aboutsummaryrefslogtreecommitdiffstats
path: root/scripts/gcc-plugins/Kconfig
diff options
context:
space:
mode:
authorKees Cook <keescook@chromium.org>2019-04-10 08:23:44 -0700
committerKees Cook <keescook@chromium.org>2019-04-24 13:45:49 -0700
commit9f671e58159adea641f76c56d1f0bbdcb3c524ff (patch)
tree0561e3b3a551ef3b1f189a1950980367d8593016 /scripts/gcc-plugins/Kconfig
parentLinux 5.1-rc2 (diff)
downloadlinux-dev-9f671e58159adea641f76c56d1f0bbdcb3c524ff.tar.xz
linux-dev-9f671e58159adea641f76c56d1f0bbdcb3c524ff.zip
security: Create "kernel hardening" config area
Right now kernel hardening options are scattered around various Kconfig files. This can be a central place to collect these kinds of options going forward. This is initially populated with the memory initialization options from the gcc-plugins. Signed-off-by: Kees Cook <keescook@chromium.org> Acked-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Diffstat (limited to 'scripts/gcc-plugins/Kconfig')
-rw-r--r--scripts/gcc-plugins/Kconfig75
1 files changed, 6 insertions, 69 deletions
diff --git a/scripts/gcc-plugins/Kconfig b/scripts/gcc-plugins/Kconfig
index 74271dba4f94..352f03878a1e 100644
--- a/scripts/gcc-plugins/Kconfig
+++ b/scripts/gcc-plugins/Kconfig
@@ -13,17 +13,19 @@ config HAVE_GCC_PLUGINS
An arch should select this symbol if it supports building with
GCC plugins.
-menuconfig GCC_PLUGINS
- bool "GCC plugins"
+config GCC_PLUGINS
+ bool
depends on HAVE_GCC_PLUGINS
depends on PLUGIN_HOSTCC != ""
+ default y
help
GCC plugins are loadable modules that provide extra features to the
compiler. They are useful for runtime instrumentation and static analysis.
See Documentation/gcc-plugins.txt for details.
-if GCC_PLUGINS
+menu "GCC plugins"
+ depends on GCC_PLUGINS
config GCC_PLUGIN_CYC_COMPLEXITY
bool "Compute the cyclomatic complexity of a function" if EXPERT
@@ -66,71 +68,6 @@ config GCC_PLUGIN_LATENT_ENTROPY
* https://grsecurity.net/
* https://pax.grsecurity.net/
-config GCC_PLUGIN_STRUCTLEAK
- bool "Zero initialize stack variables"
- help
- While the kernel is built with warnings enabled for any missed
- stack variable initializations, this warning is silenced for
- anything passed by reference to another function, under the
- occasionally misguided assumption that the function will do
- the initialization. As this regularly leads to exploitable
- flaws, this plugin is available to identify and zero-initialize
- such variables, depending on the chosen level of coverage.
-
- This plugin was originally ported from grsecurity/PaX. More
- information at:
- * https://grsecurity.net/
- * https://pax.grsecurity.net/
-
-choice
- prompt "Coverage"
- depends on GCC_PLUGIN_STRUCTLEAK
- default GCC_PLUGIN_STRUCTLEAK_BYREF_ALL
- help
- This chooses the level of coverage over classes of potentially
- uninitialized variables. The selected class will be
- zero-initialized before use.
-
- config GCC_PLUGIN_STRUCTLEAK_USER
- bool "structs marked for userspace"
- help
- Zero-initialize any structures on the stack containing
- a __user attribute. This can prevent some classes of
- uninitialized stack variable exploits and information
- exposures, like CVE-2013-2141:
- https://git.kernel.org/linus/b9e146d8eb3b9eca
-
- config GCC_PLUGIN_STRUCTLEAK_BYREF
- bool "structs passed by reference"
- help
- Zero-initialize any structures on the stack that may
- be passed by reference and had not already been
- explicitly initialized. This can prevent most classes
- of uninitialized stack variable exploits and information
- exposures, like CVE-2017-1000410:
- https://git.kernel.org/linus/06e7e776ca4d3654
-
- config GCC_PLUGIN_STRUCTLEAK_BYREF_ALL
- bool "anything passed by reference"
- help
- Zero-initialize any stack variables that may be passed
- by reference and had not already been explicitly
- initialized. This is intended to eliminate all classes
- of uninitialized stack variable exploits and information
- exposures.
-
-endchoice
-
-config GCC_PLUGIN_STRUCTLEAK_VERBOSE
- bool "Report forcefully initialized variables"
- depends on GCC_PLUGIN_STRUCTLEAK
- depends on !COMPILE_TEST # too noisy
- help
- This option will cause a warning to be printed each time the
- structleak plugin finds a variable it thinks needs to be
- initialized. Since not all existing initializers are detected
- by the plugin, this can produce false positive warnings.
-
config GCC_PLUGIN_RANDSTRUCT
bool "Randomize layout of sensitive kernel structures"
select MODVERSIONS if MODULES
@@ -226,4 +163,4 @@ config GCC_PLUGIN_ARM_SSP_PER_TASK
bool
depends on GCC_PLUGINS && ARM
-endif
+endmenu