Re: [PATCH] wwwdocs: Document ShadowCallStack support

[Jakub Jelinek <jakub@redhat.com>]

On Tue, Feb 22, 2022 at 10:11:06AM +0000, Richard Sandiford via Gcc-patches wrote:
> Document ShadowCallStack support.  The option link doesn't work yet
> of course, but I checked that it works with gcc-12.1.0/ removed.
> 
> OK to install?
> 
> Thanks,
> Richard
> 
> 
> ---
>  htdocs/gcc-12/changes.html | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/htdocs/gcc-12/changes.html b/htdocs/gcc-12/changes.html
> index b6341fda..216ee0b6 100644
> --- a/htdocs/gcc-12/changes.html
> +++ b/htdocs/gcc-12/changes.html
> @@ -96,6 +96,17 @@ a work-in-progress.</p>
>        Note that default vectorizer cost model has been changed which used to behave
>        as <code>-fvect-cost-model=cheap</code> were specified.
>    </li>
> +  <li>
> +    GCC now supports the
> +    <a href="https://clang.llvm.org/docs/ShadowCallStack.html">
> +    ShadowCallStack</a> sanitizer, which can be enabled using the
> +    command-line option
> +    <a href="https://gcc.gnu.org/onlinedocs/gcc-12.1.0/gcc/Instrumentation-Options.html#index-fsanitize_003dshadow-call-stack">
> +    <code>-fshadow-call-stack</code></a>.  This sanitizer currently

The option is -fsanitize=shadow-call-stack , no?

> +    only works on AArch64 targets and it requires an environment in
> +    which all code has been compiled with <code>-ffixed-r18</code>.
> +    Its primary initial user is the Linux kernel.
> +  </li>
>  </ul>
>  

	Jakub