usercopy: kernel memory overwrite attempt detected to 00000000cef85552 (kmalloc-1024) (1024 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: 13652 Comm: syz-executor6 Not tainted 4.15.0-rc5+ #243
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:ffff8801ccfff158 EFLAGS: 00010286
RAX: 0000000000000062 RBX: ffffffff85928740 RCX: 0000000000000000
RDX: 0000000000000062 RSI: ffffc90002cbe000 RDI: ffffed00399ffe1f
RBP: ffff8801ccfff248 R08: 1ffff100399ffdad R09: 0000000000000000
R10: 0000000055b00a3a R11: 0000000000000000 R12: ffffffff85928700
R13: ffff8801d50cdb50 R14: 0000000000000400 R15: ffffea0007543300
FS:  00007f2bdcbdf700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000a2fa38 CR3: 00000001c6cf7004 CR4: 00000000001626e0
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+0x1974/0x4740 arch/x86/kvm/x86.c:3499
 kvm_vcpu_ioctl+0x240/0x1010 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2734
 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:00007f2bdcbdec58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ac9
RDX: 0000000020321c00 RSI: 000000004400ae8f RDI: 0000000000000015
RBP: 00000000000001f8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f0fe0
R13: 00000000ffffffff R14: 00007f2bdcbdf6d4 R15: 0000000000000000
Code: 48 0f 44 da e8 90 76 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 88 92 85 49 89 c0 e8 e6 2f ac ff <0f> 0b 48 c7 c0 c0 85 92 85 eb 96 48 c7 c0 00 86 92 85 eb 8d 48 
RIP: report_usercopy mm/usercopy.c:64 [inline] RSP: ffff8801ccfff158
RIP: __check_object_size+0x3a2/0x4f0 mm/usercopy.c:264 RSP: ffff8801ccfff158
---[ end trace 2075bf078e708679 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..