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Date:   Sat, 9 Dec 2017 19:39:05 +0800
From:   Tianyu Lan <lantianyu1986@...il.com>
To:     syzbot 
        <bot+b19026412c772c86fca485fc8342e3490da9c269@...kaller.appspotmail.com>
Cc:     "H. Peter Anvin" <hpa@...or.com>, kvm <kvm@...r.kernel.org>,
        "linux-kernel@...r kernel org" <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krcmar <rkrcmar@...hat.com>,
        syzkaller-bugs@...glegroups.com,
        Thomas Gleixner <tglx@...utronix.de>,
        "the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: KASAN: stack-out-of-bounds Read in write_mmio

2017-12-09 17:15 GMT+08:00 syzbot
<bot+b19026412c772c86fca485fc8342e3490da9c269@...kaller.appspotmail.com>:
> syzkaller has found reproducer for the following crash on
> ad4dac17f9d563b9e34aab78a34293b10993e9b5
> git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/master
> compiler: gcc (GCC) 7.1.1 20170620
> .config is attached
> Raw console output is attached.
> C reproducer is attached
> syzkaller reproducer is attached. See https://goo.gl/kgGztJ
> for information about syzkaller reproducers
>
>
> kvm: KVM_SET_TSS_ADDR need to be called before entering vcpu
> ==================================================================
> BUG: KASAN: stack-out-of-bounds in write_mmio+0x560/0x600
> arch/x86/kvm/x86.c:4669
> Read of size 8 at addr ffff8801c4587220 by task syzkaller601256/3159
>
> CPU: 1 PID: 3159 Comm: syzkaller601256 Not tainted 4.15.0-rc2-next-20171208+
> #63
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
>  __dump_stack lib/dump_stack.c:17 [inline]
>  dump_stack+0x194/0x257 lib/dump_stack.c:53
>  print_address_description+0x73/0x250 mm/kasan/report.c:252
>  kasan_report_error mm/kasan/report.c:351 [inline]
>  kasan_report+0x25b/0x340 mm/kasan/report.c:409
>  __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430
>  write_mmio+0x560/0x600 arch/x86/kvm/x86.c:4669
>  emulator_read_write_onepage+0x45a/0xea0 arch/x86/kvm/x86.c:4739
>  emulator_read_write+0xe7/0x540 arch/x86/kvm/x86.c:4788
>  emulator_write_emulated arch/x86/kvm/x86.c:4825 [inline]
>  emulator_fix_hypercall+0x14d/0x1b0 arch/x86/kvm/x86.c:6349
>  em_hypercall+0x5d/0x120 arch/x86/kvm/emulate.c:3705
>  x86_emulate_insn+0x55d/0x3c20 arch/x86/kvm/emulate.c:5498
>  x86_emulate_instruction+0x411/0x1ad0 arch/x86/kvm/x86.c:5756
>  emulate_instruction arch/x86/include/asm/kvm_host.h:1177 [inline]
>  handle_exception+0x3d5/0xa20 arch/x86/kvm/vmx.c:5921
>  vmx_handle_exit+0x25d/0x1ce0 arch/x86/kvm/vmx.c:8887
>  vcpu_enter_guest arch/x86/kvm/x86.c:7068 [inline]
>  vcpu_run arch/x86/kvm/x86.c:7130 [inline]
>  kvm_arch_vcpu_ioctl_run+0x1836/0x5be0 arch/x86/kvm/x86.c:7300
>  kvm_vcpu_ioctl+0x64c/0x1010 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2555
>  vfs_ioctl fs/ioctl.c:46 [inline]
>  do_vfs_ioctl+0x1b1/0x1530 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: 0033:0x4435c9
> RSP: 002b:00007fffdf34ced8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
> RAX: ffffffffffffffda RBX: 00000000205b3000 RCX: 00000000004435c9
> RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
> RBP: 000000000000000b R08: 0000000000000000 R09: 0000000000000002
> R10: 0000000000000012 R11: 0000000000000202 R12: 00000000205b7e00
> R13: 00000000205b6e00 R14: 00000000205b7a00 R15: 00000000205b3000
>
> The buggy address belongs to the page:
> page:000000002e827842 count:0 mapcount:0 mapping:          (null) index:0x0
> flags: 0x2fffc0000000000()
> raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff
> raw: 0000000000000000 0000000100000001 0000000000000000 0000000000000000
> page dumped because: kasan: bad access detected
>
> Memory state around the buggy address:
>  ffff8801c4587100: f2 f2 f2 f2 00 f2 f2 f2 f3 f3 f3 f3 00 00 00 00
>  ffff8801c4587180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>
>> ffff8801c4587200: f1 f1 f1 f1 03 f2 f2 f2 f3 f3 f3 f3 00 00 00 00
>
>                                ^
>  ffff8801c4587280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>  ffff8801c4587300: 00 f1 f1 f1 f1 02 f2 f2 f2 f2 f2 f2 f2 00 f2 f2
> ==================================================================
>

This issue seems to be as same as previous pop issue. I will have a look.

-- 
Best regards
Tianyu Lan

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