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bpf: print full verifier states on infinite loop detection

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commit b4d8239534 upstream.

Additional logging in is_state_visited(): if infinite loop is detected
print full verifier state for both current and equivalent states.

Acked-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20231024000917.12153-8-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eduard Zingerman 2023-10-24 03:09:17 +03:00 committed by Greg Kroah-Hartman
parent 00808be797
commit ae5e9c3ced
1 changed files with 4 additions and 0 deletions
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4
kernel/bpf/verifier.c
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@ -16540,6 +16540,10 @@ static int is_state_visited(struct bpf_verifier_env *env, int insn_idx)
!iter_active_depths_differ(&sl->state, cur)) {
verbose_linfo(env, insn_idx, "; ");
verbose(env, "infinite loop detected at insn %d\n", insn_idx);
verbose(env, "cur state:");
print_verifier_state(env, cur->frame[cur->curframe], true);
verbose(env, "old state:");
print_verifier_state(env, sl->state.frame[cur->curframe], true);
return -EINVAL;
}
/* if the verifier is processing a loop, avoid adding new state