linux-kernel - [PATCH 39/43] userns: Convert sysctl permission checks to use kuid and kgids.

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Message-Id: <1333862139-31737-39-git-send-email-ebiederm@xmission.com>
Date:	Sat,  7 Apr 2012 22:15:35 -0700
From:	"\"Eric W. Beiderman" <ebiederm@...ssion.com>
To:	<linux-kernel@...r.kernel.org>
Cc:	<linux-fsdevel@...r.kernel.org>,
	<linux-security-module@...r.kernel.org>,
	Linux Containers <containers@...ts.linux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Al Viro <viro@...IV.linux.org.uk>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH 39/43] userns: Convert sysctl permission checks to use kuid and kgids.

From: Eric W. Biederman <ebiederm@...ssion.com>

Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
 fs/proc/proc_sysctl.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index 21d836f..3476bca 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -371,9 +371,9 @@ void register_sysctl_root(struct ctl_table_root *root)
 
 static int test_perm(int mode, int op)
 {
-	if (!current_euid())
+	if (uid_eq(current_euid(), GLOBAL_ROOT_UID))
 		mode >>= 6;
-	else if (in_egroup_p(0))
+	else if (in_egroup_p(GLOBAL_ROOT_GID))
 		mode >>= 3;
 	if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
 		return 0;
-- 
1.7.2.5

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