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Re: [Qemu-devel] [PATCH 0/2] virtio len fixes for qemu.
From: |
Rusty Russell |
Subject: |
Re: [Qemu-devel] [PATCH 0/2] virtio len fixes for qemu. |
Date: |
Thu, 12 Mar 2015 11:34:35 +1030 |
User-agent: |
Notmuch/0.17 (http://notmuchmail.org) Emacs/24.3.1 (x86_64-pc-linux-gnu) |
"Michael S. Tsirkin" <address@hidden> writes:
> On Wed, Mar 11, 2015 at 10:06:40PM +1030, Rusty Russell wrote:
>> Each entry in the ring is a pair: \field{id} indicates the head
>> entry of the descriptor chain describing the buffer (this
>> matches an entry placed in the available ring by the guest
>> earlier), and \field{len} the total of bytes written into the
>> buffer. The latter is extremely useful for drivers using
>> untrusted buffers: if you do not know exactly how much has been
>> written by the device, you usually have to zero the buffer to
>> ensure no data leakage occurs.
>
> Right so what does this "if you do not know exactly how much has been
> written by the device" mean?
It means "without this feature, you would not know how much has been
written by the device"...
Should probably become a Note:
Cheers,
Rusty.
- [Qemu-devel] [PATCH 0/2] virtio len fixes for qemu., Rusty Russell, 2015/03/11
- [Qemu-devel] [PATCH 1/2] virtio: make it clear that "len" for a used descriptor is len written., Rusty Russell, 2015/03/11
- [Qemu-devel] [PATCH 2/2] virtio-blk: fix length calculations for write operations., Rusty Russell, 2015/03/11
- Re: [Qemu-devel] [PATCH 0/2] virtio len fixes for qemu., Michael S. Tsirkin, 2015/03/11
- Re: [Qemu-devel] [PATCH 0/2] virtio len fixes for qemu., Fam Zheng, 2015/03/11
- Re: [Qemu-devel] [PATCH 0/2] virtio len fixes for qemu., Michael S. Tsirkin, 2015/03/11
- Re: [Qemu-devel] [PATCH 0/2] virtio len fixes for qemu., Rusty Russell, 2015/03/11
- Re: [Qemu-devel] [PATCH 0/2] virtio len fixes for qemu., Michael S. Tsirkin, 2015/03/11
- Re: [Qemu-devel] [PATCH 0/2] virtio len fixes for qemu.,
Rusty Russell <=
- Re: [Qemu-devel] [PATCH 0/2] virtio len fixes for qemu., Michael S. Tsirkin, 2015/03/12
- Re: [Qemu-devel] [PATCH 0/2] virtio len fixes for qemu., Rusty Russell, 2015/03/12
- Re: [Qemu-devel] [PATCH 0/2] virtio len fixes for qemu., Michael S. Tsirkin, 2015/03/13
- Re: [Qemu-devel] [PATCH 0/2] virtio len fixes for qemu., Rusty Russell, 2015/03/15
- Re: [Qemu-devel] [PATCH 0/2] virtio len fixes for qemu., Michael S. Tsirkin, 2015/03/16
- Re: [Qemu-devel] [PATCH 0/2] virtio len fixes for qemu., Cornelia Huck, 2015/03/16
- Re: [Qemu-devel] [PATCH 0/2] virtio len fixes for qemu., Rusty Russell, 2015/03/19
Re: [Qemu-devel] [PATCH 0/2] virtio len fixes for qemu., Michael S. Tsirkin, 2015/03/18