elf/tst-dlopen-tlsmodid.h

   1 /* Common code for tst-dlopen-tlsmodid, tst-dlopen-tlsmodid-pie,
   2    tst-dlopen-tlsmodid-container.
   3
   4    Verify that incorrectly dlopen()ing an executable without
   5    __RTLD_OPENEXEC does not cause assertion in ld.so, and that it
   6    actually results in an error.
   7
   8    Copyright (C) 2014-2020 Free Software Foundation, Inc.
   9    This file is part of the GNU C Library.
  10
  11    The GNU C Library is free software; you can redistribute it and/or
  12    modify it under the terms of the GNU Lesser General Public
  13    License as published by the Free Software Foundation; either
  14    version 2.1 of the License, or (at your option) any later version.
  15
  16    The GNU C Library is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19    Lesser General Public License for more details.
  20
  21    You should have received a copy of the GNU Lesser General Public
  22    License along with the GNU C Library; if not, see
  23    <https://www.gnu.org/licenses/>.  */
  24
  25 /* Before including this file, the macro TST_DLOPEN_TLSMODID_PATH must
  26    be defined, to specify the path used for the open operation.  */
  27
  28 #include <dlfcn.h>
  29 #include <pthread.h>
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <support/check.h>
  34 #include <support/support.h>
  35 #include <support/xthread.h>
  36
  37 __thread int x;
  38
  39 void *
  40 fn (void *p)
  41 {
  42   return p;
  43 }
  44
  45 /* Call dlopen and check that fails with an error message indicating
  46    an attempt to open an ET_EXEC or PIE object.  */
  47 static void
  48 check_dlopen_failure (void)
  49 {
  50   void *handle = dlopen (TST_DLOPEN_TLSMODID_PATH, RTLD_LAZY);
  51   if (handle != NULL)
  52     FAIL_EXIT1 ("dlopen succeeded unexpectedly: %s", TST_DLOPEN_TLSMODID_PATH);
  53
  54   const char *message = dlerror ();
  55   TEST_VERIFY_EXIT (message != NULL);
  56   if ((strstr (message,
  57                "cannot dynamically load position-independent executable")
  58        == NULL)
  59       && strstr (message, "cannot dynamically load executable") == NULL)
  60     FAIL_EXIT1 ("invalid dlopen error message: \"%s\"", message);
  61 }
  62
  63 static int
  64 do_test (int argc, char *argv[])
  65 {
  66   int j;
  67
  68   for (j = 0; j < 100; ++j)
  69     {
  70       pthread_t thr;
  71
  72       check_dlopen_failure ();
  73
  74       /* We create threads to force TLS allocation, which triggers
  75          the original bug i.e. running out of surplus slotinfo entries
  76          for TLS.  */
  77       thr = xpthread_create (NULL, fn, NULL);
  78       xpthread_join (thr);
  79     }
  80
  81   check_dlopen_failure ();
  82
  83   return 0;
  84 }
  85
  86 #define TEST_FUNCTION_ARGV do_test
  87 #include <support/test-driver.c>