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Now that IPC and other changes have landed, enable manual markings for

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randstruct plugin, including the task_struct.
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 Comment: Kees Cook <kees@outflux.net>
 
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Merge tag 'gcc-plugins-v4.13-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull structure randomization updates from Kees Cook:
 "Now that IPC and other changes have landed, enable manual markings for
  randstruct plugin, including the task_struct.

  This is the rest of what was staged in -next for the gcc-plugins, and
  comes in three patches, largest first:

   - mark "easy" structs with __randomize_layout

   - mark task_struct with an optional anonymous struct to isolate the
     __randomize_layout section

   - mark structs to opt _out_ of automated marking (which will come
     later)

  And, FWIW, this continues to pass allmodconfig (normal and patched to
  enable gcc-plugins) builds of x86_64, i386, arm64, arm, powerpc, and
  s390 for me"

* tag 'gcc-plugins-v4.13-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  randstruct: opt-out externally exposed function pointer structs
  task_struct: Allow randomized layout
  randstruct: Mark various structs for randomization
This commit is contained in:
Linus Torvalds 2017-07-19 08:55:18 -07:00
commit e06fdaf40a
42 changed files with 97 additions and 66 deletions
Download patch file Download diff file Expand all files Collapse all files

4
include/linux/module.h
View file

@ -45,7 +45,7 @@ struct module_kobject {
struct kobject *drivers_dir;
struct module_param_attrs *mp;
struct completion *kobj_completion;
};
} __randomize_layout;
struct module_attribute {
struct attribute attr;
@ -475,7 +475,7 @@ struct module {
ctor_fn_t *ctors;
unsigned int num_ctors;
#endif
} ____cacheline_aligned;
} ____cacheline_aligned __randomize_layout;
#ifndef MODULE_ARCH_INIT
#define MODULE_ARCH_INIT {}
#endif