Re: [Qemu-devel] [PATCH v3 for-4.0 2/7] vhost-user: Support providing shared memory to backend

[Yongji Xie]

On Fri, 4 Jan 2019 at 01:13, Michael S. Tsirkin <address@hidden> wrote:
>
> On Thu, Jan 03, 2019 at 06:18:14PM +0800, address@hidden wrote:
> > From: Xie Yongji <address@hidden>
> >
> > This patch introduces two new messages VHOST_USER_GET_SHM_SIZE
> > and VHOST_USER_SET_SHM_FD to support providing shared
> > memory to backend.
> >
> > Firstly, qemu uses VHOST_USER_GET_SHM_SIZE to get the
> > required size of shared memory from backend. Then, qemu
> > allocates memory and sends them back to backend through
> > VHOST_USER_SET_SHM_FD.
>
> So this does create a security concern that remote
> can supply a very big area.
> How about returning a buffer from client to qemu?
>

That's a good idea! Will do it v4.

Thanks,
Yongji