linux-kernel - Re: [PATCH 0/2] virtio_net: fix race in RX VQ processing

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 for Android: free password hash cracker in your pocket

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

Message-ID: <51DB80B1.60009@redhat.com>
Date:	Tue, 09 Jul 2013 11:17:05 +0800
From:	Jason Wang <jasowang@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
CC:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH 0/2] virtio_net: fix race in RX VQ processing

On 07/08/2013 05:05 PM, Michael S. Tsirkin wrote:
> Jason Wang reported a race in RX VQ processing:
> virtqueue_enable_cb is called outside napi lock,
> violating virtio serialization rules.
> The race has been there from day 1, but it got especially nasty in 3.0
> when commit a5c262c5fd83ece01bd649fb08416c501d4c59d7
> "virtio_ring: support event idx feature"
> added more dependency on vq state.
>
> Please review, and consider for 3.11 and for stable.
>
> Jason, could you please report whether this fixes the issues for you?

Yes, I confirm this fixes the issue.

Since I can only reproduce it by adding udelay in virtqueue_enable_cb()
after virtio_mb(). I validate this also with this.

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/