syzbot

audit: type=1400 audit(1521166383.777:7): avc:  denied  { map } for  pid=4206 comm="syzkaller898146" path="/root/syzkaller898146605" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 4206 Comm: syzkaller898146 Not tainted 4.16.0-rc5+ #355
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:native_write_cr4+0x4/0x10 arch/x86/include/asm/special_insns.h:76
RSP: 0018:ffff8801b6a87458 EFLAGS: 00010093
RAX: ffff8801b9660100 RBX: 00000000001606f0 RCX: ffffffff811a5f22
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000001606f0
RBP: ffff8801b6a87458 R08: 1ffff10036d50de7 R09: 0000000000000004
R10: ffff8801b6a873c8 R11: 0000000000000004 R12: 0000000000000093
R13: ffff8801b9660100 R14: ffff8801db21d130 R15: ffff8801db21d130
FS:  000000000166d880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000006e22004 CR4: 00000000001626f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __write_cr4 arch/x86/include/asm/paravirt.h:77 [inline]
 __cr4_set arch/x86/include/asm/tlbflush.h:254 [inline]
 cr4_clear_bits arch/x86/include/asm/tlbflush.h:277 [inline]
 kvm_cpu_vmxoff arch/x86/kvm/vmx.c:3651 [inline]
 hardware_disable+0x34a/0x4b0 arch/x86/kvm/vmx.c:3657
 kvm_arch_hardware_disable+0x35/0xd0 arch/x86/kvm/x86.c:8281
 hardware_disable_nolock+0x30/0x40 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3289
 on_each_cpu+0xca/0x1b0 kernel/smp.c:604
 hardware_disable_all_nolock+0x3e/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3307
 hardware_disable_all arch/x86/kvm/../../../virt/kvm/kvm_main.c:3313 [inline]
 kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:737 [inline]
 kvm_put_kvm+0x956/0xdf0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:750
 kvm_vm_release+0x42/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:761
 __fput+0x327/0x7e0 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0x199/0x270 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x9bb/0x1ad0 kernel/exit.c:865
 do_group_exit+0x149/0x400 kernel/exit.c:968
 SYSC_exit_group kernel/exit.c:979 [inline]
 SyS_exit_group+0x1d/0x20 kernel/exit.c:977
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x441c78
RSP: 002b:00007ffd81e007c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441c78
RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
RBP: 00000000004c1928 R08: 00000000000000e7 R09: ffffffffffffffd0
R10: 0000000000000012 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000006d31a0 R14: 0000000000000000 R15: 0000000000000000
Code: 0f 1f 80 00 00 00 00 55 48 89 e5 0f 20 d8 5d c3 0f 1f 80 00 00 00 00 55 48 89 e5 0f 22 df 5d c3 0f 1f 80 00 00 00 00 55 48 89 e5 <0f> 22 e7 5d c3 0f 1f 80 00 00 00 00 55 48 89 e5 44 0f 20 c0 5d 
RIP: native_write_cr4+0x4/0x10 arch/x86/include/asm/special_insns.h:76 RSP: ffff8801b6a87458
---[ end trace f3c8ee5319a86168 ]---