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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2014-01-20 10:26:31 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-01-20 10:26:31 -0800 |
| commit | ad3ab302fd8239a1ddee01e606683c3197ca6908 (patch) | |
| tree | d4984d29bcc90252118bdf3a0c32d5c1e027fc08 /arch/sh | |
| parent | a693c46e14c9fdadbcd68ddfa94a4f72495531a9 (diff) | |
| parent | 8779657d29c0ebcc0c94ede4df2f497baf1b563f (diff) | |
Merge branch 'core-stackprotector-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull strong stackprotector support from Ingo Molnar:
"This tree adds a CONFIG_CC_STACKPROTECTOR_STRONG=y, a new, stronger
stack canary checking method supported by the newest GCC versions (4.9
and later).
Here's the 'intensity comparison' between the various protection
modes:
- defconfig
11430641 kernel text size
36110 function bodies
- defconfig + CONFIG_CC_STACKPROTECTOR_REGULAR
11468490 kernel text size (+0.33%)
1015 of 36110 functions are stack-protected (2.81%)
- defconfig + CONFIG_CC_STACKPROTECTOR_STRONG via this patch
11692790 kernel text size (+2.24%)
7401 of 36110 functions are stack-protected (20.5%)
the strong model comes with non-trivial costs, which is why we
preserved the 'regular' and 'none' models as well"
* 'core-stackprotector-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
stackprotector: Introduce CONFIG_CC_STACKPROTECTOR_STRONG
stackprotector: Unify the HAVE_CC_STACKPROTECTOR logic between architectures
Diffstat (limited to 'arch/sh')
| -rw-r--r-- | arch/sh/Kconfig | 15 | ||||
| -rw-r--r-- | arch/sh/Makefile | 4 |
2 files changed, 1 insertions, 18 deletions
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig index 9b0979f4df7a..ce298317a73e 100644 --- a/arch/sh/Kconfig +++ b/arch/sh/Kconfig @@ -66,6 +66,7 @@ config SUPERH32 select PERF_EVENTS select ARCH_HIBERNATION_POSSIBLE if MMU select SPARSE_IRQ + select HAVE_CC_STACKPROTECTOR config SUPERH64 def_bool ARCH = "sh64" @@ -695,20 +696,6 @@ config SECCOMP If unsure, say N. -config CC_STACKPROTECTOR - bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)" - depends on SUPERH32 - 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. - config SMP bool "Symmetric multi-processing support" depends on SYS_SUPPORTS_SMP diff --git a/arch/sh/Makefile b/arch/sh/Makefile index aed701c7b11b..d4d16e4be07c 100644 --- a/arch/sh/Makefile +++ b/arch/sh/Makefile @@ -199,10 +199,6 @@ ifeq ($(CONFIG_DWARF_UNWINDER),y) KBUILD_CFLAGS += -fasynchronous-unwind-tables endif -ifeq ($(CONFIG_CC_STACKPROTECTOR),y) - KBUILD_CFLAGS += -fstack-protector -endif - libs-$(CONFIG_SUPERH32) := arch/sh/lib/ $(libs-y) libs-$(CONFIG_SUPERH64) := arch/sh/lib64/ $(libs-y) |