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| author |   Leon Hwang <hffilwlqm@gmail.com> | 2024-06-10 20:42:23 +0800 |
|---|---|---|
| committer |   Alexei Starovoitov <ast@kernel.org> | 2024-06-20 19:48:29 -0700 |
| commit | 01793ed86b5d7df1e956520b5474940743eb7ed8 (patch) | |
| tree | 5bb94d5dd2a14c8b1eae910e77505e039c80880a | |
| parent | Merge branch 'bpf-support-resilient-split-btf' (diff) | |
| download | wireguard-linux-01793ed86b5d7df1e956520b5474940743eb7ed8.tar.xz wireguard-linux-01793ed86b5d7df1e956520b5474940743eb7ed8.zip | |
bpf, verifier: Correct tail_call_reachable for bpf prog
It's confusing to inspect 'prog->aux->tail_call_reachable' with drgn[0],
when bpf prog has tail call but 'tail_call_reachable' is false.
This patch corrects 'tail_call_reachable' when bpf prog has tail call.
Signed-off-by: Leon Hwang <hffilwlqm@gmail.com>
Link: https://lore.kernel.org/r/20240610124224.34673-2-hffilwlqm@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
| -rw-r--r-- | kernel/bpf/verifier.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index dcbbf5f64c5d..ffe98a788c33 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -2982,8 +2982,10 @@ static int check_subprogs(struct bpf_verifier_env *env) if (code == (BPF_JMP | BPF_CALL) && insn[i].src_reg == 0 && - insn[i].imm == BPF_FUNC_tail_call) + insn[i].imm == BPF_FUNC_tail_call) { subprog[cur_subprog].has_tail_call = true; + subprog[cur_subprog].tail_call_reachable = true; + } if (BPF_CLASS(code) == BPF_LD && (BPF_MODE(code) == BPF_ABS || BPF_MODE(code) == BPF_IND)) subprog[cur_subprog].has_ld_abs = true; |