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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 | ||
16 | #include <lttng/ust-dlfcn.h> | |
17 | #include <lttng/ust-elf.h> | |
97c7c238 | 18 | #include <lttng/ust-events.h> |
171fcc6f | 19 | #include <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 PW |
34 | |
35 | static | |
7b0fdd83 | 36 | void *_lttng_ust_dl_libc_dlopen(const char *filename, int flags) |
b13d93c2 PW |
37 | { |
38 | if (!__lttng_ust_plibc_dlopen) { | |
39 | __lttng_ust_plibc_dlopen = dlsym(RTLD_NEXT, "dlopen"); | |
8e2aed3f | 40 | if (!__lttng_ust_plibc_dlopen) { |
b13d93c2 PW |
41 | fprintf(stderr, "%s\n", dlerror()); |
42 | return NULL; | |
43 | } | |
44 | } | |
7b0fdd83 MD |
45 | return __lttng_ust_plibc_dlopen(filename, flags); |
46 | } | |
47 | ||
42330adc | 48 | #ifdef HAVE_DLMOPEN |
7b0fdd83 MD |
49 | static |
50 | void *_lttng_ust_dl_libc_dlmopen(Lmid_t nsid, const char *filename, | |
51 | int flags) | |
52 | { | |
53 | if (!__lttng_ust_plibc_dlmopen) { | |
54 | __lttng_ust_plibc_dlmopen = dlsym(RTLD_NEXT, "dlmopen"); | |
55 | if (!__lttng_ust_plibc_dlmopen) { | |
56 | fprintf(stderr, "%s\n", dlerror()); | |
57 | return NULL; | |
58 | } | |
59 | } | |
60 | return __lttng_ust_plibc_dlmopen(nsid, filename, flags); | |
b13d93c2 | 61 | } |
42330adc | 62 | #endif |
b13d93c2 PW |
63 | |
64 | static | |
65 | int _lttng_ust_dl_libc_dlclose(void *handle) | |
66 | { | |
67 | if (!__lttng_ust_plibc_dlclose) { | |
68 | __lttng_ust_plibc_dlclose = dlsym(RTLD_NEXT, "dlclose"); | |
8e2aed3f | 69 | if (!__lttng_ust_plibc_dlclose) { |
b13d93c2 PW |
70 | fprintf(stderr, "%s\n", dlerror()); |
71 | return -1; | |
72 | } | |
73 | } | |
74 | return __lttng_ust_plibc_dlclose(handle); | |
75 | } | |
76 | ||
77 | static | |
7b0fdd83 MD |
78 | void lttng_ust_dl_dlopen(void *so_base, const char *so_name, |
79 | int flags, void *ip) | |
b13d93c2 | 80 | { |
13436238 | 81 | char resolved_path[PATH_MAX]; |
8e2aed3f AB |
82 | struct lttng_ust_elf *elf; |
83 | uint64_t memsz; | |
83215d66 | 84 | uint8_t *build_id = NULL; |
8e2aed3f | 85 | size_t build_id_len; |
83215d66 | 86 | char *dbg_file = NULL; |
8e2aed3f AB |
87 | uint32_t crc; |
88 | int has_build_id = 0, has_debug_link = 0; | |
89 | int ret; | |
b13d93c2 | 90 | |
13436238 PW |
91 | if (!realpath(so_name, resolved_path)) { |
92 | ERR("could not resolve path '%s'", so_name); | |
93 | return; | |
b13d93c2 | 94 | } |
b13d93c2 | 95 | |
8e2aed3f AB |
96 | elf = lttng_ust_elf_create(resolved_path); |
97 | if (!elf) { | |
09026ccf | 98 | ERR("could not access file %s", resolved_path); |
13436238 | 99 | return; |
b13d93c2 | 100 | } |
13436238 | 101 | |
8e2aed3f AB |
102 | ret = lttng_ust_elf_get_memsz(elf, &memsz); |
103 | if (ret) { | |
104 | goto end; | |
105 | } | |
106 | ret = lttng_ust_elf_get_build_id( | |
107 | elf, &build_id, &build_id_len, &has_build_id); | |
108 | if (ret) { | |
109 | goto end; | |
110 | } | |
111 | ret = lttng_ust_elf_get_debug_link( | |
112 | elf, &dbg_file, &crc, &has_debug_link); | |
113 | if (ret) { | |
114 | goto end; | |
115 | } | |
116 | ||
6d4658aa | 117 | tracepoint(lttng_ust_dl, dlopen, |
7b0fdd83 | 118 | ip, so_base, resolved_path, flags, memsz, |
c5c4fd82 | 119 | has_build_id, has_debug_link); |
8e2aed3f AB |
120 | |
121 | if (has_build_id) { | |
122 | tracepoint(lttng_ust_dl, build_id, | |
123 | ip, so_base, build_id, build_id_len); | |
8e2aed3f AB |
124 | } |
125 | ||
126 | if (has_debug_link) { | |
127 | tracepoint(lttng_ust_dl, debug_link, | |
128 | ip, so_base, dbg_file, crc); | |
8e2aed3f AB |
129 | } |
130 | ||
131 | end: | |
83215d66 MD |
132 | free(dbg_file); |
133 | free(build_id); | |
8e2aed3f | 134 | lttng_ust_elf_destroy(elf); |
13436238 | 135 | return; |
b13d93c2 PW |
136 | } |
137 | ||
42330adc | 138 | #ifdef HAVE_DLMOPEN |
7b0fdd83 MD |
139 | static |
140 | void lttng_ust_dl_dlmopen(void *so_base, Lmid_t nsid, const char *so_name, | |
141 | int flags, void *ip) | |
142 | { | |
143 | char resolved_path[PATH_MAX]; | |
144 | struct lttng_ust_elf *elf; | |
145 | uint64_t memsz; | |
146 | uint8_t *build_id = NULL; | |
147 | size_t build_id_len; | |
148 | char *dbg_file = NULL; | |
149 | uint32_t crc; | |
150 | int has_build_id = 0, has_debug_link = 0; | |
151 | int ret; | |
152 | ||
153 | if (!realpath(so_name, resolved_path)) { | |
154 | ERR("could not resolve path '%s'", so_name); | |
155 | return; | |
156 | } | |
157 | ||
158 | elf = lttng_ust_elf_create(resolved_path); | |
159 | if (!elf) { | |
09026ccf | 160 | ERR("could not access file %s", resolved_path); |
7b0fdd83 MD |
161 | return; |
162 | } | |
163 | ||
164 | ret = lttng_ust_elf_get_memsz(elf, &memsz); | |
165 | if (ret) { | |
166 | goto end; | |
167 | } | |
168 | ret = lttng_ust_elf_get_build_id( | |
169 | elf, &build_id, &build_id_len, &has_build_id); | |
170 | if (ret) { | |
171 | goto end; | |
172 | } | |
173 | ret = lttng_ust_elf_get_debug_link( | |
174 | elf, &dbg_file, &crc, &has_debug_link); | |
175 | if (ret) { | |
176 | goto end; | |
177 | } | |
178 | ||
179 | tracepoint(lttng_ust_dl, dlmopen, | |
180 | ip, so_base, nsid, resolved_path, flags, memsz, | |
181 | has_build_id, has_debug_link); | |
182 | ||
183 | if (has_build_id) { | |
184 | tracepoint(lttng_ust_dl, build_id, | |
185 | ip, so_base, build_id, build_id_len); | |
186 | } | |
187 | ||
188 | if (has_debug_link) { | |
189 | tracepoint(lttng_ust_dl, debug_link, | |
190 | ip, so_base, dbg_file, crc); | |
191 | } | |
192 | ||
193 | end: | |
194 | free(dbg_file); | |
195 | free(build_id); | |
196 | lttng_ust_elf_destroy(elf); | |
197 | return; | |
198 | } | |
42330adc | 199 | #endif |
7b0fdd83 MD |
200 | |
201 | void *dlopen(const char *filename, int flags) | |
b13d93c2 | 202 | { |
8e2aed3f AB |
203 | void *handle; |
204 | ||
7b0fdd83 | 205 | handle = _lttng_ust_dl_libc_dlopen(filename, flags); |
bd703713 | 206 | if (__tracepoint_ptrs_registered && handle) { |
b13d93c2 | 207 | struct link_map *p = NULL; |
8e2aed3f AB |
208 | int ret; |
209 | ||
210 | ret = dlinfo(handle, RTLD_DI_LINKMAP, &p); | |
211 | if (ret != -1 && p != NULL && p->l_addr != 0) { | |
97c7c238 | 212 | lttng_ust_dl_dlopen((void *) p->l_addr, |
7b0fdd83 MD |
213 | p->l_name, flags, LTTNG_UST_CALLER_IP()); |
214 | } | |
215 | } | |
216 | lttng_ust_dl_update(LTTNG_UST_CALLER_IP()); | |
217 | return handle; | |
218 | } | |
219 | ||
42330adc | 220 | #ifdef HAVE_DLMOPEN |
7b0fdd83 MD |
221 | void *dlmopen(Lmid_t nsid, const char *filename, int flags) |
222 | { | |
223 | void *handle; | |
224 | ||
225 | handle = _lttng_ust_dl_libc_dlmopen(nsid, filename, flags); | |
226 | if (__tracepoint_ptrs_registered && handle) { | |
227 | struct link_map *p = NULL; | |
228 | int ret; | |
229 | ||
230 | ret = dlinfo(handle, RTLD_DI_LINKMAP, &p); | |
231 | if (ret != -1 && p != NULL && p->l_addr != 0) { | |
232 | lttng_ust_dl_dlmopen((void *) p->l_addr, | |
233 | nsid, p->l_name, flags, | |
171fcc6f | 234 | LTTNG_UST_CALLER_IP()); |
8e2aed3f | 235 | } |
b13d93c2 | 236 | } |
97c7c238 | 237 | lttng_ust_dl_update(LTTNG_UST_CALLER_IP()); |
b13d93c2 | 238 | return handle; |
7b0fdd83 | 239 | |
b13d93c2 | 240 | } |
42330adc | 241 | #endif |
b13d93c2 PW |
242 | |
243 | int dlclose(void *handle) | |
244 | { | |
97c7c238 MD |
245 | int ret; |
246 | ||
e7953e6e | 247 | if (__tracepoint_ptrs_registered) { |
b13d93c2 | 248 | struct link_map *p = NULL; |
8e2aed3f AB |
249 | |
250 | ret = dlinfo(handle, RTLD_DI_LINKMAP, &p); | |
251 | if (ret != -1 && p != NULL && p->l_addr != 0) { | |
252 | tracepoint(lttng_ust_dl, dlclose, | |
171fcc6f | 253 | LTTNG_UST_CALLER_IP(), |
8e2aed3f AB |
254 | (void *) p->l_addr); |
255 | } | |
b13d93c2 | 256 | } |
97c7c238 MD |
257 | ret = _lttng_ust_dl_libc_dlclose(handle); |
258 | lttng_ust_dl_update(LTTNG_UST_CALLER_IP()); | |
259 | return ret; | |
b13d93c2 | 260 | } |