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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2020-08-04 13:38:35 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-08-04 13:38:35 -0700 |
| commit | 5b5d3be5d690a94be390ccf3e4db8dcb7409bf75 (patch) | |
| tree | 3a5a4981e702c4a7db1f74c7c5471db248d509fc /Makefile | |
| parent | 3e4a12a1bafafecaf1631f02099e82b424967718 (diff) | |
| parent | f0fe00d4972a8cd4b98cc2c29758615e4d51cdfe (diff) | |
Merge tag 'var-init-v5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
Pull automatic variable initialization updates from Kees Cook:
"This adds the "zero" init option from Clang, which is being used
widely in production builds of Android and Chrome OS (though it also
keeps the "pattern" init, which is better for debug builds).
- Introduce CONFIG_INIT_STACK_ALL_ZERO (Alexander Potapenko)"
* tag 'var-init-v5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
security: allow using Clang's zero initialization for stack variables
Diffstat (limited to 'Makefile')
| -rw-r--r-- | Makefile | 13 |
1 files changed, 11 insertions, 2 deletions
@@ -803,11 +803,20 @@ KBUILD_CFLAGS += -fomit-frame-pointer endif endif -# Initialize all stack variables with a pattern, if desired. -ifdef CONFIG_INIT_STACK_ALL +# Initialize all stack variables with a 0xAA pattern. +ifdef CONFIG_INIT_STACK_ALL_PATTERN KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern endif +# Initialize all stack variables with a zero value. +ifdef CONFIG_INIT_STACK_ALL_ZERO +# Future support for zero initialization is still being debated, see +# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being +# renamed or dropped. +KBUILD_CFLAGS += -ftrivial-auto-var-init=zero +KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang +endif + DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments) ifdef CONFIG_DEBUG_INFO |