diff options
| author | Kees Cook <keescook@chromium.org> | 2013-12-19 19:35:58 (GMT) |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-12-20 08:38:40 (GMT) |
| commit | 19952a92037e752f9d3bbbad552d596f9a56e146 (patch) | |
| tree | 8a1930b4775cb17865c03faf55eafdd7b97be8ba /arch/x86 | |
| parent | b0031f227e47919797dc0e1c1990f3ef151ff0cc (diff) | |
| download | linux-19952a92037e752f9d3bbbad552d596f9a56e146.tar.xz | |
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>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/Kconfig | 17 | ||||
| -rw-r--r-- | arch/x86/Makefile | 8 |
2 files changed, 4 insertions, 21 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 0952ecd..838e7c3 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 diff --git a/arch/x86/Makefile b/arch/x86/Makefile index 57d0215..13b22e0 100644 --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -89,13 +89,11 @@ else KBUILD_CFLAGS += -maccumulate-outgoing-args endif +# Make sure compiler does not have buggy stack-protector support. ifdef CONFIG_CC_STACKPROTECTOR cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh - ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y) - stackp-y := -fstack-protector - KBUILD_CFLAGS += $(stackp-y) - else - $(warning stack protector enabled but no compiler support) + ifneq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y) + $(warning stack-protector enabled but compiler support broken) endif endif |