misc/tst-mntent-blank-corrupt.c

   1 /* Make sure blank lines does not cause memory corruption BZ #18887.
   2
   3    Copyright (C) 2009-2023 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <mntent.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23
  24 /* Make sure blank lines don't trigger memory corruption.  This doesn't happen
  25    for all targets though, so it's a best effort test BZ #18887.  */
  26 static int
  27 do_test (void)
  28 {
  29   FILE *fp;
  30
  31   fp = tmpfile ();
  32   fputs ("\n \n/foo\\040dir /bar\\040dir auto bind \t \n", fp);
  33   rewind (fp);
  34
  35   /* The corruption happens here ...  */
  36   getmntent (fp);
  37   /* ... but triggers here.  */
  38   endmntent (fp);
  39
  40   /* If the test failed, we would crash, and not hit this point.  */
  41   return 0;
  42 }
  43
  44 #define TEST_FUNCTION do_test ()
  45 #include "../test-skeleton.c"