Patch "afs: Adjust mode bits processing" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

afs: Adjust mode bits processing

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
afs-adjust-mode-bits-processing.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Marc Dionne <[email protected]>
Date: Thu, 16 Mar 2017 16:27:44 +0000
Subject: afs: Adjust mode bits processing

From: Marc Dionne <[email protected]>

[ Upstream commit 627f46943ff90bcc32ddeb675d881c043c6fa2ae ]

Mode bits for an afs file should not be enforced in the usual way.

For files, the absence of user bits can restrict file access with respect to what is granted by the server.

These bits apply regardless of the owner or the current uid; the rest of the mode bits (group, other) are ignored.

---
 fs/afs/security.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

@@ -340,17 +340,22 @@ int afs_permission(struct inode *inode,
 	} else {
 		if (!(access & AFS_ACE_LOOKUP))
 			goto permission_denied;
+		if ((mask & MAY_EXEC) && !(inode->i_mode & S_IXUSR))
+			goto permission_denied;
 		if (mask & (MAY_EXEC | MAY_READ)) {
 			if (!(access & AFS_ACE_READ))
 				goto permission_denied;
+			if (!(inode->i_mode & S_IRUSR))
+				goto permission_denied;
 		} else if (mask & MAY_WRITE) {
 			if (!(access & AFS_ACE_WRITE))
 				goto permission_denied;
+			if (!(inode->i_mode & S_IWUSR))
+				goto permission_denied;
 		}
 	}
 
 	key_put(key);
-	ret = generic_permission(inode, mask);
 	_leave(" = %d", ret);
 	return ret;
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/afs-populate-group-id-from-vnode-status.patch queue-4.4/afs-adjust-mode-bits-processing.patch queue-4.4/afs-populate-and-use-client-modification-time.patch