linux-kernel - Re: [REGRESSION] x86/entry: Tracer no longer has opportunity to change the syscall number at entry via orig

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Message-ID: <87364gj0ox.fsf@nanos.tec.linutronix.de>
Date:   Fri, 21 Aug 2020 02:35:10 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Kees Cook <keescook@...omium.org>
Cc:     Kyle Huey <me@...ehuey.com>,
        Robert O'Callahan <rocallahan@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "maintainer\:X86 ARCHITECTURE \(32-BIT AND 64-BIT\)" <x86@...nel.org>,
        linux-arch@...r.kernel.org, Will Deacon <will@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Mark Rutland <mark.rutland@....com>,
        Keno Fischer <keno@...iacomputing.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        kvm list <kvm@...r.kernel.org>,
        Gabriel Krisman Bertazi <krisman@...labora.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>
Subject: Re: [REGRESSION] x86/entry: Tracer no longer has opportunity to change the syscall number at entry via orig_ax

On Thu, Aug 20 2020 at 14:09, Kees Cook wrote:
> On Wed, Aug 19, 2020 at 09:44:39PM +0200, Thomas Gleixner wrote:
>> My fault and I have no idead why none of the silly test cases
>> noticed. Fix below.
>
> Hmm, which were you trying? Looking just now, I see that the seccomp
> selftests were failing for all their syscall-changing tests.

/me feels stupid

It's probably all caused by the heat wave which made my brain operate
outside of the specified temperature range.

Thanks,

        tglx