linux-kernel - [PATCH 01/43] vfs: Don't allow a user namespace root to make device nodes

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Message-Id: <1333862139-31737-1-git-send-email-ebiederm@xmission.com>
Date:	Sat,  7 Apr 2012 22:14:57 -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 01/43] vfs: Don't allow a user namespace root to make device nodes

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

Safely making device nodes in a container is solvable but simply
having the capability in a user namespace is not sufficient to make
this work.

Acked-by: Serge Hallyn <serge.hallyn@...onical.com>
Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
 fs/namei.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index 1898198..701954d 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2560,8 +2560,7 @@ int vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
 	if (error)
 		return error;
 
-	if ((S_ISCHR(mode) || S_ISBLK(mode)) &&
-	    !ns_capable(inode_userns(dir), CAP_MKNOD))
+	if ((S_ISCHR(mode) || S_ISBLK(mode)) && !capable(CAP_MKNOD))
 		return -EPERM;
 
 	if (!dir->i_op->mknod)
-- 
1.7.2.5

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