linux-kernel - [PATCH 3.14 070/158] nfsd: revert v2 half of "nfsd: dont return high mode bits"

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Message-Id: <20140504154039.436259543@linuxfoundation.org>
Date:	Sun,  4 May 2014 11:39:39 -0400
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Mark Lord <mlord@...ox.com>,
	Jeff Layton <jlayton@...hat.com>,
	"J. Bruce Fields" <bfields@...hat.com>,
	Johan Hovold <jhovold@...il.com>
Subject: [PATCH 3.14 070/158] nfsd: revert v2 half of "nfsd: dont return high mode bits"

3.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "J. Bruce Fields" <bfields@...hat.com>

commit 082f31a2169bd639785e45bf252f3d5bce0303c6 upstream.

This reverts the part of commit 6e14b46b91fee8a049b0940333ce13a820beaaa5
that changes NFSv2 behavior.

Mark Lord found that it broke nfs-root for Linux clients, because it
broke NFSv2.

In fact, from RFC 1094:

	"Notice that the file type is specified both in the mode bits
	and in the file type.  This is really a bug in the protocol and
	will be fixed in future versions."

So NFSv2 clients really are expected to depend on the high bits of the
mode.

Reported-by: Mark Lord <mlord@...ox.com>
Reviewed-by: Jeff Layton <jlayton@...hat.com>
Signed-off-by: J. Bruce Fields <bfields@...hat.com>
Cc: Johan Hovold <jhovold@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/nfsd/nfsxdr.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/nfsd/nfsxdr.c
+++ b/fs/nfsd/nfsxdr.c
@@ -152,7 +152,7 @@ encode_fattr(struct svc_rqst *rqstp, __b
 	type = (stat->mode & S_IFMT);

 	*p++ = htonl(nfs_ftypes[type >> 12]);
-	*p++ = htonl((u32) (stat->mode & S_IALLUGO));
+	*p++ = htonl((u32) stat->mode);
 	*p++ = htonl((u32) stat->nlink);
 	*p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
 	*p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));

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