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bpf, verifier: Correct tail_call_reachable for bpf prog

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BugLink: https://bugs.launchpad.net/bugs/2085849

[ 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@gmail.com>
Link: https://lore.kernel.org/r/20240610124224.34673-2-hffilwlqm@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com>
Signed-off-by: Roxana Nicolescu <roxana.nicolescu@canonical.com>
This commit is contained in:
Leon Hwang
2024-06-10 20:42:23 +08:00
committed by Mehmet Basaran
parent 580ae545b5
commit 16864a69bd
1 changed files with 3 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
kernel/bpf/verifier.c
+3 -1
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@@ -2941,8 +2941,10 @@ 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;