linux-kernel - Re: [PATCH v6 01/27] x86/crypto: Adapt assembly for PIE support

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Message-ID: <CAJcbSZGzTZmkpCWC3VbLJ7ygkxiRSAfq+GNOkHUungUEjiURTw@mail.gmail.com>
Date:   Thu, 7 Feb 2019 09:01:57 -0800
From:   Thomas Garnier <thgarnie@...omium.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        Kristen Carlson Accardi <kristen@...ux.intel.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 01/27] x86/crypto: Adapt assembly for PIE support

On Thu, Feb 7, 2019 at 3:49 AM Borislav Petkov <bp@...en8.de> wrote:
>
> On Thu, Jan 31, 2019 at 11:24:08AM -0800, Thomas Garnier wrote:
> > Change the assembly code to use only relative references of symbols for the
> > kernel to be PIE compatible.
> >
> > Position Independent Executable (PIE) support will allow to extend the
> > KASLR randomization range below 0xffffffff80000000.
>
> This sentence is auto-sprinkled in a bunch of commit messages. Sounds to
> me it should be rather somewhere in the 0/n message as a justification
> for the feature but not in every other commit message...?

I go into more details in the compose message but I wanted a small
sentence explaining why PIE changes are being made.

>
> --
> Regards/Gruss,
>     Boris.
>
> Good mailing practices for 400: avoid top-posting and trim the reply.