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

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Message-ID: <CAHk-=whf6Zu3Cfm1eOTxXniZf5EPaf1iLj_q_6BVHrzTUBfUGw@mail.gmail.com>
Date: Sat, 23 Sep 2023 11:04:57 -0700
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Kees Cook <keescook@...omium.org>
Cc: linux-kernel@...r.kernel.org, Alexey Dobriyan <adobriyan@...il.com>, 
	linux-hardening@...r.kernel.org
Subject: Re: [GIT PULL] hardening fixes for v6.6-rc3

On Fri, 22 Sept 2023 at 20:49, Kees Cook <keescook@...omium.org> wrote:
>
> 2) __cplusplus is relatively common in UAPI headers already:
>    $ git grep __cplusplus -- include/uapi | wc -l
>    58

Look a bit closer.

Most of those - by far - is for the usual

  #if defined(__cplusplus)
  extern "C" {
  #endif

pattern. IOW, it's explicitly not different code, but telling the C++
compiler that "this is C code".

So this new #ifdef is an ugly new pattern of "do totally different
things for C++".

Apparently required, but very ugly nonetheless.

               Linus