elf/tst-dlopenfail.c

   1 /* Test dlopen rollback after failures involving NODELETE objects (bug 20839).
   2    Copyright (C) 2019-2021 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 <gnu/lib-names.h>
  22 #include <stddef.h>
  23 #include <stdio.h>
  24 #include <string.h>
  25 #include <support/check.h>
  26 #include <support/xdlfcn.h>
  27
  28 static int
  29 do_test (void)
  30 {
  31   /* This test uses libpthread as the canonical NODELETE module.  If
  32      libpthread is no longer NODELETE because it has been merged into
  33      libc, the test needs to be updated.  */
  34   TEST_VERIFY (dlsym (NULL, "pthread_create") == NULL);
  35
  36   /* This is expected to fail because of the missing dependency.  */
  37   puts ("info: attempting to load tst-dlopenfailmod1.so");
  38   TEST_VERIFY (dlopen ("tst-dlopenfailmod1.so", RTLD_LAZY) == NULL);
  39   const char *message = dlerror ();
  40   TEST_COMPARE_STRING (message,
  41                        "tst-dlopenfail-missingmod.so:"
  42                        " cannot open shared object file:"
  43                        " No such file or directory");
  44
  45   /* Do not probe for the presence of libpthread at this point because
  46      that might trigger relocation if bug 20839 is present, obscuring
  47      a subsequent crash.  */
  48
  49   /* This is expected to succeed.  */
  50   puts ("info: loading tst-dlopenfailmod2.so");
  51   void *handle = xdlopen ("tst-dlopenfailmod2.so", RTLD_NOW);
  52   xdlclose (handle);
  53
  54   /* libpthread should remain loaded.  */
  55   TEST_VERIFY (dlopen (LIBPTHREAD_SO, RTLD_LAZY | RTLD_NOLOAD) != NULL);
  56   TEST_VERIFY (dlsym (NULL, "pthread_create") == NULL);
  57
  58   /* We can make libpthread global, and then the symbol should become
  59      available.  */
  60   TEST_VERIFY (dlopen (LIBPTHREAD_SO, RTLD_LAZY | RTLD_GLOBAL) != NULL);
  61   TEST_VERIFY (dlsym (NULL, "pthread_create") != NULL);
  62
  63   /* sem_open is sufficiently complex to depend on relocations.  */
  64   void *(*sem_open_ptr) (const char *, int flag, ...)
  65     = dlsym (NULL, "sem_open");
  66   if (sem_open_ptr == NULL)
  67     /* Hurd does not implement sem_open.  */
  68     puts ("warning: sem_open not found, further testing not possible");
  69   else
  70     {
  71       errno = 0;
  72       TEST_VERIFY (sem_open_ptr ("/", 0) == NULL);
  73       TEST_COMPARE (errno, EINVAL);
  74     }
  75
  76   return 0;
  77 }
  78
  79 #include <support/test-driver.c>