]>
Commit | Line | Data |
---|---|---|
591236f1 AH |
1 | /* Test ldconfig after /etc/ld.so.conf update and verify that a running process |
2 | observes changes to /etc/ld.so.cache. | |
3 | ||
6d7e8eda | 4 | Copyright (C) 2019-2023 Free Software Foundation, Inc. |
591236f1 AH |
5 | This file is part of the GNU C Library. |
6 | ||
7 | The GNU C Library is free software; you can redistribute it and/or | |
8 | modify it under the terms of the GNU Lesser General Public License as | |
9 | published by the Free Software Foundation; either version 2.1 of the | |
10 | License, or (at your option) any later version. | |
11 | ||
12 | The GNU C Library is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public | |
18 | License along with the GNU C Library; see the file COPYING.LIB. If | |
19 | not, see <https://www.gnu.org/licenses/>. */ | |
20 | ||
21 | #include <stdio.h> | |
22 | #include <stdlib.h> | |
23 | #include <string.h> | |
24 | #include <errno.h> | |
25 | ||
26 | #include <support/capture_subprocess.h> | |
27 | #include <support/check.h> | |
28 | #include <support/support.h> | |
29 | #include <support/xdlfcn.h> | |
30 | #include <support/xstdio.h> | |
31 | #include <support/xunistd.h> | |
32 | ||
33 | ||
34 | #define DSO "libldconfig-ld-mod.so" | |
35 | #define DSO_DIR "/tmp/tst-ldconfig" | |
36 | #define CONF "/etc/ld.so.conf" | |
37 | ||
38 | ||
39 | static void | |
40 | run_ldconfig (void *x __attribute__((unused))) | |
41 | { | |
42 | char *prog = xasprintf ("%s/ldconfig", support_install_rootsbindir); | |
43 | char *args[] = { prog, NULL }; | |
44 | ||
45 | execv (args[0], args); | |
46 | FAIL_EXIT1 ("execv: %m"); | |
47 | } | |
48 | ||
49 | ||
50 | /* Create a new directory. | |
51 | Copy a test shared object there. | |
52 | Try to dlopen it by soname. This should fail. | |
53 | (Directory is not searched.) | |
54 | Run ldconfig. | |
55 | Try to dlopen it again. It should still fail. | |
56 | (Directory is still not searched.) | |
57 | Add the directory to /etc/ld.so.conf. | |
58 | Try to dlopen it again. It should still fail. | |
59 | (The loader does not read /etc/ld.so.conf, only /etc/ld.so.cache.) | |
60 | Run ldconfig. | |
61 | Try to dlopen it again. This should finally succeed. */ | |
62 | static int | |
63 | do_test (void) | |
64 | { | |
65 | struct support_capture_subprocess result; | |
66 | ||
67 | /* Create the needed directories. */ | |
68 | xmkdirp ("/var/cache/ldconfig", 0777); | |
69 | xmkdirp (DSO_DIR, 0777); | |
70 | ||
71 | /* Rename the DSO to start with "lib" because there's an undocumented | |
72 | filter in ldconfig where it ignores any file that doesn't start with | |
73 | "lib" (for regular shared libraries) or "ld-" (for ld-linux-*). */ | |
3c8639b0 SL |
74 | char *mod_src_path = xasprintf ("%s/tst-ldconfig-ld-mod.so", |
75 | support_libdir_prefix); | |
76 | if (rename (mod_src_path, "/tmp/tst-ldconfig/libldconfig-ld-mod.so")) | |
591236f1 | 77 | FAIL_EXIT1 ("Renaming/moving the DSO failed: %m"); |
3c8639b0 | 78 | free (mod_src_path); |
591236f1 AH |
79 | |
80 | ||
81 | /* Open the DSO. We expect this to fail - tst-ldconfig directory | |
82 | is not searched. */ | |
83 | TEST_VERIFY_EXIT (dlopen (DSO, RTLD_NOW | RTLD_GLOBAL) == NULL); | |
84 | ||
85 | FILE *fp = xfopen (CONF, "a+"); | |
86 | if (!fp) | |
87 | FAIL_EXIT1 ("creating /etc/ld.so.conf failed: %m"); | |
88 | xfclose (fp); | |
89 | ||
90 | /* Run ldconfig. */ | |
91 | result = support_capture_subprocess (run_ldconfig, NULL); | |
92 | support_capture_subprocess_check (&result, "execv", 0, sc_allow_none); | |
93 | ||
94 | /* Try to dlopen the same DSO again, we expect this to fail again. */ | |
95 | TEST_VERIFY_EXIT (dlopen (DSO, RTLD_NOW | RTLD_GLOBAL) == NULL); | |
96 | ||
97 | /* Add tst-ldconfig directory to /etc/ld.so.conf. */ | |
98 | fp = xfopen (CONF, "w"); | |
99 | if (!(fwrite (DSO_DIR, 1, sizeof (DSO_DIR), fp))) | |
100 | FAIL_EXIT1 ("updating /etc/ld.so.conf failed: %m"); | |
101 | xfclose (fp); | |
102 | ||
103 | /* Try to dlopen the same DSO again, we expect this to still fail. */ | |
104 | TEST_VERIFY_EXIT (dlopen (DSO, RTLD_NOW | RTLD_GLOBAL) == NULL); | |
105 | ||
106 | /* Run ldconfig again. */ | |
107 | result = support_capture_subprocess (run_ldconfig, NULL); | |
108 | support_capture_subprocess_check (&result, "execv", 0, sc_allow_none); | |
109 | support_capture_subprocess_free (&result); | |
110 | ||
111 | /* Finally, we expect dlopen to pass now. */ | |
112 | TEST_VERIFY_EXIT (dlopen (DSO, RTLD_NOW | RTLD_GLOBAL) != NULL); | |
113 | ||
114 | return 0; | |
115 | } | |
116 | ||
117 | #include <support/test-driver.c> |