linux-kernel - Re: [PATCH] fork: fix incorrect fput of ->exe

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Message-ID: <CAHmME9rBoJBQi8QRpAK-Vzc1hWnN_UasjUfaxtrioJy1mLxGKw@mail.gmail.com>
Date:   Thu, 16 Nov 2017 23:24:21 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Eric Biggers <ebiggers3@...il.com>
Cc:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Ingo Molnar <mingo@...nel.org>,
        Konstantin Khlebnikov <koct9i@...il.com>,
        Michal Hocko <mhocko@...e.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Eric Biggers <ebiggers@...gle.com>
Subject: Re: [PATCH] fork: fix incorrect fput of ->exe_file causing use-after-free

Hey Eric,

This is a pretty late response to the thread, but in case you're
curious, since Ubuntu forgot to backport this (I already emailed them
about it), I actually experienced a set of boxes that hit this bug in
the wild and were crashing every 2 weeks or so, when under highload.
It's pretty amazing that syzkaller unearthed this, resulting in a nice
test case, making it possible to debug and fix the error. Otherwise
it'd be a real heisenbug.

So, thanks.

Jason