usercopy: kernel memory exposure attempt detected from ffff8801d608b7cc (<wrapped address>) (18446744073709551614 bytes)
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kernel BUG at mm/usercopy.c:72!
invalid opcode: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 26435 Comm: syz-executor4 Not tainted 4.13.0-rc4+ #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d23d0440 task.stack: ffff8801d2920000
RIP: 0010:report_usercopy mm/usercopy.c:64 [inline]
RIP: 0010:__check_object_size+0x3a2/0x4f0 mm/usercopy.c:264
RSP: 0018:ffff8801d29278a8 EFLAGS: 00010286
RAX: 0000000000000078 RBX: ffffffff84f15bc0 RCX: 0000000000000000
RDX: 0000000000000078 RSI: ffffffff81592f0e RDI: ffffed003a524f09
RBP: ffff8801d2927998 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff84f15b80
R13: ffff8801d608b7cc R14: fffffffffffffffe R15: ffff8801d608b7cc
FS:  00007f875c5a4700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001ddbc21000 CR3: 00000001d1c93000 CR4: 00000000001406e0
Call Trace:
 check_object_size include/linux/thread_info.h:108 [inline]
 check_copy_size include/linux/thread_info.h:139 [inline]
 copy_to_iter include/linux/uio.h:105 [inline]
 copy_linear_skb include/net/udp.h:371 [inline]
 udpv6_recvmsg+0x1040/0x1af0 net/ipv6/udp.c:399
 inet_recvmsg+0x14c/0x5f0 net/ipv4/af_inet.c:793
 sock_recvmsg_nosec net/socket.c:806 [inline]
 sock_recvmsg+0xc9/0x110 net/socket.c:813
 SYSC_recvfrom+0x2d6/0x570 net/socket.c:1802
 SyS_recvfrom+0x40/0x50 net/socket.c:1774
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x4512e9
RSP: 002b:00007f875c5a3c08 EFLAGS: 00000216 ORIG_RAX: 000000000000002d
RAX: ffffffffffffffda RBX: 0000000000718000 RCX: 00000000004512e9
RDX: 0000000000000042 RSI: 0000000020dfd000 RDI: 0000000000000005
RBP: 0000000000000086 R08: 0000000020000000 R09: 0000000000000000
R10: 0000000000000042 R11: 0000000000000216 R12: 00000000004b645f
R13: 00000000ffffffff R14: 0000000000000005 R15: 0000000020d85fe4
Code: 48 0f 44 da e8 60 49 c6 ff 48 8b 85 28 ff ff ff 4d 89 f1 4c 89 e9 4c 89 e2 48 89 de 48 c7 c7 00 5c f1 84 49 89 c0 e8 43 72 b1 ff <0f> 0b 48 c7 c0 c0 59 f1 84 eb 96 48 c7 c0 00 5a f1 84 eb 8d 48 
RIP: report_usercopy mm/usercopy.c:64 [inline] RSP: ffff8801d29278a8
RIP: __check_object_size+0x3a2/0x4f0 mm/usercopy.c:264 RSP: ffff8801d29278a8
---[ end trace dfa367c421397e8e ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..