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- expand the arm64 vmalloc check to include skipping the module space too

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Merge tag 'usercopy-v4.8-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull usercopy hardening fix from Kees Cook:
 "Expand the arm64 vmalloc check to include skipping the module space
  too"

* tag 'usercopy-v4.8-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  mm: usercopy: Check for module addresses
This commit is contained in:
Linus Torvalds 2016-09-20 17:11:19 -07:00
commit 7d1e042314
1 changed files with 4 additions and 1 deletions
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5
mm/usercopy.c
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@ -207,8 +207,11 @@ static inline const char *check_heap_object(const void *ptr, unsigned long n,
* Some architectures (arm64) return true for virt_addr_valid() on
* vmalloced addresses. Work around this by checking for vmalloc
* first.
*
* We also need to check for module addresses explicitly since we
* may copy static data from modules to userspace
*/
if (is_vmalloc_addr(ptr))
if (is_vmalloc_or_module_addr(ptr))
return NULL;
if (!virt_addr_valid(ptr))