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bpf: Allow return values 0 and 1 for kprobe session

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[ Upstream commit 17c4b65a24938c6dd79496cce5df15f70d9c253c ]

The kprobe session program can return only 0 or 1,
instruct verifier to check for that.

Fixes: 535a3692ba ("bpf: Add support for kprobe session attach")
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20241108134544.480660-2-jolsa@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jiri Olsa
2024-11-08 14:45:32 +01:00
committed by Greg Kroah-Hartman
parent fa6813b110
commit 36ede57f0c
1 changed files with 9 additions and 0 deletions
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9
kernel/bpf/verifier.c
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@@ -15988,6 +15988,15 @@ static int check_return_code(struct bpf_verifier_env *env, int regno, const char
return -ENOTSUPP;
}
break;
case BPF_PROG_TYPE_KPROBE:
switch (env->prog->expected_attach_type) {
case BPF_TRACE_KPROBE_SESSION:
range = retval_range(0, 1);
break;
default:
return 0;
}
break;
case BPF_PROG_TYPE_SK_LOOKUP:
range = retval_range(SK_DROP, SK_PASS);
break;