stackprotector: Unify the HAVE_CC_STACKPROTECTOR logic between architectures

Instead of duplicating the CC_STACKPROTECTOR Kconfig and
Makefile logic in each architecture, switch to using
HAVE_CC_STACKPROTECTOR and keep everything in one place. This
retains the x86-specific bug verification scripts.

Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Michal Marek <mmarek@suse.cz>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Shawn Guo <shawn.guo@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-mips@linux-mips.org
Cc: linux-arch@vger.kernel.org
Link: http://lkml.kernel.org/r/1387481759-14535-2-git-send-email-keescook@chromium.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 1 insertions, 16 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 0952ecd60eca..838e7c34dd60 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -125,6 +125,7 @@ config X86
         select RTC_LIB
         select HAVE_DEBUG_STACKOVERFLOW
         select HAVE_IRQ_EXIT_ON_IRQ_STACK if X86_64
+        select HAVE_CC_STACKPROTECTOR
 
 config INSTRUCTION_DECODER
         def_bool y
@@ -1617,22 +1618,6 @@ config SECCOMP
 
           If unsure, say Y. Only embedded should say N here.
 
-config CC_STACKPROTECTOR
-        bool "Enable -fstack-protector buffer overflow detection"
-        ---help---
-          This option turns on the -fstack-protector GCC feature. This
-          feature puts, at the beginning of functions, a canary value on
-          the stack just before the return address, and validates
-          the value just before actually returning.  Stack based buffer
-          overflows (that need to overwrite this return address) now also
-          overwrite the canary, which gets detected and the attack is then
-          neutralized via a kernel panic.
-
-          This feature requires gcc version 4.2 or above, or a distribution
-          gcc with the feature backported. Older versions are automatically
-          detected and for those versions, this configuration option is
-          ignored. (and a warning is printed during bootup)
-
 source kernel/Kconfig.hz
 
 config KEXEC