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bpf: Add a verbose message when the BTF limit is reached

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When a BPF program which is being loaded reaches the map limit
(MAX_USED_MAPS) or the BTF limit (MAX_USED_BTFS) the -E2BIG is
returned. However, in the former case there is an accompanying
verifier verbose message, and in the latter case there is not.
Add a verbose message to make the behaviour symmetrical.

Reported-by: Kevin Sheldrake <kevin.sheldrake@isovalent.com>
Signed-off-by: Anton Protopopov <a.s.protopopov@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20250816151554.902995-1-a.s.protopopov@gmail.com
This commit is contained in:
Anton Protopopov 2025-08-16 15:15:54 +00:00 committed by Daniel Borkmann
parent d87fdb1f27
commit dbe99ea541
1 changed files with 4 additions and 1 deletions
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5
kernel/bpf/verifier.c
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@ -20193,8 +20193,11 @@ static int __add_used_btf(struct bpf_verifier_env *env, struct btf *btf)
if (env->used_btfs[i].btf == btf)
return i;
if (env->used_btf_cnt >= MAX_USED_BTFS)
if (env->used_btf_cnt >= MAX_USED_BTFS) {
verbose(env, "The total number of btfs per program has reached the limit of %u\n",
MAX_USED_BTFS);
return -E2BIG;
}
btf_get(btf);