linux-kernel - Re: [PATCH v4 1/5] vsock/virtio: limit the memory used per-socket

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]

Message-ID: <20190903074554.mq6spyivftuodahy@steredhat>
Date:   Tue, 3 Sep 2019 09:45:54 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Stefan Hajnoczi <stefanha@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        virtualization@...ts.linux-foundation.org,
        Jason Wang <jasowang@...hat.com>, kvm@...r.kernel.org
Subject: Re: [PATCH v4 1/5] vsock/virtio: limit the memory used per-socket

On Tue, Sep 03, 2019 at 12:39:19AM -0400, Michael S. Tsirkin wrote:
> On Mon, Sep 02, 2019 at 11:57:23AM +0200, Stefano Garzarella wrote:
> > > 
> > > Assuming we miss nothing and buffers < 4K are broken,
> > > I think we need to add this to the spec, possibly with
> > > a feature bit to relax the requirement that all buffers
> > > are at least 4k in size.
> > > 
> > 
> > Okay, should I send a proposal to virtio-dev@...ts.oasis-open.org?
> 
> How about we also fix the bug for now?

This series unintentionally fix the bug because we are introducing a way
to split the packet depending on the buffer size ([PATCH 4/5] vhost/vsock:
split packets to send using multiple buffers) and we removed the limit
to 4K buffers ([PATCH 5/5] vsock/virtio: change the maximum packet size
allowed).

I discovered that there was a bug while we discussed memory accounting.

Do you think it's enough while we introduce the feature bit in the spec?

Thanks,
Stefano