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- For the randstruct plugin, enable automatic randomization of structures

Browse source 
that are entirely function pointers (along with a couple designated
   initializer fixes).
 - For the structleak plugin, provide an option to perform zeroing
   initialization of all otherwise uninitialized stack variables that are
   passed by reference (Ard Biesheuvel).
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 Comment: Kees Cook <[email protected]>
 
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Merge tag 'gcc-plugins-v4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull gcc plugins update from Kees Cook:
 "This finishes the porting work on randstruct, and introduces a new
  option to structleak, both noted below:

   - For the randstruct plugin, enable automatic randomization of
     structures that are entirely function pointers (along with a couple
     designated initializer fixes).

   - For the structleak plugin, provide an option to perform zeroing
     initialization of all otherwise uninitialized stack variables that
     are passed by reference (Ard Biesheuvel)"

* tag 'gcc-plugins-v4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  gcc-plugins: structleak: add option to init all vars used as byref args
  randstruct: Enable function pointer struct detection
  drivers/net/wan/z85230.c: Use designated initializers
  drm/amd/powerplay: rv: Use designated initializers
This commit is contained in:
Linus Torvalds 2017-09-07 20:30:19 -07:00
commit 44ccba3f7b
6 changed files with 44 additions and 30 deletions
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19
arch/Kconfig
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@ -458,6 +458,13 @@ config GCC_PLUGIN_STRUCTLEAK
* https://grsecurity.net/
* https://pax.grsecurity.net/
config GCC_PLUGIN_STRUCTLEAK_BYREF_ALL
bool "Force initialize all struct type variables passed by reference"
depends on GCC_PLUGIN_STRUCTLEAK
help
Zero initialize any struct type local variable that may be passed by
reference without having been initialized.
config GCC_PLUGIN_STRUCTLEAK_VERBOSE
bool "Report forcefully initialized variables"
depends on GCC_PLUGIN_STRUCTLEAK
@ -473,11 +480,13 @@ config GCC_PLUGIN_RANDSTRUCT
depends on GCC_PLUGINS
select MODVERSIONS if MODULES
help
If you say Y here, the layouts of structures explicitly
marked by __randomize_layout will be randomized at
compile-time. This can introduce the requirement of an
additional information exposure vulnerability for exploits
targeting these structure types.
If you say Y here, the layouts of structures that are entirely
function pointers (and have not been manually annotated with
__no_randomize_layout), or structures that have been explicitly
marked with __randomize_layout, will be randomized at compile-time.
This can introduce the requirement of an additional information
exposure vulnerability for exploits targeting these structure
types.
Enabling this feature will introduce some performance impact,
slightly increase memory usage, and prevent the use of forensic