On Tue, Mar 14, 2023 at 04:39:00PM +0800, Xuan Zhuo wrote:
> Because headroom is not passed to page_to_skb(), this causes the shinfo
> exceeds the range. Then the frags of shinfo are changed by other process.
>
> [ 157.724634] stack segment: 0000 [#1] PREEMPT SMP NOPTI
> [ 157.725358] CPU: 3 PID: 679 Comm: xdp_pass_user_f Tainted: G E 6.2.0+ #150
> [ 157.726401] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/4
> [ 157.727820] RIP: 0010:skb_release_data+0x11b/0x180
> [ 157.728449] Code: 44 24 02 48 83 c3 01 39 d8 7e be 48 89 d8 48 c1 e0 04 41 80 7d 7e 00 49 8b 6c 04 30 79 0c 48 89 ef e8 89 b
> [ 157.730751] RSP: 0018:ffffc90000178b48 EFLAGS: 00010202
> [ 157.731383] RAX: 0000000000000010 RBX: 0000000000000001 RCX: 0000000000000000
> [ 157.732270] RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff888100dd0b00
> [ 157.733117] RBP: 5d5d76010f6e2408 R08: ffff888100dd0b2c R09: 0000000000000000
> [ 157.734013] R10: ffffffff82effd30 R11: 000000000000a14e R12: ffff88810981ffc0
> [ 157.734904] R13: ffff888100dd0b00 R14: 0000000000000002 R15: 0000000000002310
> [ 157.735793] FS: 00007f06121d9740(0000) GS:ffff88842fcc0000(0000) knlGS:0000000000000000
> [ 157.736794] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 157.737522] CR2: 00007ffd9a56c084 CR3: 0000000104bda001 CR4: 0000000000770ee0
> [ 157.738420] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 157.739283] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [ 157.740146] PKRU: 55555554
> [ 157.740502] Call Trace:
> [ 157.740843] <IRQ>
> [ 157.741117] kfree_skb_reason+0x50/0x120
> [ 157.741613] __udp4_lib_rcv+0x52b/0x5e0
> [ 157.742132] ip_protocol_deliver_rcu+0xaf/0x190
> [ 157.742715] ip_local_deliver_finish+0x77/0xa0
> [ 157.743280] ip_sublist_rcv_finish+0x80/0x90
> [ 157.743834] ip_list_rcv_finish.constprop.0+0x16f/0x190
> [ 157.744493] ip_list_rcv+0x126/0x140
> [ 157.744952] __netif_receive_skb_list_core+0x29b/0x2c0
> [ 157.745602] __netif_receive_skb_list+0xed/0x160
> [ 157.746190] ? udp4_gro_receive+0x275/0x350
> [ 157.746732] netif_receive_skb_list_internal+0xf2/0x1b0
> [ 157.747398] napi_gro_receive+0xd1/0x210
> [ 157.747911] virtnet_receive+0x75/0x1c0
> [ 157.748422] virtnet_poll+0x48/0x1b0
> [ 157.748878] __napi_poll+0x29/0x1b0
> [ 157.749330] net_rx_action+0x27a/0x340
> [ 157.749812] __do_softirq+0xf3/0x2fb
> [ 157.750298] do_softirq+0xa2/0xd0
> [ 157.750745] </IRQ>
> [ 157.751563] <TASK>
> [ 157.752329] __local_bh_enable_ip+0x6d/0x80
> [ 157.753178] virtnet_xdp_set+0x482/0x860
> [ 157.754159] ? __pfx_virtnet_xdp+0x10/0x10
> [ 157.755129] dev_xdp_install+0xa4/0xe0
> [ 157.756033] dev_xdp_attach+0x20b/0x5e0
> [ 157.756933] do_setlink+0x82e/0xc90
> [ 157.757777] ? __nla_validate_parse+0x12b/0x1e0
> [ 157.758744] rtnl_setlink+0xd8/0x170
> [ 157.759549] ? mod_objcg_state+0xcb/0x320
> [ 157.760328] ? security_capable+0x37/0x60
> [ 157.761209] ? security_capable+0x37/0x60
> [ 157.762072] rtnetlink_rcv_msg+0x145/0x3d0
> [ 157.762929] ? ___slab_alloc+0x327/0x610
> [ 157.763754] ? __alloc_skb+0x141/0x170
> [ 157.764533] ? __pfx_rtnetlink_rcv_msg+0x10/0x10
> [ 157.765422] netlink_rcv_skb+0x58/0x110
> [ 157.766229] netlink_unicast+0x21f/0x330
> [ 157.766951] netlink_sendmsg+0x240/0x4a0
> [ 157.767654] sock_sendmsg+0x93/0xa0
> [ 157.768434] ? sockfd_lookup_light+0x12/0x70
> [ 157.769245] __sys_sendto+0xfe/0x170
> [ 157.770079] ? handle_mm_fault+0xe9/0x2d0
> [ 157.770859] ? preempt_count_add+0x51/0xa0
> [ 157.771645] ? up_read+0x3c/0x80
> [ 157.772340] ? do_user_addr_fault+0x1e9/0x710
> [ 157.773166] ? kvm_read_and_reset_apf_flags+0x49/0x60
> [ 157.774087] __x64_sys_sendto+0x29/0x30
> [ 157.774856] do_syscall_64+0x3c/0x90
> [ 157.775518] entry_SYSCALL_64_after_hwframe+0x72/0xdc
> [ 157.776382] RIP: 0033:0x7f06122def70
>
> Fixes: 18117a842ab0 ("virtio-net: remove xdp related info from page_to_skb()")
> Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
> ---
> drivers/net/virtio_net.c | 11 ++++++-----
> 1 file changed, 6 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 1a309cfb4976..8ecf7a341d54 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -446,7 +446,8 @@ static unsigned int mergeable_ctx_to_truesize(void *mrg_ctx)
> static struct sk_buff *page_to_skb(struct virtnet_info *vi,
> struct receive_queue *rq,
> struct page *page, unsigned int offset,
> - unsigned int len, unsigned int truesize)
> + unsigned int len, unsigned int truesize,
> + unsigned int headroom)
> {
> struct sk_buff *skb;
> struct virtio_net_hdr_mrg_rxbuf *hdr;
> @@ -464,11 +465,11 @@ static struct sk_buff *page_to_skb(struct virtnet_info *vi,
> else
> hdr_padded_len = sizeof(struct padded_vnet_hdr);
>
> - buf = p;
> + buf = p - headroom;
> len -= hdr_len;
> offset += hdr_padded_len;
> p += hdr_padded_len;
> - tailroom = truesize - hdr_padded_len - len;
> + tailroom = truesize - headroom - hdr_padded_len - len;
>
> shinfo_size = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
>
> @@ -1009,7 +1010,7 @@ static struct sk_buff *receive_big(struct net_device *dev,
> {
> struct page *page = buf;
> struct sk_buff *skb =
> - page_to_skb(vi, rq, page, 0, len, PAGE_SIZE);
> + page_to_skb(vi, rq, page, 0, len, PAGE_SIZE, 0);
>
> stats->bytes += len - vi->hdr_len;
> if (unlikely(!skb))
> @@ -1332,7 +1333,7 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
> rcu_read_unlock();
>
> skip_xdp:
> - head_skb = page_to_skb(vi, rq, page, offset, len, truesize);
> + head_skb = page_to_skb(vi, rq, page, offset, len, truesize, headroom);
> curr_skb = head_skb;
>
> if (unlikely(!curr_skb))
> --
> 2.32.0.3.g01195cf9f
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