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

From: Christophe LEROY
Date: Wed Sep 26 2018 - 05:41:36 EST

Le 26/09/2018 Ã 11:28, Segher Boessenkool a ÃcritÂ:
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':
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)