1/* Test for pvalloc.
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
26static int errors = 0;
27
28static void
29merror (const char *msg)
30{
31 ++errors;
32 printf (format: "Error: %s\n", msg);
33}
34
35static int
36do_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 = pvalloc (size: -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 (msg: "pvalloc (-1) succeeded.");
62
63 if (p == NULL && save != ENOMEM)
64 merror (msg: "pvalloc (-1) errno is not set correctly");
65
66 free (ptr: p);
67
68 errno = 0;
69
70 /* Test to expose integer overflow in malloc internals from BZ #15855. */
71 p = pvalloc (size: -pagesize);
72
73 save = errno;
74
75 if (p != NULL)
76 merror (msg: "pvalloc (-pagesize) succeeded.");
77
78 if (p == NULL && save != ENOMEM)
79 merror (msg: "pvalloc (-pagesize) errno is not set correctly");
80
81 free (ptr: p);
82
83 /* A zero-sized allocation should succeed with glibc, returning a
84 non-NULL value. */
85 p = pvalloc (size: 0);
86
87 if (p == NULL)
88 merror (msg: "pvalloc (0) failed.");
89
90 free (ptr: p);
91
92 /* Check the alignment of the returned pointer is correct. */
93 p = pvalloc (size: 32);
94
95 if (p == NULL)
96 merror (msg: "pvalloc (32) failed.");
97
98 ptrval = (unsigned long) p;
99
100 if ((ptrval & (pagesize - 1)) != 0)
101 merror (msg: "returned pointer is not page aligned.");
102
103 free (ptr: p);
104
105 return errors != 0;
106}
107
108#define TEST_FUNCTION do_test ()
109#include "../test-skeleton.c"
110

source code of glibc/malloc/tst-pvalloc.c