linux-kernel - Re: [PATCH 1/5] Kconfig: Add option for asm goto w/ tied outputs to workaround clang-13 bug

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 for Android: free password hash cracker in your pocket

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

Message-ID: <CAKwvOdk3rtHCDfW-kCmmQ=UueeXpVVBnG1XGwdoiWWHZgmt5yQ@mail.gmail.com>
Date:   Tue, 1 Feb 2022 13:15:57 -0800
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        llvm@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        syzbot+6cde2282daa792c49ab8@...kaller.appspotmail.com
Subject: Re: [PATCH 1/5] Kconfig: Add option for asm goto w/ tied outputs to
 workaround clang-13 bug

On Tue, Feb 1, 2022 at 12:56 PM Sean Christopherson <seanjc@...gle.com> wrote:
>
> On Tue, Feb 01, 2022, Nick Desaulniers wrote:
> > Note: gcc-10 had a bug with the symbolic references to labels when
> > using tied constraints.
> > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98096
> >
> > Both compilers had bugs here, and it may be worth mentioning that in
> > the commit message.
>
> Is this wording accurate?
>
>   gcc also had a similar bug[3], fixed in gcc-11, where gcc failed to
>   account for its behavior of assigning two numbers to tied outputs (one
>   for input, one for output) when evaluating symbolic references.

SGTM
-- 
Thanks,
~Nick Desaulniers