linux-kernel - Re: [PATCH v3 2/2] powerpc/64: add stack protector support

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Date:   Wed, 26 Sep 2018 21:50:59 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Christophe LEROY <christophe.leroy@....fr>,
        Segher Boessenkool <segher@...nel.crashing.org>
Cc:     Russell Currey <ruscur@...sell.cc>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Andrew Donnellan <andrew.donnellan@....ibm.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] powerpc/64: add stack protector support

Christophe LEROY <christophe.leroy@....fr> writes:
> Le 26/09/2018 à 11:28, Segher Boessenkool a écrit :
>> On Wed, Sep 26, 2018 at 09:58:30AM +0200, Christophe LEROY wrote:
>>> Segher, any idea about this problem ?
>> 
>>>>> arch/powerpc/platforms/powermac/bootx_init.o: In function `bootx_printf':
>>>>> /var/lib/jenkins-slave/workspace/snowpatch/snowpatch-linux-
>>>>> sparse/linux/arch/powerpc/platforms/powermac/bootx_init.c:88:
>>>>> undefined reference to `__stack_chk_fail_local'
>> 
>> Are you building as PIC?  Are you linking libssp_nonshared.a?  Why not?
>
> Spotted, thanks.
>
> arch/powerpc/platforms/powermac/Makefile contains:
>
> CFLAGS_bootx_init.o  		+= -fPIC
...
>
> Or maybe stack protection on bootx_init doesn't make much sense and we 
> could just do the following ?
>
> CFLAGS_bootx_init.o  		+= -fPIC $(call cc-option, -fno-stack-protector)

That would be fine by me.

cheers