File fe9751f2.patch of Package leancrypto
From fe9751f2b13581e938f25b82f3e725372223af81 Mon Sep 17 00:00:00 2001
From: Stephan Mueller <smueller@chronox.de>
Date: Wed, 5 Nov 2025 10:01:06 +0100
Subject: [PATCH] ARM64: Add GCS support in assembly code
The GCS support is properly enabled as seen with the following command:
$ readelf -n build/libleancrypto.so
Displaying notes found in: .note.gnu.property
Owner Data size Description
GNU 0x00000010 NT_GNU_PROPERTY_TYPE_0
Properties: AArch64 feature: BTI, PAC, GCS
Signed-off-by: Stephan Mueller <smueller@chronox.de>
[EDIT: drop the diff of CHANGES.md]
---
CHANGES.md | 2 ++
internal/api/assembler_support.h | 14 ++++++++++++--
2 files changed, 14 insertions(+), 2 deletions(-)
diff --git a/internal/api/assembler_support.h b/internal/api/assembler_support.h
index be6afb00..bc89efb2 100644
--- a/internal/api/assembler_support.h
+++ b/internal/api/assembler_support.h
@@ -73,11 +73,21 @@
# define GNU_PROPERTY_AARCH64_POINTER_AUTH 0
# endif
+# if defined(__ARM_FEATURE_GCS_DEFAULT) && __ARM_FEATURE_GCS_DEFAULT == 1
+# define GNU_PROPERTY_AARCH64_GCS (1<<2)
+# else
+# define GNU_PROPERTY_AARCH64_GCS 0 /* No GCS */
+# endif
+
/* Add the BTI / PAC support to GNU Notes section */
-# if GNU_PROPERTY_AARCH64_BTI != 0 || GNU_PROPERTY_AARCH64_POINTER_AUTH != 0
+# if GNU_PROPERTY_AARCH64_BTI != 0 || \
+ GNU_PROPERTY_AARCH64_POINTER_AUTH != 0 || \
+ GNU_PROPERTY_AARCH64_GCS != 0
# define LC_GNU_PROPERTY_ALIGN 3 /* 2 on 32 bit systems, which we do not cover here */
# define LC_GNU_PROPERTY_TYPE 0xc0000000
-# define LC_GNU_PROPERTY_DATA (GNU_PROPERTY_AARCH64_BTI|GNU_PROPERTY_AARCH64_POINTER_AUTH)
+# define LC_GNU_PROPERTY_DATA (GNU_PROPERTY_AARCH64_BTI | \
+ GNU_PROPERTY_AARCH64_POINTER_AUTH | \
+ GNU_PROPERTY_AARCH64_GCS)
# endif
#endif
