1/* Test integer wraparound in hcreate.
2 Copyright (C) 2016-2022 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 <limits.h>
21#include <search.h>
22#include <stdbool.h>
23#include <stdio.h>
24#include <stdlib.h>
25#include <sys/resource.h>
26
27static void
28test_size (size_t size)
29{
30 int res = hcreate (nel: size);
31 if (res == 0)
32 {
33 if (errno == ENOMEM)
34 return;
35 printf (format: "error: hcreate (%zu): %m\n", size);
36 exit (1);
37 }
38 char *keys[100];
39 for (int i = 0; i < 100; ++i)
40 {
41 if (asprintf (ptr: keys + i, fmt: "%d", i) < 0)
42 {
43 printf (format: "error: asprintf: %m\n");
44 exit (1);
45 }
46 ENTRY e = { keys[i], (char *) "value" };
47 if (hsearch (item: e, action: ENTER) == NULL)
48 {
49 printf (format: "error: hsearch (\"%s\"): %m\n", keys[i]);
50 exit (1);
51 }
52 }
53 hdestroy ();
54
55 for (int i = 0; i < 100; ++i)
56 free (ptr: keys[i]);
57}
58
59static int
60do_test (void)
61{
62 /* Limit the size of the process, so that memory allocation will
63 fail without impacting the entire system. */
64 {
65 struct rlimit limit;
66 if (getrlimit (RLIMIT_AS, rlimits: &limit) != 0)
67 {
68 printf (format: "getrlimit (RLIMIT_AS) failed: %m\n");
69 return 1;
70 }
71 long target = 100 * 1024 * 1024;
72 if (limit.rlim_cur == RLIM_INFINITY || limit.rlim_cur > target)
73 {
74 limit.rlim_cur = target;
75 if (setrlimit (RLIMIT_AS, rlimits: &limit) != 0)
76 {
77 printf (format: "setrlimit (RLIMIT_AS) failed: %m\n");
78 return 1;
79 }
80 }
81 }
82
83 test_size (size: 500);
84 test_size (size: -1);
85 test_size (size: -3);
86 test_size (INT_MAX - 2);
87 test_size (INT_MAX - 1);
88 test_size (INT_MAX);
89 test_size (size: ((unsigned) INT_MAX) + 1);
90 test_size (UINT_MAX - 2);
91 test_size (UINT_MAX - 1);
92 test_size (UINT_MAX);
93 return 0;
94}
95
96#define TEST_FUNCTION do_test ()
97#include "../test-skeleton.c"
98

source code of glibc/misc/bug18240.c