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bpf: Ignore verifier log reset in BPF_LOG_KERNEL mode

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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>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Lorenz Bauer <lmb@isovalent.com>
Link: https://lore.kernel.org/bpf/20230406234205.323208-8-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko 2023-04-06 16:41:53 -07:00 committed by Daniel Borkmann
parent b1a7a480a1
commit 24bc80887a
1 changed files with 1 additions and 1 deletions
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2
kernel/bpf/log.c
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@ -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,