1  /* Test for user-after-free bug in pthread_getattr_default_np (bug 25999).
       2     Copyright (C) 2020-2023 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 <pthread.h>
      20  #include <sched.h>
      21  #include <support/check.h>
      22  #include <support/xthread.h>
      23  
      24  static int
      25  do_test (void)
      26  {
      27    /* This is a typical affinity size.  */
      28    enum { cpu_count = 128 };
      29    cpu_set_t *set = CPU_ALLOC (cpu_count);
      30    size_t set_size = CPU_ALLOC_SIZE (cpu_count);
      31    CPU_ZERO_S (set_size, set);
      32    CPU_SET (1, set);
      33    CPU_SET (3, set);
      34  
      35    /* Apply the affinity mask to the default attribute.  */
      36    pthread_attr_t attr;
      37    xpthread_attr_init (&attr);
      38    TEST_COMPARE (pthread_attr_setaffinity_np (&attr, set_size, set), 0);
      39    TEST_COMPARE (pthread_setattr_default_np (&attr), 0);
      40    xpthread_attr_destroy (&attr);
      41  
      42    /* Read back the default attribute and check affinity mask.  */
      43    pthread_getattr_default_np (&attr);
      44    CPU_ZERO_S (set_size, set);
      45    TEST_COMPARE (pthread_attr_getaffinity_np (&attr, set_size, set), 0);
      46    for (int i = 0; i < cpu_count; ++i)
      47      TEST_COMPARE (!!CPU_ISSET (i, set), i == 1 || i == 3);
      48  
      49  
      50    /* Apply a larger CPU affinity mask to the default attribute, to
      51       trigger reallocation.  */
      52    {
      53      cpu_set_t *large_set = CPU_ALLOC (4 * cpu_count);
      54      size_t large_set_size = CPU_ALLOC_SIZE (4 * cpu_count);
      55      CPU_ZERO_S (large_set_size, large_set);
      56      pthread_attr_t large_attr;
      57      xpthread_attr_init (&large_attr);
      58      TEST_COMPARE (pthread_attr_setaffinity_np (&large_attr,
      59                                                 large_set_size, large_set), 0);
      60      TEST_COMPARE (pthread_setattr_default_np (&large_attr), 0);
      61      xpthread_attr_destroy (&large_attr);
      62      CPU_FREE (large_set);
      63    }
      64  
      65    /* Read back the default attribute and check affinity mask.  */
      66    CPU_ZERO_S (set_size, set);
      67    TEST_COMPARE (pthread_attr_getaffinity_np (&attr, set_size, set), 0);
      68    for (int i = 0; i < cpu_count; ++i)
      69      TEST_COMPARE (!!CPU_ISSET (i, set), i == 1 || i == 3);
      70    /* Due to bug 25999, the following caused a double-free abort.  */
      71    xpthread_attr_destroy (&attr);
      72  
      73    CPU_FREE (set);
      74  
      75    return 0;
      76  }
      77  
      78  #include <support/test-driver.c>