usercopy: kernel memory overwrite attempt detected to 000000005845a963 (kmalloc-1024) (960 bytes)
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kernel BUG at mm/usercopy.c:72!
netlink: 13 bytes leftover after parsing attributes in process `syz-executor0'.
netlink: 1 bytes leftover after parsing attributes in process `syz-executor1'.
invalid opcode: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 31156 Comm: syz-executor6 Not tainted 4.15.0-rc1+ #140
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
netlink: 1 bytes leftover after parsing attributes in process `syz-executor1'.
task: 00000000a38e339e task.stack: 000000004bfadd9e
RIP: 0010:report_usercopy mm/usercopy.c:64 [inline]
RIP: 0010:__check_object_size+0x3a2/0x4f0 mm/usercopy.c:264
RSP: 0018:ffff8801d18c7940 EFLAGS: 00010282
RAX: 0000000000000061 RBX: ffffffff85328640 RCX: 0000000000000000
RDX: 0000000000000061 RSI: ffffc9000343f000 RDI: ffffed003a318f1c
RBP: ffff8801d18c7a30 R08: 0000000000000000 R09: 0000000000000000
netlink: 13 bytes leftover after parsing attributes in process `syz-executor0'.
R10: 0000000070305a03 R11: 0000000000000000 R12: ffffffff85328600
R13: ffff8801d96a5710 R14: 00000000000003c0 R15: ffffea000765a900
FS:  00007f6a323e8700(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b9bc23000 CR3: 00000001a39b6000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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:2025
 __sys_sendmmsg+0x1e6/0x5f0 net/socket.c:2138
 SYSC_sendmmsg net/socket.c:2169 [inline]
 SyS_sendmmsg+0x35/0x60 net/socket.c:2164
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x4529d9
RSP: 002b:00007f6a323e7c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 00000000004529d9
RDX: 0000000000000001 RSI: 000000002053c000 RDI: 0000000000000013
RBP: 000000000000039b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f2728
R13: 00000000ffffffff R14: 00007f6a323e86d4 R15: 0000000000000000
Code: 48 0f 44 da e8 20 73 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 87 32 85 49 89 c0 e8 13 31 ac ff <0f> 0b 48 c7 c0 c0 84 32 85 eb 96 48 c7 c0 00 85 32 85 eb 8d 48 
RIP: report_usercopy mm/usercopy.c:64 [inline] RSP: ffff8801d18c7940
RIP: __check_object_size+0x3a2/0x4f0 mm/usercopy.c:264 RSP: ffff8801d18c7940
---[ end trace 995e2cd4ab19247e ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..