linux-kernel - Re: [PATCH] 9p: fix Use-After-Free in p9_write

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Message-ID: <20180730060021.GA22926@nautica>
Date:   Mon, 30 Jul 2018 08:00:21 +0200
From:   Dominique Martinet <asmadeus@...ewreck.org>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Tomas Bortoli <tomasbortoli@...il.com>,
        David Miller <davem@...emloft.net>,
        v9fs-developer@...ts.sourceforge.net,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: [PATCH] 9p: fix Use-After-Free in p9_write_work()

Dmitry Vyukov wrote on Mon, Jul 30, 2018:
> On Mon, Jul 30, 2018 at 1:33 AM, Dominique Martinet
> <asmadeus@...ewreck.org> wrote:
> > Tomas Bortoli wrote on Sun, Jul 29, 2018:
> >> There is a race condition between p9_free_req() and p9_write_work().
> >> A request might still need to be processed while p9_free_req() is called.
> >>
> >> To fix it, flush the read/write work before freeing any request.
> >>
> >> Signed-off-by: Tomas Bortoli <tomasbortoli@...il.com>
> >> Reported-by: syzbot+467050c1ce275af2a5b8@...kaller.appspotmail.com
> >
> > It looks like I have not received this report, I found it through google
> > in the lkml archives
> 
> But you should have been received it? Or not?
> We had some complaints that syzbot emails were not delivered, but in
> these cases they were not delivered to lkml,  and only to explicitly
> CCed people.

I'm not on lkml and the archives I found do not list who were Cc'd that
I can see - it might have tried to send a copy to v9fs-developer that is
held up in the moderation queue for all I know :/

I'm not complaining I didn't get a copy (if I ever find time to work on
these, I can work through the list on the website) - I just need to know
how to find the report corresponding to patchs being sent.


> > but Dmitry do you have a convenient-ish way of
> > finding the report on the syzkaller website with that reported-by tag?
> 
> Well, you can do:
> http://syzkaller.appspot.com/bug?extid=467050c1ce275af2a5b8

Thanks, for some reason I only thought of bug?id= which didn't work,
this is perfect.


Cheers,
-- 
Dominique