On Fri, 14 Nov 2025 13:27:47 +0100 Thorsten Blum <[email protected]> wrote:
> Add the __counted_by() compiler attribute to the flexible array member > 'entries' to improve access bounds-checking via CONFIG_UBSAN_BOUNDS and > CONFIG_FORTIFY_SOURCE. > > Signed-off-by: Thorsten Blum <[email protected]> > --- > include/linux/unwind_deferred_types.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/include/linux/unwind_deferred_types.h > b/include/linux/unwind_deferred_types.h > index 33b62ac25c86..d4b67f0116f3 100644 > --- a/include/linux/unwind_deferred_types.h > +++ b/include/linux/unwind_deferred_types.h > @@ -5,7 +5,7 @@ > struct unwind_cache { > unsigned long unwind_completed; > unsigned int nr_entries; > - unsigned long entries[]; > + unsigned long entries[] __counted_by(nr_entries); > }; > > /* Wrong! I need to add a comment here that entries is not bound by nr_entries. https://lore.kernel.org/all/[email protected]/ Maybe this?: diff --git a/include/linux/unwind_deferred_types.h b/include/linux/unwind_deferred_types.h index 33b62ac25c86..d05409bb14fa 100644 --- a/include/linux/unwind_deferred_types.h +++ b/include/linux/unwind_deferred_types.h @@ -5,7 +5,7 @@ struct unwind_cache { unsigned long unwind_completed; unsigned int nr_entries; - unsigned long entries[]; + unsigned long entries[]; /* Fixed size, not bound by nr_entries */ }; /* -- Steve
