[syzbot] BUG: unable to handle kernel paging request in vmx_handle_exit_irqoff

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 61c3426aca2c Add linux-next specific files for 20221102
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1238c561880000
kernel config: https://syzkaller.appspot.com/x/.config?x=acb529cc910d907c
dashboard link: https://syzkaller.appspot.com/bug?extid=8cdd16fd5a6c0565e227
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/cc56d88dd6a3/disk-61c3426a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5921b65b080f/vmlinux-61c3426a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/39cbd355fedd/bzImage-61c3426a.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8cdd16...@syzkaller.appspotmail.com

BUG: unable to handle page fault for address: fffffbc0000001d8
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 23ffe4067 P4D 23ffe4067 PUD 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 5970 Comm: syz-executor.4 Not tainted 6.1.0-rc3-next-20221102-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
RIP: 0010:gate_offset arch/x86/include/asm/desc_defs.h:100 [inline]
RIP: 0010:handle_external_interrupt_irqoff arch/x86/kvm/vmx/vmx.c:6818 [inline]
RIP: 0010:vmx_handle_exit_irqoff arch/x86/kvm/vmx/vmx.c:6830 [inline]
RIP: 0010:vmx_handle_exit_irqoff+0x334/0x750 arch/x86/kvm/vmx/vmx.c:6822
Code: 00 01 be 01 03 00 00 48 89 ef e8 27 a4 e8 ff e9 96 fd ff ff e8 9d 3d 5c 00 48 89 e8 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 <0f> b6 0c 10 48 8d 45 01 48 89 c6 48 c1 ee 03 0f b6 14 16 48 89 ee
RSP: 0018:ffffc90005667b38 EFLAGS: 00010806
RAX: 1fffffc0000001d8 RBX: ffff88804eabc000 RCX: ffffc9000a923000
RDX: dffffc0000000000 RSI: ffffffff8120a3b3 RDI: 0000000000000005
RBP: fffffe0000000ec0 R08: 0000000000000005 R09: 0000000080000000
R10: 0000000080000000 R11: 0000000000000000 R12: 00000000800000ec
R13: 0000000080000000 R14: 00000000142ec3c6 R15: ffff88804eabc038
FS: 00007f1a62148700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffbc0000001d8 CR3: 0000000025903000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
vcpu_enter_guest+0x33d1/0x59e0 arch/x86/kvm/x86.c:10815
vcpu_run arch/x86/kvm/x86.c:10964 [inline]
kvm_arch_vcpu_ioctl_run+0xa80/0x2b90 arch/x86/kvm/x86.c:11185
kvm_vcpu_ioctl+0x570/0xfc0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4065
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f1a6148b5a9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1a62148168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1a615abf80 RCX: 00007f1a6148b5a9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007f1a614e67b0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcaaf540cf R14: 00007f1a62148300 R15: 0000000000022000
</TASK>
Modules linked in:
CR2: fffffbc0000001d8
---[ end trace 0000000000000000 ]---
RIP: 0010:gate_offset arch/x86/include/asm/desc_defs.h:100 [inline]
RIP: 0010:handle_external_interrupt_irqoff arch/x86/kvm/vmx/vmx.c:6818 [inline]
RIP: 0010:vmx_handle_exit_irqoff arch/x86/kvm/vmx/vmx.c:6830 [inline]
RIP: 0010:vmx_handle_exit_irqoff+0x334/0x750 arch/x86/kvm/vmx/vmx.c:6822
Code: 00 01 be 01 03 00 00 48 89 ef e8 27 a4 e8 ff e9 96 fd ff ff e8 9d 3d 5c 00 48 89 e8 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 <0f> b6 0c 10 48 8d 45 01 48 89 c6 48 c1 ee 03 0f b6 14 16 48 89 ee
RSP: 0018:ffffc90005667b38 EFLAGS: 00010806
RAX: 1fffffc0000001d8 RBX: ffff88804eabc000 RCX: ffffc9000a923000
RDX: dffffc0000000000 RSI: ffffffff8120a3b3 RDI: 0000000000000005
RBP: fffffe0000000ec0 R08: 0000000000000005 R09: 0000000080000000
R10: 0000000080000000 R11: 0000000000000000 R12: 00000000800000ec
R13: 0000000080000000 R14: 00000000142ec3c6 R15: ffff88804eabc038
FS: 00007f1a62148700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffbc0000001d8 CR3: 0000000025903000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 00 01 add %al,(%rcx)
2: be 01 03 00 00 mov $0x301,%esi
7: 48 89 ef mov %rbp,%rdi
a: e8 27 a4 e8 ff callq 0xffe8a436
f: e9 96 fd ff ff jmpq 0xfffffdaa
14: e8 9d 3d 5c 00 callq 0x5c3db6
19: 48 89 e8 mov %rbp,%rax
1c: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx
23: fc ff df
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 0f b6 0c 10 movzbl (%rax,%rdx,1),%ecx <-- trapping instruction
2e: 48 8d 45 01 lea 0x1(%rbp),%rax
32: 48 89 c6 mov %rax,%rsi
35: 48 c1 ee 03 shr $0x3,%rsi
39: 0f b6 14 16 movzbl (%rsi,%rdx,1),%edx
3d: 48 89 ee mov %rbp,%rsi


---
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[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 61c3426aca2c Add linux-next specific files for 20221102
git tree: linux-next

console+strace: https://syzkaller.appspot.com/x/log.txt?x=13596541880000

kernel config: https://syzkaller.appspot.com/x/.config?x=acb529cc910d907c
dashboard link: https://syzkaller.appspot.com/bug?extid=8cdd16fd5a6c0565e227
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17d036de880000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11d5e00a880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/cc56d88dd6a3/disk-61c3426a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5921b65b080f/vmlinux-61c3426a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/39cbd355fedd/bzImage-61c3426a.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8cdd16...@syzkaller.appspotmail.com

BUG: unable to handle page fault for address: fffffbc0000001d8
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 23ffe4067 P4D 23ffe4067 PUD 0
Oops: 0000 [#1] PREEMPT SMP KASAN

CPU: 0 PID: 5404 Comm: syz-executor526 Not tainted 6.1.0-rc3-next-20221102-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
RIP: 0010:gate_offset arch/x86/include/asm/desc_defs.h:100 [inline]
RIP: 0010:handle_external_interrupt_irqoff arch/x86/kvm/vmx/vmx.c:6818 [inline]
RIP: 0010:vmx_handle_exit_irqoff arch/x86/kvm/vmx/vmx.c:6830 [inline]
RIP: 0010:vmx_handle_exit_irqoff+0x334/0x750 arch/x86/kvm/vmx/vmx.c:6822
Code: 00 01 be 01 03 00 00 48 89 ef e8 27 a4 e8 ff e9 96 fd ff ff e8 9d 3d 5c 00 48 89 e8 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 <0f> b6 0c 10 48 8d 45 01 48 89 c6 48 c1 ee 03 0f b6 14 16 48 89 ee

RSP: 0018:ffffc90004217b38 EFLAGS: 00010806
RAX: 1fffffc0000001d8 RBX: ffff88801f964000 RCX: 0000000000000000

RDX: dffffc0000000000 RSI: ffffffff8120a3b3 RDI: 0000000000000005
RBP: fffffe0000000ec0 R08: 0000000000000005 R09: 0000000080000000
R10: 0000000080000000 R11: 0000000000000000 R12: 00000000800000ec

R13: 0000000080000000 R14: 000000000121e226 R15: ffff88801f964038
FS: 0000555555e9c3c0(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: fffffbc0000001d8 CR3: 00000000213a8000 CR4: 00000000003526f0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
vcpu_enter_guest+0x33d1/0x59e0 arch/x86/kvm/x86.c:10815
vcpu_run arch/x86/kvm/x86.c:10964 [inline]
kvm_arch_vcpu_ioctl_run+0xa80/0x2b90 arch/x86/kvm/x86.c:11185
kvm_vcpu_ioctl+0x570/0xfc0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4065
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

RIP: 0033:0x7fb696cd1f89
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd0f7a3e18 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffd0f7a3e50 RCX: 00007fb696cd1f89

RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005

RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000d3e4
R10: 00007ffd0f7a3e20 R11: 0000000000000246 R12: 00000000000f4240
R13: 000000000000d3e4 R14: 00007ffd0f7a3e3c R15: 00007ffd0f7a3e40

</TASK>
Modules linked in:
CR2: fffffbc0000001d8
---[ end trace 0000000000000000 ]---
RIP: 0010:gate_offset arch/x86/include/asm/desc_defs.h:100 [inline]
RIP: 0010:handle_external_interrupt_irqoff arch/x86/kvm/vmx/vmx.c:6818 [inline]
RIP: 0010:vmx_handle_exit_irqoff arch/x86/kvm/vmx/vmx.c:6830 [inline]
RIP: 0010:vmx_handle_exit_irqoff+0x334/0x750 arch/x86/kvm/vmx/vmx.c:6822
Code: 00 01 be 01 03 00 00 48 89 ef e8 27 a4 e8 ff e9 96 fd ff ff e8 9d 3d 5c 00 48 89 e8 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 <0f> b6 0c 10 48 8d 45 01 48 89 c6 48 c1 ee 03 0f b6 14 16 48 89 ee

RSP: 0018:ffffc90004217b38 EFLAGS: 00010806
RAX: 1fffffc0000001d8 RBX: ffff88801f964000 RCX: 0000000000000000

RDX: dffffc0000000000 RSI: ffffffff8120a3b3 RDI: 0000000000000005
RBP: fffffe0000000ec0 R08: 0000000000000005 R09: 0000000080000000
R10: 0000000080000000 R11: 0000000000000000 R12: 00000000800000ec

R13: 0000000080000000 R14: 000000000121e226 R15: ffff88801f964038
FS: 0000555555e9c3c0(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: fffffbc0000001d8 CR3: 00000000213a8000 CR4: 00000000003526f0

[Sean Christopherson]

On Wed, Nov 02, 2022, syzbot wrote:
> syzbot has found a reproducer for the following issue on:
>
> HEAD commit: 61c3426aca2c Add linux-next specific files for 20221102
> git tree: linux-next
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=13596541880000
> kernel config: https://syzkaller.appspot.com/x/.config?x=acb529cc910d907c
> dashboard link: https://syzkaller.appspot.com/bug?extid=8cdd16fd5a6c0565e227
> compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17d036de880000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11d5e00a880000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/cc56d88dd6a3/disk-61c3426a.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/5921b65b080f/vmlinux-61c3426a.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/39cbd355fedd/bzImage-61c3426a.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+8cdd16...@syzkaller.appspotmail.com
>
> BUG: unable to handle page fault for address: fffffbc0000001d8
> #PF: supervisor read access in kernel mode
> #PF: error_code(0x0000) - not-present page
> PGD 23ffe4067 P4D 23ffe4067 PUD 0
> Oops: 0000 [#1] PREEMPT SMP KASAN
> CPU: 0 PID: 5404 Comm: syz-executor526 Not tainted 6.1.0-rc3-next-20221102-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
> RIP: 0010:gate_offset arch/x86/include/asm/desc_defs.h:100 [inline]

Looks like a KASAN bug, the KVM side of things looks ok and that code hasn't been
touched in quite some time. The actual explosion is in kasan_check_range(), not
KVM code.

I'll bisect, this repros very quickly for me.