Commit | Line | Data |
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b13d93c2 | 1 | /* |
c0c0989a | 2 | * SPDX-License-Identifier: LGPL-2.1-only |
b13d93c2 | 3 | * |
c0c0989a MJ |
4 | * Copyright (C) 2013 Paul Woegerer <paul.woegerer@mentor.com> |
5 | * Copyright (C) 2015 Antoine Busque <abusque@efficios.com> | |
6 | * Copyright (C) 2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
b13d93c2 PW |
7 | */ |
8 | ||
1ddceb36 | 9 | #define _LGPL_SOURCE |
13436238 | 10 | #include <limits.h> |
8e2aed3f | 11 | #include <stdio.h> |
fb31eb73 | 12 | #include <stdint.h> |
13436238 | 13 | #include <sys/types.h> |
8e2aed3f AB |
14 | #include <unistd.h> |
15 | ||
ae4b659d | 16 | #include <ust-dlfcn.h> |
2adb7ad2 | 17 | #include <ust-elf.h> |
97c7c238 | 18 | #include <lttng/ust-events.h> |
864a1eda | 19 | #include <ust-helper.h> |
eb2b066f | 20 | #include "usterr-signal-safe.h" |
b13d93c2 | 21 | |
cbba5e04 MJ |
22 | #include "../liblttng-ust/ust-events-internal.h" |
23 | ||
8e2aed3f AB |
24 | /* Include link.h last else it conflicts with ust-dlfcn. */ |
25 | #include <link.h> | |
b13d93c2 | 26 | |
13436238 | 27 | #define TRACEPOINT_DEFINE |
6d4658aa | 28 | #include "ust_dl.h" |
13436238 | 29 | |
7b0fdd83 | 30 | static void *(*__lttng_ust_plibc_dlopen)(const char *filename, int flags); |
42330adc | 31 | #ifdef HAVE_DLMOPEN |
7b0fdd83 MD |
32 | static void *(*__lttng_ust_plibc_dlmopen)(Lmid_t nsid, const char *filename, |
33 | int flags); | |
42330adc | 34 | #endif |
b13d93c2 | 35 | static int (*__lttng_ust_plibc_dlclose)(void *handle); |
b13d93c2 | 36 | |
465a0d04 MJ |
37 | static |
38 | void _lttng_ust_dl_init(void) | |
39 | __attribute__((constructor)); | |
40 | static | |
2b6f4374 MJ |
41 | void _lttng_ust_dl_init(void) |
42 | { | |
43 | ust_err_init(); | |
44 | } | |
45 | ||
b13d93c2 | 46 | static |
7b0fdd83 | 47 | void *_lttng_ust_dl_libc_dlopen(const char *filename, int flags) |
b13d93c2 PW |
48 | { |
49 | if (!__lttng_ust_plibc_dlopen) { | |
50 | __lttng_ust_plibc_dlopen = dlsym(RTLD_NEXT, "dlopen"); | |
8e2aed3f | 51 | if (!__lttng_ust_plibc_dlopen) { |
b13d93c2 PW |
52 | fprintf(stderr, "%s\n", dlerror()); |
53 | return NULL; | |
54 | } | |
55 | } | |
7b0fdd83 MD |
56 | return __lttng_ust_plibc_dlopen(filename, flags); |
57 | } | |
58 | ||
42330adc | 59 | #ifdef HAVE_DLMOPEN |
7b0fdd83 MD |
60 | static |
61 | void *_lttng_ust_dl_libc_dlmopen(Lmid_t nsid, const char *filename, | |
62 | int flags) | |
63 | { | |
64 | if (!__lttng_ust_plibc_dlmopen) { | |
65 | __lttng_ust_plibc_dlmopen = dlsym(RTLD_NEXT, "dlmopen"); | |
66 | if (!__lttng_ust_plibc_dlmopen) { | |
67 | fprintf(stderr, "%s\n", dlerror()); | |
68 | return NULL; | |
69 | } | |
70 | } | |
71 | return __lttng_ust_plibc_dlmopen(nsid, filename, flags); | |
b13d93c2 | 72 | } |
42330adc | 73 | #endif |
b13d93c2 PW |
74 | |
75 | static | |
76 | int _lttng_ust_dl_libc_dlclose(void *handle) | |
77 | { | |
78 | if (!__lttng_ust_plibc_dlclose) { | |
79 | __lttng_ust_plibc_dlclose = dlsym(RTLD_NEXT, "dlclose"); | |
8e2aed3f | 80 | if (!__lttng_ust_plibc_dlclose) { |
b13d93c2 PW |
81 | fprintf(stderr, "%s\n", dlerror()); |
82 | return -1; | |
83 | } | |
84 | } | |
85 | return __lttng_ust_plibc_dlclose(handle); | |
86 | } | |
87 | ||
88 | static | |
7b0fdd83 MD |
89 | void lttng_ust_dl_dlopen(void *so_base, const char *so_name, |
90 | int flags, void *ip) | |
b13d93c2 | 91 | { |
13436238 | 92 | char resolved_path[PATH_MAX]; |
8e2aed3f AB |
93 | struct lttng_ust_elf *elf; |
94 | uint64_t memsz; | |
83215d66 | 95 | uint8_t *build_id = NULL; |
8e2aed3f | 96 | size_t build_id_len; |
83215d66 | 97 | char *dbg_file = NULL; |
8e2aed3f AB |
98 | uint32_t crc; |
99 | int has_build_id = 0, has_debug_link = 0; | |
100 | int ret; | |
b13d93c2 | 101 | |
13436238 PW |
102 | if (!realpath(so_name, resolved_path)) { |
103 | ERR("could not resolve path '%s'", so_name); | |
104 | return; | |
b13d93c2 | 105 | } |
b13d93c2 | 106 | |
8e2aed3f AB |
107 | elf = lttng_ust_elf_create(resolved_path); |
108 | if (!elf) { | |
09026ccf | 109 | ERR("could not access file %s", resolved_path); |
13436238 | 110 | return; |
b13d93c2 | 111 | } |
13436238 | 112 | |
8e2aed3f AB |
113 | ret = lttng_ust_elf_get_memsz(elf, &memsz); |
114 | if (ret) { | |
115 | goto end; | |
116 | } | |
117 | ret = lttng_ust_elf_get_build_id( | |
118 | elf, &build_id, &build_id_len, &has_build_id); | |
119 | if (ret) { | |
120 | goto end; | |
121 | } | |
122 | ret = lttng_ust_elf_get_debug_link( | |
123 | elf, &dbg_file, &crc, &has_debug_link); | |
124 | if (ret) { | |
125 | goto end; | |
126 | } | |
127 | ||
6d4658aa | 128 | tracepoint(lttng_ust_dl, dlopen, |
7b0fdd83 | 129 | ip, so_base, resolved_path, flags, memsz, |
c5c4fd82 | 130 | has_build_id, has_debug_link); |
8e2aed3f AB |
131 | |
132 | if (has_build_id) { | |
133 | tracepoint(lttng_ust_dl, build_id, | |
134 | ip, so_base, build_id, build_id_len); | |
8e2aed3f AB |
135 | } |
136 | ||
137 | if (has_debug_link) { | |
138 | tracepoint(lttng_ust_dl, debug_link, | |
139 | ip, so_base, dbg_file, crc); | |
8e2aed3f AB |
140 | } |
141 | ||
142 | end: | |
83215d66 MD |
143 | free(dbg_file); |
144 | free(build_id); | |
8e2aed3f | 145 | lttng_ust_elf_destroy(elf); |
13436238 | 146 | return; |
b13d93c2 PW |
147 | } |
148 | ||
42330adc | 149 | #ifdef HAVE_DLMOPEN |
7b0fdd83 MD |
150 | static |
151 | void lttng_ust_dl_dlmopen(void *so_base, Lmid_t nsid, const char *so_name, | |
152 | int flags, void *ip) | |
153 | { | |
154 | char resolved_path[PATH_MAX]; | |
155 | struct lttng_ust_elf *elf; | |
156 | uint64_t memsz; | |
157 | uint8_t *build_id = NULL; | |
158 | size_t build_id_len; | |
159 | char *dbg_file = NULL; | |
160 | uint32_t crc; | |
161 | int has_build_id = 0, has_debug_link = 0; | |
162 | int ret; | |
163 | ||
164 | if (!realpath(so_name, resolved_path)) { | |
165 | ERR("could not resolve path '%s'", so_name); | |
166 | return; | |
167 | } | |
168 | ||
169 | elf = lttng_ust_elf_create(resolved_path); | |
170 | if (!elf) { | |
09026ccf | 171 | ERR("could not access file %s", resolved_path); |
7b0fdd83 MD |
172 | return; |
173 | } | |
174 | ||
175 | ret = lttng_ust_elf_get_memsz(elf, &memsz); | |
176 | if (ret) { | |
177 | goto end; | |
178 | } | |
179 | ret = lttng_ust_elf_get_build_id( | |
180 | elf, &build_id, &build_id_len, &has_build_id); | |
181 | if (ret) { | |
182 | goto end; | |
183 | } | |
184 | ret = lttng_ust_elf_get_debug_link( | |
185 | elf, &dbg_file, &crc, &has_debug_link); | |
186 | if (ret) { | |
187 | goto end; | |
188 | } | |
189 | ||
190 | tracepoint(lttng_ust_dl, dlmopen, | |
191 | ip, so_base, nsid, resolved_path, flags, memsz, | |
192 | has_build_id, has_debug_link); | |
193 | ||
194 | if (has_build_id) { | |
195 | tracepoint(lttng_ust_dl, build_id, | |
196 | ip, so_base, build_id, build_id_len); | |
197 | } | |
198 | ||
199 | if (has_debug_link) { | |
200 | tracepoint(lttng_ust_dl, debug_link, | |
201 | ip, so_base, dbg_file, crc); | |
202 | } | |
203 | ||
204 | end: | |
205 | free(dbg_file); | |
206 | free(build_id); | |
207 | lttng_ust_elf_destroy(elf); | |
208 | return; | |
209 | } | |
42330adc | 210 | #endif |
7b0fdd83 MD |
211 | |
212 | void *dlopen(const char *filename, int flags) | |
b13d93c2 | 213 | { |
8e2aed3f AB |
214 | void *handle; |
215 | ||
7b0fdd83 | 216 | handle = _lttng_ust_dl_libc_dlopen(filename, flags); |
bd703713 | 217 | if (__tracepoint_ptrs_registered && handle) { |
b13d93c2 | 218 | struct link_map *p = NULL; |
8e2aed3f AB |
219 | int ret; |
220 | ||
221 | ret = dlinfo(handle, RTLD_DI_LINKMAP, &p); | |
222 | if (ret != -1 && p != NULL && p->l_addr != 0) { | |
97c7c238 | 223 | lttng_ust_dl_dlopen((void *) p->l_addr, |
7b0fdd83 MD |
224 | p->l_name, flags, LTTNG_UST_CALLER_IP()); |
225 | } | |
226 | } | |
227 | lttng_ust_dl_update(LTTNG_UST_CALLER_IP()); | |
228 | return handle; | |
229 | } | |
230 | ||
42330adc | 231 | #ifdef HAVE_DLMOPEN |
7b0fdd83 MD |
232 | void *dlmopen(Lmid_t nsid, const char *filename, int flags) |
233 | { | |
234 | void *handle; | |
235 | ||
236 | handle = _lttng_ust_dl_libc_dlmopen(nsid, filename, flags); | |
237 | if (__tracepoint_ptrs_registered && handle) { | |
238 | struct link_map *p = NULL; | |
239 | int ret; | |
240 | ||
241 | ret = dlinfo(handle, RTLD_DI_LINKMAP, &p); | |
242 | if (ret != -1 && p != NULL && p->l_addr != 0) { | |
243 | lttng_ust_dl_dlmopen((void *) p->l_addr, | |
244 | nsid, p->l_name, flags, | |
171fcc6f | 245 | LTTNG_UST_CALLER_IP()); |
8e2aed3f | 246 | } |
b13d93c2 | 247 | } |
97c7c238 | 248 | lttng_ust_dl_update(LTTNG_UST_CALLER_IP()); |
b13d93c2 | 249 | return handle; |
7b0fdd83 | 250 | |
b13d93c2 | 251 | } |
42330adc | 252 | #endif |
b13d93c2 PW |
253 | |
254 | int dlclose(void *handle) | |
255 | { | |
97c7c238 MD |
256 | int ret; |
257 | ||
e7953e6e | 258 | if (__tracepoint_ptrs_registered) { |
b13d93c2 | 259 | struct link_map *p = NULL; |
8e2aed3f AB |
260 | |
261 | ret = dlinfo(handle, RTLD_DI_LINKMAP, &p); | |
262 | if (ret != -1 && p != NULL && p->l_addr != 0) { | |
263 | tracepoint(lttng_ust_dl, dlclose, | |
171fcc6f | 264 | LTTNG_UST_CALLER_IP(), |
8e2aed3f AB |
265 | (void *) p->l_addr); |
266 | } | |
b13d93c2 | 267 | } |
97c7c238 MD |
268 | ret = _lttng_ust_dl_libc_dlclose(handle); |
269 | lttng_ust_dl_update(LTTNG_UST_CALLER_IP()); | |
270 | return ret; | |
b13d93c2 | 271 | } |