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Subject: [bug#30111] gnu: gcc@7: Apply the 'retpoline' mitigation technique.
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From: ludo@gnu.org (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
References: <877esksi62.fsf@gmail.com> <87d12bgpqh.fsf@gmail.com>
	<87a7xet06p.fsf@gmail.com>
Date: Tue, 16 Jan 2018 15:33:57 +0100
In-Reply-To: <87a7xet06p.fsf@gmail.com> (Alex Vong's message of "Tue, 16 Jan
	2018 21:14:54 +0800")
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To: Alex Vong <alexvong1995@gmail.com>
Cc: 30111@debbugs.gnu.org

Hi Alex,

Alex Vong <alexvong1995@gmail.com> skribis:

> From aea3d11f59e260111bdb8bcac458c97a946fa900 Mon Sep 17 00:00:00 2001
> From: Alex Vong <alexvong1995@gmail.com>
> Date: Tue, 16 Jan 2018 20:32:32 +0800
> Subject: [PATCH] gnu: gcc@7: Apply the 'retpoline' mitigation technique.
>
> This is part of Spectre (branch target injection) [CVE-2017-5715]
> mitigation. Suggested by Mark H Weaver <mhw@netris.org>.
>
> * gnu/local.mk (dist_patch_DATA): Add them.
> * gnu/packages/gcc.scm (gcc@7): Use them.
> * gnu/packages/patches/gcc-retpoline-Change-V-to-bare-reg-names.patch,
> gnu/packages/patches/gcc-retpoline-i386-More-use-reference-of-struct-ix86=
_frame-to-avoi.patch,
> gnu/packages/patches/gcc-retpoline-i386-Move-struct-ix86_frame-to-machine=
_function.patch,
> gnu/packages/patches/gcc-retpoline-i386-Use-reference-of-struct-ix86_fram=
e-to-avoid-cop.patch,
> gnu/packages/patches/gcc-retpoline-indirect-thunk-reg-names.patch,
> gnu/packages/patches/gcc-retpoline-x86-Add-V-register-operand-modifier.pa=
tch,
> gnu/packages/patches/gcc-retpoline-x86-Add-mfunction-return.patch,
> gnu/packages/patches/gcc-retpoline-x86-Add-mindirect-branch-register.patc=
h,
> gnu/packages/patches/gcc-retpoline-x86-Add-mindirect-branch.patch,
> gnu/packages/patches/gcc-retpoline-x86-Disallow-mindirect-branch-mfunctio=
n-return-with-.patch:
> New files.

I=E2=80=99d suggest removing the test suite changes from the patches (curre=
ntly
we don=E2=80=99t run GCC=E2=80=99s test suite.)  Also, =E2=80=98guix lint=
=E2=80=99 may suggest using
shorter file names.

Do you know if a new 7.x including retpoline support is scheduled for
release soon?

Thanks,
Ludo=E2=80=99.