Kees Cook 44c6dc940b Makefile: introduce CONFIG_CC_STACKPROTECTOR_AUTO ... Nearly all modern compilers support a stack-protector option, and nearly all modern distributions enable the kernel stack-protector, so enabling this by default in kernel builds would make sense. However, Kconfig does not have knowledge of available compiler features, so it isn't safe to force on, as this would unconditionally break builds for the compilers or architectures that don't have support. Instead, this introduces a new option, CONFIG_CC_STACKPROTECTOR_AUTO, which attempts to discover the best possible stack-protector available, and will allow builds to proceed even if the compiler doesn't support any stack-protector. This option is made the default so that kernels built with modern compilers will be protected-by-default against stack buffer overflows, avoiding things like the recent BlueBorne attack. Selection of a specific stack-protector option remains available, including disabling it. Additionally, tiny.config is adjusted to use CC_STACKPROTECTOR_NONE, since that's the option with the least code size (and it used to be the default, so we have to explicitly choose it there now). Link: http://lkml.kernel.org/r/1510076320-69931-4-git-send-email-keescook@chromium.org Signed-off-by: Kees Cook <keescook@chromium.org> Tested-by: Laura Abbott <labbott@redhat.com> Cc: Masahiro Yamada <yamada.masahiro@socionext.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2018-02-06 18:32:44 -08:00
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alpha	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mattst88/alpha	2018-02-02 13:46:21 -08:00
arc	The core framework has a handful of patches this time around, mostly due	2018-02-01 16:56:07 -08:00
arm	Merge branch 'i2c/for-4.16' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux	2018-02-04 10:57:43 -08:00
arm64	kasan: clean up KASAN_SHADOW_SCALE_SHIFT usage	2018-02-06 18:32:43 -08:00
blackfin	The core framework has a handful of patches this time around, mostly due	2018-02-01 16:56:07 -08:00
c6x	The core framework has a handful of patches this time around, mostly due	2018-02-01 16:56:07 -08:00
cris	The core framework has a handful of patches this time around, mostly due	2018-02-01 16:56:07 -08:00
frv	The core framework has a handful of patches this time around, mostly due	2018-02-01 16:56:07 -08:00
h8300	The core framework has a handful of patches this time around, mostly due	2018-02-01 16:56:07 -08:00
hexagon	The core framework has a handful of patches this time around, mostly due	2018-02-01 16:56:07 -08:00
ia64	The core framework has a handful of patches this time around, mostly due	2018-02-01 16:56:07 -08:00
m32r	The core framework has a handful of patches this time around, mostly due	2018-02-01 16:56:07 -08:00
m68k	The core framework has a handful of patches this time around, mostly due	2018-02-01 16:56:07 -08:00
metag	The core framework has a handful of patches this time around, mostly due	2018-02-01 16:56:07 -08:00
microblaze	Microblaze patches for 4.16-rc1	2018-02-02 09:48:36 -08:00
mips	The core framework has a handful of patches this time around, mostly due	2018-02-01 16:56:07 -08:00
mn10300	The core framework has a handful of patches this time around, mostly due	2018-02-01 16:56:07 -08:00
nios2	The core framework has a handful of patches this time around, mostly due	2018-02-01 16:56:07 -08:00
openrisc	The core framework has a handful of patches this time around, mostly due	2018-02-01 16:56:07 -08:00
parisc	The core framework has a handful of patches this time around, mostly due	2018-02-01 16:56:07 -08:00
powerpc	powerpc updates for 4.16	2018-02-02 10:01:04 -08:00
riscv	The core framework has a handful of patches this time around, mostly due	2018-02-01 16:56:07 -08:00
s390	The core framework has a handful of patches this time around, mostly due	2018-02-01 16:56:07 -08:00
score	The core framework has a handful of patches this time around, mostly due	2018-02-01 16:56:07 -08:00
sh	The core framework has a handful of patches this time around, mostly due	2018-02-01 16:56:07 -08:00
sparc	The core framework has a handful of patches this time around, mostly due	2018-02-01 16:56:07 -08:00
tile	The core framework has a handful of patches this time around, mostly due	2018-02-01 16:56:07 -08:00
um	The core framework has a handful of patches this time around, mostly due	2018-02-01 16:56:07 -08:00
unicore32	The core framework has a handful of patches this time around, mostly due	2018-02-01 16:56:07 -08:00
x86	Makefile: move stack-protector availability out of Kconfig	2018-02-06 18:32:44 -08:00
xtensa	The core framework has a handful of patches this time around, mostly due	2018-02-01 16:56:07 -08:00
.gitignore
Kconfig	Makefile: introduce CONFIG_CC_STACKPROTECTOR_AUTO	2018-02-06 18:32:44 -08:00