linux-kernel - Re: [syzbot] WARNING in cow_file_range

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: <20221026081426.GP5824@twin.jikos.cz>
Date:   Wed, 26 Oct 2022 10:14:26 +0200
From:   David Sterba <dsterba@...e.cz>
To:     Johannes Thumshirn <Johannes.Thumshirn@....com>
Cc:     syzbot <syzbot+858534c396b0cdd291d2@...kaller.appspotmail.com>,
        "clm@...com" <clm@...com>, "dsterba@...e.com" <dsterba@...e.com>,
        "josef@...icpanda.com" <josef@...icpanda.com>,
        "linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "osandov@...com" <osandov@...com>,
        "sweettea-kernel@...miny.me" <sweettea-kernel@...miny.me>,
        "syzkaller-bugs@...glegroups.com" <syzkaller-bugs@...glegroups.com>
Subject: Re: [syzbot] WARNING in cow_file_range_inline

On Wed, Oct 26, 2022 at 07:30:02AM +0000, Johannes Thumshirn wrote:
> On 26.10.22 00:19, syzbot wrote:

> Not sure how applicable this is. The reproducer configures failslab to
> fail every 16th call and then complains about -ENOMEM ¯\_(ツ)_/¯

This still has some value I think, though we can't do much when an
ENOMEM is hit, at least from this report I see the way it's reported
back to user can be improved.

For EIO and EUCLEAN we don't dump the full stack trace because such
errors can happen during testing a lot, we may add ENOMEM as well. The
stack is supposed to be noisy for errors we want to know about, eg.
ENOSPC during transaction commit that would point to a bug in the
reservations.