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5d28a896 | 1 | /* Basic tests for _dl_find_object. |
581c785b | 2 | Copyright (C) 2021-2022 Free Software Foundation, Inc. |
5d28a896 FW |
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 <dl-find_object.h> | |
20 | #include <dlfcn.h> | |
21 | #include <gnu/lib-names.h> | |
22 | #include <ldsodefs.h> | |
23 | #include <link.h> | |
24 | #include <stdio.h> | |
25 | #include <support/check.h> | |
26 | #include <support/xdlfcn.h> | |
27 | ||
28 | /* Use data objects for testing, so that it is not necessary to decode | |
29 | function descriptors on architectures that have them. */ | |
30 | static char main_program_data; | |
31 | ||
32 | /* Computes the expected _dl_find_object result directly from the | |
33 | map. */ | |
34 | static void | |
35 | from_map (struct link_map *l, struct dl_find_object *expected) | |
36 | { | |
37 | struct dl_find_object_internal internal; | |
38 | _dl_find_object_from_map (l, &internal); | |
39 | _dl_find_object_to_external (&internal, expected); | |
40 | } | |
41 | ||
42 | /* Compare _dl_find_object result at ADDRESS with *EXPECTED. */ | |
43 | static void | |
44 | check (void *address, | |
45 | struct dl_find_object *expected, int line) | |
46 | { | |
47 | struct dl_find_object actual; | |
48 | int ret = _dl_find_object (address, &actual); | |
49 | if (expected == NULL) | |
50 | { | |
51 | if (ret != -1) | |
52 | { | |
53 | support_record_failure (); | |
54 | printf ("%s:%d: unexpected success for %p\n", | |
55 | __FILE__, line, address); | |
56 | } | |
57 | return; | |
58 | } | |
59 | if (ret != 0) | |
60 | { | |
61 | support_record_failure (); | |
62 | printf ("%s:%d: unexpected failure for %p\n", | |
63 | __FILE__, line, address); | |
64 | return; | |
65 | } | |
66 | ||
67 | if (actual.dlfo_flags != expected->dlfo_flags) | |
68 | { | |
69 | support_record_failure (); | |
70 | printf ("%s:%d: error: %p: flags is %llu, expected %llu\n", | |
71 | __FILE__, line, address, | |
72 | actual.dlfo_flags, expected->dlfo_flags); | |
73 | } | |
06200aac | 74 | if (expected->dlfo_link_map->l_contiguous) |
5d28a896 | 75 | { |
06200aac FW |
76 | /* If the mappings are not contiguous, the actual and execpted |
77 | mappings may differ, so this subtest will not work. */ | |
78 | if (actual.dlfo_flags != expected->dlfo_flags) | |
79 | { | |
80 | support_record_failure (); | |
81 | printf ("%s:%d: error: %p: map start is %p, expected %p\n", | |
82 | __FILE__, line, | |
83 | address, actual.dlfo_map_start, expected->dlfo_map_start); | |
84 | } | |
85 | if (actual.dlfo_map_end != expected->dlfo_map_end) | |
86 | { | |
87 | support_record_failure (); | |
88 | printf ("%s:%d: error: %p: map end is %p, expected %p\n", | |
89 | __FILE__, line, | |
90 | address, actual.dlfo_map_end, expected->dlfo_map_end); | |
91 | } | |
5d28a896 FW |
92 | } |
93 | if (actual.dlfo_link_map != expected->dlfo_link_map) | |
94 | { | |
95 | support_record_failure (); | |
96 | printf ("%s:%d: error: %p: link map is %p, expected %p\n", | |
97 | __FILE__, line, | |
98 | address, actual.dlfo_link_map, expected->dlfo_link_map); | |
99 | } | |
100 | if (actual.dlfo_eh_frame != expected->dlfo_eh_frame) | |
101 | { | |
102 | support_record_failure (); | |
103 | printf ("%s:%d: error: %p: EH frame is %p, expected %p\n", | |
104 | __FILE__, line, | |
105 | address, actual.dlfo_eh_frame, expected->dlfo_eh_frame); | |
106 | } | |
107 | #if DLFO_STRUCT_HAS_EH_DBASE | |
108 | if (actual.dlfo_eh_dbase != expected->dlfo_eh_dbase) | |
109 | { | |
110 | support_record_failure (); | |
111 | printf ("%s:%d: error: %p: data base is %p, expected %p\n", | |
112 | __FILE__, line, | |
113 | address, actual.dlfo_eh_dbase, expected->dlfo_eh_dbase); | |
114 | } | |
115 | #endif | |
116 | #if DLFO_STRUCT_HAS_EH_COUNT | |
117 | if (actual.dlfo_eh_count != expected->dlfo_eh_count) | |
118 | { | |
119 | support_record_failure (); | |
120 | printf ("%s:%d: error: %p: count is %d, expected %d\n", | |
121 | __FILE__, line, | |
122 | address, actual.dlfo_eh_count, expected->dlfo_eh_count); | |
123 | } | |
124 | #endif | |
125 | } | |
126 | ||
127 | /* Check that unwind data for the main executable and the dynamic | |
128 | linker can be found. */ | |
129 | static void | |
130 | check_initial (void) | |
131 | { | |
132 | #ifndef FOR_STATIC | |
133 | /* Avoid direct reference, which could lead to copy relocations. */ | |
134 | struct r_debug *debug = xdlsym (NULL, "_r_debug"); | |
135 | TEST_VERIFY_EXIT (debug != NULL); | |
136 | char **tzname = xdlsym (NULL, "tzname"); | |
137 | ||
138 | /* The main executable has an unnamed link map. */ | |
139 | struct link_map *main_map = (struct link_map *) debug->r_map; | |
140 | TEST_COMPARE_STRING (main_map->l_name, ""); | |
141 | ||
142 | /* The link map of the dynamic linker. */ | |
143 | struct link_map *rtld_map = xdlopen (LD_SO, RTLD_LAZY | RTLD_NOLOAD); | |
144 | TEST_VERIFY_EXIT (rtld_map != NULL); | |
145 | ||
146 | /* The link map of libc.so. */ | |
147 | struct link_map *libc_map = xdlopen (LIBC_SO, RTLD_LAZY | RTLD_NOLOAD); | |
148 | TEST_VERIFY_EXIT (libc_map != NULL); | |
149 | ||
150 | struct dl_find_object expected; | |
151 | ||
152 | /* Data in the main program. */ | |
153 | from_map (main_map, &expected); | |
154 | check (&main_program_data, &expected, __LINE__); | |
155 | /* Corner cases for the mapping. */ | |
156 | check ((void *) main_map->l_map_start, &expected, __LINE__); | |
157 | check ((void *) (main_map->l_map_end - 1), &expected, __LINE__); | |
158 | ||
159 | /* Data in the dynamic loader. */ | |
160 | from_map (rtld_map, &expected); | |
161 | check (debug, &expected, __LINE__); | |
162 | check ((void *) rtld_map->l_map_start, &expected, __LINE__); | |
163 | check ((void *) (rtld_map->l_map_end - 1), &expected, __LINE__); | |
164 | ||
165 | /* Data in libc. */ | |
166 | from_map (libc_map, &expected); | |
167 | check (tzname, &expected, __LINE__); | |
168 | check ((void *) libc_map->l_map_start, &expected, __LINE__); | |
169 | check ((void *) (libc_map->l_map_end - 1), &expected, __LINE__); | |
170 | #endif | |
171 | } | |
172 | ||
173 | static int | |
174 | do_test (void) | |
175 | { | |
176 | { | |
177 | struct dl_find_object dlfo = { }; | |
178 | int ret = _dl_find_object (&main_program_data, &dlfo); | |
179 | printf ("info: main program unwind data: %p (%d)\n", | |
180 | dlfo.dlfo_eh_frame, ret); | |
181 | TEST_COMPARE (ret, 0); | |
182 | TEST_VERIFY (dlfo.dlfo_eh_frame != NULL); | |
183 | } | |
184 | ||
185 | check_initial (); | |
186 | ||
187 | /* dlopen-based test. First an object that can be dlclosed. */ | |
188 | struct link_map *mod1 = xdlopen ("tst-dl_find_object-mod1.so", RTLD_NOW); | |
189 | void *mod1_data = xdlsym (mod1, "mod1_data"); | |
190 | void *map_start = (void *) mod1->l_map_start; | |
191 | void *map_end = (void *) (mod1->l_map_end - 1); | |
192 | check_initial (); | |
193 | ||
194 | struct dl_find_object expected; | |
195 | from_map (mod1, &expected); | |
196 | check (mod1_data, &expected, __LINE__); | |
197 | check (map_start, &expected, __LINE__); | |
198 | check (map_end, &expected, __LINE__); | |
199 | ||
200 | /* Unloading must make the data unavailable. */ | |
201 | xdlclose (mod1); | |
202 | check_initial (); | |
203 | check (mod1_data, NULL, __LINE__); | |
204 | check (map_start, NULL, __LINE__); | |
205 | check (map_end, NULL, __LINE__); | |
206 | ||
207 | /* Now try a NODELETE load. */ | |
208 | struct link_map *mod2 = xdlopen ("tst-dl_find_object-mod2.so", RTLD_NOW); | |
4974c7cd | 209 | void *mod2_data = xdlsym (mod2, "mod2_data"); |
5d28a896 FW |
210 | map_start = (void *) mod2->l_map_start; |
211 | map_end = (void *) (mod2->l_map_end - 1); | |
212 | check_initial (); | |
213 | from_map (mod2, &expected); | |
214 | check (mod2_data, &expected, __LINE__); | |
215 | check (map_start, &expected, __LINE__); | |
216 | check (map_end, &expected, __LINE__); | |
217 | dlclose (mod2); /* Does nothing due to NODELETE. */ | |
218 | check_initial (); | |
219 | check (mod2_data, &expected, __LINE__); | |
220 | check (map_start, &expected, __LINE__); | |
221 | check (map_end, &expected, __LINE__); | |
222 | ||
223 | /* Now load again the first module. */ | |
224 | mod1 = xdlopen ("tst-dl_find_object-mod1.so", RTLD_NOW); | |
225 | mod1_data = xdlsym (mod1, "mod1_data"); | |
226 | map_start = (void *) mod1->l_map_start; | |
227 | map_end = (void *) (mod1->l_map_end - 1); | |
228 | check_initial (); | |
229 | from_map (mod1, &expected); | |
230 | check (mod1_data, &expected, __LINE__); | |
231 | check (map_start, &expected, __LINE__); | |
232 | check (map_end, &expected, __LINE__); | |
233 | ||
234 | /* Check that _dl_find_object works from a shared object (mostly for | |
235 | static dlopen). */ | |
236 | __typeof (_dl_find_object) *find_object | |
237 | = *(void **) xdlsym (mod2, "find_object"); | |
238 | struct dl_find_object actual; | |
239 | TEST_COMPARE (find_object (&main_program_data, &actual), 0); | |
240 | check (&main_program_data, &actual, __LINE__); /* Reversed check. */ | |
241 | ||
242 | return 0; | |
243 | } | |
244 | ||
245 | #include <support/test-driver.c> |