linux-kernel - Re: [PATCH] virtio_net: fix use after free

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 17 Oct 2014 12:20:11 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	David Miller <davem@...emloft.net>
Cc:	linux-kernel@...r.kernel.org, rusty@...tcorp.com.au,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	jasowang@...hat.com
Subject: Re: [PATCH] virtio_net: fix use after free

On Wed, Oct 15, 2014 at 04:47:27PM -0400, David Miller wrote:
> From: "Michael S. Tsirkin" <mst@...hat.com>
> Date: Wed, 15 Oct 2014 16:23:28 +0300
> 
> > You used __netif_subqueue_stopped but that seems to use
> > a slightly more expensive test_bit internally.
> 
> More expensive in what sense?  It should be roughly the same
> as "x & y" sans the volatile.

I really just meant volatile - this might prevent some compiler
optimizations. I have't actually checked the produced binary so
I don't know for sure.

> Anyways I'm ambivalent and I want to see this bug fixes, so I'll
> apply your patch.
> 
> Thanks!
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/