The patch titled
Subject: usercopy: improve comments after reorder
has been added to the -mm tree. Its filename is
usercopy-no-check-page-span-for-stack-objects-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/usercopy-no-check-page-span-for-stack-objects-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/usercopy-no-check-page-span-for-stack-objects-fix.patch
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------------------------------------------------------
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>
---
mm/usercopy.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- 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-fix.patch
