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 |
28ab034a JG |
11 | #include "runas.hpp" |
12 | ||
13 | #include <common/bytecode/bytecode.hpp> | |
14 | #include <common/common.hpp> | |
15 | #include <common/compat/errno.hpp> | |
16 | #include <common/compat/getenv.hpp> | |
17 | #include <common/compat/string.hpp> | |
18 | #include <common/defaults.hpp> | |
19 | #include <common/filter/filter-ast.hpp> | |
20 | #include <common/lttng-elf.hpp> | |
21 | #include <common/lttng-kernel.hpp> | |
22 | #include <common/sessiond-comm/sessiond-comm.hpp> | |
23 | #include <common/thread.hpp> | |
24 | #include <common/unix.hpp> | |
25 | #include <common/utils.hpp> | |
26 | ||
27 | #include <lttng/constant.h> | |
28 | ||
37ccf8ec FD |
29 | #include <fcntl.h> |
30 | #include <grp.h> | |
60b6c79c | 31 | #include <limits.h> |
37ccf8ec FD |
32 | #include <pwd.h> |
33 | #include <sched.h> | |
34 | #include <signal.h> | |
60b6c79c MD |
35 | #include <stdio.h> |
36 | #include <stdlib.h> | |
37 | #include <string.h> | |
60b6c79c | 38 | #include <sys/stat.h> |
37ccf8ec FD |
39 | #include <sys/types.h> |
40 | #include <sys/wait.h> | |
60b6c79c | 41 | #include <unistd.h> |
60b6c79c | 42 | |
37ccf8ec FD |
43 | #define GETPW_BUFFER_FALLBACK_SIZE 4096 |
44 | ||
93bed9fe JG |
45 | enum run_as_cmd { |
46 | RUN_AS_MKDIR, | |
47 | RUN_AS_MKDIRAT, | |
48 | RUN_AS_MKDIR_RECURSIVE, | |
49 | RUN_AS_MKDIRAT_RECURSIVE, | |
50 | RUN_AS_OPEN, | |
51 | RUN_AS_OPENAT, | |
52 | RUN_AS_UNLINK, | |
53 | RUN_AS_UNLINKAT, | |
54 | RUN_AS_RMDIR, | |
55 | RUN_AS_RMDIRAT, | |
56 | RUN_AS_RMDIR_RECURSIVE, | |
57 | RUN_AS_RMDIRAT_RECURSIVE, | |
58 | RUN_AS_RENAME, | |
59 | RUN_AS_RENAMEAT, | |
60 | RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET, | |
61 | RUN_AS_EXTRACT_SDT_PROBE_OFFSETS, | |
c73f064a | 62 | RUN_AS_GENERATE_FILTER_BYTECODE, |
60b6c79c MD |
63 | }; |
64 | ||
f1494934 JG |
65 | namespace { |
66 | struct run_as_data; | |
67 | struct run_as_ret; | |
68 | typedef int (*run_as_fct)(struct run_as_data *data, struct run_as_ret *ret_value); | |
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 | ||
28ab034a JG |
180 | #define COMMAND_IN_FDS(data_ptr) \ |
181 | ({ \ | |
182 | int *fds = NULL; \ | |
183 | if (command_properties[data_ptr->cmd].in_fds_offset != -1) { \ | |
184 | fds = (int *) ((char *) data_ptr + \ | |
185 | command_properties[data_ptr->cmd].in_fds_offset); \ | |
186 | } \ | |
187 | fds; \ | |
188 | }) | |
189 | ||
190 | #define COMMAND_OUT_FDS(cmd, ret_ptr) \ | |
191 | ({ \ | |
192 | int *fds = NULL; \ | |
193 | if (command_properties[cmd].out_fds_offset != -1) { \ | |
194 | fds = (int *) ((char *) ret_ptr + command_properties[cmd].out_fds_offset); \ | |
195 | } \ | |
196 | fds; \ | |
197 | }) | |
198 | ||
199 | #define COMMAND_IN_FD_COUNT(data_ptr) ({ command_properties[data_ptr->cmd].in_fd_count; }) | |
200 | ||
201 | #define COMMAND_OUT_FD_COUNT(cmd) ({ command_properties[cmd].out_fd_count; }) | |
93bed9fe JG |
202 | |
203 | #define COMMAND_USE_CWD_FD(data_ptr) command_properties[data_ptr->cmd].use_cwd_fd | |
204 | ||
205 | struct run_as_command_properties { | |
206 | /* Set to -1 when not applicable. */ | |
207 | ptrdiff_t in_fds_offset, out_fds_offset; | |
208 | unsigned int in_fd_count, out_fd_count; | |
209 | bool use_cwd_fd; | |
210 | }; | |
211 | ||
f1494934 | 212 | const struct run_as_command_properties command_properties[] = { |
a6bc4ca9 | 213 | { |
93bed9fe | 214 | .in_fds_offset = offsetof(struct run_as_data, u.mkdir.dirfd), |
93bed9fe | 215 | .out_fds_offset = -1, |
a6bc4ca9 | 216 | .in_fd_count = 1, |
93bed9fe JG |
217 | .out_fd_count = 0, |
218 | .use_cwd_fd = true, | |
219 | }, | |
a6bc4ca9 | 220 | { |
93bed9fe | 221 | .in_fds_offset = offsetof(struct run_as_data, u.mkdir.dirfd), |
93bed9fe | 222 | .out_fds_offset = -1, |
a6bc4ca9 | 223 | .in_fd_count = 1, |
93bed9fe JG |
224 | .out_fd_count = 0, |
225 | .use_cwd_fd = false, | |
226 | }, | |
a6bc4ca9 | 227 | { |
93bed9fe | 228 | .in_fds_offset = offsetof(struct run_as_data, u.mkdir.dirfd), |
93bed9fe | 229 | .out_fds_offset = -1, |
a6bc4ca9 | 230 | .in_fd_count = 1, |
93bed9fe JG |
231 | .out_fd_count = 0, |
232 | .use_cwd_fd = true, | |
233 | }, | |
a6bc4ca9 | 234 | { |
93bed9fe | 235 | .in_fds_offset = offsetof(struct run_as_data, u.mkdir.dirfd), |
93bed9fe | 236 | .out_fds_offset = -1, |
a6bc4ca9 | 237 | .in_fd_count = 1, |
93bed9fe JG |
238 | .out_fd_count = 0, |
239 | .use_cwd_fd = false, | |
240 | }, | |
a6bc4ca9 | 241 | { |
93bed9fe | 242 | .in_fds_offset = offsetof(struct run_as_data, u.open.dirfd), |
93bed9fe | 243 | .out_fds_offset = offsetof(struct run_as_ret, u.open.fd), |
a6bc4ca9 | 244 | .in_fd_count = 1, |
93bed9fe JG |
245 | .out_fd_count = 1, |
246 | .use_cwd_fd = true, | |
247 | }, | |
a6bc4ca9 | 248 | { |
93bed9fe | 249 | .in_fds_offset = offsetof(struct run_as_data, u.open.dirfd), |
93bed9fe | 250 | .out_fds_offset = offsetof(struct run_as_ret, u.open.fd), |
a6bc4ca9 | 251 | .in_fd_count = 1, |
93bed9fe JG |
252 | .out_fd_count = 1, |
253 | .use_cwd_fd = false, | |
254 | }, | |
a6bc4ca9 | 255 | { |
93bed9fe | 256 | .in_fds_offset = offsetof(struct run_as_data, u.unlink.dirfd), |
93bed9fe | 257 | .out_fds_offset = -1, |
a6bc4ca9 | 258 | .in_fd_count = 1, |
93bed9fe JG |
259 | .out_fd_count = 0, |
260 | .use_cwd_fd = true, | |
261 | }, | |
a6bc4ca9 | 262 | { |
93bed9fe | 263 | .in_fds_offset = offsetof(struct run_as_data, u.unlink.dirfd), |
93bed9fe | 264 | .out_fds_offset = -1, |
a6bc4ca9 | 265 | .in_fd_count = 1, |
93bed9fe JG |
266 | .out_fd_count = 0, |
267 | .use_cwd_fd = false, | |
268 | }, | |
a6bc4ca9 | 269 | { |
93bed9fe | 270 | .in_fds_offset = offsetof(struct run_as_data, u.rmdir.dirfd), |
93bed9fe | 271 | .out_fds_offset = -1, |
a6bc4ca9 | 272 | .in_fd_count = 1, |
93bed9fe JG |
273 | .out_fd_count = 0, |
274 | .use_cwd_fd = true, | |
275 | }, | |
a6bc4ca9 | 276 | { |
93bed9fe | 277 | .in_fds_offset = offsetof(struct run_as_data, u.rmdir.dirfd), |
93bed9fe | 278 | .out_fds_offset = -1, |
a6bc4ca9 | 279 | .in_fd_count = 1, |
93bed9fe JG |
280 | .out_fd_count = 0, |
281 | .use_cwd_fd = false, | |
282 | }, | |
a6bc4ca9 | 283 | { |
93bed9fe | 284 | .in_fds_offset = offsetof(struct run_as_data, u.rmdir.dirfd), |
93bed9fe | 285 | .out_fds_offset = -1, |
a6bc4ca9 | 286 | .in_fd_count = 1, |
93bed9fe JG |
287 | .out_fd_count = 0, |
288 | .use_cwd_fd = true, | |
289 | }, | |
a6bc4ca9 | 290 | { |
93bed9fe | 291 | .in_fds_offset = offsetof(struct run_as_data, u.rmdir.dirfd), |
93bed9fe | 292 | .out_fds_offset = -1, |
a6bc4ca9 | 293 | .in_fd_count = 1, |
93bed9fe JG |
294 | .out_fd_count = 0, |
295 | .use_cwd_fd = false, | |
296 | }, | |
a6bc4ca9 | 297 | { |
93bed9fe | 298 | .in_fds_offset = offsetof(struct run_as_data, u.rename.dirfds), |
93bed9fe | 299 | .out_fds_offset = -1, |
a6bc4ca9 | 300 | .in_fd_count = 2, |
93bed9fe JG |
301 | .out_fd_count = 0, |
302 | .use_cwd_fd = true, | |
303 | }, | |
a6bc4ca9 | 304 | { |
93bed9fe | 305 | .in_fds_offset = offsetof(struct run_as_data, u.rename.dirfds), |
93bed9fe | 306 | .out_fds_offset = -1, |
a6bc4ca9 | 307 | .in_fd_count = 2, |
93bed9fe JG |
308 | .out_fd_count = 0, |
309 | .use_cwd_fd = false, | |
310 | }, | |
a6bc4ca9 | 311 | { |
28ab034a | 312 | .in_fds_offset = offsetof(struct run_as_data, u.extract_elf_symbol_offset.fd), |
93bed9fe | 313 | .out_fds_offset = -1, |
a6bc4ca9 | 314 | .in_fd_count = 1, |
93bed9fe JG |
315 | .out_fd_count = 0, |
316 | .use_cwd_fd = false, | |
317 | }, | |
a6bc4ca9 | 318 | { |
28ab034a | 319 | .in_fds_offset = offsetof(struct run_as_data, u.extract_sdt_probe_offsets.fd), |
93bed9fe | 320 | .out_fds_offset = -1, |
a6bc4ca9 | 321 | .in_fd_count = 1, |
93bed9fe JG |
322 | .out_fd_count = 0, |
323 | .use_cwd_fd = false, | |
324 | }, | |
a6bc4ca9 | 325 | { |
c73f064a | 326 | .in_fds_offset = -1, |
c73f064a | 327 | .out_fds_offset = -1, |
a6bc4ca9 | 328 | .in_fd_count = 0, |
c73f064a JR |
329 | .out_fd_count = 0, |
330 | .use_cwd_fd = false, | |
331 | }, | |
df5b86c8 MD |
332 | }; |
333 | ||
a6bc4ca9 | 334 | struct run_as_worker_data { |
28ab034a | 335 | pid_t pid; /* Worker PID. */ |
7567352f MD |
336 | int sockpair[2]; |
337 | char *procname; | |
338 | }; | |
339 | ||
340 | /* Single global worker per process (for now). */ | |
f1494934 | 341 | run_as_worker_data *global_worker; |
7567352f | 342 | /* Lock protecting the worker. */ |
f1494934 JG |
343 | pthread_mutex_t worker_lock = PTHREAD_MUTEX_INITIALIZER; |
344 | } /* namespace */ | |
7567352f | 345 | |
8f0044bf | 346 | #ifdef VALGRIND |
28ab034a | 347 | static int use_clone(void) |
8f0044bf MD |
348 | { |
349 | return 0; | |
350 | } | |
351 | #else | |
28ab034a | 352 | static int use_clone(void) |
8f0044bf | 353 | { |
e8fa9fb0 | 354 | return !lttng_secure_getenv("LTTNG_DEBUG_NOCLONE"); |
8f0044bf MD |
355 | } |
356 | #endif | |
357 | ||
60b6c79c MD |
358 | /* |
359 | * Create recursively directory using the FULL path. | |
360 | */ | |
28ab034a | 361 | static int _mkdirat_recursive(struct run_as_data *data, struct run_as_ret *ret_value) |
60b6c79c | 362 | { |
60b6c79c | 363 | const char *path; |
60b6c79c | 364 | mode_t mode; |
cbf53d23 | 365 | struct lttng_directory_handle *handle; |
60b6c79c | 366 | |
93bed9fe JG |
367 | path = data->u.mkdir.path; |
368 | mode = data->u.mkdir.mode; | |
60b6c79c | 369 | |
cbf53d23 JG |
370 | handle = lttng_directory_handle_create_from_dirfd(data->u.mkdir.dirfd); |
371 | if (!handle) { | |
372 | ret_value->_errno = errno; | |
373 | ret_value->_error = true; | |
374 | ret_value->u.ret = -1; | |
375 | goto end; | |
376 | } | |
87bbb856 | 377 | /* Ownership of dirfd is transferred to the handle. */ |
93bed9fe | 378 | data->u.mkdir.dirfd = -1; |
d77dded2 | 379 | /* Safe to call as we have transitioned to the requested uid/gid. */ |
28ab034a | 380 | ret_value->u.ret = lttng_directory_handle_create_subdirectory_recursive(handle, path, mode); |
fe9f7760 | 381 | ret_value->_errno = errno; |
93bed9fe | 382 | ret_value->_error = (ret_value->u.ret) ? true : false; |
cbf53d23 JG |
383 | lttng_directory_handle_put(handle); |
384 | end: | |
93bed9fe | 385 | return ret_value->u.ret; |
60b6c79c MD |
386 | } |
387 | ||
28ab034a | 388 | static int _mkdirat(struct run_as_data *data, struct run_as_ret *ret_value) |
60b6c79c | 389 | { |
18710679 JG |
390 | const char *path; |
391 | mode_t mode; | |
cbf53d23 | 392 | struct lttng_directory_handle *handle; |
18710679 | 393 | |
93bed9fe JG |
394 | path = data->u.mkdir.path; |
395 | mode = data->u.mkdir.mode; | |
18710679 | 396 | |
cbf53d23 JG |
397 | handle = lttng_directory_handle_create_from_dirfd(data->u.mkdir.dirfd); |
398 | if (!handle) { | |
399 | ret_value->u.ret = -1; | |
400 | ret_value->_errno = errno; | |
401 | ret_value->_error = true; | |
402 | goto end; | |
403 | } | |
87bbb856 | 404 | /* Ownership of dirfd is transferred to the handle. */ |
93bed9fe | 405 | data->u.mkdir.dirfd = -1; |
18710679 | 406 | /* Safe to call as we have transitioned to the requested uid/gid. */ |
28ab034a | 407 | ret_value->u.ret = lttng_directory_handle_create_subdirectory(handle, path, mode); |
fe9f7760 | 408 | ret_value->_errno = errno; |
93bed9fe | 409 | ret_value->_error = (ret_value->u.ret) ? true : false; |
cbf53d23 JG |
410 | lttng_directory_handle_put(handle); |
411 | end: | |
93bed9fe | 412 | return ret_value->u.ret; |
7567352f | 413 | } |
7ce36756 | 414 | |
28ab034a | 415 | static int _open(struct run_as_data *data, struct run_as_ret *ret_value) |
7567352f | 416 | { |
93bed9fe | 417 | int fd; |
cbf53d23 | 418 | struct lttng_directory_handle *handle; |
93bed9fe | 419 | |
cbf53d23 JG |
420 | handle = lttng_directory_handle_create_from_dirfd(data->u.open.dirfd); |
421 | if (!handle) { | |
422 | ret_value->_errno = errno; | |
423 | ret_value->_error = true; | |
424 | ret_value->u.ret = -1; | |
425 | goto end; | |
426 | } | |
93bed9fe JG |
427 | /* Ownership of dirfd is transferred to the handle. */ |
428 | data->u.open.dirfd = -1; | |
429 | ||
28ab034a JG |
430 | fd = lttng_directory_handle_open_file( |
431 | handle, data->u.open.path, data->u.open.flags, data->u.open.mode); | |
93bed9fe JG |
432 | if (fd < 0) { |
433 | ret_value->u.ret = -1; | |
434 | ret_value->u.open.fd = -1; | |
435 | } else { | |
436 | ret_value->u.ret = 0; | |
437 | ret_value->u.open.fd = fd; | |
438 | } | |
439 | ||
fe9f7760 | 440 | ret_value->_errno = errno; |
93bed9fe | 441 | ret_value->_error = fd < 0; |
cbf53d23 JG |
442 | lttng_directory_handle_put(handle); |
443 | end: | |
93bed9fe | 444 | return ret_value->u.ret; |
7567352f MD |
445 | } |
446 | ||
28ab034a | 447 | static int _unlink(struct run_as_data *data, struct run_as_ret *ret_value) |
7567352f | 448 | { |
cbf53d23 | 449 | struct lttng_directory_handle *handle; |
93bed9fe | 450 | |
cbf53d23 JG |
451 | handle = lttng_directory_handle_create_from_dirfd(data->u.unlink.dirfd); |
452 | if (!handle) { | |
453 | ret_value->u.ret = -1; | |
454 | ret_value->_errno = errno; | |
455 | ret_value->_error = true; | |
456 | goto end; | |
457 | } | |
93bed9fe JG |
458 | |
459 | /* Ownership of dirfd is transferred to the handle. */ | |
460 | data->u.unlink.dirfd = -1; | |
461 | ||
28ab034a | 462 | ret_value->u.ret = lttng_directory_handle_unlink_file(handle, data->u.unlink.path); |
93bed9fe JG |
463 | ret_value->_errno = errno; |
464 | ret_value->_error = (ret_value->u.ret) ? true : false; | |
cbf53d23 JG |
465 | lttng_directory_handle_put(handle); |
466 | end: | |
93bed9fe JG |
467 | return ret_value->u.ret; |
468 | } | |
469 | ||
28ab034a | 470 | static int _rmdir(struct run_as_data *data, struct run_as_ret *ret_value) |
93bed9fe | 471 | { |
cbf53d23 | 472 | struct lttng_directory_handle *handle; |
93bed9fe | 473 | |
cbf53d23 JG |
474 | handle = lttng_directory_handle_create_from_dirfd(data->u.rmdir.dirfd); |
475 | if (!handle) { | |
476 | ret_value->u.ret = -1; | |
477 | ret_value->_errno = errno; | |
478 | ret_value->_error = true; | |
479 | goto end; | |
480 | } | |
93bed9fe JG |
481 | |
482 | /* Ownership of dirfd is transferred to the handle. */ | |
483 | data->u.rmdir.dirfd = -1; | |
484 | ||
28ab034a | 485 | ret_value->u.ret = lttng_directory_handle_remove_subdirectory(handle, data->u.rmdir.path); |
fe9f7760 | 486 | ret_value->_errno = errno; |
93bed9fe | 487 | ret_value->_error = (ret_value->u.ret) ? true : false; |
cbf53d23 JG |
488 | lttng_directory_handle_put(handle); |
489 | end: | |
93bed9fe | 490 | return ret_value->u.ret; |
60b6c79c MD |
491 | } |
492 | ||
28ab034a | 493 | static int _rmdir_recursive(struct run_as_data *data, struct run_as_ret *ret_value) |
60b6c79c | 494 | { |
cbf53d23 | 495 | struct lttng_directory_handle *handle; |
93bed9fe | 496 | |
cbf53d23 JG |
497 | handle = lttng_directory_handle_create_from_dirfd(data->u.rmdir.dirfd); |
498 | if (!handle) { | |
499 | ret_value->u.ret = -1; | |
500 | ret_value->_errno = errno; | |
501 | ret_value->_error = true; | |
502 | goto end; | |
503 | } | |
93bed9fe JG |
504 | |
505 | /* Ownership of dirfd is transferred to the handle. */ | |
506 | data->u.rmdir.dirfd = -1; | |
507 | ||
508 | ret_value->u.ret = lttng_directory_handle_remove_subdirectory_recursive( | |
28ab034a | 509 | handle, data->u.rmdir.path, data->u.rmdir.flags); |
fe9f7760 | 510 | ret_value->_errno = errno; |
93bed9fe | 511 | ret_value->_error = (ret_value->u.ret) ? true : false; |
cbf53d23 JG |
512 | lttng_directory_handle_put(handle); |
513 | end: | |
93bed9fe JG |
514 | return ret_value->u.ret; |
515 | } | |
516 | ||
28ab034a | 517 | static int _rename(struct run_as_data *data, struct run_as_ret *ret_value) |
93bed9fe JG |
518 | { |
519 | const char *old_path, *new_path; | |
cbf53d23 | 520 | struct lttng_directory_handle *old_handle = NULL, *new_handle = NULL; |
93bed9fe JG |
521 | |
522 | old_path = data->u.rename.old_path; | |
523 | new_path = data->u.rename.new_path; | |
524 | ||
28ab034a | 525 | old_handle = lttng_directory_handle_create_from_dirfd(data->u.rename.dirfds[0]); |
cbf53d23 JG |
526 | if (!old_handle) { |
527 | ret_value->u.ret = -1; | |
528 | goto end; | |
529 | } | |
28ab034a | 530 | new_handle = lttng_directory_handle_create_from_dirfd(data->u.rename.dirfds[1]); |
cbf53d23 JG |
531 | if (!new_handle) { |
532 | ret_value->u.ret = -1; | |
533 | goto end; | |
534 | } | |
93bed9fe JG |
535 | |
536 | /* Ownership of dirfds are transferred to the handles. */ | |
537 | data->u.rename.dirfds[0] = data->u.rename.dirfds[1] = -1; | |
538 | ||
539 | /* Safe to call as we have transitioned to the requested uid/gid. */ | |
28ab034a JG |
540 | ret_value->u.ret = |
541 | lttng_directory_handle_rename(old_handle, old_path, new_handle, new_path); | |
cbf53d23 JG |
542 | end: |
543 | lttng_directory_handle_put(old_handle); | |
544 | lttng_directory_handle_put(new_handle); | |
93bed9fe JG |
545 | ret_value->_errno = errno; |
546 | ret_value->_error = (ret_value->u.ret) ? true : false; | |
93bed9fe | 547 | return ret_value->u.ret; |
7567352f | 548 | } |
df5b86c8 | 549 | |
b1b34226 | 550 | #ifdef HAVE_ELF_H |
28ab034a | 551 | static int _extract_elf_symbol_offset(struct run_as_data *data, struct run_as_ret *ret_value) |
241e0a5a FD |
552 | { |
553 | int ret = 0; | |
65eefd4c | 554 | uint64_t offset; |
241e0a5a | 555 | |
93bed9fe JG |
556 | ret_value->_error = false; |
557 | ret = lttng_elf_get_symbol_offset(data->u.extract_elf_symbol_offset.fd, | |
28ab034a JG |
558 | data->u.extract_elf_symbol_offset.function, |
559 | &offset); | |
241e0a5a FD |
560 | if (ret) { |
561 | DBG("Failed to extract ELF function offset"); | |
562 | ret_value->_error = true; | |
563 | } | |
65eefd4c | 564 | ret_value->u.extract_elf_symbol_offset.offset = offset; |
241e0a5a FD |
565 | |
566 | return ret; | |
567 | } | |
568 | ||
28ab034a | 569 | static int _extract_sdt_probe_offsets(struct run_as_data *data, struct run_as_ret *ret_value) |
0ef03255 FD |
570 | { |
571 | int ret = 0; | |
572 | uint64_t *offsets = NULL; | |
573 | uint32_t num_offset; | |
574 | ||
575 | ret_value->_error = false; | |
576 | ||
577 | /* On success, this call allocates the offsets paramater. */ | |
28ab034a JG |
578 | ret = lttng_elf_get_sdt_probe_offsets(data->u.extract_sdt_probe_offsets.fd, |
579 | data->u.extract_sdt_probe_offsets.provider_name, | |
580 | data->u.extract_sdt_probe_offsets.probe_name, | |
581 | &offsets, | |
582 | &num_offset); | |
0ef03255 FD |
583 | |
584 | if (ret) { | |
585 | DBG("Failed to extract SDT probe offsets"); | |
586 | ret_value->_error = true; | |
587 | goto end; | |
588 | } | |
589 | ||
b8e2fb80 | 590 | if (num_offset <= 0 || num_offset > LTTNG_KERNEL_ABI_MAX_UPROBE_NUM) { |
0ef03255 FD |
591 | DBG("Wrong number of probes."); |
592 | ret = -1; | |
593 | ret_value->_error = true; | |
594 | goto free_offset; | |
595 | } | |
596 | ||
597 | /* Copy the content of the offsets array to the ret struct. */ | |
598 | memcpy(ret_value->u.extract_sdt_probe_offsets.offsets, | |
28ab034a JG |
599 | offsets, |
600 | num_offset * sizeof(uint64_t)); | |
0ef03255 FD |
601 | |
602 | ret_value->u.extract_sdt_probe_offsets.num_offset = num_offset; | |
603 | ||
604 | free_offset: | |
605 | free(offsets); | |
606 | end: | |
607 | return ret; | |
608 | } | |
b1b34226 | 609 | #else |
28ab034a JG |
610 | static int _extract_elf_symbol_offset(struct run_as_data *data __attribute__((unused)), |
611 | struct run_as_ret *ret_value __attribute__((unused))) | |
b1b34226 MJ |
612 | { |
613 | ERR("Unimplemented runas command RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET"); | |
614 | return -1; | |
615 | } | |
616 | ||
28ab034a JG |
617 | static int _extract_sdt_probe_offsets(struct run_as_data *data __attribute__((unused)), |
618 | struct run_as_ret *ret_value __attribute__((unused))) | |
b1b34226 MJ |
619 | { |
620 | ERR("Unimplemented runas command RUN_AS_EXTRACT_SDT_PROBE_OFFSETS"); | |
621 | return -1; | |
622 | } | |
623 | #endif | |
241e0a5a | 624 | |
28ab034a JG |
625 | static int _generate_filter_bytecode(struct run_as_data *data, struct run_as_ret *ret_value) |
626 | { | |
c73f064a JR |
627 | int ret = 0; |
628 | const char *filter_expression = NULL; | |
629 | struct filter_parser_ctx *ctx = NULL; | |
630 | ||
631 | ret_value->_error = false; | |
632 | ||
633 | filter_expression = data->u.generate_filter_bytecode.filter_expression; | |
634 | ||
28ab034a JG |
635 | if (lttng_strnlen(filter_expression, LTTNG_FILTER_MAX_LEN - 1) == |
636 | LTTNG_FILTER_MAX_LEN - 1) { | |
c73f064a JR |
637 | ret_value->_error = true; |
638 | ret = -1; | |
639 | goto end; | |
640 | } | |
641 | ||
642 | ret = filter_parser_ctx_create_from_filter_expression(filter_expression, &ctx); | |
643 | if (ret < 0) { | |
644 | ret_value->_error = true; | |
645 | ret = -1; | |
646 | goto end; | |
647 | } | |
648 | ||
28ab034a | 649 | DBG("Size of bytecode generated: %u bytes.", bytecode_get_len(&ctx->bytecode->b)); |
c73f064a JR |
650 | |
651 | /* Copy the lttng_bytecode_filter object to the return structure. */ | |
652 | memcpy(ret_value->u.generate_filter_bytecode.bytecode, | |
28ab034a JG |
653 | &ctx->bytecode->b, |
654 | sizeof(ctx->bytecode->b) + bytecode_get_len(&ctx->bytecode->b)); | |
c73f064a JR |
655 | |
656 | end: | |
657 | if (ctx) { | |
658 | filter_bytecode_free(ctx); | |
659 | filter_ir_free(ctx); | |
660 | filter_parser_ctx_free(ctx); | |
661 | } | |
662 | ||
663 | return ret; | |
664 | } | |
28ab034a | 665 | static run_as_fct run_as_enum_to_fct(enum run_as_cmd cmd) |
7567352f MD |
666 | { |
667 | switch (cmd) { | |
668 | case RUN_AS_MKDIR: | |
18710679 JG |
669 | case RUN_AS_MKDIRAT: |
670 | return _mkdirat; | |
671 | case RUN_AS_MKDIR_RECURSIVE: | |
672 | case RUN_AS_MKDIRAT_RECURSIVE: | |
673 | return _mkdirat_recursive; | |
7567352f | 674 | case RUN_AS_OPEN: |
2912cead | 675 | case RUN_AS_OPENAT: |
7567352f MD |
676 | return _open; |
677 | case RUN_AS_UNLINK: | |
2912cead | 678 | case RUN_AS_UNLINKAT: |
7567352f | 679 | return _unlink; |
93bed9fe JG |
680 | case RUN_AS_RMDIR: |
681 | case RUN_AS_RMDIRAT: | |
682 | return _rmdir; | |
7567352f | 683 | case RUN_AS_RMDIR_RECURSIVE: |
93bed9fe | 684 | case RUN_AS_RMDIRAT_RECURSIVE: |
7567352f | 685 | return _rmdir_recursive; |
93bed9fe JG |
686 | case RUN_AS_RENAME: |
687 | case RUN_AS_RENAMEAT: | |
688 | return _rename; | |
241e0a5a FD |
689 | case RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET: |
690 | return _extract_elf_symbol_offset; | |
0ef03255 FD |
691 | case RUN_AS_EXTRACT_SDT_PROBE_OFFSETS: |
692 | return _extract_sdt_probe_offsets; | |
c73f064a JR |
693 | case RUN_AS_GENERATE_FILTER_BYTECODE: |
694 | return _generate_filter_bytecode; | |
7567352f | 695 | default: |
62a7b8ed | 696 | ERR("Unknown command %d", (int) cmd); |
7567352f MD |
697 | return NULL; |
698 | } | |
60b6c79c MD |
699 | } |
700 | ||
28ab034a | 701 | static int do_send_fds(int sock, const int *fds, unsigned int fd_count) |
4628484a | 702 | { |
7567352f | 703 | ssize_t len; |
93bed9fe JG |
704 | unsigned int i; |
705 | ||
706 | for (i = 0; i < fd_count; i++) { | |
707 | if (fds[i] < 0) { | |
28ab034a | 708 | DBG("Attempt to send invalid file descriptor (fd = %i)", fds[i]); |
93bed9fe JG |
709 | /* Return 0 as this is not a fatal error. */ |
710 | return 0; | |
711 | } | |
4a76dfd3 | 712 | } |
4628484a | 713 | |
4a76dfd3 | 714 | len = lttcomm_send_fds_unix_sock(sock, fds, fd_count); |
93bed9fe | 715 | return len < 0 ? -1 : 0; |
4628484a MD |
716 | } |
717 | ||
28ab034a | 718 | static int do_recv_fds(int sock, int *fds, unsigned int fd_count) |
4628484a | 719 | { |
93bed9fe JG |
720 | int ret = 0; |
721 | unsigned int i; | |
7567352f | 722 | ssize_t len; |
4628484a | 723 | |
93bed9fe JG |
724 | len = lttcomm_recv_fds_unix_sock(sock, fds, fd_count); |
725 | if (len == 0) { | |
726 | ret = -1; | |
727 | goto end; | |
da9ee832 | 728 | } else if (len < 0) { |
93bed9fe JG |
729 | PERROR("Failed to receive file descriptors from socket"); |
730 | ret = -1; | |
731 | goto end; | |
ca9eb994 JG |
732 | } |
733 | ||
93bed9fe JG |
734 | for (i = 0; i < fd_count; i++) { |
735 | if (fds[i] < 0) { | |
736 | ERR("Invalid file descriptor received from worker (fd = %i)", fds[i]); | |
737 | /* Return 0 as this is not a fatal error. */ | |
738 | } | |
55cb0d6f | 739 | } |
93bed9fe | 740 | end: |
55cb0d6f | 741 | return ret; |
4628484a MD |
742 | } |
743 | ||
28ab034a | 744 | static int send_fds_to_worker(const run_as_worker_data *worker, const struct run_as_data *data) |
fe9f7760 FD |
745 | { |
746 | int ret = 0; | |
93bed9fe | 747 | unsigned int i; |
fe9f7760 | 748 | |
93bed9fe JG |
749 | if (COMMAND_USE_CWD_FD(data) || COMMAND_IN_FD_COUNT(data) == 0) { |
750 | goto end; | |
fe9f7760 FD |
751 | } |
752 | ||
93bed9fe JG |
753 | for (i = 0; i < COMMAND_IN_FD_COUNT(data); i++) { |
754 | if (COMMAND_IN_FDS(data)[i] < 0) { | |
755 | ERR("Refusing to send invalid fd to worker (fd = %i)", | |
28ab034a | 756 | COMMAND_IN_FDS(data)[i]); |
93bed9fe JG |
757 | ret = -1; |
758 | goto end; | |
759 | } | |
55cb0d6f | 760 | } |
ca9eb994 | 761 | |
28ab034a | 762 | ret = do_send_fds(worker->sockpair[0], COMMAND_IN_FDS(data), COMMAND_IN_FD_COUNT(data)); |
fe9f7760 | 763 | if (ret < 0) { |
93bed9fe | 764 | PERROR("Failed to send file descriptor to run-as worker"); |
fe9f7760 | 765 | ret = -1; |
93bed9fe | 766 | goto end; |
fe9f7760 | 767 | } |
93bed9fe | 768 | end: |
fe9f7760 FD |
769 | return ret; |
770 | } | |
771 | ||
28ab034a JG |
772 | static int |
773 | send_fds_to_master(run_as_worker_data *worker, enum run_as_cmd cmd, struct run_as_ret *run_as_ret) | |
fe9f7760 | 774 | { |
93bed9fe JG |
775 | int ret = 0; |
776 | unsigned int i; | |
fe9f7760 | 777 | |
93bed9fe JG |
778 | if (COMMAND_OUT_FD_COUNT(cmd) == 0) { |
779 | goto end; | |
fe9f7760 FD |
780 | } |
781 | ||
28ab034a JG |
782 | ret = do_send_fds( |
783 | worker->sockpair[1], COMMAND_OUT_FDS(cmd, run_as_ret), COMMAND_OUT_FD_COUNT(cmd)); | |
fe9f7760 | 784 | if (ret < 0) { |
93bed9fe JG |
785 | PERROR("Failed to send file descriptor to master process"); |
786 | goto end; | |
fe9f7760 FD |
787 | } |
788 | ||
93bed9fe | 789 | for (i = 0; i < COMMAND_OUT_FD_COUNT(cmd); i++) { |
a4c64187 FD |
790 | int fd = COMMAND_OUT_FDS(cmd, run_as_ret)[i]; |
791 | if (fd >= 0) { | |
792 | int ret_close = close(fd); | |
793 | ||
794 | if (ret_close < 0) { | |
28ab034a | 795 | PERROR("Failed to close result file descriptor (fd = %i)", fd); |
a4c64187 | 796 | } |
93bed9fe JG |
797 | } |
798 | } | |
799 | end: | |
fe9f7760 FD |
800 | return ret; |
801 | } | |
802 | ||
28ab034a JG |
803 | static int recv_fds_from_worker(const run_as_worker_data *worker, |
804 | enum run_as_cmd cmd, | |
805 | struct run_as_ret *run_as_ret) | |
fe9f7760 FD |
806 | { |
807 | int ret = 0; | |
808 | ||
93bed9fe JG |
809 | if (COMMAND_OUT_FD_COUNT(cmd) == 0) { |
810 | goto end; | |
fe9f7760 FD |
811 | } |
812 | ||
28ab034a JG |
813 | ret = do_recv_fds( |
814 | worker->sockpair[0], COMMAND_OUT_FDS(cmd, run_as_ret), COMMAND_OUT_FD_COUNT(cmd)); | |
fe9f7760 | 815 | if (ret < 0) { |
93bed9fe | 816 | PERROR("Failed to receive file descriptor from run-as worker"); |
fe9f7760 FD |
817 | ret = -1; |
818 | } | |
93bed9fe | 819 | end: |
fe9f7760 FD |
820 | return ret; |
821 | } | |
822 | ||
28ab034a | 823 | static int recv_fds_from_master(run_as_worker_data *worker, struct run_as_data *data) |
fe9f7760 FD |
824 | { |
825 | int ret = 0; | |
826 | ||
93bed9fe JG |
827 | if (COMMAND_USE_CWD_FD(data)) { |
828 | unsigned int i; | |
829 | ||
830 | for (i = 0; i < COMMAND_IN_FD_COUNT(data); i++) { | |
831 | COMMAND_IN_FDS(data)[i] = AT_FDCWD; | |
832 | } | |
833 | goto end; | |
fe9f7760 FD |
834 | } |
835 | ||
c73f064a JR |
836 | if (COMMAND_IN_FD_COUNT(data) == 0) { |
837 | goto end; | |
838 | } | |
839 | ||
28ab034a | 840 | ret = do_recv_fds(worker->sockpair[1], COMMAND_IN_FDS(data), COMMAND_IN_FD_COUNT(data)); |
fe9f7760 | 841 | if (ret < 0) { |
93bed9fe | 842 | PERROR("Failed to receive file descriptors from master process"); |
fe9f7760 FD |
843 | ret = -1; |
844 | } | |
93bed9fe | 845 | end: |
fe9f7760 FD |
846 | return ret; |
847 | } | |
848 | ||
28ab034a | 849 | static int cleanup_received_fds(struct run_as_data *data) |
fe9f7760 | 850 | { |
93bed9fe | 851 | int ret = 0, i; |
fe9f7760 | 852 | |
93bed9fe JG |
853 | for (i = 0; i < COMMAND_IN_FD_COUNT(data); i++) { |
854 | if (COMMAND_IN_FDS(data)[i] == -1) { | |
855 | continue; | |
856 | } | |
857 | ret = close(COMMAND_IN_FDS(data)[i]); | |
858 | if (ret) { | |
859 | PERROR("Failed to close file descriptor received fd in run-as worker"); | |
860 | goto end; | |
861 | } | |
fe9f7760 | 862 | } |
93bed9fe | 863 | end: |
fe9f7760 FD |
864 | return ret; |
865 | } | |
0ef03255 | 866 | |
28ab034a | 867 | static int get_user_infos_from_uid(uid_t uid, char **username, gid_t *primary_gid) |
37ccf8ec FD |
868 | { |
869 | int ret; | |
870 | char *buf = NULL; | |
222b6734 FD |
871 | long raw_get_pw_buf_size; |
872 | size_t get_pw_buf_size; | |
37ccf8ec FD |
873 | struct passwd pwd; |
874 | struct passwd *result = NULL; | |
875 | ||
876 | /* Fetch the max size for the temporary buffer. */ | |
877 | errno = 0; | |
222b6734 FD |
878 | raw_get_pw_buf_size = sysconf(_SC_GETPW_R_SIZE_MAX); |
879 | if (raw_get_pw_buf_size < 0) { | |
37ccf8ec FD |
880 | if (errno != 0) { |
881 | PERROR("Failed to query _SC_GETPW_R_SIZE_MAX"); | |
882 | goto error; | |
883 | } | |
884 | ||
885 | /* Limit is indeterminate. */ | |
886 | WARN("Failed to query _SC_GETPW_R_SIZE_MAX as it is " | |
28ab034a | 887 | "indeterminate; falling back to default buffer size"); |
222b6734 | 888 | raw_get_pw_buf_size = GETPW_BUFFER_FALLBACK_SIZE; |
37ccf8ec FD |
889 | } |
890 | ||
222b6734 FD |
891 | get_pw_buf_size = (size_t) raw_get_pw_buf_size; |
892 | ||
64803277 | 893 | buf = calloc<char>(get_pw_buf_size); |
37ccf8ec FD |
894 | if (buf == NULL) { |
895 | PERROR("Failed to allocate buffer to get password file entries"); | |
896 | goto error; | |
897 | } | |
898 | ||
222b6734 | 899 | ret = getpwuid_r(uid, &pwd, buf, get_pw_buf_size, &result); |
37ccf8ec | 900 | if (ret < 0) { |
28ab034a | 901 | PERROR("Failed to get user information for user: uid = %d", (int) uid); |
37ccf8ec FD |
902 | goto error; |
903 | } | |
904 | ||
905 | if (result == NULL) { | |
28ab034a | 906 | ERR("Failed to find user information in password entries: uid = %d", (int) uid); |
37ccf8ec FD |
907 | ret = -1; |
908 | goto error; | |
909 | } | |
910 | ||
911 | *username = strdup(result->pw_name); | |
912 | if (*username == NULL) { | |
913 | PERROR("Failed to copy user name"); | |
914 | goto error; | |
915 | } | |
916 | ||
917 | *primary_gid = result->pw_gid; | |
918 | ||
919 | end: | |
920 | free(buf); | |
921 | return ret; | |
922 | error: | |
923 | *username = NULL; | |
924 | *primary_gid = -1; | |
925 | ret = -1; | |
926 | goto end; | |
927 | } | |
928 | ||
28ab034a | 929 | static int demote_creds(uid_t prev_uid, gid_t prev_gid, uid_t new_uid, gid_t new_gid) |
37ccf8ec FD |
930 | { |
931 | int ret = 0; | |
932 | gid_t primary_gid; | |
933 | char *username = NULL; | |
934 | ||
935 | /* Change the group id. */ | |
936 | if (prev_gid != new_gid) { | |
937 | ret = setegid(new_gid); | |
938 | if (ret < 0) { | |
28ab034a | 939 | PERROR("Failed to set effective group id: new_gid = %d", (int) new_gid); |
37ccf8ec FD |
940 | goto end; |
941 | } | |
942 | } | |
943 | ||
944 | /* Change the user id. */ | |
945 | if (prev_uid != new_uid) { | |
946 | ret = get_user_infos_from_uid(new_uid, &username, &primary_gid); | |
947 | if (ret < 0) { | |
948 | goto end; | |
949 | } | |
950 | ||
951 | /* | |
952 | * Initialize the supplementary group access list. | |
953 | * | |
954 | * This is needed to handle cases where the supplementary groups | |
955 | * of the user the process is demoting-to would give it access | |
956 | * to a given file/folder, but not it's primary group. | |
957 | * | |
958 | * e.g | |
959 | * username: User1 | |
960 | * Primary Group: User1 | |
961 | * Secondary group: Disk, Network | |
962 | * | |
963 | * mkdir inside the following directory must work since User1 | |
964 | * is part of the Network group. | |
965 | * | |
966 | * drwxrwx--- 2 root Network 4096 Jul 23 17:17 /tmp/my_folder/ | |
967 | * | |
968 | * | |
969 | * The order of the following initgroups and seteuid calls is | |
970 | * important here; | |
971 | * Only a root process or one with CAP_SETGID capability can | |
972 | * call the the initgroups() function. We must initialize the | |
973 | * supplementary groups before we change the effective | |
974 | * UID to a less-privileged user. | |
975 | */ | |
976 | ret = initgroups(username, primary_gid); | |
977 | if (ret < 0) { | |
978 | PERROR("Failed to init the supplementary group access list: " | |
28ab034a JG |
979 | "username = `%s`, primary gid = %d", |
980 | username, | |
981 | (int) primary_gid); | |
37ccf8ec FD |
982 | goto end; |
983 | } | |
984 | ||
985 | ret = seteuid(new_uid); | |
986 | if (ret < 0) { | |
28ab034a | 987 | PERROR("Failed to set effective user id: new_uid = %d", (int) new_uid); |
37ccf8ec FD |
988 | goto end; |
989 | } | |
990 | } | |
991 | end: | |
992 | free(username); | |
993 | return ret; | |
994 | } | |
995 | ||
28ab034a | 996 | static int promote_creds(uid_t prev_uid, gid_t prev_gid, uid_t new_uid, gid_t new_gid) |
37ccf8ec FD |
997 | { |
998 | int ret = 0; | |
999 | gid_t primary_gid; | |
1000 | char *username = NULL; | |
1001 | ||
1002 | /* Change the group id. */ | |
1003 | if (prev_gid != new_gid) { | |
1004 | ret = setegid(new_gid); | |
1005 | if (ret < 0) { | |
28ab034a | 1006 | PERROR("Failed to set effective group id: new_gid = %d", (int) new_gid); |
37ccf8ec FD |
1007 | goto end; |
1008 | } | |
1009 | } | |
1010 | ||
1011 | /* Change the user id. */ | |
1012 | if (prev_uid != new_uid) { | |
1013 | ret = get_user_infos_from_uid(new_uid, &username, &primary_gid); | |
1014 | if (ret < 0) { | |
1015 | goto end; | |
1016 | } | |
1017 | ||
1018 | /* | |
1019 | * seteuid call must be done before the initgroups call because | |
1020 | * we need to be privileged (CAP_SETGID) to call initgroups(). | |
1021 | */ | |
1022 | ret = seteuid(new_uid); | |
1023 | if (ret < 0) { | |
28ab034a | 1024 | PERROR("Failed to set effective user id: new_uid = %d", (int) new_uid); |
37ccf8ec FD |
1025 | goto end; |
1026 | } | |
1027 | ||
1028 | /* | |
1029 | * Initialize the supplementary group access list. | |
1030 | * | |
1031 | * There is a possibility the groups we set in the following | |
1032 | * initgroups() call are not exactly the same as the ones we | |
1033 | * had when we originally demoted. This can happen if the | |
1034 | * /etc/group file is modified after the runas process is | |
1035 | * forked. This is very unlikely. | |
1036 | */ | |
1037 | ret = initgroups(username, primary_gid); | |
1038 | if (ret < 0) { | |
1039 | PERROR("Failed to init the supplementary group access " | |
28ab034a JG |
1040 | "list: username = `%s`, primary gid = %d", |
1041 | username, | |
1042 | (int) primary_gid) | |
37ccf8ec FD |
1043 | goto end; |
1044 | } | |
1045 | } | |
1046 | end: | |
1047 | free(username); | |
1048 | return ret; | |
1049 | } | |
1050 | ||
7567352f MD |
1051 | /* |
1052 | * Return < 0 on error, 0 if OK, 1 on hangup. | |
1053 | */ | |
28ab034a | 1054 | static int handle_one_cmd(run_as_worker_data *worker) |
c2b75c49 | 1055 | { |
37ccf8ec | 1056 | int ret = 0, promote_ret; |
55cb0d6f JG |
1057 | struct run_as_data data = {}; |
1058 | ssize_t readlen, writelen; | |
1059 | struct run_as_ret sendret = {}; | |
1060 | run_as_fct cmd; | |
45d6ecaa JG |
1061 | const uid_t prev_ruid = getuid(); |
1062 | const gid_t prev_rgid = getgid(); | |
7567352f | 1063 | |
fe9f7760 FD |
1064 | /* |
1065 | * Stage 1: Receive run_as_data struct from the master. | |
1066 | * The structure contains the command type and all the parameters needed for | |
1067 | * its execution | |
1068 | */ | |
28ab034a | 1069 | readlen = lttcomm_recv_unix_sock(worker->sockpair[1], &data, sizeof(data)); |
7567352f MD |
1070 | if (readlen == 0) { |
1071 | /* hang up */ | |
1072 | ret = 1; | |
1073 | goto end; | |
1074 | } | |
1075 | if (readlen < sizeof(data)) { | |
1076 | PERROR("lttcomm_recv_unix_sock error"); | |
1077 | ret = -1; | |
1078 | goto end; | |
1079 | } | |
c2b75c49 | 1080 | |
7567352f MD |
1081 | cmd = run_as_enum_to_fct(data.cmd); |
1082 | if (!cmd) { | |
1083 | ret = -1; | |
1084 | goto end; | |
1085 | } | |
1086 | ||
fe9f7760 FD |
1087 | /* |
1088 | * Stage 2: Receive file descriptor from master. | |
1089 | * Some commands need a file descriptor as input so if it's needed we | |
1090 | * receive the fd using the Unix socket. | |
1091 | */ | |
93bed9fe | 1092 | ret = recv_fds_from_master(worker, &data); |
fe9f7760 FD |
1093 | if (ret < 0) { |
1094 | PERROR("recv_fd_from_master error"); | |
1095 | ret = -1; | |
1096 | goto end; | |
1097 | } | |
1098 | ||
37ccf8ec FD |
1099 | ret = demote_creds(prev_ruid, prev_rgid, data.uid, data.gid); |
1100 | if (ret < 0) { | |
1101 | goto write_return; | |
c2b75c49 | 1102 | } |
fe9f7760 | 1103 | |
c2b75c49 MD |
1104 | /* |
1105 | * Also set umask to 0 for mkdir executable bit. | |
1106 | */ | |
1107 | umask(0); | |
fe9f7760 FD |
1108 | |
1109 | /* | |
1110 | * Stage 3: Execute the command | |
1111 | */ | |
1112 | ret = (*cmd)(&data, &sendret); | |
1113 | if (ret < 0) { | |
1114 | DBG("Execution of command returned an error"); | |
1115 | } | |
6d73c4ef MD |
1116 | |
1117 | write_return: | |
93bed9fe | 1118 | ret = cleanup_received_fds(&data); |
fe9f7760 FD |
1119 | if (ret < 0) { |
1120 | ERR("Error cleaning up FD"); | |
37ccf8ec | 1121 | goto promote_back; |
fe9f7760 FD |
1122 | } |
1123 | ||
1124 | /* | |
1125 | * Stage 4: Send run_as_ret structure to the master. | |
1126 | * This structure contain the return value of the command and the errno. | |
1127 | */ | |
28ab034a | 1128 | writelen = lttcomm_send_unix_sock(worker->sockpair[1], &sendret, sizeof(sendret)); |
6cd525e8 | 1129 | if (writelen < sizeof(sendret)) { |
7567352f MD |
1130 | PERROR("lttcomm_send_unix_sock error"); |
1131 | ret = -1; | |
37ccf8ec | 1132 | goto promote_back; |
7567352f | 1133 | } |
fe9f7760 FD |
1134 | |
1135 | /* | |
93bed9fe | 1136 | * Stage 5: Send resulting file descriptors to the master. |
fe9f7760 | 1137 | */ |
93bed9fe | 1138 | ret = send_fds_to_master(worker, data.cmd, &sendret); |
fe9f7760 FD |
1139 | if (ret < 0) { |
1140 | DBG("Sending FD to master returned an error"); | |
7567352f | 1141 | } |
fe9f7760 | 1142 | |
7567352f | 1143 | ret = 0; |
37ccf8ec FD |
1144 | |
1145 | promote_back: | |
1146 | /* Return to previous uid/gid. */ | |
1147 | promote_ret = promote_creds(data.uid, data.gid, prev_ruid, prev_rgid); | |
1148 | if (promote_ret < 0) { | |
1149 | ERR("Failed to promote back to the initial credentials"); | |
1150 | } | |
1151 | ||
7567352f MD |
1152 | end: |
1153 | return ret; | |
1154 | } | |
1155 | ||
28ab034a | 1156 | static int run_as_worker(run_as_worker_data *worker) |
7567352f MD |
1157 | { |
1158 | int ret; | |
1159 | ssize_t writelen; | |
1160 | struct run_as_ret sendret; | |
1161 | size_t proc_orig_len; | |
1162 | ||
1163 | /* | |
1164 | * Initialize worker. Set a different process cmdline. | |
1165 | */ | |
1166 | proc_orig_len = strlen(worker->procname); | |
1167 | memset(worker->procname, 0, proc_orig_len); | |
1168 | strncpy(worker->procname, DEFAULT_RUN_AS_WORKER_NAME, proc_orig_len); | |
1169 | ||
cb8d0d24 | 1170 | ret = lttng_thread_setname(DEFAULT_RUN_AS_WORKER_NAME); |
e1055edb | 1171 | if (ret && ret != -ENOSYS) { |
b8090274 | 1172 | /* Don't fail as this is not essential. */ |
cb8d0d24 | 1173 | DBG("Failed to set pthread name attribute"); |
6cd525e8 | 1174 | } |
7567352f | 1175 | |
fe9f7760 FD |
1176 | memset(&sendret, 0, sizeof(sendret)); |
1177 | ||
28ab034a | 1178 | writelen = lttcomm_send_unix_sock(worker->sockpair[1], &sendret, sizeof(sendret)); |
7567352f MD |
1179 | if (writelen < sizeof(sendret)) { |
1180 | PERROR("lttcomm_send_unix_sock error"); | |
1181 | ret = EXIT_FAILURE; | |
1182 | goto end; | |
1183 | } | |
1184 | ||
1185 | for (;;) { | |
1186 | ret = handle_one_cmd(worker); | |
1187 | if (ret < 0) { | |
1188 | ret = EXIT_FAILURE; | |
1189 | goto end; | |
1190 | } else if (ret > 0) { | |
1191 | break; | |
1192 | } else { | |
28ab034a | 1193 | continue; /* Next command. */ |
7567352f MD |
1194 | } |
1195 | } | |
1196 | ret = EXIT_SUCCESS; | |
1197 | end: | |
1198 | return ret; | |
c2b75c49 MD |
1199 | } |
1200 | ||
28ab034a JG |
1201 | static int run_as_cmd(run_as_worker_data *worker, |
1202 | enum run_as_cmd cmd, | |
1203 | struct run_as_data *data, | |
1204 | struct run_as_ret *ret_value, | |
1205 | uid_t uid, | |
1206 | gid_t gid) | |
60b6c79c | 1207 | { |
fe9f7760 | 1208 | int ret = 0; |
7567352f | 1209 | ssize_t readlen, writelen; |
60b6c79c MD |
1210 | |
1211 | /* | |
1212 | * If we are non-root, we can only deal with our own uid. | |
1213 | */ | |
1214 | if (geteuid() != 0) { | |
1215 | if (uid != geteuid()) { | |
fe9f7760 FD |
1216 | ret = -1; |
1217 | ret_value->_errno = EPERM; | |
60b6c79c | 1218 | ERR("Client (%d)/Server (%d) UID mismatch (and sessiond is not root)", |
28ab034a JG |
1219 | (int) uid, |
1220 | (int) geteuid()); | |
df5b86c8 | 1221 | goto end; |
60b6c79c | 1222 | } |
60b6c79c MD |
1223 | } |
1224 | ||
7567352f MD |
1225 | data->cmd = cmd; |
1226 | data->uid = uid; | |
1227 | data->gid = gid; | |
1228 | ||
fe9f7760 FD |
1229 | /* |
1230 | * Stage 1: Send the run_as_data struct to the worker process | |
1231 | */ | |
28ab034a | 1232 | writelen = lttcomm_send_unix_sock(worker->sockpair[0], data, sizeof(*data)); |
7567352f MD |
1233 | if (writelen < sizeof(*data)) { |
1234 | PERROR("Error writing message to run_as"); | |
fe9f7760 FD |
1235 | ret = -1; |
1236 | ret_value->_errno = EIO; | |
60b6c79c | 1237 | goto end; |
c2b75c49 | 1238 | } |
7567352f | 1239 | |
fe9f7760 FD |
1240 | /* |
1241 | * Stage 2: Send file descriptor to the worker process if needed | |
1242 | */ | |
93bed9fe | 1243 | ret = send_fds_to_worker(worker, data); |
fe9f7760 FD |
1244 | if (ret) { |
1245 | PERROR("do_send_fd error"); | |
1246 | ret = -1; | |
1247 | ret_value->_errno = EIO; | |
1248 | goto end; | |
1249 | } | |
1250 | ||
1251 | /* | |
1252 | * Stage 3: Wait for the execution of the command | |
1253 | */ | |
1254 | ||
1255 | /* | |
1256 | * Stage 4: Receive the run_as_ret struct containing the return value and | |
1257 | * errno | |
1258 | */ | |
28ab034a | 1259 | readlen = lttcomm_recv_unix_sock(worker->sockpair[0], ret_value, sizeof(*ret_value)); |
da9ee832 JG |
1260 | if (!readlen) { |
1261 | ERR("Run-as worker has hung-up during run_as_cmd"); | |
fe9f7760 FD |
1262 | ret = -1; |
1263 | ret_value->_errno = EIO; | |
da9ee832 | 1264 | goto end; |
fe9f7760 | 1265 | } else if (readlen < sizeof(*ret_value)) { |
7567352f | 1266 | PERROR("Error reading response from run_as"); |
fe9f7760 FD |
1267 | ret = -1; |
1268 | ret_value->_errno = errno; | |
033b58a7 | 1269 | goto end; |
6cd525e8 | 1270 | } |
fe9f7760 | 1271 | |
ca9eb994 JG |
1272 | if (ret_value->_error) { |
1273 | /* Skip stage 5 on error as there will be no fd to receive. */ | |
1274 | goto end; | |
1275 | } | |
1276 | ||
fe9f7760 FD |
1277 | /* |
1278 | * Stage 5: Receive file descriptor if needed | |
1279 | */ | |
93bed9fe | 1280 | ret = recv_fds_from_worker(worker, cmd, ret_value); |
fe9f7760 FD |
1281 | if (ret < 0) { |
1282 | ERR("Error receiving fd"); | |
1283 | ret = -1; | |
1284 | ret_value->_errno = EIO; | |
4c462e79 | 1285 | } |
7567352f | 1286 | |
60b6c79c | 1287 | end: |
fe9f7760 | 1288 | return ret; |
60b6c79c MD |
1289 | } |
1290 | ||
2d85a600 | 1291 | /* |
7567352f | 1292 | * This is for debugging ONLY and should not be considered secure. |
2d85a600 | 1293 | */ |
28ab034a JG |
1294 | static int run_as_noworker(enum run_as_cmd cmd, |
1295 | struct run_as_data *data, | |
1296 | struct run_as_ret *ret_value, | |
1297 | uid_t uid __attribute__((unused)), | |
1298 | gid_t gid __attribute__((unused))) | |
2d85a600 | 1299 | { |
df5b86c8 | 1300 | int ret, saved_errno; |
5b73926f | 1301 | mode_t old_mask; |
7567352f | 1302 | run_as_fct fct; |
5b73926f | 1303 | |
7567352f MD |
1304 | fct = run_as_enum_to_fct(cmd); |
1305 | if (!fct) { | |
1306 | errno = -ENOSYS; | |
1307 | ret = -1; | |
1308 | goto end; | |
1309 | } | |
5b73926f | 1310 | old_mask = umask(0); |
fe9f7760 FD |
1311 | ret = fct(data, ret_value); |
1312 | saved_errno = ret_value->_errno; | |
5b73926f | 1313 | umask(old_mask); |
df5b86c8 | 1314 | errno = saved_errno; |
7567352f | 1315 | end: |
5b73926f | 1316 | return ret; |
2d85a600 MD |
1317 | } |
1318 | ||
28ab034a | 1319 | static int reset_sighandler(void) |
8fec83ea JG |
1320 | { |
1321 | int sig; | |
1322 | ||
1323 | DBG("Resetting run_as worker signal handlers to default"); | |
1324 | for (sig = 1; sig <= 31; sig++) { | |
1325 | (void) signal(sig, SIG_DFL); | |
1326 | } | |
1327 | return 0; | |
1328 | } | |
1329 | ||
28ab034a | 1330 | static void worker_sighandler(int sig) |
8fec83ea JG |
1331 | { |
1332 | const char *signame; | |
1333 | ||
1334 | /* | |
1335 | * The worker will inherit its parent's signals since they are part of | |
1336 | * the same process group. However, in the case of SIGINT and SIGTERM, | |
1337 | * we want to give the worker a chance to teardown gracefully when its | |
1338 | * parent closes the command socket. | |
1339 | */ | |
1340 | switch (sig) { | |
1341 | case SIGINT: | |
1342 | signame = "SIGINT"; | |
1343 | break; | |
1344 | case SIGTERM: | |
1345 | signame = "SIGTERM"; | |
1346 | break; | |
1347 | default: | |
1348 | signame = NULL; | |
1349 | } | |
1350 | ||
1351 | if (signame) { | |
1352 | DBG("run_as worker received signal %s", signame); | |
1353 | } else { | |
1354 | DBG("run_as_worker received signal %d", sig); | |
1355 | } | |
1356 | } | |
1357 | ||
28ab034a | 1358 | static int set_worker_sighandlers(void) |
8fec83ea JG |
1359 | { |
1360 | int ret = 0; | |
1361 | sigset_t sigset; | |
1362 | struct sigaction sa; | |
1363 | ||
1364 | if ((ret = sigemptyset(&sigset)) < 0) { | |
1365 | PERROR("sigemptyset"); | |
1366 | goto end; | |
1367 | } | |
1368 | ||
1369 | sa.sa_handler = worker_sighandler; | |
1370 | sa.sa_mask = sigset; | |
1371 | sa.sa_flags = 0; | |
1372 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { | |
1373 | PERROR("sigaction SIGINT"); | |
1374 | goto end; | |
1375 | } | |
1376 | ||
1377 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
1378 | PERROR("sigaction SIGTERM"); | |
1379 | goto end; | |
1380 | } | |
1381 | ||
1382 | DBG("run_as signal handler set for SIGTERM and SIGINT"); | |
1383 | end: | |
1384 | return ret; | |
1385 | } | |
1386 | ||
28ab034a JG |
1387 | static int run_as_create_worker_no_lock(const char *procname, |
1388 | post_fork_cleanup_cb clean_up_func, | |
1389 | void *clean_up_user_data) | |
8fec83ea JG |
1390 | { |
1391 | pid_t pid; | |
1392 | int i, ret = 0; | |
1393 | ssize_t readlen; | |
1394 | struct run_as_ret recvret; | |
a6bc4ca9 | 1395 | run_as_worker_data *worker; |
8fec83ea | 1396 | |
a0377dfe | 1397 | LTTNG_ASSERT(!global_worker); |
8fec83ea JG |
1398 | if (!use_clone()) { |
1399 | /* | |
1400 | * Don't initialize a worker, all run_as tasks will be performed | |
1401 | * in the current process. | |
1402 | */ | |
1403 | ret = 0; | |
1404 | goto end; | |
1405 | } | |
64803277 | 1406 | worker = zmalloc<run_as_worker_data>(); |
8fec83ea JG |
1407 | if (!worker) { |
1408 | ret = -ENOMEM; | |
1409 | goto end; | |
1410 | } | |
1411 | worker->procname = strdup(procname); | |
1412 | if (!worker->procname) { | |
1413 | ret = -ENOMEM; | |
8c96eded | 1414 | goto error_procname_alloc; |
8fec83ea JG |
1415 | } |
1416 | /* Create unix socket. */ | |
1417 | if (lttcomm_create_anon_unix_socketpair(worker->sockpair) < 0) { | |
1418 | ret = -1; | |
1419 | goto error_sock; | |
1420 | } | |
1421 | ||
1422 | /* Fork worker. */ | |
1423 | pid = fork(); | |
1424 | if (pid < 0) { | |
1425 | PERROR("fork"); | |
1426 | ret = -1; | |
1427 | goto error_fork; | |
1428 | } else if (pid == 0) { | |
1429 | /* Child */ | |
1430 | ||
1431 | reset_sighandler(); | |
1432 | ||
1433 | set_worker_sighandlers(); | |
c989e0d4 FD |
1434 | |
1435 | logger_set_thread_name("Run-as worker", true); | |
1436 | ||
929f71ec JG |
1437 | if (clean_up_func) { |
1438 | if (clean_up_func(clean_up_user_data) < 0) { | |
1439 | ERR("Run-as post-fork clean-up failed, exiting."); | |
1440 | exit(EXIT_FAILURE); | |
1441 | } | |
1442 | } | |
8fec83ea JG |
1443 | |
1444 | /* Just close, no shutdown. */ | |
1445 | if (close(worker->sockpair[0])) { | |
1446 | PERROR("close"); | |
1447 | exit(EXIT_FAILURE); | |
1448 | } | |
1449 | ||
1450 | /* | |
1451 | * Close all FDs aside from STDIN, STDOUT, STDERR and sockpair[1] | |
1452 | * Sockpair[1] is used as a control channel with the master | |
1453 | */ | |
1454 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { | |
1455 | if (i != worker->sockpair[1]) { | |
1456 | (void) close(i); | |
1457 | } | |
1458 | } | |
1459 | ||
1460 | worker->sockpair[0] = -1; | |
1461 | ret = run_as_worker(worker); | |
1462 | if (lttcomm_close_unix_sock(worker->sockpair[1])) { | |
1463 | PERROR("close"); | |
1464 | ret = -1; | |
1465 | } | |
1466 | worker->sockpair[1] = -1; | |
55cb0d6f | 1467 | free(worker->procname); |
340cf672 | 1468 | free(worker); |
8fec83ea JG |
1469 | LOG(ret ? PRINT_ERR : PRINT_DBG, "run_as worker exiting (ret = %d)", ret); |
1470 | exit(ret ? EXIT_FAILURE : EXIT_SUCCESS); | |
1471 | } else { | |
1472 | /* Parent */ | |
1473 | ||
1474 | /* Just close, no shutdown. */ | |
1475 | if (close(worker->sockpair[1])) { | |
1476 | PERROR("close"); | |
1477 | ret = -1; | |
1478 | goto error_fork; | |
1479 | } | |
1480 | worker->sockpair[1] = -1; | |
1481 | worker->pid = pid; | |
1482 | /* Wait for worker to become ready. */ | |
28ab034a | 1483 | readlen = lttcomm_recv_unix_sock(worker->sockpair[0], &recvret, sizeof(recvret)); |
8fec83ea JG |
1484 | if (readlen < sizeof(recvret)) { |
1485 | ERR("readlen: %zd", readlen); | |
1486 | PERROR("Error reading response from run_as at creation"); | |
1487 | ret = -1; | |
1488 | goto error_fork; | |
1489 | } | |
1490 | global_worker = worker; | |
1491 | } | |
1492 | end: | |
1493 | return ret; | |
1494 | ||
1495 | /* Error handling. */ | |
1496 | error_fork: | |
1497 | for (i = 0; i < 2; i++) { | |
1498 | if (worker->sockpair[i] < 0) { | |
1499 | continue; | |
1500 | } | |
1501 | if (lttcomm_close_unix_sock(worker->sockpair[i])) { | |
1502 | PERROR("close"); | |
1503 | } | |
1504 | worker->sockpair[i] = -1; | |
1505 | } | |
1506 | error_sock: | |
8c96eded FD |
1507 | free(worker->procname); |
1508 | error_procname_alloc: | |
8fec83ea JG |
1509 | free(worker); |
1510 | return ret; | |
1511 | } | |
1512 | ||
28ab034a | 1513 | static void run_as_destroy_worker_no_lock(void) |
a01c682b | 1514 | { |
a6bc4ca9 | 1515 | run_as_worker_data *worker = global_worker; |
a01c682b JR |
1516 | |
1517 | DBG("Destroying run_as worker"); | |
1518 | if (!worker) { | |
1519 | return; | |
1520 | } | |
1521 | /* Close unix socket */ | |
1522 | DBG("Closing run_as worker socket"); | |
1523 | if (lttcomm_close_unix_sock(worker->sockpair[0])) { | |
1524 | PERROR("close"); | |
1525 | } | |
1526 | worker->sockpair[0] = -1; | |
1527 | /* Wait for worker. */ | |
1528 | for (;;) { | |
1529 | int status; | |
1530 | pid_t wait_ret; | |
1531 | ||
1532 | wait_ret = waitpid(worker->pid, &status, 0); | |
1533 | if (wait_ret < 0) { | |
1534 | if (errno == EINTR) { | |
1535 | continue; | |
1536 | } | |
1537 | PERROR("waitpid"); | |
1538 | break; | |
1539 | } | |
1540 | ||
1541 | if (WIFEXITED(status)) { | |
1542 | LOG(WEXITSTATUS(status) == 0 ? PRINT_DBG : PRINT_ERR, | |
28ab034a JG |
1543 | DEFAULT_RUN_AS_WORKER_NAME " terminated with status code %d", |
1544 | WEXITSTATUS(status)); | |
a01c682b JR |
1545 | break; |
1546 | } else if (WIFSIGNALED(status)) { | |
1547 | ERR(DEFAULT_RUN_AS_WORKER_NAME " was killed by signal %d", | |
28ab034a | 1548 | WTERMSIG(status)); |
a01c682b JR |
1549 | break; |
1550 | } | |
1551 | } | |
1552 | free(worker->procname); | |
1553 | free(worker); | |
1554 | global_worker = NULL; | |
1555 | } | |
1556 | ||
28ab034a | 1557 | static int run_as_restart_worker(run_as_worker_data *worker) |
2d85a600 | 1558 | { |
fe9f7760 FD |
1559 | int ret = 0; |
1560 | char *procname = NULL; | |
1561 | ||
1562 | procname = worker->procname; | |
1563 | ||
1564 | /* Close socket to run_as worker process and clean up the zombie process */ | |
a01c682b | 1565 | run_as_destroy_worker_no_lock(); |
fe9f7760 FD |
1566 | |
1567 | /* Create a new run_as worker process*/ | |
929f71ec | 1568 | ret = run_as_create_worker_no_lock(procname, NULL, NULL); |
28ab034a | 1569 | if (ret < 0) { |
fe9f7760 FD |
1570 | ERR("Restarting the worker process failed"); |
1571 | ret = -1; | |
1572 | goto err; | |
1573 | } | |
1574 | err: | |
1575 | return ret; | |
1576 | } | |
1577 | ||
28ab034a JG |
1578 | static int run_as(enum run_as_cmd cmd, |
1579 | struct run_as_data *data, | |
1580 | struct run_as_ret *ret_value, | |
1581 | uid_t uid, | |
1582 | gid_t gid) | |
fe9f7760 FD |
1583 | { |
1584 | int ret, saved_errno; | |
7567352f | 1585 | |
8fec83ea | 1586 | pthread_mutex_lock(&worker_lock); |
749b7a0c | 1587 | if (use_clone()) { |
7567352f | 1588 | DBG("Using run_as worker"); |
8fec83ea | 1589 | |
a0377dfe | 1590 | LTTNG_ASSERT(global_worker); |
749b7a0c | 1591 | |
fe9f7760 FD |
1592 | ret = run_as_cmd(global_worker, cmd, data, ret_value, uid, gid); |
1593 | saved_errno = ret_value->_errno; | |
1594 | ||
fe9f7760 FD |
1595 | /* |
1596 | * If the worker thread crashed the errno is set to EIO. we log | |
1597 | * the error and start a new worker process. | |
1598 | */ | |
1599 | if (ret == -1 && saved_errno == EIO) { | |
1600 | DBG("Socket closed unexpectedly... " | |
28ab034a | 1601 | "Restarting the worker process"); |
fe9f7760 | 1602 | ret = run_as_restart_worker(global_worker); |
fe9f7760 FD |
1603 | if (ret == -1) { |
1604 | ERR("Failed to restart worker process."); | |
1605 | goto err; | |
1606 | } | |
1607 | } | |
2d85a600 | 1608 | } else { |
7567352f | 1609 | DBG("Using run_as without worker"); |
fe9f7760 | 1610 | ret = run_as_noworker(cmd, data, ret_value, uid, gid); |
2d85a600 | 1611 | } |
fe9f7760 | 1612 | err: |
8fec83ea | 1613 | pthread_mutex_unlock(&worker_lock); |
7567352f | 1614 | return ret; |
2d85a600 MD |
1615 | } |
1616 | ||
e11d277b | 1617 | int run_as_mkdir_recursive(const char *path, mode_t mode, uid_t uid, gid_t gid) |
60b6c79c | 1618 | { |
18710679 JG |
1619 | return run_as_mkdirat_recursive(AT_FDCWD, path, mode, uid, gid); |
1620 | } | |
1621 | ||
28ab034a | 1622 | int run_as_mkdirat_recursive(int dirfd, const char *path, mode_t mode, uid_t uid, gid_t gid) |
18710679 JG |
1623 | { |
1624 | int ret; | |
93bed9fe JG |
1625 | struct run_as_data data = {}; |
1626 | struct run_as_ret run_as_ret = {}; | |
60b6c79c | 1627 | |
18710679 | 1628 | DBG3("mkdirat() recursive fd = %d%s, path = %s, mode = %d, uid = %d, gid = %d", |
28ab034a JG |
1629 | dirfd, |
1630 | dirfd == AT_FDCWD ? " (AT_FDCWD)" : "", | |
1631 | path, | |
1632 | (int) mode, | |
1633 | (int) uid, | |
1634 | (int) gid); | |
1635 | ret = lttng_strncpy(data.u.mkdir.path, path, sizeof(data.u.mkdir.path)); | |
18710679 JG |
1636 | if (ret) { |
1637 | ERR("Failed to copy path argument of mkdirat recursive command"); | |
1638 | goto error; | |
1639 | } | |
93bed9fe JG |
1640 | data.u.mkdir.path[sizeof(data.u.mkdir.path) - 1] = '\0'; |
1641 | data.u.mkdir.mode = mode; | |
1642 | data.u.mkdir.dirfd = dirfd; | |
18710679 | 1643 | run_as(dirfd == AT_FDCWD ? RUN_AS_MKDIR_RECURSIVE : RUN_AS_MKDIRAT_RECURSIVE, |
28ab034a JG |
1644 | &data, |
1645 | &run_as_ret, | |
1646 | uid, | |
1647 | gid); | |
18710679 | 1648 | errno = run_as_ret._errno; |
93bed9fe | 1649 | ret = run_as_ret.u.ret; |
18710679 JG |
1650 | error: |
1651 | return ret; | |
60b6c79c MD |
1652 | } |
1653 | ||
e11d277b | 1654 | int run_as_mkdir(const char *path, mode_t mode, uid_t uid, gid_t gid) |
60b6c79c | 1655 | { |
18710679 JG |
1656 | return run_as_mkdirat(AT_FDCWD, path, mode, uid, gid); |
1657 | } | |
1658 | ||
28ab034a | 1659 | int run_as_mkdirat(int dirfd, const char *path, mode_t mode, uid_t uid, gid_t gid) |
18710679 JG |
1660 | { |
1661 | int ret; | |
93bed9fe JG |
1662 | struct run_as_data data = {}; |
1663 | struct run_as_ret run_as_ret = {}; | |
fe9f7760 | 1664 | |
18710679 | 1665 | DBG3("mkdirat() recursive fd = %d%s, path = %s, mode = %d, uid = %d, gid = %d", |
28ab034a JG |
1666 | dirfd, |
1667 | dirfd == AT_FDCWD ? " (AT_FDCWD)" : "", | |
1668 | path, | |
1669 | (int) mode, | |
1670 | (int) uid, | |
1671 | (int) gid); | |
1672 | ret = lttng_strncpy(data.u.mkdir.path, path, sizeof(data.u.mkdir.path)); | |
18710679 JG |
1673 | if (ret) { |
1674 | ERR("Failed to copy path argument of mkdirat command"); | |
1675 | goto error; | |
1676 | } | |
93bed9fe JG |
1677 | data.u.mkdir.path[sizeof(data.u.mkdir.path) - 1] = '\0'; |
1678 | data.u.mkdir.mode = mode; | |
1679 | data.u.mkdir.dirfd = dirfd; | |
28ab034a | 1680 | run_as(dirfd == AT_FDCWD ? RUN_AS_MKDIR : RUN_AS_MKDIRAT, &data, &run_as_ret, uid, gid); |
18710679 | 1681 | errno = run_as_ret._errno; |
93bed9fe | 1682 | ret = run_as_ret.u.ret; |
18710679 JG |
1683 | error: |
1684 | return ret; | |
60b6c79c MD |
1685 | } |
1686 | ||
28ab034a | 1687 | int run_as_open(const char *path, int flags, mode_t mode, uid_t uid, gid_t gid) |
2912cead JG |
1688 | { |
1689 | return run_as_openat(AT_FDCWD, path, flags, mode, uid, gid); | |
1690 | } | |
1691 | ||
28ab034a | 1692 | int run_as_openat(int dirfd, const char *path, int flags, mode_t mode, uid_t uid, gid_t gid) |
60b6c79c | 1693 | { |
93bed9fe | 1694 | int ret; |
55cb0d6f JG |
1695 | struct run_as_data data = {}; |
1696 | struct run_as_ret run_as_ret = {}; | |
fe9f7760 | 1697 | |
2912cead | 1698 | DBG3("openat() fd = %d%s, path = %s, flags = %X, mode = %d, uid %d, gid %d", |
28ab034a JG |
1699 | dirfd, |
1700 | dirfd == AT_FDCWD ? " (AT_FDCWD)" : "", | |
1701 | path, | |
1702 | flags, | |
1703 | (int) mode, | |
1704 | (int) uid, | |
1705 | (int) gid); | |
93bed9fe JG |
1706 | ret = lttng_strncpy(data.u.open.path, path, sizeof(data.u.open.path)); |
1707 | if (ret) { | |
1708 | ERR("Failed to copy path argument of open command"); | |
1709 | goto error; | |
1710 | } | |
7567352f MD |
1711 | data.u.open.flags = flags; |
1712 | data.u.open.mode = mode; | |
93bed9fe | 1713 | data.u.open.dirfd = dirfd; |
28ab034a | 1714 | run_as(dirfd == AT_FDCWD ? RUN_AS_OPEN : RUN_AS_OPENAT, &data, &run_as_ret, uid, gid); |
93bed9fe | 1715 | errno = run_as_ret._errno; |
28ab034a | 1716 | ret = run_as_ret.u.ret < 0 ? run_as_ret.u.ret : run_as_ret.u.open.fd; |
93bed9fe JG |
1717 | error: |
1718 | return ret; | |
60b6c79c | 1719 | } |
4628484a | 1720 | |
4628484a | 1721 | int run_as_unlink(const char *path, uid_t uid, gid_t gid) |
2912cead JG |
1722 | { |
1723 | return run_as_unlinkat(AT_FDCWD, path, uid, gid); | |
1724 | } | |
1725 | ||
2912cead | 1726 | int run_as_unlinkat(int dirfd, const char *path, uid_t uid, gid_t gid) |
4628484a | 1727 | { |
93bed9fe JG |
1728 | int ret; |
1729 | struct run_as_data data = {}; | |
1730 | struct run_as_ret run_as_ret = {}; | |
fe9f7760 | 1731 | |
2912cead | 1732 | DBG3("unlinkat() fd = %d%s, path = %s, uid = %d, gid = %d", |
28ab034a JG |
1733 | dirfd, |
1734 | dirfd == AT_FDCWD ? " (AT_FDCWD)" : "", | |
1735 | path, | |
1736 | (int) uid, | |
1737 | (int) gid); | |
1738 | ret = lttng_strncpy(data.u.unlink.path, path, sizeof(data.u.unlink.path)); | |
93bed9fe JG |
1739 | if (ret) { |
1740 | goto error; | |
1741 | } | |
1742 | data.u.unlink.dirfd = dirfd; | |
28ab034a | 1743 | run_as(dirfd == AT_FDCWD ? RUN_AS_UNLINK : RUN_AS_UNLINKAT, &data, &run_as_ret, uid, gid); |
93bed9fe JG |
1744 | errno = run_as_ret._errno; |
1745 | ret = run_as_ret.u.ret; | |
1746 | error: | |
1747 | return ret; | |
1748 | } | |
1749 | ||
93bed9fe JG |
1750 | int run_as_rmdir(const char *path, uid_t uid, gid_t gid) |
1751 | { | |
1752 | return run_as_rmdirat(AT_FDCWD, path, uid, gid); | |
1753 | } | |
1754 | ||
93bed9fe JG |
1755 | int run_as_rmdirat(int dirfd, const char *path, uid_t uid, gid_t gid) |
1756 | { | |
1757 | int ret; | |
1758 | struct run_as_data data = {}; | |
1759 | struct run_as_ret run_as_ret = {}; | |
1760 | ||
1761 | DBG3("rmdirat() fd = %d%s, path = %s, uid = %d, gid = %d", | |
28ab034a JG |
1762 | dirfd, |
1763 | dirfd == AT_FDCWD ? " (AT_FDCWD)" : "", | |
1764 | path, | |
1765 | (int) uid, | |
1766 | (int) gid); | |
1767 | ret = lttng_strncpy(data.u.rmdir.path, path, sizeof(data.u.rmdir.path)); | |
93bed9fe JG |
1768 | if (ret) { |
1769 | goto error; | |
1770 | } | |
1771 | data.u.rmdir.dirfd = dirfd; | |
28ab034a | 1772 | run_as(dirfd == AT_FDCWD ? RUN_AS_RMDIR : RUN_AS_RMDIRAT, &data, &run_as_ret, uid, gid); |
93bed9fe JG |
1773 | errno = run_as_ret._errno; |
1774 | ret = run_as_ret.u.ret; | |
1775 | error: | |
1776 | return ret; | |
4628484a MD |
1777 | } |
1778 | ||
f75c5439 | 1779 | int run_as_rmdir_recursive(const char *path, uid_t uid, gid_t gid, int flags) |
4628484a | 1780 | { |
f75c5439 | 1781 | return run_as_rmdirat_recursive(AT_FDCWD, path, uid, gid, flags); |
93bed9fe | 1782 | } |
fe9f7760 | 1783 | |
f75c5439 | 1784 | int run_as_rmdirat_recursive(int dirfd, const char *path, uid_t uid, gid_t gid, int flags) |
93bed9fe JG |
1785 | { |
1786 | int ret; | |
1787 | struct run_as_data data = {}; | |
1788 | struct run_as_ret run_as_ret = {}; | |
4628484a | 1789 | |
93bed9fe | 1790 | DBG3("rmdirat() recursive fd = %d%s, path = %s, uid = %d, gid = %d", |
28ab034a JG |
1791 | dirfd, |
1792 | dirfd == AT_FDCWD ? " (AT_FDCWD)" : "", | |
1793 | path, | |
1794 | (int) uid, | |
1795 | (int) gid); | |
1796 | ret = lttng_strncpy(data.u.rmdir.path, path, sizeof(data.u.rmdir.path)); | |
93bed9fe JG |
1797 | if (ret) { |
1798 | goto error; | |
1799 | } | |
1800 | data.u.rmdir.dirfd = dirfd; | |
f75c5439 | 1801 | data.u.rmdir.flags = flags; |
93bed9fe | 1802 | run_as(dirfd == AT_FDCWD ? RUN_AS_RMDIR_RECURSIVE : RUN_AS_RMDIRAT_RECURSIVE, |
28ab034a JG |
1803 | &data, |
1804 | &run_as_ret, | |
1805 | uid, | |
1806 | gid); | |
93bed9fe JG |
1807 | errno = run_as_ret._errno; |
1808 | ret = run_as_ret.u.ret; | |
1809 | error: | |
1810 | return ret; | |
1811 | } | |
1812 | ||
a6bc4ca9 | 1813 | int run_as_rename(const char *old_name, const char *new_name, uid_t uid, gid_t gid) |
93bed9fe | 1814 | { |
a6bc4ca9 | 1815 | return run_as_renameat(AT_FDCWD, old_name, AT_FDCWD, new_name, uid, gid); |
93bed9fe JG |
1816 | } |
1817 | ||
28ab034a JG |
1818 | int run_as_renameat(int old_dirfd, |
1819 | const char *old_name, | |
1820 | int new_dirfd, | |
1821 | const char *new_name, | |
1822 | uid_t uid, | |
1823 | gid_t gid) | |
93bed9fe JG |
1824 | { |
1825 | int ret; | |
1826 | struct run_as_data data = {}; | |
1827 | struct run_as_ret run_as_ret = {}; | |
1828 | ||
1829 | DBG3("renameat() old_dirfd = %d%s, old_name = %s, new_dirfd = %d%s, new_name = %s, uid = %d, gid = %d", | |
28ab034a JG |
1830 | old_dirfd, |
1831 | old_dirfd == AT_FDCWD ? " (AT_FDCWD)" : "", | |
1832 | old_name, | |
1833 | new_dirfd, | |
1834 | new_dirfd == AT_FDCWD ? " (AT_FDCWD)" : "", | |
1835 | new_name, | |
1836 | (int) uid, | |
1837 | (int) gid); | |
1838 | ret = lttng_strncpy(data.u.rename.old_path, old_name, sizeof(data.u.rename.old_path)); | |
93bed9fe JG |
1839 | if (ret) { |
1840 | goto error; | |
1841 | } | |
28ab034a | 1842 | ret = lttng_strncpy(data.u.rename.new_path, new_name, sizeof(data.u.rename.new_path)); |
93bed9fe JG |
1843 | if (ret) { |
1844 | goto error; | |
1845 | } | |
1846 | ||
1847 | data.u.rename.dirfds[0] = old_dirfd; | |
1848 | data.u.rename.dirfds[1] = new_dirfd; | |
28ab034a JG |
1849 | run_as(old_dirfd == AT_FDCWD && new_dirfd == AT_FDCWD ? RUN_AS_RENAME : RUN_AS_RENAMEAT, |
1850 | &data, | |
1851 | &run_as_ret, | |
1852 | uid, | |
1853 | gid); | |
93bed9fe JG |
1854 | errno = run_as_ret._errno; |
1855 | ret = run_as_ret.u.ret; | |
1856 | error: | |
1857 | return ret; | |
7567352f MD |
1858 | } |
1859 | ||
28ab034a JG |
1860 | int run_as_extract_elf_symbol_offset( |
1861 | int fd, const char *function, uid_t uid, gid_t gid, uint64_t *offset) | |
241e0a5a | 1862 | { |
93bed9fe JG |
1863 | int ret; |
1864 | struct run_as_data data = {}; | |
55cb0d6f | 1865 | struct run_as_ret run_as_ret = {}; |
f726677b | 1866 | |
241e0a5a | 1867 | DBG3("extract_elf_symbol_offset() on fd=%d and function=%s " |
28ab034a JG |
1868 | "with for uid %d and gid %d", |
1869 | fd, | |
1870 | function, | |
1871 | (int) uid, | |
1872 | (int) gid); | |
241e0a5a | 1873 | |
93bed9fe | 1874 | data.u.extract_elf_symbol_offset.fd = fd; |
241e0a5a FD |
1875 | |
1876 | strncpy(data.u.extract_elf_symbol_offset.function, function, LTTNG_SYMBOL_NAME_LEN - 1); | |
241e0a5a | 1877 | data.u.extract_elf_symbol_offset.function[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
93bed9fe | 1878 | ret = lttng_strncpy(data.u.extract_elf_symbol_offset.function, |
28ab034a JG |
1879 | function, |
1880 | sizeof(data.u.extract_elf_symbol_offset.function)); | |
93bed9fe JG |
1881 | if (ret) { |
1882 | goto error; | |
1883 | } | |
241e0a5a | 1884 | |
93bed9fe JG |
1885 | run_as(RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET, &data, &run_as_ret, uid, gid); |
1886 | errno = run_as_ret._errno; | |
1887 | if (run_as_ret._error) { | |
1888 | ret = -1; | |
1889 | goto error; | |
241e0a5a FD |
1890 | } |
1891 | ||
93bed9fe JG |
1892 | *offset = run_as_ret.u.extract_elf_symbol_offset.offset; |
1893 | error: | |
1894 | return ret; | |
241e0a5a FD |
1895 | } |
1896 | ||
28ab034a JG |
1897 | int run_as_extract_sdt_probe_offsets(int fd, |
1898 | const char *provider_name, | |
1899 | const char *probe_name, | |
1900 | uid_t uid, | |
1901 | gid_t gid, | |
1902 | uint64_t **offsets, | |
1903 | uint32_t *num_offset) | |
0ef03255 | 1904 | { |
93bed9fe JG |
1905 | int ret; |
1906 | struct run_as_data data = {}; | |
1907 | struct run_as_ret run_as_ret = {}; | |
f726677b | 1908 | |
0ef03255 | 1909 | DBG3("extract_sdt_probe_offsets() on fd=%d, probe_name=%s and " |
28ab034a JG |
1910 | "provider_name=%s with for uid %d and gid %d", |
1911 | fd, | |
1912 | probe_name, | |
1913 | provider_name, | |
1914 | (int) uid, | |
1915 | (int) gid); | |
0ef03255 | 1916 | |
93bed9fe | 1917 | data.u.extract_sdt_probe_offsets.fd = fd; |
0ef03255 | 1918 | |
28ab034a JG |
1919 | ret = lttng_strncpy(data.u.extract_sdt_probe_offsets.probe_name, |
1920 | probe_name, | |
1921 | sizeof(data.u.extract_sdt_probe_offsets.probe_name)); | |
93bed9fe JG |
1922 | if (ret) { |
1923 | goto error; | |
1924 | } | |
1925 | ret = lttng_strncpy(data.u.extract_sdt_probe_offsets.provider_name, | |
28ab034a JG |
1926 | provider_name, |
1927 | sizeof(data.u.extract_sdt_probe_offsets.provider_name)); | |
93bed9fe JG |
1928 | if (ret) { |
1929 | goto error; | |
0ef03255 FD |
1930 | } |
1931 | ||
93bed9fe JG |
1932 | run_as(RUN_AS_EXTRACT_SDT_PROBE_OFFSETS, &data, &run_as_ret, uid, gid); |
1933 | errno = run_as_ret._errno; | |
1934 | if (run_as_ret._error) { | |
1935 | ret = -1; | |
1936 | goto error; | |
1937 | } | |
0ef03255 | 1938 | |
93bed9fe | 1939 | *num_offset = run_as_ret.u.extract_sdt_probe_offsets.num_offset; |
64803277 | 1940 | *offsets = calloc<uint64_t>(*num_offset); |
0ef03255 | 1941 | if (!*offsets) { |
93bed9fe JG |
1942 | ret = -ENOMEM; |
1943 | goto error; | |
0ef03255 FD |
1944 | } |
1945 | ||
28ab034a JG |
1946 | memcpy(*offsets, |
1947 | run_as_ret.u.extract_sdt_probe_offsets.offsets, | |
1948 | *num_offset * sizeof(uint64_t)); | |
93bed9fe JG |
1949 | error: |
1950 | return ret; | |
0ef03255 FD |
1951 | } |
1952 | ||
c73f064a | 1953 | int run_as_generate_filter_bytecode(const char *filter_expression, |
28ab034a JG |
1954 | const struct lttng_credentials *creds, |
1955 | struct lttng_bytecode **bytecode) | |
c73f064a JR |
1956 | { |
1957 | int ret; | |
1958 | struct run_as_data data = {}; | |
1959 | struct run_as_ret run_as_ret = {}; | |
2b00d462 SM |
1960 | const struct lttng_bytecode *view_bytecode = NULL; |
1961 | struct lttng_bytecode *local_bytecode = NULL; | |
58daac01 JR |
1962 | const uid_t uid = lttng_credentials_get_uid(creds); |
1963 | const gid_t gid = lttng_credentials_get_gid(creds); | |
c73f064a JR |
1964 | |
1965 | DBG3("generate_filter_bytecode() from expression=\"%s\" for uid %d and gid %d", | |
28ab034a JG |
1966 | filter_expression, |
1967 | (int) uid, | |
1968 | (int) gid); | |
c73f064a | 1969 | |
28ab034a JG |
1970 | ret = lttng_strncpy(data.u.generate_filter_bytecode.filter_expression, |
1971 | filter_expression, | |
1972 | sizeof(data.u.generate_filter_bytecode.filter_expression)); | |
c73f064a JR |
1973 | if (ret) { |
1974 | goto error; | |
1975 | } | |
1976 | ||
1977 | run_as(RUN_AS_GENERATE_FILTER_BYTECODE, &data, &run_as_ret, uid, gid); | |
1978 | errno = run_as_ret._errno; | |
1979 | if (run_as_ret._error) { | |
1980 | ret = -1; | |
1981 | goto error; | |
1982 | } | |
1983 | ||
28ab034a JG |
1984 | view_bytecode = |
1985 | (const struct lttng_bytecode *) run_as_ret.u.generate_filter_bytecode.bytecode; | |
c73f064a | 1986 | |
64803277 | 1987 | local_bytecode = calloc<lttng_bytecode>(view_bytecode->len); |
c73f064a JR |
1988 | if (!local_bytecode) { |
1989 | ret = -ENOMEM; | |
1990 | goto error; | |
1991 | } | |
1992 | ||
28ab034a JG |
1993 | memcpy(local_bytecode, |
1994 | run_as_ret.u.generate_filter_bytecode.bytecode, | |
1995 | sizeof(*local_bytecode) + view_bytecode->len); | |
c73f064a JR |
1996 | *bytecode = local_bytecode; |
1997 | error: | |
1998 | return ret; | |
1999 | } | |
2000 | ||
929f71ec | 2001 | int run_as_create_worker(const char *procname, |
28ab034a JG |
2002 | post_fork_cleanup_cb clean_up_func, |
2003 | void *clean_up_user_data) | |
7567352f | 2004 | { |
8fec83ea | 2005 | int ret; |
7567352f | 2006 | |
749b7a0c | 2007 | pthread_mutex_lock(&worker_lock); |
28ab034a | 2008 | ret = run_as_create_worker_no_lock(procname, clean_up_func, clean_up_user_data); |
749b7a0c | 2009 | pthread_mutex_unlock(&worker_lock); |
7567352f MD |
2010 | return ret; |
2011 | } | |
2012 | ||
7567352f MD |
2013 | void run_as_destroy_worker(void) |
2014 | { | |
749b7a0c | 2015 | pthread_mutex_lock(&worker_lock); |
a01c682b | 2016 | run_as_destroy_worker_no_lock(); |
749b7a0c | 2017 | pthread_mutex_unlock(&worker_lock); |
4628484a | 2018 | } |