linux-kernel - [PATCH 31/43] userns: Teach inode_capable to understand inodes whose uids map to other namespaces.

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Message-Id: <1333862139-31737-31-git-send-email-ebiederm@xmission.com>
Date:	Sat,  7 Apr 2012 22:15:27 -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 31/43] userns: Teach inode_capable to understand inodes whose uids map to other namespaces.

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

Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
 kernel/capability.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/kernel/capability.c b/kernel/capability.c
index cc5f071..493d972 100644
--- a/kernel/capability.c
+++ b/kernel/capability.c
@@ -429,12 +429,14 @@ bool nsown_capable(int cap)
  * targeted at it's own user namespace and that the given inode is owned
  * by the current user namespace or a child namespace.
  *
- * Currently inodes can only be owned by the initial user namespace.
+ * Currently we check to see if an inode is owned by the current
+ * user namespace by seeing if the inode's owner maps into the
+ * current user namespace.
  *
  */
 bool inode_capable(const struct inode *inode, int cap)
 {
 	struct user_namespace *ns = current_user_ns();
 
-	return ns_capable(ns, cap) && (ns == &init_user_ns);
+	return ns_capable(ns, cap) && kuid_has_mapping(ns, inode->i_uid);
 }
-- 
1.7.2.5

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