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

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Date:	Sat, 22 Nov 2014 08:00:26 -0800
From:	Kees Cook <keescook@...omium.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Chris Clayton <chris2553@...glemail.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Junjie Mao <eternal.n08@...il.com>, x86-ml <x86@...nel.org>
Subject: Re: [PATCH]: cross-compiling x86_64 kernel on i386 user-space fails

On Sat, Nov 22, 2014 at 3:14 AM, Borislav Petkov <bp@...en8.de> wrote:
> 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.

Good catch, thanks!

>
> 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>

Acked-by: Kees Cook <keescook@...omium.org>

-Kees

>
>> ---
>> --- 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 )
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
>> the body of a message to majordomo@...r.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>> Please read the FAQ at  http://www.tux.org/lkml/
>>
>
> --
> Regards/Gruss,
>     Boris.
>
> Sent from a fat crate under my desk. Formatting is fine.
> --



-- 
Kees Cook
Chrome OS Security
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