usercopy: kernel memory overwrite attempt detected to 0000000032ae54ef (kmalloc-1024) (976 bytes)
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kernel BUG at mm/usercopy.c:84!
invalid opcode: 0000 [#1] SMP KASAN
netlink: 2 bytes leftover after parsing attributes in process `syz-executor2'.
Dumping ftrace buffer:
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Modules linked in:
CPU: 0 PID: 15494 Comm: syz-executor0 Not tainted 4.15.0-rc4-next-20171221+ #78
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:report_usercopy mm/usercopy.c:76 [inline]
RIP: 0010:__check_object_size+0x3a2/0x4f0 mm/usercopy.c:276
RSP: 0018:ffff8801d4fb7a30 EFLAGS: 00010286
RAX: 0000000000000061 RBX: ffffffff859297a0 RCX: 0000000000000000
RDX: 0000000000000061 RSI: ffffc90003631000 RDI: ffffed003a9f6f3a
RBP: ffff8801d4fb7b20 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000cf0f4254 R11: 0000000000000000 R12: ffffffff85929760
R13: ffff8801d2e1fb90 R14: 00000000000003d0 R15: ffffea00074b8780
FS:  00007f13fc0d5700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000071c000 CR3: 00000001ce0ca001 CR4: 00000000001626f0
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+0x59c/0x8b0 net/socket.c:1995
 __sys_sendmsg+0xe5/0x210 net/socket.c:2052
 SYSC_sendmsg net/socket.c:2063 [inline]
 SyS_sendmsg+0x2d/0x50 net/socket.c:2059
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452ac9
RSP: 002b:00007f13fc0d4c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f13fc0d5700 RCX: 0000000000452ac9
RDX: 0000000000000000 RSI: 0000000020c7b000 RDI: 0000000000000013
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000
R13: 0000000000a2f7ef R14: 00007f13fc0d59c0 R15: 0000000000000000
Code: 48 0f 44 da e8 d0 7a c1 ff 48 8b 85 28 ff ff ff 4d 89 f1 4c 89 e9 4c 89 e2 48 89 de 48 c7 c7 60 98 92 85 49 89 c0 e8 d6 33 ab ff <0f> 0b 48 c7 c0 20 96 92 85 eb 96 48 c7 c0 60 96 92 85 eb 8d 48 
RIP: report_usercopy mm/usercopy.c:76 [inline] RSP: ffff8801d4fb7a30
RIP: __check_object_size+0x3a2/0x4f0 mm/usercopy.c:276 RSP: ffff8801d4fb7a30
---[ end trace 9d4c186d77e14a41 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
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Kernel Offset: disabled
Rebooting in 86400 seconds..