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82eef55f | 1 | /* Compare dlvsym and __libc_dlvsym results. Common code. |
04277e02 | 2 | Copyright (C) 2017-2019 Free Software Foundation, Inc. |
82eef55f 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 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | /* compare_vsyms is the main entry point for these tests. | |
20 | ||
21 | Indirectly, It calls __libc_dlvsym (from libc.so; internal | |
22 | interface) and dlvsym (from libdl.so; public interface) to compare | |
23 | the results for a selected set of symbols in libc.so which | |
24 | typically have more than one symbol version. The two functions are | |
25 | implemented by somewhat different code, and this test checks that | |
26 | their results are the same. | |
27 | ||
28 | The versions are generated to range from GLIBC_2.0 to GLIBC_2.Y, | |
29 | with Y being the current __GLIBC_MINOR__ version plus two. In | |
30 | addition, there is a list of special symbol versions of the form | |
31 | GLIBC_2.Y.Z, which were used for some releases. | |
32 | ||
33 | Comparing the two dlvsym results at versions which do not actually | |
34 | exist does not test much, but it will not contribute to false test | |
35 | failures, either. */ | |
36 | ||
37 | #include <array_length.h> | |
38 | #include <gnu/lib-names.h> | |
39 | #include <stdbool.h> | |
40 | #include <stdio.h> | |
41 | #include <support/check.h> | |
42 | #include <support/xdlfcn.h> | |
43 | ||
44 | /* Run consistency check for versioned symbol NAME@VERSION. NB: We | |
45 | may execute in a shared object, so exit on error for proper error | |
46 | reporting. */ | |
47 | static void | |
48 | compare_vsyms_0 (void *libc_handle, const char *name, const char *version, | |
49 | bool *pfound) | |
50 | { | |
51 | void *dlvsym_address = dlvsym (libc_handle, name, version); | |
52 | void *libc_dlvsym_address | |
53 | = __libc_dlvsym (libc_handle, name, version); | |
54 | if (dlvsym_address != libc_dlvsym_address) | |
55 | FAIL_EXIT1 ("%s@%s mismatch: %p != %p", | |
56 | name, version, dlvsym_address, libc_dlvsym_address); | |
57 | if (dlvsym_address != NULL) | |
58 | *pfound = true; | |
59 | } | |
60 | ||
61 | ||
62 | /* Run consistency check for versioned symbol NAME at multiple symbol | |
63 | version. */ | |
64 | static void | |
65 | compare_vsyms_1 (void *libc_handle, const char *name) | |
66 | { | |
67 | bool found = false; | |
68 | ||
69 | /* Historic versions which do not follow the usual GLIBC_2.Y | |
70 | pattern, to increase test coverage. Not all architectures have | |
71 | those, but probing additional versions does not hurt. */ | |
72 | static const char special_versions[][12] = | |
73 | { | |
74 | "GLIBC_2.1.1", | |
75 | "GLIBC_2.1.2", | |
76 | "GLIBC_2.1.3", | |
77 | "GLIBC_2.1.4", | |
78 | "GLIBC_2.2.1", | |
79 | "GLIBC_2.2.2", | |
80 | "GLIBC_2.2.3", | |
81 | "GLIBC_2.2.4", | |
82 | "GLIBC_2.2.5", | |
83 | "GLIBC_2.2.6", | |
84 | "GLIBC_2.3.2", | |
85 | "GLIBC_2.3.3", | |
86 | "GLIBC_2.3.4", | |
87 | }; | |
88 | for (int i = 0; i < array_length (special_versions); ++i) | |
89 | compare_vsyms_0 (libc_handle, name, special_versions[i], &found); | |
90 | ||
91 | /* Iterate to an out-of-range version, to cover some unused symbols | |
92 | as well. */ | |
93 | for (int minor_version = 0; minor_version <= __GLIBC_MINOR__ + 2; | |
94 | ++minor_version) | |
95 | { | |
96 | char version[30]; | |
97 | snprintf (version, sizeof (version), "GLIBC_%d.%d", | |
98 | __GLIBC__, minor_version); | |
99 | compare_vsyms_0 (libc_handle, name, version, &found); | |
100 | } | |
101 | ||
102 | if (!found) | |
103 | FAIL_EXIT1 ("symbol %s not found at any version", name); | |
104 | } | |
105 | ||
106 | /* Run consistency checks for various symbols which usually have | |
107 | multiple versions. */ | |
108 | static void | |
109 | compare_vsyms (void) | |
110 | { | |
111 | /* The minor version loop in compare_vsyms_1 needs updating in case | |
112 | we ever switch to glibc 3.0. */ | |
113 | if (__GLIBC__ != 2) | |
114 | FAIL_EXIT1 ("unexpected glibc major version: %d", __GLIBC__); | |
115 | ||
116 | /* __libc_dlvsym does not recognize the special RTLD_* handles, so | |
117 | obtain an explicit handle for libc.so. */ | |
118 | void *libc_handle = xdlopen (LIBC_SO, RTLD_LAZY | RTLD_NOLOAD); | |
119 | ||
120 | compare_vsyms_1 (libc_handle, "_sys_errlist"); | |
121 | compare_vsyms_1 (libc_handle, "_sys_siglist"); | |
122 | compare_vsyms_1 (libc_handle, "quick_exit"); | |
123 | ||
124 | xdlclose (libc_handle); | |
125 | } |