linux-kernel - Re: [PATCH]: cross-compiling x86_64 kernel on i386 user-space fails

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Message-ID: <20141122111444.GA12445@pd.tnic>
Date:	Sat, 22 Nov 2014 12:14:44 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Chris Clayton <chris2553@...glemail.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Junjie Mao <eternal.n08@...il.com>,
	Kees Cook <keescook@...omium.org>, x86-ml <x86@...nel.org>
Subject: Re: [PATCH]: cross-compiling x86_64 kernel on i386 user-space fails

On Sat, Nov 22, 2014 at 09:51:10AM +0000, Chris Clayton wrote:
> Hi,

Yeah, next time make sure you actually CC people :-)

I've added them to CC now.

> Commit e6023367d779060fddc9a52d1f474085b2b36298 broke building an x86_64 kernel in an i386. The change added a call to
> objdump but neglected to cater for cross-compiling.
> 
> The patch below fixes the problem for me. I see the commit is now in 3.14 and 3.17 -stable, so the patch needs to go
> there too.

CC: stable@...r.kernel.org

in the commit message should help there.


> CC: Junjie Mao <eternal.n08@...il.com>
> CC: Kees Cook <keescook@...omium.org>
> CC: Thomas Gleixner <tglx@...utronix.de>
> CC: Ingo Molnar <mingo@...nel.org>
> Signed-off-by: Chris Clayton <chris2553@...glemail.com>

Acked-by: Borislav Petkov <bp@...e.de>

> ---
> --- linux/arch/x86/boot/compressed/Makefile~    2014-11-22 08:56:50.359706324 +0000
> +++ linux/arch/x86/boot/compressed/Makefile     2014-11-22 09:04:06.615693435 +0000
> @@ -76,7 +76,7 @@ suffix-$(CONFIG_KERNEL_XZ)    := xz
>  suffix-$(CONFIG_KERNEL_LZO)    := lzo
>  suffix-$(CONFIG_KERNEL_LZ4)    := lz4
> 
> -RUN_SIZE = $(shell objdump -h vmlinux | \
> +RUN_SIZE = $(shell ${CROSS_COMPILE}objdump -h vmlinux | \
>              perl $(srctree)/arch/x86/tools/calc_run_size.pl)
>  quiet_cmd_mkpiggy = MKPIGGY $@
>        cmd_mkpiggy = $(obj)/mkpiggy $< $(RUN_SIZE) > $@ || ( rm -f $@ ; false )
> 
> --
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-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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