diff mbox series

[bpf-next,1/8] bpf: ignore verifier log reset in BPF_LOG_KERNEL mode

Message ID 20230330041642.1118787-2-andrii@kernel.org (mailing list archive)
State Not Applicable
Delegated to: BPF
Headers show
Series Teach verifier to determine necessary log buffer size | expand

Checks

Context Check Description
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/apply fail Patch does not apply to bpf-next
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Commit Message

Andrii Nakryiko March 30, 2023, 4:16 a.m. UTC 
Verifier log position reset is meaningless in BPF_LOG_KERNEL mode, so
just exit early in bpf_vlog_reset() if log->level is BPF_LOG_KERNEL.

This avoid meaningless put_user() into NULL log->ubuf.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
---
 kernel/bpf/log.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/kernel/bpf/log.c b/kernel/bpf/log.c
index beab7c7f52a7..0bcc0c5ce697 100644
--- a/kernel/bpf/log.c
+++ b/kernel/bpf/log.c
@@ -104,7 +104,7 @@  void bpf_vlog_reset(struct bpf_verifier_log *log, u64 new_pos)
 	char zero = 0;
 	u32 pos;
 
-	if (!bpf_verifier_log_needed(log))
+	if (!bpf_verifier_log_needed(log) || log->level == BPF_LOG_KERNEL)
 		return;
 
 	/* if position to which we reset is beyond current log window,