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Implements HARDENED_USERCOPY verification of copy_to_user/copy_from_user

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bounds checking for most architectures on SLAB and SLUB.
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Merge tag 'usercopy-v4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull usercopy protection from Kees Cook:
 "Tbhis implements HARDENED_USERCOPY verification of copy_to_user and
  copy_from_user bounds checking for most architectures on SLAB and
  SLUB"

* tag 'usercopy-v4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  mm: SLUB hardened usercopy support
  mm: SLAB hardened usercopy support
  s390/uaccess: Enable hardened usercopy
  sparc/uaccess: Enable hardened usercopy
  powerpc/uaccess: Enable hardened usercopy
  ia64/uaccess: Enable hardened usercopy
  arm64/uaccess: Enable hardened usercopy
  ARM: uaccess: Enable hardened usercopy
  x86/uaccess: Enable hardened usercopy
  mm: Hardened usercopy
  mm: Implement stack frame object validation
  mm: Add is_migrate_cma_page
This commit is contained in:
Linus Torvalds 2016-08-08 14:48:14 -07:00
commit 1eccfa090e
28 changed files with 555 additions and 22 deletions
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30
mm/slab.c
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@ -4441,6 +4441,36 @@ static int __init slab_proc_init(void)
module_init(slab_proc_init);
#endif
#ifdef CONFIG_HARDENED_USERCOPY
/*
* Rejects objects that are incorrectly sized.
*
* Returns NULL if check passes, otherwise const char * to name of cache
* to indicate an error.
*/
const char *__check_heap_object(const void *ptr, unsigned long n,
struct page *page)
{
struct kmem_cache *cachep;
unsigned int objnr;
unsigned long offset;
/* Find and validate object. */
cachep = page->slab_cache;
objnr = obj_to_index(cachep, page, (void *)ptr);
BUG_ON(objnr >= cachep->num);
/* Find offset within object. */
offset = ptr - index_to_obj(cachep, page, objnr) - obj_offset(cachep);
/* Allow address range falling entirely within object size. */
if (offset <= cachep->object_size && n <= cachep->object_size - offset)
return NULL;
return cachep->name;
}
#endif /* CONFIG_HARDENED_USERCOPY */
/**
* ksize - get the actual amount of memory allocated for a given object
* @objp: Pointer to the object