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bpf: clarify a misleading verifier error message

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The current verifier error message states that tail_calls are not
allowed in non-JITed programs with BPF-to-BPF calls. While this is
accurate, it is not the only scenario where this restriction applies.
Some architectures do not support this feature combination even when
programs are JITed. This update improves the error message to better
reflect these limitations.

Suggested-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
Signed-off-by: Andrea Terzolo <andreaterzolo3@gmail.com>
Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
Link: https://lore.kernel.org/r/20250318083551.8192-1-andreaterzolo3@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrea Terzolo 2025-03-18 09:35:45 +01:00 committed by Alexei Starovoitov
parent 6ca21620b4
commit a2598045ea
1 changed files with 1 additions and 1 deletions
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kernel/bpf/verifier.c
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@ -9887,7 +9887,7 @@ static int check_map_func_compatibility(struct bpf_verifier_env *env,
if (map->map_type != BPF_MAP_TYPE_PROG_ARRAY) if (map->map_type != BPF_MAP_TYPE_PROG_ARRAY)
goto error; goto error;
if (env->subprog_cnt > 1 && !allow_tail_call_in_subprogs(env)) { if (env->subprog_cnt > 1 && !allow_tail_call_in_subprogs(env)) {
verbose(env, "tail_calls are not allowed in non-JITed programs with bpf-to-bpf calls\n"); verbose(env, "mixing of tail_calls and bpf-to-bpf calls is not supported\n");
return -EINVAL; return -EINVAL;
} }
break; break;