Re: [PATCH] virtio_ring: fix KMSAN error for premapped mode
From: Ilya Leoshkevich <iii@linux.ibm.com>
Date: 2024-06-06 11:55:03
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@linux.alibaba.com> Tested-by: Alexander Potapenko <glider@google.com> --- drivers/virtio/virtio_ring.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
Tested-by: Ilya Leoshkevich <iii@linux.ibm.com> # s390x Thanks!