Commit | Line | Data |
---|---|---|
60b6c79c | 1 | /* |
21cf9b6b | 2 | * Copyright (C) 2011 EfficiOS Inc. |
ab5be9fa MJ |
3 | * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
4 | * Copyright (C) 2019 Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
60b6c79c | 5 | * |
c922647d | 6 | * SPDX-License-Identifier: LGPL-2.1-only |
60b6c79c | 7 | * |
60b6c79c MD |
8 | */ |
9 | ||
6c1c0768 | 10 | #define _LGPL_SOURCE |
37ccf8ec FD |
11 | #include <fcntl.h> |
12 | #include <grp.h> | |
60b6c79c | 13 | #include <limits.h> |
37ccf8ec FD |
14 | #include <pwd.h> |
15 | #include <sched.h> | |
16 | #include <signal.h> | |
60b6c79c MD |
17 | #include <stdio.h> |
18 | #include <stdlib.h> | |
19 | #include <string.h> | |
60b6c79c | 20 | #include <sys/stat.h> |
37ccf8ec FD |
21 | #include <sys/types.h> |
22 | #include <sys/wait.h> | |
60b6c79c | 23 | #include <unistd.h> |
60b6c79c | 24 | |
0ae3cfc6 | 25 | #include <common/bytecode/bytecode.h> |
0ef03255 | 26 | #include <common/lttng-kernel.h> |
90e535ef | 27 | #include <common/common.h> |
3fd15a74 | 28 | #include <common/utils.h> |
edf4b93e | 29 | #include <common/compat/errno.h> |
e8fa9fb0 | 30 | #include <common/compat/getenv.h> |
c73f064a | 31 | #include <common/compat/string.h> |
2038dd6c JG |
32 | #include <common/unix.h> |
33 | #include <common/defaults.h> | |
241e0a5a | 34 | #include <common/lttng-elf.h> |
cb8d0d24 | 35 | #include <common/thread.h> |
241e0a5a FD |
36 | |
37 | #include <lttng/constant.h> | |
60b6c79c | 38 | |
c73f064a JR |
39 | #include <common/sessiond-comm/sessiond-comm.h> |
40 | #include <common/filter/filter-ast.h> | |
c73f064a | 41 | |
0857097f DG |
42 | #include "runas.h" |
43 | ||
37ccf8ec FD |
44 | #define GETPW_BUFFER_FALLBACK_SIZE 4096 |
45 | ||
7567352f | 46 | struct run_as_data; |
fe9f7760 FD |
47 | struct run_as_ret; |
48 | typedef int (*run_as_fct)(struct run_as_data *data, struct run_as_ret *ret_value); | |
c2b75c49 | 49 | |
93bed9fe JG |
50 | enum run_as_cmd { |
51 | RUN_AS_MKDIR, | |
52 | RUN_AS_MKDIRAT, | |
53 | RUN_AS_MKDIR_RECURSIVE, | |
54 | RUN_AS_MKDIRAT_RECURSIVE, | |
55 | RUN_AS_OPEN, | |
56 | RUN_AS_OPENAT, | |
57 | RUN_AS_UNLINK, | |
58 | RUN_AS_UNLINKAT, | |
59 | RUN_AS_RMDIR, | |
60 | RUN_AS_RMDIRAT, | |
61 | RUN_AS_RMDIR_RECURSIVE, | |
62 | RUN_AS_RMDIRAT_RECURSIVE, | |
63 | RUN_AS_RENAME, | |
64 | RUN_AS_RENAMEAT, | |
65 | RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET, | |
66 | RUN_AS_EXTRACT_SDT_PROBE_OFFSETS, | |
c73f064a | 67 | RUN_AS_GENERATE_FILTER_BYTECODE, |
60b6c79c MD |
68 | }; |
69 | ||
93bed9fe JG |
70 | struct run_as_mkdir_data { |
71 | int dirfd; | |
72 | char path[LTTNG_PATH_MAX]; | |
73 | mode_t mode; | |
74 | } LTTNG_PACKED; | |
75 | ||
e11d277b | 76 | struct run_as_open_data { |
93bed9fe JG |
77 | int dirfd; |
78 | char path[LTTNG_PATH_MAX]; | |
60b6c79c MD |
79 | int flags; |
80 | mode_t mode; | |
93bed9fe | 81 | } LTTNG_PACKED; |
60b6c79c | 82 | |
4628484a | 83 | struct run_as_unlink_data { |
93bed9fe JG |
84 | int dirfd; |
85 | char path[LTTNG_PATH_MAX]; | |
86 | } LTTNG_PACKED; | |
4628484a | 87 | |
93bed9fe JG |
88 | struct run_as_rmdir_data { |
89 | int dirfd; | |
90 | char path[LTTNG_PATH_MAX]; | |
c73f064a | 91 | int flags; /* enum lttng_directory_handle_rmdir_recursive_flags. */ |
93bed9fe | 92 | } LTTNG_PACKED; |
7567352f | 93 | |
241e0a5a | 94 | struct run_as_extract_elf_symbol_offset_data { |
93bed9fe | 95 | int fd; |
241e0a5a | 96 | char function[LTTNG_SYMBOL_NAME_LEN]; |
93bed9fe | 97 | } LTTNG_PACKED; |
241e0a5a | 98 | |
0ef03255 | 99 | struct run_as_extract_sdt_probe_offsets_data { |
93bed9fe | 100 | int fd; |
0ef03255 FD |
101 | char probe_name[LTTNG_SYMBOL_NAME_LEN]; |
102 | char provider_name[LTTNG_SYMBOL_NAME_LEN]; | |
93bed9fe | 103 | } LTTNG_PACKED; |
0ef03255 | 104 | |
c73f064a JR |
105 | struct run_as_generate_filter_bytecode_data { |
106 | char filter_expression[LTTNG_FILTER_MAX_LEN]; | |
107 | } LTTNG_PACKED; | |
108 | ||
93bed9fe JG |
109 | struct run_as_rename_data { |
110 | /* | |
111 | * [0] = old_dirfd | |
112 | * [1] = new_dirfd | |
113 | */ | |
114 | int dirfds[2]; | |
115 | char old_path[LTTNG_PATH_MAX]; | |
116 | char new_path[LTTNG_PATH_MAX]; | |
117 | } LTTNG_PACKED; | |
fe9f7760 FD |
118 | |
119 | struct run_as_open_ret { | |
93bed9fe JG |
120 | int fd; |
121 | } LTTNG_PACKED; | |
fe9f7760 | 122 | |
241e0a5a FD |
123 | struct run_as_extract_elf_symbol_offset_ret { |
124 | uint64_t offset; | |
93bed9fe | 125 | } LTTNG_PACKED; |
241e0a5a | 126 | |
0ef03255 FD |
127 | struct run_as_extract_sdt_probe_offsets_ret { |
128 | uint32_t num_offset; | |
b8e2fb80 | 129 | uint64_t offsets[LTTNG_KERNEL_ABI_MAX_UPROBE_NUM]; |
93bed9fe | 130 | } LTTNG_PACKED; |
7567352f | 131 | |
c73f064a JR |
132 | struct run_as_generate_filter_bytecode_ret { |
133 | /* A lttng_bytecode_filter struct with 'dynamic' payload. */ | |
134 | char bytecode[LTTNG_FILTER_MAX_LEN]; | |
135 | } LTTNG_PACKED; | |
136 | ||
7567352f MD |
137 | struct run_as_data { |
138 | enum run_as_cmd cmd; | |
139 | union { | |
93bed9fe | 140 | struct run_as_mkdir_data mkdir; |
7567352f MD |
141 | struct run_as_open_data open; |
142 | struct run_as_unlink_data unlink; | |
93bed9fe JG |
143 | struct run_as_rmdir_data rmdir; |
144 | struct run_as_rename_data rename; | |
241e0a5a | 145 | struct run_as_extract_elf_symbol_offset_data extract_elf_symbol_offset; |
0ef03255 | 146 | struct run_as_extract_sdt_probe_offsets_data extract_sdt_probe_offsets; |
c73f064a | 147 | struct run_as_generate_filter_bytecode_data generate_filter_bytecode; |
7567352f MD |
148 | } u; |
149 | uid_t uid; | |
150 | gid_t gid; | |
93bed9fe | 151 | } LTTNG_PACKED; |
4628484a | 152 | |
fe9f7760 FD |
153 | /* |
154 | * The run_as_ret structure holds the returned value and status of the command. | |
155 | * | |
156 | * The `u` union field holds the return value of the command; in most cases it | |
157 | * represents the success or the failure of the command. In more complex | |
158 | * commands, it holds a computed value. | |
159 | * | |
160 | * The _errno field is the errno recorded after the execution of the command. | |
161 | * | |
162 | * The _error fields is used the signify that return status of the command. For | |
163 | * simple commands returning `int` the _error field will be the same as the | |
164 | * ret_int field. In complex commands, it signify the success or failure of the | |
165 | * command. | |
166 | * | |
167 | */ | |
df5b86c8 | 168 | struct run_as_ret { |
fe9f7760 | 169 | union { |
93bed9fe | 170 | int ret; |
fe9f7760 | 171 | struct run_as_open_ret open; |
241e0a5a | 172 | struct run_as_extract_elf_symbol_offset_ret extract_elf_symbol_offset; |
0ef03255 | 173 | struct run_as_extract_sdt_probe_offsets_ret extract_sdt_probe_offsets; |
c73f064a | 174 | struct run_as_generate_filter_bytecode_ret generate_filter_bytecode; |
fe9f7760 | 175 | } u; |
df5b86c8 | 176 | int _errno; |
fe9f7760 | 177 | bool _error; |
93bed9fe JG |
178 | } LTTNG_PACKED; |
179 | ||
180 | #define COMMAND_IN_FDS(data_ptr) ({ \ | |
181 | int *fds = NULL; \ | |
182 | if (command_properties[data_ptr->cmd].in_fds_offset != -1) { \ | |
183 | fds = (int *) ((char *) data_ptr + command_properties[data_ptr->cmd].in_fds_offset); \ | |
184 | } \ | |
185 | fds; \ | |
186 | }) | |
187 | ||
188 | #define COMMAND_OUT_FDS(cmd, ret_ptr) ({ \ | |
189 | int *fds = NULL; \ | |
190 | if (command_properties[cmd].out_fds_offset != -1) { \ | |
191 | fds = (int *) ((char *) ret_ptr + command_properties[cmd].out_fds_offset); \ | |
192 | } \ | |
193 | fds; \ | |
194 | }) | |
195 | ||
196 | #define COMMAND_IN_FD_COUNT(data_ptr) ({ \ | |
197 | command_properties[data_ptr->cmd].in_fd_count; \ | |
198 | }) | |
199 | ||
200 | #define COMMAND_OUT_FD_COUNT(cmd) ({ \ | |
201 | command_properties[cmd].out_fd_count; \ | |
202 | }) | |
203 | ||
204 | #define COMMAND_USE_CWD_FD(data_ptr) command_properties[data_ptr->cmd].use_cwd_fd | |
205 | ||
206 | struct run_as_command_properties { | |
207 | /* Set to -1 when not applicable. */ | |
208 | ptrdiff_t in_fds_offset, out_fds_offset; | |
209 | unsigned int in_fd_count, out_fd_count; | |
210 | bool use_cwd_fd; | |
211 | }; | |
212 | ||
213 | static const struct run_as_command_properties command_properties[] = { | |
a6bc4ca9 | 214 | { |
93bed9fe | 215 | .in_fds_offset = offsetof(struct run_as_data, u.mkdir.dirfd), |
93bed9fe | 216 | .out_fds_offset = -1, |
a6bc4ca9 | 217 | .in_fd_count = 1, |
93bed9fe JG |
218 | .out_fd_count = 0, |
219 | .use_cwd_fd = true, | |
220 | }, | |
a6bc4ca9 | 221 | { |
93bed9fe | 222 | .in_fds_offset = offsetof(struct run_as_data, u.mkdir.dirfd), |
93bed9fe | 223 | .out_fds_offset = -1, |
a6bc4ca9 | 224 | .in_fd_count = 1, |
93bed9fe JG |
225 | .out_fd_count = 0, |
226 | .use_cwd_fd = false, | |
227 | }, | |
a6bc4ca9 | 228 | { |
93bed9fe | 229 | .in_fds_offset = offsetof(struct run_as_data, u.mkdir.dirfd), |
93bed9fe | 230 | .out_fds_offset = -1, |
a6bc4ca9 | 231 | .in_fd_count = 1, |
93bed9fe JG |
232 | .out_fd_count = 0, |
233 | .use_cwd_fd = true, | |
234 | }, | |
a6bc4ca9 | 235 | { |
93bed9fe | 236 | .in_fds_offset = offsetof(struct run_as_data, u.mkdir.dirfd), |
93bed9fe | 237 | .out_fds_offset = -1, |
a6bc4ca9 | 238 | .in_fd_count = 1, |
93bed9fe JG |
239 | .out_fd_count = 0, |
240 | .use_cwd_fd = false, | |
241 | }, | |
a6bc4ca9 | 242 | { |
93bed9fe | 243 | .in_fds_offset = offsetof(struct run_as_data, u.open.dirfd), |
93bed9fe | 244 | .out_fds_offset = offsetof(struct run_as_ret, u.open.fd), |
a6bc4ca9 | 245 | .in_fd_count = 1, |
93bed9fe JG |
246 | .out_fd_count = 1, |
247 | .use_cwd_fd = true, | |
248 | }, | |
a6bc4ca9 | 249 | { |
93bed9fe | 250 | .in_fds_offset = offsetof(struct run_as_data, u.open.dirfd), |
93bed9fe | 251 | .out_fds_offset = offsetof(struct run_as_ret, u.open.fd), |
a6bc4ca9 | 252 | .in_fd_count = 1, |
93bed9fe JG |
253 | .out_fd_count = 1, |
254 | .use_cwd_fd = false, | |
255 | }, | |
a6bc4ca9 | 256 | { |
93bed9fe | 257 | .in_fds_offset = offsetof(struct run_as_data, u.unlink.dirfd), |
93bed9fe | 258 | .out_fds_offset = -1, |
a6bc4ca9 | 259 | .in_fd_count = 1, |
93bed9fe JG |
260 | .out_fd_count = 0, |
261 | .use_cwd_fd = true, | |
262 | }, | |
a6bc4ca9 | 263 | { |
93bed9fe | 264 | .in_fds_offset = offsetof(struct run_as_data, u.unlink.dirfd), |
93bed9fe | 265 | .out_fds_offset = -1, |
a6bc4ca9 | 266 | .in_fd_count = 1, |
93bed9fe JG |
267 | .out_fd_count = 0, |
268 | .use_cwd_fd = false, | |
269 | }, | |
a6bc4ca9 | 270 | { |
93bed9fe | 271 | .in_fds_offset = offsetof(struct run_as_data, u.rmdir.dirfd), |
93bed9fe | 272 | .out_fds_offset = -1, |
a6bc4ca9 | 273 | .in_fd_count = 1, |
93bed9fe JG |
274 | .out_fd_count = 0, |
275 | .use_cwd_fd = true, | |
276 | }, | |
a6bc4ca9 | 277 | { |
93bed9fe | 278 | .in_fds_offset = offsetof(struct run_as_data, u.rmdir.dirfd), |
93bed9fe | 279 | .out_fds_offset = -1, |
a6bc4ca9 | 280 | .in_fd_count = 1, |
93bed9fe JG |
281 | .out_fd_count = 0, |
282 | .use_cwd_fd = false, | |
283 | }, | |
a6bc4ca9 | 284 | { |
93bed9fe | 285 | .in_fds_offset = offsetof(struct run_as_data, u.rmdir.dirfd), |
93bed9fe | 286 | .out_fds_offset = -1, |
a6bc4ca9 | 287 | .in_fd_count = 1, |
93bed9fe JG |
288 | .out_fd_count = 0, |
289 | .use_cwd_fd = true, | |
290 | }, | |
a6bc4ca9 | 291 | { |
93bed9fe | 292 | .in_fds_offset = offsetof(struct run_as_data, u.rmdir.dirfd), |
93bed9fe | 293 | .out_fds_offset = -1, |
a6bc4ca9 | 294 | .in_fd_count = 1, |
93bed9fe JG |
295 | .out_fd_count = 0, |
296 | .use_cwd_fd = false, | |
297 | }, | |
a6bc4ca9 | 298 | { |
93bed9fe | 299 | .in_fds_offset = offsetof(struct run_as_data, u.rename.dirfds), |
93bed9fe | 300 | .out_fds_offset = -1, |
a6bc4ca9 | 301 | .in_fd_count = 2, |
93bed9fe JG |
302 | .out_fd_count = 0, |
303 | .use_cwd_fd = true, | |
304 | }, | |
a6bc4ca9 | 305 | { |
93bed9fe | 306 | .in_fds_offset = offsetof(struct run_as_data, u.rename.dirfds), |
93bed9fe | 307 | .out_fds_offset = -1, |
a6bc4ca9 | 308 | .in_fd_count = 2, |
93bed9fe JG |
309 | .out_fd_count = 0, |
310 | .use_cwd_fd = false, | |
311 | }, | |
a6bc4ca9 | 312 | { |
93bed9fe JG |
313 | .in_fds_offset = offsetof(struct run_as_data, |
314 | u.extract_elf_symbol_offset.fd), | |
93bed9fe | 315 | .out_fds_offset = -1, |
a6bc4ca9 | 316 | .in_fd_count = 1, |
93bed9fe JG |
317 | .out_fd_count = 0, |
318 | .use_cwd_fd = false, | |
319 | }, | |
a6bc4ca9 | 320 | { |
93bed9fe JG |
321 | .in_fds_offset = offsetof(struct run_as_data, |
322 | u.extract_sdt_probe_offsets.fd), | |
93bed9fe | 323 | .out_fds_offset = -1, |
a6bc4ca9 | 324 | .in_fd_count = 1, |
93bed9fe JG |
325 | .out_fd_count = 0, |
326 | .use_cwd_fd = false, | |
327 | }, | |
a6bc4ca9 | 328 | { |
c73f064a | 329 | .in_fds_offset = -1, |
c73f064a | 330 | .out_fds_offset = -1, |
a6bc4ca9 | 331 | .in_fd_count = 0, |
c73f064a JR |
332 | .out_fd_count = 0, |
333 | .use_cwd_fd = false, | |
334 | }, | |
df5b86c8 MD |
335 | }; |
336 | ||
a6bc4ca9 | 337 | struct run_as_worker_data { |
7567352f MD |
338 | pid_t pid; /* Worker PID. */ |
339 | int sockpair[2]; | |
340 | char *procname; | |
341 | }; | |
342 | ||
343 | /* Single global worker per process (for now). */ | |
a6bc4ca9 | 344 | static run_as_worker_data *global_worker; |
7567352f MD |
345 | /* Lock protecting the worker. */ |
346 | static pthread_mutex_t worker_lock = PTHREAD_MUTEX_INITIALIZER; | |
347 | ||
8f0044bf MD |
348 | #ifdef VALGRIND |
349 | static | |
350 | int use_clone(void) | |
351 | { | |
352 | return 0; | |
353 | } | |
354 | #else | |
355 | static | |
356 | int use_clone(void) | |
357 | { | |
e8fa9fb0 | 358 | return !lttng_secure_getenv("LTTNG_DEBUG_NOCLONE"); |
8f0044bf MD |
359 | } |
360 | #endif | |
361 | ||
60b6c79c MD |
362 | /* |
363 | * Create recursively directory using the FULL path. | |
364 | */ | |
365 | static | |
18710679 | 366 | int _mkdirat_recursive(struct run_as_data *data, struct run_as_ret *ret_value) |
60b6c79c | 367 | { |
60b6c79c | 368 | const char *path; |
60b6c79c | 369 | mode_t mode; |
cbf53d23 | 370 | struct lttng_directory_handle *handle; |
60b6c79c | 371 | |
93bed9fe JG |
372 | path = data->u.mkdir.path; |
373 | mode = data->u.mkdir.mode; | |
60b6c79c | 374 | |
cbf53d23 JG |
375 | handle = lttng_directory_handle_create_from_dirfd(data->u.mkdir.dirfd); |
376 | if (!handle) { | |
377 | ret_value->_errno = errno; | |
378 | ret_value->_error = true; | |
379 | ret_value->u.ret = -1; | |
380 | goto end; | |
381 | } | |
87bbb856 | 382 | /* Ownership of dirfd is transferred to the handle. */ |
93bed9fe | 383 | data->u.mkdir.dirfd = -1; |
d77dded2 | 384 | /* Safe to call as we have transitioned to the requested uid/gid. */ |
cbf53d23 JG |
385 | ret_value->u.ret = lttng_directory_handle_create_subdirectory_recursive( |
386 | handle, path, mode); | |
fe9f7760 | 387 | ret_value->_errno = errno; |
93bed9fe | 388 | ret_value->_error = (ret_value->u.ret) ? true : false; |
cbf53d23 JG |
389 | lttng_directory_handle_put(handle); |
390 | end: | |
93bed9fe | 391 | return ret_value->u.ret; |
60b6c79c MD |
392 | } |
393 | ||
394 | static | |
18710679 | 395 | int _mkdirat(struct run_as_data *data, struct run_as_ret *ret_value) |
60b6c79c | 396 | { |
18710679 JG |
397 | const char *path; |
398 | mode_t mode; | |
cbf53d23 | 399 | struct lttng_directory_handle *handle; |
18710679 | 400 | |
93bed9fe JG |
401 | path = data->u.mkdir.path; |
402 | mode = data->u.mkdir.mode; | |
18710679 | 403 | |
cbf53d23 JG |
404 | handle = lttng_directory_handle_create_from_dirfd(data->u.mkdir.dirfd); |
405 | if (!handle) { | |
406 | ret_value->u.ret = -1; | |
407 | ret_value->_errno = errno; | |
408 | ret_value->_error = true; | |
409 | goto end; | |
410 | } | |
87bbb856 | 411 | /* Ownership of dirfd is transferred to the handle. */ |
93bed9fe | 412 | data->u.mkdir.dirfd = -1; |
18710679 | 413 | /* Safe to call as we have transitioned to the requested uid/gid. */ |
cbf53d23 JG |
414 | ret_value->u.ret = lttng_directory_handle_create_subdirectory( |
415 | handle, path, mode); | |
fe9f7760 | 416 | ret_value->_errno = errno; |
93bed9fe | 417 | ret_value->_error = (ret_value->u.ret) ? true : false; |
cbf53d23 JG |
418 | lttng_directory_handle_put(handle); |
419 | end: | |
93bed9fe | 420 | return ret_value->u.ret; |
7567352f | 421 | } |
7ce36756 | 422 | |
7567352f | 423 | static |
fe9f7760 | 424 | int _open(struct run_as_data *data, struct run_as_ret *ret_value) |
7567352f | 425 | { |
93bed9fe | 426 | int fd; |
cbf53d23 | 427 | struct lttng_directory_handle *handle; |
93bed9fe | 428 | |
cbf53d23 JG |
429 | handle = lttng_directory_handle_create_from_dirfd(data->u.open.dirfd); |
430 | if (!handle) { | |
431 | ret_value->_errno = errno; | |
432 | ret_value->_error = true; | |
433 | ret_value->u.ret = -1; | |
434 | goto end; | |
435 | } | |
93bed9fe JG |
436 | /* Ownership of dirfd is transferred to the handle. */ |
437 | data->u.open.dirfd = -1; | |
438 | ||
cbf53d23 | 439 | fd = lttng_directory_handle_open_file(handle, |
93bed9fe JG |
440 | data->u.open.path, data->u.open.flags, |
441 | data->u.open.mode); | |
442 | if (fd < 0) { | |
443 | ret_value->u.ret = -1; | |
444 | ret_value->u.open.fd = -1; | |
445 | } else { | |
446 | ret_value->u.ret = 0; | |
447 | ret_value->u.open.fd = fd; | |
448 | } | |
449 | ||
fe9f7760 | 450 | ret_value->_errno = errno; |
93bed9fe | 451 | ret_value->_error = fd < 0; |
cbf53d23 JG |
452 | lttng_directory_handle_put(handle); |
453 | end: | |
93bed9fe | 454 | return ret_value->u.ret; |
7567352f MD |
455 | } |
456 | ||
457 | static | |
fe9f7760 | 458 | int _unlink(struct run_as_data *data, struct run_as_ret *ret_value) |
7567352f | 459 | { |
cbf53d23 | 460 | struct lttng_directory_handle *handle; |
93bed9fe | 461 | |
cbf53d23 JG |
462 | handle = lttng_directory_handle_create_from_dirfd(data->u.unlink.dirfd); |
463 | if (!handle) { | |
464 | ret_value->u.ret = -1; | |
465 | ret_value->_errno = errno; | |
466 | ret_value->_error = true; | |
467 | goto end; | |
468 | } | |
93bed9fe JG |
469 | |
470 | /* Ownership of dirfd is transferred to the handle. */ | |
471 | data->u.unlink.dirfd = -1; | |
472 | ||
cbf53d23 | 473 | ret_value->u.ret = lttng_directory_handle_unlink_file(handle, |
93bed9fe JG |
474 | data->u.unlink.path); |
475 | ret_value->_errno = errno; | |
476 | ret_value->_error = (ret_value->u.ret) ? true : false; | |
cbf53d23 JG |
477 | lttng_directory_handle_put(handle); |
478 | end: | |
93bed9fe JG |
479 | return ret_value->u.ret; |
480 | } | |
481 | ||
482 | static | |
483 | int _rmdir(struct run_as_data *data, struct run_as_ret *ret_value) | |
484 | { | |
cbf53d23 | 485 | struct lttng_directory_handle *handle; |
93bed9fe | 486 | |
cbf53d23 JG |
487 | handle = lttng_directory_handle_create_from_dirfd(data->u.rmdir.dirfd); |
488 | if (!handle) { | |
489 | ret_value->u.ret = -1; | |
490 | ret_value->_errno = errno; | |
491 | ret_value->_error = true; | |
492 | goto end; | |
493 | } | |
93bed9fe JG |
494 | |
495 | /* Ownership of dirfd is transferred to the handle. */ | |
496 | data->u.rmdir.dirfd = -1; | |
497 | ||
498 | ret_value->u.ret = lttng_directory_handle_remove_subdirectory( | |
cbf53d23 | 499 | handle, data->u.rmdir.path); |
fe9f7760 | 500 | ret_value->_errno = errno; |
93bed9fe | 501 | ret_value->_error = (ret_value->u.ret) ? true : false; |
cbf53d23 JG |
502 | lttng_directory_handle_put(handle); |
503 | end: | |
93bed9fe | 504 | return ret_value->u.ret; |
60b6c79c MD |
505 | } |
506 | ||
507 | static | |
fe9f7760 | 508 | int _rmdir_recursive(struct run_as_data *data, struct run_as_ret *ret_value) |
60b6c79c | 509 | { |
cbf53d23 | 510 | struct lttng_directory_handle *handle; |
93bed9fe | 511 | |
cbf53d23 JG |
512 | handle = lttng_directory_handle_create_from_dirfd(data->u.rmdir.dirfd); |
513 | if (!handle) { | |
514 | ret_value->u.ret = -1; | |
515 | ret_value->_errno = errno; | |
516 | ret_value->_error = true; | |
517 | goto end; | |
518 | } | |
93bed9fe JG |
519 | |
520 | /* Ownership of dirfd is transferred to the handle. */ | |
521 | data->u.rmdir.dirfd = -1; | |
522 | ||
523 | ret_value->u.ret = lttng_directory_handle_remove_subdirectory_recursive( | |
cbf53d23 | 524 | handle, data->u.rmdir.path, data->u.rmdir.flags); |
fe9f7760 | 525 | ret_value->_errno = errno; |
93bed9fe | 526 | ret_value->_error = (ret_value->u.ret) ? true : false; |
cbf53d23 JG |
527 | lttng_directory_handle_put(handle); |
528 | end: | |
93bed9fe JG |
529 | return ret_value->u.ret; |
530 | } | |
531 | ||
532 | static | |
533 | int _rename(struct run_as_data *data, struct run_as_ret *ret_value) | |
534 | { | |
535 | const char *old_path, *new_path; | |
cbf53d23 | 536 | struct lttng_directory_handle *old_handle = NULL, *new_handle = NULL; |
93bed9fe JG |
537 | |
538 | old_path = data->u.rename.old_path; | |
539 | new_path = data->u.rename.new_path; | |
540 | ||
cbf53d23 | 541 | old_handle = lttng_directory_handle_create_from_dirfd( |
93bed9fe | 542 | data->u.rename.dirfds[0]); |
cbf53d23 JG |
543 | if (!old_handle) { |
544 | ret_value->u.ret = -1; | |
545 | goto end; | |
546 | } | |
547 | new_handle = lttng_directory_handle_create_from_dirfd( | |
93bed9fe | 548 | data->u.rename.dirfds[1]); |
cbf53d23 JG |
549 | if (!new_handle) { |
550 | ret_value->u.ret = -1; | |
551 | goto end; | |
552 | } | |
93bed9fe JG |
553 | |
554 | /* Ownership of dirfds are transferred to the handles. */ | |
555 | data->u.rename.dirfds[0] = data->u.rename.dirfds[1] = -1; | |
556 | ||
557 | /* Safe to call as we have transitioned to the requested uid/gid. */ | |
558 | ret_value->u.ret = lttng_directory_handle_rename( | |
cbf53d23 JG |
559 | old_handle, old_path, new_handle, new_path); |
560 | end: | |
561 | lttng_directory_handle_put(old_handle); | |
562 | lttng_directory_handle_put(new_handle); | |
93bed9fe JG |
563 | ret_value->_errno = errno; |
564 | ret_value->_error = (ret_value->u.ret) ? true : false; | |
93bed9fe | 565 | return ret_value->u.ret; |
7567352f | 566 | } |
df5b86c8 | 567 | |
b1b34226 | 568 | #ifdef HAVE_ELF_H |
241e0a5a FD |
569 | static |
570 | int _extract_elf_symbol_offset(struct run_as_data *data, | |
571 | struct run_as_ret *ret_value) | |
572 | { | |
573 | int ret = 0; | |
65eefd4c | 574 | uint64_t offset; |
241e0a5a | 575 | |
93bed9fe JG |
576 | ret_value->_error = false; |
577 | ret = lttng_elf_get_symbol_offset(data->u.extract_elf_symbol_offset.fd, | |
241e0a5a | 578 | data->u.extract_elf_symbol_offset.function, |
65eefd4c | 579 | &offset); |
241e0a5a FD |
580 | if (ret) { |
581 | DBG("Failed to extract ELF function offset"); | |
582 | ret_value->_error = true; | |
583 | } | |
65eefd4c | 584 | ret_value->u.extract_elf_symbol_offset.offset = offset; |
241e0a5a FD |
585 | |
586 | return ret; | |
587 | } | |
588 | ||
0ef03255 FD |
589 | static |
590 | int _extract_sdt_probe_offsets(struct run_as_data *data, | |
591 | struct run_as_ret *ret_value) | |
592 | { | |
593 | int ret = 0; | |
594 | uint64_t *offsets = NULL; | |
595 | uint32_t num_offset; | |
596 | ||
597 | ret_value->_error = false; | |
598 | ||
599 | /* On success, this call allocates the offsets paramater. */ | |
93bed9fe JG |
600 | ret = lttng_elf_get_sdt_probe_offsets( |
601 | data->u.extract_sdt_probe_offsets.fd, | |
0ef03255 FD |
602 | data->u.extract_sdt_probe_offsets.provider_name, |
603 | data->u.extract_sdt_probe_offsets.probe_name, | |
604 | &offsets, &num_offset); | |
605 | ||
606 | if (ret) { | |
607 | DBG("Failed to extract SDT probe offsets"); | |
608 | ret_value->_error = true; | |
609 | goto end; | |
610 | } | |
611 | ||
b8e2fb80 | 612 | if (num_offset <= 0 || num_offset > LTTNG_KERNEL_ABI_MAX_UPROBE_NUM) { |
0ef03255 FD |
613 | DBG("Wrong number of probes."); |
614 | ret = -1; | |
615 | ret_value->_error = true; | |
616 | goto free_offset; | |
617 | } | |
618 | ||
619 | /* Copy the content of the offsets array to the ret struct. */ | |
620 | memcpy(ret_value->u.extract_sdt_probe_offsets.offsets, | |
621 | offsets, num_offset * sizeof(uint64_t)); | |
622 | ||
623 | ret_value->u.extract_sdt_probe_offsets.num_offset = num_offset; | |
624 | ||
625 | free_offset: | |
626 | free(offsets); | |
627 | end: | |
628 | return ret; | |
629 | } | |
b1b34226 MJ |
630 | #else |
631 | static | |
4eac90eb MJ |
632 | int _extract_elf_symbol_offset( |
633 | struct run_as_data *data __attribute__((unused)), | |
634 | struct run_as_ret *ret_value __attribute__((unused))) | |
b1b34226 MJ |
635 | { |
636 | ERR("Unimplemented runas command RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET"); | |
637 | return -1; | |
638 | } | |
639 | ||
640 | static | |
4eac90eb MJ |
641 | int _extract_sdt_probe_offsets( |
642 | struct run_as_data *data __attribute__((unused)), | |
643 | struct run_as_ret *ret_value __attribute__((unused))) | |
b1b34226 MJ |
644 | { |
645 | ERR("Unimplemented runas command RUN_AS_EXTRACT_SDT_PROBE_OFFSETS"); | |
646 | return -1; | |
647 | } | |
648 | #endif | |
241e0a5a | 649 | |
c73f064a JR |
650 | static |
651 | int _generate_filter_bytecode(struct run_as_data *data, | |
652 | struct run_as_ret *ret_value) { | |
653 | int ret = 0; | |
654 | const char *filter_expression = NULL; | |
655 | struct filter_parser_ctx *ctx = NULL; | |
656 | ||
657 | ret_value->_error = false; | |
658 | ||
659 | filter_expression = data->u.generate_filter_bytecode.filter_expression; | |
660 | ||
661 | if (lttng_strnlen(filter_expression, LTTNG_FILTER_MAX_LEN - 1) == LTTNG_FILTER_MAX_LEN - 1) { | |
662 | ret_value->_error = true; | |
663 | ret = -1; | |
664 | goto end; | |
665 | } | |
666 | ||
667 | ret = filter_parser_ctx_create_from_filter_expression(filter_expression, &ctx); | |
668 | if (ret < 0) { | |
669 | ret_value->_error = true; | |
670 | ret = -1; | |
671 | goto end; | |
672 | } | |
673 | ||
674 | DBG("Size of bytecode generated: %u bytes.", | |
675 | bytecode_get_len(&ctx->bytecode->b)); | |
676 | ||
677 | /* Copy the lttng_bytecode_filter object to the return structure. */ | |
678 | memcpy(ret_value->u.generate_filter_bytecode.bytecode, | |
679 | &ctx->bytecode->b, | |
680 | sizeof(ctx->bytecode->b) + | |
681 | bytecode_get_len(&ctx->bytecode->b)); | |
682 | ||
683 | end: | |
684 | if (ctx) { | |
685 | filter_bytecode_free(ctx); | |
686 | filter_ir_free(ctx); | |
687 | filter_parser_ctx_free(ctx); | |
688 | } | |
689 | ||
690 | return ret; | |
691 | } | |
7567352f MD |
692 | static |
693 | run_as_fct run_as_enum_to_fct(enum run_as_cmd cmd) | |
694 | { | |
695 | switch (cmd) { | |
696 | case RUN_AS_MKDIR: | |
18710679 JG |
697 | case RUN_AS_MKDIRAT: |
698 | return _mkdirat; | |
699 | case RUN_AS_MKDIR_RECURSIVE: | |
700 | case RUN_AS_MKDIRAT_RECURSIVE: | |
701 | return _mkdirat_recursive; | |
7567352f | 702 | case RUN_AS_OPEN: |
2912cead | 703 | case RUN_AS_OPENAT: |
7567352f MD |
704 | return _open; |
705 | case RUN_AS_UNLINK: | |
2912cead | 706 | case RUN_AS_UNLINKAT: |
7567352f | 707 | return _unlink; |
93bed9fe JG |
708 | case RUN_AS_RMDIR: |
709 | case RUN_AS_RMDIRAT: | |
710 | return _rmdir; | |
7567352f | 711 | case RUN_AS_RMDIR_RECURSIVE: |
93bed9fe | 712 | case RUN_AS_RMDIRAT_RECURSIVE: |
7567352f | 713 | return _rmdir_recursive; |
93bed9fe JG |
714 | case RUN_AS_RENAME: |
715 | case RUN_AS_RENAMEAT: | |
716 | return _rename; | |
241e0a5a FD |
717 | case RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET: |
718 | return _extract_elf_symbol_offset; | |
0ef03255 FD |
719 | case RUN_AS_EXTRACT_SDT_PROBE_OFFSETS: |
720 | return _extract_sdt_probe_offsets; | |
c73f064a JR |
721 | case RUN_AS_GENERATE_FILTER_BYTECODE: |
722 | return _generate_filter_bytecode; | |
7567352f | 723 | default: |
62a7b8ed | 724 | ERR("Unknown command %d", (int) cmd); |
7567352f MD |
725 | return NULL; |
726 | } | |
60b6c79c MD |
727 | } |
728 | ||
4628484a | 729 | static |
93bed9fe | 730 | int do_send_fds(int sock, const int *fds, unsigned int fd_count) |
4628484a | 731 | { |
7567352f | 732 | ssize_t len; |
93bed9fe JG |
733 | unsigned int i; |
734 | ||
735 | for (i = 0; i < fd_count; i++) { | |
736 | if (fds[i] < 0) { | |
a4c64187 | 737 | DBG("Attempt to send invalid file descriptor (fd = %i)", |
93bed9fe JG |
738 | fds[i]); |
739 | /* Return 0 as this is not a fatal error. */ | |
740 | return 0; | |
741 | } | |
4a76dfd3 | 742 | } |
4628484a | 743 | |
4a76dfd3 | 744 | len = lttcomm_send_fds_unix_sock(sock, fds, fd_count); |
93bed9fe | 745 | return len < 0 ? -1 : 0; |
4628484a MD |
746 | } |
747 | ||
748 | static | |
93bed9fe | 749 | int do_recv_fds(int sock, int *fds, unsigned int fd_count) |
4628484a | 750 | { |
93bed9fe JG |
751 | int ret = 0; |
752 | unsigned int i; | |
7567352f | 753 | ssize_t len; |
4628484a | 754 | |
93bed9fe JG |
755 | len = lttcomm_recv_fds_unix_sock(sock, fds, fd_count); |
756 | if (len == 0) { | |
757 | ret = -1; | |
758 | goto end; | |
da9ee832 | 759 | } else if (len < 0) { |
93bed9fe JG |
760 | PERROR("Failed to receive file descriptors from socket"); |
761 | ret = -1; | |
762 | goto end; | |
ca9eb994 JG |
763 | } |
764 | ||
93bed9fe JG |
765 | for (i = 0; i < fd_count; i++) { |
766 | if (fds[i] < 0) { | |
767 | ERR("Invalid file descriptor received from worker (fd = %i)", fds[i]); | |
768 | /* Return 0 as this is not a fatal error. */ | |
769 | } | |
55cb0d6f | 770 | } |
93bed9fe | 771 | end: |
55cb0d6f | 772 | return ret; |
4628484a MD |
773 | } |
774 | ||
fe9f7760 | 775 | static |
a6bc4ca9 | 776 | int send_fds_to_worker(const run_as_worker_data *worker, |
93bed9fe | 777 | const struct run_as_data *data) |
fe9f7760 FD |
778 | { |
779 | int ret = 0; | |
93bed9fe | 780 | unsigned int i; |
fe9f7760 | 781 | |
93bed9fe JG |
782 | if (COMMAND_USE_CWD_FD(data) || COMMAND_IN_FD_COUNT(data) == 0) { |
783 | goto end; | |
fe9f7760 FD |
784 | } |
785 | ||
93bed9fe JG |
786 | for (i = 0; i < COMMAND_IN_FD_COUNT(data); i++) { |
787 | if (COMMAND_IN_FDS(data)[i] < 0) { | |
788 | ERR("Refusing to send invalid fd to worker (fd = %i)", | |
789 | COMMAND_IN_FDS(data)[i]); | |
790 | ret = -1; | |
791 | goto end; | |
792 | } | |
55cb0d6f | 793 | } |
ca9eb994 | 794 | |
55cb0d6f | 795 | ret = do_send_fds(worker->sockpair[0], COMMAND_IN_FDS(data), |
93bed9fe | 796 | COMMAND_IN_FD_COUNT(data)); |
fe9f7760 | 797 | if (ret < 0) { |
93bed9fe | 798 | PERROR("Failed to send file descriptor to run-as worker"); |
fe9f7760 | 799 | ret = -1; |
93bed9fe | 800 | goto end; |
fe9f7760 | 801 | } |
93bed9fe | 802 | end: |
fe9f7760 FD |
803 | return ret; |
804 | } | |
805 | ||
806 | static | |
a6bc4ca9 | 807 | int send_fds_to_master(run_as_worker_data *worker, enum run_as_cmd cmd, |
93bed9fe | 808 | struct run_as_ret *run_as_ret) |
fe9f7760 | 809 | { |
93bed9fe JG |
810 | int ret = 0; |
811 | unsigned int i; | |
fe9f7760 | 812 | |
93bed9fe JG |
813 | if (COMMAND_OUT_FD_COUNT(cmd) == 0) { |
814 | goto end; | |
fe9f7760 FD |
815 | } |
816 | ||
93bed9fe JG |
817 | ret = do_send_fds(worker->sockpair[1], COMMAND_OUT_FDS(cmd, run_as_ret), |
818 | COMMAND_OUT_FD_COUNT(cmd)); | |
fe9f7760 | 819 | if (ret < 0) { |
93bed9fe JG |
820 | PERROR("Failed to send file descriptor to master process"); |
821 | goto end; | |
fe9f7760 FD |
822 | } |
823 | ||
93bed9fe | 824 | for (i = 0; i < COMMAND_OUT_FD_COUNT(cmd); i++) { |
a4c64187 FD |
825 | int fd = COMMAND_OUT_FDS(cmd, run_as_ret)[i]; |
826 | if (fd >= 0) { | |
827 | int ret_close = close(fd); | |
828 | ||
829 | if (ret_close < 0) { | |
830 | PERROR("Failed to close result file descriptor (fd = %i)", | |
831 | fd); | |
832 | } | |
93bed9fe JG |
833 | } |
834 | } | |
835 | end: | |
fe9f7760 FD |
836 | return ret; |
837 | } | |
838 | ||
839 | static | |
a6bc4ca9 | 840 | int recv_fds_from_worker(const run_as_worker_data *worker, enum run_as_cmd cmd, |
93bed9fe | 841 | struct run_as_ret *run_as_ret) |
fe9f7760 FD |
842 | { |
843 | int ret = 0; | |
844 | ||
93bed9fe JG |
845 | if (COMMAND_OUT_FD_COUNT(cmd) == 0) { |
846 | goto end; | |
fe9f7760 FD |
847 | } |
848 | ||
93bed9fe JG |
849 | ret = do_recv_fds(worker->sockpair[0], COMMAND_OUT_FDS(cmd, run_as_ret), |
850 | COMMAND_OUT_FD_COUNT(cmd)); | |
fe9f7760 | 851 | if (ret < 0) { |
93bed9fe | 852 | PERROR("Failed to receive file descriptor from run-as worker"); |
fe9f7760 FD |
853 | ret = -1; |
854 | } | |
93bed9fe | 855 | end: |
fe9f7760 FD |
856 | return ret; |
857 | } | |
858 | ||
859 | static | |
a6bc4ca9 | 860 | int recv_fds_from_master(run_as_worker_data *worker, struct run_as_data *data) |
fe9f7760 FD |
861 | { |
862 | int ret = 0; | |
863 | ||
93bed9fe JG |
864 | if (COMMAND_USE_CWD_FD(data)) { |
865 | unsigned int i; | |
866 | ||
867 | for (i = 0; i < COMMAND_IN_FD_COUNT(data); i++) { | |
868 | COMMAND_IN_FDS(data)[i] = AT_FDCWD; | |
869 | } | |
870 | goto end; | |
fe9f7760 FD |
871 | } |
872 | ||
c73f064a JR |
873 | if (COMMAND_IN_FD_COUNT(data) == 0) { |
874 | goto end; | |
875 | } | |
876 | ||
93bed9fe JG |
877 | ret = do_recv_fds(worker->sockpair[1], COMMAND_IN_FDS(data), |
878 | COMMAND_IN_FD_COUNT(data)); | |
fe9f7760 | 879 | if (ret < 0) { |
93bed9fe | 880 | PERROR("Failed to receive file descriptors from master process"); |
fe9f7760 FD |
881 | ret = -1; |
882 | } | |
93bed9fe | 883 | end: |
fe9f7760 FD |
884 | return ret; |
885 | } | |
886 | ||
887 | static | |
93bed9fe | 888 | int cleanup_received_fds(struct run_as_data *data) |
fe9f7760 | 889 | { |
93bed9fe | 890 | int ret = 0, i; |
fe9f7760 | 891 | |
93bed9fe JG |
892 | for (i = 0; i < COMMAND_IN_FD_COUNT(data); i++) { |
893 | if (COMMAND_IN_FDS(data)[i] == -1) { | |
894 | continue; | |
895 | } | |
896 | ret = close(COMMAND_IN_FDS(data)[i]); | |
897 | if (ret) { | |
898 | PERROR("Failed to close file descriptor received fd in run-as worker"); | |
899 | goto end; | |
900 | } | |
fe9f7760 | 901 | } |
93bed9fe | 902 | end: |
fe9f7760 FD |
903 | return ret; |
904 | } | |
0ef03255 | 905 | |
37ccf8ec FD |
906 | static int get_user_infos_from_uid( |
907 | uid_t uid, char **username, gid_t *primary_gid) | |
908 | { | |
909 | int ret; | |
910 | char *buf = NULL; | |
222b6734 FD |
911 | long raw_get_pw_buf_size; |
912 | size_t get_pw_buf_size; | |
37ccf8ec FD |
913 | struct passwd pwd; |
914 | struct passwd *result = NULL; | |
915 | ||
916 | /* Fetch the max size for the temporary buffer. */ | |
917 | errno = 0; | |
222b6734 FD |
918 | raw_get_pw_buf_size = sysconf(_SC_GETPW_R_SIZE_MAX); |
919 | if (raw_get_pw_buf_size < 0) { | |
37ccf8ec FD |
920 | if (errno != 0) { |
921 | PERROR("Failed to query _SC_GETPW_R_SIZE_MAX"); | |
922 | goto error; | |
923 | } | |
924 | ||
925 | /* Limit is indeterminate. */ | |
926 | WARN("Failed to query _SC_GETPW_R_SIZE_MAX as it is " | |
927 | "indeterminate; falling back to default buffer size"); | |
222b6734 | 928 | raw_get_pw_buf_size = GETPW_BUFFER_FALLBACK_SIZE; |
37ccf8ec FD |
929 | } |
930 | ||
222b6734 FD |
931 | get_pw_buf_size = (size_t) raw_get_pw_buf_size; |
932 | ||
a6bc4ca9 | 933 | buf = (char *) zmalloc(get_pw_buf_size); |
37ccf8ec FD |
934 | if (buf == NULL) { |
935 | PERROR("Failed to allocate buffer to get password file entries"); | |
936 | goto error; | |
937 | } | |
938 | ||
222b6734 | 939 | ret = getpwuid_r(uid, &pwd, buf, get_pw_buf_size, &result); |
37ccf8ec FD |
940 | if (ret < 0) { |
941 | PERROR("Failed to get user information for user: uid = %d", | |
942 | (int) uid); | |
943 | goto error; | |
944 | } | |
945 | ||
946 | if (result == NULL) { | |
947 | ERR("Failed to find user information in password entries: uid = %d", | |
948 | (int) uid); | |
949 | ret = -1; | |
950 | goto error; | |
951 | } | |
952 | ||
953 | *username = strdup(result->pw_name); | |
954 | if (*username == NULL) { | |
955 | PERROR("Failed to copy user name"); | |
956 | goto error; | |
957 | } | |
958 | ||
959 | *primary_gid = result->pw_gid; | |
960 | ||
961 | end: | |
962 | free(buf); | |
963 | return ret; | |
964 | error: | |
965 | *username = NULL; | |
966 | *primary_gid = -1; | |
967 | ret = -1; | |
968 | goto end; | |
969 | } | |
970 | ||
971 | static int demote_creds( | |
972 | uid_t prev_uid, gid_t prev_gid, uid_t new_uid, gid_t new_gid) | |
973 | { | |
974 | int ret = 0; | |
975 | gid_t primary_gid; | |
976 | char *username = NULL; | |
977 | ||
978 | /* Change the group id. */ | |
979 | if (prev_gid != new_gid) { | |
980 | ret = setegid(new_gid); | |
981 | if (ret < 0) { | |
982 | PERROR("Failed to set effective group id: new_gid = %d", | |
983 | (int) new_gid); | |
984 | goto end; | |
985 | } | |
986 | } | |
987 | ||
988 | /* Change the user id. */ | |
989 | if (prev_uid != new_uid) { | |
990 | ret = get_user_infos_from_uid(new_uid, &username, &primary_gid); | |
991 | if (ret < 0) { | |
992 | goto end; | |
993 | } | |
994 | ||
995 | /* | |
996 | * Initialize the supplementary group access list. | |
997 | * | |
998 | * This is needed to handle cases where the supplementary groups | |
999 | * of the user the process is demoting-to would give it access | |
1000 | * to a given file/folder, but not it's primary group. | |
1001 | * | |
1002 | * e.g | |
1003 | * username: User1 | |
1004 | * Primary Group: User1 | |
1005 | * Secondary group: Disk, Network | |
1006 | * | |
1007 | * mkdir inside the following directory must work since User1 | |
1008 | * is part of the Network group. | |
1009 | * | |
1010 | * drwxrwx--- 2 root Network 4096 Jul 23 17:17 /tmp/my_folder/ | |
1011 | * | |
1012 | * | |
1013 | * The order of the following initgroups and seteuid calls is | |
1014 | * important here; | |
1015 | * Only a root process or one with CAP_SETGID capability can | |
1016 | * call the the initgroups() function. We must initialize the | |
1017 | * supplementary groups before we change the effective | |
1018 | * UID to a less-privileged user. | |
1019 | */ | |
1020 | ret = initgroups(username, primary_gid); | |
1021 | if (ret < 0) { | |
1022 | PERROR("Failed to init the supplementary group access list: " | |
1023 | "username = `%s`, primary gid = %d", username, | |
1024 | (int) primary_gid); | |
1025 | goto end; | |
1026 | } | |
1027 | ||
1028 | ret = seteuid(new_uid); | |
1029 | if (ret < 0) { | |
1030 | PERROR("Failed to set effective user id: new_uid = %d", | |
1031 | (int) new_uid); | |
1032 | goto end; | |
1033 | } | |
1034 | } | |
1035 | end: | |
1036 | free(username); | |
1037 | return ret; | |
1038 | } | |
1039 | ||
1040 | static int promote_creds( | |
1041 | uid_t prev_uid, gid_t prev_gid, uid_t new_uid, gid_t new_gid) | |
1042 | { | |
1043 | int ret = 0; | |
1044 | gid_t primary_gid; | |
1045 | char *username = NULL; | |
1046 | ||
1047 | /* Change the group id. */ | |
1048 | if (prev_gid != new_gid) { | |
1049 | ret = setegid(new_gid); | |
1050 | if (ret < 0) { | |
1051 | PERROR("Failed to set effective group id: new_gid = %d", | |
1052 | (int) new_gid); | |
1053 | goto end; | |
1054 | } | |
1055 | } | |
1056 | ||
1057 | /* Change the user id. */ | |
1058 | if (prev_uid != new_uid) { | |
1059 | ret = get_user_infos_from_uid(new_uid, &username, &primary_gid); | |
1060 | if (ret < 0) { | |
1061 | goto end; | |
1062 | } | |
1063 | ||
1064 | /* | |
1065 | * seteuid call must be done before the initgroups call because | |
1066 | * we need to be privileged (CAP_SETGID) to call initgroups(). | |
1067 | */ | |
1068 | ret = seteuid(new_uid); | |
1069 | if (ret < 0) { | |
1070 | PERROR("Failed to set effective user id: new_uid = %d", | |
1071 | (int) new_uid); | |
1072 | goto end; | |
1073 | } | |
1074 | ||
1075 | /* | |
1076 | * Initialize the supplementary group access list. | |
1077 | * | |
1078 | * There is a possibility the groups we set in the following | |
1079 | * initgroups() call are not exactly the same as the ones we | |
1080 | * had when we originally demoted. This can happen if the | |
1081 | * /etc/group file is modified after the runas process is | |
1082 | * forked. This is very unlikely. | |
1083 | */ | |
1084 | ret = initgroups(username, primary_gid); | |
1085 | if (ret < 0) { | |
1086 | PERROR("Failed to init the supplementary group access " | |
1087 | "list: username = `%s`, primary gid = %d", | |
1088 | username, (int) primary_gid) | |
1089 | goto end; | |
1090 | } | |
1091 | } | |
1092 | end: | |
1093 | free(username); | |
1094 | return ret; | |
1095 | } | |
1096 | ||
7567352f MD |
1097 | /* |
1098 | * Return < 0 on error, 0 if OK, 1 on hangup. | |
1099 | */ | |
c2b75c49 | 1100 | static |
a6bc4ca9 | 1101 | int handle_one_cmd(run_as_worker_data *worker) |
c2b75c49 | 1102 | { |
37ccf8ec | 1103 | int ret = 0, promote_ret; |
55cb0d6f JG |
1104 | struct run_as_data data = {}; |
1105 | ssize_t readlen, writelen; | |
1106 | struct run_as_ret sendret = {}; | |
1107 | run_as_fct cmd; | |
45d6ecaa JG |
1108 | const uid_t prev_ruid = getuid(); |
1109 | const gid_t prev_rgid = getgid(); | |
7567352f | 1110 | |
fe9f7760 FD |
1111 | /* |
1112 | * Stage 1: Receive run_as_data struct from the master. | |
1113 | * The structure contains the command type and all the parameters needed for | |
1114 | * its execution | |
1115 | */ | |
7567352f MD |
1116 | readlen = lttcomm_recv_unix_sock(worker->sockpair[1], &data, |
1117 | sizeof(data)); | |
1118 | if (readlen == 0) { | |
1119 | /* hang up */ | |
1120 | ret = 1; | |
1121 | goto end; | |
1122 | } | |
1123 | if (readlen < sizeof(data)) { | |
1124 | PERROR("lttcomm_recv_unix_sock error"); | |
1125 | ret = -1; | |
1126 | goto end; | |
1127 | } | |
c2b75c49 | 1128 | |
7567352f MD |
1129 | cmd = run_as_enum_to_fct(data.cmd); |
1130 | if (!cmd) { | |
1131 | ret = -1; | |
1132 | goto end; | |
1133 | } | |
1134 | ||
fe9f7760 FD |
1135 | /* |
1136 | * Stage 2: Receive file descriptor from master. | |
1137 | * Some commands need a file descriptor as input so if it's needed we | |
1138 | * receive the fd using the Unix socket. | |
1139 | */ | |
93bed9fe | 1140 | ret = recv_fds_from_master(worker, &data); |
fe9f7760 FD |
1141 | if (ret < 0) { |
1142 | PERROR("recv_fd_from_master error"); | |
1143 | ret = -1; | |
1144 | goto end; | |
1145 | } | |
1146 | ||
37ccf8ec FD |
1147 | ret = demote_creds(prev_ruid, prev_rgid, data.uid, data.gid); |
1148 | if (ret < 0) { | |
1149 | goto write_return; | |
c2b75c49 | 1150 | } |
fe9f7760 | 1151 | |
c2b75c49 MD |
1152 | /* |
1153 | * Also set umask to 0 for mkdir executable bit. | |
1154 | */ | |
1155 | umask(0); | |
fe9f7760 FD |
1156 | |
1157 | /* | |
1158 | * Stage 3: Execute the command | |
1159 | */ | |
1160 | ret = (*cmd)(&data, &sendret); | |
1161 | if (ret < 0) { | |
1162 | DBG("Execution of command returned an error"); | |
1163 | } | |
6d73c4ef MD |
1164 | |
1165 | write_return: | |
93bed9fe | 1166 | ret = cleanup_received_fds(&data); |
fe9f7760 FD |
1167 | if (ret < 0) { |
1168 | ERR("Error cleaning up FD"); | |
37ccf8ec | 1169 | goto promote_back; |
fe9f7760 FD |
1170 | } |
1171 | ||
1172 | /* | |
1173 | * Stage 4: Send run_as_ret structure to the master. | |
1174 | * This structure contain the return value of the command and the errno. | |
1175 | */ | |
7567352f MD |
1176 | writelen = lttcomm_send_unix_sock(worker->sockpair[1], &sendret, |
1177 | sizeof(sendret)); | |
6cd525e8 | 1178 | if (writelen < sizeof(sendret)) { |
7567352f MD |
1179 | PERROR("lttcomm_send_unix_sock error"); |
1180 | ret = -1; | |
37ccf8ec | 1181 | goto promote_back; |
7567352f | 1182 | } |
fe9f7760 FD |
1183 | |
1184 | /* | |
93bed9fe | 1185 | * Stage 5: Send resulting file descriptors to the master. |
fe9f7760 | 1186 | */ |
93bed9fe | 1187 | ret = send_fds_to_master(worker, data.cmd, &sendret); |
fe9f7760 FD |
1188 | if (ret < 0) { |
1189 | DBG("Sending FD to master returned an error"); | |
7567352f | 1190 | } |
fe9f7760 | 1191 | |
7567352f | 1192 | ret = 0; |
37ccf8ec FD |
1193 | |
1194 | promote_back: | |
1195 | /* Return to previous uid/gid. */ | |
1196 | promote_ret = promote_creds(data.uid, data.gid, prev_ruid, prev_rgid); | |
1197 | if (promote_ret < 0) { | |
1198 | ERR("Failed to promote back to the initial credentials"); | |
1199 | } | |
1200 | ||
7567352f MD |
1201 | end: |
1202 | return ret; | |
1203 | } | |
1204 | ||
1205 | static | |
a6bc4ca9 | 1206 | int run_as_worker(run_as_worker_data *worker) |
7567352f MD |
1207 | { |
1208 | int ret; | |
1209 | ssize_t writelen; | |
1210 | struct run_as_ret sendret; | |
1211 | size_t proc_orig_len; | |
1212 | ||
1213 | /* | |
1214 | * Initialize worker. Set a different process cmdline. | |
1215 | */ | |
1216 | proc_orig_len = strlen(worker->procname); | |
1217 | memset(worker->procname, 0, proc_orig_len); | |
1218 | strncpy(worker->procname, DEFAULT_RUN_AS_WORKER_NAME, proc_orig_len); | |
1219 | ||
cb8d0d24 | 1220 | ret = lttng_thread_setname(DEFAULT_RUN_AS_WORKER_NAME); |
e1055edb | 1221 | if (ret && ret != -ENOSYS) { |
b8090274 | 1222 | /* Don't fail as this is not essential. */ |
cb8d0d24 | 1223 | DBG("Failed to set pthread name attribute"); |
6cd525e8 | 1224 | } |
7567352f | 1225 | |
fe9f7760 FD |
1226 | memset(&sendret, 0, sizeof(sendret)); |
1227 | ||
7567352f MD |
1228 | writelen = lttcomm_send_unix_sock(worker->sockpair[1], &sendret, |
1229 | sizeof(sendret)); | |
1230 | if (writelen < sizeof(sendret)) { | |
1231 | PERROR("lttcomm_send_unix_sock error"); | |
1232 | ret = EXIT_FAILURE; | |
1233 | goto end; | |
1234 | } | |
1235 | ||
1236 | for (;;) { | |
1237 | ret = handle_one_cmd(worker); | |
1238 | if (ret < 0) { | |
1239 | ret = EXIT_FAILURE; | |
1240 | goto end; | |
1241 | } else if (ret > 0) { | |
1242 | break; | |
1243 | } else { | |
1244 | continue; /* Next command. */ | |
1245 | } | |
1246 | } | |
1247 | ret = EXIT_SUCCESS; | |
1248 | end: | |
1249 | return ret; | |
c2b75c49 MD |
1250 | } |
1251 | ||
60b6c79c | 1252 | static |
a6bc4ca9 | 1253 | int run_as_cmd(run_as_worker_data *worker, |
7567352f MD |
1254 | enum run_as_cmd cmd, |
1255 | struct run_as_data *data, | |
fe9f7760 | 1256 | struct run_as_ret *ret_value, |
7567352f | 1257 | uid_t uid, gid_t gid) |
60b6c79c | 1258 | { |
fe9f7760 | 1259 | int ret = 0; |
7567352f | 1260 | ssize_t readlen, writelen; |
60b6c79c MD |
1261 | |
1262 | /* | |
1263 | * If we are non-root, we can only deal with our own uid. | |
1264 | */ | |
1265 | if (geteuid() != 0) { | |
1266 | if (uid != geteuid()) { | |
fe9f7760 FD |
1267 | ret = -1; |
1268 | ret_value->_errno = EPERM; | |
60b6c79c | 1269 | ERR("Client (%d)/Server (%d) UID mismatch (and sessiond is not root)", |
08797918 | 1270 | (int) uid, (int) geteuid()); |
df5b86c8 | 1271 | goto end; |
60b6c79c | 1272 | } |
60b6c79c MD |
1273 | } |
1274 | ||
7567352f MD |
1275 | data->cmd = cmd; |
1276 | data->uid = uid; | |
1277 | data->gid = gid; | |
1278 | ||
fe9f7760 FD |
1279 | /* |
1280 | * Stage 1: Send the run_as_data struct to the worker process | |
1281 | */ | |
7567352f MD |
1282 | writelen = lttcomm_send_unix_sock(worker->sockpair[0], data, |
1283 | sizeof(*data)); | |
1284 | if (writelen < sizeof(*data)) { | |
1285 | PERROR("Error writing message to run_as"); | |
fe9f7760 FD |
1286 | ret = -1; |
1287 | ret_value->_errno = EIO; | |
60b6c79c | 1288 | goto end; |
c2b75c49 | 1289 | } |
7567352f | 1290 | |
fe9f7760 FD |
1291 | /* |
1292 | * Stage 2: Send file descriptor to the worker process if needed | |
1293 | */ | |
93bed9fe | 1294 | ret = send_fds_to_worker(worker, data); |
fe9f7760 FD |
1295 | if (ret) { |
1296 | PERROR("do_send_fd error"); | |
1297 | ret = -1; | |
1298 | ret_value->_errno = EIO; | |
1299 | goto end; | |
1300 | } | |
1301 | ||
1302 | /* | |
1303 | * Stage 3: Wait for the execution of the command | |
1304 | */ | |
1305 | ||
1306 | /* | |
1307 | * Stage 4: Receive the run_as_ret struct containing the return value and | |
1308 | * errno | |
1309 | */ | |
1310 | readlen = lttcomm_recv_unix_sock(worker->sockpair[0], ret_value, | |
1311 | sizeof(*ret_value)); | |
da9ee832 JG |
1312 | if (!readlen) { |
1313 | ERR("Run-as worker has hung-up during run_as_cmd"); | |
fe9f7760 FD |
1314 | ret = -1; |
1315 | ret_value->_errno = EIO; | |
da9ee832 | 1316 | goto end; |
fe9f7760 | 1317 | } else if (readlen < sizeof(*ret_value)) { |
7567352f | 1318 | PERROR("Error reading response from run_as"); |
fe9f7760 FD |
1319 | ret = -1; |
1320 | ret_value->_errno = errno; | |
033b58a7 | 1321 | goto end; |
6cd525e8 | 1322 | } |
fe9f7760 | 1323 | |
ca9eb994 JG |
1324 | if (ret_value->_error) { |
1325 | /* Skip stage 5 on error as there will be no fd to receive. */ | |
1326 | goto end; | |
1327 | } | |
1328 | ||
fe9f7760 FD |
1329 | /* |
1330 | * Stage 5: Receive file descriptor if needed | |
1331 | */ | |
93bed9fe | 1332 | ret = recv_fds_from_worker(worker, cmd, ret_value); |
fe9f7760 FD |
1333 | if (ret < 0) { |
1334 | ERR("Error receiving fd"); | |
1335 | ret = -1; | |
1336 | ret_value->_errno = EIO; | |
4c462e79 | 1337 | } |
7567352f | 1338 | |
60b6c79c | 1339 | end: |
fe9f7760 | 1340 | return ret; |
60b6c79c MD |
1341 | } |
1342 | ||
2d85a600 | 1343 | /* |
7567352f | 1344 | * This is for debugging ONLY and should not be considered secure. |
2d85a600 MD |
1345 | */ |
1346 | static | |
fe9f7760 FD |
1347 | int run_as_noworker(enum run_as_cmd cmd, |
1348 | struct run_as_data *data, struct run_as_ret *ret_value, | |
f46376a1 | 1349 | uid_t uid __attribute__((unused)), gid_t gid __attribute__((unused))) |
2d85a600 | 1350 | { |
df5b86c8 | 1351 | int ret, saved_errno; |
5b73926f | 1352 | mode_t old_mask; |
7567352f | 1353 | run_as_fct fct; |
5b73926f | 1354 | |
7567352f MD |
1355 | fct = run_as_enum_to_fct(cmd); |
1356 | if (!fct) { | |
1357 | errno = -ENOSYS; | |
1358 | ret = -1; | |
1359 | goto end; | |
1360 | } | |
5b73926f | 1361 | old_mask = umask(0); |
fe9f7760 FD |
1362 | ret = fct(data, ret_value); |
1363 | saved_errno = ret_value->_errno; | |
5b73926f | 1364 | umask(old_mask); |
df5b86c8 | 1365 | errno = saved_errno; |
7567352f | 1366 | end: |
5b73926f | 1367 | return ret; |
2d85a600 MD |
1368 | } |
1369 | ||
8fec83ea JG |
1370 | static |
1371 | int reset_sighandler(void) | |
1372 | { | |
1373 | int sig; | |
1374 | ||
1375 | DBG("Resetting run_as worker signal handlers to default"); | |
1376 | for (sig = 1; sig <= 31; sig++) { | |
1377 | (void) signal(sig, SIG_DFL); | |
1378 | } | |
1379 | return 0; | |
1380 | } | |
1381 | ||
1382 | static | |
1383 | void worker_sighandler(int sig) | |
1384 | { | |
1385 | const char *signame; | |
1386 | ||
1387 | /* | |
1388 | * The worker will inherit its parent's signals since they are part of | |
1389 | * the same process group. However, in the case of SIGINT and SIGTERM, | |
1390 | * we want to give the worker a chance to teardown gracefully when its | |
1391 | * parent closes the command socket. | |
1392 | */ | |
1393 | switch (sig) { | |
1394 | case SIGINT: | |
1395 | signame = "SIGINT"; | |
1396 | break; | |
1397 | case SIGTERM: | |
1398 | signame = "SIGTERM"; | |
1399 | break; | |
1400 | default: | |
1401 | signame = NULL; | |
1402 | } | |
1403 | ||
1404 | if (signame) { | |
1405 | DBG("run_as worker received signal %s", signame); | |
1406 | } else { | |
1407 | DBG("run_as_worker received signal %d", sig); | |
1408 | } | |
1409 | } | |
1410 | ||
1411 | static | |
1412 | int set_worker_sighandlers(void) | |
1413 | { | |
1414 | int ret = 0; | |
1415 | sigset_t sigset; | |
1416 | struct sigaction sa; | |
1417 | ||
1418 | if ((ret = sigemptyset(&sigset)) < 0) { | |
1419 | PERROR("sigemptyset"); | |
1420 | goto end; | |
1421 | } | |
1422 | ||
1423 | sa.sa_handler = worker_sighandler; | |
1424 | sa.sa_mask = sigset; | |
1425 | sa.sa_flags = 0; | |
1426 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { | |
1427 | PERROR("sigaction SIGINT"); | |
1428 | goto end; | |
1429 | } | |
1430 | ||
1431 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
1432 | PERROR("sigaction SIGTERM"); | |
1433 | goto end; | |
1434 | } | |
1435 | ||
1436 | DBG("run_as signal handler set for SIGTERM and SIGINT"); | |
1437 | end: | |
1438 | return ret; | |
1439 | } | |
1440 | ||
1441 | static | |
929f71ec JG |
1442 | int run_as_create_worker_no_lock(const char *procname, |
1443 | post_fork_cleanup_cb clean_up_func, | |
1444 | void *clean_up_user_data) | |
8fec83ea JG |
1445 | { |
1446 | pid_t pid; | |
1447 | int i, ret = 0; | |
1448 | ssize_t readlen; | |
1449 | struct run_as_ret recvret; | |
a6bc4ca9 | 1450 | run_as_worker_data *worker; |
8fec83ea | 1451 | |
a0377dfe | 1452 | LTTNG_ASSERT(!global_worker); |
8fec83ea JG |
1453 | if (!use_clone()) { |
1454 | /* | |
1455 | * Don't initialize a worker, all run_as tasks will be performed | |
1456 | * in the current process. | |
1457 | */ | |
1458 | ret = 0; | |
1459 | goto end; | |
1460 | } | |
a6bc4ca9 | 1461 | worker = (run_as_worker_data *) zmalloc(sizeof(*worker)); |
8fec83ea JG |
1462 | if (!worker) { |
1463 | ret = -ENOMEM; | |
1464 | goto end; | |
1465 | } | |
1466 | worker->procname = strdup(procname); | |
1467 | if (!worker->procname) { | |
1468 | ret = -ENOMEM; | |
8c96eded | 1469 | goto error_procname_alloc; |
8fec83ea JG |
1470 | } |
1471 | /* Create unix socket. */ | |
1472 | if (lttcomm_create_anon_unix_socketpair(worker->sockpair) < 0) { | |
1473 | ret = -1; | |
1474 | goto error_sock; | |
1475 | } | |
1476 | ||
1477 | /* Fork worker. */ | |
1478 | pid = fork(); | |
1479 | if (pid < 0) { | |
1480 | PERROR("fork"); | |
1481 | ret = -1; | |
1482 | goto error_fork; | |
1483 | } else if (pid == 0) { | |
1484 | /* Child */ | |
1485 | ||
1486 | reset_sighandler(); | |
1487 | ||
1488 | set_worker_sighandlers(); | |
c989e0d4 FD |
1489 | |
1490 | logger_set_thread_name("Run-as worker", true); | |
1491 | ||
929f71ec JG |
1492 | if (clean_up_func) { |
1493 | if (clean_up_func(clean_up_user_data) < 0) { | |
1494 | ERR("Run-as post-fork clean-up failed, exiting."); | |
1495 | exit(EXIT_FAILURE); | |
1496 | } | |
1497 | } | |
8fec83ea JG |
1498 | |
1499 | /* Just close, no shutdown. */ | |
1500 | if (close(worker->sockpair[0])) { | |
1501 | PERROR("close"); | |
1502 | exit(EXIT_FAILURE); | |
1503 | } | |
1504 | ||
1505 | /* | |
1506 | * Close all FDs aside from STDIN, STDOUT, STDERR and sockpair[1] | |
1507 | * Sockpair[1] is used as a control channel with the master | |
1508 | */ | |
1509 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
1510 | if (i != worker->sockpair[1]) { | |
1511 | (void) close(i); | |
1512 | } | |
1513 | } | |
1514 | ||
1515 | worker->sockpair[0] = -1; | |
1516 | ret = run_as_worker(worker); | |
1517 | if (lttcomm_close_unix_sock(worker->sockpair[1])) { | |
1518 | PERROR("close"); | |
1519 | ret = -1; | |
1520 | } | |
1521 | worker->sockpair[1] = -1; | |
55cb0d6f | 1522 | free(worker->procname); |
340cf672 | 1523 | free(worker); |
8fec83ea JG |
1524 | LOG(ret ? PRINT_ERR : PRINT_DBG, "run_as worker exiting (ret = %d)", ret); |
1525 | exit(ret ? EXIT_FAILURE : EXIT_SUCCESS); | |
1526 | } else { | |
1527 | /* Parent */ | |
1528 | ||
1529 | /* Just close, no shutdown. */ | |
1530 | if (close(worker->sockpair[1])) { | |
1531 | PERROR("close"); | |
1532 | ret = -1; | |
1533 | goto error_fork; | |
1534 | } | |
1535 | worker->sockpair[1] = -1; | |
1536 | worker->pid = pid; | |
1537 | /* Wait for worker to become ready. */ | |
1538 | readlen = lttcomm_recv_unix_sock(worker->sockpair[0], | |
1539 | &recvret, sizeof(recvret)); | |
1540 | if (readlen < sizeof(recvret)) { | |
1541 | ERR("readlen: %zd", readlen); | |
1542 | PERROR("Error reading response from run_as at creation"); | |
1543 | ret = -1; | |
1544 | goto error_fork; | |
1545 | } | |
1546 | global_worker = worker; | |
1547 | } | |
1548 | end: | |
1549 | return ret; | |
1550 | ||
1551 | /* Error handling. */ | |
1552 | error_fork: | |
1553 | for (i = 0; i < 2; i++) { | |
1554 | if (worker->sockpair[i] < 0) { | |
1555 | continue; | |
1556 | } | |
1557 | if (lttcomm_close_unix_sock(worker->sockpair[i])) { | |
1558 | PERROR("close"); | |
1559 | } | |
1560 | worker->sockpair[i] = -1; | |
1561 | } | |
1562 | error_sock: | |
8c96eded FD |
1563 | free(worker->procname); |
1564 | error_procname_alloc: | |
8fec83ea JG |
1565 | free(worker); |
1566 | return ret; | |
1567 | } | |
1568 | ||
a01c682b JR |
1569 | static |
1570 | void run_as_destroy_worker_no_lock(void) | |
1571 | { | |
a6bc4ca9 | 1572 | run_as_worker_data *worker = global_worker; |
a01c682b JR |
1573 | |
1574 | DBG("Destroying run_as worker"); | |
1575 | if (!worker) { | |
1576 | return; | |
1577 | } | |
1578 | /* Close unix socket */ | |
1579 | DBG("Closing run_as worker socket"); | |
1580 | if (lttcomm_close_unix_sock(worker->sockpair[0])) { | |
1581 | PERROR("close"); | |
1582 | } | |
1583 | worker->sockpair[0] = -1; | |
1584 | /* Wait for worker. */ | |
1585 | for (;;) { | |
1586 | int status; | |
1587 | pid_t wait_ret; | |
1588 | ||
1589 | wait_ret = waitpid(worker->pid, &status, 0); | |
1590 | if (wait_ret < 0) { | |
1591 | if (errno == EINTR) { | |
1592 | continue; | |
1593 | } | |
1594 | PERROR("waitpid"); | |
1595 | break; | |
1596 | } | |
1597 | ||
1598 | if (WIFEXITED(status)) { | |
1599 | LOG(WEXITSTATUS(status) == 0 ? PRINT_DBG : PRINT_ERR, | |
1600 | DEFAULT_RUN_AS_WORKER_NAME " terminated with status code %d", | |
55cb0d6f | 1601 | WEXITSTATUS(status)); |
a01c682b JR |
1602 | break; |
1603 | } else if (WIFSIGNALED(status)) { | |
1604 | ERR(DEFAULT_RUN_AS_WORKER_NAME " was killed by signal %d", | |
1605 | WTERMSIG(status)); | |
1606 | break; | |
1607 | } | |
1608 | } | |
1609 | free(worker->procname); | |
1610 | free(worker); | |
1611 | global_worker = NULL; | |
1612 | } | |
1613 | ||
2d85a600 | 1614 | static |
a6bc4ca9 | 1615 | int run_as_restart_worker(run_as_worker_data *worker) |
2d85a600 | 1616 | { |
fe9f7760 FD |
1617 | int ret = 0; |
1618 | char *procname = NULL; | |
1619 | ||
1620 | procname = worker->procname; | |
1621 | ||
1622 | /* Close socket to run_as worker process and clean up the zombie process */ | |
a01c682b | 1623 | run_as_destroy_worker_no_lock(); |
fe9f7760 FD |
1624 | |
1625 | /* Create a new run_as worker process*/ | |
929f71ec | 1626 | ret = run_as_create_worker_no_lock(procname, NULL, NULL); |
fe9f7760 FD |
1627 | if (ret < 0 ) { |
1628 | ERR("Restarting the worker process failed"); | |
1629 | ret = -1; | |
1630 | goto err; | |
1631 | } | |
1632 | err: | |
1633 | return ret; | |
1634 | } | |
1635 | ||
1636 | static | |
1637 | int run_as(enum run_as_cmd cmd, struct run_as_data *data, | |
1638 | struct run_as_ret *ret_value, uid_t uid, gid_t gid) | |
1639 | { | |
1640 | int ret, saved_errno; | |
7567352f | 1641 | |
8fec83ea | 1642 | pthread_mutex_lock(&worker_lock); |
749b7a0c | 1643 | if (use_clone()) { |
7567352f | 1644 | DBG("Using run_as worker"); |
8fec83ea | 1645 | |
a0377dfe | 1646 | LTTNG_ASSERT(global_worker); |
749b7a0c | 1647 | |
fe9f7760 FD |
1648 | ret = run_as_cmd(global_worker, cmd, data, ret_value, uid, gid); |
1649 | saved_errno = ret_value->_errno; | |
1650 | ||
fe9f7760 FD |
1651 | /* |
1652 | * If the worker thread crashed the errno is set to EIO. we log | |
1653 | * the error and start a new worker process. | |
1654 | */ | |
1655 | if (ret == -1 && saved_errno == EIO) { | |
1656 | DBG("Socket closed unexpectedly... " | |
1657 | "Restarting the worker process"); | |
1658 | ret = run_as_restart_worker(global_worker); | |
fe9f7760 FD |
1659 | if (ret == -1) { |
1660 | ERR("Failed to restart worker process."); | |
1661 | goto err; | |
1662 | } | |
1663 | } | |
2d85a600 | 1664 | } else { |
7567352f | 1665 | DBG("Using run_as without worker"); |
fe9f7760 | 1666 | ret = run_as_noworker(cmd, data, ret_value, uid, gid); |
2d85a600 | 1667 | } |
fe9f7760 | 1668 | err: |
8fec83ea | 1669 | pthread_mutex_unlock(&worker_lock); |
7567352f | 1670 | return ret; |
2d85a600 MD |
1671 | } |
1672 | ||
e11d277b | 1673 | int run_as_mkdir_recursive(const char *path, mode_t mode, uid_t uid, gid_t gid) |
60b6c79c | 1674 | { |
18710679 JG |
1675 | return run_as_mkdirat_recursive(AT_FDCWD, path, mode, uid, gid); |
1676 | } | |
1677 | ||
18710679 JG |
1678 | int run_as_mkdirat_recursive(int dirfd, const char *path, mode_t mode, |
1679 | uid_t uid, gid_t gid) | |
1680 | { | |
1681 | int ret; | |
93bed9fe JG |
1682 | struct run_as_data data = {}; |
1683 | struct run_as_ret run_as_ret = {}; | |
60b6c79c | 1684 | |
18710679 JG |
1685 | DBG3("mkdirat() recursive fd = %d%s, path = %s, mode = %d, uid = %d, gid = %d", |
1686 | dirfd, dirfd == AT_FDCWD ? " (AT_FDCWD)" : "", | |
08797918 | 1687 | path, (int) mode, (int) uid, (int) gid); |
93bed9fe JG |
1688 | ret = lttng_strncpy(data.u.mkdir.path, path, |
1689 | sizeof(data.u.mkdir.path)); | |
18710679 JG |
1690 | if (ret) { |
1691 | ERR("Failed to copy path argument of mkdirat recursive command"); | |
1692 | goto error; | |
1693 | } | |
93bed9fe JG |
1694 | data.u.mkdir.path[sizeof(data.u.mkdir.path) - 1] = '\0'; |
1695 | data.u.mkdir.mode = mode; | |
1696 | data.u.mkdir.dirfd = dirfd; | |
18710679 JG |
1697 | run_as(dirfd == AT_FDCWD ? RUN_AS_MKDIR_RECURSIVE : RUN_AS_MKDIRAT_RECURSIVE, |
1698 | &data, &run_as_ret, uid, gid); | |
1699 | errno = run_as_ret._errno; | |
93bed9fe | 1700 | ret = run_as_ret.u.ret; |
18710679 JG |
1701 | error: |
1702 | return ret; | |
60b6c79c MD |
1703 | } |
1704 | ||
e11d277b | 1705 | int run_as_mkdir(const char *path, mode_t mode, uid_t uid, gid_t gid) |
60b6c79c | 1706 | { |
18710679 JG |
1707 | return run_as_mkdirat(AT_FDCWD, path, mode, uid, gid); |
1708 | } | |
1709 | ||
18710679 JG |
1710 | int run_as_mkdirat(int dirfd, const char *path, mode_t mode, |
1711 | uid_t uid, gid_t gid) | |
1712 | { | |
1713 | int ret; | |
93bed9fe JG |
1714 | struct run_as_data data = {}; |
1715 | struct run_as_ret run_as_ret = {}; | |
fe9f7760 | 1716 | |
18710679 JG |
1717 | DBG3("mkdirat() recursive fd = %d%s, path = %s, mode = %d, uid = %d, gid = %d", |
1718 | dirfd, dirfd == AT_FDCWD ? " (AT_FDCWD)" : "", | |
08797918 | 1719 | path, (int) mode, (int) uid, (int) gid); |
93bed9fe JG |
1720 | ret = lttng_strncpy(data.u.mkdir.path, path, |
1721 | sizeof(data.u.mkdir.path)); | |
18710679 JG |
1722 | if (ret) { |
1723 | ERR("Failed to copy path argument of mkdirat command"); | |
1724 | goto error; | |
1725 | } | |
93bed9fe JG |
1726 | data.u.mkdir.path[sizeof(data.u.mkdir.path) - 1] = '\0'; |
1727 | data.u.mkdir.mode = mode; | |
1728 | data.u.mkdir.dirfd = dirfd; | |
18710679 JG |
1729 | run_as(dirfd == AT_FDCWD ? RUN_AS_MKDIR : RUN_AS_MKDIRAT, |
1730 | &data, &run_as_ret, uid, gid); | |
1731 | errno = run_as_ret._errno; | |
93bed9fe | 1732 | ret = run_as_ret.u.ret; |
18710679 JG |
1733 | error: |
1734 | return ret; | |
60b6c79c MD |
1735 | } |
1736 | ||
2912cead | 1737 | int run_as_open(const char *path, int flags, mode_t mode, uid_t uid, |
55cb0d6f | 1738 | gid_t gid) |
2912cead JG |
1739 | { |
1740 | return run_as_openat(AT_FDCWD, path, flags, mode, uid, gid); | |
1741 | } | |
1742 | ||
2912cead JG |
1743 | int run_as_openat(int dirfd, const char *path, int flags, mode_t mode, |
1744 | uid_t uid, gid_t gid) | |
60b6c79c | 1745 | { |
93bed9fe | 1746 | int ret; |
55cb0d6f JG |
1747 | struct run_as_data data = {}; |
1748 | struct run_as_ret run_as_ret = {}; | |
fe9f7760 | 1749 | |
2912cead JG |
1750 | DBG3("openat() fd = %d%s, path = %s, flags = %X, mode = %d, uid %d, gid %d", |
1751 | dirfd, dirfd == AT_FDCWD ? " (AT_FDCWD)" : "", | |
08797918 | 1752 | path, flags, (int) mode, (int) uid, (int) gid); |
93bed9fe JG |
1753 | ret = lttng_strncpy(data.u.open.path, path, sizeof(data.u.open.path)); |
1754 | if (ret) { | |
1755 | ERR("Failed to copy path argument of open command"); | |
1756 | goto error; | |
1757 | } | |
7567352f MD |
1758 | data.u.open.flags = flags; |
1759 | data.u.open.mode = mode; | |
93bed9fe | 1760 | data.u.open.dirfd = dirfd; |
2912cead | 1761 | run_as(dirfd == AT_FDCWD ? RUN_AS_OPEN : RUN_AS_OPENAT, |
93bed9fe JG |
1762 | &data, &run_as_ret, uid, gid); |
1763 | errno = run_as_ret._errno; | |
1764 | ret = run_as_ret.u.ret < 0 ? run_as_ret.u.ret : | |
1765 | run_as_ret.u.open.fd; | |
1766 | error: | |
1767 | return ret; | |
60b6c79c | 1768 | } |
4628484a | 1769 | |
4628484a | 1770 | int run_as_unlink(const char *path, uid_t uid, gid_t gid) |
2912cead JG |
1771 | { |
1772 | return run_as_unlinkat(AT_FDCWD, path, uid, gid); | |
1773 | } | |
1774 | ||
2912cead | 1775 | int run_as_unlinkat(int dirfd, const char *path, uid_t uid, gid_t gid) |
4628484a | 1776 | { |
93bed9fe JG |
1777 | int ret; |
1778 | struct run_as_data data = {}; | |
1779 | struct run_as_ret run_as_ret = {}; | |
fe9f7760 | 1780 | |
2912cead JG |
1781 | DBG3("unlinkat() fd = %d%s, path = %s, uid = %d, gid = %d", |
1782 | dirfd, dirfd == AT_FDCWD ? " (AT_FDCWD)" : "", | |
08797918 | 1783 | path, (int) uid, (int) gid); |
93bed9fe JG |
1784 | ret = lttng_strncpy(data.u.unlink.path, path, |
1785 | sizeof(data.u.unlink.path)); | |
1786 | if (ret) { | |
1787 | goto error; | |
1788 | } | |
1789 | data.u.unlink.dirfd = dirfd; | |
1790 | run_as(dirfd == AT_FDCWD ? RUN_AS_UNLINK : RUN_AS_UNLINKAT, &data, | |
1791 | &run_as_ret, uid, gid); | |
1792 | errno = run_as_ret._errno; | |
1793 | ret = run_as_ret.u.ret; | |
1794 | error: | |
1795 | return ret; | |
1796 | } | |
1797 | ||
93bed9fe JG |
1798 | int run_as_rmdir(const char *path, uid_t uid, gid_t gid) |
1799 | { | |
1800 | return run_as_rmdirat(AT_FDCWD, path, uid, gid); | |
1801 | } | |
1802 | ||
93bed9fe JG |
1803 | int run_as_rmdirat(int dirfd, const char *path, uid_t uid, gid_t gid) |
1804 | { | |
1805 | int ret; | |
1806 | struct run_as_data data = {}; | |
1807 | struct run_as_ret run_as_ret = {}; | |
1808 | ||
1809 | DBG3("rmdirat() fd = %d%s, path = %s, uid = %d, gid = %d", | |
1810 | dirfd, dirfd == AT_FDCWD ? " (AT_FDCWD)" : "", | |
1811 | path, (int) uid, (int) gid); | |
1812 | ret = lttng_strncpy(data.u.rmdir.path, path, | |
1813 | sizeof(data.u.rmdir.path)); | |
1814 | if (ret) { | |
1815 | goto error; | |
1816 | } | |
1817 | data.u.rmdir.dirfd = dirfd; | |
1818 | run_as(dirfd == AT_FDCWD ? RUN_AS_RMDIR : RUN_AS_RMDIRAT, &data, | |
1819 | &run_as_ret, uid, gid); | |
1820 | errno = run_as_ret._errno; | |
1821 | ret = run_as_ret.u.ret; | |
1822 | error: | |
1823 | return ret; | |
4628484a MD |
1824 | } |
1825 | ||
f75c5439 | 1826 | int run_as_rmdir_recursive(const char *path, uid_t uid, gid_t gid, int flags) |
4628484a | 1827 | { |
f75c5439 | 1828 | return run_as_rmdirat_recursive(AT_FDCWD, path, uid, gid, flags); |
93bed9fe | 1829 | } |
fe9f7760 | 1830 | |
f75c5439 | 1831 | int run_as_rmdirat_recursive(int dirfd, const char *path, uid_t uid, gid_t gid, int flags) |
93bed9fe JG |
1832 | { |
1833 | int ret; | |
1834 | struct run_as_data data = {}; | |
1835 | struct run_as_ret run_as_ret = {}; | |
4628484a | 1836 | |
93bed9fe JG |
1837 | DBG3("rmdirat() recursive fd = %d%s, path = %s, uid = %d, gid = %d", |
1838 | dirfd, dirfd == AT_FDCWD ? " (AT_FDCWD)" : "", | |
08797918 | 1839 | path, (int) uid, (int) gid); |
93bed9fe JG |
1840 | ret = lttng_strncpy(data.u.rmdir.path, path, |
1841 | sizeof(data.u.rmdir.path)); | |
1842 | if (ret) { | |
1843 | goto error; | |
1844 | } | |
1845 | data.u.rmdir.dirfd = dirfd; | |
f75c5439 | 1846 | data.u.rmdir.flags = flags; |
93bed9fe JG |
1847 | run_as(dirfd == AT_FDCWD ? RUN_AS_RMDIR_RECURSIVE : RUN_AS_RMDIRAT_RECURSIVE, |
1848 | &data, &run_as_ret, uid, gid); | |
1849 | errno = run_as_ret._errno; | |
1850 | ret = run_as_ret.u.ret; | |
1851 | error: | |
1852 | return ret; | |
1853 | } | |
1854 | ||
a6bc4ca9 | 1855 | int run_as_rename(const char *old_name, const char *new_name, uid_t uid, gid_t gid) |
93bed9fe | 1856 | { |
a6bc4ca9 | 1857 | return run_as_renameat(AT_FDCWD, old_name, AT_FDCWD, new_name, uid, gid); |
93bed9fe JG |
1858 | } |
1859 | ||
93bed9fe JG |
1860 | int run_as_renameat(int old_dirfd, const char *old_name, |
1861 | int new_dirfd, const char *new_name, uid_t uid, gid_t gid) | |
1862 | { | |
1863 | int ret; | |
1864 | struct run_as_data data = {}; | |
1865 | struct run_as_ret run_as_ret = {}; | |
1866 | ||
1867 | DBG3("renameat() old_dirfd = %d%s, old_name = %s, new_dirfd = %d%s, new_name = %s, uid = %d, gid = %d", | |
1868 | old_dirfd, old_dirfd == AT_FDCWD ? " (AT_FDCWD)" : "", | |
1869 | old_name, | |
1870 | new_dirfd, new_dirfd == AT_FDCWD ? " (AT_FDCWD)" : "", | |
1871 | new_name, (int) uid, (int) gid); | |
1872 | ret = lttng_strncpy(data.u.rename.old_path, old_name, | |
1873 | sizeof(data.u.rename.old_path)); | |
1874 | if (ret) { | |
1875 | goto error; | |
1876 | } | |
1877 | ret = lttng_strncpy(data.u.rename.new_path, new_name, | |
1878 | sizeof(data.u.rename.new_path)); | |
1879 | if (ret) { | |
1880 | goto error; | |
1881 | } | |
1882 | ||
1883 | data.u.rename.dirfds[0] = old_dirfd; | |
1884 | data.u.rename.dirfds[1] = new_dirfd; | |
1885 | run_as(old_dirfd == AT_FDCWD && new_dirfd == AT_FDCWD ? | |
1886 | RUN_AS_RENAME : RUN_AS_RENAMEAT, | |
1887 | &data, &run_as_ret, uid, gid); | |
1888 | errno = run_as_ret._errno; | |
1889 | ret = run_as_ret.u.ret; | |
1890 | error: | |
1891 | return ret; | |
7567352f MD |
1892 | } |
1893 | ||
241e0a5a FD |
1894 | int run_as_extract_elf_symbol_offset(int fd, const char* function, |
1895 | uid_t uid, gid_t gid, uint64_t *offset) | |
1896 | { | |
93bed9fe JG |
1897 | int ret; |
1898 | struct run_as_data data = {}; | |
55cb0d6f | 1899 | struct run_as_ret run_as_ret = {}; |
f726677b | 1900 | |
241e0a5a | 1901 | DBG3("extract_elf_symbol_offset() on fd=%d and function=%s " |
93bed9fe JG |
1902 | "with for uid %d and gid %d", fd, function, |
1903 | (int) uid, (int) gid); | |
241e0a5a | 1904 | |
93bed9fe | 1905 | data.u.extract_elf_symbol_offset.fd = fd; |
241e0a5a FD |
1906 | |
1907 | strncpy(data.u.extract_elf_symbol_offset.function, function, LTTNG_SYMBOL_NAME_LEN - 1); | |
241e0a5a | 1908 | data.u.extract_elf_symbol_offset.function[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
93bed9fe JG |
1909 | ret = lttng_strncpy(data.u.extract_elf_symbol_offset.function, |
1910 | function, | |
1911 | sizeof(data.u.extract_elf_symbol_offset.function)); | |
1912 | if (ret) { | |
1913 | goto error; | |
1914 | } | |
241e0a5a | 1915 | |
93bed9fe JG |
1916 | run_as(RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET, &data, &run_as_ret, uid, gid); |
1917 | errno = run_as_ret._errno; | |
1918 | if (run_as_ret._error) { | |
1919 | ret = -1; | |
1920 | goto error; | |
241e0a5a FD |
1921 | } |
1922 | ||
93bed9fe JG |
1923 | *offset = run_as_ret.u.extract_elf_symbol_offset.offset; |
1924 | error: | |
1925 | return ret; | |
241e0a5a FD |
1926 | } |
1927 | ||
0ef03255 FD |
1928 | int run_as_extract_sdt_probe_offsets(int fd, const char* provider_name, |
1929 | const char* probe_name, uid_t uid, gid_t gid, | |
1930 | uint64_t **offsets, uint32_t *num_offset) | |
1931 | { | |
93bed9fe JG |
1932 | int ret; |
1933 | struct run_as_data data = {}; | |
1934 | struct run_as_ret run_as_ret = {}; | |
f726677b | 1935 | |
0ef03255 | 1936 | DBG3("extract_sdt_probe_offsets() on fd=%d, probe_name=%s and " |
93bed9fe JG |
1937 | "provider_name=%s with for uid %d and gid %d", fd, |
1938 | probe_name, provider_name, (int) uid, (int) gid); | |
0ef03255 | 1939 | |
93bed9fe | 1940 | data.u.extract_sdt_probe_offsets.fd = fd; |
0ef03255 | 1941 | |
93bed9fe JG |
1942 | ret = lttng_strncpy(data.u.extract_sdt_probe_offsets.probe_name, probe_name, |
1943 | sizeof(data.u.extract_sdt_probe_offsets.probe_name)); | |
1944 | if (ret) { | |
1945 | goto error; | |
1946 | } | |
1947 | ret = lttng_strncpy(data.u.extract_sdt_probe_offsets.provider_name, | |
1948 | provider_name, | |
1949 | sizeof(data.u.extract_sdt_probe_offsets.provider_name)); | |
1950 | if (ret) { | |
1951 | goto error; | |
0ef03255 FD |
1952 | } |
1953 | ||
93bed9fe JG |
1954 | run_as(RUN_AS_EXTRACT_SDT_PROBE_OFFSETS, &data, &run_as_ret, uid, gid); |
1955 | errno = run_as_ret._errno; | |
1956 | if (run_as_ret._error) { | |
1957 | ret = -1; | |
1958 | goto error; | |
1959 | } | |
0ef03255 | 1960 | |
93bed9fe | 1961 | *num_offset = run_as_ret.u.extract_sdt_probe_offsets.num_offset; |
a6bc4ca9 | 1962 | *offsets = (uint64_t *) zmalloc(*num_offset * sizeof(uint64_t)); |
0ef03255 | 1963 | if (!*offsets) { |
93bed9fe JG |
1964 | ret = -ENOMEM; |
1965 | goto error; | |
0ef03255 FD |
1966 | } |
1967 | ||
93bed9fe JG |
1968 | memcpy(*offsets, run_as_ret.u.extract_sdt_probe_offsets.offsets, |
1969 | *num_offset * sizeof(uint64_t)); | |
1970 | error: | |
1971 | return ret; | |
0ef03255 FD |
1972 | } |
1973 | ||
c73f064a | 1974 | int run_as_generate_filter_bytecode(const char *filter_expression, |
58daac01 | 1975 | const struct lttng_credentials *creds, |
2b00d462 | 1976 | struct lttng_bytecode **bytecode) |
c73f064a JR |
1977 | { |
1978 | int ret; | |
1979 | struct run_as_data data = {}; | |
1980 | struct run_as_ret run_as_ret = {}; | |
2b00d462 SM |
1981 | const struct lttng_bytecode *view_bytecode = NULL; |
1982 | struct lttng_bytecode *local_bytecode = NULL; | |
58daac01 JR |
1983 | const uid_t uid = lttng_credentials_get_uid(creds); |
1984 | const gid_t gid = lttng_credentials_get_gid(creds); | |
c73f064a JR |
1985 | |
1986 | DBG3("generate_filter_bytecode() from expression=\"%s\" for uid %d and gid %d", | |
1987 | filter_expression, (int) uid, (int) gid); | |
1988 | ||
1989 | ret = lttng_strncpy(data.u.generate_filter_bytecode.filter_expression, filter_expression, | |
1990 | sizeof(data.u.generate_filter_bytecode.filter_expression)); | |
1991 | if (ret) { | |
1992 | goto error; | |
1993 | } | |
1994 | ||
1995 | run_as(RUN_AS_GENERATE_FILTER_BYTECODE, &data, &run_as_ret, uid, gid); | |
1996 | errno = run_as_ret._errno; | |
1997 | if (run_as_ret._error) { | |
1998 | ret = -1; | |
1999 | goto error; | |
2000 | } | |
2001 | ||
2b00d462 | 2002 | view_bytecode = (const struct lttng_bytecode *) run_as_ret.u.generate_filter_bytecode.bytecode; |
c73f064a | 2003 | |
a6bc4ca9 | 2004 | local_bytecode = (lttng_bytecode *) zmalloc(sizeof(*local_bytecode) + view_bytecode->len); |
c73f064a JR |
2005 | if (!local_bytecode) { |
2006 | ret = -ENOMEM; | |
2007 | goto error; | |
2008 | } | |
2009 | ||
2010 | memcpy(local_bytecode, run_as_ret.u.generate_filter_bytecode.bytecode, | |
2011 | sizeof(*local_bytecode) + view_bytecode->len); | |
2012 | *bytecode = local_bytecode; | |
2013 | error: | |
2014 | return ret; | |
2015 | } | |
2016 | ||
929f71ec JG |
2017 | int run_as_create_worker(const char *procname, |
2018 | post_fork_cleanup_cb clean_up_func, | |
2019 | void *clean_up_user_data) | |
7567352f | 2020 | { |
8fec83ea | 2021 | int ret; |
7567352f | 2022 | |
749b7a0c | 2023 | pthread_mutex_lock(&worker_lock); |
929f71ec JG |
2024 | ret = run_as_create_worker_no_lock(procname, clean_up_func, |
2025 | clean_up_user_data); | |
749b7a0c | 2026 | pthread_mutex_unlock(&worker_lock); |
7567352f MD |
2027 | return ret; |
2028 | } | |
2029 | ||
7567352f MD |
2030 | void run_as_destroy_worker(void) |
2031 | { | |
749b7a0c | 2032 | pthread_mutex_lock(&worker_lock); |
a01c682b | 2033 | run_as_destroy_worker_no_lock(); |
749b7a0c | 2034 | pthread_mutex_unlock(&worker_lock); |
4628484a | 2035 | } |