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

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Message-ID: <284752d1-6c32-bdca-72d3-4d8616b26fbf@c-s.fr>
Date:   Wed, 26 Sep 2018 11:41:26 +0200
From:   Christophe LEROY <christophe.leroy@....fr>
To:     Segher Boessenkool <segher@...nel.crashing.org>
Cc:     Russell Currey <ruscur@...sell.cc>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        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



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

Does it mean we should add -lssp_nonshared to LDFLAGS_vmlinux ?

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)

Christophe


> 
> :-)
> 
> 
> Segher
>