# git rev-parse -q --verify 050e9baa9dc9fbd9ce2b27f0056990fc9e0a08a0^{commit}
050e9baa9dc9fbd9ce2b27f0056990fc9e0a08a0
already have revision, skipping fetch
# git checkout -q -f -B kisskb 050e9baa9dc9fbd9ce2b27f0056990fc9e0a08a0
# git clean -qxdf
# < git log -1
# commit 050e9baa9dc9fbd9ce2b27f0056990fc9e0a08a0
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Thu Jun 14 12:21:18 2018 +0900
# 
#     Kbuild: rename CC_STACKPROTECTOR[_STRONG] config variables
#     
#     The changes to automatically test for working stack protector compiler
#     support in the Kconfig files removed the special STACKPROTECTOR_AUTO
#     option that picked the strongest stack protector that the compiler
#     supported.
#     
#     That was all a nice cleanup - it makes no sense to have the AUTO case
#     now that the Kconfig phase can just determine the compiler support
#     directly.
#     
#     HOWEVER.
#     
#     It also meant that doing "make oldconfig" would now _disable_ the strong
#     stackprotector if you had AUTO enabled, because in a legacy config file,
#     the sane stack protector configuration would look like
#     
#       CONFIG_HAVE_CC_STACKPROTECTOR=y
#       # CONFIG_CC_STACKPROTECTOR_NONE is not set
#       # CONFIG_CC_STACKPROTECTOR_REGULAR is not set
#       # CONFIG_CC_STACKPROTECTOR_STRONG is not set
#       CONFIG_CC_STACKPROTECTOR_AUTO=y
#     
#     and when you ran this through "make oldconfig" with the Kbuild changes,
#     it would ask you about the regular CONFIG_CC_STACKPROTECTOR (that had
#     been renamed from CONFIG_CC_STACKPROTECTOR_REGULAR to just
#     CONFIG_CC_STACKPROTECTOR), but it would think that the STRONG version
#     used to be disabled (because it was really enabled by AUTO), and would
#     disable it in the new config, resulting in:
#     
#       CONFIG_HAVE_CC_STACKPROTECTOR=y
#       CONFIG_CC_HAS_STACKPROTECTOR_NONE=y
#       CONFIG_CC_STACKPROTECTOR=y
#       # CONFIG_CC_STACKPROTECTOR_STRONG is not set
#       CONFIG_CC_HAS_SANE_STACKPROTECTOR=y
#     
#     That's dangerously subtle - people could suddenly find themselves with
#     the weaker stack protector setup without even realizing.
#     
#     The solution here is to just rename not just the old RECULAR stack
#     protector option, but also the strong one.  This does that by just
#     removing the CC_ prefix entirely for the user choices, because it really
#     is not about the compiler support (the compiler support now instead
#     automatially impacts _visibility_ of the options to users).
#     
#     This results in "make oldconfig" actually asking the user for their
#     choice, so that we don't have any silent subtle security model changes.
#     The end result would generally look like this:
#     
#       CONFIG_HAVE_CC_STACKPROTECTOR=y
#       CONFIG_CC_HAS_STACKPROTECTOR_NONE=y
#       CONFIG_STACKPROTECTOR=y
#       CONFIG_STACKPROTECTOR_STRONG=y
#       CONFIG_CC_HAS_SANE_STACKPROTECTOR=y
#     
#     where the "CC_" versions really are about internal compiler
#     infrastructure, not the user selections.
#     
#     Acked-by: Masahiro Yamada <yamada.masahiro@socionext.com>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux-gcc --version
# < git log --format=%s --max-count=1 050e9baa9dc9fbd9ce2b27f0056990fc9e0a08a0
# < make -s -j 10 ARCH=um O=/kisskb/build/linus_um-defconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 defconfig
# make -s -j 10 ARCH=um O=/kisskb/build/linus_um-defconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 
/kisskb/src/arch/um/os-Linux/skas/process.c: In function 'start_idle_thread':
/kisskb/src/arch/um/os-Linux/skas/process.c:613:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
/kisskb/src/net/core/rtnetlink.c: In function 'rtnl_newlink':
/kisskb/src/net/core/rtnetlink.c:3099:1: warning: the frame size of 1280 bytes is larger than 1024 bytes [-Wframe-larger-than=]
 }
 ^
  LINK linux
Completed OK
# rm -rf /kisskb/build/linus_um-defconfig_um-x86_64
# Build took: 0:01:18.272124