linux-kernel - Re: [PATCH v3 2/4] x86/traps: Print non-canonical address on #GP

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Message-ID: <CAG48ez26RGztX7O9Ej5rbz2in0KBAEnj1ic5C-8ie7=hzc+d=w@mail.gmail.com>
Date:   Wed, 20 Nov 2019 13:25:30 +0100
From:   Jann Horn <jannh@...gle.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        kernel list <linux-kernel@...r.kernel.org>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH v3 2/4] x86/traps: Print non-canonical address on #GP

On Wed, Nov 20, 2019 at 12:24 PM Borislav Petkov <bp@...en8.de> wrote:
> On Wed, Nov 20, 2019 at 12:18:59PM +0100, Ingo Molnar wrote:
> > How was this maximum string length of '90' derived? In what way will
> > that have to change if someone changes the message?
>
> That was me counting the string length in a dirty patch in a previous
> thread. We probably should say why we decided for a certain length and
> maybe have a define for it.

Do you think something like this would be better?

char desc[sizeof(GPFSTR) + 50 + 2*sizeof(unsigned long) + 1] = GPFSTR;