From: Anton Protopopov Date: Sat, 16 Aug 2025 15:15:54 +0000 (+0000) Subject: bpf: Add a verbose message when the BTF limit is reached X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=dbe99ea541f023d73abf5730c1477ba96111ef83;p=thirdparty%2Fkernel%2Fstable.git bpf: Add a verbose message when the BTF limit is reached 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 Signed-off-by: Anton Protopopov Signed-off-by: Daniel Borkmann Acked-by: Daniel Borkmann Link: https://lore.kernel.org/bpf/20250816151554.902995-1-a.s.protopopov@gmail.com --- diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 3a3982fe20d48..07cc4a738c678 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -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);