The patch titled
Subject: usercopy: improve comments after reorder
has been removed from the -mm tree. Its filename was
usercopy-no-check-page-span-for-stack-objects-fix.patch
This patch was dropped because it was folded into usercopy-no-check-page-span-for-stack-objects.patch
------------------------------------------------------
From: Kees Cook <keescook@xxxxxxxxxxxx>
Subject: usercopy: improve comments after reorder
This updates the comments to better reflect the order and purpose of
the checks.
Link: http://lkml.kernel.org/r/20190103165151.GA32845@beast
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Qian Cai <cai@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
--- a/mm/usercopy.c~usercopy-no-check-page-span-for-stack-objects-fix
+++ a/mm/usercopy.c
@@ -247,7 +247,8 @@ static DEFINE_STATIC_KEY_FALSE_RO(bypass
/*
* Validates that the given object is:
* - not bogus address
- * - known-safe heap or stack object
+ * - fully contained by stack (or stack frame, when available)
+ * - fully within SLAB object (or object whitelist area, when available)
* - not in kernel text
*/
void __check_object_size(const void *ptr, unsigned long n, bool to_user)
_
Patches currently in -mm which might be from keescook@xxxxxxxxxxxx are
usercopy-no-check-page-span-for-stack-objects.patch
