linux-kernel - [PATCH 4.4 44/50] ovl: copy new uid/gid into overlayfs runtime inode

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Message-Id: <20160314175019.605944203@linuxfoundation.org>
Date:	Mon, 14 Mar 2016 10:51:02 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Konstantin Khlebnikov <koct9i@...il.com>,
	Miklos Szeredi <miklos@...redi.hu>
Subject: [PATCH 4.4 44/50] ovl: copy new uid/gid into overlayfs runtime inode

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

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

From: Konstantin Khlebnikov <koct9i@...il.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@...il.com>
Signed-off-by: Miklos Szeredi <miklos@...redi.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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);