linux-kernel - Re: [PATCH] aio: fix a use after free (and fix freeze protection of aio writes)

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Date:   Mon, 17 Oct 2016 22:04:57 +0200
From:   Christoph Hellwig <hch@....de>
To:     Jeff Moyer <jmoyer@...hat.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Christoph Hellwig <hch@....de>, viro@...iv.linux.org.uk,
        jack@...e.cz, dmonakhov@...nvz.org, linux-fsdevel@...r.kernel.org,
        linux-aio@...ck.org, linux-kernel@...r.kernel.org,
        Oleg Nesterov <oleg@...hat.com>,
        Mikulas Patocka <mpatocka@...hat.com>
Subject: Re: [PATCH] aio: fix a use after free (and fix freeze protection
        of aio writes)

On Mon, Oct 17, 2016 at 04:04:00PM -0400, Jeff Moyer wrote:
> >> Could we just change percpu_rw_semaphore->read_count to be a signed
> >> integer?  The down_write path sums up the counters from all cpus...
> >
> > To what point?
> 
> Duh, nevermind.  You're right, it should work as-is.

Ok, thanks.  That also explains why I didn't see any splat in
xfstests..