Commit | Line | Data |
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df08d338 JR |
1 | /* |
2 | * Copyright (C) 2019 Jonathan Rajotte <jonathan.rajotte-julien@efficios.com> | |
3 | * | |
4 | * SPDX-License-Identifier: LGPL-2.1-only | |
5 | * | |
6 | */ | |
7 | ||
58daac01 | 8 | #include <common/credentials.h> |
df08d338 | 9 | #include <common/error.h> |
6a751b95 JR |
10 | #include <common/hashtable/hashtable.h> |
11 | #include <common/hashtable/utils.h> | |
df08d338 | 12 | #include <common/macros.h> |
6a751b95 | 13 | #include <common/mi-lttng.h> |
df08d338 | 14 | #include <common/payload-view.h> |
6a751b95 | 15 | #include <common/payload.h> |
df08d338 JR |
16 | #include <common/runas.h> |
17 | #include <lttng/event-rule/event-rule-internal.h> | |
46fd07ac | 18 | #include <lttng/event-rule/kernel-uprobe-internal.h> |
df08d338 JR |
19 | #include <lttng/userspace-probe-internal.h> |
20 | ||
21 | #define IS_UPROBE_EVENT_RULE(rule) \ | |
46fd07ac | 22 | (lttng_event_rule_get_type(rule) == LTTNG_EVENT_RULE_TYPE_KERNEL_UPROBE) |
df08d338 | 23 | |
46fd07ac | 24 | static void lttng_event_rule_kernel_uprobe_destroy(struct lttng_event_rule *rule) |
df08d338 | 25 | { |
46fd07ac | 26 | struct lttng_event_rule_kernel_uprobe *uprobe; |
df08d338 | 27 | |
46fd07ac | 28 | uprobe = container_of(rule, struct lttng_event_rule_kernel_uprobe, parent); |
df08d338 JR |
29 | |
30 | lttng_userspace_probe_location_destroy(uprobe->location); | |
31 | free(uprobe->name); | |
32 | free(uprobe); | |
33 | } | |
34 | ||
46fd07ac | 35 | static bool lttng_event_rule_kernel_uprobe_validate( |
df08d338 JR |
36 | const struct lttng_event_rule *rule) |
37 | { | |
38 | bool valid = false; | |
46fd07ac | 39 | struct lttng_event_rule_kernel_uprobe *uprobe; |
df08d338 JR |
40 | |
41 | if (!rule) { | |
42 | goto end; | |
43 | } | |
44 | ||
46fd07ac | 45 | uprobe = container_of(rule, struct lttng_event_rule_kernel_uprobe, parent); |
df08d338 JR |
46 | |
47 | /* Required field. */ | |
48 | if (!uprobe->name) { | |
49 | ERR("Invalid uprobe event rule: a pattern must be set."); | |
50 | goto end; | |
51 | } | |
52 | ||
53 | if (!uprobe->location) { | |
54 | ERR("Invalid uprobe event rule: a location must be set."); | |
55 | goto end; | |
56 | } | |
57 | ||
58 | valid = true; | |
59 | end: | |
60 | return valid; | |
61 | } | |
62 | ||
46fd07ac | 63 | static int lttng_event_rule_kernel_uprobe_serialize( |
df08d338 JR |
64 | const struct lttng_event_rule *rule, |
65 | struct lttng_payload *payload) | |
66 | { | |
67 | int ret; | |
68 | size_t name_len, header_offset, size_before_probe; | |
46fd07ac JR |
69 | struct lttng_event_rule_kernel_uprobe *uprobe; |
70 | struct lttng_event_rule_kernel_uprobe_comm uprobe_comm = {}; | |
71 | struct lttng_event_rule_kernel_uprobe_comm *header; | |
df08d338 JR |
72 | |
73 | if (!rule || !IS_UPROBE_EVENT_RULE(rule)) { | |
74 | ret = -1; | |
75 | goto end; | |
76 | } | |
77 | ||
78 | header_offset = payload->buffer.size; | |
79 | ||
80 | DBG("Serializing uprobe event rule."); | |
46fd07ac | 81 | uprobe = container_of(rule, struct lttng_event_rule_kernel_uprobe, parent); |
df08d338 JR |
82 | |
83 | name_len = strlen(uprobe->name) + 1; | |
84 | ||
85 | uprobe_comm.name_len = name_len; | |
86 | ||
87 | ret = lttng_dynamic_buffer_append( | |
88 | &payload->buffer, &uprobe_comm, sizeof(uprobe_comm)); | |
89 | if (ret) { | |
90 | goto end; | |
91 | } | |
92 | ret = lttng_dynamic_buffer_append( | |
93 | &payload->buffer, uprobe->name, name_len); | |
94 | if (ret) { | |
95 | goto end; | |
96 | } | |
97 | ||
98 | size_before_probe = payload->buffer.size; | |
99 | ||
100 | /* This serialize return the size taken in the buffer. */ | |
101 | ret = lttng_userspace_probe_location_serialize( | |
102 | uprobe->location, payload); | |
103 | if (ret < 0) { | |
104 | goto end; | |
105 | } | |
106 | ||
107 | /* Update the header regarding the probe size. */ | |
46fd07ac | 108 | header = (struct lttng_event_rule_kernel_uprobe_comm |
df08d338 JR |
109 | *) ((char *) payload->buffer.data + |
110 | header_offset); | |
111 | header->location_len = payload->buffer.size - size_before_probe; | |
112 | ||
113 | ret = 0; | |
114 | ||
115 | end: | |
116 | return ret; | |
117 | } | |
118 | ||
46fd07ac | 119 | static bool lttng_event_rule_kernel_uprobe_is_equal(const struct lttng_event_rule *_a, |
df08d338 JR |
120 | const struct lttng_event_rule *_b) |
121 | { | |
122 | bool is_equal = false; | |
46fd07ac | 123 | struct lttng_event_rule_kernel_uprobe *a, *b; |
df08d338 | 124 | |
46fd07ac JR |
125 | a = container_of(_a, struct lttng_event_rule_kernel_uprobe, parent); |
126 | b = container_of(_b, struct lttng_event_rule_kernel_uprobe, parent); | |
df08d338 JR |
127 | |
128 | /* uprobe is invalid if this is not true. */ | |
a0377dfe FD |
129 | LTTNG_ASSERT(a->name); |
130 | LTTNG_ASSERT(b->name); | |
df08d338 JR |
131 | if (strcmp(a->name, b->name)) { |
132 | goto end; | |
133 | } | |
134 | ||
a0377dfe FD |
135 | LTTNG_ASSERT(a->location); |
136 | LTTNG_ASSERT(b->location); | |
df08d338 JR |
137 | is_equal = lttng_userspace_probe_location_is_equal( |
138 | a->location, b->location); | |
139 | end: | |
140 | return is_equal; | |
141 | } | |
142 | ||
46fd07ac | 143 | static enum lttng_error_code lttng_event_rule_kernel_uprobe_generate_filter_bytecode( |
58daac01 JR |
144 | struct lttng_event_rule *rule, |
145 | const struct lttng_credentials *creds) | |
df08d338 JR |
146 | { |
147 | /* Nothing to do. */ | |
148 | return LTTNG_OK; | |
149 | } | |
150 | ||
46fd07ac | 151 | static const char *lttng_event_rule_kernel_uprobe_get_filter( |
df08d338 JR |
152 | const struct lttng_event_rule *rule) |
153 | { | |
154 | /* Unsupported. */ | |
155 | return NULL; | |
156 | } | |
157 | ||
2b00d462 | 158 | static const struct lttng_bytecode * |
46fd07ac | 159 | lttng_event_rule_kernel_uprobe_get_filter_bytecode(const struct lttng_event_rule *rule) |
df08d338 JR |
160 | { |
161 | /* Unsupported. */ | |
162 | return NULL; | |
163 | } | |
164 | ||
993578ff | 165 | static enum lttng_event_rule_generate_exclusions_status |
46fd07ac | 166 | lttng_event_rule_kernel_uprobe_generate_exclusions(const struct lttng_event_rule *rule, |
993578ff | 167 | struct lttng_event_exclusion **exclusions) |
df08d338 JR |
168 | { |
169 | /* Unsupported. */ | |
993578ff JR |
170 | *exclusions = NULL; |
171 | return LTTNG_EVENT_RULE_GENERATE_EXCLUSIONS_STATUS_NONE; | |
df08d338 JR |
172 | } |
173 | ||
959e3c66 | 174 | static unsigned long |
46fd07ac | 175 | lttng_event_rule_kernel_uprobe_hash( |
959e3c66 JR |
176 | const struct lttng_event_rule *rule) |
177 | { | |
178 | unsigned long hash; | |
46fd07ac | 179 | struct lttng_event_rule_kernel_uprobe *urule = |
959e3c66 JR |
180 | container_of(rule, typeof(*urule), parent); |
181 | ||
46fd07ac | 182 | hash = hash_key_ulong((void *) LTTNG_EVENT_RULE_TYPE_KERNEL_UPROBE, |
959e3c66 JR |
183 | lttng_ht_seed); |
184 | hash ^= hash_key_str(urule->name, lttng_ht_seed); | |
185 | hash ^= lttng_userspace_probe_location_hash(urule->location); | |
186 | ||
187 | return hash; | |
188 | } | |
189 | ||
10685de6 JR |
190 | static |
191 | int userspace_probe_set_location( | |
46fd07ac | 192 | struct lttng_event_rule_kernel_uprobe *uprobe, |
10685de6 JR |
193 | const struct lttng_userspace_probe_location *location) |
194 | { | |
195 | int ret; | |
196 | struct lttng_userspace_probe_location *location_copy = NULL; | |
197 | ||
198 | if (!uprobe || !location || uprobe->location) { | |
199 | ret = -1; | |
200 | goto end; | |
201 | } | |
202 | ||
203 | location_copy = lttng_userspace_probe_location_copy(location); | |
204 | if (!location_copy) { | |
205 | ret = -1; | |
206 | goto end; | |
207 | } | |
208 | ||
209 | uprobe->location = location_copy; | |
210 | location_copy = NULL; | |
211 | ret = 0; | |
212 | end: | |
213 | lttng_userspace_probe_location_destroy(location_copy); | |
214 | return ret; | |
215 | } | |
216 | ||
6a751b95 JR |
217 | static enum lttng_error_code lttng_event_rule_kernel_uprobe_mi_serialize( |
218 | const struct lttng_event_rule *rule, struct mi_writer *writer) | |
219 | { | |
220 | int ret; | |
221 | enum lttng_error_code ret_code; | |
222 | enum lttng_event_rule_status status; | |
223 | const char *event_name = NULL; | |
224 | const struct lttng_userspace_probe_location *location = NULL; | |
225 | ||
a0377dfe FD |
226 | LTTNG_ASSERT(rule); |
227 | LTTNG_ASSERT(writer); | |
228 | LTTNG_ASSERT(IS_UPROBE_EVENT_RULE(rule)); | |
6a751b95 JR |
229 | |
230 | status = lttng_event_rule_kernel_uprobe_get_event_name( | |
231 | rule, &event_name); | |
a0377dfe FD |
232 | LTTNG_ASSERT(status == LTTNG_EVENT_RULE_STATUS_OK); |
233 | LTTNG_ASSERT(event_name); | |
6a751b95 JR |
234 | |
235 | status = lttng_event_rule_kernel_uprobe_get_location(rule, &location); | |
a0377dfe FD |
236 | LTTNG_ASSERT(status == LTTNG_EVENT_RULE_STATUS_OK); |
237 | LTTNG_ASSERT(location); | |
6a751b95 JR |
238 | |
239 | /* Open event rule kernel uprobe element. */ | |
240 | ret = mi_lttng_writer_open_element( | |
241 | writer, mi_lttng_element_event_rule_kernel_uprobe); | |
242 | if (ret) { | |
243 | goto mi_error; | |
244 | } | |
245 | ||
246 | /* Event name. */ | |
247 | ret = mi_lttng_writer_write_element_string(writer, | |
248 | mi_lttng_element_event_rule_event_name, event_name); | |
249 | if (ret) { | |
250 | goto mi_error; | |
251 | } | |
252 | ||
253 | /* Probe location. */ | |
254 | ret_code = lttng_userspace_probe_location_mi_serialize(location, writer); | |
255 | if (ret_code != LTTNG_OK) { | |
256 | goto end; | |
257 | } | |
258 | ||
259 | /* Close event rule kernel uprobe element. */ | |
260 | ret = mi_lttng_writer_close_element(writer); | |
261 | if (ret) { | |
262 | goto mi_error; | |
263 | } | |
264 | ||
265 | ret_code = LTTNG_OK; | |
266 | goto end; | |
267 | ||
268 | mi_error: | |
269 | ret_code = LTTNG_ERR_MI_IO_FAIL; | |
270 | end: | |
271 | return ret_code; | |
272 | } | |
273 | ||
46fd07ac | 274 | struct lttng_event_rule *lttng_event_rule_kernel_uprobe_create( |
10685de6 | 275 | const struct lttng_userspace_probe_location *location) |
df08d338 JR |
276 | { |
277 | struct lttng_event_rule *rule = NULL; | |
46fd07ac | 278 | struct lttng_event_rule_kernel_uprobe *urule; |
df08d338 | 279 | |
46fd07ac | 280 | urule = zmalloc(sizeof(struct lttng_event_rule_kernel_uprobe)); |
df08d338 JR |
281 | if (!urule) { |
282 | goto end; | |
283 | } | |
284 | ||
285 | rule = &urule->parent; | |
46fd07ac JR |
286 | lttng_event_rule_init(&urule->parent, LTTNG_EVENT_RULE_TYPE_KERNEL_UPROBE); |
287 | urule->parent.validate = lttng_event_rule_kernel_uprobe_validate; | |
288 | urule->parent.serialize = lttng_event_rule_kernel_uprobe_serialize; | |
289 | urule->parent.equal = lttng_event_rule_kernel_uprobe_is_equal; | |
290 | urule->parent.destroy = lttng_event_rule_kernel_uprobe_destroy; | |
df08d338 | 291 | urule->parent.generate_filter_bytecode = |
46fd07ac JR |
292 | lttng_event_rule_kernel_uprobe_generate_filter_bytecode; |
293 | urule->parent.get_filter = lttng_event_rule_kernel_uprobe_get_filter; | |
df08d338 | 294 | urule->parent.get_filter_bytecode = |
46fd07ac | 295 | lttng_event_rule_kernel_uprobe_get_filter_bytecode; |
df08d338 | 296 | urule->parent.generate_exclusions = |
46fd07ac JR |
297 | lttng_event_rule_kernel_uprobe_generate_exclusions; |
298 | urule->parent.hash = lttng_event_rule_kernel_uprobe_hash; | |
6a751b95 | 299 | urule->parent.mi_serialize = lttng_event_rule_kernel_uprobe_mi_serialize; |
1f1567a5 | 300 | |
10685de6 JR |
301 | if (userspace_probe_set_location(urule, location)) { |
302 | lttng_event_rule_destroy(rule); | |
303 | rule = NULL; | |
304 | } | |
305 | ||
df08d338 JR |
306 | end: |
307 | return rule; | |
308 | } | |
309 | ||
46fd07ac | 310 | ssize_t lttng_event_rule_kernel_uprobe_create_from_payload( |
df08d338 JR |
311 | struct lttng_payload_view *view, |
312 | struct lttng_event_rule **_event_rule) | |
313 | { | |
314 | ssize_t ret, offset = 0; | |
46fd07ac | 315 | const struct lttng_event_rule_kernel_uprobe_comm *uprobe_comm; |
df08d338 JR |
316 | const char *name; |
317 | struct lttng_buffer_view current_buffer_view; | |
318 | struct lttng_event_rule *rule = NULL; | |
10685de6 | 319 | struct lttng_userspace_probe_location *location = NULL; |
df08d338 JR |
320 | enum lttng_event_rule_status status; |
321 | ||
322 | if (!_event_rule) { | |
323 | ret = -1; | |
324 | goto end; | |
325 | } | |
326 | ||
df08d338 JR |
327 | current_buffer_view = lttng_buffer_view_from_view( |
328 | &view->buffer, offset, sizeof(*uprobe_comm)); | |
3e6e0df2 JG |
329 | if (!lttng_buffer_view_is_valid(¤t_buffer_view)) { |
330 | ERR("Failed to initialize from malformed event rule uprobe: buffer too short to contain header"); | |
df08d338 JR |
331 | ret = -1; |
332 | goto end; | |
333 | } | |
334 | ||
3e6e0df2 | 335 | uprobe_comm = (typeof(uprobe_comm)) current_buffer_view.data; |
df08d338 JR |
336 | |
337 | /* Skip to payload. */ | |
338 | offset += current_buffer_view.size; | |
339 | ||
340 | /* Map the name. */ | |
341 | current_buffer_view = lttng_buffer_view_from_view( | |
342 | &view->buffer, offset, uprobe_comm->name_len); | |
3e6e0df2 | 343 | if (!lttng_buffer_view_is_valid(¤t_buffer_view)) { |
df08d338 JR |
344 | ret = -1; |
345 | goto end; | |
346 | } | |
347 | ||
3e6e0df2 | 348 | name = current_buffer_view.data; |
df08d338 JR |
349 | if (!lttng_buffer_view_contains_string(¤t_buffer_view, name, |
350 | uprobe_comm->name_len)) { | |
351 | ret = -1; | |
352 | goto end; | |
353 | } | |
354 | ||
355 | /* Skip after the name. */ | |
356 | offset += uprobe_comm->name_len; | |
357 | ||
358 | /* Map the location. */ | |
3e6e0df2 JG |
359 | { |
360 | struct lttng_payload_view current_payload_view = | |
361 | lttng_payload_view_from_view(view, offset, | |
362 | uprobe_comm->location_len); | |
363 | ||
364 | if (!lttng_payload_view_is_valid(¤t_payload_view)) { | |
365 | ERR("Failed to initialize from malformed event rule uprobe: buffer too short to contain location"); | |
366 | ret = -1; | |
367 | goto end; | |
368 | } | |
369 | ||
370 | ret = lttng_userspace_probe_location_create_from_payload( | |
371 | ¤t_payload_view, &location); | |
372 | if (ret < 0) { | |
373 | ret = -1; | |
374 | goto end; | |
375 | } | |
df08d338 JR |
376 | } |
377 | ||
a0377dfe | 378 | LTTNG_ASSERT(ret == uprobe_comm->location_len); |
df08d338 JR |
379 | |
380 | /* Skip after the location. */ | |
381 | offset += uprobe_comm->location_len; | |
382 | ||
46fd07ac | 383 | rule = lttng_event_rule_kernel_uprobe_create(location); |
10685de6 JR |
384 | if (!rule) { |
385 | ERR("Failed to create event rule uprobe."); | |
386 | ret = -1; | |
387 | goto end; | |
388 | } | |
df08d338 | 389 | |
46fd07ac | 390 | status = lttng_event_rule_kernel_uprobe_set_event_name(rule, name); |
df08d338 JR |
391 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { |
392 | ret = -1; | |
393 | goto end; | |
394 | } | |
395 | ||
46fd07ac | 396 | if (!lttng_event_rule_kernel_uprobe_validate(rule)) { |
df08d338 JR |
397 | ret = -1; |
398 | goto end; | |
399 | } | |
400 | ||
401 | *_event_rule = rule; | |
402 | rule = NULL; | |
403 | ret = offset; | |
404 | end: | |
10685de6 | 405 | lttng_userspace_probe_location_destroy(location); |
df08d338 JR |
406 | lttng_event_rule_destroy(rule); |
407 | return ret; | |
408 | } | |
409 | ||
df08d338 | 410 | |
46fd07ac | 411 | enum lttng_event_rule_status lttng_event_rule_kernel_uprobe_get_location( |
df08d338 JR |
412 | const struct lttng_event_rule *rule, |
413 | const struct lttng_userspace_probe_location **location) | |
414 | { | |
415 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; | |
416 | ||
417 | if (!rule || !IS_UPROBE_EVENT_RULE(rule) || !location) { | |
418 | status = LTTNG_EVENT_RULE_STATUS_INVALID; | |
419 | goto end; | |
420 | } | |
421 | ||
46fd07ac | 422 | *location = lttng_event_rule_kernel_uprobe_get_location_mutable(rule); |
df08d338 JR |
423 | if (!*location) { |
424 | status = LTTNG_EVENT_RULE_STATUS_UNSET; | |
425 | goto end; | |
426 | } | |
427 | ||
428 | end: | |
429 | return status; | |
430 | } | |
431 | ||
df08d338 | 432 | struct lttng_userspace_probe_location * |
46fd07ac | 433 | lttng_event_rule_kernel_uprobe_get_location_mutable( |
df08d338 JR |
434 | const struct lttng_event_rule *rule) |
435 | { | |
46fd07ac | 436 | struct lttng_event_rule_kernel_uprobe *uprobe; |
df08d338 | 437 | |
a0377dfe | 438 | LTTNG_ASSERT(rule); |
46fd07ac | 439 | uprobe = container_of(rule, struct lttng_event_rule_kernel_uprobe, parent); |
df08d338 JR |
440 | |
441 | return uprobe->location; | |
442 | } | |
443 | ||
46fd07ac | 444 | enum lttng_event_rule_status lttng_event_rule_kernel_uprobe_set_event_name( |
df08d338 JR |
445 | struct lttng_event_rule *rule, const char *name) |
446 | { | |
447 | char *name_copy = NULL; | |
46fd07ac | 448 | struct lttng_event_rule_kernel_uprobe *uprobe; |
df08d338 JR |
449 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; |
450 | ||
451 | if (!rule || !IS_UPROBE_EVENT_RULE(rule) || !name || | |
452 | strlen(name) == 0) { | |
453 | status = LTTNG_EVENT_RULE_STATUS_INVALID; | |
454 | goto end; | |
455 | } | |
456 | ||
46fd07ac | 457 | uprobe = container_of(rule, struct lttng_event_rule_kernel_uprobe, parent); |
df08d338 JR |
458 | name_copy = strdup(name); |
459 | if (!name_copy) { | |
460 | status = LTTNG_EVENT_RULE_STATUS_ERROR; | |
461 | goto end; | |
462 | } | |
463 | ||
464 | if (uprobe->name) { | |
465 | free(uprobe->name); | |
466 | } | |
467 | ||
468 | uprobe->name = name_copy; | |
469 | name_copy = NULL; | |
470 | end: | |
471 | return status; | |
472 | } | |
473 | ||
46fd07ac | 474 | enum lttng_event_rule_status lttng_event_rule_kernel_uprobe_get_event_name( |
df08d338 JR |
475 | const struct lttng_event_rule *rule, const char **name) |
476 | { | |
46fd07ac | 477 | struct lttng_event_rule_kernel_uprobe *uprobe; |
df08d338 JR |
478 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; |
479 | ||
480 | if (!rule || !IS_UPROBE_EVENT_RULE(rule) || !name) { | |
481 | status = LTTNG_EVENT_RULE_STATUS_INVALID; | |
482 | goto end; | |
483 | } | |
484 | ||
46fd07ac | 485 | uprobe = container_of(rule, struct lttng_event_rule_kernel_uprobe, parent); |
df08d338 JR |
486 | if (!uprobe->name) { |
487 | status = LTTNG_EVENT_RULE_STATUS_UNSET; | |
488 | goto end; | |
489 | } | |
490 | ||
491 | *name = uprobe->name; | |
492 | end: | |
493 | return status; | |
494 | } |