diff options
| author | Alexei Starovoitov <ast@kernel.org> | 2024-06-20 19:48:29 -0700 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2024-06-20 19:48:29 -0700 |
| commit | 3b06304370931f90cd6f50ea9dd55603429b13dc (patch) | |
| tree | bc2ef689e85ff2ba195560840d0171d8e3629887 /kernel/bpf | |
| parent | f6afdaf72af7583d251bd569ded8d7d1eeb849c2 (diff) | |
| parent | f663a03c8e35c5156bad073a4a8f5e673d656e3f (diff) | |
Merge branch 'bpf-verifier-correct-tail_call_reachable-for-bpf-prog'
Leon Hwang says:
====================
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.
Therefore, it's unnecessary to detect tail call in x86 jit. Let's remove
it.
Changes:
v1 -> v2:
* Address comment from Yonghong:
* Remove unnecessary tail call detection in x86 jit.
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
---
Links:
[0] https://github.com/osandov/drgn
====================
Link: https://lore.kernel.org/r/20240610124224.34673-1-hffilwlqm@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'kernel/bpf')
| -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; |