_xattrs = kcalloc(blob_sizes.lbs_xattr_count + 2, + sizeof(*new_xattrs), GFP_NOFS); + if (!new_xattrs) + return -ENOMEM; + } + + hlist_for_each_entry(hp, &security_hook_heads.inode_init_security, + list) { + ret = hp->hook.inode_init_security(inode, dir, qstr, new_xattrs, + &xattr_count); + if (ret && ret != -EOPNOTSUPP) + goto out; + /* + * As documented in lsm_hooks.h, -EOPNOTSUPP in this context + * means that the LSM is not willing to provide an xattr, not + * that it wants to signal an error. Thus, continue to invoke + * the remaining LSMs. + */ + } + + /* If initxattrs() is NULL, xattr_count is zero, skip the call. */ + if (!xattr_count) + goto out; + + ret = evm_inode_init_security(inode, dir, qstr, new_xattrs, + &xattr_count); + if (ret) + goto out; + ret = initxattrs(inode, new_xattrs, fs_data); +out: + for (; xattr_count > 0; xattr_count--) + kfree(new_xattrs[xattr_count - 1].value); + kfree(new_xattrs); + return (ret == -EOPNOTSUPP) ? 0 : ret; +} +EXPORT_SYMBOL(security_inode_init_security); + +/** + * security_inode_init_security_anon() - Initialize an anonymous inode + * @inode: the inode + * @name: the anonymous inode class + * @context_inode: an optional related inode + * + * Set up the incore security field for the new anonymous inode and return + * whether the inode creation is permitted by the security module or not. + * + * Return: Returns 0 on success, -EACCES if the security module denies the + * creation of this inode, or another -errno upon other errors. + */ +int security_inode_init_security_anon(struct inode *inode, + const struct qstr *name, + const struct inode *context_inode) +{ + return call_int_hook(inode_init_security_anon, 0, inode, name, + context_inode); +} + +#ifdef CONFIG_SECURITY_PATH +/** + * security_path_mknod() - Check if creating a special file is allowed + * @dir: parent directory + * @dentry: new file + * @mode: new file mode + * @dev: device number + * + * Check permissions when creating a file. Note that this hook is called even + * if mknod operation is being done for a regular file. + * + * Return: Returns 0 if permission is granted. + */ +int security_path_mknod(const struct path *dir, struct dentry *dentry, + umode_t mode, unsigned int dev) +{ + if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry)))) + return 0; + return call_int_hook(path_mknod, 0, dir, dentry, mode, dev); +} +EXPORT_SYMBOL(security_path_mknod); + +/** + * security_path_mkdir() - Check if creating a new directory is allowed + * @dir: parent directory + * @dentry: new directory + * @mode: new directory mode + * + * Check permissions to create a new directory in the existing directory. + * + * Return: Returns 0 if permission is granted. + */ +int security_path_mkdir(const struct path *dir, struct dentry *dentry, + umode_t mode) +{ + if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry)))) + return 0; + return call_int_hook(path_mkdir, 0, dir, dentry, mode); +} +EXPORT_SYMBOL(security_path_mkdir); + +/** + * security_path_rmdir() - Check if removing a directory is allowed + * @dir: parent directory + * @dentry: directory to remove + * + * Check the permission to remove a directory. + * + * Return: Returns 0 if permission is granted. + */ +int security_path_rmdir(const struct path *dir, struct dentry *dentry) +{ + if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry)))) + return 0; + return call_int_hook(path_rmdir, 0, dir, dentry); +} + +/** + * security_path_unlink() - Check if removing a hard link is allowed + * @dir: parent directory + * @dentry: file + * + * Check the permission to remove a hard link to a file. + * + * Return: Returns 0 if permission is granted. + */ +int security_path_unlink(const struct path *dir, struct dentry *dentry) +{ + if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry)))) + return 0; + return call_int_hook(path_unlink, 0, dir, dentry); +} +EXPORT_SYMBOL(security_path_unlink); + +/** + * security_path_symlink() - Check if creating a symbolic link is allowed + * @dir: parent directory + * @dentry: symbolic link + * @old_name: file pathname + * + * Check the permission to create a symbolic link to a file. + * + * Return: Returns 0 if permission is granted. + */ +int security_path_symlink(const struct path *dir, struct dentry *dentry, + const char *old_name) +{ + if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry)))) + return 0; + return call_int_hook(path_symlink, 0, dir, dentry, old_name); +} + +/** + * security_path_link - Check if creating a hard link is allowed + * @old_dentry: existing file + * @new_dir: new parent directory + * @new_dentry: new link + * + * Check permission before creating a new hard link to a file. + * + * Return: Returns 0 if permission is granted. + */ +int security_path_link(struct dentry *old_dentry, const struct path *new_dir, + struct dentry *new_dentry) +{ + if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)))) + return 0; + return call_int_hook(path_link, 0, old_dentry, new_dir, new_dentry); +} + +/** + * security_path_rename() - Check if renaming a file is allowed + * @old_dir: parent directory of the old file + * @old_dentry: the old file + * @new_dir: parent directory of the new file + * @new_dentry: the new file + * @flags: flags + * + * Check for permission to rename a file or directory. + * + * Return: Returns 0 if permission is granted. + */ +int security_path_rename(const struct path *old_dir, struct dentry *old_dentry, + const struct path *new_dir, struct dentry *new_dentry, + unsigned int flags) +{ + if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)) || + (d_is_positive(new_dentry) && + IS_PRIVATE(d_backing_inode(new_dentry))))) + return 0; + + return call_int_hook(path_rename, 0, old_dir, old_dentry, new_dir, + new_dentry, flags); +} +EXPORT_SYMBOL(security_path_rename); + +/** + * security_path_truncate() - Check if truncating a file is allowed + * @path: file + * + * Check permission before truncating the file indicated by path. Note that + * truncation permissions may also be checked based on already opened files, + * using the security_file_truncate() hook. + * + * Return: Returns 0 if permission is granted. + */ +int security_path_truncate(const struct path *path) +{ + if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry)))) + return 0; + return call_int_hook(path_truncate, 0, path); +} + +/** + * security_path_chmod() - Check if changing the file's mode is allowed + * @path: file + * @mode: new mode + * + * Check for permission to change a mode of the file @path. The new mode is + * specified in @mode which is a bitmask of constants from + * <include/uapi/linux/stat.h>. + * + * Return: Returns 0 if permission is granted. + */ +int security_path_chmod(const struct path *path, umode_t mode) +{ + if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry)))) + return 0; + return call_int_hook(path_chmod, 0, path, mode); +} + +/** + * security_path_chown() - Check if changing the file's owner/group is allowed + * @path: file + * @uid: file owner + * @gid: file group + * + * Check for permission to change owner/group of a file or directory. + * + * Return: Returns 0 if permission is granted. + */ +int security_path_chown(const struct path *path, kuid_t uid, kgid_t gid) +{ + if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry)))) + return 0; + return call_int_hook(path_chown, 0, path, uid, gid); +} + +/** + * security_path_chroot() - Check if changing the root directory is allowed + * @path: directory + * + * Check for permission to change root directory. + * + * Return: Returns 0 if permission is granted. + */ +int security_path_chroot(const struct path *path) +{ + return call_int_hook(path_chroot, 0, path); +} +#endif /* CONFIG_SECURITY_PATH */ + +/** + * security_inode_create() - Check if creating a file is allowed + * @dir: the parent directory + * @dentry: the file being created + * @mode: requested file mode + * + * Check permission to create a regular file. + * + * Return: Returns 0 if permission is granted. + */ +int security_inode_create(struct inode *dir, struct dentry *dentry, + umode_t mode) +{ + if (unlikely(IS_PRIVATE(dir))) + return 0; + return call_int_hook(inode_create, 0, dir, dentry, mode); +} +EXPORT_SYMBOL_GPL(security_inode_create); + +/** + * security_inode_link() - Check if creating a hard link is allowed + * @old_dentry: existing file + * @dir: new parent directory + * @new_dentry: new link + * + * Check permission before creating a new hard link to a file. + * + * Return: Returns 0 if permission is granted. + */ +int security_inode_link(struct dentry *old_dentry, struct inode *dir, + struct dentry *new_dentry) +{ + if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)))) + return 0; + return call_int_hook(inode_link, 0, old_dentry, dir, new_dentry); +} + +/** + * security_inode_unlink() - Check if removing a hard link is allowed + * @dir: parent directory + * @dentry: file + * + * Check the permission to remove a hard link to a file. + * + * Return: Returns 0 if permission is granted. + */ +int security_inode_unlink(struct inode *dir, struct dentry *dentry) +{ + if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) + return 0; + return call_int_hook(inode_unlink, 0, dir, dentry); +} + +/** + * security_inode_symlink() - Check if creating a symbolic link is allowed + * @dir: parent directory + * @dentry: symbolic link + * @old_name: existing filename + * + * Check the permission to create a symbolic link to a file. + * + * Return: Returns 0 if permission is granted. + */ +int security_inode_symlink(struct inode *dir, struct dentry *dentry, + const char *old_name) +{ + if (unlikely(IS_PRIVATE(dir))) + return 0; + return call_int_hook(inode_symlink, 0, dir, dentry, old_name); +} + +/** + * security_inode_mkdir() - Check if creation a new director is allowed + * @dir: parent directory + * @dentry: new directory + * @mode: new directory mode + * + * Check permissions to create a new directory in the existing directory + * associated with inode structure @dir. + * + * Return: Returns 0 if permission is granted. + */ +int security_inode_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) +{ + if (unlikely(IS_PRIVATE(dir))) + return 0; + return call_int_hook(inode_mkdir, 0, dir, dentry, mode); +} +EXPORT_SYMBOL_GPL(security_inode_mkdir); + +/** + * security_inode_rmdir() - Check if removing a directory is allowed + * @dir: parent directory + * @dentry: directory to be removed + * + * Check the permission to remove a directory. + * + * Return: Returns 0 if permission is granted. + */ +int security_inode_rmdir(struct inode *dir, struct dentry *dentry) +{ + if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) + return 0; + return call_int_hook(inode_rmdir, 0, dir, dentry); +} + +/** + * security_inode_mknod() - Check if creating a special file is allowed + * @dir: parent directory + * @dentry: new file + * @mode: new file mode + * @dev: device number + * + * Check permissions when creating a special file (or a socket or a fifo file + * created via the mknod system call). Note that if mknod operation is being + * done for a regular file, then the create hook will be called and not this + * hook. + * + * Return: Returns 0 if permission is granted. + */ +int security_inode_mknod(struct inode *dir, struct dentry *dentry, + umode_t mode, dev_t dev) +{ + if (unlikely(IS_PRIVATE(dir))) + return 0; + return call_int_hook(inode_mknod, 0, dir, dentry, mode, dev); +} + +/** + * security_inode_rename() - Check if renaming a file is allowed + * @old_dir: parent directory of the old file + * @old_dentry: the old file + * @new_dir: parent directory of the new file + * @new_dentry: the new file + * @flags: flags + * + * Check for permission to rename a file or directory. + * + * Return: Returns 0 if permission is granted. + */ +int security_inode_rename(struct inode *old_dir, struct dentry *old_dentry, + struct inode *new_dir, struct dentry *new_dentry, + unsigned int flags) +{ + if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)) || + (d_is_positive(new_dentry) && + IS_PRIVATE(d_backing_inode(new_dentry))))) + return 0; + + if (flags & RENAME_EXCHANGE) { + int err = call_int_hook(inode_rename, 0, new_dir, new_dentry, + old_dir, old_dentry); + if (err) + return err; + } + + return call_int_hook(inode_rename, 0, old_dir, old_dentry, + new_dir, new_dentry); +} + +/** + * security_inode_readlink() - Check if reading a symbolic link is allowed + * @dentry: link + * + * Check the permission to read the symbolic link. + * + * Return: Returns 0 if permission is granted. + */ +int security_inode_readlink(struct dentry *dentry) +{ + if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) + return 0; + return call_int_hook(inode_readlink, 0, dentry); +} + +/** + * security_inode_follow_link() - Check if following a symbolic link is allowed + * @dentry: link dentry + * @inode: link inode + * @rcu: true if in RCU-walk mode + * + * Check permission to follow a symbolic link when looking up a pathname. If + * @rcu is true, @inode is not stable. + * + * Return: Returns 0 if permission is granted. + */ +int security_inode_follow_link(struct dentry *dentry, struct inode *inode, + bool rcu) +{ + if (unlikely(IS_PRIVATE(inode))) + return 0; + return call_int_hook(inode_follow_link, 0, dentry, inode, rcu); +} + +/** + * security_inode_permission() - Check if accessing an inode is allowed + * @inode: inode + * @mask: access mask + * + * Check permission before accessing an inode. This hook is called by the + * existing Linux permission function, so a security module can use it to + * provide additional checking for existing Linux permission checks. Notice + * that this hook is called when a file is opened (as well as many other + * operations), whereas the file_security_ops permission hook is called when + * the actual read/write operations are performed. + * + * Return: Returns 0 if permission is granted. + */ +int security_inode_permission(struct inode *inode, int mask) +{ + if (unlikely(IS_PRIVATE(inode))) + return 0; + return call_int_hook(inode_permission, 0, inode, mask); +} + +/** + * security_inode_setattr() - Check if setting file attributes is allowed + * @idmap: idmap of the mount + * @dentry: file + * @attr: new attributes + * + * Check permission before setting file attributes. Note that the kernel call + * to notify_change is performed from several locations, whenever file + * attributes change (such as when a file is truncated, chown/chmod operations, + * transferring disk quotas, etc). + * + * Return: Returns 0 if permission is granted. + */ +int security_inode_setattr(struct mnt_idmap *idmap, + struct dentry *dentry, struct iattr *attr) +{ + int ret; + + if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) + return 0; + ret = call_int_hook(inode_setattr, 0, dentry, attr); + if (ret) + return ret; + return evm_inode_setattr(idmap, dentry, attr); +} +EXPORT_SYMBOL_GPL(security_inode_setattr); + +/** + * security_inode_getattr() - Check if getting file attributes is allowed + * @path: file + * + * Check permission before obtaining file attributes. + * + * Return: Returns 0 if permission is granted. + */ +int security_inode_getattr(const struct path *path) +{ + if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry)))) + return 0; + return call_int_hook(inode_getattr, 0, path); +} + +/** + * security_inode_setxattr() - Check if setting file xattrs is allowed + * @idmap: idmap of the mount + * @dentry: file + * @name: xattr name + * @value: xattr value + * @size: size of xattr value + * @flags: flags + * + * Check permission before setting the extended attributes. + * + * Return: Returns 0 if permission is granted. + */ +int security_inode_setxattr(struct mnt_idmap *idmap, + struct dentry *dentry, const char *name, + const void *value, size_t size, int flags) +{ + int ret; + + if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) + return 0; + /* + * SELinux and Smack integrate the cap call, + * so assume that all LSMs supplying this call do so. + */ + ret = call_int_hook(inode_setxattr, 1, idmap, dentry, name, value, + size, flags); + + if (ret == 1) + ret = cap_inode_setxattr(dentry, name, value, size, flags); + if (ret) + return ret; + ret = ima_inode_setxattr(dentry, name, value, size); + if (ret) + return ret; + return evm_inode_setxattr(idmap, dentry, name, value, size); +} + +/** + * security_inode_set_acl() - Check if setting posix acls is allowed + * @idmap: idmap of the mount + * @dentry: file + * @acl_name: acl name + * @kacl: acl struct + * + * Check permission before setting posix acls, the posix acls in @kacl are + * identified by @acl_name. + * + * Return: Returns 0 if permission is granted. + */ +int security_inode_set_acl(struct mnt_idmap *idmap, + struct dentry *dentry, const char *acl_name, + struct posix_acl *kacl) +{ + int ret; + + if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) + return 0; + ret = call_int_hook(inode_set_acl, 0, idmap, dentry, acl_name, + kacl); + if (ret) + return ret; + ret = ima_inode_set_acl(idmap, dentry, acl_name, kacl); + if (ret) + return ret; + return evm_inode_set_acl(idmap, dentry, acl_name, kacl); +} + +/** + * security_inode_get_acl() - Check if reading posix acls is allowed + * @idmap: idmap of the mount + * @dentry: file + * @acl_name: acl name + * + * Check permission before getting osix acls, the posix acls are identified by + * @acl_name. + * + * Return: Returns 0 if permission is granted. + */ +int security_inode_get_acl(struct mnt_idmap *idmap, + struct dentry *dentry, const char *acl_name) +{ + if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) + return 0; + return call_int_hook(inode_get_acl, 0, idmap, dentry, acl_name); +} + +/** + * security_inode_remove_acl() - Check if removing a posix acl is allowed + * @idmap: idmap of the mount + * @dentry: file + * @acl_name: acl name + * + * Check permission before removing posix acls, the posix acls are identified + * by @acl_name. + * + * Return: Returns 0 if permission is granted. + */ +int security_inode_remove_acl(struct mnt_idmap *idmap, + struct dentry *dentry, const char *acl_name) +{ + int ret; + + if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) + return 0; + ret = call_int_hook(inode_remove_acl, 0, idmap, dentry, acl_name); + if (ret) + return ret; + ret = ima_inode_remove_acl(idmap, dentry, acl_name); + if (ret) + return ret; + return evm_inode_remove_acl(idmap, dentry, acl_name); +} + +/** + * security_inode_post_setxattr() - Update the inode after a setxattr operation + * @dentry: file + * @name: xattr name + * @value: xattr value + * @size: xattr value size + * @flags: flags + * + * Update inode security field after successful setxattr operation. + */ +void security_inode_post_setxattr(struct dentry *dentry, const char *name, + const void *value, size_t size, int flags) +{ + if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) + return; + call_void_hook(inode_post_setxattr, dentry, name, value, size, flags); + evm_inode_post_setxattr(dentry, name, value, size); +} + +/** + * security_inode_getxattr() - Check if xattr access is allowed + * @dentry: file + * @name: xattr name + * + * Check permission before obtaining the extended attributes identified by + * @name for @dentry. + * + * Return: Returns 0 if permission is granted. + */ +int security_inode_getxattr(struct dentry *dentry, const char *name) +{ + if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) + return 0; + return call_int_hook(inode_getxattr, 0, dentry, name); +} + +/** + * security_inode_listxattr() - Check if listing xattrs is allowed + * @dentry: file + * + * Check permission before obtaining the list of extended attribute names for + * @dentry. + * + * Return: Returns 0 if permission is granted. + */ +int security_inode_listxattr(struct dentry *dentry) +{ + if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) + return 0; + return call_int_hook(inode_listxattr, 0, dentry); +} + +/** + * security_inode_removexattr() - Check if removing an xattr is allowed + * @idmap: idmap of the mount + * @dentry: file + * @name: xattr name + * + * Check permission before removing the extended attribute identified by @name + * for @dentry. + * + * Return: Returns 0 if permission is granted. + */ +int security_inode_removexattr(struct mnt_idmap *idmap, + struct dentry *dentry, const char *name) +{ + int ret; + + if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) + return 0; + /* + * SELinux and Smack integrate the cap call, + * so assume that all LSMs supplying this call do so. + */ + ret = call_int_hook(inode_removexattr, 1, idmap, dentry, name); + if (ret == 1) + ret = cap_inode_removexattr(idmap, dentry, name); + if (ret) + return ret; + ret = ima_inode_removexattr(dentry, name); + if (ret) + return ret; + return evm_inode_removexattr(idmap, dentry, name); +} + +/** + * security_inode_need_killpriv() - Check if security_inode_killpriv() required + * @dentry: associated dentry + * + * Called when an inode has been changed to determine if + * security_inode_killpriv() should be called. + * + * Return: Return <0 on error to abort the inode change operation, return 0 if + * security_inode_killpriv() does not need to be called, return >0 if + * security_inode_killpriv() does need to be called. + */ +int security_inode_need_killpriv(struct dentry *dentry) +{ + return call_int_hook(inode_need_killpriv, 0, dentry); +} + +/** + * security_inode_killpriv() - The setuid bit is removed, update LSM state + * @idmap: idmap of the mount + * @dentry: associated dentry + * + * The @dentry's setuid bit is being removed. Remove similar security labels. + * Called with the dentry->d_inode->i_mutex held. + * + * Return: Return 0 on success. If error is returned, then the operation + * causing setuid bit removal is failed. + */ +int security_inode_killpriv(struct mnt_idmap *idmap, + struct dentry *dentry) +{ + return call_int_hook(inode_killpriv, 0, idmap, dentry); +} + +/** + * security_inode_getsecurity() - Get the xattr security label of an inode + * @idmap: idmap of the mount + * @inode: inode + * @name: xattr name + * @buffer: security label buffer + * @alloc: allocation flag + * + * Retrieve a copy of the extended attribute representation of the security + * label associated with @name for @inode via @buffer. Note that @name is the + * remainder of the attribute name after the security prefix has been removed. + * @alloc is used to specify if the call should return a value via the buffer + * or just the value length. + * + * Return: Returns size of buffer on success. + */ +int security_inode_getsecurity(struct mnt_idmap *idmap, + struct inode *inode, const char *name, + void **buffer, bool alloc) +{ + struct security_hook_list *hp; + int rc; + + if (unlikely(IS_PRIVATE(inode))) + return LSM_RET_DEFAULT(inode_getsecurity); + /* + * Only one module will provide an attribute with a given name. + */ + hlist_for_each_entry(hp, &security_hook_heads.inode_getsecurity, list) { + rc = hp->hook.inode_getsecurity(idmap, inode, name, buffer, + alloc); + if (rc != LSM_RET_DEFAULT(inode_getsecurity)) + return rc; + } + return LSM_RET_DEFAULT(inode_getsecurity); +} + +/** + * security_inode_setsecurity() - Set the xattr security label of an inode + * @inode: inode + * @name: xattr name + * @value: security label + * @size: length of security label + * @flags: flags + * + * Set the security label associated with @name for @inode from the extended + * attribute value @value. @size indicates the size of the @value in bytes. + * @flags may be XATTR_CREATE, XATTR_REPLACE, or 0. Note that @name is the + * remainder of the attribute name after the security. prefix has been removed. + * + * Return: Returns 0 on success. + */ +int security_inode_setsecurity(struct inode *inode, const char *name, + const void *value, size_t size, int flags) +{ + struct security_hook_list *hp; + int rc; + + if (unlikely(IS_PRIVATE(inode))) + return LSM_RET_DEFAULT(inode_setsecurity); + /* + * Only one module will provide an attribute with a given name. + */ + hlist_for_each_entry(hp, &security_hook_heads.inode_setsecurity, list) { + rc = hp->hook.inode_setsecurity(inode, name, value, size, + flags); + if (rc != LSM_RET_DEFAULT(inode_setsecurity)) + return rc; + } + return LSM_RET_DEFAULT(inode_setsecurity); +} + +/** + * security_inode_listsecurity() - List the xattr security label names + * @inode: inode + * @buffer: buffer + * @buffer_size: size of buffer + * + * Copy the extended attribute names for the security labels associated with + * @inode into @buffer. The maximum size of @buffer is specified by + * @buffer_size. @buffer may be NULL to request the size of the buffer + * required. + * + * Return: Returns number of bytes used/required on success. + */ +int security_inode_listsecurity(struct inode *inode, + char *buffer, size_t buffer_size) +{ + if (unlikely(IS_PRIVATE(inode))) + return 0; + return call_int_hook(inode_listsecurity, 0, inode, buffer, buffer_size); +} +EXPORT_SYMBOL(security_inode_listsecurity); + +/** + * security_inode_getsecid() - Get an inode's secid + * @inode: inode + * @secid: secid to return + * + * Get the secid associated with the node. In case of failure, @secid will be + * set to zero. + */ +void security_inode_getsecid(struct inode *inode, u32 *secid) +{ + call_void_hook(inode_getsecid, inode, secid); +} + +/** + * security_inode_copy_up() - Create new creds for an overlayfs copy-up op + * @src: union dentry of copy-up file + * @new: newly created creds + * + * A file is about to be copied up from lower layer to upper layer of overlay + * filesystem. Security module can prepare a set of new creds and modify as + * need be and return new creds. Caller will switch to new creds temporarily to + * create new file and release newly allocated creds. + * + * Return: Returns 0 on success or a negative error code on error. + */ +int security_inode_copy_up(struct dentry *src, struct cred **new) +{ + return call_int_hook(inode_copy_up, 0, src, new); +} +EXPORT_SYMBOL(security_inode_copy_up); + +/** + * security_inode_copy_up_xattr() - Filter xattrs in an overlayfs copy-up op + * @name: xattr name + * + * Filter the xattrs being copied up when a unioned file is copied up from a + * lower layer to the union/overlay layer. The caller is responsible for + * reading and writing the xattrs, this hook is merely a filter. + * + * Return: Returns 0 to accept the xattr, 1 to discard the xattr, -EOPNOTSUPP + * if the security module does not know about attribute, or a negative + * error code to abort the copy up. + */ +int security_inode_copy_up_xattr(const char *name) +{ + struct security_hook_list *hp; + int rc; + + /* + * The implementation can return 0 (accept the xattr), 1 (discard the + * xattr), -EOPNOTSUPP if it does not know anything about the xattr or + * any other error code in case of an error. + */ + hlist_for_each_entry(hp, + &security_hook_heads.inode_copy_up_xattr, list) { + rc = hp->hook.inode_copy_up_xattr(name); + if (rc != LSM_RET_DEFAULT(inode_copy_up_xattr)) + return rc; + } + + return LSM_RET_DEFAULT(inode_copy_up_xattr); +} +EXPORT_SYMBOL(security_inode_copy_up_xattr); + +/** + * security_kernfs_init_security() - Init LSM context for a kernfs node + * @kn_dir: parent kernfs node + * @kn: the kernfs node to initialize + * + * Initialize the security context of a newly created kernfs node based on its + * own and its parent's attributes. + * + * Return: Returns 0 if permission is granted. + */ +int security_kernfs_init_security(struct kernfs_node *kn_dir, + struct kernfs_node *kn) +{ + return call_int_hook(kernfs_init_security, 0, kn_dir, kn); +} + +/** + * security_file_permission() - Check file permissions + * @file: file + * @mask: requested permissions + * + * Check file permissions before accessing an open file. This hook is called + * by various operations that read or write files. A security module can use + * this hook to perform additional checking on these operations, e.g. to + * revalidate permissions on use to support privilege bracketing or policy + * changes. Notice that this hook is used when the actual read/write + * operations are performed, whereas the inode_security_ops hook is called when + * a file is opened (as well as many other operations). Although this hook can + * be used to revalidate permissions for various system call operations that + * read or write files, it does not address the revalidation of permissions for + * memory-mapped files. Security modules must handle this separately if they + * need such revalidation. + * + * Return: Returns 0 if permission is granted. + */ +int security_file_permission(struct file *file, int mask) +{ + int ret; + + ret = call_int_hook(file_permission, 0, file, mask); + if (ret) + return ret; + + return fsnotify_perm(file, mask); +} + +/** + * security_file_alloc() - Allocate and init a file's LSM blob + * @file: the file + * + * Allocate and attach a security structure to the file->f_security field. The + * security field is initialized to NULL when the structure is first created. + * + * Return: Return 0 if the hook is successful and permission is granted. + */ +int security_file_alloc(struct file *file) +{ + int rc = lsm_file_alloc(file); + + if (rc) + return rc; + rc = call_int_hook(file_alloc_security, 0, file); + if (unlikely(rc)) + security_file_free(file); + return rc; +} + +/** + * security_file_free() - Free a file's LSM blob + * @file: the file + * + * Deallocate and free any security structures stored in file->f_security. + */ +void security_file_free(struct file *file) +{ + void *blob; + + call_void_hook(file_free_security, file); + + blob = file->f_security; + if (blob) { + file->f_security = NULL; + kmem_cache_free(lsm_file_cache, blob); + } +} + +/** + * security_file_ioctl() - Check if an ioctl is allowed + * @file: associated file + * @cmd: ioctl cmd + * @arg: ioctl arguments + * + * Check permission for an ioctl operation on @file. Note that @arg sometimes + * represents a user space pointer; in other cases, it may be a simple integer + * value. When @arg represents a user space pointer, it should never be used + * by the security module. + * + * Return: Returns 0 if permission is granted. + */ +int security_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + return call_int_hook(file_ioctl, 0, file, cmd, arg); +} +EXPORT_SYMBOL_GPL(security_file_ioctl); + +/** + * security_file_ioctl_compat() - Check if an ioctl is allowed in compat mode + * @file: associated file + * @cmd: ioctl cmd + * @arg: ioctl arguments + * + * Compat version of security_file_ioctl() that correctly handles 32-bit + * processes running on 64-bit kernels. + * + * Return: Returns 0 if permission is granted. + */ +int security_file_ioctl_compat(struct file *file, unsigned int cmd, + unsigned long arg) +{ + return call_int_hook(file_ioctl_compat, 0, file, cmd, arg); +} +EXPORT_SYMBOL_GPL(security_file_ioctl_compat); + +static inline unsigned long mmap_prot(struct file *file, unsigned long prot) +{ + /* + * Does we have PROT_READ and does the application expect + * it to imply PROT_EXEC? If not, nothing to talk about... + */ + if ((prot & (PROT_READ | PROT_EXEC)) != PROT_READ) + return prot; + if (!(current->personality & READ_IMPLIES_EXEC)) + return prot; + /* + * if that's an anonymous mapping, let it. + */ + if (!file) + return prot | PROT_EXEC; + /* + * ditto if it's not on noexec mount, except that on !MMU we need + * NOMMU_MAP_EXEC (== VM_MAYEXEC) in this case + */ + if (!path_noexec(&file->f_path)) { +#ifndef CONFIG_MMU + if (file->f_op->mmap_capabilities) { + unsigned caps = file->f_op->mmap_capabilities(file); + if (!(caps & NOMMU_MAP_EXEC)) + return prot; + } +#endif + return prot | PROT_EXEC; + } + /* anything on noexec mount won't get PROT_EXEC */ + return prot; +} + +/** + * security_mmap_file() - Check if mmap'ing a file is allowed + * @file: file + * @prot: protection applied by the kernel + * @flags: flags + * + * Check permissions for a mmap operation. The @file may be NULL, e.g. if + * mapping anonymous memory. + * + * Return: Returns 0 if permission is granted. + */ +int security_mmap_file(struct file *file, unsigned long prot, + unsigned long flags) +{ + unsigned long prot_adj = mmap_prot(file, prot); + int ret; + + ret = call_int_hook(mmap_file, 0, file, prot, prot_adj, flags); + if (ret) + return ret; + return ima_file_mmap(file, prot, prot_adj, flags); +} + +/** + * security_mmap_addr() - Check if mmap'ing an address is allowed + * @addr: address + * + * Check permissions for a mmap operation at @addr. + * + * Return: Returns 0 if permission is granted. + */ +int security_mmap_addr(unsigned long addr) +{ + return call_int_hook(mmap_addr, 0, addr); +} + +/** + * security_file_mprotect() - Check if changing memory protections is allowed + * @vma: memory region + * @reqprot: application requested protection + * @prot: protection applied by the kernel + * + * Check permissions before changing memory access permissions. + * + * Return: Returns 0 if permission is granted. + */ +int security_file_mprotect(struct vm_area_struct *vma, unsigned long reqprot, + unsigned long prot) +{ + int ret; + + ret = call_int_hook(file_mprotect, 0, vma, reqprot, prot); + if (ret) + return ret; + return ima_file_mprotect(vma, prot); +} + +/** + * security_file_lock() - Check if a file lock is allowed + * @file: file + * @cmd: lock operation (e.g. F_RDLCK, F_WRLCK) + * + * Check permission before performing file locking operations. Note the hook + * mediates both flock and fcntl style locks. + * + * Return: Returns 0 if permission is granted. + */ +int security_file_lock(struct file *file, unsigned int cmd) +{ + return call_int_hook(file_lock, 0, file, cmd); +} + +/** + * security_file_fcntl() - Check if fcntl() op is allowed + * @file: file + * @cmd: fcntl command + * @arg: command argument + * + * Check permission before allowing the file operation specified by @cmd from + * being performed on the file @file. Note that @arg sometimes represents a + * user space pointer; in other cases, it may be a simple integer value. When + * @arg represents a user space pointer, it should never be used by the + * security module. + * + * Return: Returns 0 if permission is granted. + */ +int security_file_fcntl(struct file *file, unsigned int cmd, unsigned long arg) +{ + return call_int_hook(file_fcntl, 0, file, cmd, arg); +} + +/** + * security_file_set_fowner() - Set the file owner info in the LSM blob + * @file: the file + * + * Save owner security information (typically from current->security) in + * file->f_security for later use by the send_sigiotask hook. + * + * Return: Returns 0 on success. + */ +void security_file_set_fowner(struct file *file) +{ + call_void_hook(file_set_fowner, file); +} + +/** + * security_file_send_sigiotask() - Check if sending SIGIO/SIGURG is allowed + * @tsk: target task + * @fown: signal sender + * @sig: signal to be sent, SIGIO is sent if 0 + * + * Check permission for the file owner @fown to send SIGIO or SIGURG to the + * process @tsk. Note that this hook is sometimes called from interrupt. Note + * that the fown_struct, @fown, is never outside the context of a struct file, + * so the file structure (and associated security information) can always be + * obtained: container_of(fown, struct file, f_owner). + * + * Return: Returns 0 if permission is granted. + */ +int security_file_send_sigiotask(struct task_struct *tsk, + struct fown_struct *fown, int sig) +{ + return call_int_hook(file_send_sigiotask, 0, tsk, fown, sig); +} + +/** + * security_file_receive() - Check is receiving a file via IPC is allowed + * @file: file being received + * + * This hook allows security modules to control the ability of a process to + * receive an open file descriptor via socket IPC. + * + * Return: Returns 0 if permission is granted. + */ +int security_file_receive(struct file *file) +{ + return call_int_hook(file_receive, 0, file); +} + +/** + * security_file_open() - Save open() time state for late use by the LSM + * @file: + * + * Save open-time permission checking state for later use upon file_permission, + * and recheck access if anything has changed since inode_permission. + * + * Return: Returns 0 if permission is granted. + */ +int security_file_open(struct file *file) +{ + int ret; + + ret = call_int_hook(file_open, 0, file); + if (ret) + return ret; + + return fsnotify_perm(file, MAY_OPEN); +} + +/** + * security_file_truncate() - Check if truncating a file is allowed + * @file: file + * + * Check permission before truncating a file, i.e. using ftruncate. Note that + * truncation permission may also be checked based on the path, using the + * @path_truncate hook. + * + * Return: Returns 0 if permission is granted. + */ +int security_file_truncate(struct file *file) +{ + return call_int_hook(file_truncate, 0, file); +} + +/** + * security_task_alloc() - Allocate a task's LSM blob + * @task: the task + * @clone_flags: flags indicating what is being shared + * + * Handle allocation of task-related resources. + * + * Return: Returns a zero on success, negative values on failure. + */ +int security_task_alloc(struct task_struct *task, unsigned long clone_flags) +{ + int rc = lsm_task_alloc(task); + + if (rc) + return rc; + rc = call_int_hook(task_alloc, 0, task, clone_flags); + if (unlikely(rc)) + security_task_free(task); + return rc; +} + +/** + * security_task_free() - Free a task's LSM blob and related resources + * @task: task + * + * Handle release of task-related resources. Note that this can be called from + * interrupt context. + */ +void security_task_free(struct task_struct *task) +{ + call_void_hook(task_free, task); + + kfree(task->security); + task->security = NULL; +} + +/** + * security_cred_alloc_blank() - Allocate the min memory to allow cred_transfer + * @cred: credentials + * @gfp: gfp flags + * + * Only allocate sufficient memory and attach to @cred such that + * cred_transfer() will not get ENOMEM. + * + * Return: Returns 0 on success, negative values on failure. + */ +int security_cred_alloc_blank(struct cred *cred, gfp_t gfp) +{ + int rc = lsm_cred_alloc(cred, gfp); + + if (rc) + return rc; + + rc = call_int_hook(cred_alloc_blank, 0, cred, gfp); + if (unlikely(rc)) + security_cred_free(cred); + return rc; +} + +/** + * security_cred_free() - Free the cred's LSM blob and associated resources + * @cred: credentials + * + * Deallocate and clear the cred->security field in a set of credentials. + */ +void security_cred_free(struct cred *cred) +{ + /* + * There is a failure case in prepare_creds() that + * may result in a call here with ->security being NULL. + */ + if (unlikely(cred->security == NULL)) + return; + + call_void_hook(cred_free, cred); + + kfree(cred->security); + cred->security = NULL; +} + +/** + * security_prepare_creds() - Prepare a new set of credentials + * @new: new credentials + * @old: original credentials + * @gfp: gfp flags + * + * Prepare a new set of credentials by copying the data from the old set. + * + * Return: Returns 0 on success, negative values on failure. + */ +int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t gfp) +{ + int rc = lsm_cred_alloc(new, gfp); + + if (rc) + return rc; + + rc = call_int_hook(cred_prepare, 0, new, old, gfp); + if (unlikely(rc)) + security_cred_free(new); + return rc; +} + +/** + * security_transfer_creds() - Transfer creds + * @new: target credentials + * @old: original credentials + * + * Transfer data from original creds to new creds. + */ +void security_transfer_creds(struct cred *new, const struct cred *old) +{ + call_void_hook(cred_transfer, new, old); +} + +/** + * security_cred_getsecid() - Get the secid from a set of credentials + * @c: credentials + * @secid: secid value + * + * Retrieve the security identifier of the cred structure @c. In case of + * failure, @secid will be set to zero. + */ +void security_cred_getsecid(const struct cred *c, u32 *secid) +{ + *secid = 0; + call_void_hook(cred_getsecid, c, secid); +} +EXPORT_SYMBOL(security_cred_getsecid); + +/** + * security_kernel_act_as() - Set the kernel credentials to act as secid + * @new: credentials + * @secid: secid + * + * Set the credentials for a kernel service to act as (subjective context). + * The current task must be the one that nominated @secid. + * + * Return: Returns 0 if successful. + */ +int security_kernel_act_as(struct cred *new, u32 secid) +{ + return call_int_hook(kernel_act_as, 0, new, secid); +} + +/** + * security_kernel_create_files_as() - Set file creation context using an inode + * @new: target credentials + * @inode: reference inode + * + * Set the file creation context in a set of credentials to be the same as the + * objective context of the specified inode. The current task must be the one + * that nominated @inode. + * + * Return: Returns 0 if successful. + */ +int security_kernel_create_files_as(struct cred *new, struct inode *inode) +{ + return call_int_hook(kernel_create_files_as, 0, new, inode); +} + +/** + * security_kernel_module_request() - Check is loading a module is allowed + * @kmod_name: module name + * + * Ability to trigger the kernel to automatically upcall to userspace for + * userspace to load a kernel module with the given name. + * + * Return: Returns 0 if successful. + */ +int security_kernel_module_request(char *kmod_name) +{ + int ret; + + ret = call_int_hook(kernel_module_request, 0, kmod_name); + if (ret) + return ret; + return integrity_kernel_module_request(kmod_name); +} + +/** + * security_kernel_read_file() - Read a file specified by userspace + * @file: file + * @id: file identifier + * @contents: trust if security_kernel_post_read_file() will be called + * + * Read a file specified by userspace. + * + * Return: Returns 0 if permission is granted. + */ +int security_kernel_read_file(struct file *file, enum kernel_read_file_id id, + bool contents) +{ + int ret; + + ret = call_int_hook(kernel_read_file, 0, file, id, contents); + if (ret) + return ret; + return ima_read_file(file, id, contents); +} +EXPORT_SYMBOL_GPL(security_kernel_read_file); + +/** + * security_kernel_post_read_file() - Read a file specified by userspace + * @file: file + * @buf: file contents + * @size: size of file contents + * @id: file identifier + * + * Read a file specified by userspace. This must be paired with a prior call + * to security_kernel_read_file() call that indicated this hook would also be + * called, see security_kernel_read_file() for more information. + * + * Return: Returns 0 if permission is granted. + */ +int security_kernel_post_read_file(struct file *file, char *buf, loff_t size, + enum kernel_read_file_id id) +{ + int ret; + + ret = call_int_hook(kernel_post_read_file, 0, file, buf, size, id); + if (ret) + return ret; + return ima_post_read_file(file, buf, size, id); +} +EXPORT_SYMBOL_GPL(security_kernel_post_read_file); + +/** + * security_kernel_load_data() - Load data provided by userspace + * @id: data identifier + * @contents: true if security_kernel_post_load_data() will be called + * + * Load data provided by userspace. + * + * Return: Returns 0 if permission is granted. + */ +int security_kernel_load_data(enum kernel_load_data_id id, bool contents) +{ + int ret; + + ret = call_int_hook(kernel_load_data, 0, id, contents); + if (ret) + return ret; + return ima_load_data(id, contents); +} +EXPORT_SYMBOL_GPL(security_kernel_load_data); + +/** + * security_kernel_post_load_data() - Load userspace data from a non-file source + * @buf: data + * @size: size of data + * @id: data identifier + * @description: text description of data, specific to the id value + * + * Load data provided by a non-file source (usually userspace buffer). This + * must be paired with a prior security_kernel_load_data() call that indicated + * this hook would also be called, see security_kernel_load_data() for more + * information. + * + * Return: Returns 0 if permission is granted. + */ +int security_kernel_post_load_data(char *buf, loff_t size, + enum kernel_load_data_id id, + char *description) +{ + int ret; + + ret = call_int_hook(kernel_post_load_data, 0, buf, size, id, + description); + if (ret) + return ret; + return ima_post_load_data(buf, size, id, description); +} +EXPORT_SYMBOL_GPL(security_kernel_post_load_data); + +/** + * security_task_fix_setuid() - Update LSM with new user id attributes + * @new: updated credentials + * @old: credentials being replaced + * @flags: LSM_SETID_* flag values + * + * Update the module's state after setting one or more of the user identity + * attributes of the current process. The @flags parameter indicates which of + * the set*uid system calls invoked this hook. If @new is the set of + * credentials that will be installed. Modifications should be made to this + * rather than to @current->cred. + * + * Return: Returns 0 on success. + */ +int security_task_fix_setuid(struct cred *new, const struct cred *old, + int flags) +{ + return call_int_hook(task_fix_setuid, 0, new, old, flags); +} + +/** + * security_task_fix_setgid() - Update LSM with new group id attributes + * @new: updated credentials + * @old: credentials being replaced + * @flags: LSM_SETID_* flag value + * + * Update the module's state after setting one or more of the group identity + * attributes of the current process. The @flags parameter indicates which of + * the set*gid system calls invoked this hook. @new is the set of credentials + * that will be installed. Modifications should be made to this rather than to + * @current->cred. + * + * Return: Returns 0 on success. + */ +int security_task_fix_setgid(struct cred *new, const struct cred *old, + int flags) +{ + return call_int_hook(task_fix_setgid, 0, new, old, flags); +} + +/** + * security_task_fix_setgroups() - Update LSM with new supplementary groups + * @new: updated credentials + * @old: credentials being replaced + * + * Update the module's state after setting the supplementary group identity + * attributes of the current process. @new is the set of credentials that will + * be installed. Modifications should be made to this rather than to + * @current->cred. + * + * Return: Returns 0 on success. + */ +int security_task_fix_setgroups(struct cred *new, const struct cred *old) +{ + return call_int_hook(task_fix_setgroups, 0, new, old); +} + +/** + * security_task_setpgid() - Check if setting the pgid is allowed + * @p: task being modified + * @pgid: new pgid + * + * Check permission before setting the process group identifier of the process + * @p to @pgid. + * + * Return: Returns 0 if permission is granted. + */ +int security_task_setpgid(struct task_struct *p, pid_t pgid) +{ + return call_int_hook(task_setpgid, 0, p, pgid); +} + +/** + * security_task_getpgid() - Check if getting the pgid is allowed + * @p: task + * + * Check permission before getting the process group identifier of the process + * @p. + * + * Return: Returns 0 if permission is granted. + */ +int security_task_getpgid(struct task_struct *p) +{ + return call_int_hook(task_getpgid, 0, p); +} + +/** + * security_task_getsid() - Check if getting the session id is allowed + * @p: task + * + * Check permission before getting the session identifier of the process @p. + * + * Return: Returns 0 if permission is granted. + */ +int security_task_getsid(struct task_struct *p) +{ + return call_int_hook(task_getsid, 0, p); +} + +/** + * security_current_getsecid_subj() - Get the current task's subjective secid + * @secid: secid value + * + * Retrieve the subjective security identifier of the current task and return + * it in @secid. In case of failure, @secid will be set to zero. + */ +void security_current_getsecid_subj(u32 *secid) +{ + *secid = 0; + call_void_hook(current_getsecid_subj, secid); +} +EXPORT_SYMBOL(security_current_getsecid_subj); + +/** + * security_task_getsecid_obj() - Get a task's objective secid + * @p: target task + * @secid: secid value + * + * Retrieve the objective security identifier of the task_struct in @p and + * return it in @secid. In case of failure, @secid will be set to zero. + */ +void security_task_getsecid_obj(struct task_struct *p, u32 *secid) +{ + *secid = 0; + call_void_hook(task_getsecid_obj, p, secid); +} +EXPORT_SYMBOL(security_task_getsecid_obj); + +/** + * security_task_setnice() - Check if setting a task's nice value is allowed + * @p: target task + * @nice: nice value + * + * Check permission before setting the nice value of @p to @nice. + * + * Return: Returns 0 if permission is granted. + */ +int security_task_setnice(struct task_struct *p, int nice) +{ + return call_int_hook(task_setnice, 0, p, nice); +} + +/** + * security_task_setioprio() - Check if setting a task's ioprio is allowed + * @p: target task + * @ioprio: ioprio value + * + * Check permission before setting the ioprio value of @p to @ioprio. + * + * Return: Returns 0 if permission is granted. + */ +int security_task_setioprio(struct task_struct *p, int ioprio) +{ + return call_int_hook(task_setioprio, 0, p, ioprio); +} + +/** + * security_task_getioprio() - Check if getting a task's ioprio is allowed + * @p: task + * + * Check permission before getting the ioprio value of @p. + * + * Return: Returns 0 if permission is granted. + */ +int security_task_getioprio(struct task_struct *p) +{ + return call_int_hook(task_getioprio, 0, p); +} + +/** + * security_task_prlimit() - Check if get/setting resources limits is allowed + * @cred: current task credentials + * @tcred: target task credentials + * @flags: LSM_PRLIMIT_* flag bits indicating a get/set/both + * + * Check permission before getting and/or setting the resource limits of + * another task. + * + * Return: Returns 0 if permission is granted. + */ +int security_task_prlimit(const struct cred *cred, const struct cred *tcred, + unsigned int flags) +{ + return call_int_hook(task_prlimit, 0, cred, tcred, flags); +} + +/** + * security_task_setrlimit() - Check if setting a new rlimit value is allowed + * @p: target task's group leader + * @resource: resource whose limit is being set + * @new_rlim: new resource limit + * + * Check permission before setting the resource limits of process @p for + * @resource to @new_rlim. The old resource limit values can be examined by + * dereferencing (p->signal->rlim + resource). + * + * Return: Returns 0 if permission is granted. + */ +int security_task_setrlimit(struct task_struct *p, unsigned int resource, + struct rlimit *new_rlim) +{ + return call_int_hook(task_setrlimit, 0, p, resource, new_rlim); +} + +/** + * security_task_setscheduler() - Check if setting sched policy/param is allowed + * @p: target task + * + * Check permission before setting scheduling policy and/or parameters of + * process @p. + * + * Return: Returns 0 if permission is granted. + */ +int security_task_setscheduler(struct task_struct *p) +{ + return call_int_hook(task_setscheduler, 0, p); +} + +/** + * security_task_getscheduler() - Check if getting scheduling info is allowed + * @p: target task + * + * Check permission before obtaining scheduling information for process @p. + * + * Return: Returns 0 if permission is granted. + */ +int security_task_getscheduler(struct task_struct *p) +{ + return call_int_hook(task_getscheduler, 0, p); +} + +/** + * security_task_movememory() - Check if moving memory is allowed + * @p: task + * + * Check permission before moving memory owned by process @p. + * + * Return: Returns 0 if permission is granted. + */ +int security_task_movememory(struct task_struct *p) +{ + return call_int_hook(task_movememory, 0, p); +} + +/** + * security_task_kill() - Check if sending a signal is allowed + * @p: target process + * @info: signal information + * @sig: signal value + * @cred: credentials of the signal sender, NULL if @current + * + * Check permission before sending signal @sig to @p. @info can be NULL, the + * constant 1, or a pointer to a kernel_siginfo structure. If @info is 1 or + * SI_FROMKERNEL(info) is true, then the signal should be viewed as coming from + * the kernel and should typically be permitted. SIGIO signals are handled + * separately by the send_sigiotask hook in file_security_ops. + * + * Return: Returns 0 if permission is granted. + */ +int security_task_kill(struct task_struct *p, struct kernel_siginfo *info, + int sig, const struct cred *cred) +{ + return call_int_hook(task_kill, 0, p, info, sig, cred); +} + +/** + * security_task_prctl() - Check if a prctl op is allowed + * @option: operation + * @arg2: argument + * @arg3: argument + * @arg4: argument + * @arg5: argument + * + * Check permission before performing a process control operation on the + * current process. + * + * Return: Return -ENOSYS if no-one wanted to handle this op, any other value + * to cause prctl() to return immediately with that value. + */ +int security_task_prctl(int option, unsigned long arg2, unsigned long arg3, + unsigned long arg4, unsigned long arg5) +{ + int thisrc; + int rc = LSM_RET_DEFAULT(task_prctl); + struct security_hook_list *hp; + + hlist_for_each_entry(hp, &security_hook_heads.task_prctl, list) { + thisrc = hp->hook.task_prctl(option, arg2, arg3, arg4, arg5); + if (thisrc != LSM_RET_DEFAULT(task_prctl)) { + rc = thisrc; + if (thisrc != 0) + break; + } + } + return rc; +} + +/** + * security_task_to_inode() - Set the security attributes of a task's inode + * @p: task + * @inode: inode + * + * Set the security attributes for an inode based on an associated task's + * security attributes, e.g. for /proc/pid inodes. + */ +void security_task_to_inode(struct task_struct *p, struct inode *inode) +{ + call_void_hook(task_to_inode, p, inode); +} + +/** + * security_create_user_ns() - Check if creating a new userns is allowed + * @cred: prepared creds + * + * Check permission prior to creating a new user namespace. + * + * Return: Returns 0 if successful, otherwise < 0 error code. + */ +int security_create_user_ns(const struct cred *cred) +{ + return call_int_hook(userns_create, 0, cred); +} + +/** + * security_ipc_permission() - Check if sysv ipc access is allowed + * @ipcp: ipc permission structure + * @flag: requested permissions + * + * Check permissions for access to IPC. + * + * Return: Returns 0 if permission is granted. + */ +int security_ipc_permission(struct kern_ipc_perm *ipcp, short flag) +{ + return call_int_hook(ipc_permission, 0, ipcp, flag); +} + +/** + * security_ipc_getsecid() - Get the sysv ipc object's secid + * @ipcp: ipc permission structure + * @secid: secid pointer + * + * Get the secid associated with the ipc object. In case of failure, @secid + * will be set to zero. + */ +void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid) +{ + *secid = 0; + call_void_hook(ipc_getsecid, ipcp, secid); +} + +/** + * security_msg_msg_alloc() - Allocate a sysv ipc message LSM blob + * @msg: message structure + * + * Allocate and attach a security structure to the msg->security field. The + * security field is initialized to NULL when the structure is first created. + * + * Return: Return 0 if operation was successful and permission is granted. + */ +int security_msg_msg_alloc(struct msg_msg *msg) +{ + int rc = lsm_msg_msg_alloc(msg); + + if (unlikely(rc)) + return rc; + rc = call_int_hook(msg_msg_alloc_security, 0, msg); + if (unlikely(rc)) + security_msg_msg_free(msg); + return rc; +} + +/** + * security_msg_msg_free() - Free a sysv ipc message LSM blob + * @msg: message structure + * + * Deallocate the security structure for this message. + */ +void security_msg_msg_free(struct msg_msg *msg) +{ + call_void_hook(msg_msg_free_security, msg); + kfree(msg->security); + msg->security = NULL; +} + +/** + * security_msg_queue_alloc() - Allocate a sysv ipc msg queue LSM blob + * @msq: sysv ipc permission structure + * + * Allocate and attach a security structure to @msg. The security field is + * initialized to NULL when the structure is first created. + * + * Return: Returns 0 if operation was successful and permission is granted. + */ +int security_msg_queue_alloc(struct kern_ipc_perm *msq) +{ + int rc = lsm_ipc_alloc(msq); + + if (unlikely(rc)) + return rc; + rc = call_int_hook(msg_queue_alloc_security, 0, msq); + if (unlikely(rc)) + security_msg_queue_free(msq); + return rc; +} + +/** + * security_msg_queue_free() - Free a sysv ipc msg queue LSM blob + * @msq: sysv ipc permission structure + * + * Deallocate security field @perm->security for the message queue. + */ +void security_msg_queue_free(struct kern_ipc_perm *msq) +{ + call_void_hook(msg_queue_free_security, msq); + kfree(msq->security); + msq->security = NULL; +} + +/** + * security_msg_queue_associate() - Check if a msg queue operation is allowed + * @msq: sysv ipc permission structure + * @msqflg: operation flags + * + * Check permission when a message queue is requested through the msgget system + * call. This hook is only called when returning the message queue identifier + * for an existing message queue, not when a new message queue is created. + * + * Return: Return 0 if permission is granted. + */ +int security_msg_queue_associate(struct kern_ipc_perm *msq, int msqflg) +{ + return call_int_hook(msg_queue_associate, 0, msq, msqflg); +} + +/** + * security_msg_queue_msgctl() - Check if a msg queue operation is allowed + * @msq: sysv ipc permission structure + * @cmd: operation + * + * Check permission when a message control operation specified by @cmd is to be + * performed on the message queue with permissions. + * + * Return: Returns 0 if permission is granted. + */ +int security_msg_queue_msgctl(struct kern_ipc_perm *msq, int cmd) +{ + return call_int_hook(msg_queue_msgctl, 0, msq, cmd); +} + +/** + * security_msg_queue_msgsnd() - Check if sending a sysv ipc message is allowed + * @msq: sysv ipc permission structure + * @msg: message + * @msqflg: operation flags + * + * Check permission before a message, @msg, is enqueued on the message queue + * with permissions specified in @msq. + * + * Return: Returns 0 if permission is granted. + */ +int security_msg_queue_msgsnd(struct kern_ipc_perm *msq, + struct msg_msg *msg, int msqflg) +{ + return call_int_hook(msg_queue_msgsnd, 0, msq, msg, msqflg); +} + +/** + * security_msg_queue_msgrcv() - Check if receiving a sysv ipc msg is allowed + * @msq: sysv ipc permission structure + * @msg: message + * @target: target task + * @type: type of message requested + * @mode: operation flags + * + * Check permission before a message, @msg, is removed from the message queue. + * The @target task structure contains a pointer to the process that will be + * receiving the message (not equal to the current process when inline receives + * are being performed). + * + * Return: Returns 0 if permission is granted. + */ +int security_msg_queue_msgrcv(struct kern_ipc_perm *msq, struct msg_msg *msg, + struct task_struct *target, long type, int mode) +{ + return call_int_hook(msg_queue_msgrcv, 0, msq, msg, target, type, mode); +} + +/** + * security_shm_alloc() - Allocate a sysv shm LSM blob + * @shp: sysv ipc permission structure + * + * Allocate and attach a security structure to the @shp security field. The + * security field is initialized to NULL when the structure is first created. + * + * Return: Returns 0 if operation was successful and permission is granted. + */ +int security_shm_alloc(struct kern_ipc_perm *shp) +{ + int rc = lsm_ipc_alloc(shp); + + if (unlikely(rc)) + return rc; + rc = call_int_hook(shm_alloc_security, 0, shp); + if (unlikely(rc)) + security_shm_free(shp); + return rc; +} + +/** + * security_shm_free() - Free a sysv shm LSM blob + * @shp: sysv ipc permission structure + * + * Deallocate the security structure @perm->security for the memory segment. + */ +void security_shm_free(struct kern_ipc_perm *shp) +{ + call_void_hook(shm_free_security, shp); + kfree(shp->security); + shp->security = NULL; +} + +/** + * security_shm_associate() - Check if a sysv shm operation is allowed + * @shp: sysv ipc permission structure + * @shmflg: operation flags + * + * Check permission when a shared memory region is requested through the shmget + * system call. This hook is only called when returning the shared memory + * region identifier for an existing region, not when a new shared memory + * region is created. + * + * Return: Returns 0 if permission is granted. + */ +int security_shm_associate(struct kern_ipc_perm *shp, int shmflg) +{ + return call_int_hook(shm_associate, 0, shp, shmflg); +} + +/** + * security_shm_shmctl() - Check if a sysv shm operation is allowed + * @shp: sysv ipc permission structure + * @cmd: operation + * + * Check permission when a shared memory control operation specified by @cmd is + * to be performed on the shared memory region with permissions in @shp. + * + * Return: Return 0 if permission is granted. + */ +int security_shm_shmctl(struct kern_ipc_perm *shp, int cmd) +{ + return call_int_hook(shm_shmctl, 0, shp, cmd); +} + +/** + * security_shm_shmat() - Check if a sysv shm attach operation is allowed + * @shp: sysv ipc permission structure + * @shmaddr: address of memory region to attach + * @shmflg: operation flags + * + * Check permissions prior to allowing the shmat system call to attach the + * shared memory segment with permissions @shp to the data segment of the + * calling process. The attaching address is specified by @shmaddr. + * + * Return: Returns 0 if permission is granted. + */ +int security_shm_shmat(struct kern_ipc_perm *shp, + char __user *shmaddr, int shmflg) +{ + return call_int_hook(shm_shmat, 0, shp, shmaddr, shmflg); +} + +/** + * security_sem_alloc() - Allocate a sysv semaphore LSM blob + * @sma: sysv ipc permission structure + * + * Allocate and attach a security structure to the @sma security field. The + * security field is initialized to NULL when the structure is first created. + * + * Return: Returns 0 if operation was successful and permission is granted. + */ +int security_sem_alloc(struct kern_ipc_perm *sma) +{ + int rc = lsm_ipc_alloc(sma); + + if (unlikely(rc)) + return rc; + rc = call_int_hook(sem_alloc_security, 0, sma); + if (unlikely(rc)) + security_sem_free(sma); + return rc; +} + +/** + * security_sem_free() - Free a sysv semaphore LSM blob + * @sma: sysv ipc permission structure + * + * Deallocate security structure @sma->security for the semaphore. + */ +void security_sem_free(struct kern_ipc_perm *sma) +{ + call_void_hook(sem_free_security, sma); + kfree(sma->security); + sma->security = NULL; +} + +/** + * security_sem_associate() - Check if a sysv semaphore operation is allowed + * @sma: sysv ipc permission structure + * @semflg: operation flags + * + * Check permission when a semaphore is requested through the semget system + * call. This hook is only called when returning the semaphore identifier for + * an existing semaphore, not when a new one must be created. + * + * Return: Returns 0 if permission is granted. + */ +int security_sem_associate(struct kern_ipc_perm *sma, int semflg) +{ + return call_int_hook(sem_associate, 0, sma, semflg); +} + +/** + * security_sem_semctl() - Check if a sysv semaphore operation is allowed + * @sma: sysv ipc permission structure + * @cmd: operation + * + * Check permission when a semaphore operation specified by @cmd is to be + * performed on the semaphore. + * + * Return: Returns 0 if permission is granted. + */ +int security_sem_semctl(struct kern_ipc_perm *sma, int cmd) +{ + return call_int_hook(sem_semctl, 0, sma, cmd); +} + +/** + * security_sem_semop() - Check if a sysv semaphore operation is allowed + * @sma: sysv ipc permission structure + * @sops: operations to perform + * @nsops: number of operations + * @alter: flag indicating changes will be made + * + * Check permissions before performing operations on members of the semaphore + * set. If the @alter flag is nonzero, the semaphore set may be modified. + * + * Return: Returns 0 if permission is granted. + */ +int security_sem_semop(struct kern_ipc_perm *sma, struct sembuf *sops, + unsigned nsops, int alter) +{ + return call_int_hook(sem_semop, 0, sma, sops, nsops, alter); +} + +/** + * security_d_instantiate() - Populate an inode's LSM state based on a dentry + * @dentry: dentry + * @inode: inode + * + * Fill in @inode security information for a @dentry if allowed. + */ +void security_d_instantiate(struct dentry *dentry, struct inode *inode) +{ + if (unlikely(inode && IS_PRIVATE(inode))) + return; + call_void_hook(d_instantiate, dentry, inode); +} +EXPORT_SYMBOL(security_d_instantiate); + +/** + * security_getprocattr() - Read an attribute for a task + * @p: the task + * @lsm: LSM name + * @name: attribute name + * @value: attribute value + * + * Read attribute @name for task @p and store it into @value if allowed. + * + * Return: Returns the length of @value on success, a negative value otherwise. + */ +int security_getprocattr(struct task_struct *p, const char *lsm, + const char *name, char **value) +{ + struct security_hook_list *hp; + + hlist_for_each_entry(hp, &security_hook_heads.getprocattr, list) { + if (lsm != NULL && strcmp(lsm, hp->lsm)) + continue; + return hp->hook.getprocattr(p, name, value); + } + return LSM_RET_DEFAULT(getprocattr); +} + +/** + * security_setprocattr() - Set an attribute for a task + * @lsm: LSM name + * @name: attribute name + * @value: attribute value + * @size: attribute value size + * + * Write (set) the current task's attribute @name to @value, size @size if + * allowed. + * + * Return: Returns bytes written on success, a negative value otherwise. + */ +int security_setprocattr(const char *lsm, const char *name, void *value, + size_t size) +{ + struct security_hook_list *hp; + + hlist_for_each_entry(hp, &security_hook_heads.setprocattr, list) { + if (lsm != NULL && strcmp(lsm, hp->lsm)) + continue; + return hp->hook.setprocattr(name, value, size); + } + return LSM_RET_DEFAULT(setprocattr); +} + +/** + * security_netlink_send() - Save info and check if netlink sending is allowed + * @sk: sending socket + * @skb: netlink message + * + * Save security information for a netlink message so that permission checking + * can be performed when the message is processed. The security information + * can be saved using the eff_cap field of the netlink_skb_parms structure. + * Also may be used to provide fine grained control over message transmission. + * + * Return: Returns 0 if the information was successfully saved and message is + * allowed to be transmitted. + */ +int security_netlink_send(struct sock *sk, struct sk_buff *skb) +{ + return call_int_hook(netlink_send, 0, sk, skb); +} + +/** + * security_ismaclabel() - Check is the named attribute is a MAC label + * @name: full extended attribute name + * + * Check if the extended attribute specified by @name represents a MAC label. + * + * Return: Returns 1 if name is a MAC attribute otherwise returns 0. + */ +int security_ismaclabel(const char *name) +{ + return call_int_hook(ismaclabel, 0, name); +} +EXPORT_SYMBOL(security_ismaclabel); + +/** + * security_secid_to_secctx() - Convert a secid to a secctx + * @secid: secid + * @secdata: secctx + * @seclen: secctx length + * + * Convert secid to security context. If @secdata is NULL the length of the + * result will be returned in @seclen, but no @secdata will be returned. This + * does mean that the length could change between calls to check the length and + * the next call which actually allocates and returns the @secdata. + * + * Return: Return 0 on success, error on failure. + */ +int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) +{ + struct security_hook_list *hp; + int rc; + + /* + * Currently, only one LSM can implement secid_to_secctx (i.e this + * LSM hook is not "stackable"). + */ + hlist_for_each_entry(hp, &security_hook_heads.secid_to_secctx, list) { + rc = hp->hook.secid_to_secctx(secid, secdata, seclen); + if (rc != LSM_RET_DEFAULT(secid_to_secctx)) + return rc; + } + + return LSM_RET_DEFAULT(secid_to_secctx); +} +EXPORT_SYMBOL(security_secid_to_secctx); + +/** + * security_secctx_to_secid() - Convert a secctx to a secid + * @secdata: secctx + * @seclen: length of secctx + * @secid: secid + * + * Convert security context to secid. + * + * Return: Returns 0 on success, error on failure. + */ +int security_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) +{ + *secid = 0; + return call_int_hook(secctx_to_secid, 0, secdata, seclen, secid); +} +EXPORT_SYMBOL(security_secctx_to_secid); + +/** + * security_release_secctx() - Free a secctx buffer + * @secdata: secctx + * @seclen: length of secctx + * + * Release the security context. + */ +void security_release_secctx(char *secdata, u32 seclen) +{ + call_void_hook(release_secctx, secdata, seclen); +} +EXPORT_SYMBOL(security_release_secctx); + +/** + * security_inode_invalidate_secctx() - Invalidate an inode's security label + * @inode: inode + * + * Notify the security module that it must revalidate the security context of + * an inode. + */ +void security_inode_invalidate_secctx(struct inode *inode) +{ + call_void_hook(inode_invalidate_secctx, inode); +} +EXPORT_SYMBOL(security_inode_invalidate_secctx); + +/** + * security_inode_notifysecctx() - Nofify the LSM of an inode's security label + * @inode: inode + * @ctx: secctx + * @ctxlen: length of secctx + * + * Notify the security module of what the security context of an inode should + * be. Initializes the incore security context managed by the security module + * for this inode. Example usage: NFS client invokes this hook to initialize + * the security context in its incore inode to the value provided by the server + * for the file when the server returned the file's attributes to the client. + * Must be called with inode->i_mutex locked. + * + * Return: Returns 0 on success, error on failure. + */ +int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) +{ + return call_int_hook(inode_notifysecctx, 0, inode, ctx, ctxlen); +} +EXPORT_SYMBOL(security_inode_notifysecctx); + +/** + * security_inode_setsecctx() - Change the security label of an inode + * @dentry: inode + * @ctx: secctx + * @ctxlen: length of secctx + * + * Change the security context of an inode. Updates the incore security + * context managed by the security module and invokes the fs code as needed + * (via __vfs_setxattr_noperm) to update any backing xattrs that represent the + * context. Example usage: NFS server invokes this hook to change the security + * context in its incore inode and on the backing filesystem to a value + * provided by the client on a SETATTR operation. Must be called with + * inode->i_mutex locked. + * + * Return: Returns 0 on success, error on failure. + */ +int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) +{ + return call_int_hook(inode_setsecctx, 0, dentry, ctx, ctxlen); +} +EXPORT_SYMBOL(security_inode_setsecctx); + +/** + * security_inode_getsecctx() - Get the security label of an inode + * @inode: inode + * @ctx: secctx + * @ctxlen: length of secctx + * + * On success, returns 0 and fills out @ctx and @ctxlen with the security + * context for the given @inode. + * + * Return: Returns 0 on success, error on failure. + */ +int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) +{ + return call_int_hook(inode_getsecctx, -EOPNOTSUPP, inode, ctx, ctxlen); +} +EXPORT_SYMBOL(security_inode_getsecctx); + +#ifdef CONFIG_WATCH_QUEUE +/** + * security_post_notification() - Check if a watch notification can be posted + * @w_cred: credentials of the task that set the watch + * @cred: credentials of the task which triggered the watch + * @n: the notification + * + * Check to see if a watch notification can be posted to a particular queue. + * + * Return: Returns 0 if permission is granted. + */ +int security_post_notification(const struct cred *w_cred, + const struct cred *cred, + struct watch_notification *n) +{ + return call_int_hook(post_notification, 0, w_cred, cred, n); +} +#endif /* CONFIG_WATCH_QUEUE */ + +#ifdef CONFIG_KEY_NOTIFICATIONS +/** + * security_watch_key() - Check if a task is allowed to watch for key events + * @key: the key to watch + * + * Check to see if a process is allowed to watch for event notifications from + * a key or keyring. + * + * Return: Returns 0 if permission is granted. + */ +int security_watch_key(struct key *key) +{ + return call_int_hook(watch_key, 0, key); +} +#endif /* CONFIG_KEY_NOTIFICATIONS */ + +#ifdef CONFIG_SECURITY_NETWORK +/** + * security_unix_stream_connect() - Check if a AF_UNIX stream is allowed + * @sock: originating sock + * @other: peer sock + * @newsk: new sock + * + * Check permissions before establishing a Unix domain stream connection + * between @sock and @other. + * + * The @unix_stream_connect and @unix_may_send hooks were necessary because + * Linux provides an alternative to the conventional file name space for Unix + * domain sockets. Whereas binding and connecting to sockets in the file name + * space is mediated by the typical file permissions (and caught by the mknod + * and permission hooks in inode_security_ops), binding and connecting to + * sockets in the abstract name space is completely unmediated. Sufficient + * control of Unix domain sockets in the abstract name space isn't possible + * using only the socket layer hooks, since we need to know the actual target + * socket, which is not looked up until we are inside the af_unix code. + * + * Return: Returns 0 if permission is granted. + */ +int security_unix_stream_connect(struct sock *sock, struct sock *other, + struct sock *newsk) +{ + return call_int_hook(unix_stream_connect, 0, sock, other, newsk); +} +EXPORT_SYMBOL(security_unix_stream_connect); + +/** + * security_unix_may_send() - Check if AF_UNIX socket can send datagrams + * @sock: originating sock + * @other: peer sock + * + * Check permissions before connecting or sending datagrams from @sock to + * @other. + * + * The @unix_stream_connect and @unix_may_send hooks were necessary because + * Linux provides an alternative to the conventional file name space for Unix + * domain sockets. Whereas binding and connecting to sockets in the file name + * space is mediated by the typical file permissions (and caught by the mknod + * and permission hooks in inode_security_ops), binding and connecting to + * sockets in the abstract name space is completely unmediated. Sufficient + * control of Unix domain sockets in the abstract name space isn't possible + * using only the socket layer hooks, since we need to know the actual target + * socket, which is not looked up until we are inside the af_unix code. + * + * Return: Returns 0 if permission is granted. + */ +int security_unix_may_send(struct socket *sock, struct socket *other) +{ + return call_int_hook(unix_may_send, 0, sock, other); +} +EXPORT_SYMBOL(security_unix_may_send); + +/** + * security_socket_create() - Check if creating a new socket is allowed + * @family: protocol family + * @type: communications type + * @protocol: requested protocol + * @kern: set to 1 if a kernel socket is requested + * + * Check permissions prior to creating a new socket. + * + * Return: Returns 0 if permission is granted. + */ +int security_socket_create(int family, int type, int protocol, int kern) +{ + return call_int_hook(socket_create, 0, family, type, protocol, kern); +} + +/** + * security_socket_post_create() - Initialize a newly created socket + * @sock: socket + * @family: protocol family + * @type: communications type + * @protocol: requested protocol + * @kern: set to 1 if a kernel socket is requested + * + * This hook allows a module to update or allocate a per-socket security + * structure. Note that the security field was not added directly to the socket + * structure, but rather, the socket security information is stored in the + * associated inode. Typically, the inode alloc_security hook will allocate + * and attach security information to SOCK_INODE(sock)->i_security. This hook + * may be used to update the SOCK_INODE(sock)->i_security field with additional + * information that wasn't available when the inode was allocated. + * + * Return: Returns 0 if permission is granted. + */ +int security_socket_post_create(struct socket *sock, int family, + int type, int protocol, int kern) +{ + return call_int_hook(socket_post_create, 0, sock, family, type, + protocol, kern); +} + +/** + * security_socket_socketpair() - Check if creating a socketpair is allowed + * @socka: first socket + * @sockb: second socket + * + * Check permissions before creating a fresh pair of sockets. + * + * Return: Returns 0 if permission is granted and the connection was + * established. + */ +int security_socket_socketpair(struct socket *socka, struct socket *sockb) +{ + return call_int_hook(socket_socketpair, 0, socka, sockb); +} +EXPORT_SYMBOL(security_socket_socketpair); + +/** + * security_socket_bind() - Check if a socket bind operation is allowed + * @sock: socket + * @address: requested bind address + * @addrlen: length of address + * + * Check permission before socket protocol layer bind operation is performed + * and the socket @sock is bound to the address specified in the @address + * parameter. + * + * Return: Returns 0 if permission is granted. + */ +int security_socket_bind(struct socket *sock, + struct sockaddr *address, int addrlen) +{ + return call_int_hook(socket_bind, 0, sock, address, addrlen); +} + +/** + * security_socket_connect() - Check if a socket connect operation is allowed + * @sock: socket + * @address: address of remote connection point + * @addrlen: length of address + * + * Check permission before socket protocol layer connect operation attempts to + * connect socket @sock to a remote address, @address. + * + * Return: Returns 0 if permission is granted. + */ +int security_socket_connect(struct socket *sock, + struct sockaddr *address, int addrlen) +{ + return call_int_hook(socket_connect, 0, sock, address, addrlen); +} + +/** + * security_socket_listen() - Check if a socket is allowed to listen + * @sock: socket + * @backlog: connection queue size + * + * Check permission before socket protocol layer listen operation. + * + * Return: Returns 0 if permission is granted. + */ +int security_socket_listen(struct socket *sock, int backlog) +{ + return call_int_hook(socket_listen, 0, sock, backlog); +} + +/** + * security_socket_accept() - Check if a socket is allowed to accept connections + * @sock: listening socket + * @newsock: newly creation connection socket + * + * Check permission before accepting a new connection. Note that the new + * socket, @newsock, has been created and some information copied to it, but + * the accept operation has not actually been performed. + * + * Return: Returns 0 if permission is granted. + */ +int security_socket_accept(struct socket *sock, struct socket *newsock) +{ + return call_int_hook(socket_accept, 0, sock, newsock); +} + +/** + * security_socket_sendmsg() - Check is sending a message is allowed + * @sock: sending socket + * @msg: message to send + * @size: size of message + * + * Check permission before transmitting a message to another socket. + * + * Return: Returns 0 if permission is granted. + */ +int security_socket_sendmsg(struct socket *sock, struct msghdr *msg, int size) +{ + return call_int_hook(socket_sendmsg, 0, sock, msg, size); +} + +/** + * security_socket_recvmsg() - Check if receiving a message is allowed + * @sock: receiving socket + * @msg: message to receive + * @size: size of message + * @flags: operational flags + * + * Check permission before receiving a message from a socket. + * + * Return: Returns 0 if permission is granted. + */ +int security_socket_recvmsg(struct socket *sock, struct msghdr *msg, + int size, int flags) +{ + return call_int_hook(socket_recvmsg, 0, sock, msg, size, flags); +} + +/** + * security_socket_getsockname() - Check if reading the socket addr is allowed + * @sock: socket + * + * Check permission before reading the local address (name) of the socket + * object. + * + * Return: Returns 0 if permission is granted. + */ +int security_socket_getsockname(struct socket *sock) +{ + return call_int_hook(socket_getsockname, 0, sock); +} + +/** + * security_socket_getpeername() - Check if reading the peer's addr is allowed + * @sock: socket + * + * Check permission before the remote address (name) of a socket object. + * + * Return: Returns 0 if permission is granted. + */ +int security_socket_getpeername(struct socket *sock) +{ + return call_int_hook(socket_getpeername, 0, sock); +} + +/** + * security_socket_getsockopt() - Check if reading a socket option is allowed + * @sock: socket + * @level: option's protocol level + * @optname: option name + * + * Check permissions before retrieving the options associated with socket + * @sock. + * + * Return: Returns 0 if permission is granted. + */ +int security_socket_getsockopt(struct socket *sock, int level, int optname) +{ + return call_int_hook(socket_getsockopt, 0, sock, level, optname); +} + +/** + * security_socket_setsockopt() - Check if setting a socket option is allowed + * @sock: socket + * @level: option's protocol level + * @optname: option name + * + * Check permissions before setting the options associated with socket @sock. + * + * Return: Returns 0 if permission is granted. + */ +int security_socket_setsockopt(struct socket *sock, int level, int optname) +{ + return call_int_hook(socket_setsockopt, 0, sock, level, optname); +} + +/** + * security_socket_shutdown() - Checks if shutting down the socket is allowed + * @sock: socket + * @how: flag indicating how sends and receives are handled + * + * Checks permission before all or part of a connection on the socket @sock is + * shut down. + * + * Return: Returns 0 if permission is granted. + */ +int security_socket_shutdown(struct socket *sock, int how) +{ + return call_int_hook(socket_shutdown, 0, sock, how); +} + +/** + * security_sock_rcv_skb() - Check if an incoming network packet is allowed + * @sk: destination sock + * @skb: incoming packet + * + * Check permissions on incoming network packets. This hook is distinct from + * Netfilter's IP input hooks since it is the first time that the incoming + * sk_buff @skb has been associated with a particular socket, @sk. Must not + * sleep inside this hook because some callers hold spinlocks. + * + * Return: Returns 0 if permission is granted. + */ +int security_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) +{ + return call_int_hook(socket_sock_rcv_skb, 0, sk, skb); +} +EXPORT_SYMBOL(security_sock_rcv_skb); + +/** + * security_socket_getpeersec_stream() - Get the remote peer label + * @sock: socket + * @optval: destination buffer + * @optlen: size of peer label copied into the buffer + * @len: maximum size of the destination buffer + * + * This hook allows the security module to provide peer socket security state + * for unix or connected tcp sockets to userspace via getsockopt SO_GETPEERSEC. + * For tcp sockets this can be meaningful if the socket is associated with an + * ipsec SA. + * + * Return: Returns 0 if all is well, otherwise, typical getsockopt return + * values. + */ +int security_socket_getpeersec_stream(struct socket *sock, sockptr_t optval, + sockptr_t optlen, unsigned int len) +{ + return call_int_hook(socket_getpeersec_stream, -ENOPROTOOPT, sock, + optval, optlen, len); +} + +/** + * security_socket_getpeersec_dgram() - Get the remote peer label + * @sock: socket + * @skb: datagram packet + * @secid: remote peer label secid + * + * This hook allows the security module to provide peer socket security state + * for udp sockets on a per-packet basis to userspace via getsockopt + * SO_GETPEERSEC. The application must first have indicated the IP_PASSSEC + * option via getsockopt. It can then retrieve the security state returned by + * this hook for a packet via the SCM_SECURITY ancillary message type. + * + * Return: Returns 0 on success, error on failure. + */ +int security_socket_getpeersec_dgram(struct socket *sock, + struct sk_buff *skb, u32 *secid) +{ + return call_int_hook(socket_getpeersec_dgram, -ENOPROTOOPT, sock, + skb, secid); +} +EXPORT_SYMBOL(security_socket_getpeersec_dgram); + +/** + * security_sk_alloc() - Allocate and initialize a sock's LSM blob + * @sk: sock + * @family: protocol family + * @priority: gfp flags + * + * Allocate and attach a security structure to the sk->sk_security field, which + * is used to copy security attributes between local stream sockets. + * + * Return: Returns 0 on success, error on failure. + */ +int security_sk_alloc(struct sock *sk, int family, gfp_t priority) +{ + return call_int_hook(sk_alloc_security, 0, sk, family, priority); +} + +/** + * security_sk_free() - Free the sock's LSM blob + * @sk: sock + * + * Deallocate security structure. + */ +void security_sk_free(struct sock *sk) +{ + call_void_hook(sk_free_security, sk); +} + +/** + * security_sk_clone() - Clone a sock's LSM state + * @sk: original sock + * @newsk: target sock + * + * Clone/copy security structure. + */ +void security_sk_clone(const struct sock *sk, struct sock *newsk) +{ + call_void_hook(sk_clone_security, sk, newsk); +} +EXPORT_SYMBOL(security_sk_clone); + +/** + * security_sk_classify_flow() - Set a flow's secid based on socket + * @sk: original socket + * @flic: target flow + * + * Set the target flow's secid to socket's secid. + */ +void security_sk_classify_flow(const struct sock *sk, struct flowi_common *flic) +{ + call_void_hook(sk_getsecid, sk, &flic->flowic_secid); +} +EXPORT_SYMBOL(security_sk_classify_flow); + +/** + * security_req_classify_flow() - Set a flow's secid based on request_sock + * @req: request_sock + * @flic: target flow + * + * Sets @flic's secid to @req's secid. + */ +void security_req_classify_flow(const struct request_sock *req, + struct flowi_common *flic) +{ + call_void_hook(req_classify_flow, req, flic); +} +EXPORT_SYMBOL(security_req_classify_flow); + +/** + * security_sock_graft() - Reconcile LSM state when grafting a sock on a socket + * @sk: sock being grafted + * @parent: target parent socket + * + * Sets @parent's inode secid to @sk's secid and update @sk with any necessary + * LSM state from @parent. + */ +void security_sock_graft(struct sock *sk, struct socket *parent) +{ + call_void_hook(sock_graft, sk, parent); +} +EXPORT_SYMBOL(security_sock_graft); + +/** + * security_inet_conn_request() - Set request_sock state using incoming connect + * @sk: parent listening sock + * @skb: incoming connection + * @req: new request_sock + * + * Initialize the @req LSM state based on @sk and the incoming connect in @skb. + * + * Return: Returns 0 if permission is granted. + */ +int security_inet_conn_request(const struct sock *sk, + struct sk_buff *skb, struct request_sock *req) +{ + return call_int_hook(inet_conn_request, 0, sk, skb, req); +} +EXPORT_SYMBOL(security_inet_conn_request); + +/** + * security_inet_csk_clone() - Set new sock LSM state based on request_sock + * @newsk: new sock + * @req: connection request_sock + * + * Set that LSM state of @sock using the LSM state from @req. + */ +void security_inet_csk_clone(struct sock *newsk, + const struct request_sock *req) +{ + call_void_hook(inet_csk_clone, newsk, req); +} + +/** + * security_inet_conn_established() - Update sock's LSM state with connection + * @sk: sock + * @skb: connection packet + * + * Update @sock's LSM state to represent a new connection from @skb. + */ +void security_inet_conn_established(struct sock *sk, + struct sk_buff *skb) +{ + call_void_hook(inet_conn_established, sk, skb); +} +EXPORT_SYMBOL(security_inet_conn_established); + +/** + * security_secmark_relabel_packet() - Check if setting a secmark is allowed + * @secid: new secmark value + * + * Check if the process should be allowed to relabel packets to @secid. + * + * Return: Returns 0 if permission is granted. + */ +int security_secmark_relabel_packet(u32 secid) +{ + return call_int_hook(secmark_relabel_packet, 0, secid); +} +EXPORT_SYMBOL(security_secmark_relabel_packet); + +/** + * security_secmark_refcount_inc() - Increment the secmark labeling rule count + * + * Tells the LSM to increment the number of secmark labeling rules loaded. + */ +void security_secmark_refcount_inc(void) +{ + call_void_hook(secmark_refcount_inc); +} +EXPORT_SYMBOL(security_secmark_refcount_inc); + +/** + * security_secmark_refcount_dec() - Decrement the secmark labeling rule count + * + * Tells the LSM to decrement the number of secmark labeling rules loaded. + */ +void security_secmark_refcount_dec(void) +{ + call_void_hook(secmark_refcount_dec); +} +EXPORT_SYMBOL(security_secmark_refcount_dec); + +/** + * security_tun_dev_alloc_security() - Allocate a LSM blob for a TUN device + * @security: pointer to the LSM blob + * + * This hook allows a module to allocate a security structure for a TUN device, + * returning the pointer in @security. + * + * Return: Returns a zero on success, negative values on failure. + */ +int security_tun_dev_alloc_security(void **security) +{ + return call_int_hook(tun_dev_alloc_security, 0, security); +} +EXPORT_SYMBOL(security_tun_dev_alloc_security); + +/** + * security_tun_dev_free_security() - Free a TUN device LSM blob + * @security: LSM blob + * + * This hook allows a module to free the security structure for a TUN device. + */ +void security_tun_dev_free_security(void *security) +{ + call_void_hook(tun_dev_free_security, security); +} +EXPORT_SYMBOL(security_tun_dev_free_security); + +/** + * security_tun_dev_create() - Check if creating a TUN device is allowed + * + * Check permissions prior to creating a new TUN device. + * + * Return: Returns 0 if permission is granted. + */ +int security_tun_dev_create(void) +{ + return call_int_hook(tun_dev_create, 0); +} +EXPORT_SYMBOL(security_tun_dev_create); + +/** + * security_tun_dev_attach_queue() - Check if attaching a TUN queue is allowed + * @security: TUN device LSM blob + * + * Check permissions prior to attaching to a TUN device queue. + * + * Return: Returns 0 if permission is granted. + */ +int security_tun_dev_attach_queue(void *security) +{ + return call_int_hook(tun_dev_attach_queue, 0, security); +} +EXPORT_SYMBOL(security_tun_dev_attach_queue); + +/** + * security_tun_dev_attach() - Update TUN device LSM state on attach + * @sk: associated sock + * @security: TUN device LSM blob + * + * This hook can be used by the module to update any security state associated + * with the TUN device's sock structure. + * + * Return: Returns 0 if permission is granted. + */ +int security_tun_dev_attach(struct sock *sk, void *security) +{ + return call_int_hook(tun_dev_attach, 0, sk, security); +} +EXPORT_SYMBOL(security_tun_dev_attach); + +/** + * security_tun_dev_open() - Update TUN device LSM state on open + * @security: TUN device LSM blob + * + * This hook can be used by the module to update any security state associated + * with the TUN device's security structure. + * + * Return: Returns 0 if permission is granted. + */ +int security_tun_dev_open(void *security) +{ + return call_int_hook(tun_dev_open, 0, security); +} +EXPORT_SYMBOL(security_tun_dev_open); + +/** + * security_sctp_assoc_request() - Update the LSM on a SCTP association req + * @asoc: SCTP association + * @skb: packet requesting the association + * + * Passes the @asoc and @chunk->skb of the association INIT packet to the LSM. + * + * Return: Returns 0 on success, error on failure. + */ +int security_sctp_assoc_request(struct sctp_association *asoc, + struct sk_buff *skb) +{ + return call_int_hook(sctp_assoc_request, 0, asoc, skb); +} +EXPORT_SYMBOL(security_sctp_assoc_request); + +/** + * security_sctp_bind_connect() - Validate a list of addrs for a SCTP option + * @sk: socket + * @optname: SCTP option to validate + * @address: list of IP addresses to validate + * @addrlen: length of the address list + * + * Validiate permissions required for each address associated with sock @sk. + * Depending on @optname, the addresses will be treated as either a connect or + * bind service. The @addrlen is calculated on each IPv4 and IPv6 address using + * sizeof(struct sockaddr_in) or sizeof(struct sockaddr_in6). + * + * Return: Returns 0 on success, error on failure. + */ +int security_sctp_bind_connect(struct sock *sk, int optname, + struct sockaddr *address, int addrlen) +{ + return call_int_hook(sctp_bind_connect, 0, sk, optname, + address, addrlen); +} +EXPORT_SYMBOL(security_sctp_bind_connect); + +/** + * security_sctp_sk_clone() - Clone a SCTP sock's LSM state + * @asoc: SCTP association + * @sk: original sock + * @newsk: target sock + * + * Called whenever a new socket is created by accept(2) (i.e. a TCP style + * socket) or when a socket is 'peeled off' e.g userspace calls + * sctp_peeloff(3). + */ +void security_sctp_sk_clone(struct sctp_association *asoc, struct sock *sk, + struct sock *newsk) +{ + call_void_hook(sctp_sk_clone, asoc, sk, newsk); +} +EXPORT_SYMBOL(security_sctp_sk_clone); + +/** + * security_sctp_assoc_established() - Update LSM state when assoc established + * @asoc: SCTP association + * @skb: packet establishing the association + * + * Passes the @asoc and @chunk->skb of the association COOKIE_ACK packet to the + * security module. + * + * Return: Returns 0 if permission is granted. + */ +int security_sctp_assoc_established(struct sctp_association *asoc, + struct sk_buff *skb) +{ + return call_int_hook(sctp_assoc_established, 0, asoc, skb); +} +EXPORT_SYMBOL(security_sctp_assoc_established); + +/** + * security_mptcp_add_subflow() - Inherit the LSM label from the MPTCP socket + * @sk: the owning MPTCP socket + * @ssk: the new subflow + * + * Update the labeling for the given MPTCP subflow, to match the one of the + * owning MPTCP socket. This hook has to be called after the socket creation and + * initialization via the security_socket_create() and + * security_socket_post_create() LSM hooks. + * + * Return: Returns 0 on success or a negative error code on failure. + */ +int security_mptcp_add_subflow(struct sock *sk, struct sock *ssk) +{ + return call_int_hook(mptcp_add_subflow, 0, sk, ssk); +} + +#endif /* CONFIG_SECURITY_NETWORK */ + +#ifdef CONFIG_SECURITY_INFINIBAND +/** + * security_ib_pkey_access() - Check if access to an IB pkey is allowed + * @sec: LSM blob + * @subnet_prefix: subnet prefix of the port + * @pkey: IB pkey + * + * Check permission to access a pkey when modifying a QP. + * + * Return: Returns 0 if permission is granted. + */ +int security_ib_pkey_access(void *sec, u64 subnet_prefix, u16 pkey) +{ + return call_int_hook(ib_pkey_access, 0, sec, subnet_prefix, pkey); +} +EXPORT_SYMBOL(security_ib_pkey_access); + +/** + * security_ib_endport_manage_subnet() - Check if SMPs traffic is allowed + * @sec: LSM blob + * @dev_name: IB device name + * @port_num: port number + * + * Check permissions to send and receive SMPs on a end port. + * + * Return: Returns 0 if permission is granted. + */ +int security_ib_endport_manage_subnet(void *sec, + const char *dev_name, u8 port_num) +{ + return call_int_hook(ib_endport_manage_subnet, 0, sec, + dev_name, port_num); +} +EXPORT_SYMBOL(security_ib_endport_manage_subnet); + +/** + * security_ib_alloc_security() - Allocate an Infiniband LSM blob + * @sec: LSM blob + * + * Allocate a security structure for Infiniband objects. + * + * Return: Returns 0 on success, non-zero on failure. + */ +int security_ib_alloc_security(void **sec) +{ + return call_int_hook(ib_alloc_security, 0, sec); +} +EXPORT_SYMBOL(security_ib_alloc_security); + +/** + * security_ib_free_security() - Free an Infiniband LSM blob + * @sec: LSM blob + * + * Deallocate an Infiniband security structure. + */ +void security_ib_free_security(void *sec) +{ + call_void_hook(ib_free_security, sec); +} +EXPORT_SYMBOL(security_ib_free_security); +#endif /* CONFIG_SECURITY_INFINIBAND */ + +#ifdef CONFIG_SECURITY_NETWORK_XFRM +/** + * security_xfrm_policy_alloc() - Allocate a xfrm policy LSM blob + * @ctxp: xfrm security context being added to the SPD + * @sec_ctx: security label provided by userspace + * @gfp: gfp flags + * + * Allocate a security structure to the xp->security field; the security field + * is initialized to NULL when the xfrm_policy is allocated. + * + * Return: Return 0 if operation was successful. + */ +int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp, + struct xfrm_user_sec_ctx *sec_ctx, + gfp_t gfp) +{ + return call_int_hook(xfrm_policy_alloc_security, 0, ctxp, sec_ctx, gfp); +} +EXPORT_SYMBOL(security_xfrm_policy_alloc); + +/** + * security_xfrm_policy_clone() - Clone xfrm policy LSM state + * @old_ctx: xfrm security context + * @new_ctxp: target xfrm security context + * + * Allocate a security structure in new_ctxp that contains the information from + * the old_ctx structure. + * + * Return: Return 0 if operation was successful. + */ +int security_xfrm_policy_clone(struct xfrm_sec_ctx *old_ctx, + struct xfrm_sec_ctx **new_ctxp) +{ + return call_int_hook(xfrm_policy_clone_security, 0, old_ctx, new_ctxp); +} + +/** + * security_xfrm_policy_free() - Free a xfrm security context + * @ctx: xfrm security context + * + * Free LSM resources associated with @ctx. + */ +void security_xfrm_policy_free(struct xfrm_sec_ctx *ctx) +{ + call_void_hook(xfrm_policy_free_security, ctx); +} +EXPORT_SYMBOL(security_xfrm_policy_free); + +/** + * security_xfrm_policy_delete() - Check if deleting a xfrm policy is allowed + * @ctx: xfrm security context + * + * Authorize deletion of a SPD entry. + * + * Return: Returns 0 if permission is granted. + */ +int security_xfrm_policy_delete(struct xfrm_sec_ctx *ctx) +{ + return call_int_hook(xfrm_policy_delete_security, 0, ctx); +} + +/** + * security_xfrm_state_alloc() - Allocate a xfrm state LSM blob + * @x: xfrm state being added to the SAD + * @sec_ctx: security label provided by userspace + * + * Allocate a security structure to the @x->security field; the security field + * is initialized to NULL when the xfrm_state is allocated. Set the context to + * correspond to @sec_ctx. + * + * Return: Return 0 if operation was successful. + */ +int security_xfrm_state_alloc(struct xfrm_state *x, + struct xfrm_user_sec_ctx *sec_ctx) +{ + return call_int_hook(xfrm_state_alloc, 0, x, sec_ctx); +} +EXPORT_SYMBOL(security_xfrm_state_alloc); + +/** + * security_xfrm_state_alloc_acquire() - Allocate a xfrm state LSM blob + * @x: xfrm state being added to the SAD + * @polsec: associated policy's security context + * @secid: secid from the flow + * + * Allocate a security structure to the x->security field; the security field + * is initialized to NULL when the xfrm_state is allocated. Set the context to + * correspond to secid. + * + * Return: Returns 0 if operation was successful. + */ +int security_xfrm_state_alloc_acquire(struct xfrm_state *x, + struct xfrm_sec_ctx *polsec, u32 secid) +{ + return call_int_hook(xfrm_state_alloc_acquire, 0, x, polsec, secid); +} + +/** + * security_xfrm_state_delete() - Check if deleting a xfrm state is allowed + * @x: xfrm state + * + * Authorize deletion of x->security. + * + * Return: Returns 0 if permission is granted. + */ +int security_xfrm_state_delete(struct xfrm_state *x) +{ + return call_int_hook(xfrm_state_delete_security, 0, x); +} +EXPORT_SYMBOL(security_xfrm_state_delete); + +/** + * security_xfrm_state_free() - Free a xfrm state + * @x: xfrm state + * + * Deallocate x->security. + */ +void security_xfrm_state_free(struct xfrm_state *x) +{ + call_void_hook(xfrm_state_free_security, x); +} + +/** + * security_xfrm_policy_lookup() - Check if using a xfrm policy is allowed + * @ctx: target xfrm security context + * @fl_secid: flow secid used to authorize access + * + * Check permission when a flow selects a xfrm_policy for processing XFRMs on a + * packet. The hook is called when selecting either a per-socket policy or a + * generic xfrm policy. + * + * Return: Return 0 if permission is granted, -ESRCH otherwise, or -errno on + * other errors. + */ +int security_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 fl_secid) +{ + return call_int_hook(xfrm_policy_lookup, 0, ctx, fl_secid); +} + +/** + * security_xfrm_state_pol_flow_match() - Check for a xfrm match + * @x: xfrm state to match + * @xp: xfrm policy to check for a match + * @flic: flow to check for a match. + * + * Check @xp and @flic for a match with @x. + * + * Return: Returns 1 if there is a match. + */ +int security_xfrm_state_pol_flow_match(struct xfrm_state *x, + struct xfrm_policy *xp, + const struct flowi_common *flic) +{ + struct security_hook_list *hp; + int rc = LSM_RET_DEFAULT(xfrm_state_pol_flow_match); + + /* + * Since this function is expected to return 0 or 1, the judgment + * becomes difficult if multiple LSMs supply this call. Fortunately, + * we can use the first LSM's judgment because currently only SELinux + * supplies this call. + * + * For speed optimization, we explicitly break the loop rather than + * using the macro + */ + hlist_for_each_entry(hp, &security_hook_heads.xfrm_state_pol_flow_match, + list) { + rc = hp->hook.xfrm_state_pol_flow_match(x, xp, flic); + break; + } + return rc; +} + +/** + * security_xfrm_decode_session() - Determine the xfrm secid for a packet + * @skb: xfrm packet + * @secid: secid + * + * Decode the packet in @skb and return the security label in @secid. + * + * Return: Return 0 if all xfrms used have the same secid. + */ +int security_xfrm_decode_session(struct sk_buff *skb, u32 *secid) +{ + return call_int_hook(xfrm_decode_session, 0, skb, secid, 1); +} + +void security_skb_classify_flow(struct sk_buff *skb, struct flowi_common *flic) +{ + int rc = call_int_hook(xfrm_decode_session, 0, skb, &flic->flowic_secid, + 0); + + BUG_ON(rc); +} +EXPORT_SYMBOL(security_skb_classify_flow); +#endif /* CONFIG_SECURITY_NETWORK_XFRM */ + +#ifdef CONFIG_KEYS +/** + * security_key_alloc() - Allocate and initialize a kernel key LSM blob + * @key: key + * @cred: credentials + * @flags: allocation flags + * + * Permit allocation of a key and assign security data. Note that key does not + * have a serial number assigned at this point. + * + * Return: Return 0 if permission is granted, -ve error otherwise. + */ +int security_key_alloc(struct key *key, const struct cred *cred, + unsigned long flags) +{ + return call_int_hook(key_alloc, 0, key, cred, flags); +} + +/** + * security_key_free() - Free a kernel key LSM blob + * @key: key + * + * Notification of destruction; free security data. + */ +void security_key_free(struct key *key) +{ + call_void_hook(key_free, key); +} + +/** + * security_key_permission() - Check if a kernel key operation is allowed + * @key_ref: key reference + * @cred: credentials of actor requesting access + * @need_perm: requested permissions + * + * See whether a specific operational right is granted to a process on a key. + * + * Return: Return 0 if permission is granted, -ve error otherwise. + */ +int security_key_permission(key_ref_t key_ref, const struct cred *cred, + enum key_need_perm need_perm) +{ + return call_int_hook(key_permission, 0, key_ref, cred, need_perm); +} + +/** + * security_key_getsecurity() - Get the key's security label + * @key: key + * @buffer: security label buffer + * + * Get a textual representation of the security context attached to a key for + * the purposes of honouring KEYCTL_GETSECURITY. This function allocates the + * storage for the NUL-terminated string and the caller should free it. + * + * Return: Returns the length of @buffer (including terminating NUL) or -ve if + * an error occurs. May also return 0 (and a NULL buffer pointer) if + * there is no security label assigned to the key. + */ +int security_key_getsecurity(struct key *key, char **buffer) +{ + *buffer = NULL; + return call_int_hook(key_getsecurity, 0, key, buffer); +} +#endif /* CONFIG_KEYS */ + +#ifdef CONFIG_AUDIT +/** + * security_audit_rule_init() - Allocate and init an LSM audit rule struct + * @field: audit action + * @op: rule operator + * @rulestr: rule context + * @lsmrule: receive buffer for audit rule struct + * + * Allocate and initialize an LSM audit rule structure. + * + * Return: Return 0 if @lsmrule has been successfully set, -EINVAL in case of + * an invalid rule. + */ +int security_audit_rule_init(u32 field, u32 op, char *rulestr, void **lsmrule) +{ + return call_int_hook(audit_rule_init, 0, field, op, rulestr, lsmrule); +} + +/** + * security_audit_rule_known() - Check if an audit rule contains LSM fields + * @krule: audit rule + * + * Specifies whether given @krule contains any fields related to the current + * LSM. + * + * Return: Returns 1 in case of relation found, 0 otherwise. + */ +int security_audit_rule_known(struct audit_krule *krule) +{ + return call_int_hook(audit_rule_known, 0, krule); +} + +/** + * security_audit_rule_free() - Free an LSM audit rule struct + * @lsmrule: audit rule struct + * + * Deallocate the LSM audit rule structure previously allocated by + * audit_rule_init(). + */ +void security_audit_rule_free(void *lsmrule) +{ + call_void_hook(audit_rule_free, lsmrule); +} + +/** + * security_audit_rule_match() - Check if a label matches an audit rule + * @secid: security label + * @field: LSM audit field + * @op: matching operator + * @lsmrule: audit rule + * + * Determine if given @secid matches a rule previously approved by + * security_audit_rule_known(). + * + * Return: Returns 1 if secid matches the rule, 0 if it does not, -ERRNO on + * failure. + */ +int security_audit_rule_match(u32 secid, u32 field, u32 op, void *lsmrule) +{ + return call_int_hook(audit_rule_match, 0, secid, field, op, lsmrule); +} +#endif /* CONFIG_AUDIT */ + +#ifdef CONFIG_BPF_SYSCALL +/** + * security_bpf() - Check if the bpf syscall operation is allowed + * @cmd: command + * @attr: bpf attribute + * @size: size + * + * Do a initial check for all bpf syscalls after the attribute is copied into + * the kernel. The actual security module can implement their own rules to + * check the specific cmd they need. + * + * Return: Returns 0 if permission is granted. + */ +int security_bpf(int cmd, union bpf_attr *attr, unsigned int size) +{ + return call_int_hook(bpf, 0, cmd, attr, size); +} + +/** + * security_bpf_map() - Check if access to a bpf map is allowed + * @map: bpf map + * @fmode: mode + * + * Do a check when the kernel generates and returns a file descriptor for eBPF + * maps. + * + * Return: Returns 0 if permission is granted. + */ +int security_bpf_map(struct bpf_map *map, fmode_t fmode) +{ + return call_int_hook(bpf_map, 0, map, fmode); +} + +/** + * security_bpf_prog() - Check if access to a bpf program is allowed + * @prog: bpf program + * + * Do a check when the kernel generates and returns a file descriptor for eBPF + * programs. + * + * Return: Returns 0 if permission is granted. + */ +int security_bpf_prog(struct bpf_prog *prog) +{ + return call_int_hook(bpf_prog, 0, prog); +} + +/** + * security_bpf_map_alloc() - Allocate a bpf map LSM blob + * @map: bpf map + * + * Initialize the security field inside bpf map. + * + * Return: Returns 0 on success, error on failure. + */ +int security_bpf_map_alloc(struct bpf_map *map) +{ + return call_int_hook(bpf_map_alloc_security, 0, map); +} + +/** + * security_bpf_prog_alloc() - Allocate a bpf program LSM blob + * @aux: bpf program aux info struct + * + * Initialize the security field inside bpf program. + * + * Return: Returns 0 on success, error on failure. + */ +int security_bpf_prog_alloc(struct bpf_prog_aux *aux) +{ + return call_int_hook(bpf_prog_alloc_security, 0, aux); +} + +/** + * security_bpf_map_free() - Free a bpf map's LSM blob + * @map: bpf map + * + * Clean up the security information stored inside bpf map. + */ +void security_bpf_map_free(struct bpf_map *map) +{ + call_void_hook(bpf_map_free_security, map); +} + +/** + * security_bpf_prog_free() - Free a bpf program's LSM blob + * @aux: bpf program aux info struct + * + * Clean up the security information stored inside bpf prog. + */ +void security_bpf_prog_free(struct bpf_prog_aux *aux) +{ + call_void_hook(bpf_prog_free_security, aux); +} +#endif /* CONFIG_BPF_SYSCALL */ + +/** + * security_locked_down() - Check if a kernel feature is allowed + * @what: requested kernel feature + * + * Determine whether a kernel feature that potentially enables arbitrary code + * execution in kernel space should be permitted. + * + * Return: Returns 0 if permission is granted. + */ +int security_locked_down(enum lockdown_reason what) +{ + return call_int_hook(locked_down, 0, what); +} +EXPORT_SYMBOL(security_locked_down); + +#ifdef CONFIG_PERF_EVENTS +/** + * security_perf_event_open() - Check if a perf event open is allowed + * @attr: perf event attribute + * @type: type of event + * + * Check whether the @type of perf_event_open syscall is allowed. + * + * Return: Returns 0 if permission is granted. + */ +int security_perf_event_open(struct perf_event_attr *attr, int type) +{ + return call_int_hook(perf_event_open, 0, attr, type); +} + +/** + * security_perf_event_alloc() - Allocate a perf event LSM blob + * @event: perf event + * + * Allocate and save perf_event security info. + * + * Return: Returns 0 on success, error on failure. + */ +int security_perf_event_alloc(struct perf_event *event) +{ + return call_int_hook(perf_event_alloc, 0, event); +} + +/** + * security_perf_event_free() - Free a perf event LSM blob + * @event: perf event + * + * Release (free) perf_event security info. + */ +void security_perf_event_free(struct perf_event *event) +{ + call_void_hook(perf_event_free, event); +} + +/** + * security_perf_event_read() - Check if reading a perf event label is allowed + * @event: perf event + * + * Read perf_event security info if allowed. + * + * Return: Returns 0 if permission is granted. + */ +int security_perf_event_read(struct perf_event *event) +{ + return call_int_hook(perf_event_read, 0, event); +} + +/** + * security_perf_event_write() - Check if writing a perf event label is allowed + * @event: perf event + * + * Write perf_event security info if allowed. + * + * Return: Returns 0 if permission is granted. + */ +int security_perf_event_write(struct perf_event *event) +{ + return call_int_hook(perf_event_write, 0, event); +} +#endif /* CONFIG_PERF_EVENTS */ + +#ifdef CONFIG_IO_URING +/** + * security_uring_override_creds() - Check if overriding creds is allowed + * @new: new credentials + * + * Check if the current task, executing an io_uring operation, is allowed to + * override it's credentials with @new. + * + * Return: Returns 0 if permission is granted. + */ +int security_uring_override_creds(const struct cred *new) +{ + return call_int_hook(uring_override_creds, 0, new); +} + +/** + * security_uring_sqpoll() - Check if IORING_SETUP_SQPOLL is allowed + * + * Check whether the current task is allowed to spawn a io_uring polling thread + * (IORING_SETUP_SQPOLL). + * + * Return: Returns 0 if permission is granted. + */ +int security_uring_sqpoll(void) +{ + return call_int_hook(uring_sqpoll, 0); +} + +/** + * security_uring_cmd() - Check if a io_uring passthrough command is allowed + * @ioucmd: command + * + * Check whether the file_operations uring_cmd is allowed to run. + * + * Return: Returns 0 if permission is granted. + */ +int security_uring_cmd(struct io_uring_cmd *ioucmd) +{ + return call_int_hook(uring_cmd, 0, ioucmd); +} +#endif /* CONFIG_IO_URING */ |