1 | /* Test for dlinfo (RTLD_DI_PHDR). |
2 | Copyright (C) 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 <dlfcn.h> |
20 | #include <link.h> |
21 | #include <stdbool.h> |
22 | #include <stdio.h> |
23 | #include <string.h> |
24 | #include <sys/auxv.h> |
25 | |
26 | #include <support/check.h> |
27 | #include <support/xdlfcn.h> |
28 | |
29 | /* Used to verify that the program header array appears as expected |
30 | among the dl_iterate_phdr callback invocations. */ |
31 | |
32 | struct dlip_callback_args |
33 | { |
34 | struct link_map *l; /* l->l_addr is used to find the object. */ |
35 | const ElfW(Phdr) *phdr; /* Expected program header pointed. */ |
36 | int phnum; /* Expected program header count. */ |
37 | bool found; /* True if l->l_addr has been found. */ |
38 | }; |
39 | |
40 | static int |
41 | dlip_callback (struct dl_phdr_info *dlpi, size_t size, void *closure) |
42 | { |
43 | TEST_COMPARE (sizeof (*dlpi), size); |
44 | struct dlip_callback_args *args = closure; |
45 | |
46 | if (dlpi->dlpi_addr == args->l->l_addr) |
47 | { |
48 | TEST_VERIFY (!args->found); |
49 | args->found = true; |
50 | TEST_VERIFY (args->phdr == dlpi->dlpi_phdr); |
51 | TEST_COMPARE (args->phnum, dlpi->dlpi_phnum); |
52 | } |
53 | |
54 | return 0; |
55 | } |
56 | |
57 | static int |
58 | do_test (void) |
59 | { |
60 | /* Avoid a copy relocation. */ |
61 | struct r_debug *debug = xdlsym (RTLD_DEFAULT, symbol: "_r_debug" ); |
62 | struct link_map *l = (struct link_map *) debug->r_map; |
63 | TEST_VERIFY_EXIT (l != NULL); |
64 | |
65 | do |
66 | { |
67 | printf (format: "info: checking link map %p (%p) for \"%s\"\n" , |
68 | l, l->l_phdr, l->l_name); |
69 | |
70 | /* Cause dlerror () to return an error message. */ |
71 | dlsym (RTLD_DEFAULT, name: "does-not-exist" ); |
72 | |
73 | /* Use the extension that link maps are valid dlopen handles. */ |
74 | const ElfW(Phdr) *phdr; |
75 | int phnum = dlinfo (handle: l, request: RTLD_DI_PHDR, arg: &phdr); |
76 | TEST_VERIFY (phnum >= 0); |
77 | /* Verify that the error message has been cleared. */ |
78 | TEST_COMPARE_STRING (dlerror (), NULL); |
79 | |
80 | TEST_VERIFY (phdr == l->l_phdr); |
81 | TEST_COMPARE (phnum, l->l_phnum); |
82 | |
83 | /* Check that we can find PT_DYNAMIC among the array. */ |
84 | { |
85 | bool dynamic_found = false; |
86 | for (int i = 0; i < phnum; ++i) |
87 | if (phdr[i].p_type == PT_DYNAMIC) |
88 | { |
89 | dynamic_found = true; |
90 | TEST_COMPARE ((ElfW(Addr)) l->l_ld, l->l_addr + phdr[i].p_vaddr); |
91 | } |
92 | TEST_VERIFY (dynamic_found); |
93 | } |
94 | |
95 | /* Check that dl_iterate_phdr finds the link map with the same |
96 | program headers. */ |
97 | { |
98 | struct dlip_callback_args args = |
99 | { |
100 | .l = l, |
101 | .phdr = phdr, |
102 | .phnum = phnum, |
103 | .found = false, |
104 | }; |
105 | TEST_COMPARE (dl_iterate_phdr (dlip_callback, &args), 0); |
106 | TEST_VERIFY (args.found); |
107 | } |
108 | |
109 | if (l->l_prev == NULL) |
110 | { |
111 | /* This is the executable, so the information is also |
112 | available via getauxval. */ |
113 | TEST_COMPARE_STRING (l->l_name, "" ); |
114 | TEST_VERIFY (phdr == (const ElfW(Phdr) *) getauxval (AT_PHDR)); |
115 | TEST_COMPARE (phnum, getauxval (AT_PHNUM)); |
116 | } |
117 | |
118 | l = l->l_next; |
119 | } |
120 | while (l != NULL); |
121 | |
122 | return 0; |
123 | } |
124 | |
125 | #include <support/test-driver.c> |
126 | |