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

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Message-ID: <bd7b1d78bf38a1b8eb5fd13c96f54066ab0f507f.camel@fb.com>
Date:   Tue, 26 Jul 2022 08:43:11 +0000
From:   Dylan Yudaken <dylany@...com>
To:     "mail.dipanjan.das@...il.com" <mail.dipanjan.das@...il.com>
CC:     "fleischermarius@...glemail.com" <fleischermarius@...glemail.com>,
        "its.priyanka.bose@...il.com" <its.priyanka.bose@...il.com>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "io-uring@...r.kernel.org" <io-uring@...r.kernel.org>,
        "asml.silence@...il.com" <asml.silence@...il.com>,
        "syzkaller@...glegroups.com" <syzkaller@...glegroups.com>
Subject: Re: KASAN: use-after-free Read in __io_remove_buffers

On Mon, 2022-07-25 at 22:00 -0700, Dipanjan Das wrote:
> 
> > 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.
> 
> 

Great, thanks for confirming.