x86/CET: Add a re-exec test with legacy bitmap

Add a re-exec test with legacy bitmap to verify that legacy bitmap is
properly hanlded by kernel.

	* sysdeps/x86/Makefile (tests): Add tst-cet-legacy-1a.
	(tst-cet-legacy-1a-ARGS): New.
	($(objpfx)tst-cet-legacy-1a): New target.
	* sysdeps/x86/tst-cet-legacy-1a.c: New file.

2 files changed, 86 insertions, 2 deletions

diff --git a/sysdeps/x86/Makefile b/sysdeps/x86/Makefile
index f2fd031ac7..7ec46ca100 100644
--- a/sysdeps/x86/Makefile
+++ b/sysdeps/x86/Makefile
@@ -18,8 +18,9 @@ ifeq ($(enable-cet),yes)
 ifeq ($(subdir),elf)
 sysdep-dl-routines += dl-cet
 
-tests += tst-cet-legacy-1 tst-cet-legacy-2 tst-cet-legacy-2a \
-	 tst-cet-legacy-3 tst-cet-legacy-4
+tests += tst-cet-legacy-1 tst-cet-legacy-1a tst-cet-legacy-2 \
+	 tst-cet-legacy-2a tst-cet-legacy-3 tst-cet-legacy-4
+tst-cet-legacy-1a-ARGS = -- $(host-test-program-cmd)
 ifneq (no,$(have-tunables))
 tests += tst-cet-legacy-4a tst-cet-legacy-4b tst-cet-legacy-4c
 endif
@@ -38,6 +39,8 @@ CFLAGS-tst-cet-legacy-mod-4.c += -fcf-protection=none
 
 $(objpfx)tst-cet-legacy-1: $(objpfx)tst-cet-legacy-mod-1.so \
 		       $(objpfx)tst-cet-legacy-mod-2.so
+$(objpfx)tst-cet-legacy-1a: $(objpfx)tst-cet-legacy-mod-1.so \
+		       $(objpfx)tst-cet-legacy-mod-2.so
 $(objpfx)tst-cet-legacy-2: $(objpfx)tst-cet-legacy-mod-2.so $(libdl)
 $(objpfx)tst-cet-legacy-2.out: $(objpfx)tst-cet-legacy-mod-1.so
 $(objpfx)tst-cet-legacy-2a: $(objpfx)tst-cet-legacy-mod-2.so $(libdl)
diff --git a/sysdeps/x86/tst-cet-legacy-1a.c b/sysdeps/x86/tst-cet-legacy-1a.c
new file mode 100644
index 0000000000..8fde2968e8
--- /dev/null
+++ b/sysdeps/x86/tst-cet-legacy-1a.c
@@ -0,0 +1,81 @@
+/* Test for re-exec with legacy bitmap.
+   Copyright (C) 2018 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
+   <http://www.gnu.org/licenses/>.  */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <support/check.h>
+
+/* Nonzero if the program gets called via `exec'.  */
+static int restart;
+
+#define CMDLINE_OPTIONS \
+  { "restart", no_argument, &restart, 1 },
+
+extern int do_test (int argc, char *argv[]);
+
+extern int in_dso_1 (void);
+extern int in_dso_2 (void);
+
+static int
+check (void)
+{
+  if (in_dso_1 () != 0x1234678)
+    {
+      puts ("in_dso_1 () != 0x1234678");
+      exit (1);
+    }
+
+  if (in_dso_2 () != 0xbadbeef)
+    {
+      puts ("in_dso_2 () != 0xbadbeef");
+      exit (1);
+    }
+
+  return 0;
+}
+
+int
+do_test (int argc, char *argv[])
+{
+  /* We must have
+     - one or four parameters left if called initially
+       + path for ld.so		optional
+       + "--library-path"	optional
+       + the library path	optional
+       + the application name
+  */
+
+  if (restart)
+    return check ();
+
+  if (argc != 2 && argc != 5)
+    FAIL_EXIT1 ("wrong number of arguments (%d)", argc);
+
+  if (argc == 5)
+    execl (argv[1], argv[1], argv[2], argv[3], argv[4], "--direct",
+	   "--restart",  NULL);
+  else
+    execl (argv[1], argv[1], "--direct", "--restart",  NULL);
+
+  return -1;
+}
+
+#define TEST_FUNCTION_ARGV do_test
+#include <support/test-driver.c>