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Message-ID: <CAKv+Gu8TSBAz5vykf6iseYeGOaKYNYay-YMRH0_dKAg8JbTiiQ@mail.gmail.com>
Date: Mon, 4 Sep 2017 20:10:00 +0100
From: Ard Biesheuvel <ard.biesheuvel@...aro.org>
To: Nicolas Pitre <nicolas.pitre@...aro.org>
Cc: "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>, Arnd Bergmann <arnd@...db.de>,
Russell King <linux@...linux.org.uk>, Kees Cook <keescook@...omium.org>,
Thomas Garnier <thgarnie@...gle.com>, Marc Zyngier <marc.zyngier@....com>,
Mark Rutland <mark.rutland@....com>, Tony Lindgren <tony@...mide.com>,
Matt Fleming <matt@...eblueprint.co.uk>, Dave Martin <dave.martin@....com>
Subject: Re: [PATCH v2 19/29] ARM: kernel: make vmlinux buildable as a PIE executable
On 4 September 2017 at 19:11, Nicolas Pitre <nicolas.pitre@...aro.org> wrote:
> On Sun, 3 Sep 2017, Ard Biesheuvel wrote:
>
>> Update the build flags and linker script to allow vmlinux to be built
>> as a PIE binary, which retains relocation information about absolute
>> symbol references so that they can be fixed up at runtime. This will
>> be used for implementing KASLR,
>>
>> Cc: Russell King <linux@...linux.org.uk>
>> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
>> ---
>> arch/arm/Kconfig | 4 ++++
>> arch/arm/Makefile | 5 +++++
>> arch/arm/include/asm/assembler.h | 2 +-
>> arch/arm/kernel/vmlinux.lds.S | 9 +++++++++
>> include/linux/hidden.h | 20 ++++++++++++++++++++
>> scripts/module-common.lds | 1 +
>> 6 files changed, 40 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
>> index 61a0cb15067e..300add3b8023 100644
>> --- a/arch/arm/Kconfig
>> +++ b/arch/arm/Kconfig
>> @@ -2085,6 +2085,10 @@ config DMI
>> firmware need to be enabled. This would require the DMI subsystem
>> to be enabled much earlier than we do on ARM, which is non-trivial.
>>
>> +config RELOCATABLE
>> + bool
>> + select HAVE_ARCH_PREL32_RELOCATIONS
>> +
>
> You should probably make it depend on !XIP_KERNEL.
>
Indeed.
> Other than that
>
> Acked-by: Nicolas Pitre <nico@...aro.org>
>
Thanks.
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