linux-kernel - Re: [syzbot] BUG: unable to handle kernel paging request in get

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Date:   Fri, 4 Nov 2022 15:28:10 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     syzbot <syzbot+ffb4f000dc2872c93f62@...kaller.appspotmail.com>
Cc:     bp@...en8.de, brgerst@...il.com, dave.hansen@...ux.intel.com,
        hpa@...or.com, kirill@...temov.name, linux-kernel@...r.kernel.org,
        mingo@...hat.com, peterz@...radead.org,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de,
        thomas.lendacky@....com, x86@...nel.org
Subject: Re: [syzbot] BUG: unable to handle kernel paging request in get_desc

On Fri, Nov 04, 2022, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    81214a573d19 Add linux-next specific files for 20221103
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=132019de880000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=cdc625e9234bac0
> dashboard link: https://syzkaller.appspot.com/bug?extid=ffb4f000dc2872c93f62
> 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=12dd52ca880000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/5d4dda497754/disk-81214a57.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/9658efff160a/vmlinux-81214a57.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/3711180f2565/bzImage-81214a57.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+ffb4f000dc2872c93f62@...kaller.appspotmail.com
> 
> BUG: unable to handle page fault for address: fffffbc5a1c22e00
> #PF: supervisor read access in kernel mode
> #PF: error_code(0x0000) - not-present page
> PGD 23ffe4067 P4D 23ffe4067 PUD 13ff2d067 PMD 13ff2c067 PTE 0
> Oops: 0000 [#1] PREEMPT SMP KASAN
> CPU: 0 PID: 5368 Comm: syz-executor.2 Not tainted 6.1.0-rc3-next-20221103-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
> RIP: 0010:get_desc+0x128/0x460 arch/x86/lib/insn-eval.c:660

I'm pretty sure this is the same thing as 

  BUG: unable to handle kernel paging request in vmx_handle_exit_irqoff

I'll verify and get a patch posted shortly.