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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2021-11-01 17:09:03 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-11-01 17:09:03 -0700 |
| commit | f594e28d805aca2c6e158cc647f133cab58a8bb4 (patch) | |
| tree | bbc6044de5bc18185c0de5318fc0d2890f9a32d8 /security | |
| parent | 01463374c50e4fe75abec927fa231f8f5d701852 (diff) | |
| parent | 6425392acf24b6d469932dd1b217dc7b20d6447f (diff) | |
| download | lwn-f594e28d805aca2c6e158cc647f133cab58a8bb4.tar.gz lwn-f594e28d805aca2c6e158cc647f133cab58a8bb4.zip | |
Merge tag 'hardening-v5.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
Pull compiler hardening updates from Kees Cook:
"These are various compiler-related hardening feature updates. Notable
is the addition of an explicit limited rationale for, and deprecation
schedule of, gcc-plugins.
gcc-plugins:
- remove support for GCC 4.9 and older (Ard Biesheuvel)
- remove duplicate include in gcc-common.h (Ye Guojin)
- Explicitly document purpose and deprecation schedule (Kees Cook)
- Remove cyc_complexity (Kees Cook)
instrumentation:
- Avoid harmless Clang option under CONFIG_INIT_STACK_ALL_ZERO (Kees Cook)
Clang LTO:
- kallsyms: strip LTO suffixes from static functions (Nick Desaulniers)"
* tag 'hardening-v5.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
gcc-plugins: remove duplicate include in gcc-common.h
gcc-plugins: Remove cyc_complexity
gcc-plugins: Explicitly document purpose and deprecation schedule
kallsyms: strip LTO suffixes from static functions
gcc-plugins: remove support for GCC 4.9 and older
hardening: Avoid harmless Clang option under CONFIG_INIT_STACK_ALL_ZERO
Diffstat (limited to 'security')
| -rw-r--r-- | security/Kconfig.hardening | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/security/Kconfig.hardening b/security/Kconfig.hardening index 90cbaff86e13..d051f8ceefdd 100644 --- a/security/Kconfig.hardening +++ b/security/Kconfig.hardening @@ -23,13 +23,16 @@ config CC_HAS_AUTO_VAR_INIT_PATTERN def_bool $(cc-option,-ftrivial-auto-var-init=pattern) config CC_HAS_AUTO_VAR_INIT_ZERO + # GCC ignores the -enable flag, so we can test for the feature with + # a single invocation using the flag, but drop it as appropriate in + # the Makefile, depending on the presence of Clang. def_bool $(cc-option,-ftrivial-auto-var-init=zero -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang) choice prompt "Initialize kernel stack variables at function entry" default GCC_PLUGIN_STRUCTLEAK_BYREF_ALL if COMPILE_TEST && GCC_PLUGINS default INIT_STACK_ALL_PATTERN if COMPILE_TEST && CC_HAS_AUTO_VAR_INIT_PATTERN - default INIT_STACK_ALL_ZERO if CC_HAS_AUTO_VAR_INIT_PATTERN + default INIT_STACK_ALL_ZERO if CC_HAS_AUTO_VAR_INIT_ZERO default INIT_STACK_NONE help This option enables initialization of stack variables at @@ -53,7 +56,8 @@ choice config GCC_PLUGIN_STRUCTLEAK_USER bool "zero-init structs marked for userspace (weak)" - depends on GCC_PLUGINS + # Plugin can be removed once the kernel only supports GCC 12+ + depends on GCC_PLUGINS && !CC_HAS_AUTO_VAR_INIT_ZERO select GCC_PLUGIN_STRUCTLEAK help Zero-initialize any structures on the stack containing @@ -64,7 +68,8 @@ choice config GCC_PLUGIN_STRUCTLEAK_BYREF bool "zero-init structs passed by reference (strong)" - depends on GCC_PLUGINS + # Plugin can be removed once the kernel only supports GCC 12+ + depends on GCC_PLUGINS && !CC_HAS_AUTO_VAR_INIT_ZERO depends on !(KASAN && KASAN_STACK) select GCC_PLUGIN_STRUCTLEAK help @@ -82,7 +87,8 @@ choice config GCC_PLUGIN_STRUCTLEAK_BYREF_ALL bool "zero-init everything passed by reference (very strong)" - depends on GCC_PLUGINS + # Plugin can be removed once the kernel only supports GCC 12+ + depends on GCC_PLUGINS && !CC_HAS_AUTO_VAR_INIT_ZERO depends on !(KASAN && KASAN_STACK) select GCC_PLUGIN_STRUCTLEAK help |