1  /* Test dlopen rollback after failures involving NODELETE objects (bug 20839).
       2     Copyright (C) 2019-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <dlfcn.h>
      20  #include <errno.h>
      21  #include <stddef.h>
      22  #include <stdio.h>
      23  #include <string.h>
      24  #include <support/check.h>
      25  #include <support/xdlfcn.h>
      26  
      27  static int
      28  do_test (void)
      29  {
      30    TEST_VERIFY (dlsym (NULL, "no_delete_mod_function") == NULL);
      31  
      32    /* This is expected to fail because of the missing dependency.  */
      33    puts ("info: attempting to load tst-dlopenfailmod1.so");
      34    TEST_VERIFY (dlopen ("tst-dlopenfailmod1.so", RTLD_LAZY) == NULL);
      35    const char *message = dlerror ();
      36    TEST_COMPARE_STRING (message,
      37                         "tst-dlopenfail-missingmod.so:"
      38                         " cannot open shared object file:"
      39                         " No such file or directory");
      40  
      41    /* Do not probe for the presence of the tst-dlopenfailnodelmod.so at
      42       this point because that might trigger relocation if bug 20839 is
      43       present, obscuring a subsequent crash.  */
      44  
      45    /* This is expected to succeed.  */
      46    puts ("info: loading tst-dlopenfailmod2.so");
      47    void *handle = xdlopen ("tst-dlopenfailmod2.so", RTLD_NOW);
      48    xdlclose (handle);
      49  
      50    /* The NODELETE module should remain loaded.  */
      51    TEST_VERIFY (dlopen ("tst-dlopenfailnodelmod.so", RTLD_LAZY | RTLD_NOLOAD)
      52                 != NULL);
      53    /* But the symbol is not in the global scope.  */
      54    TEST_VERIFY (dlsym (NULL, "no_delete_mod_function") == NULL);
      55  
      56    /* We can make tst-dlopenfailnodelmod.so global, and then the symbol
      57       should become available.  */
      58    TEST_VERIFY (dlopen ("tst-dlopenfailnodelmod.so", RTLD_LAZY | RTLD_GLOBAL)
      59                 != NULL);
      60    void (*no_delete_mod_function) (void)
      61      = dlsym (NULL, "no_delete_mod_function");
      62    TEST_VERIFY_EXIT (no_delete_mod_function != NULL);
      63  
      64    /* Hopefully, no_delete_mod_function is sufficiently complex to
      65       depend on relocations.  */
      66    no_delete_mod_function ();
      67  
      68    return 0;
      69  }
      70  
      71  #include <support/test-driver.c>