CVE-2023-53439

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net: skb_partial_csum_set() fix against transport header magic value<br /> <br /> skb-&gt;transport_header uses the special 0xFFFF value<br /> to mark if the transport header was set or not.<br /> <br /> We must prevent callers to accidentaly set skb-&gt;transport_header<br /> to 0xFFFF. Note that only fuzzers can possibly do this today.<br /> <br /> syzbot reported:<br /> <br /> WARNING: CPU: 0 PID: 2340 at include/linux/skbuff.h:2847 skb_transport_offset include/linux/skbuff.h:2956 [inline]<br /> WARNING: CPU: 0 PID: 2340 at include/linux/skbuff.h:2847 virtio_net_hdr_to_skb+0xbcc/0x10c0 include/linux/virtio_net.h:103<br /> Modules linked in:<br /> CPU: 0 PID: 2340 Comm: syz-executor.0 Not tainted 6.3.0-syzkaller #0<br /> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023<br /> RIP: 0010:skb_transport_header include/linux/skbuff.h:2847 [inline]<br /> RIP: 0010:skb_transport_offset include/linux/skbuff.h:2956 [inline]<br /> RIP: 0010:virtio_net_hdr_to_skb+0xbcc/0x10c0 include/linux/virtio_net.h:103<br /> Code: 41 39 df 0f 82 c3 04 00 00 48 8b 7c 24 10 44 89 e6 e8 08 6e 59 ff 48 85 c0 74 54 e8 ce 36 7e fc e9 37 f8 ff ff e8 c4 36 7e fc 0b e9 93 f8 ff ff 44 89 f7 44 89 e6 e8 32 38 7e fc 45 39 e6 0f<br /> RSP: 0018:ffffc90004497880 EFLAGS: 00010293<br /> RAX: ffffffff84fea55c RBX: 000000000000ffff RCX: ffff888120be2100<br /> RDX: 0000000000000000 RSI: 000000000000ffff RDI: 000000000000ffff<br /> RBP: ffffc90004497990 R08: ffffffff84fe9de5 R09: 0000000000000034<br /> R10: ffffea00048ebd80 R11: 0000000000000034 R12: ffff88811dc2d9c8<br /> R13: dffffc0000000000 R14: ffff88811dc2d9ae R15: 1ffff11023b85b35<br /> FS: 00007f9211a59700(0000) GS:ffff8881f6c00000(0000) knlGS:0000000000000000<br /> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033<br /> CR2: 00000000200002c0 CR3: 00000001215a5000 CR4: 00000000003506f0<br /> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000<br /> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400<br /> Call Trace:<br /> <br /> packet_snd net/packet/af_packet.c:3076 [inline]<br /> packet_sendmsg+0x4590/0x61a0 net/packet/af_packet.c:3115<br /> sock_sendmsg_nosec net/socket.c:724 [inline]<br /> sock_sendmsg net/socket.c:747 [inline]<br /> __sys_sendto+0x472/0x630 net/socket.c:2144<br /> __do_sys_sendto net/socket.c:2156 [inline]<br /> __se_sys_sendto net/socket.c:2152 [inline]<br /> __x64_sys_sendto+0xe5/0x100 net/socket.c:2152<br /> do_syscall_x64 arch/x86/entry/common.c:50 [inline]<br /> do_syscall_64+0x2f/0x50 arch/x86/entry/common.c:80<br /> entry_SYSCALL_64_after_hwframe+0x63/0xcd<br /> RIP: 0033:0x7f9210c8c169<br /> Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48<br /> RSP: 002b:00007f9211a59168 EFLAGS: 00000246 ORIG_RAX: 000000000000002c<br /> RAX: ffffffffffffffda RBX: 00007f9210dabf80 RCX: 00007f9210c8c169<br /> RDX: 000000000000ffed RSI: 00000000200000c0 RDI: 0000000000000003<br /> RBP: 00007f9210ce7ca1 R08: 0000000020000540 R09: 0000000000000014<br /> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000<br /> R13: 00007ffe135d65cf R14: 00007f9211a59300 R15: 0000000000022000