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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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40
mm/slub.c
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@ -3764,6 +3764,46 @@ void *__kmalloc_node(size_t size, gfp_t flags, int node)
EXPORT_SYMBOL(__kmalloc_node);
#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 *s;
unsigned long offset;
size_t object_size;
/* Find object and usable object size. */
s = page->slab_cache;
object_size = slab_ksize(s);
/* Reject impossible pointers. */
if (ptr < page_address(page))
return s->name;
/* Find offset within object. */
offset = (ptr - page_address(page)) % s->size;
/* Adjust for redzone and reject if within the redzone. */
if (kmem_cache_debug(s) && s->flags & SLAB_RED_ZONE) {
if (offset < s->red_left_pad)
return s->name;
offset -= s->red_left_pad;
}
/* Allow address range falling entirely within object size. */
if (offset <= object_size && n <= object_size - offset)
return NULL;
return s->name;
}
#endif /* CONFIG_HARDENED_USERCOPY */
static size_t __ksize(const void *object)
{
struct page *page;