linux-kernel - Re: [PATCH] 9p: fix NULL pointer dereferences

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Message-ID: <20180726102540.GA25114@nautica>
Date:   Thu, 26 Jul 2018 12:25:40 +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 NULL pointer dereferences

Dmitry Vyukov wrote on Thu, Jul 26, 2018:
> On Thu, Jul 26, 2018 at 11:48 AM, Dominique Martinet
> <asmadeus@...ewreck.org> wrote:
> > I'm really curious if anyone ever uses the unix/fd variants for "real"
> > stuff though! (not meaning syzbot isn't real, but I have yet to see
> > anything take advantage of this, even if I could imagine some fun
> > applications by piping the wmii libixp server socket.. and just crashed
> > my laptop trying because of the (fixed) trans put bug.. I have yet to
> > see anyone actually doing this)
> 
> I don't really know any real-world cases, but 9p over fd it looks like
> a kind of fuse, so perhaps somebody uses it this way.

I guess, who knows...

> Also, fd allows to use something like sctp socket, and if I am not
> mistaken, trans=tcp can't even do ipv6 tcp (?).

Yeah... I have a server that supposedly supports it (nfs-ganesha) so
it's been on my todo list forever, but frankly I don't know many more
people using tcp either...

I'd like to at least get this done for rdma eventually but we're stuck
with ipv4 for Lustre anyway so this hasn't really been a priority, even
if either of the transports are likely a few lines "fix" to make them
support both protocols.

-- 
Dominique Martinet