syzbot


general protection fault in kvm_cpuid

Status: fixed on 2017/10/24 22:03
Fix commit: d1cd3ce90044 KVM: MMU: check guest CR3 reserved bits based on its physical address width.
First crash: 2414d, last: 2395d

Sample crash report:
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: 1 PID: 2983 Comm: syzkaller207407 Not tainted 4.13.0+ #77
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801cf78a480 task.stack: ffff8801cebb0000
RIP: 0010:kvm_cpuid+0xcf/0x8e0 arch/x86/kvm/cpuid.c:864
RSP: 0018:ffff8801cebb7088 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff8801cebb7208 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff8801cebb7208 RDI: ffff8801ce698040
RBP: ffff8801cebb7180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: ffffed0039cd3551 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
FS:  000000000141e880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020a74800 CR3: 00000001c0393000 CR4: 00000000001426e0
Call Trace:
 emulator_get_cpuid+0x46/0x60 arch/x86/kvm/x86.c:5250
 check_cr_write+0x379/0x7d0 arch/x86/kvm/emulate.c:4107
 x86_emulate_insn+0x2940/0x3cf0 arch/x86/kvm/emulate.c:5404
 x86_emulate_instruction+0x411/0x1ca0 arch/x86/kvm/x86.c:5735
 emulate_instruction arch/x86/include/asm/kvm_host.h:1160 [inline]
 handle_invalid_guest_state arch/x86/kvm/vmx.c:6563 [inline]
 vmx_handle_exit+0x6d8/0x1a60 arch/x86/kvm/vmx.c:8775
 vcpu_enter_guest arch/x86/kvm/x86.c:7038 [inline]
 vcpu_run arch/x86/kvm/x86.c:7100 [inline]
 kvm_arch_vcpu_ioctl_run+0x1d36/0x5a30 arch/x86/kvm/x86.c:7261
 kvm_vcpu_ioctl+0x64c/0x1010 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2550
 vfs_ioctl fs/ioctl.c:45 [inline]
 do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:685
 SYSC_ioctl fs/ioctl.c:700 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x443489
RSP: 002b:00007ffd2d62ee58 EFLAGS: 00000206 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000443489
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 0000000000000082 R08: 0000000000000000 R09: 00000000004002c8
R10: 0000000000000012 R11: 0000000000000206 R12: 0000000000009120
R13: 000000002aaaaaab R14: 0000000000000004 R15: 0000000020a71000
Code: 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 4d 06 00 00 8b 03 4c 89 e2 48 c1 ea 03 89 85 34 ff ff ff 48 b8 00 00 00 00 00 fc ff df <0f> b6 14 02 4c 89 e0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 
RIP: kvm_cpuid+0xcf/0x8e0 arch/x86/kvm/cpuid.c:864 RSP: ffff8801cebb7088
---[ end trace cf9b92bb988d4a81 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (20):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2017/09/10 19:56 upstream 4dfc2788033d d18bfda0 .config console log report syz C ci-upstream-kasan-gce
2017/09/18 17:54 upstream ebb2c2437d80 d394531e .config console log report ci-upstream-kasan-gce
2017/09/18 04:03 upstream 0666f560b71b 96b8e399 .config console log report ci-upstream-kasan-gce
2017/09/12 18:49 upstream c971aa3693e1 0bd6a0a5 .config console log report ci-upstream-kasan-gce
2017/09/10 19:34 upstream 4dfc2788033d d18bfda0 .config console log report ci-upstream-kasan-gce
2017/09/20 01:41 upstream 12fcf66e74b1 d394531e .config console log report ci-upstream-kasan-gce-386
2017/09/25 07:21 mmots 720bbe532b7c c26ea367 .config console log report ci-upstream-mmots-kasan-gce
2017/09/24 09:04 mmots 720bbe532b7c c26ea367 .config console log report ci-upstream-mmots-kasan-gce
2017/09/23 18:01 mmots 720bbe532b7c c26ea367 .config console log report ci-upstream-mmots-kasan-gce
2017/09/19 08:46 mmots 720bbe532b7c c26ea367 .config console log report ci-upstream-mmots-kasan-gce
2017/09/17 01:57 linux-next 1f183459b514 da1873aa .config console log report skylake-linux-next-kasan-qemu
2017/09/16 15:33 mmots 720bbe532b7c c26ea367 .config console log report ci-upstream-mmots-kasan-gce
2017/09/15 11:44 linux-next 1f183459b514 da1873aa .config console log report skylake-linux-next-kasan-qemu
2017/09/13 17:34 linux-next 6f20b7a58cb9 96b8e399 .config console log report skylake-linux-next-kasan-qemu
2017/09/12 11:28 linux-next 0d71e2d4aa14 0bd6a0a5 .config console log report ci-upstream-next-kasan-gce
2017/09/07 17:52 mmots f7e207ece64a 0ed1da4a .config console log report ci-upstream-mmots-kasan-gce
2017/09/06 07:02 linux-next e9fcbcd00963 0ed1da4a .config console log report skylake-linux-next-kasan-qemu
2017/09/06 07:01 mmots c97efd59aceb 0ed1da4a .config console log report ci-upstream-mmots-kasan-gce
2017/09/06 05:51 linux-next 744c56def809 0ed1da4a .config console log report skylake-linux-next-kasan-qemu
2017/09/06 02:20 mmots c97efd59aceb 0ed1da4a .config console log report ci-upstream-mmots-kasan-gce
* Struck through repros no longer work on HEAD.