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ef4f9764 FW |
1 | /* Test driver for malloc interposition tests. |
2 | Copyright (C) 2016 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 License as | |
7 | published by the Free Software Foundation; either version 2.1 of the | |
8 | 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; see the file COPYING.LIB. If | |
17 | not, see <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <stdio.h> | |
20 | #include <stdlib.h> | |
21 | #include <string.h> | |
22 | #include <unistd.h> | |
23 | ||
24 | #if INTERPOSE_THREADS | |
25 | #include <pthread.h> | |
26 | #endif | |
27 | ||
28 | static int do_test (void); | |
29 | #define TEST_FUNCTION do_test () | |
30 | #include "../test-skeleton.c" | |
31 | ||
32 | /* Fills BUFFER with a test string. */ | |
33 | static void | |
34 | line_string (int number, char *buffer, size_t length) | |
35 | { | |
36 | for (size_t i = 0; i < length - 2; ++i) | |
37 | buffer[i] = 'A' + ((number + i) % 26); | |
38 | buffer[length - 2] = '\n'; | |
39 | buffer[length - 1] = '\0'; | |
40 | } | |
41 | ||
42 | /* Perform the tests. */ | |
43 | static void * | |
44 | run_tests (void *closure) | |
45 | { | |
46 | char *temp_file_path; | |
47 | int fd = create_temp_file ("tst-malloc-interpose", &temp_file_path); | |
48 | if (fd < 0) | |
49 | _exit (1); | |
50 | ||
51 | /* Line lengths excluding the line terminator. */ | |
52 | static const int line_lengths[] = { 0, 45, 80, 2, 8201, 0, 17, -1 }; | |
53 | ||
54 | /* Fill the test file with data. */ | |
55 | { | |
56 | FILE *fp = fdopen (fd, "w"); | |
57 | for (int lineno = 0; line_lengths[lineno] >= 0; ++lineno) | |
58 | { | |
59 | char buffer[line_lengths[lineno] + 2]; | |
60 | line_string (lineno, buffer, sizeof (buffer)); | |
61 | fprintf (fp, "%s", buffer); | |
62 | } | |
63 | ||
64 | if (ferror (fp)) | |
65 | { | |
66 | printf ("error: fprintf: %m\n"); | |
67 | _exit (1); | |
68 | } | |
69 | if (fclose (fp) != 0) | |
70 | { | |
71 | printf ("error: fclose: %m\n"); | |
72 | _exit (1); | |
73 | } | |
74 | } | |
75 | ||
76 | /* Read the test file. This tests libc-internal allocation with | |
77 | realloc. */ | |
78 | { | |
79 | FILE *fp = fopen (temp_file_path, "r"); | |
80 | ||
81 | char *actual = NULL; | |
82 | size_t actual_size = 0; | |
83 | for (int lineno = 0; ; ++lineno) | |
84 | { | |
85 | errno = 0; | |
86 | ssize_t result = getline (&actual, &actual_size, fp); | |
87 | if (result == 0) | |
88 | { | |
89 | printf ("error: invalid return value 0 from getline\n"); | |
90 | _exit (1); | |
91 | } | |
92 | if (result < 0 && errno != 0) | |
93 | { | |
94 | printf ("error: getline: %m\n"); | |
95 | _exit (1); | |
96 | } | |
97 | if (result < 0 && line_lengths[lineno] >= 0) | |
98 | { | |
99 | printf ("error: unexpected end of file after line %d\n", lineno); | |
100 | _exit (1); | |
101 | } | |
102 | if (result > 0 && line_lengths[lineno] < 0) | |
103 | { | |
104 | printf ("error: no end of file after line %d\n", lineno); | |
105 | _exit (1); | |
106 | } | |
107 | if (result == -1 && line_lengths[lineno] == -1) | |
108 | /* End of file reached as expected. */ | |
109 | break; | |
110 | ||
111 | if (result != line_lengths[lineno] + 1) | |
112 | { | |
113 | printf ("error: line length mismatch: expected %d, got %zd\n", | |
114 | line_lengths[lineno], result); | |
115 | _exit (1); | |
116 | } | |
117 | ||
118 | char expected[line_lengths[lineno] + 2]; | |
119 | line_string (lineno, expected, sizeof (expected)); | |
120 | if (strcmp (actual, expected) != 0) | |
121 | { | |
122 | printf ("error: line mismatch\n"); | |
123 | printf ("error: expected: [[%s]]\n", expected); | |
124 | printf ("error: actual: [[%s]]\n", actual); | |
125 | _exit (1); | |
126 | } | |
127 | } | |
128 | ||
129 | if (fclose (fp) != 0) | |
130 | { | |
131 | printf ("error: fclose (after reading): %m\n"); | |
132 | _exit (1); | |
133 | } | |
134 | } | |
135 | ||
136 | free (temp_file_path); | |
137 | ||
138 | /* Make sure that fork is working. */ | |
139 | pid_t pid = fork (); | |
140 | if (pid == -1) | |
141 | { | |
142 | printf ("error: fork: %m\n"); | |
143 | _exit (1); | |
144 | } | |
145 | enum { exit_code = 55 }; | |
146 | if (pid == 0) | |
147 | _exit (exit_code); | |
148 | int status; | |
149 | int ret = waitpid (pid, &status, 0); | |
150 | if (ret < 0) | |
151 | { | |
152 | printf ("error: waitpid: %m\n"); | |
153 | _exit (1); | |
154 | } | |
155 | if (!WIFEXITED (status) || WEXITSTATUS (status) != exit_code) | |
156 | { | |
157 | printf ("error: unexpected exit status from child process: %d\n", | |
158 | status); | |
159 | _exit (1); | |
160 | } | |
161 | ||
162 | return NULL; | |
163 | } | |
164 | ||
165 | /* This is used to detect if malloc has not been successfully | |
166 | interposed. The interposed malloc does not use brk/sbrk. */ | |
167 | static void *initial_brk; | |
168 | __attribute__ ((constructor)) | |
169 | static void | |
170 | set_initial_brk (void) | |
171 | { | |
172 | initial_brk = sbrk (0); | |
173 | } | |
174 | ||
175 | /* Terminate the process if the break value has been changed. */ | |
176 | __attribute__ ((destructor)) | |
177 | static void | |
178 | check_brk (void) | |
179 | { | |
180 | void *current = sbrk (0); | |
181 | if (current != initial_brk) | |
182 | { | |
183 | printf ("error: brk changed from %p to %p; no interposition?\n", | |
184 | initial_brk, current); | |
185 | _exit (1); | |
186 | } | |
187 | } | |
188 | ||
189 | static int | |
190 | do_test (void) | |
191 | { | |
192 | check_brk (); | |
193 | ||
194 | #if INTERPOSE_THREADS | |
195 | pthread_t thr = xpthread_create (NULL, run_tests, NULL); | |
196 | xpthread_join (thr); | |
197 | #else | |
198 | run_tests (NULL); | |
199 | #endif | |
200 | ||
201 | check_brk (); | |
202 | ||
203 | return 0; | |
204 | } |