| Message ID | 20230922175036.work.762-kees@kernel.org |
|---|---|
| State | Accepted |
| Commit | 348cbf987ed328682af7d74ce98d9f0e6857f42f |
| Headers | show |
| Series | input: mt: Annotate struct input_mt with __counted_by | expand |
On Fri, Sep 22, 2023 at 10:50:37AM -0700, 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 input_mt. > > [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci > > Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com> > Cc: linux-input@vger.kernel.org > Signed-off-by: Kees Cook <keescook@chromium.org> Applied, thank you.
diff --git a/include/linux/input/mt.h b/include/linux/input/mt.h index 3b8580bd33c1..2cf89a538b18 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,
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 Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com> Cc: linux-input@vger.kernel.org Signed-off-by: Kees Cook <keescook@chromium.org> --- include/linux/input/mt.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)