nptl/tst-pthread-defaultattr-free.c

   1 /* Test for user-after-free bug in pthread_getattr_default_np (bug 25999).
   2    Copyright (C) 2020-2022 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 <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>