The patch titled
Subject: mm/memcg: annotate struct mem_cgroup_threshold_ary with __counted_by
has been added to the -mm mm-unstable branch. Its filename is
mm-memcg-annotate-struct-mem_cgroup_threshold_ary-with-__counted_by.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-memcg-annotate-struct-mem_cgroup_threshold_ary-with-__counted_by.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Kees Cook <keescook@xxxxxxxxxxxx>
Subject: mm/memcg: annotate struct mem_cgroup_threshold_ary with __counted_by
Date: Fri, 22 Sep 2023 10:53:28 -0700
Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).
As found with Coccinelle[1], add __counted_by for struct
mem_cgroup_threshold_ary.
[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
Link: https://lkml.kernel.org/r/20230922175327.work.985-kees@xxxxxxxxxx
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Shakeel Butt <shakeelb@xxxxxxxxxx>
Cc: Roman Gushchin <roman.gushchin@xxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/memcontrol.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/linux/memcontrol.h~mm-memcg-annotate-struct-mem_cgroup_threshold_ary-with-__counted_by
+++ a/include/linux/memcontrol.h
@@ -143,7 +143,7 @@ struct mem_cgroup_threshold_ary {
/* Size of entries[] */
unsigned int size;
/* Array of thresholds */
- struct mem_cgroup_threshold entries[];
+ struct mem_cgroup_threshold entries[] __counted_by(size);
};
struct mem_cgroup_thresholds {
_
Patches currently in -mm which might be from keescook@xxxxxxxxxxxx are
mm-memcg-annotate-struct-mem_cgroup_threshold_ary-with-__counted_by.patch
