linux-kernel - [PATCH 5/9] syslog_ns: make permisiion check per user namespace

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Date:	Mon, 29 Jul 2013 10:31:16 +0800
From:	Rui Xiang <rui.xiang@...wei.com>
To:	<containers@...ts.linux-foundation.org>,
	<linux-kernel@...r.kernel.org>
CC:	<serge.hallyn@...ntu.com>, <ebiederm@...ssion.com>,
	<akpm@...ux-foundation.org>, <gaofeng@...fujitsu.com>,
	<libo.chen@...wei.com>, Rui Xiang <rui.xiang@...wei.com>
Subject: [PATCH 5/9] syslog_ns: make permisiion check per user namespace

Use ns_capable to check capability in user ns,
instead of capable function. The user ns is the
owner of current syslog ns.

Signed-off-by: Rui Xiang <rui.xiang@...wei.com>
---
 kernel/printk.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/printk.c b/kernel/printk.c
index 846fef5..c5c65a8 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -380,13 +380,13 @@ static int check_syslog_permissions(int type, bool from_file,
 		return 0;
 
 	if (syslog_action_restricted(type, ns)) {
-		if (capable(CAP_SYSLOG))
+		if (ns_capable(ns->owner, CAP_SYSLOG))
 			return 0;
 		/*
 		 * For historical reasons, accept CAP_SYS_ADMIN too, with
 		 * a warning.
 		 */
-		if (capable(CAP_SYS_ADMIN)) {
+		if (ns_capable(ns->owner, CAP_SYS_ADMIN)) {
 			pr_warn_once("%s (%d): Attempt to access syslog with "
 				     "CAP_SYS_ADMIN but no CAP_SYSLOG "
 				     "(deprecated).\n",
-- 
1.8.2.2


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