linux-kernel - [PATCH 11/43] userns: Start out with a full set of capabilities.

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Message-Id: <1333862139-31737-11-git-send-email-ebiederm@xmission.com>
Date:	Sat,  7 Apr 2012 22:15:07 -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 11/43] userns: Start out with a full set of capabilities.

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

Acked-by: Serge Hallyn <serge.hallyn@...onical.com>
Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
 kernel/user_namespace.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index c15e533..e216e1e 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -11,6 +11,7 @@
 #include <linux/user_namespace.h>
 #include <linux/highuid.h>
 #include <linux/cred.h>
+#include <linux/securebits.h>
 
 static struct kmem_cache *user_ns_cachep __read_mostly;
 
@@ -52,6 +53,14 @@ int create_user_ns(struct cred *new)
 	new->gid = new->egid = new->sgid = new->fsgid = 0;
 	put_group_info(new->group_info);
 	new->group_info = get_group_info(&init_groups);
+	/* Start with the same capabilities as init but useless for doing
+	 * anything as the capabilities are bound to the new user namespace.
+	 */
+	new->securebits = SECUREBITS_DEFAULT;
+	new->cap_inheritable = CAP_EMPTY_SET;
+	new->cap_permitted = CAP_FULL_SET;
+	new->cap_effective = CAP_FULL_SET;
+	new->cap_bset = CAP_FULL_SET;
 #ifdef CONFIG_KEYS
 	key_put(new->request_key_auth);
 	new->request_key_auth = NULL;
-- 
1.7.2.5

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