linux-kernel - Re: slab-out-of-bounds in iov_iter

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: <20200911235511.GB3421308@ZenIV.linux.org.uk>
Date:   Sat, 12 Sep 2020 00:55:11 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Qian Cai <cai@....pw>
Cc:     torvalds@...ux-foundation.org, vgoyal@...hat.com,
        miklos@...redi.hu, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: slab-out-of-bounds in iov_iter_revert()

On Fri, Sep 11, 2020 at 05:59:04PM -0400, Qian Cai wrote:
> Super easy to reproduce on today's mainline by just fuzzing for a few minutes
> on virtiofs (if it ever matters). Any thoughts?

Usually happens when ->direct_IO() fucks up and reports the wrong amount
of data written/read.  We had several bugs like that in the past - see
e.g. 85128b2be673 (fix nfs O_DIRECT advancing iov_iter too much).

Had there been any recent O_DIRECT-related patches on the filesystems
involved?