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@xxxxxxxxxx> --- kernel/bpf/log.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/bpf/log.c b/kernel/bpf/log.c index c931cf73f9fd..38b0f9e6d98d 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, -- 2.34.1
