x86/CET: Add tests with legacy non-CET shared objects

Check binary compatibility of CET-enabled executables:

1. When CET-enabled executable is used with legacy non-CET shared object
at run-time, ld.so should disable SHSTK and put legacy non-CET shared
objects in legacy bitmap.
2. When IBT-enabled executable dlopens legacy non-CET shared object,
ld.so should put legacy shared object in legacy bitmap.
3. Use GLIBC_TUNABLES=glibc.tune.x86_shstk=[on|off|permissive] to
control how SHSTK is enabled.

	* sysdeps/x86/Makefile (tests): Add tst-cet-legacy-1,
	tst-cet-legacy-2, tst-cet-legacy-2a, tst-cet-legacy-3,
	tst-cet-legacy-4, tst-cet-legacy-4a, tst-cet-legacy-4b
	and tst-cet-legacy-4c.
	(modules-names): Add tst-cet-legacy-mod-1, tst-cet-legacy-mod-2
	and tst-cet-legacy-mod-4.
	(CFLAGS-tst-cet-legacy-2.c): New.
	(CFLAGS-tst-cet-legacy-mod-1.c): Likewise.
	(CFLAGS-tst-cet-legacy-mod-2.c): Likewise.
	(CFLAGS-tst-cet-legacy-3.c): Likewise.
	(CFLAGS-tst-cet-legacy-4.c): Likewise.
	(CFLAGS-tst-cet-legacy-mod-4.c): Likewise.
	($(objpfx)tst-cet-legacy-1): Likewise.
	($(objpfx)tst-cet-legacy-2): Likewise.
	($(objpfx)tst-cet-legacy-2.out): Likewise.
	($(objpfx)tst-cet-legacy-2a): Likewise.
	($(objpfx)tst-cet-legacy-2a.out): Likewise.
	($(objpfx)tst-cet-legacy-4): Likewise.
	($(objpfx)tst-cet-legacy-4.out): Likewise.
	($(objpfx)tst-cet-legacy-4a): Likewise.
	($(objpfx)tst-cet-legacy-4a.out): Likewise.
	(tst-cet-legacy-4a-ENV): Likewise.
	($(objpfx)tst-cet-legacy-4b): Likewise.
	($(objpfx)tst-cet-legacy-4b.out): Likewise.
	(tst-cet-legacy-4b-ENV): Likewise.
	($(objpfx)tst-cet-legacy-4c): Likewise.
	($(objpfx)tst-cet-legacy-4c.out): Likewise.
	(tst-cet-legacy-4c-ENV): Likewise.
	* sysdeps/x86/tst-cet-legacy-1.c: New file.
	* sysdeps/x86/tst-cet-legacy-2.c: Likewise.
	* sysdeps/x86/tst-cet-legacy-2a.c: Likewise.
	* sysdeps/x86/tst-cet-legacy-3.c: Likewise.
	* sysdeps/x86/tst-cet-legacy-4.c: Likewise.
	* sysdeps/x86/tst-cet-legacy-4a.c: Likewise.
	* sysdeps/x86/tst-cet-legacy-4b.c: Likewise.
	* sysdeps/x86/tst-cet-legacy-4c.c: Likewise.
	* sysdeps/x86/tst-cet-legacy-mod-1.c: Likewise.
	* sysdeps/x86/tst-cet-legacy-mod-2.c: Likewise.
	* sysdeps/x86/tst-cet-legacy-mod-4.c: Likewise.

12 files changed, 293 insertions, 0 deletions

diff --git a/sysdeps/x86/Makefile b/sysdeps/x86/Makefile
index e9b2d0b35d..672bb19489 100644
--- a/sysdeps/x86/Makefile
+++ b/sysdeps/x86/Makefile
@@ -17,6 +17,44 @@ endif
 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
+ifneq (no,$(have-tunables))
+tests += tst-cet-legacy-4a tst-cet-legacy-4b tst-cet-legacy-4c
+endif
+modules-names += tst-cet-legacy-mod-1 tst-cet-legacy-mod-2 \
+		 tst-cet-legacy-mod-4
+
+CFLAGS-tst-cet-legacy-2.c += -fcf-protection=branch
+CFLAGS-tst-cet-legacy-2a.c += -fcf-protection
+CFLAGS-tst-cet-legacy-mod-1.c += -fcf-protection=none
+CFLAGS-tst-cet-legacy-mod-2.c += -fcf-protection=none
+CFLAGS-tst-cet-legacy-3.c += -fcf-protection=none
+CFLAGS-tst-cet-legacy-4.c += -fcf-protection=branch
+CFLAGS-tst-cet-legacy-4a.c += -fcf-protection
+CFLAGS-tst-cet-legacy-4b.c += -fcf-protection
+CFLAGS-tst-cet-legacy-mod-4.c += -fcf-protection=none
+
+$(objpfx)tst-cet-legacy-1: $(objpfx)tst-cet-legacy-mod-1.so \
+		       $(objpfx)tst-cet-legacy-mod-2.so
+$(objpfx)tst-cet-legacy-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 $(libdl)
+$(objpfx)tst-cet-legacy-2a.out: $(objpfx)tst-cet-legacy-mod-1.so
+$(objpfx)tst-cet-legacy-4: $(libdl)
+$(objpfx)tst-cet-legacy-4.out: $(objpfx)tst-cet-legacy-mod-4.so
+ifneq (no,$(have-tunables))
+$(objpfx)tst-cet-legacy-4a: $(libdl)
+$(objpfx)tst-cet-legacy-4a.out: $(objpfx)tst-cet-legacy-mod-4.so
+tst-cet-legacy-4a-ENV = GLIBC_TUNABLES=glibc.tune.x86_shstk=permissive
+$(objpfx)tst-cet-legacy-4b: $(libdl)
+$(objpfx)tst-cet-legacy-4b.out: $(objpfx)tst-cet-legacy-mod-4.so
+tst-cet-legacy-4b-ENV = GLIBC_TUNABLES=glibc.tune.x86_shstk=on
+$(objpfx)tst-cet-legacy-4c: $(libdl)
+$(objpfx)tst-cet-legacy-4c.out: $(objpfx)tst-cet-legacy-mod-4.so
+tst-cet-legacy-4c-ENV = GLIBC_TUNABLES=glibc.tune.x86_shstk=off
+endif
 endif
 
 # Add -fcf-protection to CFLAGS when CET is enabled.
diff --git a/sysdeps/x86/tst-cet-legacy-1.c b/sysdeps/x86/tst-cet-legacy-1.c
new file mode 100644
index 0000000000..861c09a26e
--- /dev/null
+++ b/sysdeps/x86/tst-cet-legacy-1.c
@@ -0,0 +1,44 @@
+/* Check compatibility of CET-enabled executable linked with legacy
+   shared object.
+   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 <stdio.h>
+#include <stdlib.h>
+
+extern int in_dso_1 (void);
+extern int in_dso_2 (void);
+
+static int
+do_test (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;
+}
+
+#include <support/test-driver.c>
diff --git a/sysdeps/x86/tst-cet-legacy-2.c b/sysdeps/x86/tst-cet-legacy-2.c
new file mode 100644
index 0000000000..e039a16797
--- /dev/null
+++ b/sysdeps/x86/tst-cet-legacy-2.c
@@ -0,0 +1,64 @@
+/* Check compatibility of CET-enabled executable with dlopened legacy
+   shared object.
+   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 <dlfcn.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+extern int in_dso_2 (void);
+
+static int
+do_test (void)
+{
+  static const char modname[] = "tst-cet-legacy-mod-1.so";
+  int (*fp) (void);
+  void *h;
+
+  h = dlopen (modname, RTLD_LAZY);
+  if (h == NULL)
+    {
+      printf ("cannot open '%s': %s\n", modname, dlerror ());
+      exit (1);
+    }
+
+  fp = dlsym (h, "in_dso_1");
+  if (fp == NULL)
+    {
+      printf ("cannot get symbol 'in_dso': %s\n", dlerror ());
+      exit (1);
+    }
+
+  if (fp () != 0x1234678)
+    {
+      puts ("in_dso_1 () != 0x1234678");
+      exit (1);
+    }
+
+  if (in_dso_2 () != 0xbadbeef)
+    {
+      puts ("in_dso_2 () != 0xbadbeef");
+      exit (1);
+    }
+
+  dlclose (h);
+
+  return 0;
+}
+
+#include <support/test-driver.c>
diff --git a/sysdeps/x86/tst-cet-legacy-2a.c b/sysdeps/x86/tst-cet-legacy-2a.c
new file mode 100644
index 0000000000..d5aead4303
--- /dev/null
+++ b/sysdeps/x86/tst-cet-legacy-2a.c
@@ -0,0 +1 @@
+#include "tst-cet-legacy-2.c"
diff --git a/sysdeps/x86/tst-cet-legacy-3.c b/sysdeps/x86/tst-cet-legacy-3.c
new file mode 100644
index 0000000000..bab9faa8b0
--- /dev/null
+++ b/sysdeps/x86/tst-cet-legacy-3.c
@@ -0,0 +1,37 @@
+/* Check compatibility of CET-enabled executable with dlopened legacy
+   shared object.
+   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 <stdio.h>
+
+int
+test (void)
+{
+  printf ("PASS\n");
+  return 0;
+}
+
+#ifndef TEST_MODULE
+static int
+do_test (void)
+{
+  return test ();
+}
+
+#include <support/test-driver.c>
+#endif
diff --git a/sysdeps/x86/tst-cet-legacy-4.c b/sysdeps/x86/tst-cet-legacy-4.c
new file mode 100644
index 0000000000..3ead63dd24
--- /dev/null
+++ b/sysdeps/x86/tst-cet-legacy-4.c
@@ -0,0 +1,56 @@
+/* Check compatibility of CET-enabled executable with dlopened legacy
+   shared object.
+   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 <dlfcn.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+static int
+do_test (void)
+{
+  static const char modname[] = "tst-cet-legacy-mod-4.so";
+  int (*fp) (void);
+  void *h;
+
+  h = dlopen (modname, RTLD_LAZY);
+  if (h == NULL)
+    {
+      printf ("cannot open '%s': %s\n", modname, dlerror ());
+      exit (1);
+    }
+
+  fp = dlsym (h, "test");
+  if (fp == NULL)
+    {
+      printf ("cannot get symbol 'test': %s\n", dlerror ());
+      exit (1);
+    }
+
+  if (fp () != 0)
+    {
+      puts ("test () != 0");
+      exit (1);
+    }
+
+  dlclose (h);
+
+  return 0;
+}
+
+#include <support/test-driver.c>
diff --git a/sysdeps/x86/tst-cet-legacy-4a.c b/sysdeps/x86/tst-cet-legacy-4a.c
new file mode 100644
index 0000000000..b9bb18c36b
--- /dev/null
+++ b/sysdeps/x86/tst-cet-legacy-4a.c
@@ -0,0 +1 @@
+#include "tst-cet-legacy-4.c"
diff --git a/sysdeps/x86/tst-cet-legacy-4b.c b/sysdeps/x86/tst-cet-legacy-4b.c
new file mode 100644
index 0000000000..b9bb18c36b
--- /dev/null
+++ b/sysdeps/x86/tst-cet-legacy-4b.c
@@ -0,0 +1 @@
+#include "tst-cet-legacy-4.c"
diff --git a/sysdeps/x86/tst-cet-legacy-4c.c b/sysdeps/x86/tst-cet-legacy-4c.c
new file mode 100644
index 0000000000..b9bb18c36b
--- /dev/null
+++ b/sysdeps/x86/tst-cet-legacy-4c.c
@@ -0,0 +1 @@
+#include "tst-cet-legacy-4.c"
diff --git a/sysdeps/x86/tst-cet-legacy-mod-1.c b/sysdeps/x86/tst-cet-legacy-mod-1.c
new file mode 100644
index 0000000000..09762bce13
--- /dev/null
+++ b/sysdeps/x86/tst-cet-legacy-mod-1.c
@@ -0,0 +1,24 @@
+/* Check compatibility of CET-enabled executable with legacy shared
+   object.
+   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/>.  */
+
+int
+in_dso_1 (void)
+{
+  return 0x1234678;
+}
diff --git a/sysdeps/x86/tst-cet-legacy-mod-2.c b/sysdeps/x86/tst-cet-legacy-mod-2.c
new file mode 100644
index 0000000000..1c8de443f6
--- /dev/null
+++ b/sysdeps/x86/tst-cet-legacy-mod-2.c
@@ -0,0 +1,24 @@
+/* Check compatibility of CET-enabled executable with legacy shared
+   object.
+   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/>.  */
+
+int
+in_dso_2 (void)
+{
+  return 0xbadbeef;
+}
diff --git a/sysdeps/x86/tst-cet-legacy-mod-4.c b/sysdeps/x86/tst-cet-legacy-mod-4.c
new file mode 100644
index 0000000000..a93c2fe4a7
--- /dev/null
+++ b/sysdeps/x86/tst-cet-legacy-mod-4.c
@@ -0,0 +1,2 @@
+#define TEST_MODULE
+#include "tst-cet-legacy-3.c"