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NEWS: Add note on Guarded Control Stack support

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Reviewed-by: Andreas K. Huettel <dilfridge@gentoo.org>
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Yury Khrustalev 2025-01-21 13:44:05 +00:00 committed by Andreas K. Hüttel
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NEWS
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@ -74,6 +74,16 @@ 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. Linux kernel supports this since 6.13.
Deprecated and removed features, and other changes affecting compatibility:
* The big-endian ARC port (arceb-linux-gnu) has been removed.