[PATCH 13/22] Audit: only allow init user namespace to change rate limit

From: Gao feng
Date: Tue Jun 18 2013 - 21:57:40 EST

Because We want to avoid the DoS attack caused by other user
namespace,so don't make audit_rate_limit per user namespace.
And only init user namespace has rights to change it.

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 0b9cef2..306231d 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -295,6 +295,9 @@ static int audit_do_config_change(char *function_name, int *to_change, int new)

static int audit_set_rate_limit(int limit)
+ if (current_user_ns() != &init_user_ns)
+ return -EPERM;
return audit_do_config_change("audit_rate_limit", &audit_rate_limit, limit);


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