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

[Yury Khrustalev]

On Tue, Jan 21, 2025 at 12:11:32PM +0100, Andreas K. Huettel wrote:
> In general this is of course ok for the release. See remark below.
> 
> Am Dienstag, 21. Januar 2025, 11:57:53 Mitteleurop�ische 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.

Thank you for the feedback. Thinking about it, I agree that it's better to omit it.

Kind regards,
Yury