usercopy: kernel memory overwrite attempt detected to 000000004ee3d0df (kmalloc-1024) (1008 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: 0 PID: 18698 Comm: syz-executor7 Not tainted 4.15.0-rc2+ #215
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:report_usercopy mm/usercopy.c:64 [inline]
RIP: 0010:__check_object_size+0x3a2/0x4f0 mm/usercopy.c:264
RSP: 0018:ffff88018f70fa50 EFLAGS: 00010282
RAX: 0000000000000062 RBX: ffffffff85328c40 RCX: 0000000000000000
RDX: 0000000000000062 RSI: ffffc90001988000 RDI: ffffed0031ee1f3e
RBP: ffff88018f70fb40 R08: ffffffff85f3bcf8 R09: 0000000000000000
R10: 00000000c8211892 R11: 0000000000000000 R12: ffffffff85328c00
R13: ffff8801c5c23250 R14: 00000000000003f0 R15: ffffea0007170880
FS:  00007f4dec194700(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000e000 CR3: 00000001bcd87000 CR4: 00000000001426f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 check_object_size include/linux/thread_info.h:112 [inline]
 check_copy_size include/linux/thread_info.h:143 [inline]
 copy_from_user include/linux/uaccess.h:146 [inline]
 ___sys_sendmsg+0x58f/0x8a0 net/socket.c:2003
 __sys_sendmsg+0xe5/0x210 net/socket.c:2060
 SYSC_sendmsg net/socket.c:2071 [inline]
 SyS_sendmsg+0x2d/0x50 net/socket.c:2067
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452a39
RSP: 002b:00007f4dec193c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000758190 RCX: 0000000000452a39
RDX: 0000000020040005 RSI: 00000000208d7fc8 RDI: 0000000000000018
RBP: 000000000000042b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f44a8
R13: 00000000ffffffff R14: 00007f4dec1946d4 R15: 0000000000000008
Code: 48 0f 44 da e8 a0 70 c2 ff 48 8b 85 28 ff ff ff 4d 89 f1 4c 89 e9 4c 89 e2 48 89 de 48 c7 c7 00 8d 32 85 49 89 c0 e8 a6 2e ac ff <0f> 0b 48 c7 c0 c0 8a 32 85 eb 96 48 c7 c0 00 8b 32 85 eb 8d 48 
RIP: report_usercopy mm/usercopy.c:64 [inline] RSP: ffff88018f70fa50
RIP: __check_object_size+0x3a2/0x4f0 mm/usercopy.c:264 RSP: ffff88018f70fa50
---[ end trace 3848f1fc8d8b3d64 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..