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

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Message-Id: <1371606834-5802-14-git-send-email-gaofeng@cn.fujitsu.com>
Date:	Wed, 19 Jun 2013 09:53:45 +0800
From:	Gao feng <gaofeng@...fujitsu.com>
To:	containers@...ts.linux-foundation.org, linux-audit@...hat.com,
	linux-kernel@...r.kernel.org
Cc:	eparis@...hat.com, serge.hallyn@...ntu.com, ebiederm@...ssion.com,
	sgrubb@...hat.com, aris@...hat.com, matthltc@...ux.vnet.ibm.com,
	Gao feng <gaofeng@...fujitsu.com>
Subject: [PATCH 13/22] Audit: only allow init user namespace to change rate limit

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@...fujitsu.com>
---
 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);
 }
 
-- 
1.8.1.4

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