[lvc-project] [PATCH v2] net: missing check virtio

[Jiri Pirko]

Thu, Jun 13, 2024 at 11:54:48AM CEST, arefev at swemel.ru wrote:
>Two missing check in virtio_net_hdr_to_skb() allowed syzbot
>to crash kernels again
>
>1. After the skb_segment function the buffer may become non-linear
>(nr_frags != 0), but since the SKBTX_SHARED_FRAG flag is not set anywhere
>the __skb_linearize function will not be executed, then the buffer will
>remain non-linear. Then the condition (offset >= skb_headlen(skb))
>becomes true, which causes WARN_ON_ONCE in skb_checksum_help.
>
>2. The struct sk_buff and struct virtio_net_hdr members must be
>mathematically related.
>(gso_size) must be greater than (needed) otherwise WARN_ON_ONCE.
>(remainder) must be greater than (needed) otherwise WARN_ON_ONCE.
>(remainder) may be 0 if division is without remainder.
>
>offset+2 (4191) > skb_headlen() (1116)
>WARNING: CPU: 1 PID: 5084 at net/core/dev.c:3303 skb_checksum_help+0x5e2/0x740 net/core/dev.c:3303
>Modules linked in:
>CPU: 1 PID: 5084 Comm: syz-executor336 Not tainted 6.7.0-rc3-syzkaller-00014-gdf60cee26a2e #0
>Hardware name: Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
>RIP: 0010:skb_checksum_help+0x5e2/0x740 net/core/dev.c:3303
>Code: 89 e8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 52 01 00 00 44 89 e2 2b 53 74 4c 89 ee 48 c7 c7 40 57 e9 8b e8 af 8f dd f8 90 <0f> 0b 90 90 e9 87 fe ff ff e8 40 0f 6e f9 e9 4b fa ff ff 48 89 ef
>RSP: 0018:ffffc90003a9f338 EFLAGS: 00010286
>RAX: 0000000000000000 RBX: ffff888025125780 RCX: ffffffff814db209
>RDX: ffff888015393b80 RSI: ffffffff814db216 RDI: 0000000000000001
>RBP: ffff8880251257f4 R08: 0000000000000001 R09: 0000000000000000
>R10: 0000000000000000 R11: 0000000000000001 R12: 000000000000045c
>R13: 000000000000105f R14: ffff8880251257f0 R15: 000000000000105d
>FS:  0000555555c24380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
>CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>CR2: 000000002000f000 CR3: 0000000023151000 CR4: 00000000003506f0
>DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>Call Trace:
> <TASK>
> ip_do_fragment+0xa1b/0x18b0 net/ipv4/ip_output.c:777
> ip_fragment.constprop.0+0x161/0x230 net/ipv4/ip_output.c:584
> ip_finish_output_gso net/ipv4/ip_output.c:286 [inline]
> __ip_finish_output net/ipv4/ip_output.c:308 [inline]
> __ip_finish_output+0x49c/0x650 net/ipv4/ip_output.c:295
> ip_finish_output+0x31/0x310 net/ipv4/ip_output.c:323
> NF_HOOK_COND include/linux/netfilter.h:303 [inline]
> ip_output+0x13b/0x2a0 net/ipv4/ip_output.c:433
> dst_output include/net/dst.h:451 [inline]
> ip_local_out+0xaf/0x1a0 net/ipv4/ip_output.c:129
> iptunnel_xmit+0x5b4/0x9b0 net/ipv4/ip_tunnel_core.c:82
> ipip6_tunnel_xmit net/ipv6/sit.c:1034 [inline]
> sit_tunnel_xmit+0xed2/0x28f0 net/ipv6/sit.c:1076
> __netdev_start_xmit include/linux/netdevice.h:4940 [inline]
> netdev_start_xmit include/linux/netdevice.h:4954 [inline]
> xmit_one net/core/dev.c:3545 [inline]
> dev_hard_start_xmit+0x13d/0x6d0 net/core/dev.c:3561
> __dev_queue_xmit+0x7c1/0x3d60 net/core/dev.c:4346
> dev_queue_xmit include/linux/netdevice.h:3134 [inline]
> packet_xmit+0x257/0x380 net/packet/af_packet.c:276
> packet_snd net/packet/af_packet.c:3087 [inline]
> packet_sendmsg+0x24ca/0x5240 net/packet/af_packet.c:3119
> sock_sendmsg_nosec net/socket.c:730 [inline]
> __sock_sendmsg+0xd5/0x180 net/socket.c:745
> __sys_sendto+0x255/0x340 net/socket.c:2190
> __do_sys_sendto net/socket.c:2202 [inline]
> __se_sys_sendto net/socket.c:2198 [inline]
> __x64_sys_sendto+0xe0/0x1b0 net/socket.c:2198
> do_syscall_x64 arch/x86/entry/common.c:51 [inline]
> do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
> entry_SYSCALL_64_after_hwframe+0x63/0x6b
>
>Found by Linux Verification Center (linuxtesting.org) with Syzkaller
>
>Signed-off-by: Denis Arefev <arefev at swemel.ru>

Could you please provide "Fixes" blaming the commit which itroduced the
bug?


>---
> V1 -> V2: incorrect type in argument 2
> include/linux/virtio_net.h | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
>diff --git a/include/linux/virtio_net.h b/include/linux/virtio_net.h
>index 4dfa9b69ca8d..d1d7825318c3 100644
>--- a/include/linux/virtio_net.h
>+++ b/include/linux/virtio_net.h
>@@ -56,6 +56,7 @@ static inline int virtio_net_hdr_to_skb(struct sk_buff *skb,
> 	unsigned int thlen = 0;
> 	unsigned int p_off = 0;
> 	unsigned int ip_proto;
>+	u64 ret, remainder, gso_size;
> 
> 	if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
> 		switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
>@@ -98,6 +99,16 @@ static inline int virtio_net_hdr_to_skb(struct sk_buff *skb,
> 		u32 off = __virtio16_to_cpu(little_endian, hdr->csum_offset);
> 		u32 needed = start + max_t(u32, thlen, off + sizeof(__sum16));
> 
>+		if (hdr->gso_size) {
>+			gso_size = __virtio16_to_cpu(little_endian, hdr->gso_size);
>+			ret = div64_u64_rem(skb->len, gso_size, &remainder);
>+			if (!(ret && (hdr->gso_size > needed) &&
>+						((remainder > needed) || (remainder == 0)))) {
>+				return -EINVAL;
>+			}
>+			skb_shinfo(skb)->tx_flags |= SKBFL_SHARED_FRAG;
>+		}
>+
> 		if (!pskb_may_pull(skb, needed))
> 			return -EINVAL;
> 
>-- 
>2.25.1
>
>