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

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Date:   Thu, 27 Jun 2019 06:52:25 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     syzbot <syzbot+b75afdbe271a0d7ac4f6@...kaller.appspotmail.com>
Cc:     darrick.wong@...cle.com, linux-kernel@...r.kernel.org,
        linux-xfs@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Read in xlog_alloc_log

On Thu, Jun 27, 2019 at 04:06:54AM -0700, Christoph Hellwig wrote:
> It seems like this is the xlog_alloc_log error path.  We didn't
> really change anything in the circular ioclogs queue handling, so
> maybe thish has been there before, but xfs_buf wasn't wired up to
> kasan to catch it?
> 
> Either way I suspect the right thing to do is to replace the list
> with an array based lookup.  I'll look into that, maybe a reproducer
> appears until then.

Actually, the iclog allocations are obviously too small.  A patch will
be on its way soon.