malloc/tst-valloc.c

   1 /* Test for valloc.
   2    Copyright (C) 2013-2017 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <stdlib.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <unistd.h>
  24
  25 static int errors = 0;
  26
  27 static void
  28 merror (const char *msg)
  29 {
  30   ++errors;
  31   printf ("Error: %s\n", msg);
  32 }
  33
  34 static int
  35 do_test (void)
  36 {
  37   void *p;
  38   unsigned long pagesize = getpagesize ();
  39   unsigned long ptrval;
  40   int save;
  41
  42   errno = 0;
  43
  44   /* An attempt to allocate a huge value should return NULL and set
  45      errno to ENOMEM.  */
  46   p = valloc (-1);
  47
  48   save = errno;
  49
  50   if (p != NULL)
  51     merror ("valloc (-1) succeeded.");
  52
  53   if (p == NULL && save != ENOMEM)
  54     merror ("valloc (-1) errno is not set correctly");
  55
  56   free (p);
  57
  58   errno = 0;
  59
  60   /* Test to expose integer overflow in malloc internals from BZ #15856.  */
  61   p = valloc (-pagesize);
  62
  63   save = errno;
  64
  65   if (p != NULL)
  66     merror ("valloc (-pagesize) succeeded.");
  67
  68   if (p == NULL && save != ENOMEM)
  69     merror ("valloc (-pagesize) errno is not set correctly");
  70
  71   free (p);
  72
  73   /* A zero-sized allocation should succeed with glibc, returning a
  74      non-NULL value.  */
  75   p = valloc (0);
  76
  77   if (p == NULL)
  78     merror ("valloc (0) failed.");
  79
  80   free (p);
  81
  82   /* Check the alignment of the returned pointer is correct.  */
  83   p = valloc (32);
  84
  85   if (p == NULL)
  86     merror ("valloc (32) failed.");
  87
  88   ptrval = (unsigned long) p;
  89
  90   if ((ptrval & (pagesize - 1)) != 0)
  91     merror ("returned pointer is not page aligned.");
  92
  93   free (p);
  94
  95   return errors != 0;
  96 }
  97
  98 #define TEST_FUNCTION do_test ()
  99 #include "../test-skeleton.c"