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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /kernel/bpf/syscall.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'kernel/bpf/syscall.c')
-rw-r--r--kernel/bpf/syscall.c5735
1 files changed, 5735 insertions, 0 deletions
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
new file mode 100644
index 0000000000..f61c53237c
--- /dev/null
+++ b/kernel/bpf/syscall.c
@@ -0,0 +1,5735 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
+ */
+#include <linux/bpf.h>
+#include <linux/bpf-cgroup.h>
+#include <linux/bpf_trace.h>
+#include <linux/bpf_lirc.h>
+#include <linux/bpf_verifier.h>
+#include <linux/bsearch.h>
+#include <linux/btf.h>
+#include <linux/syscalls.h>
+#include <linux/slab.h>
+#include <linux/sched/signal.h>
+#include <linux/vmalloc.h>
+#include <linux/mmzone.h>
+#include <linux/anon_inodes.h>
+#include <linux/fdtable.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/license.h>
+#include <linux/filter.h>
+#include <linux/kernel.h>
+#include <linux/idr.h>
+#include <linux/cred.h>
+#include <linux/timekeeping.h>
+#include <linux/ctype.h>
+#include <linux/nospec.h>
+#include <linux/audit.h>
+#include <uapi/linux/btf.h>
+#include <linux/pgtable.h>
+#include <linux/bpf_lsm.h>
+#include <linux/poll.h>
+#include <linux/sort.h>
+#include <linux/bpf-netns.h>
+#include <linux/rcupdate_trace.h>
+#include <linux/memcontrol.h>
+#include <linux/trace_events.h>
+#include <net/netfilter/nf_bpf_link.h>
+
+#include <net/tcx.h>
+
+#define IS_FD_ARRAY(map) ((map)->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY || \
+ (map)->map_type == BPF_MAP_TYPE_CGROUP_ARRAY || \
+ (map)->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS)
+#define IS_FD_PROG_ARRAY(map) ((map)->map_type == BPF_MAP_TYPE_PROG_ARRAY)
+#define IS_FD_HASH(map) ((map)->map_type == BPF_MAP_TYPE_HASH_OF_MAPS)
+#define IS_FD_MAP(map) (IS_FD_ARRAY(map) || IS_FD_PROG_ARRAY(map) || \
+ IS_FD_HASH(map))
+
+#define BPF_OBJ_FLAG_MASK (BPF_F_RDONLY | BPF_F_WRONLY)
+
+DEFINE_PER_CPU(int, bpf_prog_active);
+static DEFINE_IDR(prog_idr);
+static DEFINE_SPINLOCK(prog_idr_lock);
+static DEFINE_IDR(map_idr);
+static DEFINE_SPINLOCK(map_idr_lock);
+static DEFINE_IDR(link_idr);
+static DEFINE_SPINLOCK(link_idr_lock);
+
+int sysctl_unprivileged_bpf_disabled __read_mostly =
+ IS_BUILTIN(CONFIG_BPF_UNPRIV_DEFAULT_OFF) ? 2 : 0;
+
+static const struct bpf_map_ops * const bpf_map_types[] = {
+#define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type)
+#define BPF_MAP_TYPE(_id, _ops) \
+ [_id] = &_ops,
+#define BPF_LINK_TYPE(_id, _name)
+#include <linux/bpf_types.h>
+#undef BPF_PROG_TYPE
+#undef BPF_MAP_TYPE
+#undef BPF_LINK_TYPE
+};
+
+/*
+ * If we're handed a bigger struct than we know of, ensure all the unknown bits
+ * are 0 - i.e. new user-space does not rely on any kernel feature extensions
+ * we don't know about yet.
+ *
+ * There is a ToCToU between this function call and the following
+ * copy_from_user() call. However, this is not a concern since this function is
+ * meant to be a future-proofing of bits.
+ */
+int bpf_check_uarg_tail_zero(bpfptr_t uaddr,
+ size_t expected_size,
+ size_t actual_size)
+{
+ int res;
+
+ if (unlikely(actual_size > PAGE_SIZE)) /* silly large */
+ return -E2BIG;
+
+ if (actual_size <= expected_size)
+ return 0;
+
+ if (uaddr.is_kernel)
+ res = memchr_inv(uaddr.kernel + expected_size, 0,
+ actual_size - expected_size) == NULL;
+ else
+ res = check_zeroed_user(uaddr.user + expected_size,
+ actual_size - expected_size);
+ if (res < 0)
+ return res;
+ return res ? 0 : -E2BIG;
+}
+
+const struct bpf_map_ops bpf_map_offload_ops = {
+ .map_meta_equal = bpf_map_meta_equal,
+ .map_alloc = bpf_map_offload_map_alloc,
+ .map_free = bpf_map_offload_map_free,
+ .map_check_btf = map_check_no_btf,
+ .map_mem_usage = bpf_map_offload_map_mem_usage,
+};
+
+static void bpf_map_write_active_inc(struct bpf_map *map)
+{
+ atomic64_inc(&map->writecnt);
+}
+
+static void bpf_map_write_active_dec(struct bpf_map *map)
+{
+ atomic64_dec(&map->writecnt);
+}
+
+bool bpf_map_write_active(const struct bpf_map *map)
+{
+ return atomic64_read(&map->writecnt) != 0;
+}
+
+static u32 bpf_map_value_size(const struct bpf_map *map)
+{
+ if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
+ map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
+ map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY ||
+ map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE)
+ return round_up(map->value_size, 8) * num_possible_cpus();
+ else if (IS_FD_MAP(map))
+ return sizeof(u32);
+ else
+ return map->value_size;
+}
+
+static void maybe_wait_bpf_programs(struct bpf_map *map)
+{
+ /* Wait for any running BPF programs to complete so that
+ * userspace, when we return to it, knows that all programs
+ * that could be running use the new map value.
+ */
+ if (map->map_type == BPF_MAP_TYPE_HASH_OF_MAPS ||
+ map->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS)
+ synchronize_rcu();
+}
+
+static int bpf_map_update_value(struct bpf_map *map, struct file *map_file,
+ void *key, void *value, __u64 flags)
+{
+ int err;
+
+ /* Need to create a kthread, thus must support schedule */
+ if (bpf_map_is_offloaded(map)) {
+ return bpf_map_offload_update_elem(map, key, value, flags);
+ } else if (map->map_type == BPF_MAP_TYPE_CPUMAP ||
+ map->map_type == BPF_MAP_TYPE_STRUCT_OPS) {
+ return map->ops->map_update_elem(map, key, value, flags);
+ } else if (map->map_type == BPF_MAP_TYPE_SOCKHASH ||
+ map->map_type == BPF_MAP_TYPE_SOCKMAP) {
+ return sock_map_update_elem_sys(map, key, value, flags);
+ } else if (IS_FD_PROG_ARRAY(map)) {
+ return bpf_fd_array_map_update_elem(map, map_file, key, value,
+ flags);
+ }
+
+ bpf_disable_instrumentation();
+ if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
+ map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) {
+ err = bpf_percpu_hash_update(map, key, value, flags);
+ } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) {
+ err = bpf_percpu_array_update(map, key, value, flags);
+ } else if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) {
+ err = bpf_percpu_cgroup_storage_update(map, key, value,
+ flags);
+ } else if (IS_FD_ARRAY(map)) {
+ rcu_read_lock();
+ err = bpf_fd_array_map_update_elem(map, map_file, key, value,
+ flags);
+ rcu_read_unlock();
+ } else if (map->map_type == BPF_MAP_TYPE_HASH_OF_MAPS) {
+ rcu_read_lock();
+ err = bpf_fd_htab_map_update_elem(map, map_file, key, value,
+ flags);
+ rcu_read_unlock();
+ } else if (map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY) {
+ /* rcu_read_lock() is not needed */
+ err = bpf_fd_reuseport_array_update_elem(map, key, value,
+ flags);
+ } else if (map->map_type == BPF_MAP_TYPE_QUEUE ||
+ map->map_type == BPF_MAP_TYPE_STACK ||
+ map->map_type == BPF_MAP_TYPE_BLOOM_FILTER) {
+ err = map->ops->map_push_elem(map, value, flags);
+ } else {
+ rcu_read_lock();
+ err = map->ops->map_update_elem(map, key, value, flags);
+ rcu_read_unlock();
+ }
+ bpf_enable_instrumentation();
+ maybe_wait_bpf_programs(map);
+
+ return err;
+}
+
+static int bpf_map_copy_value(struct bpf_map *map, void *key, void *value,
+ __u64 flags)
+{
+ void *ptr;
+ int err;
+
+ if (bpf_map_is_offloaded(map))
+ return bpf_map_offload_lookup_elem(map, key, value);
+
+ bpf_disable_instrumentation();
+ if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
+ map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) {
+ err = bpf_percpu_hash_copy(map, key, value);
+ } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) {
+ err = bpf_percpu_array_copy(map, key, value);
+ } else if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) {
+ err = bpf_percpu_cgroup_storage_copy(map, key, value);
+ } else if (map->map_type == BPF_MAP_TYPE_STACK_TRACE) {
+ err = bpf_stackmap_copy(map, key, value);
+ } else if (IS_FD_ARRAY(map) || IS_FD_PROG_ARRAY(map)) {
+ err = bpf_fd_array_map_lookup_elem(map, key, value);
+ } else if (IS_FD_HASH(map)) {
+ err = bpf_fd_htab_map_lookup_elem(map, key, value);
+ } else if (map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY) {
+ err = bpf_fd_reuseport_array_lookup_elem(map, key, value);
+ } else if (map->map_type == BPF_MAP_TYPE_QUEUE ||
+ map->map_type == BPF_MAP_TYPE_STACK ||
+ map->map_type == BPF_MAP_TYPE_BLOOM_FILTER) {
+ err = map->ops->map_peek_elem(map, value);
+ } else if (map->map_type == BPF_MAP_TYPE_STRUCT_OPS) {
+ /* struct_ops map requires directly updating "value" */
+ err = bpf_struct_ops_map_sys_lookup_elem(map, key, value);
+ } else {
+ rcu_read_lock();
+ if (map->ops->map_lookup_elem_sys_only)
+ ptr = map->ops->map_lookup_elem_sys_only(map, key);
+ else
+ ptr = map->ops->map_lookup_elem(map, key);
+ if (IS_ERR(ptr)) {
+ err = PTR_ERR(ptr);
+ } else if (!ptr) {
+ err = -ENOENT;
+ } else {
+ err = 0;
+ if (flags & BPF_F_LOCK)
+ /* lock 'ptr' and copy everything but lock */
+ copy_map_value_locked(map, value, ptr, true);
+ else
+ copy_map_value(map, value, ptr);
+ /* mask lock and timer, since value wasn't zero inited */
+ check_and_init_map_value(map, value);
+ }
+ rcu_read_unlock();
+ }
+
+ bpf_enable_instrumentation();
+ maybe_wait_bpf_programs(map);
+
+ return err;
+}
+
+/* Please, do not use this function outside from the map creation path
+ * (e.g. in map update path) without taking care of setting the active
+ * memory cgroup (see at bpf_map_kmalloc_node() for example).
+ */
+static void *__bpf_map_area_alloc(u64 size, int numa_node, bool mmapable)
+{
+ /* We really just want to fail instead of triggering OOM killer
+ * under memory pressure, therefore we set __GFP_NORETRY to kmalloc,
+ * which is used for lower order allocation requests.
+ *
+ * It has been observed that higher order allocation requests done by
+ * vmalloc with __GFP_NORETRY being set might fail due to not trying
+ * to reclaim memory from the page cache, thus we set
+ * __GFP_RETRY_MAYFAIL to avoid such situations.
+ */
+
+ gfp_t gfp = bpf_memcg_flags(__GFP_NOWARN | __GFP_ZERO);
+ unsigned int flags = 0;
+ unsigned long align = 1;
+ void *area;
+
+ if (size >= SIZE_MAX)
+ return NULL;
+
+ /* kmalloc()'ed memory can't be mmap()'ed */
+ if (mmapable) {
+ BUG_ON(!PAGE_ALIGNED(size));
+ align = SHMLBA;
+ flags = VM_USERMAP;
+ } else if (size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) {
+ area = kmalloc_node(size, gfp | GFP_USER | __GFP_NORETRY,
+ numa_node);
+ if (area != NULL)
+ return area;
+ }
+
+ return __vmalloc_node_range(size, align, VMALLOC_START, VMALLOC_END,
+ gfp | GFP_KERNEL | __GFP_RETRY_MAYFAIL, PAGE_KERNEL,
+ flags, numa_node, __builtin_return_address(0));
+}
+
+void *bpf_map_area_alloc(u64 size, int numa_node)
+{
+ return __bpf_map_area_alloc(size, numa_node, false);
+}
+
+void *bpf_map_area_mmapable_alloc(u64 size, int numa_node)
+{
+ return __bpf_map_area_alloc(size, numa_node, true);
+}
+
+void bpf_map_area_free(void *area)
+{
+ kvfree(area);
+}
+
+static u32 bpf_map_flags_retain_permanent(u32 flags)
+{
+ /* Some map creation flags are not tied to the map object but
+ * rather to the map fd instead, so they have no meaning upon
+ * map object inspection since multiple file descriptors with
+ * different (access) properties can exist here. Thus, given
+ * this has zero meaning for the map itself, lets clear these
+ * from here.
+ */
+ return flags & ~(BPF_F_RDONLY | BPF_F_WRONLY);
+}
+
+void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr)
+{
+ map->map_type = attr->map_type;
+ map->key_size = attr->key_size;
+ map->value_size = attr->value_size;
+ map->max_entries = attr->max_entries;
+ map->map_flags = bpf_map_flags_retain_permanent(attr->map_flags);
+ map->numa_node = bpf_map_attr_numa_node(attr);
+ map->map_extra = attr->map_extra;
+}
+
+static int bpf_map_alloc_id(struct bpf_map *map)
+{
+ int id;
+
+ idr_preload(GFP_KERNEL);
+ spin_lock_bh(&map_idr_lock);
+ id = idr_alloc_cyclic(&map_idr, map, 1, INT_MAX, GFP_ATOMIC);
+ if (id > 0)
+ map->id = id;
+ spin_unlock_bh(&map_idr_lock);
+ idr_preload_end();
+
+ if (WARN_ON_ONCE(!id))
+ return -ENOSPC;
+
+ return id > 0 ? 0 : id;
+}
+
+void bpf_map_free_id(struct bpf_map *map)
+{
+ unsigned long flags;
+
+ /* Offloaded maps are removed from the IDR store when their device
+ * disappears - even if someone holds an fd to them they are unusable,
+ * the memory is gone, all ops will fail; they are simply waiting for
+ * refcnt to drop to be freed.
+ */
+ if (!map->id)
+ return;
+
+ spin_lock_irqsave(&map_idr_lock, flags);
+
+ idr_remove(&map_idr, map->id);
+ map->id = 0;
+
+ spin_unlock_irqrestore(&map_idr_lock, flags);
+}
+
+#ifdef CONFIG_MEMCG_KMEM
+static void bpf_map_save_memcg(struct bpf_map *map)
+{
+ /* Currently if a map is created by a process belonging to the root
+ * memory cgroup, get_obj_cgroup_from_current() will return NULL.
+ * So we have to check map->objcg for being NULL each time it's
+ * being used.
+ */
+ if (memcg_bpf_enabled())
+ map->objcg = get_obj_cgroup_from_current();
+}
+
+static void bpf_map_release_memcg(struct bpf_map *map)
+{
+ if (map->objcg)
+ obj_cgroup_put(map->objcg);
+}
+
+static struct mem_cgroup *bpf_map_get_memcg(const struct bpf_map *map)
+{
+ if (map->objcg)
+ return get_mem_cgroup_from_objcg(map->objcg);
+
+ return root_mem_cgroup;
+}
+
+void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
+ int node)
+{
+ struct mem_cgroup *memcg, *old_memcg;
+ void *ptr;
+
+ memcg = bpf_map_get_memcg(map);
+ old_memcg = set_active_memcg(memcg);
+ ptr = kmalloc_node(size, flags | __GFP_ACCOUNT, node);
+ set_active_memcg(old_memcg);
+ mem_cgroup_put(memcg);
+
+ return ptr;
+}
+
+void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags)
+{
+ struct mem_cgroup *memcg, *old_memcg;
+ void *ptr;
+
+ memcg = bpf_map_get_memcg(map);
+ old_memcg = set_active_memcg(memcg);
+ ptr = kzalloc(size, flags | __GFP_ACCOUNT);
+ set_active_memcg(old_memcg);
+ mem_cgroup_put(memcg);
+
+ return ptr;
+}
+
+void *bpf_map_kvcalloc(struct bpf_map *map, size_t n, size_t size,
+ gfp_t flags)
+{
+ struct mem_cgroup *memcg, *old_memcg;
+ void *ptr;
+
+ memcg = bpf_map_get_memcg(map);
+ old_memcg = set_active_memcg(memcg);
+ ptr = kvcalloc(n, size, flags | __GFP_ACCOUNT);
+ set_active_memcg(old_memcg);
+ mem_cgroup_put(memcg);
+
+ return ptr;
+}
+
+void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size,
+ size_t align, gfp_t flags)
+{
+ struct mem_cgroup *memcg, *old_memcg;
+ void __percpu *ptr;
+
+ memcg = bpf_map_get_memcg(map);
+ old_memcg = set_active_memcg(memcg);
+ ptr = __alloc_percpu_gfp(size, align, flags | __GFP_ACCOUNT);
+ set_active_memcg(old_memcg);
+ mem_cgroup_put(memcg);
+
+ return ptr;
+}
+
+#else
+static void bpf_map_save_memcg(struct bpf_map *map)
+{
+}
+
+static void bpf_map_release_memcg(struct bpf_map *map)
+{
+}
+#endif
+
+static int btf_field_cmp(const void *a, const void *b)
+{
+ const struct btf_field *f1 = a, *f2 = b;
+
+ if (f1->offset < f2->offset)
+ return -1;
+ else if (f1->offset > f2->offset)
+ return 1;
+ return 0;
+}
+
+struct btf_field *btf_record_find(const struct btf_record *rec, u32 offset,
+ u32 field_mask)
+{
+ struct btf_field *field;
+
+ if (IS_ERR_OR_NULL(rec) || !(rec->field_mask & field_mask))
+ return NULL;
+ field = bsearch(&offset, rec->fields, rec->cnt, sizeof(rec->fields[0]), btf_field_cmp);
+ if (!field || !(field->type & field_mask))
+ return NULL;
+ return field;
+}
+
+void btf_record_free(struct btf_record *rec)
+{
+ int i;
+
+ if (IS_ERR_OR_NULL(rec))
+ return;
+ for (i = 0; i < rec->cnt; i++) {
+ switch (rec->fields[i].type) {
+ case BPF_KPTR_UNREF:
+ case BPF_KPTR_REF:
+ if (rec->fields[i].kptr.module)
+ module_put(rec->fields[i].kptr.module);
+ btf_put(rec->fields[i].kptr.btf);
+ break;
+ case BPF_LIST_HEAD:
+ case BPF_LIST_NODE:
+ case BPF_RB_ROOT:
+ case BPF_RB_NODE:
+ case BPF_SPIN_LOCK:
+ case BPF_TIMER:
+ case BPF_REFCOUNT:
+ /* Nothing to release */
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ continue;
+ }
+ }
+ kfree(rec);
+}
+
+void bpf_map_free_record(struct bpf_map *map)
+{
+ btf_record_free(map->record);
+ map->record = NULL;
+}
+
+struct btf_record *btf_record_dup(const struct btf_record *rec)
+{
+ const struct btf_field *fields;
+ struct btf_record *new_rec;
+ int ret, size, i;
+
+ if (IS_ERR_OR_NULL(rec))
+ return NULL;
+ size = offsetof(struct btf_record, fields[rec->cnt]);
+ new_rec = kmemdup(rec, size, GFP_KERNEL | __GFP_NOWARN);
+ if (!new_rec)
+ return ERR_PTR(-ENOMEM);
+ /* Do a deep copy of the btf_record */
+ fields = rec->fields;
+ new_rec->cnt = 0;
+ for (i = 0; i < rec->cnt; i++) {
+ switch (fields[i].type) {
+ case BPF_KPTR_UNREF:
+ case BPF_KPTR_REF:
+ btf_get(fields[i].kptr.btf);
+ if (fields[i].kptr.module && !try_module_get(fields[i].kptr.module)) {
+ ret = -ENXIO;
+ goto free;
+ }
+ break;
+ case BPF_LIST_HEAD:
+ case BPF_LIST_NODE:
+ case BPF_RB_ROOT:
+ case BPF_RB_NODE:
+ case BPF_SPIN_LOCK:
+ case BPF_TIMER:
+ case BPF_REFCOUNT:
+ /* Nothing to acquire */
+ break;
+ default:
+ ret = -EFAULT;
+ WARN_ON_ONCE(1);
+ goto free;
+ }
+ new_rec->cnt++;
+ }
+ return new_rec;
+free:
+ btf_record_free(new_rec);
+ return ERR_PTR(ret);
+}
+
+bool btf_record_equal(const struct btf_record *rec_a, const struct btf_record *rec_b)
+{
+ bool a_has_fields = !IS_ERR_OR_NULL(rec_a), b_has_fields = !IS_ERR_OR_NULL(rec_b);
+ int size;
+
+ if (!a_has_fields && !b_has_fields)
+ return true;
+ if (a_has_fields != b_has_fields)
+ return false;
+ if (rec_a->cnt != rec_b->cnt)
+ return false;
+ size = offsetof(struct btf_record, fields[rec_a->cnt]);
+ /* btf_parse_fields uses kzalloc to allocate a btf_record, so unused
+ * members are zeroed out. So memcmp is safe to do without worrying
+ * about padding/unused fields.
+ *
+ * While spin_lock, timer, and kptr have no relation to map BTF,
+ * list_head metadata is specific to map BTF, the btf and value_rec
+ * members in particular. btf is the map BTF, while value_rec points to
+ * btf_record in that map BTF.
+ *
+ * So while by default, we don't rely on the map BTF (which the records
+ * were parsed from) matching for both records, which is not backwards
+ * compatible, in case list_head is part of it, we implicitly rely on
+ * that by way of depending on memcmp succeeding for it.
+ */
+ return !memcmp(rec_a, rec_b, size);
+}
+
+void bpf_obj_free_timer(const struct btf_record *rec, void *obj)
+{
+ if (WARN_ON_ONCE(!btf_record_has_field(rec, BPF_TIMER)))
+ return;
+ bpf_timer_cancel_and_free(obj + rec->timer_off);
+}
+
+extern void __bpf_obj_drop_impl(void *p, const struct btf_record *rec);
+
+void bpf_obj_free_fields(const struct btf_record *rec, void *obj)
+{
+ const struct btf_field *fields;
+ int i;
+
+ if (IS_ERR_OR_NULL(rec))
+ return;
+ fields = rec->fields;
+ for (i = 0; i < rec->cnt; i++) {
+ struct btf_struct_meta *pointee_struct_meta;
+ const struct btf_field *field = &fields[i];
+ void *field_ptr = obj + field->offset;
+ void *xchgd_field;
+
+ switch (fields[i].type) {
+ case BPF_SPIN_LOCK:
+ break;
+ case BPF_TIMER:
+ bpf_timer_cancel_and_free(field_ptr);
+ break;
+ case BPF_KPTR_UNREF:
+ WRITE_ONCE(*(u64 *)field_ptr, 0);
+ break;
+ case BPF_KPTR_REF:
+ xchgd_field = (void *)xchg((unsigned long *)field_ptr, 0);
+ if (!xchgd_field)
+ break;
+
+ if (!btf_is_kernel(field->kptr.btf)) {
+ pointee_struct_meta = btf_find_struct_meta(field->kptr.btf,
+ field->kptr.btf_id);
+ migrate_disable();
+ __bpf_obj_drop_impl(xchgd_field, pointee_struct_meta ?
+ pointee_struct_meta->record :
+ NULL);
+ migrate_enable();
+ } else {
+ field->kptr.dtor(xchgd_field);
+ }
+ break;
+ case BPF_LIST_HEAD:
+ if (WARN_ON_ONCE(rec->spin_lock_off < 0))
+ continue;
+ bpf_list_head_free(field, field_ptr, obj + rec->spin_lock_off);
+ break;
+ case BPF_RB_ROOT:
+ if (WARN_ON_ONCE(rec->spin_lock_off < 0))
+ continue;
+ bpf_rb_root_free(field, field_ptr, obj + rec->spin_lock_off);
+ break;
+ case BPF_LIST_NODE:
+ case BPF_RB_NODE:
+ case BPF_REFCOUNT:
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ continue;
+ }
+ }
+}
+
+/* called from workqueue */
+static void bpf_map_free_deferred(struct work_struct *work)
+{
+ struct bpf_map *map = container_of(work, struct bpf_map, work);
+ struct btf_record *rec = map->record;
+ struct btf *btf = map->btf;
+
+ security_bpf_map_free(map);
+ bpf_map_release_memcg(map);
+ /* implementation dependent freeing */
+ map->ops->map_free(map);
+ /* Delay freeing of btf_record for maps, as map_free
+ * callback usually needs access to them. It is better to do it here
+ * than require each callback to do the free itself manually.
+ *
+ * Note that the btf_record stashed in map->inner_map_meta->record was
+ * already freed using the map_free callback for map in map case which
+ * eventually calls bpf_map_free_meta, since inner_map_meta is only a
+ * template bpf_map struct used during verification.
+ */
+ btf_record_free(rec);
+ /* Delay freeing of btf for maps, as map_free callback may need
+ * struct_meta info which will be freed with btf_put().
+ */
+ btf_put(btf);
+}
+
+static void bpf_map_put_uref(struct bpf_map *map)
+{
+ if (atomic64_dec_and_test(&map->usercnt)) {
+ if (map->ops->map_release_uref)
+ map->ops->map_release_uref(map);
+ }
+}
+
+static void bpf_map_free_in_work(struct bpf_map *map)
+{
+ INIT_WORK(&map->work, bpf_map_free_deferred);
+ /* Avoid spawning kworkers, since they all might contend
+ * for the same mutex like slab_mutex.
+ */
+ queue_work(system_unbound_wq, &map->work);
+}
+
+static void bpf_map_free_rcu_gp(struct rcu_head *rcu)
+{
+ bpf_map_free_in_work(container_of(rcu, struct bpf_map, rcu));
+}
+
+static void bpf_map_free_mult_rcu_gp(struct rcu_head *rcu)
+{
+ if (rcu_trace_implies_rcu_gp())
+ bpf_map_free_rcu_gp(rcu);
+ else
+ call_rcu(rcu, bpf_map_free_rcu_gp);
+}
+
+/* decrement map refcnt and schedule it for freeing via workqueue
+ * (underlying map implementation ops->map_free() might sleep)
+ */
+void bpf_map_put(struct bpf_map *map)
+{
+ if (atomic64_dec_and_test(&map->refcnt)) {
+ /* bpf_map_free_id() must be called first */
+ bpf_map_free_id(map);
+
+ if (READ_ONCE(map->free_after_mult_rcu_gp))
+ call_rcu_tasks_trace(&map->rcu, bpf_map_free_mult_rcu_gp);
+ else
+ bpf_map_free_in_work(map);
+ }
+}
+EXPORT_SYMBOL_GPL(bpf_map_put);
+
+void bpf_map_put_with_uref(struct bpf_map *map)
+{
+ bpf_map_put_uref(map);
+ bpf_map_put(map);
+}
+
+static int bpf_map_release(struct inode *inode, struct file *filp)
+{
+ struct bpf_map *map = filp->private_data;
+
+ if (map->ops->map_release)
+ map->ops->map_release(map, filp);
+
+ bpf_map_put_with_uref(map);
+ return 0;
+}
+
+static fmode_t map_get_sys_perms(struct bpf_map *map, struct fd f)
+{
+ fmode_t mode = f.file->f_mode;
+
+ /* Our file permissions may have been overridden by global
+ * map permissions facing syscall side.
+ */
+ if (READ_ONCE(map->frozen))
+ mode &= ~FMODE_CAN_WRITE;
+ return mode;
+}
+
+#ifdef CONFIG_PROC_FS
+/* Show the memory usage of a bpf map */
+static u64 bpf_map_memory_usage(const struct bpf_map *map)
+{
+ return map->ops->map_mem_usage(map);
+}
+
+static void bpf_map_show_fdinfo(struct seq_file *m, struct file *filp)
+{
+ struct bpf_map *map = filp->private_data;
+ u32 type = 0, jited = 0;
+
+ if (map_type_contains_progs(map)) {
+ spin_lock(&map->owner.lock);
+ type = map->owner.type;
+ jited = map->owner.jited;
+ spin_unlock(&map->owner.lock);
+ }
+
+ seq_printf(m,
+ "map_type:\t%u\n"
+ "key_size:\t%u\n"
+ "value_size:\t%u\n"
+ "max_entries:\t%u\n"
+ "map_flags:\t%#x\n"
+ "map_extra:\t%#llx\n"
+ "memlock:\t%llu\n"
+ "map_id:\t%u\n"
+ "frozen:\t%u\n",
+ map->map_type,
+ map->key_size,
+ map->value_size,
+ map->max_entries,
+ map->map_flags,
+ (unsigned long long)map->map_extra,
+ bpf_map_memory_usage(map),
+ map->id,
+ READ_ONCE(map->frozen));
+ if (type) {
+ seq_printf(m, "owner_prog_type:\t%u\n", type);
+ seq_printf(m, "owner_jited:\t%u\n", jited);
+ }
+}
+#endif
+
+static ssize_t bpf_dummy_read(struct file *filp, char __user *buf, size_t siz,
+ loff_t *ppos)
+{
+ /* We need this handler such that alloc_file() enables
+ * f_mode with FMODE_CAN_READ.
+ */
+ return -EINVAL;
+}
+
+static ssize_t bpf_dummy_write(struct file *filp, const char __user *buf,
+ size_t siz, loff_t *ppos)
+{
+ /* We need this handler such that alloc_file() enables
+ * f_mode with FMODE_CAN_WRITE.
+ */
+ return -EINVAL;
+}
+
+/* called for any extra memory-mapped regions (except initial) */
+static void bpf_map_mmap_open(struct vm_area_struct *vma)
+{
+ struct bpf_map *map = vma->vm_file->private_data;
+
+ if (vma->vm_flags & VM_MAYWRITE)
+ bpf_map_write_active_inc(map);
+}
+
+/* called for all unmapped memory region (including initial) */
+static void bpf_map_mmap_close(struct vm_area_struct *vma)
+{
+ struct bpf_map *map = vma->vm_file->private_data;
+
+ if (vma->vm_flags & VM_MAYWRITE)
+ bpf_map_write_active_dec(map);
+}
+
+static const struct vm_operations_struct bpf_map_default_vmops = {
+ .open = bpf_map_mmap_open,
+ .close = bpf_map_mmap_close,
+};
+
+static int bpf_map_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+ struct bpf_map *map = filp->private_data;
+ int err;
+
+ if (!map->ops->map_mmap || !IS_ERR_OR_NULL(map->record))
+ return -ENOTSUPP;
+
+ if (!(vma->vm_flags & VM_SHARED))
+ return -EINVAL;
+
+ mutex_lock(&map->freeze_mutex);
+
+ if (vma->vm_flags & VM_WRITE) {
+ if (map->frozen) {
+ err = -EPERM;
+ goto out;
+ }
+ /* map is meant to be read-only, so do not allow mapping as
+ * writable, because it's possible to leak a writable page
+ * reference and allows user-space to still modify it after
+ * freezing, while verifier will assume contents do not change
+ */
+ if (map->map_flags & BPF_F_RDONLY_PROG) {
+ err = -EACCES;
+ goto out;
+ }
+ }
+
+ /* set default open/close callbacks */
+ vma->vm_ops = &bpf_map_default_vmops;
+ vma->vm_private_data = map;
+ vm_flags_clear(vma, VM_MAYEXEC);
+ if (!(vma->vm_flags & VM_WRITE))
+ /* disallow re-mapping with PROT_WRITE */
+ vm_flags_clear(vma, VM_MAYWRITE);
+
+ err = map->ops->map_mmap(map, vma);
+ if (err)
+ goto out;
+
+ if (vma->vm_flags & VM_MAYWRITE)
+ bpf_map_write_active_inc(map);
+out:
+ mutex_unlock(&map->freeze_mutex);
+ return err;
+}
+
+static __poll_t bpf_map_poll(struct file *filp, struct poll_table_struct *pts)
+{
+ struct bpf_map *map = filp->private_data;
+
+ if (map->ops->map_poll)
+ return map->ops->map_poll(map, filp, pts);
+
+ return EPOLLERR;
+}
+
+const struct file_operations bpf_map_fops = {
+#ifdef CONFIG_PROC_FS
+ .show_fdinfo = bpf_map_show_fdinfo,
+#endif
+ .release = bpf_map_release,
+ .read = bpf_dummy_read,
+ .write = bpf_dummy_write,
+ .mmap = bpf_map_mmap,
+ .poll = bpf_map_poll,
+};
+
+int bpf_map_new_fd(struct bpf_map *map, int flags)
+{
+ int ret;
+
+ ret = security_bpf_map(map, OPEN_FMODE(flags));
+ if (ret < 0)
+ return ret;
+
+ return anon_inode_getfd("bpf-map", &bpf_map_fops, map,
+ flags | O_CLOEXEC);
+}
+
+int bpf_get_file_flag(int flags)
+{
+ if ((flags & BPF_F_RDONLY) && (flags & BPF_F_WRONLY))
+ return -EINVAL;
+ if (flags & BPF_F_RDONLY)
+ return O_RDONLY;
+ if (flags & BPF_F_WRONLY)
+ return O_WRONLY;
+ return O_RDWR;
+}
+
+/* helper macro to check that unused fields 'union bpf_attr' are zero */
+#define CHECK_ATTR(CMD) \
+ memchr_inv((void *) &attr->CMD##_LAST_FIELD + \
+ sizeof(attr->CMD##_LAST_FIELD), 0, \
+ sizeof(*attr) - \
+ offsetof(union bpf_attr, CMD##_LAST_FIELD) - \
+ sizeof(attr->CMD##_LAST_FIELD)) != NULL
+
+/* dst and src must have at least "size" number of bytes.
+ * Return strlen on success and < 0 on error.
+ */
+int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size)
+{
+ const char *end = src + size;
+ const char *orig_src = src;
+
+ memset(dst, 0, size);
+ /* Copy all isalnum(), '_' and '.' chars. */
+ while (src < end && *src) {
+ if (!isalnum(*src) &&
+ *src != '_' && *src != '.')
+ return -EINVAL;
+ *dst++ = *src++;
+ }
+
+ /* No '\0' found in "size" number of bytes */
+ if (src == end)
+ return -EINVAL;
+
+ return src - orig_src;
+}
+
+int map_check_no_btf(const struct bpf_map *map,
+ const struct btf *btf,
+ const struct btf_type *key_type,
+ const struct btf_type *value_type)
+{
+ return -ENOTSUPP;
+}
+
+static int map_check_btf(struct bpf_map *map, const struct btf *btf,
+ u32 btf_key_id, u32 btf_value_id)
+{
+ const struct btf_type *key_type, *value_type;
+ u32 key_size, value_size;
+ int ret = 0;
+
+ /* Some maps allow key to be unspecified. */
+ if (btf_key_id) {
+ key_type = btf_type_id_size(btf, &btf_key_id, &key_size);
+ if (!key_type || key_size != map->key_size)
+ return -EINVAL;
+ } else {
+ key_type = btf_type_by_id(btf, 0);
+ if (!map->ops->map_check_btf)
+ return -EINVAL;
+ }
+
+ value_type = btf_type_id_size(btf, &btf_value_id, &value_size);
+ if (!value_type || value_size != map->value_size)
+ return -EINVAL;
+
+ map->record = btf_parse_fields(btf, value_type,
+ BPF_SPIN_LOCK | BPF_TIMER | BPF_KPTR | BPF_LIST_HEAD |
+ BPF_RB_ROOT | BPF_REFCOUNT,
+ map->value_size);
+ if (!IS_ERR_OR_NULL(map->record)) {
+ int i;
+
+ if (!bpf_capable()) {
+ ret = -EPERM;
+ goto free_map_tab;
+ }
+ if (map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) {
+ ret = -EACCES;
+ goto free_map_tab;
+ }
+ for (i = 0; i < sizeof(map->record->field_mask) * 8; i++) {
+ switch (map->record->field_mask & (1 << i)) {
+ case 0:
+ continue;
+ case BPF_SPIN_LOCK:
+ if (map->map_type != BPF_MAP_TYPE_HASH &&
+ map->map_type != BPF_MAP_TYPE_ARRAY &&
+ map->map_type != BPF_MAP_TYPE_CGROUP_STORAGE &&
+ map->map_type != BPF_MAP_TYPE_SK_STORAGE &&
+ map->map_type != BPF_MAP_TYPE_INODE_STORAGE &&
+ map->map_type != BPF_MAP_TYPE_TASK_STORAGE &&
+ map->map_type != BPF_MAP_TYPE_CGRP_STORAGE) {
+ ret = -EOPNOTSUPP;
+ goto free_map_tab;
+ }
+ break;
+ case BPF_TIMER:
+ if (map->map_type != BPF_MAP_TYPE_HASH &&
+ map->map_type != BPF_MAP_TYPE_LRU_HASH &&
+ map->map_type != BPF_MAP_TYPE_ARRAY) {
+ ret = -EOPNOTSUPP;
+ goto free_map_tab;
+ }
+ break;
+ case BPF_KPTR_UNREF:
+ case BPF_KPTR_REF:
+ case BPF_REFCOUNT:
+ if (map->map_type != BPF_MAP_TYPE_HASH &&
+ map->map_type != BPF_MAP_TYPE_PERCPU_HASH &&
+ map->map_type != BPF_MAP_TYPE_LRU_HASH &&
+ map->map_type != BPF_MAP_TYPE_LRU_PERCPU_HASH &&
+ map->map_type != BPF_MAP_TYPE_ARRAY &&
+ map->map_type != BPF_MAP_TYPE_PERCPU_ARRAY &&
+ map->map_type != BPF_MAP_TYPE_SK_STORAGE &&
+ map->map_type != BPF_MAP_TYPE_INODE_STORAGE &&
+ map->map_type != BPF_MAP_TYPE_TASK_STORAGE &&
+ map->map_type != BPF_MAP_TYPE_CGRP_STORAGE) {
+ ret = -EOPNOTSUPP;
+ goto free_map_tab;
+ }
+ break;
+ case BPF_LIST_HEAD:
+ case BPF_RB_ROOT:
+ if (map->map_type != BPF_MAP_TYPE_HASH &&
+ map->map_type != BPF_MAP_TYPE_LRU_HASH &&
+ map->map_type != BPF_MAP_TYPE_ARRAY) {
+ ret = -EOPNOTSUPP;
+ goto free_map_tab;
+ }
+ break;
+ default:
+ /* Fail if map_type checks are missing for a field type */
+ ret = -EOPNOTSUPP;
+ goto free_map_tab;
+ }
+ }
+ }
+
+ ret = btf_check_and_fixup_fields(btf, map->record);
+ if (ret < 0)
+ goto free_map_tab;
+
+ if (map->ops->map_check_btf) {
+ ret = map->ops->map_check_btf(map, btf, key_type, value_type);
+ if (ret < 0)
+ goto free_map_tab;
+ }
+
+ return ret;
+free_map_tab:
+ bpf_map_free_record(map);
+ return ret;
+}
+
+#define BPF_MAP_CREATE_LAST_FIELD map_extra
+/* called via syscall */
+static int map_create(union bpf_attr *attr)
+{
+ const struct bpf_map_ops *ops;
+ int numa_node = bpf_map_attr_numa_node(attr);
+ u32 map_type = attr->map_type;
+ struct bpf_map *map;
+ int f_flags;
+ int err;
+
+ err = CHECK_ATTR(BPF_MAP_CREATE);
+ if (err)
+ return -EINVAL;
+
+ if (attr->btf_vmlinux_value_type_id) {
+ if (attr->map_type != BPF_MAP_TYPE_STRUCT_OPS ||
+ attr->btf_key_type_id || attr->btf_value_type_id)
+ return -EINVAL;
+ } else if (attr->btf_key_type_id && !attr->btf_value_type_id) {
+ return -EINVAL;
+ }
+
+ if (attr->map_type != BPF_MAP_TYPE_BLOOM_FILTER &&
+ attr->map_extra != 0)
+ return -EINVAL;
+
+ f_flags = bpf_get_file_flag(attr->map_flags);
+ if (f_flags < 0)
+ return f_flags;
+
+ if (numa_node != NUMA_NO_NODE &&
+ ((unsigned int)numa_node >= nr_node_ids ||
+ !node_online(numa_node)))
+ return -EINVAL;
+
+ /* find map type and init map: hashtable vs rbtree vs bloom vs ... */
+ map_type = attr->map_type;
+ if (map_type >= ARRAY_SIZE(bpf_map_types))
+ return -EINVAL;
+ map_type = array_index_nospec(map_type, ARRAY_SIZE(bpf_map_types));
+ ops = bpf_map_types[map_type];
+ if (!ops)
+ return -EINVAL;
+
+ if (ops->map_alloc_check) {
+ err = ops->map_alloc_check(attr);
+ if (err)
+ return err;
+ }
+ if (attr->map_ifindex)
+ ops = &bpf_map_offload_ops;
+ if (!ops->map_mem_usage)
+ return -EINVAL;
+
+ /* Intent here is for unprivileged_bpf_disabled to block BPF map
+ * creation for unprivileged users; other actions depend
+ * on fd availability and access to bpffs, so are dependent on
+ * object creation success. Even with unprivileged BPF disabled,
+ * capability checks are still carried out.
+ */
+ if (sysctl_unprivileged_bpf_disabled && !bpf_capable())
+ return -EPERM;
+
+ /* check privileged map type permissions */
+ switch (map_type) {
+ case BPF_MAP_TYPE_ARRAY:
+ case BPF_MAP_TYPE_PERCPU_ARRAY:
+ case BPF_MAP_TYPE_PROG_ARRAY:
+ case BPF_MAP_TYPE_PERF_EVENT_ARRAY:
+ case BPF_MAP_TYPE_CGROUP_ARRAY:
+ case BPF_MAP_TYPE_ARRAY_OF_MAPS:
+ case BPF_MAP_TYPE_HASH:
+ case BPF_MAP_TYPE_PERCPU_HASH:
+ case BPF_MAP_TYPE_HASH_OF_MAPS:
+ case BPF_MAP_TYPE_RINGBUF:
+ case BPF_MAP_TYPE_USER_RINGBUF:
+ case BPF_MAP_TYPE_CGROUP_STORAGE:
+ case BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE:
+ /* unprivileged */
+ break;
+ case BPF_MAP_TYPE_SK_STORAGE:
+ case BPF_MAP_TYPE_INODE_STORAGE:
+ case BPF_MAP_TYPE_TASK_STORAGE:
+ case BPF_MAP_TYPE_CGRP_STORAGE:
+ case BPF_MAP_TYPE_BLOOM_FILTER:
+ case BPF_MAP_TYPE_LPM_TRIE:
+ case BPF_MAP_TYPE_REUSEPORT_SOCKARRAY:
+ case BPF_MAP_TYPE_STACK_TRACE:
+ case BPF_MAP_TYPE_QUEUE:
+ case BPF_MAP_TYPE_STACK:
+ case BPF_MAP_TYPE_LRU_HASH:
+ case BPF_MAP_TYPE_LRU_PERCPU_HASH:
+ case BPF_MAP_TYPE_STRUCT_OPS:
+ case BPF_MAP_TYPE_CPUMAP:
+ if (!bpf_capable())
+ return -EPERM;
+ break;
+ case BPF_MAP_TYPE_SOCKMAP:
+ case BPF_MAP_TYPE_SOCKHASH:
+ case BPF_MAP_TYPE_DEVMAP:
+ case BPF_MAP_TYPE_DEVMAP_HASH:
+ case BPF_MAP_TYPE_XSKMAP:
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+ break;
+ default:
+ WARN(1, "unsupported map type %d", map_type);
+ return -EPERM;
+ }
+
+ map = ops->map_alloc(attr);
+ if (IS_ERR(map))
+ return PTR_ERR(map);
+ map->ops = ops;
+ map->map_type = map_type;
+
+ err = bpf_obj_name_cpy(map->name, attr->map_name,
+ sizeof(attr->map_name));
+ if (err < 0)
+ goto free_map;
+
+ atomic64_set(&map->refcnt, 1);
+ atomic64_set(&map->usercnt, 1);
+ mutex_init(&map->freeze_mutex);
+ spin_lock_init(&map->owner.lock);
+
+ if (attr->btf_key_type_id || attr->btf_value_type_id ||
+ /* Even the map's value is a kernel's struct,
+ * the bpf_prog.o must have BTF to begin with
+ * to figure out the corresponding kernel's
+ * counter part. Thus, attr->btf_fd has
+ * to be valid also.
+ */
+ attr->btf_vmlinux_value_type_id) {
+ struct btf *btf;
+
+ btf = btf_get_by_fd(attr->btf_fd);
+ if (IS_ERR(btf)) {
+ err = PTR_ERR(btf);
+ goto free_map;
+ }
+ if (btf_is_kernel(btf)) {
+ btf_put(btf);
+ err = -EACCES;
+ goto free_map;
+ }
+ map->btf = btf;
+
+ if (attr->btf_value_type_id) {
+ err = map_check_btf(map, btf, attr->btf_key_type_id,
+ attr->btf_value_type_id);
+ if (err)
+ goto free_map;
+ }
+
+ map->btf_key_type_id = attr->btf_key_type_id;
+ map->btf_value_type_id = attr->btf_value_type_id;
+ map->btf_vmlinux_value_type_id =
+ attr->btf_vmlinux_value_type_id;
+ }
+
+ err = security_bpf_map_alloc(map);
+ if (err)
+ goto free_map;
+
+ err = bpf_map_alloc_id(map);
+ if (err)
+ goto free_map_sec;
+
+ bpf_map_save_memcg(map);
+
+ err = bpf_map_new_fd(map, f_flags);
+ if (err < 0) {
+ /* failed to allocate fd.
+ * bpf_map_put_with_uref() is needed because the above
+ * bpf_map_alloc_id() has published the map
+ * to the userspace and the userspace may
+ * have refcnt-ed it through BPF_MAP_GET_FD_BY_ID.
+ */
+ bpf_map_put_with_uref(map);
+ return err;
+ }
+
+ return err;
+
+free_map_sec:
+ security_bpf_map_free(map);
+free_map:
+ btf_put(map->btf);
+ map->ops->map_free(map);
+ return err;
+}
+
+/* if error is returned, fd is released.
+ * On success caller should complete fd access with matching fdput()
+ */
+struct bpf_map *__bpf_map_get(struct fd f)
+{
+ if (!f.file)
+ return ERR_PTR(-EBADF);
+ if (f.file->f_op != &bpf_map_fops) {
+ fdput(f);
+ return ERR_PTR(-EINVAL);
+ }
+
+ return f.file->private_data;
+}
+
+void bpf_map_inc(struct bpf_map *map)
+{
+ atomic64_inc(&map->refcnt);
+}
+EXPORT_SYMBOL_GPL(bpf_map_inc);
+
+void bpf_map_inc_with_uref(struct bpf_map *map)
+{
+ atomic64_inc(&map->refcnt);
+ atomic64_inc(&map->usercnt);
+}
+EXPORT_SYMBOL_GPL(bpf_map_inc_with_uref);
+
+struct bpf_map *bpf_map_get(u32 ufd)
+{
+ struct fd f = fdget(ufd);
+ struct bpf_map *map;
+
+ map = __bpf_map_get(f);
+ if (IS_ERR(map))
+ return map;
+
+ bpf_map_inc(map);
+ fdput(f);
+
+ return map;
+}
+EXPORT_SYMBOL(bpf_map_get);
+
+struct bpf_map *bpf_map_get_with_uref(u32 ufd)
+{
+ struct fd f = fdget(ufd);
+ struct bpf_map *map;
+
+ map = __bpf_map_get(f);
+ if (IS_ERR(map))
+ return map;
+
+ bpf_map_inc_with_uref(map);
+ fdput(f);
+
+ return map;
+}
+
+/* map_idr_lock should have been held or the map should have been
+ * protected by rcu read lock.
+ */
+struct bpf_map *__bpf_map_inc_not_zero(struct bpf_map *map, bool uref)
+{
+ int refold;
+
+ refold = atomic64_fetch_add_unless(&map->refcnt, 1, 0);
+ if (!refold)
+ return ERR_PTR(-ENOENT);
+ if (uref)
+ atomic64_inc(&map->usercnt);
+
+ return map;
+}
+
+struct bpf_map *bpf_map_inc_not_zero(struct bpf_map *map)
+{
+ spin_lock_bh(&map_idr_lock);
+ map = __bpf_map_inc_not_zero(map, false);
+ spin_unlock_bh(&map_idr_lock);
+
+ return map;
+}
+EXPORT_SYMBOL_GPL(bpf_map_inc_not_zero);
+
+int __weak bpf_stackmap_copy(struct bpf_map *map, void *key, void *value)
+{
+ return -ENOTSUPP;
+}
+
+static void *__bpf_copy_key(void __user *ukey, u64 key_size)
+{
+ if (key_size)
+ return vmemdup_user(ukey, key_size);
+
+ if (ukey)
+ return ERR_PTR(-EINVAL);
+
+ return NULL;
+}
+
+static void *___bpf_copy_key(bpfptr_t ukey, u64 key_size)
+{
+ if (key_size)
+ return kvmemdup_bpfptr(ukey, key_size);
+
+ if (!bpfptr_is_null(ukey))
+ return ERR_PTR(-EINVAL);
+
+ return NULL;
+}
+
+/* last field in 'union bpf_attr' used by this command */
+#define BPF_MAP_LOOKUP_ELEM_LAST_FIELD flags
+
+static int map_lookup_elem(union bpf_attr *attr)
+{
+ void __user *ukey = u64_to_user_ptr(attr->key);
+ void __user *uvalue = u64_to_user_ptr(attr->value);
+ int ufd = attr->map_fd;
+ struct bpf_map *map;
+ void *key, *value;
+ u32 value_size;
+ struct fd f;
+ int err;
+
+ if (CHECK_ATTR(BPF_MAP_LOOKUP_ELEM))
+ return -EINVAL;
+
+ if (attr->flags & ~BPF_F_LOCK)
+ return -EINVAL;
+
+ f = fdget(ufd);
+ map = __bpf_map_get(f);
+ if (IS_ERR(map))
+ return PTR_ERR(map);
+ if (!(map_get_sys_perms(map, f) & FMODE_CAN_READ)) {
+ err = -EPERM;
+ goto err_put;
+ }
+
+ if ((attr->flags & BPF_F_LOCK) &&
+ !btf_record_has_field(map->record, BPF_SPIN_LOCK)) {
+ err = -EINVAL;
+ goto err_put;
+ }
+
+ key = __bpf_copy_key(ukey, map->key_size);
+ if (IS_ERR(key)) {
+ err = PTR_ERR(key);
+ goto err_put;
+ }
+
+ value_size = bpf_map_value_size(map);
+
+ err = -ENOMEM;
+ value = kvmalloc(value_size, GFP_USER | __GFP_NOWARN);
+ if (!value)
+ goto free_key;
+
+ if (map->map_type == BPF_MAP_TYPE_BLOOM_FILTER) {
+ if (copy_from_user(value, uvalue, value_size))
+ err = -EFAULT;
+ else
+ err = bpf_map_copy_value(map, key, value, attr->flags);
+ goto free_value;
+ }
+
+ err = bpf_map_copy_value(map, key, value, attr->flags);
+ if (err)
+ goto free_value;
+
+ err = -EFAULT;
+ if (copy_to_user(uvalue, value, value_size) != 0)
+ goto free_value;
+
+ err = 0;
+
+free_value:
+ kvfree(value);
+free_key:
+ kvfree(key);
+err_put:
+ fdput(f);
+ return err;
+}
+
+
+#define BPF_MAP_UPDATE_ELEM_LAST_FIELD flags
+
+static int map_update_elem(union bpf_attr *attr, bpfptr_t uattr)
+{
+ bpfptr_t ukey = make_bpfptr(attr->key, uattr.is_kernel);
+ bpfptr_t uvalue = make_bpfptr(attr->value, uattr.is_kernel);
+ int ufd = attr->map_fd;
+ struct bpf_map *map;
+ void *key, *value;
+ u32 value_size;
+ struct fd f;
+ int err;
+
+ if (CHECK_ATTR(BPF_MAP_UPDATE_ELEM))
+ return -EINVAL;
+
+ f = fdget(ufd);
+ map = __bpf_map_get(f);
+ if (IS_ERR(map))
+ return PTR_ERR(map);
+ bpf_map_write_active_inc(map);
+ if (!(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
+ err = -EPERM;
+ goto err_put;
+ }
+
+ if ((attr->flags & BPF_F_LOCK) &&
+ !btf_record_has_field(map->record, BPF_SPIN_LOCK)) {
+ err = -EINVAL;
+ goto err_put;
+ }
+
+ key = ___bpf_copy_key(ukey, map->key_size);
+ if (IS_ERR(key)) {
+ err = PTR_ERR(key);
+ goto err_put;
+ }
+
+ value_size = bpf_map_value_size(map);
+ value = kvmemdup_bpfptr(uvalue, value_size);
+ if (IS_ERR(value)) {
+ err = PTR_ERR(value);
+ goto free_key;
+ }
+
+ err = bpf_map_update_value(map, f.file, key, value, attr->flags);
+
+ kvfree(value);
+free_key:
+ kvfree(key);
+err_put:
+ bpf_map_write_active_dec(map);
+ fdput(f);
+ return err;
+}
+
+#define BPF_MAP_DELETE_ELEM_LAST_FIELD key
+
+static int map_delete_elem(union bpf_attr *attr, bpfptr_t uattr)
+{
+ bpfptr_t ukey = make_bpfptr(attr->key, uattr.is_kernel);
+ int ufd = attr->map_fd;
+ struct bpf_map *map;
+ struct fd f;
+ void *key;
+ int err;
+
+ if (CHECK_ATTR(BPF_MAP_DELETE_ELEM))
+ return -EINVAL;
+
+ f = fdget(ufd);
+ map = __bpf_map_get(f);
+ if (IS_ERR(map))
+ return PTR_ERR(map);
+ bpf_map_write_active_inc(map);
+ if (!(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
+ err = -EPERM;
+ goto err_put;
+ }
+
+ key = ___bpf_copy_key(ukey, map->key_size);
+ if (IS_ERR(key)) {
+ err = PTR_ERR(key);
+ goto err_put;
+ }
+
+ if (bpf_map_is_offloaded(map)) {
+ err = bpf_map_offload_delete_elem(map, key);
+ goto out;
+ } else if (IS_FD_PROG_ARRAY(map) ||
+ map->map_type == BPF_MAP_TYPE_STRUCT_OPS) {
+ /* These maps require sleepable context */
+ err = map->ops->map_delete_elem(map, key);
+ goto out;
+ }
+
+ bpf_disable_instrumentation();
+ rcu_read_lock();
+ err = map->ops->map_delete_elem(map, key);
+ rcu_read_unlock();
+ bpf_enable_instrumentation();
+ maybe_wait_bpf_programs(map);
+out:
+ kvfree(key);
+err_put:
+ bpf_map_write_active_dec(map);
+ fdput(f);
+ return err;
+}
+
+/* last field in 'union bpf_attr' used by this command */
+#define BPF_MAP_GET_NEXT_KEY_LAST_FIELD next_key
+
+static int map_get_next_key(union bpf_attr *attr)
+{
+ void __user *ukey = u64_to_user_ptr(attr->key);
+ void __user *unext_key = u64_to_user_ptr(attr->next_key);
+ int ufd = attr->map_fd;
+ struct bpf_map *map;
+ void *key, *next_key;
+ struct fd f;
+ int err;
+
+ if (CHECK_ATTR(BPF_MAP_GET_NEXT_KEY))
+ return -EINVAL;
+
+ f = fdget(ufd);
+ map = __bpf_map_get(f);
+ if (IS_ERR(map))
+ return PTR_ERR(map);
+ if (!(map_get_sys_perms(map, f) & FMODE_CAN_READ)) {
+ err = -EPERM;
+ goto err_put;
+ }
+
+ if (ukey) {
+ key = __bpf_copy_key(ukey, map->key_size);
+ if (IS_ERR(key)) {
+ err = PTR_ERR(key);
+ goto err_put;
+ }
+ } else {
+ key = NULL;
+ }
+
+ err = -ENOMEM;
+ next_key = kvmalloc(map->key_size, GFP_USER);
+ if (!next_key)
+ goto free_key;
+
+ if (bpf_map_is_offloaded(map)) {
+ err = bpf_map_offload_get_next_key(map, key, next_key);
+ goto out;
+ }
+
+ rcu_read_lock();
+ err = map->ops->map_get_next_key(map, key, next_key);
+ rcu_read_unlock();
+out:
+ if (err)
+ goto free_next_key;
+
+ err = -EFAULT;
+ if (copy_to_user(unext_key, next_key, map->key_size) != 0)
+ goto free_next_key;
+
+ err = 0;
+
+free_next_key:
+ kvfree(next_key);
+free_key:
+ kvfree(key);
+err_put:
+ fdput(f);
+ return err;
+}
+
+int generic_map_delete_batch(struct bpf_map *map,
+ const union bpf_attr *attr,
+ union bpf_attr __user *uattr)
+{
+ void __user *keys = u64_to_user_ptr(attr->batch.keys);
+ u32 cp, max_count;
+ int err = 0;
+ void *key;
+
+ if (attr->batch.elem_flags & ~BPF_F_LOCK)
+ return -EINVAL;
+
+ if ((attr->batch.elem_flags & BPF_F_LOCK) &&
+ !btf_record_has_field(map->record, BPF_SPIN_LOCK)) {
+ return -EINVAL;
+ }
+
+ max_count = attr->batch.count;
+ if (!max_count)
+ return 0;
+
+ key = kvmalloc(map->key_size, GFP_USER | __GFP_NOWARN);
+ if (!key)
+ return -ENOMEM;
+
+ for (cp = 0; cp < max_count; cp++) {
+ err = -EFAULT;
+ if (copy_from_user(key, keys + cp * map->key_size,
+ map->key_size))
+ break;
+
+ if (bpf_map_is_offloaded(map)) {
+ err = bpf_map_offload_delete_elem(map, key);
+ break;
+ }
+
+ bpf_disable_instrumentation();
+ rcu_read_lock();
+ err = map->ops->map_delete_elem(map, key);
+ rcu_read_unlock();
+ bpf_enable_instrumentation();
+ if (err)
+ break;
+ cond_resched();
+ }
+ if (copy_to_user(&uattr->batch.count, &cp, sizeof(cp)))
+ err = -EFAULT;
+
+ kvfree(key);
+
+ maybe_wait_bpf_programs(map);
+ return err;
+}
+
+int generic_map_update_batch(struct bpf_map *map, struct file *map_file,
+ const union bpf_attr *attr,
+ union bpf_attr __user *uattr)
+{
+ void __user *values = u64_to_user_ptr(attr->batch.values);
+ void __user *keys = u64_to_user_ptr(attr->batch.keys);
+ u32 value_size, cp, max_count;
+ void *key, *value;
+ int err = 0;
+
+ if (attr->batch.elem_flags & ~BPF_F_LOCK)
+ return -EINVAL;
+
+ if ((attr->batch.elem_flags & BPF_F_LOCK) &&
+ !btf_record_has_field(map->record, BPF_SPIN_LOCK)) {
+ return -EINVAL;
+ }
+
+ value_size = bpf_map_value_size(map);
+
+ max_count = attr->batch.count;
+ if (!max_count)
+ return 0;
+
+ key = kvmalloc(map->key_size, GFP_USER | __GFP_NOWARN);
+ if (!key)
+ return -ENOMEM;
+
+ value = kvmalloc(value_size, GFP_USER | __GFP_NOWARN);
+ if (!value) {
+ kvfree(key);
+ return -ENOMEM;
+ }
+
+ for (cp = 0; cp < max_count; cp++) {
+ err = -EFAULT;
+ if (copy_from_user(key, keys + cp * map->key_size,
+ map->key_size) ||
+ copy_from_user(value, values + cp * value_size, value_size))
+ break;
+
+ err = bpf_map_update_value(map, map_file, key, value,
+ attr->batch.elem_flags);
+
+ if (err)
+ break;
+ cond_resched();
+ }
+
+ if (copy_to_user(&uattr->batch.count, &cp, sizeof(cp)))
+ err = -EFAULT;
+
+ kvfree(value);
+ kvfree(key);
+ return err;
+}
+
+#define MAP_LOOKUP_RETRIES 3
+
+int generic_map_lookup_batch(struct bpf_map *map,
+ const union bpf_attr *attr,
+ union bpf_attr __user *uattr)
+{
+ void __user *uobatch = u64_to_user_ptr(attr->batch.out_batch);
+ void __user *ubatch = u64_to_user_ptr(attr->batch.in_batch);
+ void __user *values = u64_to_user_ptr(attr->batch.values);
+ void __user *keys = u64_to_user_ptr(attr->batch.keys);
+ void *buf, *buf_prevkey, *prev_key, *key, *value;
+ int err, retry = MAP_LOOKUP_RETRIES;
+ u32 value_size, cp, max_count;
+
+ if (attr->batch.elem_flags & ~BPF_F_LOCK)
+ return -EINVAL;
+
+ if ((attr->batch.elem_flags & BPF_F_LOCK) &&
+ !btf_record_has_field(map->record, BPF_SPIN_LOCK))
+ return -EINVAL;
+
+ value_size = bpf_map_value_size(map);
+
+ max_count = attr->batch.count;
+ if (!max_count)
+ return 0;
+
+ if (put_user(0, &uattr->batch.count))
+ return -EFAULT;
+
+ buf_prevkey = kvmalloc(map->key_size, GFP_USER | __GFP_NOWARN);
+ if (!buf_prevkey)
+ return -ENOMEM;
+
+ buf = kvmalloc(map->key_size + value_size, GFP_USER | __GFP_NOWARN);
+ if (!buf) {
+ kvfree(buf_prevkey);
+ return -ENOMEM;
+ }
+
+ err = -EFAULT;
+ prev_key = NULL;
+ if (ubatch && copy_from_user(buf_prevkey, ubatch, map->key_size))
+ goto free_buf;
+ key = buf;
+ value = key + map->key_size;
+ if (ubatch)
+ prev_key = buf_prevkey;
+
+ for (cp = 0; cp < max_count;) {
+ rcu_read_lock();
+ err = map->ops->map_get_next_key(map, prev_key, key);
+ rcu_read_unlock();
+ if (err)
+ break;
+ err = bpf_map_copy_value(map, key, value,
+ attr->batch.elem_flags);
+
+ if (err == -ENOENT) {
+ if (retry) {
+ retry--;
+ continue;
+ }
+ err = -EINTR;
+ break;
+ }
+
+ if (err)
+ goto free_buf;
+
+ if (copy_to_user(keys + cp * map->key_size, key,
+ map->key_size)) {
+ err = -EFAULT;
+ goto free_buf;
+ }
+ if (copy_to_user(values + cp * value_size, value, value_size)) {
+ err = -EFAULT;
+ goto free_buf;
+ }
+
+ if (!prev_key)
+ prev_key = buf_prevkey;
+
+ swap(prev_key, key);
+ retry = MAP_LOOKUP_RETRIES;
+ cp++;
+ cond_resched();
+ }
+
+ if (err == -EFAULT)
+ goto free_buf;
+
+ if ((copy_to_user(&uattr->batch.count, &cp, sizeof(cp)) ||
+ (cp && copy_to_user(uobatch, prev_key, map->key_size))))
+ err = -EFAULT;
+
+free_buf:
+ kvfree(buf_prevkey);
+ kvfree(buf);
+ return err;
+}
+
+#define BPF_MAP_LOOKUP_AND_DELETE_ELEM_LAST_FIELD flags
+
+static int map_lookup_and_delete_elem(union bpf_attr *attr)
+{
+ void __user *ukey = u64_to_user_ptr(attr->key);
+ void __user *uvalue = u64_to_user_ptr(attr->value);
+ int ufd = attr->map_fd;
+ struct bpf_map *map;
+ void *key, *value;
+ u32 value_size;
+ struct fd f;
+ int err;
+
+ if (CHECK_ATTR(BPF_MAP_LOOKUP_AND_DELETE_ELEM))
+ return -EINVAL;
+
+ if (attr->flags & ~BPF_F_LOCK)
+ return -EINVAL;
+
+ f = fdget(ufd);
+ map = __bpf_map_get(f);
+ if (IS_ERR(map))
+ return PTR_ERR(map);
+ bpf_map_write_active_inc(map);
+ if (!(map_get_sys_perms(map, f) & FMODE_CAN_READ) ||
+ !(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
+ err = -EPERM;
+ goto err_put;
+ }
+
+ if (attr->flags &&
+ (map->map_type == BPF_MAP_TYPE_QUEUE ||
+ map->map_type == BPF_MAP_TYPE_STACK)) {
+ err = -EINVAL;
+ goto err_put;
+ }
+
+ if ((attr->flags & BPF_F_LOCK) &&
+ !btf_record_has_field(map->record, BPF_SPIN_LOCK)) {
+ err = -EINVAL;
+ goto err_put;
+ }
+
+ key = __bpf_copy_key(ukey, map->key_size);
+ if (IS_ERR(key)) {
+ err = PTR_ERR(key);
+ goto err_put;
+ }
+
+ value_size = bpf_map_value_size(map);
+
+ err = -ENOMEM;
+ value = kvmalloc(value_size, GFP_USER | __GFP_NOWARN);
+ if (!value)
+ goto free_key;
+
+ err = -ENOTSUPP;
+ if (map->map_type == BPF_MAP_TYPE_QUEUE ||
+ map->map_type == BPF_MAP_TYPE_STACK) {
+ err = map->ops->map_pop_elem(map, value);
+ } else if (map->map_type == BPF_MAP_TYPE_HASH ||
+ map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
+ map->map_type == BPF_MAP_TYPE_LRU_HASH ||
+ map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) {
+ if (!bpf_map_is_offloaded(map)) {
+ bpf_disable_instrumentation();
+ rcu_read_lock();
+ err = map->ops->map_lookup_and_delete_elem(map, key, value, attr->flags);
+ rcu_read_unlock();
+ bpf_enable_instrumentation();
+ }
+ }
+
+ if (err)
+ goto free_value;
+
+ if (copy_to_user(uvalue, value, value_size) != 0) {
+ err = -EFAULT;
+ goto free_value;
+ }
+
+ err = 0;
+
+free_value:
+ kvfree(value);
+free_key:
+ kvfree(key);
+err_put:
+ bpf_map_write_active_dec(map);
+ fdput(f);
+ return err;
+}
+
+#define BPF_MAP_FREEZE_LAST_FIELD map_fd
+
+static int map_freeze(const union bpf_attr *attr)
+{
+ int err = 0, ufd = attr->map_fd;
+ struct bpf_map *map;
+ struct fd f;
+
+ if (CHECK_ATTR(BPF_MAP_FREEZE))
+ return -EINVAL;
+
+ f = fdget(ufd);
+ map = __bpf_map_get(f);
+ if (IS_ERR(map))
+ return PTR_ERR(map);
+
+ if (map->map_type == BPF_MAP_TYPE_STRUCT_OPS || !IS_ERR_OR_NULL(map->record)) {
+ fdput(f);
+ return -ENOTSUPP;
+ }
+
+ if (!(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
+ fdput(f);
+ return -EPERM;
+ }
+
+ mutex_lock(&map->freeze_mutex);
+ if (bpf_map_write_active(map)) {
+ err = -EBUSY;
+ goto err_put;
+ }
+ if (READ_ONCE(map->frozen)) {
+ err = -EBUSY;
+ goto err_put;
+ }
+
+ WRITE_ONCE(map->frozen, true);
+err_put:
+ mutex_unlock(&map->freeze_mutex);
+ fdput(f);
+ return err;
+}
+
+static const struct bpf_prog_ops * const bpf_prog_types[] = {
+#define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
+ [_id] = & _name ## _prog_ops,
+#define BPF_MAP_TYPE(_id, _ops)
+#define BPF_LINK_TYPE(_id, _name)
+#include <linux/bpf_types.h>
+#undef BPF_PROG_TYPE
+#undef BPF_MAP_TYPE
+#undef BPF_LINK_TYPE
+};
+
+static int find_prog_type(enum bpf_prog_type type, struct bpf_prog *prog)
+{
+ const struct bpf_prog_ops *ops;
+
+ if (type >= ARRAY_SIZE(bpf_prog_types))
+ return -EINVAL;
+ type = array_index_nospec(type, ARRAY_SIZE(bpf_prog_types));
+ ops = bpf_prog_types[type];
+ if (!ops)
+ return -EINVAL;
+
+ if (!bpf_prog_is_offloaded(prog->aux))
+ prog->aux->ops = ops;
+ else
+ prog->aux->ops = &bpf_offload_prog_ops;
+ prog->type = type;
+ return 0;
+}
+
+enum bpf_audit {
+ BPF_AUDIT_LOAD,
+ BPF_AUDIT_UNLOAD,
+ BPF_AUDIT_MAX,
+};
+
+static const char * const bpf_audit_str[BPF_AUDIT_MAX] = {
+ [BPF_AUDIT_LOAD] = "LOAD",
+ [BPF_AUDIT_UNLOAD] = "UNLOAD",
+};
+
+static void bpf_audit_prog(const struct bpf_prog *prog, unsigned int op)
+{
+ struct audit_context *ctx = NULL;
+ struct audit_buffer *ab;
+
+ if (WARN_ON_ONCE(op >= BPF_AUDIT_MAX))
+ return;
+ if (audit_enabled == AUDIT_OFF)
+ return;
+ if (!in_irq() && !irqs_disabled())
+ ctx = audit_context();
+ ab = audit_log_start(ctx, GFP_ATOMIC, AUDIT_BPF);
+ if (unlikely(!ab))
+ return;
+ audit_log_format(ab, "prog-id=%u op=%s",
+ prog->aux->id, bpf_audit_str[op]);
+ audit_log_end(ab);
+}
+
+static int bpf_prog_alloc_id(struct bpf_prog *prog)
+{
+ int id;
+
+ idr_preload(GFP_KERNEL);
+ spin_lock_bh(&prog_idr_lock);
+ id = idr_alloc_cyclic(&prog_idr, prog, 1, INT_MAX, GFP_ATOMIC);
+ if (id > 0)
+ prog->aux->id = id;
+ spin_unlock_bh(&prog_idr_lock);
+ idr_preload_end();
+
+ /* id is in [1, INT_MAX) */
+ if (WARN_ON_ONCE(!id))
+ return -ENOSPC;
+
+ return id > 0 ? 0 : id;
+}
+
+void bpf_prog_free_id(struct bpf_prog *prog)
+{
+ unsigned long flags;
+
+ /* cBPF to eBPF migrations are currently not in the idr store.
+ * Offloaded programs are removed from the store when their device
+ * disappears - even if someone grabs an fd to them they are unusable,
+ * simply waiting for refcnt to drop to be freed.
+ */
+ if (!prog->aux->id)
+ return;
+
+ spin_lock_irqsave(&prog_idr_lock, flags);
+ idr_remove(&prog_idr, prog->aux->id);
+ prog->aux->id = 0;
+ spin_unlock_irqrestore(&prog_idr_lock, flags);
+}
+
+static void __bpf_prog_put_rcu(struct rcu_head *rcu)
+{
+ struct bpf_prog_aux *aux = container_of(rcu, struct bpf_prog_aux, rcu);
+
+ kvfree(aux->func_info);
+ kfree(aux->func_info_aux);
+ free_uid(aux->user);
+ security_bpf_prog_free(aux);
+ bpf_prog_free(aux->prog);
+}
+
+static void __bpf_prog_put_noref(struct bpf_prog *prog, bool deferred)
+{
+ bpf_prog_kallsyms_del_all(prog);
+ btf_put(prog->aux->btf);
+ module_put(prog->aux->mod);
+ kvfree(prog->aux->jited_linfo);
+ kvfree(prog->aux->linfo);
+ kfree(prog->aux->kfunc_tab);
+ if (prog->aux->attach_btf)
+ btf_put(prog->aux->attach_btf);
+
+ if (deferred) {
+ if (prog->aux->sleepable)
+ call_rcu_tasks_trace(&prog->aux->rcu, __bpf_prog_put_rcu);
+ else
+ call_rcu(&prog->aux->rcu, __bpf_prog_put_rcu);
+ } else {
+ __bpf_prog_put_rcu(&prog->aux->rcu);
+ }
+}
+
+static void bpf_prog_put_deferred(struct work_struct *work)
+{
+ struct bpf_prog_aux *aux;
+ struct bpf_prog *prog;
+
+ aux = container_of(work, struct bpf_prog_aux, work);
+ prog = aux->prog;
+ perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_UNLOAD, 0);
+ bpf_audit_prog(prog, BPF_AUDIT_UNLOAD);
+ bpf_prog_free_id(prog);
+ __bpf_prog_put_noref(prog, true);
+}
+
+static void __bpf_prog_put(struct bpf_prog *prog)
+{
+ struct bpf_prog_aux *aux = prog->aux;
+
+ if (atomic64_dec_and_test(&aux->refcnt)) {
+ if (in_irq() || irqs_disabled()) {
+ INIT_WORK(&aux->work, bpf_prog_put_deferred);
+ schedule_work(&aux->work);
+ } else {
+ bpf_prog_put_deferred(&aux->work);
+ }
+ }
+}
+
+void bpf_prog_put(struct bpf_prog *prog)
+{
+ __bpf_prog_put(prog);
+}
+EXPORT_SYMBOL_GPL(bpf_prog_put);
+
+static int bpf_prog_release(struct inode *inode, struct file *filp)
+{
+ struct bpf_prog *prog = filp->private_data;
+
+ bpf_prog_put(prog);
+ return 0;
+}
+
+struct bpf_prog_kstats {
+ u64 nsecs;
+ u64 cnt;
+ u64 misses;
+};
+
+void notrace bpf_prog_inc_misses_counter(struct bpf_prog *prog)
+{
+ struct bpf_prog_stats *stats;
+ unsigned int flags;
+
+ stats = this_cpu_ptr(prog->stats);
+ flags = u64_stats_update_begin_irqsave(&stats->syncp);
+ u64_stats_inc(&stats->misses);
+ u64_stats_update_end_irqrestore(&stats->syncp, flags);
+}
+
+static void bpf_prog_get_stats(const struct bpf_prog *prog,
+ struct bpf_prog_kstats *stats)
+{
+ u64 nsecs = 0, cnt = 0, misses = 0;
+ int cpu;
+
+ for_each_possible_cpu(cpu) {
+ const struct bpf_prog_stats *st;
+ unsigned int start;
+ u64 tnsecs, tcnt, tmisses;
+
+ st = per_cpu_ptr(prog->stats, cpu);
+ do {
+ start = u64_stats_fetch_begin(&st->syncp);
+ tnsecs = u64_stats_read(&st->nsecs);
+ tcnt = u64_stats_read(&st->cnt);
+ tmisses = u64_stats_read(&st->misses);
+ } while (u64_stats_fetch_retry(&st->syncp, start));
+ nsecs += tnsecs;
+ cnt += tcnt;
+ misses += tmisses;
+ }
+ stats->nsecs = nsecs;
+ stats->cnt = cnt;
+ stats->misses = misses;
+}
+
+#ifdef CONFIG_PROC_FS
+static void bpf_prog_show_fdinfo(struct seq_file *m, struct file *filp)
+{
+ const struct bpf_prog *prog = filp->private_data;
+ char prog_tag[sizeof(prog->tag) * 2 + 1] = { };
+ struct bpf_prog_kstats stats;
+
+ bpf_prog_get_stats(prog, &stats);
+ bin2hex(prog_tag, prog->tag, sizeof(prog->tag));
+ seq_printf(m,
+ "prog_type:\t%u\n"
+ "prog_jited:\t%u\n"
+ "prog_tag:\t%s\n"
+ "memlock:\t%llu\n"
+ "prog_id:\t%u\n"
+ "run_time_ns:\t%llu\n"
+ "run_cnt:\t%llu\n"
+ "recursion_misses:\t%llu\n"
+ "verified_insns:\t%u\n",
+ prog->type,
+ prog->jited,
+ prog_tag,
+ prog->pages * 1ULL << PAGE_SHIFT,
+ prog->aux->id,
+ stats.nsecs,
+ stats.cnt,
+ stats.misses,
+ prog->aux->verified_insns);
+}
+#endif
+
+const struct file_operations bpf_prog_fops = {
+#ifdef CONFIG_PROC_FS
+ .show_fdinfo = bpf_prog_show_fdinfo,
+#endif
+ .release = bpf_prog_release,
+ .read = bpf_dummy_read,
+ .write = bpf_dummy_write,
+};
+
+int bpf_prog_new_fd(struct bpf_prog *prog)
+{
+ int ret;
+
+ ret = security_bpf_prog(prog);
+ if (ret < 0)
+ return ret;
+
+ return anon_inode_getfd("bpf-prog", &bpf_prog_fops, prog,
+ O_RDWR | O_CLOEXEC);
+}
+
+static struct bpf_prog *____bpf_prog_get(struct fd f)
+{
+ if (!f.file)
+ return ERR_PTR(-EBADF);
+ if (f.file->f_op != &bpf_prog_fops) {
+ fdput(f);
+ return ERR_PTR(-EINVAL);
+ }
+
+ return f.file->private_data;
+}
+
+void bpf_prog_add(struct bpf_prog *prog, int i)
+{
+ atomic64_add(i, &prog->aux->refcnt);
+}
+EXPORT_SYMBOL_GPL(bpf_prog_add);
+
+void bpf_prog_sub(struct bpf_prog *prog, int i)
+{
+ /* Only to be used for undoing previous bpf_prog_add() in some
+ * error path. We still know that another entity in our call
+ * path holds a reference to the program, thus atomic_sub() can
+ * be safely used in such cases!
+ */
+ WARN_ON(atomic64_sub_return(i, &prog->aux->refcnt) == 0);
+}
+EXPORT_SYMBOL_GPL(bpf_prog_sub);
+
+void bpf_prog_inc(struct bpf_prog *prog)
+{
+ atomic64_inc(&prog->aux->refcnt);
+}
+EXPORT_SYMBOL_GPL(bpf_prog_inc);
+
+/* prog_idr_lock should have been held */
+struct bpf_prog *bpf_prog_inc_not_zero(struct bpf_prog *prog)
+{
+ int refold;
+
+ refold = atomic64_fetch_add_unless(&prog->aux->refcnt, 1, 0);
+
+ if (!refold)
+ return ERR_PTR(-ENOENT);
+
+ return prog;
+}
+EXPORT_SYMBOL_GPL(bpf_prog_inc_not_zero);
+
+bool bpf_prog_get_ok(struct bpf_prog *prog,
+ enum bpf_prog_type *attach_type, bool attach_drv)
+{
+ /* not an attachment, just a refcount inc, always allow */
+ if (!attach_type)
+ return true;
+
+ if (prog->type != *attach_type)
+ return false;
+ if (bpf_prog_is_offloaded(prog->aux) && !attach_drv)
+ return false;
+
+ return true;
+}
+
+static struct bpf_prog *__bpf_prog_get(u32 ufd, enum bpf_prog_type *attach_type,
+ bool attach_drv)
+{
+ struct fd f = fdget(ufd);
+ struct bpf_prog *prog;
+
+ prog = ____bpf_prog_get(f);
+ if (IS_ERR(prog))
+ return prog;
+ if (!bpf_prog_get_ok(prog, attach_type, attach_drv)) {
+ prog = ERR_PTR(-EINVAL);
+ goto out;
+ }
+
+ bpf_prog_inc(prog);
+out:
+ fdput(f);
+ return prog;
+}
+
+struct bpf_prog *bpf_prog_get(u32 ufd)
+{
+ return __bpf_prog_get(ufd, NULL, false);
+}
+
+struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
+ bool attach_drv)
+{
+ return __bpf_prog_get(ufd, &type, attach_drv);
+}
+EXPORT_SYMBOL_GPL(bpf_prog_get_type_dev);
+
+/* Initially all BPF programs could be loaded w/o specifying
+ * expected_attach_type. Later for some of them specifying expected_attach_type
+ * at load time became required so that program could be validated properly.
+ * Programs of types that are allowed to be loaded both w/ and w/o (for
+ * backward compatibility) expected_attach_type, should have the default attach
+ * type assigned to expected_attach_type for the latter case, so that it can be
+ * validated later at attach time.
+ *
+ * bpf_prog_load_fixup_attach_type() sets expected_attach_type in @attr if
+ * prog type requires it but has some attach types that have to be backward
+ * compatible.
+ */
+static void bpf_prog_load_fixup_attach_type(union bpf_attr *attr)
+{
+ switch (attr->prog_type) {
+ case BPF_PROG_TYPE_CGROUP_SOCK:
+ /* Unfortunately BPF_ATTACH_TYPE_UNSPEC enumeration doesn't
+ * exist so checking for non-zero is the way to go here.
+ */
+ if (!attr->expected_attach_type)
+ attr->expected_attach_type =
+ BPF_CGROUP_INET_SOCK_CREATE;
+ break;
+ case BPF_PROG_TYPE_SK_REUSEPORT:
+ if (!attr->expected_attach_type)
+ attr->expected_attach_type =
+ BPF_SK_REUSEPORT_SELECT;
+ break;
+ }
+}
+
+static int
+bpf_prog_load_check_attach(enum bpf_prog_type prog_type,
+ enum bpf_attach_type expected_attach_type,
+ struct btf *attach_btf, u32 btf_id,
+ struct bpf_prog *dst_prog)
+{
+ if (btf_id) {
+ if (btf_id > BTF_MAX_TYPE)
+ return -EINVAL;
+
+ if (!attach_btf && !dst_prog)
+ return -EINVAL;
+
+ switch (prog_type) {
+ case BPF_PROG_TYPE_TRACING:
+ case BPF_PROG_TYPE_LSM:
+ case BPF_PROG_TYPE_STRUCT_OPS:
+ case BPF_PROG_TYPE_EXT:
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+
+ if (attach_btf && (!btf_id || dst_prog))
+ return -EINVAL;
+
+ if (dst_prog && prog_type != BPF_PROG_TYPE_TRACING &&
+ prog_type != BPF_PROG_TYPE_EXT)
+ return -EINVAL;
+
+ switch (prog_type) {
+ case BPF_PROG_TYPE_CGROUP_SOCK:
+ switch (expected_attach_type) {
+ case BPF_CGROUP_INET_SOCK_CREATE:
+ case BPF_CGROUP_INET_SOCK_RELEASE:
+ case BPF_CGROUP_INET4_POST_BIND:
+ case BPF_CGROUP_INET6_POST_BIND:
+ return 0;
+ default:
+ return -EINVAL;
+ }
+ case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
+ switch (expected_attach_type) {
+ case BPF_CGROUP_INET4_BIND:
+ case BPF_CGROUP_INET6_BIND:
+ case BPF_CGROUP_INET4_CONNECT:
+ case BPF_CGROUP_INET6_CONNECT:
+ case BPF_CGROUP_INET4_GETPEERNAME:
+ case BPF_CGROUP_INET6_GETPEERNAME:
+ case BPF_CGROUP_INET4_GETSOCKNAME:
+ case BPF_CGROUP_INET6_GETSOCKNAME:
+ case BPF_CGROUP_UDP4_SENDMSG:
+ case BPF_CGROUP_UDP6_SENDMSG:
+ case BPF_CGROUP_UDP4_RECVMSG:
+ case BPF_CGROUP_UDP6_RECVMSG:
+ return 0;
+ default:
+ return -EINVAL;
+ }
+ case BPF_PROG_TYPE_CGROUP_SKB:
+ switch (expected_attach_type) {
+ case BPF_CGROUP_INET_INGRESS:
+ case BPF_CGROUP_INET_EGRESS:
+ return 0;
+ default:
+ return -EINVAL;
+ }
+ case BPF_PROG_TYPE_CGROUP_SOCKOPT:
+ switch (expected_attach_type) {
+ case BPF_CGROUP_SETSOCKOPT:
+ case BPF_CGROUP_GETSOCKOPT:
+ return 0;
+ default:
+ return -EINVAL;
+ }
+ case BPF_PROG_TYPE_SK_LOOKUP:
+ if (expected_attach_type == BPF_SK_LOOKUP)
+ return 0;
+ return -EINVAL;
+ case BPF_PROG_TYPE_SK_REUSEPORT:
+ switch (expected_attach_type) {
+ case BPF_SK_REUSEPORT_SELECT:
+ case BPF_SK_REUSEPORT_SELECT_OR_MIGRATE:
+ return 0;
+ default:
+ return -EINVAL;
+ }
+ case BPF_PROG_TYPE_NETFILTER:
+ if (expected_attach_type == BPF_NETFILTER)
+ return 0;
+ return -EINVAL;
+ case BPF_PROG_TYPE_SYSCALL:
+ case BPF_PROG_TYPE_EXT:
+ if (expected_attach_type)
+ return -EINVAL;
+ fallthrough;
+ default:
+ return 0;
+ }
+}
+
+static bool is_net_admin_prog_type(enum bpf_prog_type prog_type)
+{
+ switch (prog_type) {
+ case BPF_PROG_TYPE_SCHED_CLS:
+ case BPF_PROG_TYPE_SCHED_ACT:
+ case BPF_PROG_TYPE_XDP:
+ case BPF_PROG_TYPE_LWT_IN:
+ case BPF_PROG_TYPE_LWT_OUT:
+ case BPF_PROG_TYPE_LWT_XMIT:
+ case BPF_PROG_TYPE_LWT_SEG6LOCAL:
+ case BPF_PROG_TYPE_SK_SKB:
+ case BPF_PROG_TYPE_SK_MSG:
+ case BPF_PROG_TYPE_FLOW_DISSECTOR:
+ case BPF_PROG_TYPE_CGROUP_DEVICE:
+ case BPF_PROG_TYPE_CGROUP_SOCK:
+ case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
+ case BPF_PROG_TYPE_CGROUP_SOCKOPT:
+ case BPF_PROG_TYPE_CGROUP_SYSCTL:
+ case BPF_PROG_TYPE_SOCK_OPS:
+ case BPF_PROG_TYPE_EXT: /* extends any prog */
+ case BPF_PROG_TYPE_NETFILTER:
+ return true;
+ case BPF_PROG_TYPE_CGROUP_SKB:
+ /* always unpriv */
+ case BPF_PROG_TYPE_SK_REUSEPORT:
+ /* equivalent to SOCKET_FILTER. need CAP_BPF only */
+ default:
+ return false;
+ }
+}
+
+static bool is_perfmon_prog_type(enum bpf_prog_type prog_type)
+{
+ switch (prog_type) {
+ case BPF_PROG_TYPE_KPROBE:
+ case BPF_PROG_TYPE_TRACEPOINT:
+ case BPF_PROG_TYPE_PERF_EVENT:
+ case BPF_PROG_TYPE_RAW_TRACEPOINT:
+ case BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:
+ case BPF_PROG_TYPE_TRACING:
+ case BPF_PROG_TYPE_LSM:
+ case BPF_PROG_TYPE_STRUCT_OPS: /* has access to struct sock */
+ case BPF_PROG_TYPE_EXT: /* extends any prog */
+ return true;
+ default:
+ return false;
+ }
+}
+
+/* last field in 'union bpf_attr' used by this command */
+#define BPF_PROG_LOAD_LAST_FIELD log_true_size
+
+static int bpf_prog_load(union bpf_attr *attr, bpfptr_t uattr, u32 uattr_size)
+{
+ enum bpf_prog_type type = attr->prog_type;
+ struct bpf_prog *prog, *dst_prog = NULL;
+ struct btf *attach_btf = NULL;
+ int err;
+ char license[128];
+
+ if (CHECK_ATTR(BPF_PROG_LOAD))
+ return -EINVAL;
+
+ if (attr->prog_flags & ~(BPF_F_STRICT_ALIGNMENT |
+ BPF_F_ANY_ALIGNMENT |
+ BPF_F_TEST_STATE_FREQ |
+ BPF_F_SLEEPABLE |
+ BPF_F_TEST_RND_HI32 |
+ BPF_F_XDP_HAS_FRAGS |
+ BPF_F_XDP_DEV_BOUND_ONLY))
+ return -EINVAL;
+
+ if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
+ (attr->prog_flags & BPF_F_ANY_ALIGNMENT) &&
+ !bpf_capable())
+ return -EPERM;
+
+ /* Intent here is for unprivileged_bpf_disabled to block BPF program
+ * creation for unprivileged users; other actions depend
+ * on fd availability and access to bpffs, so are dependent on
+ * object creation success. Even with unprivileged BPF disabled,
+ * capability checks are still carried out for these
+ * and other operations.
+ */
+ if (sysctl_unprivileged_bpf_disabled && !bpf_capable())
+ return -EPERM;
+
+ if (attr->insn_cnt == 0 ||
+ attr->insn_cnt > (bpf_capable() ? BPF_COMPLEXITY_LIMIT_INSNS : BPF_MAXINSNS))
+ return -E2BIG;
+ if (type != BPF_PROG_TYPE_SOCKET_FILTER &&
+ type != BPF_PROG_TYPE_CGROUP_SKB &&
+ !bpf_capable())
+ return -EPERM;
+
+ if (is_net_admin_prog_type(type) && !capable(CAP_NET_ADMIN) && !capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ if (is_perfmon_prog_type(type) && !perfmon_capable())
+ return -EPERM;
+
+ /* attach_prog_fd/attach_btf_obj_fd can specify fd of either bpf_prog
+ * or btf, we need to check which one it is
+ */
+ if (attr->attach_prog_fd) {
+ dst_prog = bpf_prog_get(attr->attach_prog_fd);
+ if (IS_ERR(dst_prog)) {
+ dst_prog = NULL;
+ attach_btf = btf_get_by_fd(attr->attach_btf_obj_fd);
+ if (IS_ERR(attach_btf))
+ return -EINVAL;
+ if (!btf_is_kernel(attach_btf)) {
+ /* attaching through specifying bpf_prog's BTF
+ * objects directly might be supported eventually
+ */
+ btf_put(attach_btf);
+ return -ENOTSUPP;
+ }
+ }
+ } else if (attr->attach_btf_id) {
+ /* fall back to vmlinux BTF, if BTF type ID is specified */
+ attach_btf = bpf_get_btf_vmlinux();
+ if (IS_ERR(attach_btf))
+ return PTR_ERR(attach_btf);
+ if (!attach_btf)
+ return -EINVAL;
+ btf_get(attach_btf);
+ }
+
+ bpf_prog_load_fixup_attach_type(attr);
+ if (bpf_prog_load_check_attach(type, attr->expected_attach_type,
+ attach_btf, attr->attach_btf_id,
+ dst_prog)) {
+ if (dst_prog)
+ bpf_prog_put(dst_prog);
+ if (attach_btf)
+ btf_put(attach_btf);
+ return -EINVAL;
+ }
+
+ /* plain bpf_prog allocation */
+ prog = bpf_prog_alloc(bpf_prog_size(attr->insn_cnt), GFP_USER);
+ if (!prog) {
+ if (dst_prog)
+ bpf_prog_put(dst_prog);
+ if (attach_btf)
+ btf_put(attach_btf);
+ return -ENOMEM;
+ }
+
+ prog->expected_attach_type = attr->expected_attach_type;
+ prog->aux->attach_btf = attach_btf;
+ prog->aux->attach_btf_id = attr->attach_btf_id;
+ prog->aux->dst_prog = dst_prog;
+ prog->aux->dev_bound = !!attr->prog_ifindex;
+ prog->aux->sleepable = attr->prog_flags & BPF_F_SLEEPABLE;
+ prog->aux->xdp_has_frags = attr->prog_flags & BPF_F_XDP_HAS_FRAGS;
+
+ err = security_bpf_prog_alloc(prog->aux);
+ if (err)
+ goto free_prog;
+
+ prog->aux->user = get_current_user();
+ prog->len = attr->insn_cnt;
+
+ err = -EFAULT;
+ if (copy_from_bpfptr(prog->insns,
+ make_bpfptr(attr->insns, uattr.is_kernel),
+ bpf_prog_insn_size(prog)) != 0)
+ goto free_prog_sec;
+ /* copy eBPF program license from user space */
+ if (strncpy_from_bpfptr(license,
+ make_bpfptr(attr->license, uattr.is_kernel),
+ sizeof(license) - 1) < 0)
+ goto free_prog_sec;
+ license[sizeof(license) - 1] = 0;
+
+ /* eBPF programs must be GPL compatible to use GPL-ed functions */
+ prog->gpl_compatible = license_is_gpl_compatible(license) ? 1 : 0;
+
+ prog->orig_prog = NULL;
+ prog->jited = 0;
+
+ atomic64_set(&prog->aux->refcnt, 1);
+
+ if (bpf_prog_is_dev_bound(prog->aux)) {
+ err = bpf_prog_dev_bound_init(prog, attr);
+ if (err)
+ goto free_prog_sec;
+ }
+
+ if (type == BPF_PROG_TYPE_EXT && dst_prog &&
+ bpf_prog_is_dev_bound(dst_prog->aux)) {
+ err = bpf_prog_dev_bound_inherit(prog, dst_prog);
+ if (err)
+ goto free_prog_sec;
+ }
+
+ /* find program type: socket_filter vs tracing_filter */
+ err = find_prog_type(type, prog);
+ if (err < 0)
+ goto free_prog_sec;
+
+ prog->aux->load_time = ktime_get_boottime_ns();
+ err = bpf_obj_name_cpy(prog->aux->name, attr->prog_name,
+ sizeof(attr->prog_name));
+ if (err < 0)
+ goto free_prog_sec;
+
+ /* run eBPF verifier */
+ err = bpf_check(&prog, attr, uattr, uattr_size);
+ if (err < 0)
+ goto free_used_maps;
+
+ prog = bpf_prog_select_runtime(prog, &err);
+ if (err < 0)
+ goto free_used_maps;
+
+ err = bpf_prog_alloc_id(prog);
+ if (err)
+ goto free_used_maps;
+
+ /* Upon success of bpf_prog_alloc_id(), the BPF prog is
+ * effectively publicly exposed. However, retrieving via
+ * bpf_prog_get_fd_by_id() will take another reference,
+ * therefore it cannot be gone underneath us.
+ *
+ * Only for the time /after/ successful bpf_prog_new_fd()
+ * and before returning to userspace, we might just hold
+ * one reference and any parallel close on that fd could
+ * rip everything out. Hence, below notifications must
+ * happen before bpf_prog_new_fd().
+ *
+ * Also, any failure handling from this point onwards must
+ * be using bpf_prog_put() given the program is exposed.
+ */
+ bpf_prog_kallsyms_add(prog);
+ perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_LOAD, 0);
+ bpf_audit_prog(prog, BPF_AUDIT_LOAD);
+
+ err = bpf_prog_new_fd(prog);
+ if (err < 0)
+ bpf_prog_put(prog);
+ return err;
+
+free_used_maps:
+ /* In case we have subprogs, we need to wait for a grace
+ * period before we can tear down JIT memory since symbols
+ * are already exposed under kallsyms.
+ */
+ __bpf_prog_put_noref(prog, prog->aux->func_cnt);
+ return err;
+free_prog_sec:
+ free_uid(prog->aux->user);
+ security_bpf_prog_free(prog->aux);
+free_prog:
+ if (prog->aux->attach_btf)
+ btf_put(prog->aux->attach_btf);
+ bpf_prog_free(prog);
+ return err;
+}
+
+#define BPF_OBJ_LAST_FIELD path_fd
+
+static int bpf_obj_pin(const union bpf_attr *attr)
+{
+ int path_fd;
+
+ if (CHECK_ATTR(BPF_OBJ) || attr->file_flags & ~BPF_F_PATH_FD)
+ return -EINVAL;
+
+ /* path_fd has to be accompanied by BPF_F_PATH_FD flag */
+ if (!(attr->file_flags & BPF_F_PATH_FD) && attr->path_fd)
+ return -EINVAL;
+
+ path_fd = attr->file_flags & BPF_F_PATH_FD ? attr->path_fd : AT_FDCWD;
+ return bpf_obj_pin_user(attr->bpf_fd, path_fd,
+ u64_to_user_ptr(attr->pathname));
+}
+
+static int bpf_obj_get(const union bpf_attr *attr)
+{
+ int path_fd;
+
+ if (CHECK_ATTR(BPF_OBJ) || attr->bpf_fd != 0 ||
+ attr->file_flags & ~(BPF_OBJ_FLAG_MASK | BPF_F_PATH_FD))
+ return -EINVAL;
+
+ /* path_fd has to be accompanied by BPF_F_PATH_FD flag */
+ if (!(attr->file_flags & BPF_F_PATH_FD) && attr->path_fd)
+ return -EINVAL;
+
+ path_fd = attr->file_flags & BPF_F_PATH_FD ? attr->path_fd : AT_FDCWD;
+ return bpf_obj_get_user(path_fd, u64_to_user_ptr(attr->pathname),
+ attr->file_flags);
+}
+
+void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
+ const struct bpf_link_ops *ops, struct bpf_prog *prog)
+{
+ atomic64_set(&link->refcnt, 1);
+ link->type = type;
+ link->id = 0;
+ link->ops = ops;
+ link->prog = prog;
+}
+
+static void bpf_link_free_id(int id)
+{
+ if (!id)
+ return;
+
+ spin_lock_bh(&link_idr_lock);
+ idr_remove(&link_idr, id);
+ spin_unlock_bh(&link_idr_lock);
+}
+
+/* Clean up bpf_link and corresponding anon_inode file and FD. After
+ * anon_inode is created, bpf_link can't be just kfree()'d due to deferred
+ * anon_inode's release() call. This helper marks bpf_link as
+ * defunct, releases anon_inode file and puts reserved FD. bpf_prog's refcnt
+ * is not decremented, it's the responsibility of a calling code that failed
+ * to complete bpf_link initialization.
+ * This helper eventually calls link's dealloc callback, but does not call
+ * link's release callback.
+ */
+void bpf_link_cleanup(struct bpf_link_primer *primer)
+{
+ primer->link->prog = NULL;
+ bpf_link_free_id(primer->id);
+ fput(primer->file);
+ put_unused_fd(primer->fd);
+}
+
+void bpf_link_inc(struct bpf_link *link)
+{
+ atomic64_inc(&link->refcnt);
+}
+
+/* bpf_link_free is guaranteed to be called from process context */
+static void bpf_link_free(struct bpf_link *link)
+{
+ bpf_link_free_id(link->id);
+ if (link->prog) {
+ /* detach BPF program, clean up used resources */
+ link->ops->release(link);
+ bpf_prog_put(link->prog);
+ }
+ /* free bpf_link and its containing memory */
+ link->ops->dealloc(link);
+}
+
+static void bpf_link_put_deferred(struct work_struct *work)
+{
+ struct bpf_link *link = container_of(work, struct bpf_link, work);
+
+ bpf_link_free(link);
+}
+
+/* bpf_link_put might be called from atomic context. It needs to be called
+ * from sleepable context in order to acquire sleeping locks during the process.
+ */
+void bpf_link_put(struct bpf_link *link)
+{
+ if (!atomic64_dec_and_test(&link->refcnt))
+ return;
+
+ INIT_WORK(&link->work, bpf_link_put_deferred);
+ schedule_work(&link->work);
+}
+EXPORT_SYMBOL(bpf_link_put);
+
+static void bpf_link_put_direct(struct bpf_link *link)
+{
+ if (!atomic64_dec_and_test(&link->refcnt))
+ return;
+ bpf_link_free(link);
+}
+
+static int bpf_link_release(struct inode *inode, struct file *filp)
+{
+ struct bpf_link *link = filp->private_data;
+
+ bpf_link_put_direct(link);
+ return 0;
+}
+
+#ifdef CONFIG_PROC_FS
+#define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type)
+#define BPF_MAP_TYPE(_id, _ops)
+#define BPF_LINK_TYPE(_id, _name) [_id] = #_name,
+static const char *bpf_link_type_strs[] = {
+ [BPF_LINK_TYPE_UNSPEC] = "<invalid>",
+#include <linux/bpf_types.h>
+};
+#undef BPF_PROG_TYPE
+#undef BPF_MAP_TYPE
+#undef BPF_LINK_TYPE
+
+static void bpf_link_show_fdinfo(struct seq_file *m, struct file *filp)
+{
+ const struct bpf_link *link = filp->private_data;
+ const struct bpf_prog *prog = link->prog;
+ char prog_tag[sizeof(prog->tag) * 2 + 1] = { };
+
+ seq_printf(m,
+ "link_type:\t%s\n"
+ "link_id:\t%u\n",
+ bpf_link_type_strs[link->type],
+ link->id);
+ if (prog) {
+ bin2hex(prog_tag, prog->tag, sizeof(prog->tag));
+ seq_printf(m,
+ "prog_tag:\t%s\n"
+ "prog_id:\t%u\n",
+ prog_tag,
+ prog->aux->id);
+ }
+ if (link->ops->show_fdinfo)
+ link->ops->show_fdinfo(link, m);
+}
+#endif
+
+static const struct file_operations bpf_link_fops = {
+#ifdef CONFIG_PROC_FS
+ .show_fdinfo = bpf_link_show_fdinfo,
+#endif
+ .release = bpf_link_release,
+ .read = bpf_dummy_read,
+ .write = bpf_dummy_write,
+};
+
+static int bpf_link_alloc_id(struct bpf_link *link)
+{
+ int id;
+
+ idr_preload(GFP_KERNEL);
+ spin_lock_bh(&link_idr_lock);
+ id = idr_alloc_cyclic(&link_idr, link, 1, INT_MAX, GFP_ATOMIC);
+ spin_unlock_bh(&link_idr_lock);
+ idr_preload_end();
+
+ return id;
+}
+
+/* Prepare bpf_link to be exposed to user-space by allocating anon_inode file,
+ * reserving unused FD and allocating ID from link_idr. This is to be paired
+ * with bpf_link_settle() to install FD and ID and expose bpf_link to
+ * user-space, if bpf_link is successfully attached. If not, bpf_link and
+ * pre-allocated resources are to be freed with bpf_cleanup() call. All the
+ * transient state is passed around in struct bpf_link_primer.
+ * This is preferred way to create and initialize bpf_link, especially when
+ * there are complicated and expensive operations in between creating bpf_link
+ * itself and attaching it to BPF hook. By using bpf_link_prime() and
+ * bpf_link_settle() kernel code using bpf_link doesn't have to perform
+ * expensive (and potentially failing) roll back operations in a rare case
+ * that file, FD, or ID can't be allocated.
+ */
+int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer)
+{
+ struct file *file;
+ int fd, id;
+
+ fd = get_unused_fd_flags(O_CLOEXEC);
+ if (fd < 0)
+ return fd;
+
+
+ id = bpf_link_alloc_id(link);
+ if (id < 0) {
+ put_unused_fd(fd);
+ return id;
+ }
+
+ file = anon_inode_getfile("bpf_link", &bpf_link_fops, link, O_CLOEXEC);
+ if (IS_ERR(file)) {
+ bpf_link_free_id(id);
+ put_unused_fd(fd);
+ return PTR_ERR(file);
+ }
+
+ primer->link = link;
+ primer->file = file;
+ primer->fd = fd;
+ primer->id = id;
+ return 0;
+}
+
+int bpf_link_settle(struct bpf_link_primer *primer)
+{
+ /* make bpf_link fetchable by ID */
+ spin_lock_bh(&link_idr_lock);
+ primer->link->id = primer->id;
+ spin_unlock_bh(&link_idr_lock);
+ /* make bpf_link fetchable by FD */
+ fd_install(primer->fd, primer->file);
+ /* pass through installed FD */
+ return primer->fd;
+}
+
+int bpf_link_new_fd(struct bpf_link *link)
+{
+ return anon_inode_getfd("bpf-link", &bpf_link_fops, link, O_CLOEXEC);
+}
+
+struct bpf_link *bpf_link_get_from_fd(u32 ufd)
+{
+ struct fd f = fdget(ufd);
+ struct bpf_link *link;
+
+ if (!f.file)
+ return ERR_PTR(-EBADF);
+ if (f.file->f_op != &bpf_link_fops) {
+ fdput(f);
+ return ERR_PTR(-EINVAL);
+ }
+
+ link = f.file->private_data;
+ bpf_link_inc(link);
+ fdput(f);
+
+ return link;
+}
+EXPORT_SYMBOL(bpf_link_get_from_fd);
+
+static void bpf_tracing_link_release(struct bpf_link *link)
+{
+ struct bpf_tracing_link *tr_link =
+ container_of(link, struct bpf_tracing_link, link.link);
+
+ WARN_ON_ONCE(bpf_trampoline_unlink_prog(&tr_link->link,
+ tr_link->trampoline));
+
+ bpf_trampoline_put(tr_link->trampoline);
+
+ /* tgt_prog is NULL if target is a kernel function */
+ if (tr_link->tgt_prog)
+ bpf_prog_put(tr_link->tgt_prog);
+}
+
+static void bpf_tracing_link_dealloc(struct bpf_link *link)
+{
+ struct bpf_tracing_link *tr_link =
+ container_of(link, struct bpf_tracing_link, link.link);
+
+ kfree(tr_link);
+}
+
+static void bpf_tracing_link_show_fdinfo(const struct bpf_link *link,
+ struct seq_file *seq)
+{
+ struct bpf_tracing_link *tr_link =
+ container_of(link, struct bpf_tracing_link, link.link);
+ u32 target_btf_id, target_obj_id;
+
+ bpf_trampoline_unpack_key(tr_link->trampoline->key,
+ &target_obj_id, &target_btf_id);
+ seq_printf(seq,
+ "attach_type:\t%d\n"
+ "target_obj_id:\t%u\n"
+ "target_btf_id:\t%u\n",
+ tr_link->attach_type,
+ target_obj_id,
+ target_btf_id);
+}
+
+static int bpf_tracing_link_fill_link_info(const struct bpf_link *link,
+ struct bpf_link_info *info)
+{
+ struct bpf_tracing_link *tr_link =
+ container_of(link, struct bpf_tracing_link, link.link);
+
+ info->tracing.attach_type = tr_link->attach_type;
+ bpf_trampoline_unpack_key(tr_link->trampoline->key,
+ &info->tracing.target_obj_id,
+ &info->tracing.target_btf_id);
+
+ return 0;
+}
+
+static const struct bpf_link_ops bpf_tracing_link_lops = {
+ .release = bpf_tracing_link_release,
+ .dealloc = bpf_tracing_link_dealloc,
+ .show_fdinfo = bpf_tracing_link_show_fdinfo,
+ .fill_link_info = bpf_tracing_link_fill_link_info,
+};
+
+static int bpf_tracing_prog_attach(struct bpf_prog *prog,
+ int tgt_prog_fd,
+ u32 btf_id,
+ u64 bpf_cookie)
+{
+ struct bpf_link_primer link_primer;
+ struct bpf_prog *tgt_prog = NULL;
+ struct bpf_trampoline *tr = NULL;
+ struct bpf_tracing_link *link;
+ u64 key = 0;
+ int err;
+
+ switch (prog->type) {
+ case BPF_PROG_TYPE_TRACING:
+ if (prog->expected_attach_type != BPF_TRACE_FENTRY &&
+ prog->expected_attach_type != BPF_TRACE_FEXIT &&
+ prog->expected_attach_type != BPF_MODIFY_RETURN) {
+ err = -EINVAL;
+ goto out_put_prog;
+ }
+ break;
+ case BPF_PROG_TYPE_EXT:
+ if (prog->expected_attach_type != 0) {
+ err = -EINVAL;
+ goto out_put_prog;
+ }
+ break;
+ case BPF_PROG_TYPE_LSM:
+ if (prog->expected_attach_type != BPF_LSM_MAC) {
+ err = -EINVAL;
+ goto out_put_prog;
+ }
+ break;
+ default:
+ err = -EINVAL;
+ goto out_put_prog;
+ }
+
+ if (!!tgt_prog_fd != !!btf_id) {
+ err = -EINVAL;
+ goto out_put_prog;
+ }
+
+ if (tgt_prog_fd) {
+ /* For now we only allow new targets for BPF_PROG_TYPE_EXT */
+ if (prog->type != BPF_PROG_TYPE_EXT) {
+ err = -EINVAL;
+ goto out_put_prog;
+ }
+
+ tgt_prog = bpf_prog_get(tgt_prog_fd);
+ if (IS_ERR(tgt_prog)) {
+ err = PTR_ERR(tgt_prog);
+ tgt_prog = NULL;
+ goto out_put_prog;
+ }
+
+ key = bpf_trampoline_compute_key(tgt_prog, NULL, btf_id);
+ }
+
+ link = kzalloc(sizeof(*link), GFP_USER);
+ if (!link) {
+ err = -ENOMEM;
+ goto out_put_prog;
+ }
+ bpf_link_init(&link->link.link, BPF_LINK_TYPE_TRACING,
+ &bpf_tracing_link_lops, prog);
+ link->attach_type = prog->expected_attach_type;
+ link->link.cookie = bpf_cookie;
+
+ mutex_lock(&prog->aux->dst_mutex);
+
+ /* There are a few possible cases here:
+ *
+ * - if prog->aux->dst_trampoline is set, the program was just loaded
+ * and not yet attached to anything, so we can use the values stored
+ * in prog->aux
+ *
+ * - if prog->aux->dst_trampoline is NULL, the program has already been
+ * attached to a target and its initial target was cleared (below)
+ *
+ * - if tgt_prog != NULL, the caller specified tgt_prog_fd +
+ * target_btf_id using the link_create API.
+ *
+ * - if tgt_prog == NULL when this function was called using the old
+ * raw_tracepoint_open API, and we need a target from prog->aux
+ *
+ * - if prog->aux->dst_trampoline and tgt_prog is NULL, the program
+ * was detached and is going for re-attachment.
+ *
+ * - if prog->aux->dst_trampoline is NULL and tgt_prog and prog->aux->attach_btf
+ * are NULL, then program was already attached and user did not provide
+ * tgt_prog_fd so we have no way to find out or create trampoline
+ */
+ if (!prog->aux->dst_trampoline && !tgt_prog) {
+ /*
+ * Allow re-attach for TRACING and LSM programs. If it's
+ * currently linked, bpf_trampoline_link_prog will fail.
+ * EXT programs need to specify tgt_prog_fd, so they
+ * re-attach in separate code path.
+ */
+ if (prog->type != BPF_PROG_TYPE_TRACING &&
+ prog->type != BPF_PROG_TYPE_LSM) {
+ err = -EINVAL;
+ goto out_unlock;
+ }
+ /* We can allow re-attach only if we have valid attach_btf. */
+ if (!prog->aux->attach_btf) {
+ err = -EINVAL;
+ goto out_unlock;
+ }
+ btf_id = prog->aux->attach_btf_id;
+ key = bpf_trampoline_compute_key(NULL, prog->aux->attach_btf, btf_id);
+ }
+
+ if (!prog->aux->dst_trampoline ||
+ (key && key != prog->aux->dst_trampoline->key)) {
+ /* If there is no saved target, or the specified target is
+ * different from the destination specified at load time, we
+ * need a new trampoline and a check for compatibility
+ */
+ struct bpf_attach_target_info tgt_info = {};
+
+ err = bpf_check_attach_target(NULL, prog, tgt_prog, btf_id,
+ &tgt_info);
+ if (err)
+ goto out_unlock;
+
+ if (tgt_info.tgt_mod) {
+ module_put(prog->aux->mod);
+ prog->aux->mod = tgt_info.tgt_mod;
+ }
+
+ tr = bpf_trampoline_get(key, &tgt_info);
+ if (!tr) {
+ err = -ENOMEM;
+ goto out_unlock;
+ }
+ } else {
+ /* The caller didn't specify a target, or the target was the
+ * same as the destination supplied during program load. This
+ * means we can reuse the trampoline and reference from program
+ * load time, and there is no need to allocate a new one. This
+ * can only happen once for any program, as the saved values in
+ * prog->aux are cleared below.
+ */
+ tr = prog->aux->dst_trampoline;
+ tgt_prog = prog->aux->dst_prog;
+ }
+
+ err = bpf_link_prime(&link->link.link, &link_primer);
+ if (err)
+ goto out_unlock;
+
+ err = bpf_trampoline_link_prog(&link->link, tr);
+ if (err) {
+ bpf_link_cleanup(&link_primer);
+ link = NULL;
+ goto out_unlock;
+ }
+
+ link->tgt_prog = tgt_prog;
+ link->trampoline = tr;
+
+ /* Always clear the trampoline and target prog from prog->aux to make
+ * sure the original attach destination is not kept alive after a
+ * program is (re-)attached to another target.
+ */
+ if (prog->aux->dst_prog &&
+ (tgt_prog_fd || tr != prog->aux->dst_trampoline))
+ /* got extra prog ref from syscall, or attaching to different prog */
+ bpf_prog_put(prog->aux->dst_prog);
+ if (prog->aux->dst_trampoline && tr != prog->aux->dst_trampoline)
+ /* we allocated a new trampoline, so free the old one */
+ bpf_trampoline_put(prog->aux->dst_trampoline);
+
+ prog->aux->dst_prog = NULL;
+ prog->aux->dst_trampoline = NULL;
+ mutex_unlock(&prog->aux->dst_mutex);
+
+ return bpf_link_settle(&link_primer);
+out_unlock:
+ if (tr && tr != prog->aux->dst_trampoline)
+ bpf_trampoline_put(tr);
+ mutex_unlock(&prog->aux->dst_mutex);
+ kfree(link);
+out_put_prog:
+ if (tgt_prog_fd && tgt_prog)
+ bpf_prog_put(tgt_prog);
+ return err;
+}
+
+struct bpf_raw_tp_link {
+ struct bpf_link link;
+ struct bpf_raw_event_map *btp;
+};
+
+static void bpf_raw_tp_link_release(struct bpf_link *link)
+{
+ struct bpf_raw_tp_link *raw_tp =
+ container_of(link, struct bpf_raw_tp_link, link);
+
+ bpf_probe_unregister(raw_tp->btp, raw_tp->link.prog);
+ bpf_put_raw_tracepoint(raw_tp->btp);
+}
+
+static void bpf_raw_tp_link_dealloc(struct bpf_link *link)
+{
+ struct bpf_raw_tp_link *raw_tp =
+ container_of(link, struct bpf_raw_tp_link, link);
+
+ kfree(raw_tp);
+}
+
+static void bpf_raw_tp_link_show_fdinfo(const struct bpf_link *link,
+ struct seq_file *seq)
+{
+ struct bpf_raw_tp_link *raw_tp_link =
+ container_of(link, struct bpf_raw_tp_link, link);
+
+ seq_printf(seq,
+ "tp_name:\t%s\n",
+ raw_tp_link->btp->tp->name);
+}
+
+static int bpf_copy_to_user(char __user *ubuf, const char *buf, u32 ulen,
+ u32 len)
+{
+ if (ulen >= len + 1) {
+ if (copy_to_user(ubuf, buf, len + 1))
+ return -EFAULT;
+ } else {
+ char zero = '\0';
+
+ if (copy_to_user(ubuf, buf, ulen - 1))
+ return -EFAULT;
+ if (put_user(zero, ubuf + ulen - 1))
+ return -EFAULT;
+ return -ENOSPC;
+ }
+
+ return 0;
+}
+
+static int bpf_raw_tp_link_fill_link_info(const struct bpf_link *link,
+ struct bpf_link_info *info)
+{
+ struct bpf_raw_tp_link *raw_tp_link =
+ container_of(link, struct bpf_raw_tp_link, link);
+ char __user *ubuf = u64_to_user_ptr(info->raw_tracepoint.tp_name);
+ const char *tp_name = raw_tp_link->btp->tp->name;
+ u32 ulen = info->raw_tracepoint.tp_name_len;
+ size_t tp_len = strlen(tp_name);
+
+ if (!ulen ^ !ubuf)
+ return -EINVAL;
+
+ info->raw_tracepoint.tp_name_len = tp_len + 1;
+
+ if (!ubuf)
+ return 0;
+
+ return bpf_copy_to_user(ubuf, tp_name, ulen, tp_len);
+}
+
+static const struct bpf_link_ops bpf_raw_tp_link_lops = {
+ .release = bpf_raw_tp_link_release,
+ .dealloc = bpf_raw_tp_link_dealloc,
+ .show_fdinfo = bpf_raw_tp_link_show_fdinfo,
+ .fill_link_info = bpf_raw_tp_link_fill_link_info,
+};
+
+#ifdef CONFIG_PERF_EVENTS
+struct bpf_perf_link {
+ struct bpf_link link;
+ struct file *perf_file;
+};
+
+static void bpf_perf_link_release(struct bpf_link *link)
+{
+ struct bpf_perf_link *perf_link = container_of(link, struct bpf_perf_link, link);
+ struct perf_event *event = perf_link->perf_file->private_data;
+
+ perf_event_free_bpf_prog(event);
+ fput(perf_link->perf_file);
+}
+
+static void bpf_perf_link_dealloc(struct bpf_link *link)
+{
+ struct bpf_perf_link *perf_link = container_of(link, struct bpf_perf_link, link);
+
+ kfree(perf_link);
+}
+
+static int bpf_perf_link_fill_common(const struct perf_event *event,
+ char __user *uname, u32 ulen,
+ u64 *probe_offset, u64 *probe_addr,
+ u32 *fd_type)
+{
+ const char *buf;
+ u32 prog_id;
+ size_t len;
+ int err;
+
+ if (!ulen ^ !uname)
+ return -EINVAL;
+
+ err = bpf_get_perf_event_info(event, &prog_id, fd_type, &buf,
+ probe_offset, probe_addr);
+ if (err)
+ return err;
+ if (!uname)
+ return 0;
+ if (buf) {
+ len = strlen(buf);
+ err = bpf_copy_to_user(uname, buf, ulen, len);
+ if (err)
+ return err;
+ } else {
+ char zero = '\0';
+
+ if (put_user(zero, uname))
+ return -EFAULT;
+ }
+ return 0;
+}
+
+#ifdef CONFIG_KPROBE_EVENTS
+static int bpf_perf_link_fill_kprobe(const struct perf_event *event,
+ struct bpf_link_info *info)
+{
+ char __user *uname;
+ u64 addr, offset;
+ u32 ulen, type;
+ int err;
+
+ uname = u64_to_user_ptr(info->perf_event.kprobe.func_name);
+ ulen = info->perf_event.kprobe.name_len;
+ err = bpf_perf_link_fill_common(event, uname, ulen, &offset, &addr,
+ &type);
+ if (err)
+ return err;
+ if (type == BPF_FD_TYPE_KRETPROBE)
+ info->perf_event.type = BPF_PERF_EVENT_KRETPROBE;
+ else
+ info->perf_event.type = BPF_PERF_EVENT_KPROBE;
+
+ info->perf_event.kprobe.offset = offset;
+ if (!kallsyms_show_value(current_cred()))
+ addr = 0;
+ info->perf_event.kprobe.addr = addr;
+ return 0;
+}
+#endif
+
+#ifdef CONFIG_UPROBE_EVENTS
+static int bpf_perf_link_fill_uprobe(const struct perf_event *event,
+ struct bpf_link_info *info)
+{
+ char __user *uname;
+ u64 addr, offset;
+ u32 ulen, type;
+ int err;
+
+ uname = u64_to_user_ptr(info->perf_event.uprobe.file_name);
+ ulen = info->perf_event.uprobe.name_len;
+ err = bpf_perf_link_fill_common(event, uname, ulen, &offset, &addr,
+ &type);
+ if (err)
+ return err;
+
+ if (type == BPF_FD_TYPE_URETPROBE)
+ info->perf_event.type = BPF_PERF_EVENT_URETPROBE;
+ else
+ info->perf_event.type = BPF_PERF_EVENT_UPROBE;
+ info->perf_event.uprobe.offset = offset;
+ return 0;
+}
+#endif
+
+static int bpf_perf_link_fill_probe(const struct perf_event *event,
+ struct bpf_link_info *info)
+{
+#ifdef CONFIG_KPROBE_EVENTS
+ if (event->tp_event->flags & TRACE_EVENT_FL_KPROBE)
+ return bpf_perf_link_fill_kprobe(event, info);
+#endif
+#ifdef CONFIG_UPROBE_EVENTS
+ if (event->tp_event->flags & TRACE_EVENT_FL_UPROBE)
+ return bpf_perf_link_fill_uprobe(event, info);
+#endif
+ return -EOPNOTSUPP;
+}
+
+static int bpf_perf_link_fill_tracepoint(const struct perf_event *event,
+ struct bpf_link_info *info)
+{
+ char __user *uname;
+ u32 ulen;
+
+ uname = u64_to_user_ptr(info->perf_event.tracepoint.tp_name);
+ ulen = info->perf_event.tracepoint.name_len;
+ info->perf_event.type = BPF_PERF_EVENT_TRACEPOINT;
+ return bpf_perf_link_fill_common(event, uname, ulen, NULL, NULL, NULL);
+}
+
+static int bpf_perf_link_fill_perf_event(const struct perf_event *event,
+ struct bpf_link_info *info)
+{
+ info->perf_event.event.type = event->attr.type;
+ info->perf_event.event.config = event->attr.config;
+ info->perf_event.type = BPF_PERF_EVENT_EVENT;
+ return 0;
+}
+
+static int bpf_perf_link_fill_link_info(const struct bpf_link *link,
+ struct bpf_link_info *info)
+{
+ struct bpf_perf_link *perf_link;
+ const struct perf_event *event;
+
+ perf_link = container_of(link, struct bpf_perf_link, link);
+ event = perf_get_event(perf_link->perf_file);
+ if (IS_ERR(event))
+ return PTR_ERR(event);
+
+ switch (event->prog->type) {
+ case BPF_PROG_TYPE_PERF_EVENT:
+ return bpf_perf_link_fill_perf_event(event, info);
+ case BPF_PROG_TYPE_TRACEPOINT:
+ return bpf_perf_link_fill_tracepoint(event, info);
+ case BPF_PROG_TYPE_KPROBE:
+ return bpf_perf_link_fill_probe(event, info);
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static const struct bpf_link_ops bpf_perf_link_lops = {
+ .release = bpf_perf_link_release,
+ .dealloc = bpf_perf_link_dealloc,
+ .fill_link_info = bpf_perf_link_fill_link_info,
+};
+
+static int bpf_perf_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)
+{
+ struct bpf_link_primer link_primer;
+ struct bpf_perf_link *link;
+ struct perf_event *event;
+ struct file *perf_file;
+ int err;
+
+ if (attr->link_create.flags)
+ return -EINVAL;
+
+ perf_file = perf_event_get(attr->link_create.target_fd);
+ if (IS_ERR(perf_file))
+ return PTR_ERR(perf_file);
+
+ link = kzalloc(sizeof(*link), GFP_USER);
+ if (!link) {
+ err = -ENOMEM;
+ goto out_put_file;
+ }
+ bpf_link_init(&link->link, BPF_LINK_TYPE_PERF_EVENT, &bpf_perf_link_lops, prog);
+ link->perf_file = perf_file;
+
+ err = bpf_link_prime(&link->link, &link_primer);
+ if (err) {
+ kfree(link);
+ goto out_put_file;
+ }
+
+ event = perf_file->private_data;
+ err = perf_event_set_bpf_prog(event, prog, attr->link_create.perf_event.bpf_cookie);
+ if (err) {
+ bpf_link_cleanup(&link_primer);
+ goto out_put_file;
+ }
+ /* perf_event_set_bpf_prog() doesn't take its own refcnt on prog */
+ bpf_prog_inc(prog);
+
+ return bpf_link_settle(&link_primer);
+
+out_put_file:
+ fput(perf_file);
+ return err;
+}
+#else
+static int bpf_perf_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)
+{
+ return -EOPNOTSUPP;
+}
+#endif /* CONFIG_PERF_EVENTS */
+
+static int bpf_raw_tp_link_attach(struct bpf_prog *prog,
+ const char __user *user_tp_name)
+{
+ struct bpf_link_primer link_primer;
+ struct bpf_raw_tp_link *link;
+ struct bpf_raw_event_map *btp;
+ const char *tp_name;
+ char buf[128];
+ int err;
+
+ switch (prog->type) {
+ case BPF_PROG_TYPE_TRACING:
+ case BPF_PROG_TYPE_EXT:
+ case BPF_PROG_TYPE_LSM:
+ if (user_tp_name)
+ /* The attach point for this category of programs
+ * should be specified via btf_id during program load.
+ */
+ return -EINVAL;
+ if (prog->type == BPF_PROG_TYPE_TRACING &&
+ prog->expected_attach_type == BPF_TRACE_RAW_TP) {
+ tp_name = prog->aux->attach_func_name;
+ break;
+ }
+ return bpf_tracing_prog_attach(prog, 0, 0, 0);
+ case BPF_PROG_TYPE_RAW_TRACEPOINT:
+ case BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:
+ if (strncpy_from_user(buf, user_tp_name, sizeof(buf) - 1) < 0)
+ return -EFAULT;
+ buf[sizeof(buf) - 1] = 0;
+ tp_name = buf;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ btp = bpf_get_raw_tracepoint(tp_name);
+ if (!btp)
+ return -ENOENT;
+
+ link = kzalloc(sizeof(*link), GFP_USER);
+ if (!link) {
+ err = -ENOMEM;
+ goto out_put_btp;
+ }
+ bpf_link_init(&link->link, BPF_LINK_TYPE_RAW_TRACEPOINT,
+ &bpf_raw_tp_link_lops, prog);
+ link->btp = btp;
+
+ err = bpf_link_prime(&link->link, &link_primer);
+ if (err) {
+ kfree(link);
+ goto out_put_btp;
+ }
+
+ err = bpf_probe_register(link->btp, prog);
+ if (err) {
+ bpf_link_cleanup(&link_primer);
+ goto out_put_btp;
+ }
+
+ return bpf_link_settle(&link_primer);
+
+out_put_btp:
+ bpf_put_raw_tracepoint(btp);
+ return err;
+}
+
+#define BPF_RAW_TRACEPOINT_OPEN_LAST_FIELD raw_tracepoint.prog_fd
+
+static int bpf_raw_tracepoint_open(const union bpf_attr *attr)
+{
+ struct bpf_prog *prog;
+ int fd;
+
+ if (CHECK_ATTR(BPF_RAW_TRACEPOINT_OPEN))
+ return -EINVAL;
+
+ prog = bpf_prog_get(attr->raw_tracepoint.prog_fd);
+ if (IS_ERR(prog))
+ return PTR_ERR(prog);
+
+ fd = bpf_raw_tp_link_attach(prog, u64_to_user_ptr(attr->raw_tracepoint.name));
+ if (fd < 0)
+ bpf_prog_put(prog);
+ return fd;
+}
+
+static enum bpf_prog_type
+attach_type_to_prog_type(enum bpf_attach_type attach_type)
+{
+ switch (attach_type) {
+ case BPF_CGROUP_INET_INGRESS:
+ case BPF_CGROUP_INET_EGRESS:
+ return BPF_PROG_TYPE_CGROUP_SKB;
+ case BPF_CGROUP_INET_SOCK_CREATE:
+ case BPF_CGROUP_INET_SOCK_RELEASE:
+ case BPF_CGROUP_INET4_POST_BIND:
+ case BPF_CGROUP_INET6_POST_BIND:
+ return BPF_PROG_TYPE_CGROUP_SOCK;
+ case BPF_CGROUP_INET4_BIND:
+ case BPF_CGROUP_INET6_BIND:
+ case BPF_CGROUP_INET4_CONNECT:
+ case BPF_CGROUP_INET6_CONNECT:
+ case BPF_CGROUP_INET4_GETPEERNAME:
+ case BPF_CGROUP_INET6_GETPEERNAME:
+ case BPF_CGROUP_INET4_GETSOCKNAME:
+ case BPF_CGROUP_INET6_GETSOCKNAME:
+ case BPF_CGROUP_UDP4_SENDMSG:
+ case BPF_CGROUP_UDP6_SENDMSG:
+ case BPF_CGROUP_UDP4_RECVMSG:
+ case BPF_CGROUP_UDP6_RECVMSG:
+ return BPF_PROG_TYPE_CGROUP_SOCK_ADDR;
+ case BPF_CGROUP_SOCK_OPS:
+ return BPF_PROG_TYPE_SOCK_OPS;
+ case BPF_CGROUP_DEVICE:
+ return BPF_PROG_TYPE_CGROUP_DEVICE;
+ case BPF_SK_MSG_VERDICT:
+ return BPF_PROG_TYPE_SK_MSG;
+ case BPF_SK_SKB_STREAM_PARSER:
+ case BPF_SK_SKB_STREAM_VERDICT:
+ case BPF_SK_SKB_VERDICT:
+ return BPF_PROG_TYPE_SK_SKB;
+ case BPF_LIRC_MODE2:
+ return BPF_PROG_TYPE_LIRC_MODE2;
+ case BPF_FLOW_DISSECTOR:
+ return BPF_PROG_TYPE_FLOW_DISSECTOR;
+ case BPF_CGROUP_SYSCTL:
+ return BPF_PROG_TYPE_CGROUP_SYSCTL;
+ case BPF_CGROUP_GETSOCKOPT:
+ case BPF_CGROUP_SETSOCKOPT:
+ return BPF_PROG_TYPE_CGROUP_SOCKOPT;
+ case BPF_TRACE_ITER:
+ case BPF_TRACE_RAW_TP:
+ case BPF_TRACE_FENTRY:
+ case BPF_TRACE_FEXIT:
+ case BPF_MODIFY_RETURN:
+ return BPF_PROG_TYPE_TRACING;
+ case BPF_LSM_MAC:
+ return BPF_PROG_TYPE_LSM;
+ case BPF_SK_LOOKUP:
+ return BPF_PROG_TYPE_SK_LOOKUP;
+ case BPF_XDP:
+ return BPF_PROG_TYPE_XDP;
+ case BPF_LSM_CGROUP:
+ return BPF_PROG_TYPE_LSM;
+ case BPF_TCX_INGRESS:
+ case BPF_TCX_EGRESS:
+ return BPF_PROG_TYPE_SCHED_CLS;
+ default:
+ return BPF_PROG_TYPE_UNSPEC;
+ }
+}
+
+static int bpf_prog_attach_check_attach_type(const struct bpf_prog *prog,
+ enum bpf_attach_type attach_type)
+{
+ enum bpf_prog_type ptype;
+
+ switch (prog->type) {
+ case BPF_PROG_TYPE_CGROUP_SOCK:
+ case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
+ case BPF_PROG_TYPE_CGROUP_SOCKOPT:
+ case BPF_PROG_TYPE_SK_LOOKUP:
+ return attach_type == prog->expected_attach_type ? 0 : -EINVAL;
+ case BPF_PROG_TYPE_CGROUP_SKB:
+ if (!capable(CAP_NET_ADMIN))
+ /* cg-skb progs can be loaded by unpriv user.
+ * check permissions at attach time.
+ */
+ return -EPERM;
+ return prog->enforce_expected_attach_type &&
+ prog->expected_attach_type != attach_type ?
+ -EINVAL : 0;
+ case BPF_PROG_TYPE_EXT:
+ return 0;
+ case BPF_PROG_TYPE_NETFILTER:
+ if (attach_type != BPF_NETFILTER)
+ return -EINVAL;
+ return 0;
+ case BPF_PROG_TYPE_PERF_EVENT:
+ case BPF_PROG_TYPE_TRACEPOINT:
+ if (attach_type != BPF_PERF_EVENT)
+ return -EINVAL;
+ return 0;
+ case BPF_PROG_TYPE_KPROBE:
+ if (prog->expected_attach_type == BPF_TRACE_KPROBE_MULTI &&
+ attach_type != BPF_TRACE_KPROBE_MULTI)
+ return -EINVAL;
+ if (prog->expected_attach_type == BPF_TRACE_UPROBE_MULTI &&
+ attach_type != BPF_TRACE_UPROBE_MULTI)
+ return -EINVAL;
+ if (attach_type != BPF_PERF_EVENT &&
+ attach_type != BPF_TRACE_KPROBE_MULTI &&
+ attach_type != BPF_TRACE_UPROBE_MULTI)
+ return -EINVAL;
+ return 0;
+ case BPF_PROG_TYPE_SCHED_CLS:
+ if (attach_type != BPF_TCX_INGRESS &&
+ attach_type != BPF_TCX_EGRESS)
+ return -EINVAL;
+ return 0;
+ default:
+ ptype = attach_type_to_prog_type(attach_type);
+ if (ptype == BPF_PROG_TYPE_UNSPEC || ptype != prog->type)
+ return -EINVAL;
+ return 0;
+ }
+}
+
+#define BPF_PROG_ATTACH_LAST_FIELD expected_revision
+
+#define BPF_F_ATTACH_MASK_BASE \
+ (BPF_F_ALLOW_OVERRIDE | \
+ BPF_F_ALLOW_MULTI | \
+ BPF_F_REPLACE)
+
+#define BPF_F_ATTACH_MASK_MPROG \
+ (BPF_F_REPLACE | \
+ BPF_F_BEFORE | \
+ BPF_F_AFTER | \
+ BPF_F_ID | \
+ BPF_F_LINK)
+
+static int bpf_prog_attach(const union bpf_attr *attr)
+{
+ enum bpf_prog_type ptype;
+ struct bpf_prog *prog;
+ int ret;
+
+ if (CHECK_ATTR(BPF_PROG_ATTACH))
+ return -EINVAL;
+
+ ptype = attach_type_to_prog_type(attr->attach_type);
+ if (ptype == BPF_PROG_TYPE_UNSPEC)
+ return -EINVAL;
+ if (bpf_mprog_supported(ptype)) {
+ if (attr->attach_flags & ~BPF_F_ATTACH_MASK_MPROG)
+ return -EINVAL;
+ } else {
+ if (attr->attach_flags & ~BPF_F_ATTACH_MASK_BASE)
+ return -EINVAL;
+ if (attr->relative_fd ||
+ attr->expected_revision)
+ return -EINVAL;
+ }
+
+ prog = bpf_prog_get_type(attr->attach_bpf_fd, ptype);
+ if (IS_ERR(prog))
+ return PTR_ERR(prog);
+
+ if (bpf_prog_attach_check_attach_type(prog, attr->attach_type)) {
+ bpf_prog_put(prog);
+ return -EINVAL;
+ }
+
+ switch (ptype) {
+ case BPF_PROG_TYPE_SK_SKB:
+ case BPF_PROG_TYPE_SK_MSG:
+ ret = sock_map_get_from_fd(attr, prog);
+ break;
+ case BPF_PROG_TYPE_LIRC_MODE2:
+ ret = lirc_prog_attach(attr, prog);
+ break;
+ case BPF_PROG_TYPE_FLOW_DISSECTOR:
+ ret = netns_bpf_prog_attach(attr, prog);
+ break;
+ case BPF_PROG_TYPE_CGROUP_DEVICE:
+ case BPF_PROG_TYPE_CGROUP_SKB:
+ case BPF_PROG_TYPE_CGROUP_SOCK:
+ case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
+ case BPF_PROG_TYPE_CGROUP_SOCKOPT:
+ case BPF_PROG_TYPE_CGROUP_SYSCTL:
+ case BPF_PROG_TYPE_SOCK_OPS:
+ case BPF_PROG_TYPE_LSM:
+ if (ptype == BPF_PROG_TYPE_LSM &&
+ prog->expected_attach_type != BPF_LSM_CGROUP)
+ ret = -EINVAL;
+ else
+ ret = cgroup_bpf_prog_attach(attr, ptype, prog);
+ break;
+ case BPF_PROG_TYPE_SCHED_CLS:
+ ret = tcx_prog_attach(attr, prog);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ if (ret)
+ bpf_prog_put(prog);
+ return ret;
+}
+
+#define BPF_PROG_DETACH_LAST_FIELD expected_revision
+
+static int bpf_prog_detach(const union bpf_attr *attr)
+{
+ struct bpf_prog *prog = NULL;
+ enum bpf_prog_type ptype;
+ int ret;
+
+ if (CHECK_ATTR(BPF_PROG_DETACH))
+ return -EINVAL;
+
+ ptype = attach_type_to_prog_type(attr->attach_type);
+ if (bpf_mprog_supported(ptype)) {
+ if (ptype == BPF_PROG_TYPE_UNSPEC)
+ return -EINVAL;
+ if (attr->attach_flags & ~BPF_F_ATTACH_MASK_MPROG)
+ return -EINVAL;
+ if (attr->attach_bpf_fd) {
+ prog = bpf_prog_get_type(attr->attach_bpf_fd, ptype);
+ if (IS_ERR(prog))
+ return PTR_ERR(prog);
+ }
+ } else if (attr->attach_flags ||
+ attr->relative_fd ||
+ attr->expected_revision) {
+ return -EINVAL;
+ }
+
+ switch (ptype) {
+ case BPF_PROG_TYPE_SK_MSG:
+ case BPF_PROG_TYPE_SK_SKB:
+ ret = sock_map_prog_detach(attr, ptype);
+ break;
+ case BPF_PROG_TYPE_LIRC_MODE2:
+ ret = lirc_prog_detach(attr);
+ break;
+ case BPF_PROG_TYPE_FLOW_DISSECTOR:
+ ret = netns_bpf_prog_detach(attr, ptype);
+ break;
+ case BPF_PROG_TYPE_CGROUP_DEVICE:
+ case BPF_PROG_TYPE_CGROUP_SKB:
+ case BPF_PROG_TYPE_CGROUP_SOCK:
+ case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
+ case BPF_PROG_TYPE_CGROUP_SOCKOPT:
+ case BPF_PROG_TYPE_CGROUP_SYSCTL:
+ case BPF_PROG_TYPE_SOCK_OPS:
+ case BPF_PROG_TYPE_LSM:
+ ret = cgroup_bpf_prog_detach(attr, ptype);
+ break;
+ case BPF_PROG_TYPE_SCHED_CLS:
+ ret = tcx_prog_detach(attr, prog);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ if (prog)
+ bpf_prog_put(prog);
+ return ret;
+}
+
+#define BPF_PROG_QUERY_LAST_FIELD query.revision
+
+static int bpf_prog_query(const union bpf_attr *attr,
+ union bpf_attr __user *uattr)
+{
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+ if (CHECK_ATTR(BPF_PROG_QUERY))
+ return -EINVAL;
+ if (attr->query.query_flags & ~BPF_F_QUERY_EFFECTIVE)
+ return -EINVAL;
+
+ switch (attr->query.attach_type) {
+ case BPF_CGROUP_INET_INGRESS:
+ case BPF_CGROUP_INET_EGRESS:
+ case BPF_CGROUP_INET_SOCK_CREATE:
+ case BPF_CGROUP_INET_SOCK_RELEASE:
+ case BPF_CGROUP_INET4_BIND:
+ case BPF_CGROUP_INET6_BIND:
+ case BPF_CGROUP_INET4_POST_BIND:
+ case BPF_CGROUP_INET6_POST_BIND:
+ case BPF_CGROUP_INET4_CONNECT:
+ case BPF_CGROUP_INET6_CONNECT:
+ case BPF_CGROUP_INET4_GETPEERNAME:
+ case BPF_CGROUP_INET6_GETPEERNAME:
+ case BPF_CGROUP_INET4_GETSOCKNAME:
+ case BPF_CGROUP_INET6_GETSOCKNAME:
+ case BPF_CGROUP_UDP4_SENDMSG:
+ case BPF_CGROUP_UDP6_SENDMSG:
+ case BPF_CGROUP_UDP4_RECVMSG:
+ case BPF_CGROUP_UDP6_RECVMSG:
+ case BPF_CGROUP_SOCK_OPS:
+ case BPF_CGROUP_DEVICE:
+ case BPF_CGROUP_SYSCTL:
+ case BPF_CGROUP_GETSOCKOPT:
+ case BPF_CGROUP_SETSOCKOPT:
+ case BPF_LSM_CGROUP:
+ return cgroup_bpf_prog_query(attr, uattr);
+ case BPF_LIRC_MODE2:
+ return lirc_prog_query(attr, uattr);
+ case BPF_FLOW_DISSECTOR:
+ case BPF_SK_LOOKUP:
+ return netns_bpf_prog_query(attr, uattr);
+ case BPF_SK_SKB_STREAM_PARSER:
+ case BPF_SK_SKB_STREAM_VERDICT:
+ case BPF_SK_MSG_VERDICT:
+ case BPF_SK_SKB_VERDICT:
+ return sock_map_bpf_prog_query(attr, uattr);
+ case BPF_TCX_INGRESS:
+ case BPF_TCX_EGRESS:
+ return tcx_prog_query(attr, uattr);
+ default:
+ return -EINVAL;
+ }
+}
+
+#define BPF_PROG_TEST_RUN_LAST_FIELD test.batch_size
+
+static int bpf_prog_test_run(const union bpf_attr *attr,
+ union bpf_attr __user *uattr)
+{
+ struct bpf_prog *prog;
+ int ret = -ENOTSUPP;
+
+ if (CHECK_ATTR(BPF_PROG_TEST_RUN))
+ return -EINVAL;
+
+ if ((attr->test.ctx_size_in && !attr->test.ctx_in) ||
+ (!attr->test.ctx_size_in && attr->test.ctx_in))
+ return -EINVAL;
+
+ if ((attr->test.ctx_size_out && !attr->test.ctx_out) ||
+ (!attr->test.ctx_size_out && attr->test.ctx_out))
+ return -EINVAL;
+
+ prog = bpf_prog_get(attr->test.prog_fd);
+ if (IS_ERR(prog))
+ return PTR_ERR(prog);
+
+ if (prog->aux->ops->test_run)
+ ret = prog->aux->ops->test_run(prog, attr, uattr);
+
+ bpf_prog_put(prog);
+ return ret;
+}
+
+#define BPF_OBJ_GET_NEXT_ID_LAST_FIELD next_id
+
+static int bpf_obj_get_next_id(const union bpf_attr *attr,
+ union bpf_attr __user *uattr,
+ struct idr *idr,
+ spinlock_t *lock)
+{
+ u32 next_id = attr->start_id;
+ int err = 0;
+
+ if (CHECK_ATTR(BPF_OBJ_GET_NEXT_ID) || next_id >= INT_MAX)
+ return -EINVAL;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ next_id++;
+ spin_lock_bh(lock);
+ if (!idr_get_next(idr, &next_id))
+ err = -ENOENT;
+ spin_unlock_bh(lock);
+
+ if (!err)
+ err = put_user(next_id, &uattr->next_id);
+
+ return err;
+}
+
+struct bpf_map *bpf_map_get_curr_or_next(u32 *id)
+{
+ struct bpf_map *map;
+
+ spin_lock_bh(&map_idr_lock);
+again:
+ map = idr_get_next(&map_idr, id);
+ if (map) {
+ map = __bpf_map_inc_not_zero(map, false);
+ if (IS_ERR(map)) {
+ (*id)++;
+ goto again;
+ }
+ }
+ spin_unlock_bh(&map_idr_lock);
+
+ return map;
+}
+
+struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id)
+{
+ struct bpf_prog *prog;
+
+ spin_lock_bh(&prog_idr_lock);
+again:
+ prog = idr_get_next(&prog_idr, id);
+ if (prog) {
+ prog = bpf_prog_inc_not_zero(prog);
+ if (IS_ERR(prog)) {
+ (*id)++;
+ goto again;
+ }
+ }
+ spin_unlock_bh(&prog_idr_lock);
+
+ return prog;
+}
+
+#define BPF_PROG_GET_FD_BY_ID_LAST_FIELD prog_id
+
+struct bpf_prog *bpf_prog_by_id(u32 id)
+{
+ struct bpf_prog *prog;
+
+ if (!id)
+ return ERR_PTR(-ENOENT);
+
+ spin_lock_bh(&prog_idr_lock);
+ prog = idr_find(&prog_idr, id);
+ if (prog)
+ prog = bpf_prog_inc_not_zero(prog);
+ else
+ prog = ERR_PTR(-ENOENT);
+ spin_unlock_bh(&prog_idr_lock);
+ return prog;
+}
+
+static int bpf_prog_get_fd_by_id(const union bpf_attr *attr)
+{
+ struct bpf_prog *prog;
+ u32 id = attr->prog_id;
+ int fd;
+
+ if (CHECK_ATTR(BPF_PROG_GET_FD_BY_ID))
+ return -EINVAL;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ prog = bpf_prog_by_id(id);
+ if (IS_ERR(prog))
+ return PTR_ERR(prog);
+
+ fd = bpf_prog_new_fd(prog);
+ if (fd < 0)
+ bpf_prog_put(prog);
+
+ return fd;
+}
+
+#define BPF_MAP_GET_FD_BY_ID_LAST_FIELD open_flags
+
+static int bpf_map_get_fd_by_id(const union bpf_attr *attr)
+{
+ struct bpf_map *map;
+ u32 id = attr->map_id;
+ int f_flags;
+ int fd;
+
+ if (CHECK_ATTR(BPF_MAP_GET_FD_BY_ID) ||
+ attr->open_flags & ~BPF_OBJ_FLAG_MASK)
+ return -EINVAL;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ f_flags = bpf_get_file_flag(attr->open_flags);
+ if (f_flags < 0)
+ return f_flags;
+
+ spin_lock_bh(&map_idr_lock);
+ map = idr_find(&map_idr, id);
+ if (map)
+ map = __bpf_map_inc_not_zero(map, true);
+ else
+ map = ERR_PTR(-ENOENT);
+ spin_unlock_bh(&map_idr_lock);
+
+ if (IS_ERR(map))
+ return PTR_ERR(map);
+
+ fd = bpf_map_new_fd(map, f_flags);
+ if (fd < 0)
+ bpf_map_put_with_uref(map);
+
+ return fd;
+}
+
+static const struct bpf_map *bpf_map_from_imm(const struct bpf_prog *prog,
+ unsigned long addr, u32 *off,
+ u32 *type)
+{
+ const struct bpf_map *map;
+ int i;
+
+ mutex_lock(&prog->aux->used_maps_mutex);
+ for (i = 0, *off = 0; i < prog->aux->used_map_cnt; i++) {
+ map = prog->aux->used_maps[i];
+ if (map == (void *)addr) {
+ *type = BPF_PSEUDO_MAP_FD;
+ goto out;
+ }
+ if (!map->ops->map_direct_value_meta)
+ continue;
+ if (!map->ops->map_direct_value_meta(map, addr, off)) {
+ *type = BPF_PSEUDO_MAP_VALUE;
+ goto out;
+ }
+ }
+ map = NULL;
+
+out:
+ mutex_unlock(&prog->aux->used_maps_mutex);
+ return map;
+}
+
+static struct bpf_insn *bpf_insn_prepare_dump(const struct bpf_prog *prog,
+ const struct cred *f_cred)
+{
+ const struct bpf_map *map;
+ struct bpf_insn *insns;
+ u32 off, type;
+ u64 imm;
+ u8 code;
+ int i;
+
+ insns = kmemdup(prog->insnsi, bpf_prog_insn_size(prog),
+ GFP_USER);
+ if (!insns)
+ return insns;
+
+ for (i = 0; i < prog->len; i++) {
+ code = insns[i].code;
+
+ if (code == (BPF_JMP | BPF_TAIL_CALL)) {
+ insns[i].code = BPF_JMP | BPF_CALL;
+ insns[i].imm = BPF_FUNC_tail_call;
+ /* fall-through */
+ }
+ if (code == (BPF_JMP | BPF_CALL) ||
+ code == (BPF_JMP | BPF_CALL_ARGS)) {
+ if (code == (BPF_JMP | BPF_CALL_ARGS))
+ insns[i].code = BPF_JMP | BPF_CALL;
+ if (!bpf_dump_raw_ok(f_cred))
+ insns[i].imm = 0;
+ continue;
+ }
+ if (BPF_CLASS(code) == BPF_LDX && BPF_MODE(code) == BPF_PROBE_MEM) {
+ insns[i].code = BPF_LDX | BPF_SIZE(code) | BPF_MEM;
+ continue;
+ }
+
+ if (code != (BPF_LD | BPF_IMM | BPF_DW))
+ continue;
+
+ imm = ((u64)insns[i + 1].imm << 32) | (u32)insns[i].imm;
+ map = bpf_map_from_imm(prog, imm, &off, &type);
+ if (map) {
+ insns[i].src_reg = type;
+ insns[i].imm = map->id;
+ insns[i + 1].imm = off;
+ continue;
+ }
+ }
+
+ return insns;
+}
+
+static int set_info_rec_size(struct bpf_prog_info *info)
+{
+ /*
+ * Ensure info.*_rec_size is the same as kernel expected size
+ *
+ * or
+ *
+ * Only allow zero *_rec_size if both _rec_size and _cnt are
+ * zero. In this case, the kernel will set the expected
+ * _rec_size back to the info.
+ */
+
+ if ((info->nr_func_info || info->func_info_rec_size) &&
+ info->func_info_rec_size != sizeof(struct bpf_func_info))
+ return -EINVAL;
+
+ if ((info->nr_line_info || info->line_info_rec_size) &&
+ info->line_info_rec_size != sizeof(struct bpf_line_info))
+ return -EINVAL;
+
+ if ((info->nr_jited_line_info || info->jited_line_info_rec_size) &&
+ info->jited_line_info_rec_size != sizeof(__u64))
+ return -EINVAL;
+
+ info->func_info_rec_size = sizeof(struct bpf_func_info);
+ info->line_info_rec_size = sizeof(struct bpf_line_info);
+ info->jited_line_info_rec_size = sizeof(__u64);
+
+ return 0;
+}
+
+static int bpf_prog_get_info_by_fd(struct file *file,
+ struct bpf_prog *prog,
+ const union bpf_attr *attr,
+ union bpf_attr __user *uattr)
+{
+ struct bpf_prog_info __user *uinfo = u64_to_user_ptr(attr->info.info);
+ struct btf *attach_btf = bpf_prog_get_target_btf(prog);
+ struct bpf_prog_info info;
+ u32 info_len = attr->info.info_len;
+ struct bpf_prog_kstats stats;
+ char __user *uinsns;
+ u32 ulen;
+ int err;
+
+ err = bpf_check_uarg_tail_zero(USER_BPFPTR(uinfo), sizeof(info), info_len);
+ if (err)
+ return err;
+ info_len = min_t(u32, sizeof(info), info_len);
+
+ memset(&info, 0, sizeof(info));
+ if (copy_from_user(&info, uinfo, info_len))
+ return -EFAULT;
+
+ info.type = prog->type;
+ info.id = prog->aux->id;
+ info.load_time = prog->aux->load_time;
+ info.created_by_uid = from_kuid_munged(current_user_ns(),
+ prog->aux->user->uid);
+ info.gpl_compatible = prog->gpl_compatible;
+
+ memcpy(info.tag, prog->tag, sizeof(prog->tag));
+ memcpy(info.name, prog->aux->name, sizeof(prog->aux->name));
+
+ mutex_lock(&prog->aux->used_maps_mutex);
+ ulen = info.nr_map_ids;
+ info.nr_map_ids = prog->aux->used_map_cnt;
+ ulen = min_t(u32, info.nr_map_ids, ulen);
+ if (ulen) {
+ u32 __user *user_map_ids = u64_to_user_ptr(info.map_ids);
+ u32 i;
+
+ for (i = 0; i < ulen; i++)
+ if (put_user(prog->aux->used_maps[i]->id,
+ &user_map_ids[i])) {
+ mutex_unlock(&prog->aux->used_maps_mutex);
+ return -EFAULT;
+ }
+ }
+ mutex_unlock(&prog->aux->used_maps_mutex);
+
+ err = set_info_rec_size(&info);
+ if (err)
+ return err;
+
+ bpf_prog_get_stats(prog, &stats);
+ info.run_time_ns = stats.nsecs;
+ info.run_cnt = stats.cnt;
+ info.recursion_misses = stats.misses;
+
+ info.verified_insns = prog->aux->verified_insns;
+
+ if (!bpf_capable()) {
+ info.jited_prog_len = 0;
+ info.xlated_prog_len = 0;
+ info.nr_jited_ksyms = 0;
+ info.nr_jited_func_lens = 0;
+ info.nr_func_info = 0;
+ info.nr_line_info = 0;
+ info.nr_jited_line_info = 0;
+ goto done;
+ }
+
+ ulen = info.xlated_prog_len;
+ info.xlated_prog_len = bpf_prog_insn_size(prog);
+ if (info.xlated_prog_len && ulen) {
+ struct bpf_insn *insns_sanitized;
+ bool fault;
+
+ if (prog->blinded && !bpf_dump_raw_ok(file->f_cred)) {
+ info.xlated_prog_insns = 0;
+ goto done;
+ }
+ insns_sanitized = bpf_insn_prepare_dump(prog, file->f_cred);
+ if (!insns_sanitized)
+ return -ENOMEM;
+ uinsns = u64_to_user_ptr(info.xlated_prog_insns);
+ ulen = min_t(u32, info.xlated_prog_len, ulen);
+ fault = copy_to_user(uinsns, insns_sanitized, ulen);
+ kfree(insns_sanitized);
+ if (fault)
+ return -EFAULT;
+ }
+
+ if (bpf_prog_is_offloaded(prog->aux)) {
+ err = bpf_prog_offload_info_fill(&info, prog);
+ if (err)
+ return err;
+ goto done;
+ }
+
+ /* NOTE: the following code is supposed to be skipped for offload.
+ * bpf_prog_offload_info_fill() is the place to fill similar fields
+ * for offload.
+ */
+ ulen = info.jited_prog_len;
+ if (prog->aux->func_cnt) {
+ u32 i;
+
+ info.jited_prog_len = 0;
+ for (i = 0; i < prog->aux->func_cnt; i++)
+ info.jited_prog_len += prog->aux->func[i]->jited_len;
+ } else {
+ info.jited_prog_len = prog->jited_len;
+ }
+
+ if (info.jited_prog_len && ulen) {
+ if (bpf_dump_raw_ok(file->f_cred)) {
+ uinsns = u64_to_user_ptr(info.jited_prog_insns);
+ ulen = min_t(u32, info.jited_prog_len, ulen);
+
+ /* for multi-function programs, copy the JITed
+ * instructions for all the functions
+ */
+ if (prog->aux->func_cnt) {
+ u32 len, free, i;
+ u8 *img;
+
+ free = ulen;
+ for (i = 0; i < prog->aux->func_cnt; i++) {
+ len = prog->aux->func[i]->jited_len;
+ len = min_t(u32, len, free);
+ img = (u8 *) prog->aux->func[i]->bpf_func;
+ if (copy_to_user(uinsns, img, len))
+ return -EFAULT;
+ uinsns += len;
+ free -= len;
+ if (!free)
+ break;
+ }
+ } else {
+ if (copy_to_user(uinsns, prog->bpf_func, ulen))
+ return -EFAULT;
+ }
+ } else {
+ info.jited_prog_insns = 0;
+ }
+ }
+
+ ulen = info.nr_jited_ksyms;
+ info.nr_jited_ksyms = prog->aux->func_cnt ? : 1;
+ if (ulen) {
+ if (bpf_dump_raw_ok(file->f_cred)) {
+ unsigned long ksym_addr;
+ u64 __user *user_ksyms;
+ u32 i;
+
+ /* copy the address of the kernel symbol
+ * corresponding to each function
+ */
+ ulen = min_t(u32, info.nr_jited_ksyms, ulen);
+ user_ksyms = u64_to_user_ptr(info.jited_ksyms);
+ if (prog->aux->func_cnt) {
+ for (i = 0; i < ulen; i++) {
+ ksym_addr = (unsigned long)
+ prog->aux->func[i]->bpf_func;
+ if (put_user((u64) ksym_addr,
+ &user_ksyms[i]))
+ return -EFAULT;
+ }
+ } else {
+ ksym_addr = (unsigned long) prog->bpf_func;
+ if (put_user((u64) ksym_addr, &user_ksyms[0]))
+ return -EFAULT;
+ }
+ } else {
+ info.jited_ksyms = 0;
+ }
+ }
+
+ ulen = info.nr_jited_func_lens;
+ info.nr_jited_func_lens = prog->aux->func_cnt ? : 1;
+ if (ulen) {
+ if (bpf_dump_raw_ok(file->f_cred)) {
+ u32 __user *user_lens;
+ u32 func_len, i;
+
+ /* copy the JITed image lengths for each function */
+ ulen = min_t(u32, info.nr_jited_func_lens, ulen);
+ user_lens = u64_to_user_ptr(info.jited_func_lens);
+ if (prog->aux->func_cnt) {
+ for (i = 0; i < ulen; i++) {
+ func_len =
+ prog->aux->func[i]->jited_len;
+ if (put_user(func_len, &user_lens[i]))
+ return -EFAULT;
+ }
+ } else {
+ func_len = prog->jited_len;
+ if (put_user(func_len, &user_lens[0]))
+ return -EFAULT;
+ }
+ } else {
+ info.jited_func_lens = 0;
+ }
+ }
+
+ if (prog->aux->btf)
+ info.btf_id = btf_obj_id(prog->aux->btf);
+ info.attach_btf_id = prog->aux->attach_btf_id;
+ if (attach_btf)
+ info.attach_btf_obj_id = btf_obj_id(attach_btf);
+
+ ulen = info.nr_func_info;
+ info.nr_func_info = prog->aux->func_info_cnt;
+ if (info.nr_func_info && ulen) {
+ char __user *user_finfo;
+
+ user_finfo = u64_to_user_ptr(info.func_info);
+ ulen = min_t(u32, info.nr_func_info, ulen);
+ if (copy_to_user(user_finfo, prog->aux->func_info,
+ info.func_info_rec_size * ulen))
+ return -EFAULT;
+ }
+
+ ulen = info.nr_line_info;
+ info.nr_line_info = prog->aux->nr_linfo;
+ if (info.nr_line_info && ulen) {
+ __u8 __user *user_linfo;
+
+ user_linfo = u64_to_user_ptr(info.line_info);
+ ulen = min_t(u32, info.nr_line_info, ulen);
+ if (copy_to_user(user_linfo, prog->aux->linfo,
+ info.line_info_rec_size * ulen))
+ return -EFAULT;
+ }
+
+ ulen = info.nr_jited_line_info;
+ if (prog->aux->jited_linfo)
+ info.nr_jited_line_info = prog->aux->nr_linfo;
+ else
+ info.nr_jited_line_info = 0;
+ if (info.nr_jited_line_info && ulen) {
+ if (bpf_dump_raw_ok(file->f_cred)) {
+ unsigned long line_addr;
+ __u64 __user *user_linfo;
+ u32 i;
+
+ user_linfo = u64_to_user_ptr(info.jited_line_info);
+ ulen = min_t(u32, info.nr_jited_line_info, ulen);
+ for (i = 0; i < ulen; i++) {
+ line_addr = (unsigned long)prog->aux->jited_linfo[i];
+ if (put_user((__u64)line_addr, &user_linfo[i]))
+ return -EFAULT;
+ }
+ } else {
+ info.jited_line_info = 0;
+ }
+ }
+
+ ulen = info.nr_prog_tags;
+ info.nr_prog_tags = prog->aux->func_cnt ? : 1;
+ if (ulen) {
+ __u8 __user (*user_prog_tags)[BPF_TAG_SIZE];
+ u32 i;
+
+ user_prog_tags = u64_to_user_ptr(info.prog_tags);
+ ulen = min_t(u32, info.nr_prog_tags, ulen);
+ if (prog->aux->func_cnt) {
+ for (i = 0; i < ulen; i++) {
+ if (copy_to_user(user_prog_tags[i],
+ prog->aux->func[i]->tag,
+ BPF_TAG_SIZE))
+ return -EFAULT;
+ }
+ } else {
+ if (copy_to_user(user_prog_tags[0],
+ prog->tag, BPF_TAG_SIZE))
+ return -EFAULT;
+ }
+ }
+
+done:
+ if (copy_to_user(uinfo, &info, info_len) ||
+ put_user(info_len, &uattr->info.info_len))
+ return -EFAULT;
+
+ return 0;
+}
+
+static int bpf_map_get_info_by_fd(struct file *file,
+ struct bpf_map *map,
+ const union bpf_attr *attr,
+ union bpf_attr __user *uattr)
+{
+ struct bpf_map_info __user *uinfo = u64_to_user_ptr(attr->info.info);
+ struct bpf_map_info info;
+ u32 info_len = attr->info.info_len;
+ int err;
+
+ err = bpf_check_uarg_tail_zero(USER_BPFPTR(uinfo), sizeof(info), info_len);
+ if (err)
+ return err;
+ info_len = min_t(u32, sizeof(info), info_len);
+
+ memset(&info, 0, sizeof(info));
+ info.type = map->map_type;
+ info.id = map->id;
+ info.key_size = map->key_size;
+ info.value_size = map->value_size;
+ info.max_entries = map->max_entries;
+ info.map_flags = map->map_flags;
+ info.map_extra = map->map_extra;
+ memcpy(info.name, map->name, sizeof(map->name));
+
+ if (map->btf) {
+ info.btf_id = btf_obj_id(map->btf);
+ info.btf_key_type_id = map->btf_key_type_id;
+ info.btf_value_type_id = map->btf_value_type_id;
+ }
+ info.btf_vmlinux_value_type_id = map->btf_vmlinux_value_type_id;
+
+ if (bpf_map_is_offloaded(map)) {
+ err = bpf_map_offload_info_fill(&info, map);
+ if (err)
+ return err;
+ }
+
+ if (copy_to_user(uinfo, &info, info_len) ||
+ put_user(info_len, &uattr->info.info_len))
+ return -EFAULT;
+
+ return 0;
+}
+
+static int bpf_btf_get_info_by_fd(struct file *file,
+ struct btf *btf,
+ const union bpf_attr *attr,
+ union bpf_attr __user *uattr)
+{
+ struct bpf_btf_info __user *uinfo = u64_to_user_ptr(attr->info.info);
+ u32 info_len = attr->info.info_len;
+ int err;
+
+ err = bpf_check_uarg_tail_zero(USER_BPFPTR(uinfo), sizeof(*uinfo), info_len);
+ if (err)
+ return err;
+
+ return btf_get_info_by_fd(btf, attr, uattr);
+}
+
+static int bpf_link_get_info_by_fd(struct file *file,
+ struct bpf_link *link,
+ const union bpf_attr *attr,
+ union bpf_attr __user *uattr)
+{
+ struct bpf_link_info __user *uinfo = u64_to_user_ptr(attr->info.info);
+ struct bpf_link_info info;
+ u32 info_len = attr->info.info_len;
+ int err;
+
+ err = bpf_check_uarg_tail_zero(USER_BPFPTR(uinfo), sizeof(info), info_len);
+ if (err)
+ return err;
+ info_len = min_t(u32, sizeof(info), info_len);
+
+ memset(&info, 0, sizeof(info));
+ if (copy_from_user(&info, uinfo, info_len))
+ return -EFAULT;
+
+ info.type = link->type;
+ info.id = link->id;
+ if (link->prog)
+ info.prog_id = link->prog->aux->id;
+
+ if (link->ops->fill_link_info) {
+ err = link->ops->fill_link_info(link, &info);
+ if (err)
+ return err;
+ }
+
+ if (copy_to_user(uinfo, &info, info_len) ||
+ put_user(info_len, &uattr->info.info_len))
+ return -EFAULT;
+
+ return 0;
+}
+
+
+#define BPF_OBJ_GET_INFO_BY_FD_LAST_FIELD info.info
+
+static int bpf_obj_get_info_by_fd(const union bpf_attr *attr,
+ union bpf_attr __user *uattr)
+{
+ int ufd = attr->info.bpf_fd;
+ struct fd f;
+ int err;
+
+ if (CHECK_ATTR(BPF_OBJ_GET_INFO_BY_FD))
+ return -EINVAL;
+
+ f = fdget(ufd);
+ if (!f.file)
+ return -EBADFD;
+
+ if (f.file->f_op == &bpf_prog_fops)
+ err = bpf_prog_get_info_by_fd(f.file, f.file->private_data, attr,
+ uattr);
+ else if (f.file->f_op == &bpf_map_fops)
+ err = bpf_map_get_info_by_fd(f.file, f.file->private_data, attr,
+ uattr);
+ else if (f.file->f_op == &btf_fops)
+ err = bpf_btf_get_info_by_fd(f.file, f.file->private_data, attr, uattr);
+ else if (f.file->f_op == &bpf_link_fops)
+ err = bpf_link_get_info_by_fd(f.file, f.file->private_data,
+ attr, uattr);
+ else
+ err = -EINVAL;
+
+ fdput(f);
+ return err;
+}
+
+#define BPF_BTF_LOAD_LAST_FIELD btf_log_true_size
+
+static int bpf_btf_load(const union bpf_attr *attr, bpfptr_t uattr, __u32 uattr_size)
+{
+ if (CHECK_ATTR(BPF_BTF_LOAD))
+ return -EINVAL;
+
+ if (!bpf_capable())
+ return -EPERM;
+
+ return btf_new_fd(attr, uattr, uattr_size);
+}
+
+#define BPF_BTF_GET_FD_BY_ID_LAST_FIELD btf_id
+
+static int bpf_btf_get_fd_by_id(const union bpf_attr *attr)
+{
+ if (CHECK_ATTR(BPF_BTF_GET_FD_BY_ID))
+ return -EINVAL;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ return btf_get_fd_by_id(attr->btf_id);
+}
+
+static int bpf_task_fd_query_copy(const union bpf_attr *attr,
+ union bpf_attr __user *uattr,
+ u32 prog_id, u32 fd_type,
+ const char *buf, u64 probe_offset,
+ u64 probe_addr)
+{
+ char __user *ubuf = u64_to_user_ptr(attr->task_fd_query.buf);
+ u32 len = buf ? strlen(buf) : 0, input_len;
+ int err = 0;
+
+ if (put_user(len, &uattr->task_fd_query.buf_len))
+ return -EFAULT;
+ input_len = attr->task_fd_query.buf_len;
+ if (input_len && ubuf) {
+ if (!len) {
+ /* nothing to copy, just make ubuf NULL terminated */
+ char zero = '\0';
+
+ if (put_user(zero, ubuf))
+ return -EFAULT;
+ } else if (input_len >= len + 1) {
+ /* ubuf can hold the string with NULL terminator */
+ if (copy_to_user(ubuf, buf, len + 1))
+ return -EFAULT;
+ } else {
+ /* ubuf cannot hold the string with NULL terminator,
+ * do a partial copy with NULL terminator.
+ */
+ char zero = '\0';
+
+ err = -ENOSPC;
+ if (copy_to_user(ubuf, buf, input_len - 1))
+ return -EFAULT;
+ if (put_user(zero, ubuf + input_len - 1))
+ return -EFAULT;
+ }
+ }
+
+ if (put_user(prog_id, &uattr->task_fd_query.prog_id) ||
+ put_user(fd_type, &uattr->task_fd_query.fd_type) ||
+ put_user(probe_offset, &uattr->task_fd_query.probe_offset) ||
+ put_user(probe_addr, &uattr->task_fd_query.probe_addr))
+ return -EFAULT;
+
+ return err;
+}
+
+#define BPF_TASK_FD_QUERY_LAST_FIELD task_fd_query.probe_addr
+
+static int bpf_task_fd_query(const union bpf_attr *attr,
+ union bpf_attr __user *uattr)
+{
+ pid_t pid = attr->task_fd_query.pid;
+ u32 fd = attr->task_fd_query.fd;
+ const struct perf_event *event;
+ struct task_struct *task;
+ struct file *file;
+ int err;
+
+ if (CHECK_ATTR(BPF_TASK_FD_QUERY))
+ return -EINVAL;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (attr->task_fd_query.flags != 0)
+ return -EINVAL;
+
+ rcu_read_lock();
+ task = get_pid_task(find_vpid(pid), PIDTYPE_PID);
+ rcu_read_unlock();
+ if (!task)
+ return -ENOENT;
+
+ err = 0;
+ file = fget_task(task, fd);
+ put_task_struct(task);
+ if (!file)
+ return -EBADF;
+
+ if (file->f_op == &bpf_link_fops) {
+ struct bpf_link *link = file->private_data;
+
+ if (link->ops == &bpf_raw_tp_link_lops) {
+ struct bpf_raw_tp_link *raw_tp =
+ container_of(link, struct bpf_raw_tp_link, link);
+ struct bpf_raw_event_map *btp = raw_tp->btp;
+
+ err = bpf_task_fd_query_copy(attr, uattr,
+ raw_tp->link.prog->aux->id,
+ BPF_FD_TYPE_RAW_TRACEPOINT,
+ btp->tp->name, 0, 0);
+ goto put_file;
+ }
+ goto out_not_supp;
+ }
+
+ event = perf_get_event(file);
+ if (!IS_ERR(event)) {
+ u64 probe_offset, probe_addr;
+ u32 prog_id, fd_type;
+ const char *buf;
+
+ err = bpf_get_perf_event_info(event, &prog_id, &fd_type,
+ &buf, &probe_offset,
+ &probe_addr);
+ if (!err)
+ err = bpf_task_fd_query_copy(attr, uattr, prog_id,
+ fd_type, buf,
+ probe_offset,
+ probe_addr);
+ goto put_file;
+ }
+
+out_not_supp:
+ err = -ENOTSUPP;
+put_file:
+ fput(file);
+ return err;
+}
+
+#define BPF_MAP_BATCH_LAST_FIELD batch.flags
+
+#define BPF_DO_BATCH(fn, ...) \
+ do { \
+ if (!fn) { \
+ err = -ENOTSUPP; \
+ goto err_put; \
+ } \
+ err = fn(__VA_ARGS__); \
+ } while (0)
+
+static int bpf_map_do_batch(const union bpf_attr *attr,
+ union bpf_attr __user *uattr,
+ int cmd)
+{
+ bool has_read = cmd == BPF_MAP_LOOKUP_BATCH ||
+ cmd == BPF_MAP_LOOKUP_AND_DELETE_BATCH;
+ bool has_write = cmd != BPF_MAP_LOOKUP_BATCH;
+ struct bpf_map *map;
+ int err, ufd;
+ struct fd f;
+
+ if (CHECK_ATTR(BPF_MAP_BATCH))
+ return -EINVAL;
+
+ ufd = attr->batch.map_fd;
+ f = fdget(ufd);
+ map = __bpf_map_get(f);
+ if (IS_ERR(map))
+ return PTR_ERR(map);
+ if (has_write)
+ bpf_map_write_active_inc(map);
+ if (has_read && !(map_get_sys_perms(map, f) & FMODE_CAN_READ)) {
+ err = -EPERM;
+ goto err_put;
+ }
+ if (has_write && !(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
+ err = -EPERM;
+ goto err_put;
+ }
+
+ if (cmd == BPF_MAP_LOOKUP_BATCH)
+ BPF_DO_BATCH(map->ops->map_lookup_batch, map, attr, uattr);
+ else if (cmd == BPF_MAP_LOOKUP_AND_DELETE_BATCH)
+ BPF_DO_BATCH(map->ops->map_lookup_and_delete_batch, map, attr, uattr);
+ else if (cmd == BPF_MAP_UPDATE_BATCH)
+ BPF_DO_BATCH(map->ops->map_update_batch, map, f.file, attr, uattr);
+ else
+ BPF_DO_BATCH(map->ops->map_delete_batch, map, attr, uattr);
+err_put:
+ if (has_write)
+ bpf_map_write_active_dec(map);
+ fdput(f);
+ return err;
+}
+
+#define BPF_LINK_CREATE_LAST_FIELD link_create.uprobe_multi.pid
+static int link_create(union bpf_attr *attr, bpfptr_t uattr)
+{
+ struct bpf_prog *prog;
+ int ret;
+
+ if (CHECK_ATTR(BPF_LINK_CREATE))
+ return -EINVAL;
+
+ if (attr->link_create.attach_type == BPF_STRUCT_OPS)
+ return bpf_struct_ops_link_create(attr);
+
+ prog = bpf_prog_get(attr->link_create.prog_fd);
+ if (IS_ERR(prog))
+ return PTR_ERR(prog);
+
+ ret = bpf_prog_attach_check_attach_type(prog,
+ attr->link_create.attach_type);
+ if (ret)
+ goto out;
+
+ switch (prog->type) {
+ case BPF_PROG_TYPE_CGROUP_SKB:
+ case BPF_PROG_TYPE_CGROUP_SOCK:
+ case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
+ case BPF_PROG_TYPE_SOCK_OPS:
+ case BPF_PROG_TYPE_CGROUP_DEVICE:
+ case BPF_PROG_TYPE_CGROUP_SYSCTL:
+ case BPF_PROG_TYPE_CGROUP_SOCKOPT:
+ ret = cgroup_bpf_link_attach(attr, prog);
+ break;
+ case BPF_PROG_TYPE_EXT:
+ ret = bpf_tracing_prog_attach(prog,
+ attr->link_create.target_fd,
+ attr->link_create.target_btf_id,
+ attr->link_create.tracing.cookie);
+ break;
+ case BPF_PROG_TYPE_LSM:
+ case BPF_PROG_TYPE_TRACING:
+ if (attr->link_create.attach_type != prog->expected_attach_type) {
+ ret = -EINVAL;
+ goto out;
+ }
+ if (prog->expected_attach_type == BPF_TRACE_RAW_TP)
+ ret = bpf_raw_tp_link_attach(prog, NULL);
+ else if (prog->expected_attach_type == BPF_TRACE_ITER)
+ ret = bpf_iter_link_attach(attr, uattr, prog);
+ else if (prog->expected_attach_type == BPF_LSM_CGROUP)
+ ret = cgroup_bpf_link_attach(attr, prog);
+ else
+ ret = bpf_tracing_prog_attach(prog,
+ attr->link_create.target_fd,
+ attr->link_create.target_btf_id,
+ attr->link_create.tracing.cookie);
+ break;
+ case BPF_PROG_TYPE_FLOW_DISSECTOR:
+ case BPF_PROG_TYPE_SK_LOOKUP:
+ ret = netns_bpf_link_create(attr, prog);
+ break;
+#ifdef CONFIG_NET
+ case BPF_PROG_TYPE_XDP:
+ ret = bpf_xdp_link_attach(attr, prog);
+ break;
+ case BPF_PROG_TYPE_SCHED_CLS:
+ ret = tcx_link_attach(attr, prog);
+ break;
+ case BPF_PROG_TYPE_NETFILTER:
+ ret = bpf_nf_link_attach(attr, prog);
+ break;
+#endif
+ case BPF_PROG_TYPE_PERF_EVENT:
+ case BPF_PROG_TYPE_TRACEPOINT:
+ ret = bpf_perf_link_attach(attr, prog);
+ break;
+ case BPF_PROG_TYPE_KPROBE:
+ if (attr->link_create.attach_type == BPF_PERF_EVENT)
+ ret = bpf_perf_link_attach(attr, prog);
+ else if (attr->link_create.attach_type == BPF_TRACE_KPROBE_MULTI)
+ ret = bpf_kprobe_multi_link_attach(attr, prog);
+ else if (attr->link_create.attach_type == BPF_TRACE_UPROBE_MULTI)
+ ret = bpf_uprobe_multi_link_attach(attr, prog);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+out:
+ if (ret < 0)
+ bpf_prog_put(prog);
+ return ret;
+}
+
+static int link_update_map(struct bpf_link *link, union bpf_attr *attr)
+{
+ struct bpf_map *new_map, *old_map = NULL;
+ int ret;
+
+ new_map = bpf_map_get(attr->link_update.new_map_fd);
+ if (IS_ERR(new_map))
+ return PTR_ERR(new_map);
+
+ if (attr->link_update.flags & BPF_F_REPLACE) {
+ old_map = bpf_map_get(attr->link_update.old_map_fd);
+ if (IS_ERR(old_map)) {
+ ret = PTR_ERR(old_map);
+ goto out_put;
+ }
+ } else if (attr->link_update.old_map_fd) {
+ ret = -EINVAL;
+ goto out_put;
+ }
+
+ ret = link->ops->update_map(link, new_map, old_map);
+
+ if (old_map)
+ bpf_map_put(old_map);
+out_put:
+ bpf_map_put(new_map);
+ return ret;
+}
+
+#define BPF_LINK_UPDATE_LAST_FIELD link_update.old_prog_fd
+
+static int link_update(union bpf_attr *attr)
+{
+ struct bpf_prog *old_prog = NULL, *new_prog;
+ struct bpf_link *link;
+ u32 flags;
+ int ret;
+
+ if (CHECK_ATTR(BPF_LINK_UPDATE))
+ return -EINVAL;
+
+ flags = attr->link_update.flags;
+ if (flags & ~BPF_F_REPLACE)
+ return -EINVAL;
+
+ link = bpf_link_get_from_fd(attr->link_update.link_fd);
+ if (IS_ERR(link))
+ return PTR_ERR(link);
+
+ if (link->ops->update_map) {
+ ret = link_update_map(link, attr);
+ goto out_put_link;
+ }
+
+ new_prog = bpf_prog_get(attr->link_update.new_prog_fd);
+ if (IS_ERR(new_prog)) {
+ ret = PTR_ERR(new_prog);
+ goto out_put_link;
+ }
+
+ if (flags & BPF_F_REPLACE) {
+ old_prog = bpf_prog_get(attr->link_update.old_prog_fd);
+ if (IS_ERR(old_prog)) {
+ ret = PTR_ERR(old_prog);
+ old_prog = NULL;
+ goto out_put_progs;
+ }
+ } else if (attr->link_update.old_prog_fd) {
+ ret = -EINVAL;
+ goto out_put_progs;
+ }
+
+ if (link->ops->update_prog)
+ ret = link->ops->update_prog(link, new_prog, old_prog);
+ else
+ ret = -EINVAL;
+
+out_put_progs:
+ if (old_prog)
+ bpf_prog_put(old_prog);
+ if (ret)
+ bpf_prog_put(new_prog);
+out_put_link:
+ bpf_link_put_direct(link);
+ return ret;
+}
+
+#define BPF_LINK_DETACH_LAST_FIELD link_detach.link_fd
+
+static int link_detach(union bpf_attr *attr)
+{
+ struct bpf_link *link;
+ int ret;
+
+ if (CHECK_ATTR(BPF_LINK_DETACH))
+ return -EINVAL;
+
+ link = bpf_link_get_from_fd(attr->link_detach.link_fd);
+ if (IS_ERR(link))
+ return PTR_ERR(link);
+
+ if (link->ops->detach)
+ ret = link->ops->detach(link);
+ else
+ ret = -EOPNOTSUPP;
+
+ bpf_link_put_direct(link);
+ return ret;
+}
+
+static struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link)
+{
+ return atomic64_fetch_add_unless(&link->refcnt, 1, 0) ? link : ERR_PTR(-ENOENT);
+}
+
+struct bpf_link *bpf_link_by_id(u32 id)
+{
+ struct bpf_link *link;
+
+ if (!id)
+ return ERR_PTR(-ENOENT);
+
+ spin_lock_bh(&link_idr_lock);
+ /* before link is "settled", ID is 0, pretend it doesn't exist yet */
+ link = idr_find(&link_idr, id);
+ if (link) {
+ if (link->id)
+ link = bpf_link_inc_not_zero(link);
+ else
+ link = ERR_PTR(-EAGAIN);
+ } else {
+ link = ERR_PTR(-ENOENT);
+ }
+ spin_unlock_bh(&link_idr_lock);
+ return link;
+}
+
+struct bpf_link *bpf_link_get_curr_or_next(u32 *id)
+{
+ struct bpf_link *link;
+
+ spin_lock_bh(&link_idr_lock);
+again:
+ link = idr_get_next(&link_idr, id);
+ if (link) {
+ link = bpf_link_inc_not_zero(link);
+ if (IS_ERR(link)) {
+ (*id)++;
+ goto again;
+ }
+ }
+ spin_unlock_bh(&link_idr_lock);
+
+ return link;
+}
+
+#define BPF_LINK_GET_FD_BY_ID_LAST_FIELD link_id
+
+static int bpf_link_get_fd_by_id(const union bpf_attr *attr)
+{
+ struct bpf_link *link;
+ u32 id = attr->link_id;
+ int fd;
+
+ if (CHECK_ATTR(BPF_LINK_GET_FD_BY_ID))
+ return -EINVAL;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ link = bpf_link_by_id(id);
+ if (IS_ERR(link))
+ return PTR_ERR(link);
+
+ fd = bpf_link_new_fd(link);
+ if (fd < 0)
+ bpf_link_put_direct(link);
+
+ return fd;
+}
+
+DEFINE_MUTEX(bpf_stats_enabled_mutex);
+
+static int bpf_stats_release(struct inode *inode, struct file *file)
+{
+ mutex_lock(&bpf_stats_enabled_mutex);
+ static_key_slow_dec(&bpf_stats_enabled_key.key);
+ mutex_unlock(&bpf_stats_enabled_mutex);
+ return 0;
+}
+
+static const struct file_operations bpf_stats_fops = {
+ .release = bpf_stats_release,
+};
+
+static int bpf_enable_runtime_stats(void)
+{
+ int fd;
+
+ mutex_lock(&bpf_stats_enabled_mutex);
+
+ /* Set a very high limit to avoid overflow */
+ if (static_key_count(&bpf_stats_enabled_key.key) > INT_MAX / 2) {
+ mutex_unlock(&bpf_stats_enabled_mutex);
+ return -EBUSY;
+ }
+
+ fd = anon_inode_getfd("bpf-stats", &bpf_stats_fops, NULL, O_CLOEXEC);
+ if (fd >= 0)
+ static_key_slow_inc(&bpf_stats_enabled_key.key);
+
+ mutex_unlock(&bpf_stats_enabled_mutex);
+ return fd;
+}
+
+#define BPF_ENABLE_STATS_LAST_FIELD enable_stats.type
+
+static int bpf_enable_stats(union bpf_attr *attr)
+{
+
+ if (CHECK_ATTR(BPF_ENABLE_STATS))
+ return -EINVAL;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ switch (attr->enable_stats.type) {
+ case BPF_STATS_RUN_TIME:
+ return bpf_enable_runtime_stats();
+ default:
+ break;
+ }
+ return -EINVAL;
+}
+
+#define BPF_ITER_CREATE_LAST_FIELD iter_create.flags
+
+static int bpf_iter_create(union bpf_attr *attr)
+{
+ struct bpf_link *link;
+ int err;
+
+ if (CHECK_ATTR(BPF_ITER_CREATE))
+ return -EINVAL;
+
+ if (attr->iter_create.flags)
+ return -EINVAL;
+
+ link = bpf_link_get_from_fd(attr->iter_create.link_fd);
+ if (IS_ERR(link))
+ return PTR_ERR(link);
+
+ err = bpf_iter_new_fd(link);
+ bpf_link_put_direct(link);
+
+ return err;
+}
+
+#define BPF_PROG_BIND_MAP_LAST_FIELD prog_bind_map.flags
+
+static int bpf_prog_bind_map(union bpf_attr *attr)
+{
+ struct bpf_prog *prog;
+ struct bpf_map *map;
+ struct bpf_map **used_maps_old, **used_maps_new;
+ int i, ret = 0;
+
+ if (CHECK_ATTR(BPF_PROG_BIND_MAP))
+ return -EINVAL;
+
+ if (attr->prog_bind_map.flags)
+ return -EINVAL;
+
+ prog = bpf_prog_get(attr->prog_bind_map.prog_fd);
+ if (IS_ERR(prog))
+ return PTR_ERR(prog);
+
+ map = bpf_map_get(attr->prog_bind_map.map_fd);
+ if (IS_ERR(map)) {
+ ret = PTR_ERR(map);
+ goto out_prog_put;
+ }
+
+ mutex_lock(&prog->aux->used_maps_mutex);
+
+ used_maps_old = prog->aux->used_maps;
+
+ for (i = 0; i < prog->aux->used_map_cnt; i++)
+ if (used_maps_old[i] == map) {
+ bpf_map_put(map);
+ goto out_unlock;
+ }
+
+ used_maps_new = kmalloc_array(prog->aux->used_map_cnt + 1,
+ sizeof(used_maps_new[0]),
+ GFP_KERNEL);
+ if (!used_maps_new) {
+ ret = -ENOMEM;
+ goto out_unlock;
+ }
+
+ memcpy(used_maps_new, used_maps_old,
+ sizeof(used_maps_old[0]) * prog->aux->used_map_cnt);
+ used_maps_new[prog->aux->used_map_cnt] = map;
+
+ prog->aux->used_map_cnt++;
+ prog->aux->used_maps = used_maps_new;
+
+ kfree(used_maps_old);
+
+out_unlock:
+ mutex_unlock(&prog->aux->used_maps_mutex);
+
+ if (ret)
+ bpf_map_put(map);
+out_prog_put:
+ bpf_prog_put(prog);
+ return ret;
+}
+
+static int __sys_bpf(int cmd, bpfptr_t uattr, unsigned int size)
+{
+ union bpf_attr attr;
+ int err;
+
+ err = bpf_check_uarg_tail_zero(uattr, sizeof(attr), size);
+ if (err)
+ return err;
+ size = min_t(u32, size, sizeof(attr));
+
+ /* copy attributes from user space, may be less than sizeof(bpf_attr) */
+ memset(&attr, 0, sizeof(attr));
+ if (copy_from_bpfptr(&attr, uattr, size) != 0)
+ return -EFAULT;
+
+ err = security_bpf(cmd, &attr, size);
+ if (err < 0)
+ return err;
+
+ switch (cmd) {
+ case BPF_MAP_CREATE:
+ err = map_create(&attr);
+ break;
+ case BPF_MAP_LOOKUP_ELEM:
+ err = map_lookup_elem(&attr);
+ break;
+ case BPF_MAP_UPDATE_ELEM:
+ err = map_update_elem(&attr, uattr);
+ break;
+ case BPF_MAP_DELETE_ELEM:
+ err = map_delete_elem(&attr, uattr);
+ break;
+ case BPF_MAP_GET_NEXT_KEY:
+ err = map_get_next_key(&attr);
+ break;
+ case BPF_MAP_FREEZE:
+ err = map_freeze(&attr);
+ break;
+ case BPF_PROG_LOAD:
+ err = bpf_prog_load(&attr, uattr, size);
+ break;
+ case BPF_OBJ_PIN:
+ err = bpf_obj_pin(&attr);
+ break;
+ case BPF_OBJ_GET:
+ err = bpf_obj_get(&attr);
+ break;
+ case BPF_PROG_ATTACH:
+ err = bpf_prog_attach(&attr);
+ break;
+ case BPF_PROG_DETACH:
+ err = bpf_prog_detach(&attr);
+ break;
+ case BPF_PROG_QUERY:
+ err = bpf_prog_query(&attr, uattr.user);
+ break;
+ case BPF_PROG_TEST_RUN:
+ err = bpf_prog_test_run(&attr, uattr.user);
+ break;
+ case BPF_PROG_GET_NEXT_ID:
+ err = bpf_obj_get_next_id(&attr, uattr.user,
+ &prog_idr, &prog_idr_lock);
+ break;
+ case BPF_MAP_GET_NEXT_ID:
+ err = bpf_obj_get_next_id(&attr, uattr.user,
+ &map_idr, &map_idr_lock);
+ break;
+ case BPF_BTF_GET_NEXT_ID:
+ err = bpf_obj_get_next_id(&attr, uattr.user,
+ &btf_idr, &btf_idr_lock);
+ break;
+ case BPF_PROG_GET_FD_BY_ID:
+ err = bpf_prog_get_fd_by_id(&attr);
+ break;
+ case BPF_MAP_GET_FD_BY_ID:
+ err = bpf_map_get_fd_by_id(&attr);
+ break;
+ case BPF_OBJ_GET_INFO_BY_FD:
+ err = bpf_obj_get_info_by_fd(&attr, uattr.user);
+ break;
+ case BPF_RAW_TRACEPOINT_OPEN:
+ err = bpf_raw_tracepoint_open(&attr);
+ break;
+ case BPF_BTF_LOAD:
+ err = bpf_btf_load(&attr, uattr, size);
+ break;
+ case BPF_BTF_GET_FD_BY_ID:
+ err = bpf_btf_get_fd_by_id(&attr);
+ break;
+ case BPF_TASK_FD_QUERY:
+ err = bpf_task_fd_query(&attr, uattr.user);
+ break;
+ case BPF_MAP_LOOKUP_AND_DELETE_ELEM:
+ err = map_lookup_and_delete_elem(&attr);
+ break;
+ case BPF_MAP_LOOKUP_BATCH:
+ err = bpf_map_do_batch(&attr, uattr.user, BPF_MAP_LOOKUP_BATCH);
+ break;
+ case BPF_MAP_LOOKUP_AND_DELETE_BATCH:
+ err = bpf_map_do_batch(&attr, uattr.user,
+ BPF_MAP_LOOKUP_AND_DELETE_BATCH);
+ break;
+ case BPF_MAP_UPDATE_BATCH:
+ err = bpf_map_do_batch(&attr, uattr.user, BPF_MAP_UPDATE_BATCH);
+ break;
+ case BPF_MAP_DELETE_BATCH:
+ err = bpf_map_do_batch(&attr, uattr.user, BPF_MAP_DELETE_BATCH);
+ break;
+ case BPF_LINK_CREATE:
+ err = link_create(&attr, uattr);
+ break;
+ case BPF_LINK_UPDATE:
+ err = link_update(&attr);
+ break;
+ case BPF_LINK_GET_FD_BY_ID:
+ err = bpf_link_get_fd_by_id(&attr);
+ break;
+ case BPF_LINK_GET_NEXT_ID:
+ err = bpf_obj_get_next_id(&attr, uattr.user,
+ &link_idr, &link_idr_lock);
+ break;
+ case BPF_ENABLE_STATS:
+ err = bpf_enable_stats(&attr);
+ break;
+ case BPF_ITER_CREATE:
+ err = bpf_iter_create(&attr);
+ break;
+ case BPF_LINK_DETACH:
+ err = link_detach(&attr);
+ break;
+ case BPF_PROG_BIND_MAP:
+ err = bpf_prog_bind_map(&attr);
+ break;
+ default:
+ err = -EINVAL;
+ break;
+ }
+
+ return err;
+}
+
+SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, uattr, unsigned int, size)
+{
+ return __sys_bpf(cmd, USER_BPFPTR(uattr), size);
+}
+
+static bool syscall_prog_is_valid_access(int off, int size,
+ enum bpf_access_type type,
+ const struct bpf_prog *prog,
+ struct bpf_insn_access_aux *info)
+{
+ if (off < 0 || off >= U16_MAX)
+ return false;
+ if (off % size != 0)
+ return false;
+ return true;
+}
+
+BPF_CALL_3(bpf_sys_bpf, int, cmd, union bpf_attr *, attr, u32, attr_size)
+{
+ switch (cmd) {
+ case BPF_MAP_CREATE:
+ case BPF_MAP_DELETE_ELEM:
+ case BPF_MAP_UPDATE_ELEM:
+ case BPF_MAP_FREEZE:
+ case BPF_MAP_GET_FD_BY_ID:
+ case BPF_PROG_LOAD:
+ case BPF_BTF_LOAD:
+ case BPF_LINK_CREATE:
+ case BPF_RAW_TRACEPOINT_OPEN:
+ break;
+ default:
+ return -EINVAL;
+ }
+ return __sys_bpf(cmd, KERNEL_BPFPTR(attr), attr_size);
+}
+
+
+/* To shut up -Wmissing-prototypes.
+ * This function is used by the kernel light skeleton
+ * to load bpf programs when modules are loaded or during kernel boot.
+ * See tools/lib/bpf/skel_internal.h
+ */
+int kern_sys_bpf(int cmd, union bpf_attr *attr, unsigned int size);
+
+int kern_sys_bpf(int cmd, union bpf_attr *attr, unsigned int size)
+{
+ struct bpf_prog * __maybe_unused prog;
+ struct bpf_tramp_run_ctx __maybe_unused run_ctx;
+
+ switch (cmd) {
+#ifdef CONFIG_BPF_JIT /* __bpf_prog_enter_sleepable used by trampoline and JIT */
+ case BPF_PROG_TEST_RUN:
+ if (attr->test.data_in || attr->test.data_out ||
+ attr->test.ctx_out || attr->test.duration ||
+ attr->test.repeat || attr->test.flags)
+ return -EINVAL;
+
+ prog = bpf_prog_get_type(attr->test.prog_fd, BPF_PROG_TYPE_SYSCALL);
+ if (IS_ERR(prog))
+ return PTR_ERR(prog);
+
+ if (attr->test.ctx_size_in < prog->aux->max_ctx_offset ||
+ attr->test.ctx_size_in > U16_MAX) {
+ bpf_prog_put(prog);
+ return -EINVAL;
+ }
+
+ run_ctx.bpf_cookie = 0;
+ if (!__bpf_prog_enter_sleepable_recur(prog, &run_ctx)) {
+ /* recursion detected */
+ __bpf_prog_exit_sleepable_recur(prog, 0, &run_ctx);
+ bpf_prog_put(prog);
+ return -EBUSY;
+ }
+ attr->test.retval = bpf_prog_run(prog, (void *) (long) attr->test.ctx_in);
+ __bpf_prog_exit_sleepable_recur(prog, 0 /* bpf_prog_run does runtime stats */,
+ &run_ctx);
+ bpf_prog_put(prog);
+ return 0;
+#endif
+ default:
+ return ____bpf_sys_bpf(cmd, attr, size);
+ }
+}
+EXPORT_SYMBOL(kern_sys_bpf);
+
+static const struct bpf_func_proto bpf_sys_bpf_proto = {
+ .func = bpf_sys_bpf,
+ .gpl_only = false,
+ .ret_type = RET_INTEGER,
+ .arg1_type = ARG_ANYTHING,
+ .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY,
+ .arg3_type = ARG_CONST_SIZE,
+};
+
+const struct bpf_func_proto * __weak
+tracing_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
+{
+ return bpf_base_func_proto(func_id);
+}
+
+BPF_CALL_1(bpf_sys_close, u32, fd)
+{
+ /* When bpf program calls this helper there should not be
+ * an fdget() without matching completed fdput().
+ * This helper is allowed in the following callchain only:
+ * sys_bpf->prog_test_run->bpf_prog->bpf_sys_close
+ */
+ return close_fd(fd);
+}
+
+static const struct bpf_func_proto bpf_sys_close_proto = {
+ .func = bpf_sys_close,
+ .gpl_only = false,
+ .ret_type = RET_INTEGER,
+ .arg1_type = ARG_ANYTHING,
+};
+
+BPF_CALL_4(bpf_kallsyms_lookup_name, const char *, name, int, name_sz, int, flags, u64 *, res)
+{
+ if (flags)
+ return -EINVAL;
+
+ if (name_sz <= 1 || name[name_sz - 1])
+ return -EINVAL;
+
+ if (!bpf_dump_raw_ok(current_cred()))
+ return -EPERM;
+
+ *res = kallsyms_lookup_name(name);
+ return *res ? 0 : -ENOENT;
+}
+
+static const struct bpf_func_proto bpf_kallsyms_lookup_name_proto = {
+ .func = bpf_kallsyms_lookup_name,
+ .gpl_only = false,
+ .ret_type = RET_INTEGER,
+ .arg1_type = ARG_PTR_TO_MEM,
+ .arg2_type = ARG_CONST_SIZE_OR_ZERO,
+ .arg3_type = ARG_ANYTHING,
+ .arg4_type = ARG_PTR_TO_LONG,
+};
+
+static const struct bpf_func_proto *
+syscall_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
+{
+ switch (func_id) {
+ case BPF_FUNC_sys_bpf:
+ return !perfmon_capable() ? NULL : &bpf_sys_bpf_proto;
+ case BPF_FUNC_btf_find_by_name_kind:
+ return &bpf_btf_find_by_name_kind_proto;
+ case BPF_FUNC_sys_close:
+ return &bpf_sys_close_proto;
+ case BPF_FUNC_kallsyms_lookup_name:
+ return &bpf_kallsyms_lookup_name_proto;
+ default:
+ return tracing_prog_func_proto(func_id, prog);
+ }
+}
+
+const struct bpf_verifier_ops bpf_syscall_verifier_ops = {
+ .get_func_proto = syscall_prog_func_proto,
+ .is_valid_access = syscall_prog_is_valid_access,
+};
+
+const struct bpf_prog_ops bpf_syscall_prog_ops = {
+ .test_run = bpf_prog_test_run_syscall,
+};
+
+#ifdef CONFIG_SYSCTL
+static int bpf_stats_handler(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ struct static_key *key = (struct static_key *)table->data;
+ static int saved_val;
+ int val, ret;
+ struct ctl_table tmp = {
+ .data = &val,
+ .maxlen = sizeof(val),
+ .mode = table->mode,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE,
+ };
+
+ if (write && !capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ mutex_lock(&bpf_stats_enabled_mutex);
+ val = saved_val;
+ ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
+ if (write && !ret && val != saved_val) {
+ if (val)
+ static_key_slow_inc(key);
+ else
+ static_key_slow_dec(key);
+ saved_val = val;
+ }
+ mutex_unlock(&bpf_stats_enabled_mutex);
+ return ret;
+}
+
+void __weak unpriv_ebpf_notify(int new_state)
+{
+}
+
+static int bpf_unpriv_handler(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ int ret, unpriv_enable = *(int *)table->data;
+ bool locked_state = unpriv_enable == 1;
+ struct ctl_table tmp = *table;
+
+ if (write && !capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ tmp.data = &unpriv_enable;
+ ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
+ if (write && !ret) {
+ if (locked_state && unpriv_enable != 1)
+ return -EPERM;
+ *(int *)table->data = unpriv_enable;
+ }
+
+ if (write)
+ unpriv_ebpf_notify(unpriv_enable);
+
+ return ret;
+}
+
+static struct ctl_table bpf_syscall_table[] = {
+ {
+ .procname = "unprivileged_bpf_disabled",
+ .data = &sysctl_unprivileged_bpf_disabled,
+ .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
+ .mode = 0644,
+ .proc_handler = bpf_unpriv_handler,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_TWO,
+ },
+ {
+ .procname = "bpf_stats_enabled",
+ .data = &bpf_stats_enabled_key.key,
+ .mode = 0644,
+ .proc_handler = bpf_stats_handler,
+ },
+ { }
+};
+
+static int __init bpf_syscall_sysctl_init(void)
+{
+ register_sysctl_init("kernel", bpf_syscall_table);
+ return 0;
+}
+late_initcall(bpf_syscall_sysctl_init);
+#endif /* CONFIG_SYSCTL */