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

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Date:   Mon, 25 Jul 2022 22:00:30 -0700
From:   Dipanjan Das <mail.dipanjan.das@...il.com>
To:     Dylan Yudaken <dylany@...com>
Cc:     "io-uring@...r.kernel.org" <io-uring@...r.kernel.org>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "asml.silence@...il.com" <asml.silence@...il.com>,
        "fleischermarius@...glemail.com" <fleischermarius@...glemail.com>,
        "syzkaller@...glegroups.com" <syzkaller@...glegroups.com>,
        "its.priyanka.bose@...il.com" <its.priyanka.bose@...il.com>
Subject: Re: KASAN: use-after-free Read in __io_remove_buffers

> On Thu, Jul 21, 2022 at 4:06 AM Dylan Yudaken <dylany@...com> wrote:
> >
> > Both of the bug reports you sent seem to be fixed by the patch I just
> > sent.
> >
> > This one however does not seem to terminate once fixed. Is there an
> > expected run time?
>

We can confirm that the C-repro hangs while the syz-repro does not.
For the unpatched kernel, the repro triggers the bug in less than a
minute.


-- 
Thanks and Regards,

Dipanjan