1 files changed, 39 insertions, 0 deletions
diff --git a/elf/dl-execstack-tunable.c b/elf/dl-execstack-tunable.c
new file mode 100644
index 0000000..6cef1a3
--- /dev/null
+++ b/elf/dl-execstack-tunable.c
@@ -0,0 +1,39 @@
+/* Stack executability handling for GNU dynamic linker.
+   Copyright (C) 2025 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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 <ldsodefs.h>
+#include <dl-tunables.h>
+
+void
+_dl_handle_execstack_tunable (void)
+{
+  switch (TUNABLE_GET (glibc, rtld, execstack, int32_t, NULL))
+    {
+    case stack_tunable_mode_disable:
+      if ((__glibc_unlikely (GL(dl_stack_flags)) & PF_X))
+	_dl_fatal_printf (
+"Fatal glibc error: executable stack is not allowed\n");
+      break;
+
+    case stack_tunable_mode_force:
+      if (_dl_make_stack_executable (&__libc_stack_end) != 0)
+	_dl_fatal_printf (
+"Fatal glibc error: cannot enable executable stack as tunable requires");
+      break;
+    }
+}