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mm/memcg: annotate struct mem_cgroup_threshold_ary with __counted_by

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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@kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Roman Gushchin <roman.gushchin@linux.dev>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kees Cook 2023-09-22 10:53:28 -07:00 committed by Andrew Morton
parent 30a89adf87
commit b7c6720659
1 changed files with 1 additions and 1 deletions
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2
include/linux/memcontrol.h
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@ -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 {