usercopy: kernel memory overwrite attempt detected to 00000000d1af0a39 (kmalloc-1024) (1024 bytes)
------------[ cut here ]------------
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: 30576 Comm: syz-executor1 Not tainted 4.15.0-rc2+ #123
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:ffff8801ccee7030 EFLAGS: 00010286
RAX: 0000000000000062 RBX: ffffffff85328c40 RCX: 0000000000000000
RDX: 0000000000000062 RSI: ffffc900014e6000 RDI: ffffed00399dcdfa
RBP: ffff8801ccee7120 R08: 1ffff100399dcd88 R09: 0000000000000000
R10: 0000000099a8a373 R11: 0000000000000000 R12: ffffffff85328c00
R13: ffff8801d5fa5710 R14: 0000000000000400 R15: ffffea000757e900
FS:  0000000000000000(0000) GS:ffff8801db400000(0063) knlGS:00000000f7714b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000008370008 CR3: 00000001c0ebe000 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]
 memdup_user+0x46/0x90 mm/util.c:168
 kvm_arch_vcpu_ioctl+0x1ba3/0x4710 arch/x86/kvm/x86.c:3500
 kvm_vcpu_ioctl+0x240/0x1010 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2726
 kvm_vcpu_compat_ioctl+0x364/0x450 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2769
 C_SYSC_ioctl fs/compat_ioctl.c:1473 [inline]
 compat_SyS_ioctl+0x151/0x2a30 fs/compat_ioctl.c:1419
 do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
 do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
 entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:125
RIP: 0023:0xf7f81c79
RSP: 002b:00000000f771408c EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000015 RCX: 000000004400ae8f
RDX: 0000000020ebec00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
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: ffff8801ccee7030
RIP: __check_object_size+0x3a2/0x4f0 mm/usercopy.c:264 RSP: ffff8801ccee7030
---[ end trace fc11d616052b6098 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..