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charset="us-ascii"; Format="flowed" Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" On 8/2/23 00:31, Kees Cook wrote: [...] > Initially I was struggling to make __counted_by work, but it seems we can > use an initializer for that member, as long as we don't touch the flexible > array member in the initializer. So we just need to add the counted-by > member to the macro, and use a union to do the initialization. And if > we take the address of the union (and not the struct within it), the > compiler will see the correct object size with __builtin_object_size: > > #define DEFINE_FLEX(type, name, flex, counter, count) \ > union { \ > u8 bytes[struct_size_t(type, flex, count)]; \ > type obj; \ > } name##_u __aligned(_Alignof(type)) = { .obj.counter = count }; \ > /* take address of whole union to get the correct __builtin_object_size */ \ > type *name = (type *)&name##_u > > i.e. __builtin_object_size(name, 1) (as used by FORTIFY_SOURCE, etc) > works correctly here, but breaks (sees a zero-sized flex array member) > if this macro ends with: > > type *name = &name##_u.obj __builtin_object_size(name, 0) works fine for both versions (with and without .obj at the end) however it does not work for builds without -O2 switch, so struct_size_t() is rather a way to go :/ > > > -Kees > > [1] https://git.kernel.org/linus/dd06e72e68bcb4070ef211be100d2896e236c8fb > _______________________________________________ Intel-wired-lan mailing list Intel-wired-lan@osuosl.org https://lists.osuosl.org/mailman/listinfo/intel-wired-lan