[PATCH 15/22] Audit: only allow init user namespace to change backlog_limit

[Gao feng]

Prevent un-init user namespace from generating lots of skb.

Signed-off-by: Gao feng <gaofeng@xxxxxxxxxxxxxx>
---
 kernel/audit.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/audit.c b/kernel/audit.c
index 79a8b8e..297ac6e 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -303,6 +303,9 @@ static int audit_set_rate_limit(int limit)
 
 static int audit_set_backlog_limit(int limit)
 {
+	if (current_user_ns() != &init_user_ns)
+		return -EPERM;
+
 	return audit_do_config_change("audit_backlog_limit", &audit_backlog_limit, limit);
 }
 
-- 
1.8.1.4

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