malloc/tst-memalign.c

   1 /* Test for memalign.
   2    Copyright (C) 2013-2024 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 <errno.h>
  20 #include <malloc.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <unistd.h>
  24 #include <libc-diag.h>
  25
  26 static int errors = 0;
  27
  28 static void
  29 merror (const char *msg)
  30 {
  31   ++errors;
  32   printf ("Error: %s\n", msg);
  33 }
  34
  35 static int
  36 do_test (void)
  37 {
  38   void *p;
  39   unsigned long pagesize = getpagesize ();
  40   unsigned long ptrval;
  41   int save;
  42
  43   errno = 0;
  44
  45   DIAG_PUSH_NEEDS_COMMENT;
  46 #if __GNUC_PREREQ (7, 0)
  47   /* GCC 7 warns about too-large allocations; here we want to test
  48      that they fail.  */
  49   DIAG_IGNORE_NEEDS_COMMENT (7, "-Walloc-size-larger-than=");
  50 #endif
  51   /* An attempt to allocate a huge value should return NULL and set
  52      errno to ENOMEM.  */
  53   p = memalign (sizeof (void *), -1);
  54 #if __GNUC_PREREQ (7, 0)
  55   DIAG_POP_NEEDS_COMMENT;
  56 #endif
  57
  58   save = errno;
  59
  60   if (p != NULL)
  61     merror ("memalign (sizeof (void *), -1) succeeded.");
  62
  63   if (p == NULL && save != ENOMEM)
  64     merror ("memalign (sizeof (void *), -1) errno is not set correctly");
  65
  66   free (p);
  67
  68   errno = 0;
  69
  70   /* Test to expose integer overflow in malloc internals from BZ #15857.  */
  71   p = memalign (pagesize, -pagesize);
  72
  73   save = errno;
  74
  75   if (p != NULL)
  76     merror ("memalign (pagesize, -pagesize) succeeded.");
  77
  78   if (p == NULL && save != ENOMEM)
  79     merror ("memalign (pagesize, -pagesize) errno is not set correctly");
  80
  81   free (p);
  82
  83   errno = 0;
  84
  85   /* Test to expose integer overflow in malloc internals from BZ #16038.  */
  86   p = memalign (-1, pagesize);
  87
  88   save = errno;
  89
  90   if (p != NULL)
  91     merror ("memalign (-1, pagesize) succeeded.");
  92
  93   if (p == NULL && save != EINVAL)
  94     merror ("memalign (-1, pagesize) errno is not set correctly");
  95
  96   free (p);
  97
  98   /* A zero-sized allocation should succeed with glibc, returning a
  99      non-NULL value.  */
 100   p = memalign (sizeof (void *), 0);
 101
 102   if (p == NULL)
 103     merror ("memalign (sizeof (void *), 0) failed.");
 104
 105   free (p);
 106
 107   /* Check the alignment of the returned pointer is correct.  */
 108   p = memalign (0x100, 10);
 109
 110   if (p == NULL)
 111     merror ("memalign (0x100, 10) failed.");
 112
 113   ptrval = (unsigned long) p;
 114
 115   if ((ptrval & 0xff) != 0)
 116     merror ("pointer is not aligned to 0x100");
 117
 118   free (p);
 119
 120   return errors != 0;
 121 }
 122
 123 #define TEST_FUNCTION do_test ()
 124 #include "../test-skeleton.c"