From: Kees Cook Date: Sat, 30 Sep 2023 16:17:43 +0000 (-0700) Subject: Input: evdev - annotate struct evdev_client with __counted_by X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=8927e688e9e0ae625af6a917bace8cc9cac55677;p=linux.git Input: evdev - annotate struct evdev_client 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 evdev_client. [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/20230922175027.work.563-kees@kernel.org Signed-off-by: Dmitry Torokhov --- diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c index 95f90699d2b17..51e0c49546001 100644 --- a/drivers/input/evdev.c +++ b/drivers/input/evdev.c @@ -50,7 +50,7 @@ struct evdev_client { bool revoked; unsigned long *evmasks[EV_CNT]; unsigned int bufsize; - struct input_event buffer[]; + struct input_event buffer[] __counted_by(bufsize); }; static size_t evdev_get_mask_cnt(unsigned int type)