Le 03/01/2017 à 16:25, Christian Kujau a écrit :
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.
Using GCC 5.4.0, I don't have that issue. bootx_init.o only contains
reference to __stack_chk_fail
Looking a bit over internet, some people have reported having
encountered that issue due to old object files not properly cleaned.
Have you tried a 'make clean' or 'distclean' ?
Christophe
