6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Leon Hwang <hffilwlqm@xxxxxxxxx> [ Upstream commit 01793ed86b5d7df1e956520b5474940743eb7ed8 ] 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@xxxxxxxxx> Link: https://lore.kernel.org/r/20240610124224.34673-2-hffilwlqm@xxxxxxxxx Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- kernel/bpf/verifier.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 3f1a9cd7fc9e..9d5699942273 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -3064,8 +3064,10 @@ 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; -- 2.43.0
