elf/tst-dlopenfail.c

   1 /* Test dlopen rollback after failures involving NODELETE objects (bug 20839).
   2    Copyright (C) 2019-2022 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>