Re: [PATCH] virtio_ring: fix KMSAN error for premapped mode

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On Thu, 2024-06-06 at 19:13 +0800, Xuan Zhuo wrote:
> Add kmsan for virtqueue_dma_map_single_attrs to fix:
> 
> BUG: KMSAN: uninit-value in receive_buf+0x45ca/0x6990
>  receive_buf+0x45ca/0x6990
>  virtnet_poll+0x17e0/0x3130
>  net_rx_action+0x832/0x26e0
>  handle_softirqs+0x330/0x10f0
>  [...]
> 
> Uninit was created at:
>  __alloc_pages_noprof+0x62a/0xe60
>  alloc_pages_noprof+0x392/0x830
>  skb_page_frag_refill+0x21a/0x5c0
>  virtnet_rq_alloc+0x50/0x1500
>  try_fill_recv+0x372/0x54c0
>  virtnet_open+0x210/0xbe0
>  __dev_open+0x56e/0x920
>  __dev_change_flags+0x39c/0x2000
>  dev_change_flags+0xaa/0x200
>  do_setlink+0x197a/0x7420
>  rtnl_setlink+0x77c/0x860
>  [...]
> 
> Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
> Tested-by: Alexander Potapenko <glider@xxxxxxxxxx>
> ---
>  drivers/virtio/virtio_ring.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)

Tested-by: Ilya Leoshkevich <iii@xxxxxxxxxxxxx>  # s390x

Thanks!





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