io/tst-ftw-bz26353.c

   1 /* test ftw bz26353: Check whether stack overflow occurs when the value
   2    of the nopenfd parameter is too large.
   3
   4    Copyright (C) 2020-2021 Free Software Foundation, Inc.
   5    This file is part of the GNU C Library.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, see
  19    <https://www.gnu.org/licenses/>.  */
  20
  21 #include <stdlib.h>
  22 #include <stdio.h>
  23 #include <ftw.h>
  24 #include <errno.h>
  25 #include <sys/resource.h>
  26
  27 #include <support/temp_file.h>
  28 #include <support/capture_subprocess.h>
  29 #include <support/check.h>
  30
  31 static int
  32 my_func (const char *file, const struct stat *sb, int flag)
  33 {
  34   return 0;
  35 }
  36
  37 static int
  38 get_large_nopenfd (void)
  39 {
  40   struct rlimit r;
  41   TEST_COMPARE (getrlimit (RLIMIT_STACK, &r), 0);
  42   if (r.rlim_cur == RLIM_INFINITY)
  43     {
  44       r.rlim_cur = 8 * 1024 * 1024;
  45       TEST_COMPARE (setrlimit (RLIMIT_STACK, &r), 0);
  46     }
  47   return (int) r.rlim_cur;
  48 }
  49
  50 static void
  51 do_ftw (void *unused)
  52 {
  53   char *tempdir = support_create_temp_directory ("tst-bz26353");
  54   int large_nopenfd = get_large_nopenfd ();
  55   TEST_COMPARE (ftw (tempdir, my_func, large_nopenfd), 0);
  56   free (tempdir);
  57 }
  58
  59 /* Check whether stack overflow occurs.  */
  60 static int
  61 do_test (void)
  62 {
  63   struct support_capture_subprocess result;
  64   result = support_capture_subprocess (do_ftw, NULL);
  65   support_capture_subprocess_check (&result, "bz26353", 0, sc_allow_none);
  66   support_capture_subprocess_free (&result);
  67   return 0;
  68 }
  69
  70 #include <support/test-driver.c>