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Date: Tue, 3 Jan 2017 07:25:16 -0800 (PST)
From: Christian Kujau <lists@nerdbynature.de>
To: Christophe Leroy <christophe.leroy@c-s.fr>
cc: Michael Ellerman <mpe@ellerman.id.au>, linuxppc-dev@lists.ozlabs.org
Subject: bootx_init.c:88: undefined reference to `__stack_chk_fail_local'
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Hi,

when compiling v4.10-rc2 with CONFIG_CC_STACKPROTECTOR_STRONG=y, the 
linker fails with:

================================
+ ld -EB -m elf32ppc -Bstatic --build-id -X -o .tmp_vmlinux1 -T 
./arch/powerpc/kernel/vmlinux.lds arch/powerpc/kernel/head_32.o 
arch/powerpc/kernel/fpu.o arch/powerpc/kernel/vector.o 
arch/powerpc/kernel/prom_init.o init/built-in.o --start-group 
usr/built-in.o arch/powerpc/kernel/built-in.o arch/powerpc/mm/built-in.o 
arch/powerpc/lib/built-in.o arch/powerpc/sysdev/built-in.o 
arch/powerpc/platforms/built-in.o arch/powerpc/math-emu/built-in.o 
arch/powerpc/crypto/built-in.o arch/powerpc/net/built-in.o 
kernel/built-in.o certs/built-in.o mm/built-in.o fs/built-in.o 
ipc/built-in.o security/built-in.o crypto/built-in.o block/built-in.o 
lib/lib.a lib/built-in.o drivers/built-in.o sound/built-in.o 
firmware/built-in.o net/built-in.o virt/built-in.o --end-group
arch/powerpc/platforms/built-in.o: In function `bootx_printf':
/usr/local/src/linux-git/arch/powerpc/platforms/powermac/bootx_init.c:88: undefined reference to `__stack_chk_fail_local'
arch/powerpc/platforms/built-in.o: In function `bootx_add_display_props':
/usr/local/src/linux-git/arch/powerpc/platforms/powermac/bootx_init.c:211: undefined reference to `__stack_chk_fail_local'
arch/powerpc/platforms/built-in.o: In function 
`bootx_scan_dt_build_struct':
/usr/local/src/linux-git/arch/powerpc/platforms/powermac/bootx_init.c:350: undefined reference to `__stack_chk_fail_local'
arch/powerpc/platforms/built-in.o: In function `bootx_init':
/usr/local/src/linux-git/arch/powerpc/platforms/powermac/bootx_init.c:596: undefined reference to `__stack_chk_fail_local'
/usr/bin/ld.bfd.real: .tmp_vmlinux1: hidden symbol `__stack_chk_fail_local' isn't defined
/usr/bin/ld.bfd.real: final link failed: Bad value
================================


$ ld --version | head -1
GNU ld (GNU Binutils for Debian) 2.25

$ gcc --version | head -1
gcc-4.9.real (Debian 4.9.2-10) 4.9.2


I'm regularly compiling userspace programs with -fstack-protector w/o 
problems. I suspect it's either 6533b7c16ee5712041b4e324100550e02a9a5dda 
("powerpc: Initial stack protector (-fstack-protector) support") or 
902e06eb86cd62753974c249bd1dedae2825b430 ("powerpc/32: Change the stack 
protector canary value per task") or both but I haven't started the 
bisection yet.

Any other ideas?

Thanks,
Christian.
-- 
BOFH excuse #220:

Someone thought The Big Red Button was a light switch.