From: Frank Filz <ffilzlnx@us.ibm.com>
Date: Mon, 18 May 2009 21:41:40 +0000 (-0400)
Subject: nfs: Fix NFS v4 client handling of MAY_EXEC in nfs_permission.
X-Git-Tag: v2.6.27.25~59
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=218cadbd4ce2a81d417b6f7b5eb5d5460f221fec;p=thirdparty%2Fkernel%2Fstable.git

nfs: Fix NFS v4 client handling of MAY_EXEC in nfs_permission.

commit 7ee2cb7f32b299c2b06a31fde155457203e4b7dd upstream.

The problem is that permission checking is skipped if atomic open is
possible, but when exec opens a file, it just opens it O_READONLY which
means EXEC permission will not be checked at that time.

This problem is observed by the following sequence (executed as root):

  mount -t nfs4 server:/ /mnt4
  echo "ls" >/mnt4/foo
  chmod 744 /mnt4/foo
  su guest -c "mnt4/foo"

Signed-off-by: Frank Filz <ffilzlnx@us.ibm.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Tested-by: Eugene Teo <eugeneteo@kernel.sg>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index bff873311b40a..c3fe156dc462d 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -1925,7 +1925,8 @@ int nfs_permission(struct inode *inode, int mask)
 		case S_IFREG:
 			/* NFSv4 has atomic_open... */
 			if (nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN)
-					&& (mask & MAY_OPEN))
+					&& (mask & MAY_OPEN)
+					&& !(mask & MAY_EXEC))
 				goto out;
 			break;
 		case S_IFDIR: