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Merge branch 'core-stackprotector-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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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
This commit is contained in:
Linus Torvalds 2014-01-20 10:26:31 -08:00
commit ad3ab302fd
11 changed files with 105 additions and 75 deletions
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20
Makefile
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@ -595,10 +595,24 @@ ifneq ($(CONFIG_FRAME_WARN),0)
KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
endif
# Force gcc to behave correct even for buggy distributions
ifndef CONFIG_CC_STACKPROTECTOR
KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
# Handle stack protector mode.
ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
stackp-flag := -fstack-protector
ifeq ($(call cc-option, $(stackp-flag)),)
$(warning Cannot use CONFIG_CC_STACKPROTECTOR: \
-fstack-protector not supported by compiler))
endif
else ifdef CONFIG_CC_STACKPROTECTOR_STRONG
stackp-flag := -fstack-protector-strong
ifeq ($(call cc-option, $(stackp-flag)),)
$(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
-fstack-protector-strong not supported by compiler)
endif
else
# Force off for distro compilers that enable stack protector by default.
stackp-flag := $(call cc-option, -fno-stack-protector)
endif
KBUILD_CFLAGS += $(stackp-flag)
# This warning generated too much noise in a regular build.
# Use make W=1 to enable this warning (see scripts/Makefile.build)