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bpf: enforce precision of R0 on program/async callback return

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Given we enforce a valid range for program and async callback return
value, we must mark R0 as precise to avoid incorrect state pruning.

Fixes: b5dc0163d8 ("bpf: precise scalar_value tracking")
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20231202175705.885270-9-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko 2023-12-02 09:57:02 -08:00 committed by Alexei Starovoitov
parent 0ef24c8dfa
commit eabe518de5
1 changed files with 4 additions and 0 deletions
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4
kernel/bpf/verifier.c
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@ -15138,6 +15138,10 @@ static int check_return_code(struct bpf_verifier_env *env, int regno, const char
return -EINVAL;
}
err = mark_chain_precision(env, regno);
if (err)
return err;
if (!retval_range_within(range, reg)) {
verbose_invalid_scalar(env, reg, range, exit_ctx, reg_name);
if (!is_subprog &&