nptl/tst-setgroups.c

   1 /* Test setgroups as root and in the presence of threads (Bug 26248)
   2    Copyright (C) 2020 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 <stdlib.h>
  20 #include <limits.h>
  21 #include <grp.h>
  22 #include <errno.h>
  23 #include <error.h>
  24 #include <support/xthread.h>
  25 #include <support/support.h>
  26 #include <support/test-driver.h>
  27 #include <support/xunistd.h>
  28
  29 /* The purpose of this test is to test the setgroups API as root and in
  30    the presence of threads.  Once we create a thread the setgroups
  31    implementation must ensure that all threads are set to the same
  32    group and this operation should not fail. Lastly we test setgroups
  33    with a zero sized group and a bad address and verify we get EPERM.  */
  34
  35 static void *
  36 start_routine (void *args)
  37 {
  38   return NULL;
  39 }
  40
  41 static int
  42 do_test (void)
  43 {
  44   int size;
  45   /* NB: Stack address can be at 0xfffXXXXX on 32-bit OSes.  */
  46   gid_t list[NGROUPS_MAX];
  47   int status = EXIT_SUCCESS;
  48
  49   pthread_t thread = xpthread_create (NULL, start_routine, NULL);
  50
  51   size = getgroups (sizeof (list) / sizeof (list[0]), list);
  52   if (size < 0)
  53     {
  54       status = EXIT_FAILURE;
  55       error (0, errno, "getgroups failed");
  56     }
  57   if (setgroups (size, list) < 0)
  58     {
  59       if (errno == EPERM)
  60         status = EXIT_UNSUPPORTED;
  61       else
  62         {
  63           status = EXIT_FAILURE;
  64           error (0, errno, "setgroups failed");
  65         }
  66     }
  67
  68   if (status == EXIT_SUCCESS && setgroups (0, list) < 0)
  69     {
  70       status = EXIT_FAILURE;
  71       error (0, errno, "setgroups failed");
  72     }
  73
  74   xpthread_join (thread);
  75
  76   return status;
  77 }
  78
  79 #include <support/test-driver.c>