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