Patch "ovl: copy new uid/gid into overlayfs runtime inode" has been added to the 4.4-stable tree

Patch "ovl: copy new uid/gid into overlayfs runtime inode" has been added to the 4.4-stable tree

[gregkh]

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

    ovl: copy new uid/gid into overlayfs runtime inode

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:
     ovl-copy-new-uid-gid-into-overlayfs-runtime-inode.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 <stable@vger.kernel.org> know about it.


>From b81de061fa59f17d2730aabb1b84419ef3913810 Mon Sep 17 00:00:00 2001
From: Konstantin Khlebnikov <koct9i@gmail.com>
Date: Sun, 31 Jan 2016 16:21:29 +0300
Subject: ovl: copy new uid/gid into overlayfs runtime inode

From: Konstantin Khlebnikov <koct9i@gmail.com>

commit b81de061fa59f17d2730aabb1b84419ef3913810 upstream.

Overlayfs must update uid/gid after chown, otherwise functions
like inode_owner_or_capable() will check user against stale uid.
Catched by xfstests generic/087, it chowns file and calls utimes.

Signed-off-by: Konstantin Khlebnikov <koct9i@gmail.com>
Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/overlayfs/inode.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -65,6 +65,8 @@ int ovl_setattr(struct dentry *dentry, s
 
 		mutex_lock(&upperdentry->d_inode->i_mutex);
 		err = notify_change(upperdentry, attr, NULL);
+		if (!err)
+			ovl_copyattr(upperdentry->d_inode, dentry->d_inode);
 		mutex_unlock(&upperdentry->d_inode->i_mutex);
 	}
 	ovl_drop_write(dentry);


Patches currently in stable-queue which might be from koct9i@gmail.com are

queue-4.4/ovl-ignore-lower-entries-when-checking-purity-of-non-directory-entries.patch
queue-4.4/ovl-copy-new-uid-gid-into-overlayfs-runtime-inode.patch
queue-4.4/ovl-fix-working-on-distributed-fs-as-lower-layer.patch
queue-4.4/ovl-fix-getcwd-failure-after-unsuccessful-rmdir.patch