From: Andrii Nakryiko Date: Thu, 6 Apr 2023 23:41:53 +0000 (-0700) Subject: bpf: Ignore verifier log reset in BPF_LOG_KERNEL mode X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=24bc80887adb4d6fc0057d4f14fabeaa4502b2a0;p=linux.git bpf: Ignore verifier log reset in BPF_LOG_KERNEL mode 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 Signed-off-by: Daniel Borkmann Acked-by: Lorenz Bauer Link: https://lore.kernel.org/bpf/20230406234205.323208-8-andrii@kernel.org --- diff --git a/kernel/bpf/log.c b/kernel/bpf/log.c index 92b1c8ad6601e..d99a50f07187d 100644 --- a/kernel/bpf/log.c +++ b/kernel/bpf/log.c @@ -106,7 +106,7 @@ void bpf_vlog_reset(struct bpf_verifier_log *log, u64 new_pos) if (WARN_ON_ONCE(new_pos > log->end_pos)) return; - 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,