From: Kees Cook Date: Sat, 30 Sep 2023 16:20:20 +0000 (-0700) Subject: Input: mt - annotate struct input_mt with __counted_by X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=348cbf987ed328682af7d74ce98d9f0e6857f42f;p=linux.git Input: mt - annotate struct input_mt with __counted_by 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 input_mt. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Signed-off-by: Kees Cook Reviewed-by: Gustavo A. R. Silva Link: https://lore.kernel.org/r/20230922175036.work.762-kees@kernel.org Signed-off-by: Dmitry Torokhov --- diff --git a/include/linux/input/mt.h b/include/linux/input/mt.h index 3b8580bd33c14..2cf89a538b18b 100644 --- a/include/linux/input/mt.h +++ b/include/linux/input/mt.h @@ -47,7 +47,7 @@ struct input_mt { unsigned int flags; unsigned int frame; int *red; - struct input_mt_slot slots[]; + struct input_mt_slot slots[] __counted_by(num_slots); }; static inline void input_mt_set_value(struct input_mt_slot *slot,