linux-kernel - [PATCH RFC 13/48] Audit: only allow init user namespace to change audit_rate

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Message-Id: <1367893269-9308-14-git-send-email-gaofeng@cn.fujitsu.com>
Date:	Tue, 7 May 2013 10:20:34 +0800
From:	Gao feng <gaofeng@...fujitsu.com>
To:	viro@...iv.linux.org.uk, eparis@...hat.com, ebiederm@...ssion.com,
	sgrubb@...hat.com, akpm@...ux-foundation.org,
	serge.hallyn@...ntu.com, davem@...emloft.net
Cc:	netdev@...r.kernel.org, containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, linux-audit@...hat.com,
	Gao feng <gaofeng@...fujitsu.com>
Subject: [PATCH RFC 13/48] Audit: only allow init user namespace to change audit_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 bf8b59c..8a3ea47 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -308,6 +308,9 @@ static int audit_do_config_change(char *function_name, int *to_change,
 static int audit_set_rate_limit(int limit, kuid_t loginuid, u32 sessionid,
 				u32 sid)
 {
+	if (current_user_ns() != &init_user_ns)
+		return -EPERM;
+
 	return audit_do_config_change("audit_rate_limit", &audit_rate_limit,
 				      limit, loginuid, sessionid, sid);
 }
-- 
1.8.1.4

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