diff options
Diffstat (limited to 'scripts/gcc-plugins/Kconfig')
| -rw-r--r-- | scripts/gcc-plugins/Kconfig | 58 |
1 files changed, 47 insertions, 11 deletions
diff --git a/scripts/gcc-plugins/Kconfig b/scripts/gcc-plugins/Kconfig index d45f7f36b859..d0cc92e48f6f 100644 --- a/scripts/gcc-plugins/Kconfig +++ b/scripts/gcc-plugins/Kconfig @@ -67,27 +67,63 @@ config GCC_PLUGIN_LATENT_ENTROPY * https://pax.grsecurity.net/ config GCC_PLUGIN_STRUCTLEAK - bool "Force initialization of variables containing userspace addresses" + bool "Zero initialize stack variables" # Currently STRUCTLEAK inserts initialization out of live scope of # variables from KASAN point of view. This leads to KASAN false # positive reports. Prohibit this combination for now. depends on !KASAN_EXTRA help - This plugin zero-initializes any structures containing a - __user attribute. This can prevent some classes of information - exposures. - - This plugin was ported from grsecurity/PaX. More information at: + 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/ -config GCC_PLUGIN_STRUCTLEAK_BYREF_ALL - bool "Force initialize all struct type variables passed by reference" +choice + prompt "Coverage" depends on GCC_PLUGIN_STRUCTLEAK - depends on !COMPILE_TEST + default GCC_PLUGIN_STRUCTLEAK_BYREF_ALL help - Zero initialize any struct type local variable that may be passed by - reference without having been initialized. + 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" |