[PATCH 1/1] NEWS: Add note on Guarded Control Stack support

[Andreas K. Huettel]

In general this is of course ok for the release. See remark below.

Am Dienstag, 21. Januar 2025, 11:57:53 Mitteleuropäische Normalzeit schrieb Yury Khrustalev:
> ---
>  NEWS | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/NEWS b/NEWS
> index b5f15148a0..79a55f3854 100644
> --- a/NEWS
> +++ b/NEWS
> @@ -74,6 +74,17 @@ Major new features:
>    which currently include 'node_id' and 'mm_cid' and will also allow exposing
>    new features as they get added to future Linux kernels.
>  
> +* The GNU C Library now supports Guarded Control Stack extension that allows
> +  to use shadow stacks on AArch64 systems that support this extension.
> +  Building the library with standard branch protection enabled while using
> +  a toolchain that supports GCS (binutils 2.44 and GCC 15 or later), will
> +  enable GCS support in glibc. There is no special configuration flag.
> +  GCS-enabled glibc is compatible with all existing executables and shared
> +  libraries and will run with and without GCS support in the system. GCS is
> +  opt-in and can be controlled at runtime via the glibc.cpu.aarch64_gcs
> +  tunable, By default GCS is disabled. The readiness level of this feature
> +  is beta. It is intended for early testing and enablement.

About the last two sentences ["The readiness"]... is this something we should 
write / usually write? It feels odd to me, and I'd suggest to just omit
it. I mean, the feature is in a "stable" kernel and a "released" glibc, never
mind that it's new - and a quick search didn't provide any similar qualifications
in the NEWS file.

> +
>  Deprecated and removed features, and other changes affecting compatibility:
>  
>  * The big-endian ARC port (arceb-linux-gnu) has been removed.
> 


-- 
Andreas K. Hüttel
dilfridge@gentoo.org
Gentoo Linux developer
(council, toolchain, base-system, perl, libreoffice)
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