linux-kernel - Re: [PATCH 5.15 00/78] 5.15.55-rc1 review

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: <CAHk-=wgq1soM4gudypWLVQdYuvJbXn38LtvJMtnLZX+RTypqLg@mail.gmail.com>
Date:   Wed, 13 Jul 2022 11:40:03 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Guenter Roeck <linux@...ck-us.net>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...e.de>,
        Thadeu Lima de Souza Cascardo <cascardo@...onical.com>
Cc:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        kvm list <kvm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>, patches@...nelci.org,
        lkft-triage@...ts.linaro.org, Pavel Machek <pavel@...x.de>,
        Jon Hunter <jonathanh@...dia.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        Slade Watkins <slade@...dewatkins.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        X86 ML <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
        Alex Bennée <alex.bennee@...aro.org>,
        Anders Roxell <anders.roxell@...aro.org>
Subject: Re: [PATCH 5.15 00/78] 5.15.55-rc1 review

On Wed, Jul 13, 2022 at 11:33 AM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> So I think that that is where the "xaddw_ax_dx+8" comes from: some
> code assumes that FASTOP_SIZE is 8, but that xaddw_ax_dx case was
> actually 9 bytes and thus got that "int3 + padding" in the next 8
> bytes.
>
> The whole kvm x86 emulation thing is quite complicated and has lots
> of instruction size #defines and magic.
>
> I'm not familiar enough with it to go "Ahh, it's obviously XYZ", but
> I'm sure PeterZ and Borislav know exactly what's going on.

And I see that Thadeau already figured it out:

  https://lore.kernel.org/all/20220713171241.184026-1-cascardo@canonical.com/

So presumably we need that patch everywhere.

              Linus