netdev - [PATCH RFC 14/48] Audit: only allow init user namespace to change audit

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Date:	Tue, 7 May 2013 10:20:35 +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 14/48] Audit: only allow init user namespace to change audit_failure

Setting audit_failure to AUDIT_FAIL_PANIC may
cause system panic.

We should disallow uninit user namesapce 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 8a3ea47..18cf5ce 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -345,6 +345,9 @@ static int audit_set_failure(int state, kuid_t loginuid, u32 sessionid, u32 sid)
 	    && state != AUDIT_FAIL_PANIC)
 		return -EINVAL;
 
+	if (current_user_ns() != &init_user_ns)
+		return -EPERM;
+
 	return audit_do_config_change("audit_failure", &audit_failure, state,
 				      loginuid, sessionid, sid);
 }
-- 
1.8.1.4

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