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[bpf-next,v4,1/5] bpf, verifier: Correct tail_call_reachable when no tailcall in subprog

Message ID 20240509150541.81799-2-hffilwlqm@gmail.com (mailing list archive)
State New, archived
Delegated to: BPF
Headers show
Series bpf: Fix tailcall hierarchy | expand

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Commit Message

Leon Hwang May 9, 2024, 3:05 p.m. UTC 
When there is tailcall in main prog but there is no tailcall in its
subprogs, prog->aux->tail_call_reachable is incorrect for this case.

In order to correct it, it has to check subprog[0].has_tail_call at the
time when to check subprog[0].tail_call_reachable in
check_max_stack_depth_subprog().

It's for fixing a tailcall issue whose patch relies on
prog->aux->tail_call_reachable.

Signed-off-by: Leon Hwang <hffilwlqm@gmail.com>
---
 kernel/bpf/verifier.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 9e3aba08984e8..f874ee4b24486 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -6000,7 +6000,7 @@  static int check_max_stack_depth_subprog(struct bpf_verifier_env *env, int idx)
 			}
 			subprog[ret_prog[j]].tail_call_reachable = true;
 		}
-	if (subprog[0].tail_call_reachable)
+	if (subprog[0].tail_call_reachable || subprog[0].has_tail_call)
 		env->prog->aux->tail_call_reachable = true;
 
 	/* end of for() loop means the last insn of the 'subprog'