On Fri, Sep 22, 2023 at 10:54:37AM -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 ssam_event. > > [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci > > Cc: Maximilian Luz <luzmaximilian@xxxxxxxxx> > Cc: platform-driver-x86@xxxxxxxxxxxxxxx > Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx> Reviewed-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx> Thanks -- Gustavo > --- > include/linux/surface_aggregator/controller.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/include/linux/surface_aggregator/controller.h b/include/linux/surface_aggregator/controller.h > index cb7980805920..5b67f0f47d80 100644 > --- a/include/linux/surface_aggregator/controller.h > +++ b/include/linux/surface_aggregator/controller.h > @@ -44,7 +44,7 @@ struct ssam_event { > u8 command_id; > u8 instance_id; > u16 length; > - u8 data[]; > + u8 data[] __counted_by(length); > }; > > /** > -- > 2.34.1 > >
