x86/cet: Check legacy shadow stack code in .init_array section

Verify that legacy shadow stack code in .init_array section in application
and shared library, which are marked as shadow stack enabled, will trigger
segfault.

1 files changed, 28 insertions, 0 deletions

diff --git a/sysdeps/x86/tst-shstk-legacy-mod-1.c b/sysdeps/x86/tst-shstk-legacy-mod-1.c
new file mode 100644
index 0000000000..b75b5484d9
--- /dev/null
+++ b/sysdeps/x86/tst-shstk-legacy-mod-1.c
@@ -0,0 +1,28 @@
+/* Check legacy shadow stack code in init_array.
+   Copyright (C) 2023 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 <stdlib.h>
+
+/* Check legacy shadow stack code in init_array.  */
+extern void legacy (void) __attribute__ ((visibility ("hidden")));
+
+void (*init_array []) (void)
+     __attribute__ ((section (".init_array"), aligned (sizeof (void *)))) =
+{
+  &legacy
+};