Re: [PATCH v6 2/2] x86/refcount: Implement fast refcount overflow protection

[Kees Cook]

On Wed, Jul 19, 2017 at 12:37 PM, Josh Poimboeuf <jpoimboe@xxxxxxxxxx> wrote:
> +#define ASM_UNREACHABLE                                                        \
> +       "999: .pushsection .discard.unreachable\n\t"                    \
> +       ".long 999b - .\n\t"                                            \
> +       ".popsection\n\t"

Will this end up running into the same bug fixed with
3d1e236022cc1426b0834565995ddee2ca231cee and the __LINE__ macro? I
could tell under which conditions gcc would do this kind of merging...

-Kees

-- 
Kees Cook
Pixel Security