Re: [GIT PULL] hardening fixes for v6.6-rc3

[Linus Torvalds]

On Fri, 22 Sept 2023 at 09:59, Kees Cook <keescook@xxxxxxxxxxxx> wrote:
>
> - Fix UAPI stddef.h to avoid C++-ism (Alexey Dobriyan)

Ugh. Did we really have to make two different versions of that define?

Ok, so C++ did something stupid wrt an empty struct. Fine.

But I think we could have still shared the same definition by just
using the same 'zero-sized array' trick, regardless of any 'empty
struct has a size in C++'.

IOW, wouldn't this just work universally, without any "two completely
different versions" hack?

#define __DECLARE_FLEX_ARRAY(TYPE, NAME)        \
        struct { \
                char __empty_ ## NAME[0]; \
                TYPE NAME[]; \
        }

I didn't test. I'm just hating on that '#ifdef __cplusplus'.

                   Linus