Commit 24bc8088 authored by Andrii Nakryiko's avatar Andrii Nakryiko Committed by Daniel Borkmann
Browse files

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: default avatarAndrii Nakryiko <andrii@kernel.org>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarLorenz Bauer <lmb@isovalent.com>
Link: https://lore.kernel.org/bpf/20230406234205.323208-8-andrii@kernel.org
parent b1a7a480

kernel/bpf/log.c

+1 −1
Original line number Diff line number Diff line
@@ -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,