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bpf: add support for bpf_spin_lock to cgroup local storage 

Allow 'struct bpf_spin_lock' to reside inside cgroup local storage.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Alexei Starovoitov 2019-01-31 15:40:05 -08:00 committed by Daniel Borkmann
parent d83525ca62
commit e16d2f1ab9
3 changed files with 6 additions and 1 deletions
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2
kernel/bpf/local_storage.c
View File

@ -147,6 +147,7 @@ static int cgroup_storage_update_elem(struct bpf_map *map, void *_key,
return -ENOMEM;
memcpy(&new->data[0], value, map->value_size);
check_and_init_map_lock(map, new->data);
new = xchg(&storage->buf, new);
kfree_rcu(new, rcu);
@ -483,6 +484,7 @@ struct bpf_cgroup_storage *bpf_cgroup_storage_alloc(struct bpf_prog *prog,
storage->buf = kmalloc_node(size, flags, map->numa_node);
if (!storage->buf)
goto enomem;
check_and_init_map_lock(map, storage->buf->data);
} else {
storage->percpu_buf = __alloc_percpu_gfp(size, 8, flags);
if (!storage->percpu_buf)

3
kernel/bpf/syscall.c
View File

@ -482,7 +482,8 @@ static int map_check_btf(struct bpf_map *map, const struct btf *btf,
if (map_value_has_spin_lock(map)) {
if (map->map_type != BPF_MAP_TYPE_HASH &&
map->map_type != BPF_MAP_TYPE_ARRAY)
map->map_type != BPF_MAP_TYPE_ARRAY &&
map->map_type != BPF_MAP_TYPE_CGROUP_STORAGE)
return -ENOTSUPP;
if (map->spin_lock_off + sizeof(struct bpf_spin_lock) >
map->value_size) {

2
kernel/bpf/verifier.c
View File

@ -3089,6 +3089,8 @@ static int check_helper_call(struct bpf_verifier_env *env, int func_id, int insn
regs[BPF_REG_0].map_ptr = meta.map_ptr;
if (fn->ret_type == RET_PTR_TO_MAP_VALUE) {
regs[BPF_REG_0].type = PTR_TO_MAP_VALUE;
if (map_value_has_spin_lock(meta.map_ptr))
regs[BPF_REG_0].id = ++env->id_gen;
} else {
regs[BPF_REG_0].type = PTR_TO_MAP_VALUE_OR_NULL;
regs[BPF_REG_0].id = ++env->id_gen;