[PATCH (sh-2.6) 1/2] sh: add stack smashing protection support

[Paul Mundt]

On Tue, Dec 07, 2010 at 03:15:23PM -0500, Mike Frysinger wrote:
> On Tuesday, December 07, 2010 05:20:53 Filippo ARCIDIACONO wrote:
> > Add stack smashing suppurt for SH architecture. This is based on work
> > from Nicolas Pitre for ARM (c743f38013aeff58ef6252601e397b5ba281c633).
> > Use the ARM boot_init_stack_canary function to initialize the guard
> > canary. It has been placed under asm-generic to allow archtectures
> > based on __stack_chk_guard to use a common implementation.
> > Update the __stack_chk_guard global variable with the value stored in
> > the task struct whenever a task switch occurs to allow for different
> > canary values per task. This cannot work on SMP where the initial
> > canary value is always used.
> > 
> >  arch/sh/Kconfig                      |   13 +++++++++++
> >  arch/sh/Makefile                     |    4 +++
> >  arch/sh/include/asm/stackprotector.h |   10 ++++++++
> >  arch/sh/kernel/process_32.c          |    9 +++++++
> >  include/asm-generic/stackprotector.h |   39
> 
> if you're starting asm-generic stuff, why not go the distance and do it all in 
> common code ?  your sh/Kconfig and sh/Makefile changes arent specific to 
> SuperH, nor is the symbol in process_32.c.

Indeed. It would be nice to simply shove this in to lib/ with the
Makefile bits in the top-level Makefile.