Commit | Line | Data |
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60b6c79c MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * | |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
60b6c79c MD |
8 | * |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
d14d33bf | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
60b6c79c MD |
12 | * more details. |
13 | * | |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
60b6c79c MD |
17 | */ |
18 | ||
6c1c0768 | 19 | #define _LGPL_SOURCE |
60b6c79c MD |
20 | #include <errno.h> |
21 | #include <limits.h> | |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
24 | #include <string.h> | |
25 | #include <sys/wait.h> | |
26 | #include <sys/types.h> | |
27 | #include <sys/stat.h> | |
28 | #include <unistd.h> | |
29 | #include <fcntl.h> | |
c2b75c49 | 30 | #include <sched.h> |
0452bf08 | 31 | #include <signal.h> |
749b7a0c | 32 | #include <assert.h> |
e1055edb | 33 | #include <signal.h> |
60b6c79c | 34 | |
0ef03255 | 35 | #include <common/lttng-kernel.h> |
90e535ef | 36 | #include <common/common.h> |
3fd15a74 | 37 | #include <common/utils.h> |
e8fa9fb0 | 38 | #include <common/compat/getenv.h> |
e1055edb | 39 | #include <common/compat/prctl.h> |
2038dd6c JG |
40 | #include <common/unix.h> |
41 | #include <common/defaults.h> | |
241e0a5a FD |
42 | #include <common/lttng-elf.h> |
43 | ||
44 | #include <lttng/constant.h> | |
60b6c79c | 45 | |
0857097f DG |
46 | #include "runas.h" |
47 | ||
7567352f | 48 | struct run_as_data; |
fe9f7760 FD |
49 | struct run_as_ret; |
50 | typedef int (*run_as_fct)(struct run_as_data *data, struct run_as_ret *ret_value); | |
c2b75c49 | 51 | |
e11d277b | 52 | struct run_as_mkdir_data { |
7567352f | 53 | char path[PATH_MAX]; |
60b6c79c MD |
54 | mode_t mode; |
55 | }; | |
56 | ||
e11d277b | 57 | struct run_as_open_data { |
7567352f | 58 | char path[PATH_MAX]; |
60b6c79c MD |
59 | int flags; |
60 | mode_t mode; | |
61 | }; | |
62 | ||
4628484a | 63 | struct run_as_unlink_data { |
7567352f | 64 | char path[PATH_MAX]; |
4628484a MD |
65 | }; |
66 | ||
7567352f MD |
67 | struct run_as_rmdir_recursive_data { |
68 | char path[PATH_MAX]; | |
69 | }; | |
70 | ||
241e0a5a FD |
71 | struct run_as_extract_elf_symbol_offset_data { |
72 | char function[LTTNG_SYMBOL_NAME_LEN]; | |
73 | }; | |
74 | ||
0ef03255 FD |
75 | struct run_as_extract_sdt_probe_offsets_data { |
76 | char probe_name[LTTNG_SYMBOL_NAME_LEN]; | |
77 | char provider_name[LTTNG_SYMBOL_NAME_LEN]; | |
78 | }; | |
79 | ||
fe9f7760 FD |
80 | struct run_as_mkdir_ret { |
81 | int ret; | |
82 | }; | |
83 | ||
84 | struct run_as_open_ret { | |
85 | int ret; | |
86 | }; | |
87 | ||
88 | struct run_as_unlink_ret { | |
89 | int ret; | |
90 | }; | |
91 | ||
92 | struct run_as_rmdir_recursive_ret { | |
93 | int ret; | |
94 | }; | |
95 | ||
241e0a5a FD |
96 | struct run_as_extract_elf_symbol_offset_ret { |
97 | uint64_t offset; | |
98 | }; | |
99 | ||
0ef03255 FD |
100 | struct run_as_extract_sdt_probe_offsets_ret { |
101 | uint32_t num_offset; | |
102 | uint64_t offsets[LTTNG_KERNEL_MAX_UPROBE_NUM]; | |
103 | }; | |
104 | ||
7567352f MD |
105 | enum run_as_cmd { |
106 | RUN_AS_MKDIR, | |
107 | RUN_AS_OPEN, | |
108 | RUN_AS_UNLINK, | |
109 | RUN_AS_RMDIR_RECURSIVE, | |
110 | RUN_AS_MKDIR_RECURSIVE, | |
241e0a5a | 111 | RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET, |
0ef03255 | 112 | RUN_AS_EXTRACT_SDT_PROBE_OFFSETS, |
7567352f MD |
113 | }; |
114 | ||
115 | struct run_as_data { | |
116 | enum run_as_cmd cmd; | |
fe9f7760 | 117 | int fd; |
7567352f MD |
118 | union { |
119 | struct run_as_mkdir_data mkdir; | |
120 | struct run_as_open_data open; | |
121 | struct run_as_unlink_data unlink; | |
122 | struct run_as_rmdir_recursive_data rmdir_recursive; | |
241e0a5a | 123 | struct run_as_extract_elf_symbol_offset_data extract_elf_symbol_offset; |
0ef03255 | 124 | struct run_as_extract_sdt_probe_offsets_data extract_sdt_probe_offsets; |
7567352f MD |
125 | } u; |
126 | uid_t uid; | |
127 | gid_t gid; | |
4628484a MD |
128 | }; |
129 | ||
fe9f7760 FD |
130 | /* |
131 | * The run_as_ret structure holds the returned value and status of the command. | |
132 | * | |
133 | * The `u` union field holds the return value of the command; in most cases it | |
134 | * represents the success or the failure of the command. In more complex | |
135 | * commands, it holds a computed value. | |
136 | * | |
137 | * The _errno field is the errno recorded after the execution of the command. | |
138 | * | |
139 | * The _error fields is used the signify that return status of the command. For | |
140 | * simple commands returning `int` the _error field will be the same as the | |
141 | * ret_int field. In complex commands, it signify the success or failure of the | |
142 | * command. | |
143 | * | |
144 | */ | |
df5b86c8 | 145 | struct run_as_ret { |
fe9f7760 FD |
146 | int fd; |
147 | union { | |
148 | struct run_as_mkdir_ret mkdir; | |
149 | struct run_as_open_ret open; | |
150 | struct run_as_unlink_ret unlink; | |
151 | struct run_as_rmdir_recursive_ret rmdir_recursive; | |
241e0a5a | 152 | struct run_as_extract_elf_symbol_offset_ret extract_elf_symbol_offset; |
0ef03255 | 153 | struct run_as_extract_sdt_probe_offsets_ret extract_sdt_probe_offsets; |
fe9f7760 | 154 | } u; |
df5b86c8 | 155 | int _errno; |
fe9f7760 | 156 | bool _error; |
df5b86c8 MD |
157 | }; |
158 | ||
7567352f MD |
159 | struct run_as_worker { |
160 | pid_t pid; /* Worker PID. */ | |
161 | int sockpair[2]; | |
162 | char *procname; | |
163 | }; | |
164 | ||
165 | /* Single global worker per process (for now). */ | |
166 | static struct run_as_worker *global_worker; | |
167 | /* Lock protecting the worker. */ | |
168 | static pthread_mutex_t worker_lock = PTHREAD_MUTEX_INITIALIZER; | |
169 | ||
8f0044bf MD |
170 | #ifdef VALGRIND |
171 | static | |
172 | int use_clone(void) | |
173 | { | |
174 | return 0; | |
175 | } | |
176 | #else | |
177 | static | |
178 | int use_clone(void) | |
179 | { | |
e8fa9fb0 | 180 | return !lttng_secure_getenv("LTTNG_DEBUG_NOCLONE"); |
8f0044bf MD |
181 | } |
182 | #endif | |
183 | ||
d77dded2 JG |
184 | LTTNG_HIDDEN |
185 | int _utils_mkdir_recursive_unsafe(const char *path, mode_t mode); | |
186 | ||
60b6c79c MD |
187 | /* |
188 | * Create recursively directory using the FULL path. | |
189 | */ | |
190 | static | |
fe9f7760 | 191 | int _mkdir_recursive(struct run_as_data *data, struct run_as_ret *ret_value) |
60b6c79c | 192 | { |
60b6c79c | 193 | const char *path; |
60b6c79c | 194 | mode_t mode; |
60b6c79c | 195 | |
7567352f MD |
196 | path = data->u.mkdir.path; |
197 | mode = data->u.mkdir.mode; | |
60b6c79c | 198 | |
d77dded2 | 199 | /* Safe to call as we have transitioned to the requested uid/gid. */ |
fe9f7760 FD |
200 | ret_value->u.mkdir.ret = _utils_mkdir_recursive_unsafe(path, mode); |
201 | ret_value->_errno = errno; | |
202 | ret_value->_error = (ret_value->u.mkdir.ret) ? true : false; | |
203 | return ret_value->u.mkdir.ret; | |
60b6c79c MD |
204 | } |
205 | ||
206 | static | |
fe9f7760 | 207 | int _mkdir(struct run_as_data *data, struct run_as_ret *ret_value) |
60b6c79c | 208 | { |
fe9f7760 FD |
209 | ret_value->u.mkdir.ret = mkdir(data->u.mkdir.path, data->u.mkdir.mode); |
210 | ret_value->_errno = errno; | |
211 | ret_value->_error = (ret_value->u.mkdir.ret) ? true : false; | |
212 | return ret_value->u.mkdir.ret; | |
7567352f | 213 | } |
7ce36756 | 214 | |
7567352f | 215 | static |
fe9f7760 | 216 | int _open(struct run_as_data *data, struct run_as_ret *ret_value) |
7567352f | 217 | { |
fe9f7760 FD |
218 | ret_value->u.open.ret = open(data->u.open.path, data->u.open.flags, data->u.open.mode); |
219 | ret_value->fd = ret_value->u.open.ret; | |
220 | ret_value->_errno = errno; | |
7da8e14c | 221 | ret_value->_error = ret_value->u.open.ret < 0; |
fe9f7760 | 222 | return ret_value->u.open.ret; |
7567352f MD |
223 | } |
224 | ||
225 | static | |
fe9f7760 | 226 | int _unlink(struct run_as_data *data, struct run_as_ret *ret_value) |
7567352f | 227 | { |
fe9f7760 FD |
228 | ret_value->u.unlink.ret = unlink(data->u.unlink.path); |
229 | ret_value->_errno = errno; | |
230 | ret_value->_error = (ret_value->u.unlink.ret) ? true : false; | |
231 | return ret_value->u.unlink.ret; | |
60b6c79c MD |
232 | } |
233 | ||
234 | static | |
fe9f7760 | 235 | int _rmdir_recursive(struct run_as_data *data, struct run_as_ret *ret_value) |
60b6c79c | 236 | { |
fe9f7760 FD |
237 | ret_value->u.rmdir_recursive.ret = utils_recursive_rmdir(data->u.rmdir_recursive.path); |
238 | ret_value->_errno = errno; | |
239 | ret_value->_error = (ret_value->u.rmdir_recursive.ret) ? true : false; | |
240 | return ret_value->u.rmdir_recursive.ret; | |
7567352f | 241 | } |
df5b86c8 | 242 | |
b1b34226 | 243 | #ifdef HAVE_ELF_H |
241e0a5a FD |
244 | static |
245 | int _extract_elf_symbol_offset(struct run_as_data *data, | |
246 | struct run_as_ret *ret_value) | |
247 | { | |
248 | int ret = 0; | |
249 | ret_value->_error = false; | |
250 | ||
251 | ret = lttng_elf_get_symbol_offset(data->fd, | |
252 | data->u.extract_elf_symbol_offset.function, | |
253 | &ret_value->u.extract_elf_symbol_offset.offset); | |
254 | if (ret) { | |
255 | DBG("Failed to extract ELF function offset"); | |
256 | ret_value->_error = true; | |
257 | } | |
258 | ||
259 | return ret; | |
260 | } | |
261 | ||
0ef03255 FD |
262 | static |
263 | int _extract_sdt_probe_offsets(struct run_as_data *data, | |
264 | struct run_as_ret *ret_value) | |
265 | { | |
266 | int ret = 0; | |
267 | uint64_t *offsets = NULL; | |
268 | uint32_t num_offset; | |
269 | ||
270 | ret_value->_error = false; | |
271 | ||
272 | /* On success, this call allocates the offsets paramater. */ | |
273 | ret = lttng_elf_get_sdt_probe_offsets(data->fd, | |
274 | data->u.extract_sdt_probe_offsets.provider_name, | |
275 | data->u.extract_sdt_probe_offsets.probe_name, | |
276 | &offsets, &num_offset); | |
277 | ||
278 | if (ret) { | |
279 | DBG("Failed to extract SDT probe offsets"); | |
280 | ret_value->_error = true; | |
281 | goto end; | |
282 | } | |
283 | ||
284 | if (num_offset <= 0 || num_offset > LTTNG_KERNEL_MAX_UPROBE_NUM) { | |
285 | DBG("Wrong number of probes."); | |
286 | ret = -1; | |
287 | ret_value->_error = true; | |
288 | goto free_offset; | |
289 | } | |
290 | ||
291 | /* Copy the content of the offsets array to the ret struct. */ | |
292 | memcpy(ret_value->u.extract_sdt_probe_offsets.offsets, | |
293 | offsets, num_offset * sizeof(uint64_t)); | |
294 | ||
295 | ret_value->u.extract_sdt_probe_offsets.num_offset = num_offset; | |
296 | ||
297 | free_offset: | |
298 | free(offsets); | |
299 | end: | |
300 | return ret; | |
301 | } | |
b1b34226 MJ |
302 | #else |
303 | static | |
304 | int _extract_elf_symbol_offset(struct run_as_data *data, | |
305 | struct run_as_ret *ret_value) | |
306 | { | |
307 | ERR("Unimplemented runas command RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET"); | |
308 | return -1; | |
309 | } | |
310 | ||
311 | static | |
312 | int _extract_sdt_probe_offsets(struct run_as_data *data, | |
313 | struct run_as_ret *ret_value) | |
314 | { | |
315 | ERR("Unimplemented runas command RUN_AS_EXTRACT_SDT_PROBE_OFFSETS"); | |
316 | return -1; | |
317 | } | |
318 | #endif | |
241e0a5a | 319 | |
7567352f MD |
320 | static |
321 | run_as_fct run_as_enum_to_fct(enum run_as_cmd cmd) | |
322 | { | |
323 | switch (cmd) { | |
324 | case RUN_AS_MKDIR: | |
325 | return _mkdir; | |
326 | case RUN_AS_OPEN: | |
327 | return _open; | |
328 | case RUN_AS_UNLINK: | |
329 | return _unlink; | |
330 | case RUN_AS_RMDIR_RECURSIVE: | |
331 | return _rmdir_recursive; | |
332 | case RUN_AS_MKDIR_RECURSIVE: | |
333 | return _mkdir_recursive; | |
241e0a5a FD |
334 | case RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET: |
335 | return _extract_elf_symbol_offset; | |
0ef03255 FD |
336 | case RUN_AS_EXTRACT_SDT_PROBE_OFFSETS: |
337 | return _extract_sdt_probe_offsets; | |
7567352f | 338 | default: |
62a7b8ed | 339 | ERR("Unknown command %d", (int) cmd); |
7567352f MD |
340 | return NULL; |
341 | } | |
60b6c79c MD |
342 | } |
343 | ||
4628484a | 344 | static |
fe9f7760 | 345 | int do_send_fd(int sock, int fd) |
4628484a | 346 | { |
7567352f | 347 | ssize_t len; |
4628484a | 348 | |
7567352f | 349 | if (fd < 0) { |
ca9eb994 JG |
350 | ERR("Attempt to send invalid file descriptor to master (fd = %i)", fd); |
351 | /* Return 0 as this is not a fatal error. */ | |
7567352f MD |
352 | return 0; |
353 | } | |
fe9f7760 FD |
354 | |
355 | len = lttcomm_send_fds_unix_sock(sock, &fd, 1); | |
7567352f MD |
356 | if (len < 0) { |
357 | PERROR("lttcomm_send_fds_unix_sock"); | |
358 | return -1; | |
359 | } | |
7567352f | 360 | return 0; |
4628484a MD |
361 | } |
362 | ||
363 | static | |
fe9f7760 | 364 | int do_recv_fd(int sock, int *fd) |
4628484a | 365 | { |
7567352f | 366 | ssize_t len; |
4628484a | 367 | |
fe9f7760 FD |
368 | len = lttcomm_recv_fds_unix_sock(sock, fd, 1); |
369 | ||
da9ee832 JG |
370 | if (!len) { |
371 | return -1; | |
372 | } else if (len < 0) { | |
7567352f MD |
373 | PERROR("lttcomm_recv_fds_unix_sock"); |
374 | return -1; | |
375 | } | |
ca9eb994 JG |
376 | if (*fd < 0) { |
377 | ERR("Invalid file descriptor received from worker (fd = %i)", *fd); | |
378 | /* Return 0 as this is not a fatal error. */ | |
379 | return 0; | |
380 | } | |
381 | ||
7567352f | 382 | return 0; |
4628484a MD |
383 | } |
384 | ||
fe9f7760 FD |
385 | static |
386 | int send_fd_to_worker(struct run_as_worker *worker, enum run_as_cmd cmd, int fd) | |
387 | { | |
388 | int ret = 0; | |
389 | ||
390 | switch (cmd) { | |
241e0a5a | 391 | case RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET: |
0ef03255 | 392 | case RUN_AS_EXTRACT_SDT_PROBE_OFFSETS: |
241e0a5a | 393 | break; |
fe9f7760 FD |
394 | default: |
395 | return 0; | |
396 | } | |
397 | ||
ca9eb994 JG |
398 | if (fd < 0) { |
399 | ERR("Refusing to send invalid fd to worker (fd = %i)", fd); | |
400 | return -1; | |
401 | } | |
402 | ||
fe9f7760 FD |
403 | ret = do_send_fd(worker->sockpair[0], fd); |
404 | if (ret < 0) { | |
405 | PERROR("do_send_fd"); | |
406 | ret = -1; | |
407 | } | |
408 | ||
409 | return ret; | |
410 | } | |
411 | ||
412 | static | |
413 | int send_fd_to_master(struct run_as_worker *worker, enum run_as_cmd cmd, int fd) | |
414 | { | |
415 | int ret = 0, ret_close = 0; | |
416 | ||
417 | switch (cmd) { | |
418 | case RUN_AS_OPEN: | |
419 | break; | |
420 | default: | |
421 | return 0; | |
422 | } | |
423 | ||
ca9eb994 JG |
424 | if (fd < 0) { |
425 | DBG("Not sending file descriptor to master as it is invalid (fd = %i)", fd); | |
426 | return 0; | |
427 | } | |
fe9f7760 FD |
428 | ret = do_send_fd(worker->sockpair[1], fd); |
429 | if (ret < 0) { | |
430 | PERROR("do_send_fd error"); | |
431 | ret = -1; | |
432 | } | |
433 | ||
434 | ret_close = close(fd); | |
435 | if (ret_close < 0) { | |
436 | PERROR("close"); | |
437 | } | |
ca9eb994 | 438 | |
fe9f7760 FD |
439 | return ret; |
440 | } | |
441 | ||
442 | static | |
443 | int recv_fd_from_worker(struct run_as_worker *worker, enum run_as_cmd cmd, int *fd) | |
444 | { | |
445 | int ret = 0; | |
446 | ||
447 | switch (cmd) { | |
448 | case RUN_AS_OPEN: | |
449 | break; | |
450 | default: | |
451 | return 0; | |
452 | } | |
453 | ||
454 | ret = do_recv_fd(worker->sockpair[0], fd); | |
455 | if (ret < 0) { | |
456 | PERROR("do_recv_fd error"); | |
457 | ret = -1; | |
458 | } | |
459 | ||
460 | return ret; | |
461 | } | |
462 | ||
463 | static | |
464 | int recv_fd_from_master(struct run_as_worker *worker, enum run_as_cmd cmd, int *fd) | |
465 | { | |
466 | int ret = 0; | |
467 | ||
468 | switch (cmd) { | |
241e0a5a | 469 | case RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET: |
0ef03255 | 470 | case RUN_AS_EXTRACT_SDT_PROBE_OFFSETS: |
241e0a5a | 471 | break; |
fe9f7760 FD |
472 | default: |
473 | return 0; | |
474 | } | |
475 | ||
476 | ret = do_recv_fd(worker->sockpair[1], fd); | |
477 | if (ret < 0) { | |
478 | PERROR("do_recv_fd error"); | |
479 | ret = -1; | |
480 | } | |
481 | ||
482 | return ret; | |
483 | } | |
484 | ||
485 | static | |
486 | int cleanup_received_fd(enum run_as_cmd cmd, int fd) | |
487 | { | |
488 | int ret = 0; | |
489 | ||
490 | switch (cmd) { | |
241e0a5a | 491 | case RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET: |
0ef03255 | 492 | case RUN_AS_EXTRACT_SDT_PROBE_OFFSETS: |
241e0a5a | 493 | break; |
fe9f7760 FD |
494 | default: |
495 | return 0; | |
496 | } | |
497 | ||
9abb7e4a JG |
498 | if (fd < 0) { |
499 | return 0; | |
500 | } | |
fe9f7760 FD |
501 | ret = close(fd); |
502 | if (ret < 0) { | |
503 | PERROR("close error"); | |
504 | ret = -1; | |
505 | } | |
506 | ||
507 | return ret; | |
508 | } | |
0ef03255 | 509 | |
7567352f MD |
510 | /* |
511 | * Return < 0 on error, 0 if OK, 1 on hangup. | |
512 | */ | |
c2b75c49 | 513 | static |
7567352f | 514 | int handle_one_cmd(struct run_as_worker *worker) |
c2b75c49 | 515 | { |
7567352f MD |
516 | int ret = 0; |
517 | struct run_as_data data; | |
518 | ssize_t readlen, writelen; | |
df5b86c8 | 519 | struct run_as_ret sendret; |
7567352f MD |
520 | run_as_fct cmd; |
521 | uid_t prev_euid; | |
522 | ||
ee5fcf1d JG |
523 | memset(&sendret, 0, sizeof(sendret)); |
524 | sendret.fd = -1; | |
525 | ||
fe9f7760 FD |
526 | /* |
527 | * Stage 1: Receive run_as_data struct from the master. | |
528 | * The structure contains the command type and all the parameters needed for | |
529 | * its execution | |
530 | */ | |
7567352f MD |
531 | readlen = lttcomm_recv_unix_sock(worker->sockpair[1], &data, |
532 | sizeof(data)); | |
533 | if (readlen == 0) { | |
534 | /* hang up */ | |
535 | ret = 1; | |
536 | goto end; | |
537 | } | |
538 | if (readlen < sizeof(data)) { | |
539 | PERROR("lttcomm_recv_unix_sock error"); | |
540 | ret = -1; | |
541 | goto end; | |
542 | } | |
c2b75c49 | 543 | |
7567352f MD |
544 | cmd = run_as_enum_to_fct(data.cmd); |
545 | if (!cmd) { | |
546 | ret = -1; | |
547 | goto end; | |
548 | } | |
549 | ||
fe9f7760 FD |
550 | /* |
551 | * Stage 2: Receive file descriptor from master. | |
552 | * Some commands need a file descriptor as input so if it's needed we | |
553 | * receive the fd using the Unix socket. | |
554 | */ | |
555 | ret = recv_fd_from_master(worker, data.cmd, &data.fd); | |
556 | if (ret < 0) { | |
557 | PERROR("recv_fd_from_master error"); | |
558 | ret = -1; | |
559 | goto end; | |
560 | } | |
561 | ||
7567352f MD |
562 | prev_euid = getuid(); |
563 | if (data.gid != getegid()) { | |
564 | ret = setegid(data.gid); | |
1576d582 | 565 | if (ret < 0) { |
561f5f2c JG |
566 | sendret._error = true; |
567 | sendret._errno = errno; | |
4c462e79 | 568 | PERROR("setegid"); |
6d73c4ef | 569 | goto write_return; |
1576d582 | 570 | } |
c2b75c49 | 571 | } |
7567352f MD |
572 | if (data.uid != prev_euid) { |
573 | ret = seteuid(data.uid); | |
1576d582 | 574 | if (ret < 0) { |
561f5f2c JG |
575 | sendret._error = true; |
576 | sendret._errno = errno; | |
4c462e79 | 577 | PERROR("seteuid"); |
6d73c4ef | 578 | goto write_return; |
1576d582 | 579 | } |
c2b75c49 | 580 | } |
fe9f7760 | 581 | |
c2b75c49 MD |
582 | /* |
583 | * Also set umask to 0 for mkdir executable bit. | |
584 | */ | |
585 | umask(0); | |
fe9f7760 FD |
586 | |
587 | /* | |
588 | * Stage 3: Execute the command | |
589 | */ | |
590 | ret = (*cmd)(&data, &sendret); | |
591 | if (ret < 0) { | |
592 | DBG("Execution of command returned an error"); | |
593 | } | |
6d73c4ef MD |
594 | |
595 | write_return: | |
fe9f7760 FD |
596 | ret = cleanup_received_fd(data.cmd, data.fd); |
597 | if (ret < 0) { | |
598 | ERR("Error cleaning up FD"); | |
599 | goto end; | |
600 | } | |
601 | ||
602 | /* | |
603 | * Stage 4: Send run_as_ret structure to the master. | |
604 | * This structure contain the return value of the command and the errno. | |
605 | */ | |
7567352f MD |
606 | writelen = lttcomm_send_unix_sock(worker->sockpair[1], &sendret, |
607 | sizeof(sendret)); | |
6cd525e8 | 608 | if (writelen < sizeof(sendret)) { |
7567352f MD |
609 | PERROR("lttcomm_send_unix_sock error"); |
610 | ret = -1; | |
611 | goto end; | |
612 | } | |
fe9f7760 FD |
613 | |
614 | /* | |
615 | * Stage 5: Send file descriptor to the master | |
616 | * Some commands return a file descriptor so if it's needed we pass it back | |
617 | * to the master using the Unix socket. | |
618 | */ | |
619 | ret = send_fd_to_master(worker, data.cmd, sendret.fd); | |
620 | if (ret < 0) { | |
621 | DBG("Sending FD to master returned an error"); | |
7567352f MD |
622 | goto end; |
623 | } | |
fe9f7760 | 624 | |
7567352f MD |
625 | if (seteuid(prev_euid) < 0) { |
626 | PERROR("seteuid"); | |
627 | ret = -1; | |
628 | goto end; | |
629 | } | |
630 | ret = 0; | |
631 | end: | |
632 | return ret; | |
633 | } | |
634 | ||
635 | static | |
636 | int run_as_worker(struct run_as_worker *worker) | |
637 | { | |
638 | int ret; | |
639 | ssize_t writelen; | |
640 | struct run_as_ret sendret; | |
641 | size_t proc_orig_len; | |
642 | ||
643 | /* | |
644 | * Initialize worker. Set a different process cmdline. | |
645 | */ | |
646 | proc_orig_len = strlen(worker->procname); | |
647 | memset(worker->procname, 0, proc_orig_len); | |
648 | strncpy(worker->procname, DEFAULT_RUN_AS_WORKER_NAME, proc_orig_len); | |
649 | ||
e1055edb JG |
650 | ret = lttng_prctl(PR_SET_NAME, |
651 | (unsigned long) DEFAULT_RUN_AS_WORKER_NAME, 0, 0, 0); | |
652 | if (ret && ret != -ENOSYS) { | |
b8090274 JG |
653 | /* Don't fail as this is not essential. */ |
654 | PERROR("prctl PR_SET_NAME"); | |
6cd525e8 | 655 | } |
7567352f | 656 | |
fe9f7760 FD |
657 | memset(&sendret, 0, sizeof(sendret)); |
658 | ||
7567352f MD |
659 | writelen = lttcomm_send_unix_sock(worker->sockpair[1], &sendret, |
660 | sizeof(sendret)); | |
661 | if (writelen < sizeof(sendret)) { | |
662 | PERROR("lttcomm_send_unix_sock error"); | |
663 | ret = EXIT_FAILURE; | |
664 | goto end; | |
665 | } | |
666 | ||
667 | for (;;) { | |
668 | ret = handle_one_cmd(worker); | |
669 | if (ret < 0) { | |
670 | ret = EXIT_FAILURE; | |
671 | goto end; | |
672 | } else if (ret > 0) { | |
673 | break; | |
674 | } else { | |
675 | continue; /* Next command. */ | |
676 | } | |
677 | } | |
678 | ret = EXIT_SUCCESS; | |
679 | end: | |
680 | return ret; | |
c2b75c49 MD |
681 | } |
682 | ||
60b6c79c | 683 | static |
7567352f MD |
684 | int run_as_cmd(struct run_as_worker *worker, |
685 | enum run_as_cmd cmd, | |
686 | struct run_as_data *data, | |
fe9f7760 | 687 | struct run_as_ret *ret_value, |
7567352f | 688 | uid_t uid, gid_t gid) |
60b6c79c | 689 | { |
fe9f7760 | 690 | int ret = 0; |
7567352f | 691 | ssize_t readlen, writelen; |
60b6c79c MD |
692 | |
693 | /* | |
694 | * If we are non-root, we can only deal with our own uid. | |
695 | */ | |
696 | if (geteuid() != 0) { | |
697 | if (uid != geteuid()) { | |
fe9f7760 FD |
698 | ret = -1; |
699 | ret_value->_errno = EPERM; | |
60b6c79c | 700 | ERR("Client (%d)/Server (%d) UID mismatch (and sessiond is not root)", |
08797918 | 701 | (int) uid, (int) geteuid()); |
df5b86c8 | 702 | goto end; |
60b6c79c | 703 | } |
60b6c79c MD |
704 | } |
705 | ||
7567352f MD |
706 | data->cmd = cmd; |
707 | data->uid = uid; | |
708 | data->gid = gid; | |
709 | ||
fe9f7760 FD |
710 | /* |
711 | * Stage 1: Send the run_as_data struct to the worker process | |
712 | */ | |
7567352f MD |
713 | writelen = lttcomm_send_unix_sock(worker->sockpair[0], data, |
714 | sizeof(*data)); | |
715 | if (writelen < sizeof(*data)) { | |
716 | PERROR("Error writing message to run_as"); | |
fe9f7760 FD |
717 | ret = -1; |
718 | ret_value->_errno = EIO; | |
60b6c79c | 719 | goto end; |
c2b75c49 | 720 | } |
7567352f | 721 | |
fe9f7760 FD |
722 | /* |
723 | * Stage 2: Send file descriptor to the worker process if needed | |
724 | */ | |
725 | ret = send_fd_to_worker(worker, data->cmd, data->fd); | |
726 | if (ret) { | |
727 | PERROR("do_send_fd error"); | |
728 | ret = -1; | |
729 | ret_value->_errno = EIO; | |
730 | goto end; | |
731 | } | |
732 | ||
733 | /* | |
734 | * Stage 3: Wait for the execution of the command | |
735 | */ | |
736 | ||
737 | /* | |
738 | * Stage 4: Receive the run_as_ret struct containing the return value and | |
739 | * errno | |
740 | */ | |
741 | readlen = lttcomm_recv_unix_sock(worker->sockpair[0], ret_value, | |
742 | sizeof(*ret_value)); | |
da9ee832 JG |
743 | if (!readlen) { |
744 | ERR("Run-as worker has hung-up during run_as_cmd"); | |
fe9f7760 FD |
745 | ret = -1; |
746 | ret_value->_errno = EIO; | |
da9ee832 | 747 | goto end; |
fe9f7760 | 748 | } else if (readlen < sizeof(*ret_value)) { |
7567352f | 749 | PERROR("Error reading response from run_as"); |
fe9f7760 FD |
750 | ret = -1; |
751 | ret_value->_errno = errno; | |
033b58a7 | 752 | goto end; |
6cd525e8 | 753 | } |
fe9f7760 | 754 | |
ca9eb994 JG |
755 | if (ret_value->_error) { |
756 | /* Skip stage 5 on error as there will be no fd to receive. */ | |
757 | goto end; | |
758 | } | |
759 | ||
fe9f7760 FD |
760 | /* |
761 | * Stage 5: Receive file descriptor if needed | |
762 | */ | |
763 | ret = recv_fd_from_worker(worker, data->cmd, &ret_value->fd); | |
764 | if (ret < 0) { | |
765 | ERR("Error receiving fd"); | |
766 | ret = -1; | |
767 | ret_value->_errno = EIO; | |
4c462e79 | 768 | } |
7567352f | 769 | |
60b6c79c | 770 | end: |
fe9f7760 | 771 | return ret; |
60b6c79c MD |
772 | } |
773 | ||
2d85a600 | 774 | /* |
7567352f | 775 | * This is for debugging ONLY and should not be considered secure. |
2d85a600 MD |
776 | */ |
777 | static | |
fe9f7760 FD |
778 | int run_as_noworker(enum run_as_cmd cmd, |
779 | struct run_as_data *data, struct run_as_ret *ret_value, | |
780 | uid_t uid, gid_t gid) | |
2d85a600 | 781 | { |
df5b86c8 | 782 | int ret, saved_errno; |
5b73926f | 783 | mode_t old_mask; |
7567352f | 784 | run_as_fct fct; |
5b73926f | 785 | |
7567352f MD |
786 | fct = run_as_enum_to_fct(cmd); |
787 | if (!fct) { | |
788 | errno = -ENOSYS; | |
789 | ret = -1; | |
790 | goto end; | |
791 | } | |
5b73926f | 792 | old_mask = umask(0); |
fe9f7760 FD |
793 | ret = fct(data, ret_value); |
794 | saved_errno = ret_value->_errno; | |
5b73926f | 795 | umask(old_mask); |
df5b86c8 | 796 | errno = saved_errno; |
7567352f | 797 | end: |
5b73926f | 798 | return ret; |
2d85a600 MD |
799 | } |
800 | ||
8fec83ea JG |
801 | static |
802 | int reset_sighandler(void) | |
803 | { | |
804 | int sig; | |
805 | ||
806 | DBG("Resetting run_as worker signal handlers to default"); | |
807 | for (sig = 1; sig <= 31; sig++) { | |
808 | (void) signal(sig, SIG_DFL); | |
809 | } | |
810 | return 0; | |
811 | } | |
812 | ||
813 | static | |
814 | void worker_sighandler(int sig) | |
815 | { | |
816 | const char *signame; | |
817 | ||
818 | /* | |
819 | * The worker will inherit its parent's signals since they are part of | |
820 | * the same process group. However, in the case of SIGINT and SIGTERM, | |
821 | * we want to give the worker a chance to teardown gracefully when its | |
822 | * parent closes the command socket. | |
823 | */ | |
824 | switch (sig) { | |
825 | case SIGINT: | |
826 | signame = "SIGINT"; | |
827 | break; | |
828 | case SIGTERM: | |
829 | signame = "SIGTERM"; | |
830 | break; | |
831 | default: | |
832 | signame = NULL; | |
833 | } | |
834 | ||
835 | if (signame) { | |
836 | DBG("run_as worker received signal %s", signame); | |
837 | } else { | |
838 | DBG("run_as_worker received signal %d", sig); | |
839 | } | |
840 | } | |
841 | ||
842 | static | |
843 | int set_worker_sighandlers(void) | |
844 | { | |
845 | int ret = 0; | |
846 | sigset_t sigset; | |
847 | struct sigaction sa; | |
848 | ||
849 | if ((ret = sigemptyset(&sigset)) < 0) { | |
850 | PERROR("sigemptyset"); | |
851 | goto end; | |
852 | } | |
853 | ||
854 | sa.sa_handler = worker_sighandler; | |
855 | sa.sa_mask = sigset; | |
856 | sa.sa_flags = 0; | |
857 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { | |
858 | PERROR("sigaction SIGINT"); | |
859 | goto end; | |
860 | } | |
861 | ||
862 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
863 | PERROR("sigaction SIGTERM"); | |
864 | goto end; | |
865 | } | |
866 | ||
867 | DBG("run_as signal handler set for SIGTERM and SIGINT"); | |
868 | end: | |
869 | return ret; | |
870 | } | |
871 | ||
872 | static | |
873 | int run_as_create_worker_no_lock(const char *procname) | |
874 | { | |
875 | pid_t pid; | |
876 | int i, ret = 0; | |
877 | ssize_t readlen; | |
878 | struct run_as_ret recvret; | |
879 | struct run_as_worker *worker; | |
880 | ||
881 | assert(!global_worker); | |
882 | if (!use_clone()) { | |
883 | /* | |
884 | * Don't initialize a worker, all run_as tasks will be performed | |
885 | * in the current process. | |
886 | */ | |
887 | ret = 0; | |
888 | goto end; | |
889 | } | |
890 | worker = zmalloc(sizeof(*worker)); | |
891 | if (!worker) { | |
892 | ret = -ENOMEM; | |
893 | goto end; | |
894 | } | |
895 | worker->procname = strdup(procname); | |
896 | if (!worker->procname) { | |
897 | ret = -ENOMEM; | |
8c96eded | 898 | goto error_procname_alloc; |
8fec83ea JG |
899 | } |
900 | /* Create unix socket. */ | |
901 | if (lttcomm_create_anon_unix_socketpair(worker->sockpair) < 0) { | |
902 | ret = -1; | |
903 | goto error_sock; | |
904 | } | |
905 | ||
906 | /* Fork worker. */ | |
907 | pid = fork(); | |
908 | if (pid < 0) { | |
909 | PERROR("fork"); | |
910 | ret = -1; | |
911 | goto error_fork; | |
912 | } else if (pid == 0) { | |
913 | /* Child */ | |
914 | ||
915 | reset_sighandler(); | |
916 | ||
917 | set_worker_sighandlers(); | |
918 | ||
919 | /* Just close, no shutdown. */ | |
920 | if (close(worker->sockpair[0])) { | |
921 | PERROR("close"); | |
922 | exit(EXIT_FAILURE); | |
923 | } | |
924 | ||
925 | /* | |
926 | * Close all FDs aside from STDIN, STDOUT, STDERR and sockpair[1] | |
927 | * Sockpair[1] is used as a control channel with the master | |
928 | */ | |
929 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
930 | if (i != worker->sockpair[1]) { | |
931 | (void) close(i); | |
932 | } | |
933 | } | |
934 | ||
935 | worker->sockpair[0] = -1; | |
936 | ret = run_as_worker(worker); | |
937 | if (lttcomm_close_unix_sock(worker->sockpair[1])) { | |
938 | PERROR("close"); | |
939 | ret = -1; | |
940 | } | |
941 | worker->sockpair[1] = -1; | |
340cf672 JG |
942 | free(worker->procname); |
943 | free(worker); | |
8fec83ea JG |
944 | LOG(ret ? PRINT_ERR : PRINT_DBG, "run_as worker exiting (ret = %d)", ret); |
945 | exit(ret ? EXIT_FAILURE : EXIT_SUCCESS); | |
946 | } else { | |
947 | /* Parent */ | |
948 | ||
949 | /* Just close, no shutdown. */ | |
950 | if (close(worker->sockpair[1])) { | |
951 | PERROR("close"); | |
952 | ret = -1; | |
953 | goto error_fork; | |
954 | } | |
955 | worker->sockpair[1] = -1; | |
956 | worker->pid = pid; | |
957 | /* Wait for worker to become ready. */ | |
958 | readlen = lttcomm_recv_unix_sock(worker->sockpair[0], | |
959 | &recvret, sizeof(recvret)); | |
960 | if (readlen < sizeof(recvret)) { | |
961 | ERR("readlen: %zd", readlen); | |
962 | PERROR("Error reading response from run_as at creation"); | |
963 | ret = -1; | |
964 | goto error_fork; | |
965 | } | |
966 | global_worker = worker; | |
967 | } | |
968 | end: | |
969 | return ret; | |
970 | ||
971 | /* Error handling. */ | |
972 | error_fork: | |
973 | for (i = 0; i < 2; i++) { | |
974 | if (worker->sockpair[i] < 0) { | |
975 | continue; | |
976 | } | |
977 | if (lttcomm_close_unix_sock(worker->sockpair[i])) { | |
978 | PERROR("close"); | |
979 | } | |
980 | worker->sockpair[i] = -1; | |
981 | } | |
982 | error_sock: | |
8c96eded FD |
983 | free(worker->procname); |
984 | error_procname_alloc: | |
8fec83ea JG |
985 | free(worker); |
986 | return ret; | |
987 | } | |
988 | ||
2d85a600 | 989 | static |
fe9f7760 | 990 | int run_as_restart_worker(struct run_as_worker *worker) |
2d85a600 | 991 | { |
fe9f7760 FD |
992 | int ret = 0; |
993 | char *procname = NULL; | |
994 | ||
995 | procname = worker->procname; | |
996 | ||
997 | /* Close socket to run_as worker process and clean up the zombie process */ | |
998 | run_as_destroy_worker(); | |
999 | ||
1000 | /* Create a new run_as worker process*/ | |
8fec83ea | 1001 | ret = run_as_create_worker_no_lock(procname); |
fe9f7760 FD |
1002 | if (ret < 0 ) { |
1003 | ERR("Restarting the worker process failed"); | |
1004 | ret = -1; | |
1005 | goto err; | |
1006 | } | |
1007 | err: | |
1008 | return ret; | |
1009 | } | |
1010 | ||
1011 | static | |
1012 | int run_as(enum run_as_cmd cmd, struct run_as_data *data, | |
1013 | struct run_as_ret *ret_value, uid_t uid, gid_t gid) | |
1014 | { | |
1015 | int ret, saved_errno; | |
7567352f | 1016 | |
8fec83ea | 1017 | pthread_mutex_lock(&worker_lock); |
749b7a0c | 1018 | if (use_clone()) { |
7567352f | 1019 | DBG("Using run_as worker"); |
8fec83ea | 1020 | |
749b7a0c | 1021 | assert(global_worker); |
749b7a0c | 1022 | |
fe9f7760 FD |
1023 | ret = run_as_cmd(global_worker, cmd, data, ret_value, uid, gid); |
1024 | saved_errno = ret_value->_errno; | |
1025 | ||
fe9f7760 FD |
1026 | /* |
1027 | * If the worker thread crashed the errno is set to EIO. we log | |
1028 | * the error and start a new worker process. | |
1029 | */ | |
1030 | if (ret == -1 && saved_errno == EIO) { | |
1031 | DBG("Socket closed unexpectedly... " | |
1032 | "Restarting the worker process"); | |
1033 | ret = run_as_restart_worker(global_worker); | |
fe9f7760 FD |
1034 | if (ret == -1) { |
1035 | ERR("Failed to restart worker process."); | |
1036 | goto err; | |
1037 | } | |
1038 | } | |
2d85a600 | 1039 | } else { |
7567352f | 1040 | DBG("Using run_as without worker"); |
fe9f7760 | 1041 | ret = run_as_noworker(cmd, data, ret_value, uid, gid); |
2d85a600 | 1042 | } |
fe9f7760 | 1043 | err: |
8fec83ea | 1044 | pthread_mutex_unlock(&worker_lock); |
7567352f | 1045 | return ret; |
2d85a600 MD |
1046 | } |
1047 | ||
90e535ef | 1048 | LTTNG_HIDDEN |
e11d277b | 1049 | int run_as_mkdir_recursive(const char *path, mode_t mode, uid_t uid, gid_t gid) |
60b6c79c | 1050 | { |
7567352f | 1051 | struct run_as_data data; |
fe9f7760 | 1052 | struct run_as_ret ret; |
60b6c79c | 1053 | |
8446e5eb | 1054 | memset(&data, 0, sizeof(data)); |
fe9f7760 | 1055 | memset(&ret, 0, sizeof(ret)); |
60b6c79c | 1056 | DBG3("mkdir() recursive %s with mode %d for uid %d and gid %d", |
08797918 | 1057 | path, (int) mode, (int) uid, (int) gid); |
7567352f MD |
1058 | strncpy(data.u.mkdir.path, path, PATH_MAX - 1); |
1059 | data.u.mkdir.path[PATH_MAX - 1] = '\0'; | |
1060 | data.u.mkdir.mode = mode; | |
fe9f7760 FD |
1061 | |
1062 | run_as(RUN_AS_MKDIR_RECURSIVE, &data, &ret, uid, gid); | |
1063 | errno = ret._errno; | |
1064 | return ret.u.mkdir.ret; | |
60b6c79c MD |
1065 | } |
1066 | ||
90e535ef | 1067 | LTTNG_HIDDEN |
e11d277b | 1068 | int run_as_mkdir(const char *path, mode_t mode, uid_t uid, gid_t gid) |
60b6c79c | 1069 | { |
7567352f | 1070 | struct run_as_data data; |
fe9f7760 | 1071 | struct run_as_ret ret; |
60b6c79c | 1072 | |
8446e5eb | 1073 | memset(&data, 0, sizeof(data)); |
fe9f7760 FD |
1074 | memset(&ret, 0, sizeof(ret)); |
1075 | ||
60b6c79c | 1076 | DBG3("mkdir() %s with mode %d for uid %d and gid %d", |
08797918 | 1077 | path, (int) mode, (int) uid, (int) gid); |
7567352f MD |
1078 | strncpy(data.u.mkdir.path, path, PATH_MAX - 1); |
1079 | data.u.mkdir.path[PATH_MAX - 1] = '\0'; | |
1080 | data.u.mkdir.mode = mode; | |
fe9f7760 FD |
1081 | run_as(RUN_AS_MKDIR, &data, &ret, uid, gid); |
1082 | errno = ret._errno; | |
1083 | return ret.u.mkdir.ret; | |
60b6c79c MD |
1084 | } |
1085 | ||
90e535ef | 1086 | LTTNG_HIDDEN |
e11d277b | 1087 | int run_as_open(const char *path, int flags, mode_t mode, uid_t uid, gid_t gid) |
60b6c79c | 1088 | { |
7567352f | 1089 | struct run_as_data data; |
fe9f7760 | 1090 | struct run_as_ret ret; |
c2b75c49 | 1091 | |
8446e5eb | 1092 | memset(&data, 0, sizeof(data)); |
fe9f7760 FD |
1093 | memset(&ret, 0, sizeof(ret)); |
1094 | ||
47fb7563 | 1095 | DBG3("open() %s with flags %X mode %d for uid %d and gid %d", |
08797918 | 1096 | path, flags, (int) mode, (int) uid, (int) gid); |
7567352f MD |
1097 | strncpy(data.u.open.path, path, PATH_MAX - 1); |
1098 | data.u.open.path[PATH_MAX - 1] = '\0'; | |
1099 | data.u.open.flags = flags; | |
1100 | data.u.open.mode = mode; | |
fe9f7760 FD |
1101 | run_as(RUN_AS_OPEN, &data, &ret, uid, gid); |
1102 | errno = ret._errno; | |
1103 | ret.u.open.ret = ret.fd; | |
1104 | return ret.u.open.ret; | |
60b6c79c | 1105 | } |
4628484a MD |
1106 | |
1107 | LTTNG_HIDDEN | |
1108 | int run_as_unlink(const char *path, uid_t uid, gid_t gid) | |
1109 | { | |
7567352f | 1110 | struct run_as_data data; |
fe9f7760 | 1111 | struct run_as_ret ret; |
4628484a | 1112 | |
8446e5eb | 1113 | memset(&data, 0, sizeof(data)); |
fe9f7760 FD |
1114 | memset(&ret, 0, sizeof(ret)); |
1115 | ||
4628484a | 1116 | DBG3("unlink() %s with for uid %d and gid %d", |
08797918 | 1117 | path, (int) uid, (int) gid); |
7567352f MD |
1118 | strncpy(data.u.unlink.path, path, PATH_MAX - 1); |
1119 | data.u.unlink.path[PATH_MAX - 1] = '\0'; | |
fe9f7760 FD |
1120 | run_as(RUN_AS_UNLINK, &data, &ret, uid, gid); |
1121 | errno = ret._errno; | |
1122 | return ret.u.unlink.ret; | |
4628484a MD |
1123 | } |
1124 | ||
1125 | LTTNG_HIDDEN | |
7567352f | 1126 | int run_as_rmdir_recursive(const char *path, uid_t uid, gid_t gid) |
4628484a | 1127 | { |
7567352f | 1128 | struct run_as_data data; |
fe9f7760 FD |
1129 | struct run_as_ret ret; |
1130 | ||
1131 | memset(&data, 0, sizeof(data)); | |
1132 | memset(&ret, 0, sizeof(ret)); | |
4628484a | 1133 | |
7567352f | 1134 | DBG3("rmdir_recursive() %s with for uid %d and gid %d", |
08797918 | 1135 | path, (int) uid, (int) gid); |
7567352f MD |
1136 | strncpy(data.u.rmdir_recursive.path, path, PATH_MAX - 1); |
1137 | data.u.rmdir_recursive.path[PATH_MAX - 1] = '\0'; | |
fe9f7760 FD |
1138 | run_as(RUN_AS_RMDIR_RECURSIVE, &data, &ret, uid, gid); |
1139 | errno = ret._errno; | |
1140 | return ret.u.rmdir_recursive.ret; | |
7567352f MD |
1141 | } |
1142 | ||
241e0a5a FD |
1143 | LTTNG_HIDDEN |
1144 | int run_as_extract_elf_symbol_offset(int fd, const char* function, | |
1145 | uid_t uid, gid_t gid, uint64_t *offset) | |
1146 | { | |
1147 | struct run_as_data data; | |
1148 | struct run_as_ret ret; | |
1149 | ||
f726677b JG |
1150 | memset(&data, 0, sizeof(data)); |
1151 | memset(&ret, 0, sizeof(ret)); | |
1152 | ||
241e0a5a FD |
1153 | DBG3("extract_elf_symbol_offset() on fd=%d and function=%s " |
1154 | "with for uid %d and gid %d", fd, function, (int) uid, (int) gid); | |
1155 | ||
1156 | data.fd = fd; | |
1157 | ||
1158 | strncpy(data.u.extract_elf_symbol_offset.function, function, LTTNG_SYMBOL_NAME_LEN - 1); | |
1159 | ||
1160 | data.u.extract_elf_symbol_offset.function[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
1161 | ||
1162 | run_as(RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET, &data, &ret, uid, gid); | |
1163 | ||
1164 | errno = ret._errno; | |
1165 | ||
1166 | if (ret._error) { | |
1167 | return -1; | |
1168 | } | |
1169 | ||
1170 | *offset = ret.u.extract_elf_symbol_offset.offset; | |
1171 | return 0; | |
1172 | } | |
1173 | ||
0ef03255 FD |
1174 | LTTNG_HIDDEN |
1175 | int run_as_extract_sdt_probe_offsets(int fd, const char* provider_name, | |
1176 | const char* probe_name, uid_t uid, gid_t gid, | |
1177 | uint64_t **offsets, uint32_t *num_offset) | |
1178 | { | |
1179 | struct run_as_data data; | |
1180 | struct run_as_ret ret; | |
1181 | ||
f726677b JG |
1182 | memset(&data, 0, sizeof(data)); |
1183 | memset(&ret, 0, sizeof(ret)); | |
1184 | ||
0ef03255 FD |
1185 | DBG3("extract_sdt_probe_offsets() on fd=%d, probe_name=%s and " |
1186 | "provider_name=%s with for uid %d and gid %d", fd, probe_name, | |
1187 | provider_name, (int) uid, (int) gid); | |
1188 | ||
1189 | data.fd = fd; | |
1190 | ||
1191 | strncpy(data.u.extract_sdt_probe_offsets.probe_name, probe_name, LTTNG_SYMBOL_NAME_LEN - 1); | |
1192 | strncpy(data.u.extract_sdt_probe_offsets.provider_name, provider_name, LTTNG_SYMBOL_NAME_LEN - 1); | |
1193 | ||
1194 | data.u.extract_sdt_probe_offsets.probe_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
1195 | data.u.extract_sdt_probe_offsets.provider_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
1196 | ||
1197 | run_as(RUN_AS_EXTRACT_SDT_PROBE_OFFSETS, &data, &ret, uid, gid); | |
1198 | ||
1199 | errno = ret._errno; | |
1200 | ||
1201 | if (ret._error) { | |
1202 | return -1; | |
1203 | } | |
1204 | ||
1205 | *num_offset = ret.u.extract_sdt_probe_offsets.num_offset; | |
1206 | ||
1207 | *offsets = zmalloc(*num_offset * sizeof(uint64_t)); | |
1208 | if (!*offsets) { | |
1209 | return -ENOMEM; | |
1210 | } | |
1211 | ||
1212 | memcpy(*offsets, ret.u.extract_sdt_probe_offsets.offsets, *num_offset * sizeof(uint64_t)); | |
1213 | return 0; | |
1214 | } | |
1215 | ||
7567352f | 1216 | LTTNG_HIDDEN |
8fec83ea | 1217 | int run_as_create_worker(const char *procname) |
7567352f | 1218 | { |
8fec83ea | 1219 | int ret; |
7567352f | 1220 | |
749b7a0c | 1221 | pthread_mutex_lock(&worker_lock); |
8fec83ea | 1222 | ret = run_as_create_worker_no_lock(procname); |
749b7a0c | 1223 | pthread_mutex_unlock(&worker_lock); |
7567352f MD |
1224 | return ret; |
1225 | } | |
1226 | ||
1227 | LTTNG_HIDDEN | |
1228 | void run_as_destroy_worker(void) | |
1229 | { | |
1230 | struct run_as_worker *worker = global_worker; | |
7567352f | 1231 | |
978d5d79 | 1232 | DBG("Destroying run_as worker"); |
749b7a0c | 1233 | pthread_mutex_lock(&worker_lock); |
7567352f | 1234 | if (!worker) { |
749b7a0c | 1235 | goto end; |
7567352f MD |
1236 | } |
1237 | /* Close unix socket */ | |
978d5d79 | 1238 | DBG("Closing run_as worker socket"); |
7567352f MD |
1239 | if (lttcomm_close_unix_sock(worker->sockpair[0])) { |
1240 | PERROR("close"); | |
1241 | } | |
1242 | worker->sockpair[0] = -1; | |
1243 | /* Wait for worker. */ | |
f8f66d38 JG |
1244 | for (;;) { |
1245 | int status; | |
1246 | pid_t wait_ret; | |
1247 | ||
1248 | wait_ret = waitpid(worker->pid, &status, 0); | |
1249 | if (wait_ret < 0) { | |
1250 | if (errno == EINTR) { | |
1251 | continue; | |
1252 | } | |
1253 | PERROR("waitpid"); | |
1254 | break; | |
1255 | } | |
1256 | ||
1257 | if (WIFEXITED(status)) { | |
1258 | LOG(WEXITSTATUS(status) == 0 ? PRINT_DBG : PRINT_ERR, | |
1259 | DEFAULT_RUN_AS_WORKER_NAME " terminated with status code %d", | |
1260 | WEXITSTATUS(status)); | |
1261 | break; | |
1262 | } else if (WIFSIGNALED(status)) { | |
1263 | ERR(DEFAULT_RUN_AS_WORKER_NAME " was killed by signal %d", | |
1264 | WTERMSIG(status)); | |
1265 | break; | |
1266 | } | |
7567352f | 1267 | } |
8fec83ea | 1268 | free(worker->procname); |
7567352f MD |
1269 | free(worker); |
1270 | global_worker = NULL; | |
749b7a0c JG |
1271 | end: |
1272 | pthread_mutex_unlock(&worker_lock); | |
4628484a | 1273 | } |