From: Alexei Starovoitov <ast@xxxxxxxxxx>
Since hash map is now converted to bpf_mem_alloc and it's waiting for rcu and
rcu_tasks_trace GPs before freeing elements into global memory slabs it's safe
to use dynamically allocated hash maps in sleepable bpf programs.
Acked-by: Kumar Kartikeya Dwivedi <memxor@xxxxxxxxx>
Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx>
---
kernel/bpf/verifier.c | 23 -----------------------
1 file changed, 23 deletions(-)
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 57ec06b1d09d..068b20ed34d2 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -12586,14 +12586,6 @@ static int check_pseudo_btf_id(struct bpf_verifier_env *env,
return err;
}
-static int check_map_prealloc(struct bpf_map *map)
-{
- return (map->map_type != BPF_MAP_TYPE_HASH &&
- map->map_type != BPF_MAP_TYPE_PERCPU_HASH &&
- map->map_type != BPF_MAP_TYPE_HASH_OF_MAPS) ||
- !(map->map_flags & BPF_F_NO_PREALLOC);
-}
-
static bool is_tracing_prog_type(enum bpf_prog_type type)
{
switch (type) {
@@ -12608,15 +12600,6 @@ static bool is_tracing_prog_type(enum bpf_prog_type type)
}
}
-static bool is_preallocated_map(struct bpf_map *map)
-{
- if (!check_map_prealloc(map))
- return false;
- if (map->inner_map_meta && !check_map_prealloc(map->inner_map_meta))
- return false;
- return true;
-}
-
static int check_map_prog_compatibility(struct bpf_verifier_env *env,
struct bpf_map *map,
struct bpf_prog *prog)
@@ -12669,12 +12652,6 @@ static int check_map_prog_compatibility(struct bpf_verifier_env *env,
case BPF_MAP_TYPE_LRU_PERCPU_HASH:
case BPF_MAP_TYPE_ARRAY_OF_MAPS:
case BPF_MAP_TYPE_HASH_OF_MAPS:
- if (!is_preallocated_map(map)) {
- verbose(env,
- "Sleepable programs can only use preallocated maps\n");
- return -EINVAL;
- }
- break;
case BPF_MAP_TYPE_RINGBUF:
case BPF_MAP_TYPE_INODE_STORAGE:
case BPF_MAP_TYPE_SK_STORAGE:
--
2.30.2
