netdev - Re: [PATCH] virtio: don't set VIRTIO_NET_HDR_F_DATA

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:   Tue, 17 Jan 2017 14:08:02 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     mst@...hat.com
Cc:     rolf.neugebauer@...ker.com, netdev@...r.kernel.org,
        jasowang@...hat.com, rppt@...ux.vnet.ibm.com
Subject: Re: [PATCH] virtio: don't set VIRTIO_NET_HDR_F_DATA_VALID on xmit

From: "Michael S. Tsirkin" <mst@...hat.com>
Date: Tue, 17 Jan 2017 20:27:33 +0200

> On Tue, Jan 17, 2017 at 06:13:51PM +0000, Rolf Neugebauer wrote:
>> This patch part reverts fd2a0437dc33 and e858fae2b0b8 which introduced a
>> subtle change in how the virtio_net flags are derived from the SKBs
>> ip_summed field.
>> 
>> With the above commits, the flags are set to VIRTIO_NET_HDR_F_DATA_VALID
>> when ip_summed == CHECKSUM_UNNECESSARY, thus treating it differently to
>> ip_summed == CHECKSUM_NONE, which should be the same.
>> 
>> Further, the virtio spec 1.0 / CS04 explicitly says that
>> VIRTIO_NET_HDR_F_DATA_VALID must not be set by the driver.
>> 
>> Signed-off-by: Rolf Neugebauer <rolf.neugebauer@...ker.com>
> 
> Fixes: fd2a0437dc33 ("virtio_net: introduce virtio_net_hdr_{from,to}_skb")
> Fixes: e858fae2b0b8 (" virtio_net: use common code for virtio_net_hdr and skb GSO conversion")
> Acked-by: Michael S. Tsirkin <mst@...hat.com>
> 
> Should be backported into stable as well.

Applied and queued up for -stable, thanks everyone.