x86/cet: Check legacy shadow stack applications

Add tests to verify that legacy shadow stack applications run properly
when shadow stack is enabled in Linux kernel.

1 files changed, 38 insertions, 0 deletions

diff --git a/sysdeps/x86/tst-shstk-legacy-1b.c b/sysdeps/x86/tst-shstk-legacy-1b.c
new file mode 100644
index 0000000..05231e6
--- /dev/null
+++ b/sysdeps/x86/tst-shstk-legacy-1b.c
@@ -0,0 +1,38 @@
+/* Check that legacy shadow stack code will trigger segfault.
+   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>
+#include <sys/platform/x86.h>
+#include <support/test-driver.h>
+#include <support/xsignal.h>
+
+/* Check that legacy shadow stack code will trigger segfault.  */
+extern void legacy (void);
+
+static int
+do_test (void)
+{
+  if (!CPU_FEATURE_ACTIVE (SHSTK))
+    return EXIT_UNSUPPORTED;
+
+  legacy ();
+  return EXIT_FAILURE;
+}
+
+#define EXPECTED_SIGNAL (CPU_FEATURE_ACTIVE (SHSTK) ? SIGSEGV : 0)
+#include <support/test-driver.c>