1 files changed, 59 insertions, 0 deletions
diff --git a/sysdeps/aarch64/dl-gcs.c b/sysdeps/aarch64/dl-gcs.c
new file mode 100644
index 0000000000..a92deb54b5
--- /dev/null
+++ b/sysdeps/aarch64/dl-gcs.c
@@ -0,0 +1,59 @@
+/* AArch64 GCS functions.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <unistd.h>
+#include <errno.h>
+#include <libintl.h>
+#include <ldsodefs.h>
+
+static void
+fail (struct link_map *l, const char *program)
+{
+  if (program)
+    _dl_fatal_printf ("%s: %s: not GCS compatible\n", program, l->l_name);
+  else
+    _dl_signal_error (0, l->l_name, "dlopen", N_("not GCS compatible"));
+}
+
+static void
+check_gcs (struct link_map *l, const char *program)
+{
+  if (!l->l_mach.gcs)
+    {
+      if (GLRO(dl_aarch64_gcs_policy) == 2 || !program)
+	fail (l, program);
+      if (GLRO(dl_aarch64_gcs_policy) == 1 && program)
+	GL(dl_aarch64_gcs) = 0;
+    }
+}
+
+/* Apply GCS policy for L and its dependencies.  */
+
+void
+_dl_gcs_check (struct link_map *l, const char *program)
+{
+  /* GCS is disabled.  */
+  if (GL(dl_aarch64_gcs) == 0)
+    return;
+  /* GCS marking is ignored.  */
+  if (GLRO(dl_aarch64_gcs_policy) == 0)
+    return;
+
+  check_gcs (l, program);
+  for (unsigned int i = 0; i < l->l_searchlist.r_nlist; i++)
+    check_gcs (l->l_initfini[i], program);
+}