linux-kernel - Re: xattr hash error in 4.13-rc with overlayfs over ext4

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] [day] [month] [year] [list]

Message-ID: <CAAeU0aMZ12Ff5dghWwB=EWtNFSZz=iWaMBsP75pqYdypNpg8zA@mail.gmail.com>
Date:   Sun, 6 Aug 2017 13:05:41 -0700
From:   Tahsin Erdogan <tahsin@...gle.com>
To:     "zhangyi (F)" <yizhang089@...il.com>
Cc:     Miklos Szeredi <miklos@...redi.hu>,
        Amir Goldstein <amir73il@...il.com>,
        "Theodore Ts'o" <tytso@....edu>,
        "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "linux-unionfs@...r.kernel.org" <linux-unionfs@...r.kernel.org>
Subject: Re: xattr hash error in 4.13-rc with overlayfs over ext4

On Sun, Aug 6, 2017 at 5:47 AM, zhangyi (F) <yizhang089@...il.com> wrote:
> I think the root cause of this problem is the hash value not updated
> when we overwrite the same xattr, please see ext4_xattr_set_entry():

Yes, you are right. Thanks a lot for finding the root cause.

I just sent out a fix: ("[PATCH] ext4: add missing xattr hash update")

http://patchwork.ozlabs.org/patch/798445/