[PATCH] audit: don't create audit log when audit_backlog_limit is zero

As the man page of auditctl said: " -b backlog Set max number of outstanding audit buffers allowed (Kernel Default=64) If all buffers are full, the failure flag is consulted by the kernel for action. " So if audit_backlog_limit is zero, it means no audit buffer should be allocated. Signed-off-by: Gao feng <gaofeng(a)cn.fujitsu.com&gt; --- kernel/audit.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/kernel/audit.c b/kernel/audit.c index 7b0e23a..bbb4000 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -1104,14 +1104,16 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, if (unlikely(audit_filter_type(type))) return NULL; + if (!audit_backlog_limit) + return NULL; + if (gfp_mask & __GFP_WAIT) reserve = 0; else reserve = 5; /* Allow atomic callers to go up to five entries over the normal backlog limit */ - while (audit_backlog_limit - && skb_queue_len(&audit_skb_queue) > audit_backlog_limit + reserve) { + while (skb_queue_len(&audit_skb_queue) > audit_backlog_limit + reserve) { if (gfp_mask & __GFP_WAIT && audit_backlog_wait_time) { unsigned long sleep_time; -- 1.8.3.1