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: <20201117173811.lw4nwicoykhnn3tt@steredhat>
Date:   Tue, 17 Nov 2020 18:38:11 +0100
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Stefan Hajnoczi <stefanha@...hat.com>
Cc:     virtualization@...ts.linux-foundation.org,
        Laurent Vivier <lvivier@...hat.com>,
        linux-kernel@...r.kernel.org, Eli Cohen <elic@...dia.com>,
        Jason Wang <jasowang@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Max Gurtovoy <mgurtovoy@...dia.com>
Subject: Re: [PATCH RFC 04/12] vdpa: add vdpa simulator for block device

On Tue, Nov 17, 2020 at 04:43:42PM +0000, Stefan Hajnoczi wrote:
>On Tue, Nov 17, 2020 at 03:16:20PM +0100, Stefano Garzarella wrote:
>> On Tue, Nov 17, 2020 at 11:11:21AM +0000, Stefan Hajnoczi wrote:
>> > On Fri, Nov 13, 2020 at 02:47:04PM +0100, Stefano Garzarella wrote:
>> > > +static void vdpasim_blk_work(struct work_struct *work)
>> > > +{
>> > > +	struct vdpasim *vdpasim = container_of(work, struct vdpasim, work);
>> > > +	u8 status = VIRTIO_BLK_S_OK;
>> > > +	int i;
>> > > +
>> > > +	spin_lock(&vdpasim->lock);
>> > > +
>> > > +	if (!(vdpasim->status & VIRTIO_CONFIG_S_DRIVER_OK))
>> > > +		goto out;
>> > > +
>> > > +	for (i = 0; i < VDPASIM_BLK_VQ_NUM; i++) {
>> > > +		struct vdpasim_virtqueue *vq = &vdpasim->vqs[i];
>> > > +
>> > > +		if (!vq->ready)
>> > > +			continue;
>> > > +
>> > > +		while (vringh_getdesc_iotlb(&vq->vring, &vq->iov, &vq->iov,
>> > > +					    &vq->head, GFP_ATOMIC) > 0) {
>> > > +
>> > > +			int write;
>> > > +
>> > > +			vq->iov.i = vq->iov.used - 1;
>> > > +			write = vringh_iov_push_iotlb(&vq->vring, &vq->iov, &status, 1);
>> > > +			if (write <= 0)
>> > > +				break;
>> >
>> > We're lucky the guest driver doesn't crash after VIRTIO_BLK_T_GET_ID? :)
>>
>> The crash could happen if the simulator doesn't put the string terminator,
>> but in virtio_blk.c, the serial_show() initialize the buffer putting the
>> string terminator in the VIRTIO_BLK_ID_BYTES element:
>>
>>     buf[VIRTIO_BLK_ID_BYTES] = '\0';
>>     err = virtblk_get_id(disk, buf);
>>
>> This should prevent the issue, right?
>>
>> However in the last patch of this series I implemented VIRTIO_BLK_T_GET_ID
>> support :-)
>
>Windows, BSD, macOS, etc guest drivers aren't necessarily going to
>terminate or initialize the serial string buffer.

Unfortunately I discovered that VIRTIO_BLK_T_GET_ID is not in the VIRTIO 
specs, so, just for curiosity, I checked the QEMU code and I found this:

     case VIRTIO_BLK_T_GET_ID:
     {
         /*
          * NB: per existing s/n string convention the string is
          * terminated by '\0' only when shorter than buffer.
          */
         const char *serial = s->conf.serial ? s->conf.serial : "";
         size_t size = MIN(strlen(serial) + 1,
                           MIN(iov_size(in_iov, in_num),
                               VIRTIO_BLK_ID_BYTES));
         iov_from_buf(in_iov, in_num, 0, serial, size);
         virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
         virtio_blk_free_request(req);
         break;
     }

It seems that the device emulation in QEMU expects that the driver 
terminates the serial string buffer.

Do you know why VIRTIO_BLK_T_GET_ID is not in the specs?
Should we add it?

Thanks,
Stefano

>
>Anyway, the later patch that implements VIRTIO_BLK_T_GET_ID solves this
>issue! Thanks.

>
>Stefan


Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ