Prepare for radical source tree reorganization. zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 85 insertions, 0 deletions

diff --git a/REORG.TODO/debug/tst-longjmp_chk3.c b/REORG.TODO/debug/tst-longjmp_chk3.c
new file mode 100644
index 0000000000..12b367b970
--- /dev/null
+++ b/REORG.TODO/debug/tst-longjmp_chk3.c
@@ -0,0 +1,85 @@
+/* Make sure longjmp fortification catches bad signal stacks.
+   Copyright (C) 2013-2017 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 <setjmp.h>
+#include <signal.h>
+#include <string.h>
+
+static int do_test (void);
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"
+
+static char buf[SIGSTKSZ * 4];
+static jmp_buf jb;
+
+static void
+handler (int sig)
+{
+  if (sig == SIGUSR1)
+    {
+      if (setjmp (jb) != 0)
+	{
+	  puts ("setjmp should not have been called");
+	  kill (getpid (), SIGTERM);
+	}
+    }
+  else if (sig == SIGABRT)
+    {
+      /* Yeah it worked.  */
+      _exit (0);
+    }
+}
+
+static int
+do_test (void)
+{
+  stack_t ss;
+
+  set_fortify_handler (handler);
+
+  /* Create a valid signal stack and enable it.  */
+  ss.ss_sp = buf;
+  ss.ss_size = sizeof (buf);
+  ss.ss_flags = 0;
+  if (sigaltstack (&ss, NULL) < 0)
+    {
+      printf ("first sigaltstack failed: %m\n");
+      return 1;
+    }
+
+  /* Trigger the signal handler which will create a jmpbuf that points to the
+     end of the signal stack.  */
+  signal (SIGUSR1, handler);
+  kill (getpid (), SIGUSR1);
+
+  /* Shrink the signal stack so the jmpbuf is now invalid.
+     We adjust the start & end to handle stacks that grow up & down.  */
+  ss.ss_sp = buf + sizeof (buf) / 2;
+  ss.ss_size = sizeof (buf) / 4;
+  if (sigaltstack (&ss, NULL) < 0)
+    {
+      printf ("second sigaltstack failed: %m\n");
+      return 1;
+    }
+
+  /* This should fail.  */
+  longjmp (jb, 1);
+
+  puts ("longjmp returned and shouldn't");
+  return 1;
+}