linux-kernel - Re: [PATCH v9 01/11] x86/crypto: Adapt assembly for PIE support

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Message-ID: <201908050952.BC1F7C3@keescook>
Date:   Mon, 5 Aug 2019 09:54:44 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Thomas Garnier <thgarnie@...omium.org>,
        kernel-hardening@...ts.openwall.com, 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>, x86@...nel.org,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 01/11] x86/crypto: Adapt assembly for PIE support

On Mon, Aug 05, 2019 at 06:32:02PM +0200, Borislav Petkov wrote:
> On Tue, Jul 30, 2019 at 12:12:45PM -0700, 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.
> 
> I believe in previous reviews I asked about why this sentence is being
> replicated in every commit message and now it is still in every commit
> message except in 2/11.
> 
> Why do you need it everywhere and not once in the 0th mail?

I think there was some long-ago feedback from someone (Ingo?) about
giving context for the patch so looking at one individually would let
someone know that it was part of a larger series. This is a distant
memory, though. Do you think it should just be dropped in each patch?

-- 
Kees Cook