bootx_init.c:88: undefined reference to `__stack_chk_fail_local'

[Christian Kujau]

On Wed, 4 Jan 2017, Christian Kujau wrote:
> So, would the following be sufficient? It compiles, but I haven't had a 
> chance to boot yet.
> 

So, with -fno-stack-protector my GCC 4.9.2 compiles with 
CC_STACKPROTECTOR_STRONG=y but panics during boot:


Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: c069278c
CPU: 0 PIP: 591 Comm: systemd Tainted: G       W      4.10.0-rc3-dirty
Call Trace:
[ee965bb0] [c0693f5c] panic+0x120/0x274 (unreliable)
[ee965c10] [c002c568] print_tainted+0x0/0xcc
[ee965c20] [c069278c] schedule_timeout+0x25c/0x280
[ee965c80] [c068cc30] io_schedule_timeout+0x90/0xf4
[ee965ca0] [c00ac870] wait_on_page_bit_killable+0x1Oc/0x170
[ee965cf0] [c00ad240] __lock_page_or_retry+0xd4/0x12c
[ee965d10] [c00ad708] filemap_fault+0x470/0x5b0
[ee965d60] [c00d07c8] __do_fault+0x2c/0x90
[ee965e40] [c00d4104] handle_mm__fault+0x7c0/0x9cc
[ee965e00] [c0015a6c] do_page_fault+0x2ec,0x5b4
[ee965e40] [c0011660] handle_page_fault+0xc/0x80
--- interrupt: 301 at do_page_fault+0x394/0x5b4
    LR = do_page_fault+0x378,0x5b4
[ee965f00] [c0015c04] do_page_fault+0x484/0x5b4 (unreliable)
[ee965f40] [c0011660] handle_page_fault+0xc/0x80
--- interrupt: 401 at 0x2074d000
    LR = 0x207cff0


Maybe ppc32 is not supposed to be built with CC_STACKPROTECTOR ?

Thanks,
Christian.

> 
> diff --git a/arch/powerpc/platforms/powermac/Makefile b/arch/powerpc/platforms/powermac/Makefile
> index 1eb7b45..c7dcab9 100644
> --- a/arch/powerpc/platforms/powermac/Makefile
> +++ b/arch/powerpc/platforms/powermac/Makefile
> @@ -1,4 +1,4 @@
> -CFLAGS_bootx_init.o  		+= -fPIC
> +CFLAGS_bootx_init.o  		+= -fPIC -fno-stack-protector
>  
>  ifdef CONFIG_FUNCTION_TRACER
>  # Do not trace early boot code
> 
> 
> Thanks,
> Christian.
> -- 
> BOFH excuse #156:
> 
> Zombie processes haunting the computer
> 

-- 
BOFH excuse #450:

Terrorists crashed an airplane into the server room, have to remove /bin/laden. (rm -rf /bin/laden)