usercopy: kernel memory overwrite attempt detected to 000000005f65aa98 (kmalloc-1024) (984 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: 28454 Comm: syz-executor2 Not tainted 4.15.0-rc1+ #136
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: 00000000b15105ee task.stack: 000000006517cd11
RIP: 0010:report_usercopy mm/usercopy.c:64 [inline]
RIP: 0010:__check_object_size+0x3a2/0x4f0 mm/usercopy.c:264
RSP: 0018:ffff8801d367f940 EFLAGS: 00010282
RAX: 0000000000000061 RBX: ffffffff85328540 RCX: 0000000000000000
RDX: 0000000000000061 RSI: ffffc90003f9d000 RDI: ffffed003a6cff1c
RBP: ffff8801d367fa30 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000128d9c47 R11: 0000000000000000 R12: ffffffff85328500
R13: ffff8801c5baadd0 R14: 00000000000003d8 R15: ffffea000716ea80
FS:  00007f049aeae700(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000071328c CR3: 00000001c2c6f000 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:00007f049aeadc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 00000000004529d9
RDX: 0000000000000002 RSI: 00000000201ce000 RDI: 0000000000000015
RBP: 000000000000039b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000004000 R11: 0000000000000212 R12: 00000000006f2728
R13: 00000000ffffffff R14: 00007f049aeae6d4 R15: 0000000000000000
Code: 48 0f 44 da e8 e0 74 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 86 32 85 49 89 c0 e8 d3 32 ac ff <0f> 0b 48 c7 c0 c0 83 32 85 eb 96 48 c7 c0 00 84 32 85 eb 8d 48 
RIP: report_usercopy mm/usercopy.c:64 [inline] RSP: ffff8801d367f940
RIP: __check_object_size+0x3a2/0x4f0 mm/usercopy.c:264 RSP: ffff8801d367f940
---[ end trace 60a79b1af3fae9c0 ]---
netlink: 5 bytes leftover after parsing attributes in process `syz-executor4'.
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
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Kernel Offset: disabled
Rebooting in 86400 seconds..