linux-kernel - Re: [PATCH] vhost-vdpa: filter VIRTIO_F_RING

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] [day] [month] [year] [list]

Message-ID: <6culpnuswqq4fh7r5iqqtvwrpnsapn4jhx3heorfctztc2miem@hscigltkix5d>
Date:   Thu, 22 Jun 2023 14:28:11 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        Jason Wang <jasowang@...hat.com>,
        Eugenio Pérez <eperezma@...hat.com>,
        Tiwei Bie <tiwei.bie@...el.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vhost-vdpa: filter VIRTIO_F_RING_PACKED feature

On Thu, Jun 22, 2023 at 07:37:08AM -0400, Michael S. Tsirkin wrote:
>On Mon, Jun 05, 2023 at 01:06:44PM +0200, Stefano Garzarella wrote:
>> vhost-vdpa IOCTLs (eg. VHOST_GET_VRING_BASE, VHOST_SET_VRING_BASE)
>> don't support packed virtqueue well yet, so let's filter the
>> VIRTIO_F_RING_PACKED feature for now in vhost_vdpa_get_features().
>>
>> This way, even if the device supports it, we don't risk it being
>> negotiated, then the VMM is unable to set the vring state properly.
>>
>> Fixes: 4c8cf31885f6 ("vhost: introduce vDPA-based backend")
>> Cc: stable@...r.kernel.org
>> Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>
>
>OK so for now I dropped this, we have a better fix upstream.
>

Yep, I agree.

Maybe we can reuse this patch in the stable branches where the backport
is not easy. Although as Jason said, maybe we don't need it.

Thanks,
Stefano