linux-kernel - Re: general protection fault in vmx_vcpu

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20210224174936.GG20344@zn.tnic>
Date:   Wed, 24 Feb 2021 18:49:36 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     syzbot <syzbot+42a71c84ef04577f1aef@...kaller.appspotmail.com>,
        Dave Hansen <dave.hansen@...el.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        KVM list <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Lorenzo Stoakes <lstoakes@...il.com>,
        Ingo Molnar <mingo@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>, seanjc@...gle.com,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vitaly Kuznetsov <vkuznets@...hat.com>, wanpengli@...cent.com,
        the arch/x86 maintainers <x86@...nel.org>
Subject: Re: general protection fault in vmx_vcpu_run (2)

Hi Dmitry,

On Wed, Feb 24, 2021 at 06:12:57PM +0100, Dmitry Vyukov wrote:
> Looking at the bisection log, the bisection was distracted by something else.

Meaning the bisection result:

167dcfc08b0b ("x86/mm: Increase pgt_buf size for 5-level page tables")

is bogus?

> You can always find the original reported issue over the dashboard link:
> https://syzkaller.appspot.com/bug?extid=42a71c84ef04577f1aef
> or on lore:
> https://lore.kernel.org/lkml/0000000000007ff56205ba985b60@google.com/

Ok, so this looks like this is trying to run kvm ioctls *in* a guest,
i.e., nested. Right?

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette