linux-kernel - [PATCH 4.19 048/205] ovl: check whiteout in ovl_create_over

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 19 Nov 2018 17:25:55 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Miklos Szeredi <mszeredi@...hat.com>
Subject: [PATCH 4.19 048/205] ovl: check whiteout in ovl_create_over_whiteout()

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

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

From: Miklos Szeredi <mszeredi@...hat.com>

commit 5e1275808630ea3b2c97c776f40e475017535f72 upstream.

Kaixuxia repors that it's possible to crash overlayfs by removing the
whiteout on the upper layer before creating a directory over it.  This is a
reproducer:

 mkdir lower upper work merge
 touch lower/file
 mount -t overlay overlay -olowerdir=lower,upperdir=upper,workdir=work merge
 rm merge/file
 ls -al merge/file
 rm upper/file
 ls -al merge/
 mkdir merge/file

Before commencing with a vfs_rename(..., RENAME_EXCHANGE) verify that the
lookup of "upper" is positive and is a whiteout, and return ESTALE
otherwise.

Reported by: kaixuxia <xiakaixu1987@...il.com>
Signed-off-by: Miklos Szeredi <mszeredi@...hat.com>
Fixes: e9be9d5e76e3 ("overlay filesystem")
Cc: <stable@...r.kernel.org> # v3.18
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/overlayfs/dir.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/fs/overlayfs/dir.c
+++ b/fs/overlayfs/dir.c
@@ -463,6 +463,10 @@ static int ovl_create_over_whiteout(stru
 	if (IS_ERR(upper))
 		goto out_unlock;
 
+	err = -ESTALE;
+	if (d_is_negative(upper) || !IS_WHITEOUT(d_inode(upper)))
+		goto out_dput;
+
 	newdentry = ovl_create_temp(workdir, cattr);
 	err = PTR_ERR(newdentry);
 	if (IS_ERR(newdentry))