malloc/tst-posix_memalign.c

   1 /* Test for posix_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 <stdlib.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   int ret;
  40   unsigned long pagesize = getpagesize ();
  41   unsigned long ptrval;
  42
  43   p = NULL;
  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 ENOMEM and
  52      p should remain NULL.  */
  53   ret = posix_memalign (&p, sizeof (void *), -1);
  54 #if __GNUC_PREREQ (7, 0)
  55   DIAG_POP_NEEDS_COMMENT;
  56 #endif
  57
  58   if (ret != ENOMEM)
  59     merror ("posix_memalign (&p, sizeof (void *), -1) succeeded.");
  60
  61   if (ret == ENOMEM && p != NULL)
  62     merror ("returned an error but pointer was modified");
  63
  64   free (p);
  65
  66   p = NULL;
  67
  68   /* Test to expose integer overflow in malloc internals from BZ #15857.  */
  69   ret = posix_memalign (&p, pagesize, -pagesize);
  70
  71   if (ret != ENOMEM)
  72     merror ("posix_memalign (&p, pagesize, -pagesize) succeeded.");
  73
  74   free (p);
  75
  76   p = NULL;
  77
  78   /* Test to expose integer overflow in malloc internals from BZ #16038.  */
  79   ret = posix_memalign (&p, -1, pagesize);
  80
  81   if (ret != EINVAL)
  82     merror ("posix_memalign (&p, -1, pagesize) succeeded.");
  83
  84   free (p);
  85
  86   p = NULL;
  87
  88   /* A zero-sized allocation should succeed with glibc, returning zero
  89      and setting p to a non-NULL value.  */
  90   ret = posix_memalign (&p, sizeof (void *), 0);
  91
  92   if (ret != 0 || p == NULL)
  93     merror ("posix_memalign (&p, sizeof (void *), 0) failed.");
  94
  95   free (p);
  96
  97   ret = posix_memalign (&p, 0x300, 10);
  98
  99   if (ret != EINVAL)
 100     merror ("posix_memalign (&p, 0x300, 10) succeeded.");
 101
 102   ret = posix_memalign (&p, 0, 10);
 103
 104   if (ret != EINVAL)
 105     merror ("posix_memalign (&p, 0, 10) succeeded.");
 106
 107   p = NULL;
 108
 109   ret = posix_memalign (&p, 0x100, 10);
 110
 111   if (ret != 0)
 112     merror ("posix_memalign (&p, 0x100, 10) failed.");
 113
 114   if (ret == 0 && p == NULL)
 115     merror ("returned success but pointer is NULL");
 116
 117   ptrval = (unsigned long) p;
 118
 119   if (ret == 0 && (ptrval & 0xff) != 0)
 120     merror ("pointer is not aligned to 0x100");
 121
 122   free (p);
 123
 124   return errors != 0;
 125 }
 126
 127 #define TEST_FUNCTION do_test ()
 128 #include "../test-skeleton.c"