linux-kernel - Re: KASAN: use-after-free Read in btrfs_scan_one

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]

Message-ID: <20200930180522.GR6756@twin.jikos.cz>
Date:   Wed, 30 Sep 2020 20:05:22 +0200
From:   David Sterba <dsterba@...e.cz>
To:     dsterba@...e.cz,
        syzbot <syzbot+582e66e5edf36a22c7b0@...kaller.appspotmail.com>,
        clm@...com, dsterba@...e.com, josef@...icpanda.com,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Read in btrfs_scan_one_device

On Wed, Sep 30, 2020 at 06:57:56PM +0200, David Sterba wrote:
> On Sun, Sep 20, 2020 at 07:12:14AM -0700, syzbot wrote:
> > Hello,
> > 
> > syzbot found the following issue on:
> > 
> > HEAD commit:    eb5f95f1 Merge tag 's390-5.9-6' of git://git.kernel.org/pu..
> > git tree:       upstream
> > console output: https://syzkaller.appspot.com/x/log.txt?x=10a0a8bb900000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=ffe85b197a57c180
> > dashboard link: https://syzkaller.appspot.com/bug?extid=582e66e5edf36a22c7b0
> > compiler:       gcc (GCC) 10.1.0-syz 20200507
> > 
> > Unfortunately, I don't have any reproducer for this issue yet.
> > 
> > IMPORTANT: if you fix the issue, please add the following tag to the commit:
> > Reported-by: syzbot+582e66e5edf36a22c7b0@...kaller.appspotmail.com
> 
> #syz fix: btrfs: fix overflow when copying corrupt csums for a message

Johannes spotted that this is not the right fix for this report, I don't
know how to tell syzbot to revert the 'fix:' command, there isn't
'unfix' (like there's 'undup').