usercopy: kernel memory overwrite attempt detected to 00000000e934dc52 (kmalloc-1024) (1024 bytes)
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kernel BUG at mm/usercopy.c:84!
invalid opcode: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 21005 Comm: syz-executor5 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:ffff8801be3ef158 EFLAGS: 00010286
RAX: 0000000000000062 RBX: ffffffff859297a0 RCX: 0000000000000000
RDX: 0000000000000062 RSI: ffffc900035b4000 RDI: ffffed0037c7de1f
RBP: ffff8801be3ef248 R08: 1ffff10037c7ddad R09: 0000000000000000
R10: 000000003f22adde R11: 0000000000000000 R12: ffffffff85929760
R13: ffff8801d2dd7b50 R14: 0000000000000400 R15: ffffea00074b7580
FS:  00007fa76fec1700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000071c000 CR3: 00000001cdb7b005 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]
 memdup_user+0x46/0x90 mm/util.c:168
 kvm_arch_vcpu_ioctl+0x1984/0x4760 arch/x86/kvm/x86.c:3550
 kvm_vcpu_ioctl+0x244/0xff0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2706
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452ac9
RSP: 002b:00007fa76fec0c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ac9
RDX: 0000000020ccd000 RSI: 000000004400ae8f RDI: 0000000000000015
RBP: 00000000000001fa R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f1010
R13: 00000000ffffffff R14: 00007fa76fec16d4 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: ffff8801be3ef158
RIP: __check_object_size+0x3a2/0x4f0 mm/usercopy.c:276 RSP: ffff8801be3ef158
---[ end trace d51a716f21bb2afa ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..