linux-kernel - Re: [PATCH 1/2] arm64: setup: introduce kaslr

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Date:   Thu, 22 Dec 2016 11:48:58 +0530
From:   Yury Norov <ynorov@...iumnetworks.com>
To:     Alexander Popov <alex.popov@...ux.com>
CC:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh@...nel.org>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        AKASHI Takahiro <takahiro.akashi@...aro.org>,
        Jon Masters <jcm@...hat.com>,
        David Daney <david.daney@...ium.com>,
        Ganapatrao Kulkarni <gkulkarni@...iumnetworks.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Nicolai Stange <nicstange@...il.com>,
        James Morse <james.morse@....com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: [PATCH 1/2] arm64: setup: introduce kaslr_offset()

On Sun, Dec 11, 2016 at 03:50:55AM +0300, Alexander Popov wrote:
> Introduce kaslr_offset() similarly to x86_64 for fixing kcov.
> 
> Signed-off-by: Alexander Popov <alex.popov@...ux.com>
> ---
>  arch/arm64/include/asm/setup.h      | 19 +++++++++++++++++++
>  arch/arm64/include/uapi/asm/setup.h |  4 ++--
>  arch/arm64/kernel/setup.c           |  8 ++++----
>  3 files changed, 25 insertions(+), 6 deletions(-)
>  create mode 100644 arch/arm64/include/asm/setup.h
> 
> diff --git a/arch/arm64/include/asm/setup.h b/arch/arm64/include/asm/setup.h
> new file mode 100644
> index 0000000..e7b59b9
> --- /dev/null
> +++ b/arch/arm64/include/asm/setup.h
> @@ -0,0 +1,19 @@
> +/*
> + * arch/arm64/include/asm/setup.h
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#ifndef __ASM_SETUP_H
> +#define __ASM_SETUP_H
> +
> +#include <uapi/asm/setup.h>
> +
> +static inline unsigned long kaslr_offset(void)
> +{
> +	return kimage_vaddr - KIMAGE_VADDR;
> +}
> +
> +#endif

Hi Alexander,

I found today's linux-next master broken:
In file included from init/main.c:88:0:
./arch/arm64/include/asm/setup.h:14:100: error: redefinition of ‘kaslr_offset’
In file included from ./arch/arm64/include/asm/page.h:54:0,
   from ./include/linux/mm_types.h:16,
   from ./include/linux/sched.h:27,
   from ./arch/arm64/include/asm/compat.h:25,
   from ./arch/arm64/include/asm/stat.h:23,
   from ./include/linux/stat.h:5,
   from ./include/linux/module.h:10,
   from init/main.c:15:
/arch/arm64/include/asm/memory.h:168:100: note: previous definition of ‘kaslr_offset’ was here scripts/Makefile.build:293: recipe for target 'init/main.o' failed
make[1]: *** [init/main.o] Error 1

It looks like you declare kaslr_offset() twice - in this patch, and in 7ede8665f
(arm64: setup: introduce kaslr_offset()). 

Yury