On 9/22/23 11:50, Kees Cook wrote:
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
Cc: Dmitry Torokhov <[email protected]>
Cc: [email protected]
Signed-off-by: Kees Cook <[email protected]>
Reviewed-by: Gustavo A. R. Silva <[email protected]>
Thanks
--
Gustavo
---
drivers/input/evdev.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index 95f90699d2b1..51e0c4954600 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)
