nptl/tst-stack4.c

   1 /* Test DTV size oveflow when pthread_create reuses old DTV and TLS is
   2    used by dlopened shared object.
   3    Copyright (C) 2014-2017 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <stdio.h>
  21 #include <stdint.h>
  22 #include <dlfcn.h>
  23 #include <assert.h>
  24 #include <pthread.h>
  25
  26 /* The choices of thread count, and file counts are arbitary.
  27    The point is simply to run enough threads that an exiting
  28    thread has it's stack reused by another thread at the same
  29    time as new libraries have been loaded.  */
  30 #define DSO_SHARED_FILES 20
  31 #define DSO_OPEN_THREADS 20
  32 #define DSO_EXEC_THREADS 2
  33
  34 /* Used to make sure that only one thread is calling dlopen and dlclose
  35    at a time.  */
  36 pthread_mutex_t g_lock;
  37
  38 typedef void (*function) (void);
  39
  40 void *
  41 dso_invoke(void *dso_fun)
  42 {
  43   function *fun_vec = (function *) dso_fun;
  44   int dso;
  45
  46   for (dso = 0; dso < DSO_SHARED_FILES; dso++)
  47     (*fun_vec[dso]) ();
  48
  49   pthread_exit (NULL);
  50 }
  51
  52 void *
  53 dso_process (void * p)
  54 {
  55   void *handle[DSO_SHARED_FILES];
  56   function fun_vec[DSO_SHARED_FILES];
  57   char dso_path[DSO_SHARED_FILES][100];
  58   int dso;
  59   int t = (int) (uintptr_t) p;
  60
  61   /* Open DSOs and get a function.  */
  62   for (dso = 0; dso < DSO_SHARED_FILES; dso++)
  63     {
  64       sprintf (dso_path[dso], "tst-stack4mod-%i-%i.so", t, dso);
  65
  66       pthread_mutex_lock (&g_lock);
  67
  68       handle[dso] = dlopen (dso_path[dso], RTLD_NOW);
  69       assert (handle[dso]);
  70
  71       fun_vec[dso] = (function) dlsym (handle[dso], "function");
  72       assert (fun_vec[dso]);
  73
  74       pthread_mutex_unlock (&g_lock);
  75     }
  76
  77   /* Spawn workers.  */
  78   pthread_t thread[DSO_EXEC_THREADS];
  79   int i, ret;
  80   uintptr_t result = 0;
  81   for (i = 0; i < DSO_EXEC_THREADS; i++)
  82     {
  83       pthread_mutex_lock (&g_lock);
  84       ret = pthread_create (&thread[i], NULL, dso_invoke, (void *) fun_vec);
  85       if (ret != 0)
  86         {
  87           printf ("pthread_create failed: %d\n", ret);
  88           result = 1;
  89         }
  90       pthread_mutex_unlock (&g_lock);
  91     }
  92
  93   if (!result)
  94     for (i = 0; i < DSO_EXEC_THREADS; i++)
  95       {
  96         ret = pthread_join (thread[i], NULL);
  97         if (ret != 0)
  98           {
  99             printf ("pthread_join failed: %d\n", ret);
 100             result = 1;
 101           }
 102       }
 103
 104   /* Close all DSOs.  */
 105   for (dso = 0; dso < DSO_SHARED_FILES; dso++)
 106     {
 107       pthread_mutex_lock (&g_lock);
 108       dlclose (handle[dso]);
 109       pthread_mutex_unlock (&g_lock);
 110     }
 111
 112   /* Exit.  */
 113   pthread_exit ((void *) result);
 114 }
 115
 116 static int
 117 do_test (void)
 118 {
 119   pthread_t thread[DSO_OPEN_THREADS];
 120   int i,j;
 121   int ret;
 122   int result = 0;
 123
 124   pthread_mutex_init (&g_lock, NULL);
 125
 126   /* 100 is arbitrary here and is known to trigger PR 13862.  */
 127   for (j = 0; j < 100; j++)
 128     {
 129       for (i = 0; i < DSO_OPEN_THREADS; i++)
 130         {
 131           ret = pthread_create (&thread[i], NULL, dso_process,
 132                                 (void *) (uintptr_t) i);
 133           if (ret != 0)
 134             {
 135               printf ("pthread_create failed: %d\n", ret);
 136               result = 1;
 137             }
 138         }
 139
 140       if (result)
 141         break;
 142
 143       for (i = 0; i < DSO_OPEN_THREADS; i++)
 144         {
 145           ret = pthread_join (thread[i], NULL);
 146           if (ret != 0)
 147             {
 148               printf ("pthread_join failed: %d\n", ret);
 149               result = 1;
 150             }
 151         }
 152     }
 153
 154   return result;
 155 }
 156
 157 #define TEST_FUNCTION do_test ()
 158 #define TIMEOUT 100
 159 #include "../test-skeleton.c"