Resize DTV if the current DTV isn't big enough

This patch changes _dl_allocate_tls_init to resize DTV if the current DTV
isn't big enough.  Tested on X86-64, x32 and ia32.

	[BZ #13862]
	* elf/dl-tls.c: Include <atomic.h>.
	(oom): Remove #ifdef SHARED/#endif.
	(_dl_static_dtv, _dl_initial_dtv): Moved before ...
	(_dl_resize_dtv): This.  Extracted from _dl_update_slotinfo.
	(_dl_allocate_tls_init): Resize DTV if the current DTV isn't
	big enough.
	(_dl_update_slotinfo): Call _dl_resize_dtv to resize DTV.
	* nptl/Makefile (tests): Add tst-stack4.
	(modules-names): Add tst-stack4mod.
	($(objpfx)tst-stack4): New.
	(tst-stack4mod.sos): Likewise.
	($(objpfx)tst-stack4.out): Likewise.
	($(tst-stack4mod.sos)): Likewise.
	(clean): Likewise.
	* nptl/tst-stack4.c: New file.
	* nptl/tst-stack4mod.c: Likewise.

1 files changed, 159 insertions, 0 deletions

diff --git a/nptl/tst-stack4.c b/nptl/tst-stack4.c
new file mode 100644
index 0000000000..d9c8df2c8d
--- /dev/null
+++ b/nptl/tst-stack4.c
@@ -0,0 +1,159 @@
+/* Test DTV size oveflow when pthread_create reuses old DTV and TLS is
+   used by dlopened shared object.
+   Copyright (C) 2014 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 <stdint.h>
+#include <dlfcn.h>
+#include <assert.h>
+#include <pthread.h>
+
+/* The choices of thread count, and file counts are arbitary.
+   The point is simply to run enough threads that an exiting
+   thread has it's stack reused by another thread at the same
+   time as new libraries have been loaded.  */
+#define DSO_SHARED_FILES 20
+#define DSO_OPEN_THREADS 20
+#define DSO_EXEC_THREADS 2
+
+/* Used to make sure that only one thread is calling dlopen and dlclose
+   at a time.  */
+pthread_mutex_t g_lock;
+
+typedef void (*function) (void);
+
+void *
+dso_invoke(void *dso_fun)
+{
+  function *fun_vec = (function *) dso_fun;
+  int dso;
+
+  for (dso = 0; dso < DSO_SHARED_FILES; dso++)
+    (*fun_vec[dso]) ();
+
+  pthread_exit (NULL);
+}
+
+void *
+dso_process (void * p)
+{
+  void *handle[DSO_SHARED_FILES];
+  function fun_vec[DSO_SHARED_FILES];
+  char dso_path[DSO_SHARED_FILES][100];
+  int dso;
+  uintptr_t t = (uintptr_t) p;
+
+  /* Open DSOs and get a function.  */
+  for (dso = 0; dso < DSO_SHARED_FILES; dso++)
+    {
+      sprintf (dso_path[dso], "tst-stack4mod-%i-%i.so", t, dso);
+
+      pthread_mutex_lock (&g_lock);
+
+      handle[dso] = dlopen (dso_path[dso], RTLD_NOW);
+      assert (handle[dso]);
+
+      fun_vec[dso] = (function) dlsym (handle[dso], "function");
+      assert (fun_vec[dso]);
+
+      pthread_mutex_unlock (&g_lock);
+    }
+
+  /* Spawn workers.  */
+  pthread_t thread[DSO_EXEC_THREADS];
+  int i, ret;
+  uintptr_t result = 0;
+  for (i = 0; i < DSO_EXEC_THREADS; i++)
+    {
+      pthread_mutex_lock (&g_lock);
+      ret = pthread_create (&thread[i], NULL, dso_invoke, (void *) fun_vec);
+      if (ret != 0)
+	{
+	  printf ("pthread_create failed: %d\n", ret);
+	  result = 1;
+	}
+      pthread_mutex_unlock (&g_lock);
+    }
+
+  if (!result)
+    for (i = 0; i < DSO_EXEC_THREADS; i++)
+      {
+	ret = pthread_join (thread[i], NULL);
+	if (ret != 0)
+	  {
+	    printf ("pthread_join failed: %d\n", ret);
+	    result = 1;
+	  }
+      }
+
+  /* Close all DSOs.  */
+  for (dso = 0; dso < DSO_SHARED_FILES; dso++)
+    {
+      pthread_mutex_lock (&g_lock);
+      dlclose (handle[dso]);
+      pthread_mutex_unlock (&g_lock);
+    }
+
+  /* Exit.  */
+  pthread_exit ((void *) result);
+}
+
+static int
+do_test (void)
+{
+  pthread_t thread[DSO_OPEN_THREADS];
+  int i,j;
+  int ret;
+  int result = 0;
+
+  pthread_mutex_init (&g_lock, NULL);
+
+  /* 100 is arbitrary here and is known to trigger PR 13862.  */
+  for (j = 0; j < 100; j++)
+    {
+      for (i = 0; i < DSO_OPEN_THREADS; i++)
+	{
+	  ret = pthread_create (&thread[i], NULL, dso_process,
+				(void *) (uintptr_t) i);
+	  if (ret != 0)
+	    {
+	      printf ("pthread_create failed: %d\n", ret);
+	      result = 1;
+	    }
+	}
+
+      if (result)
+	break;
+
+      for (i = 0; i < DSO_OPEN_THREADS; i++)
+	{
+	  ret = pthread_join (thread[i], NULL);
+	  if (ret != 0)
+	    {
+	      printf ("pthread_join failed: %d\n", ret);
+	      result = 1;
+	    }
+	}
+    }
+
+  return result;
+}
+
+#define TEST_FUNCTION do_test ()
+#define TIMEOUT 100
+#include "../test-skeleton.c"