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[thirdparty/systemd.git] / src / core / main.c
1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3 #include <errno.h>
4 #include <fcntl.h>
5 #include <getopt.h>
6 #include <linux/oom.h>
7 #include <sys/mount.h>
8 #include <sys/prctl.h>
9 #include <sys/utsname.h>
10 #include <unistd.h>
11 #if HAVE_SECCOMP
12 #include <seccomp.h>
13 #endif
14 #if HAVE_VALGRIND_VALGRIND_H
15 #include <valgrind/valgrind.h>
16 #endif
17
18 #include "sd-bus.h"
19 #include "sd-daemon.h"
20 #include "sd-messages.h"
21
22 #include "alloc-util.h"
23 #include "apparmor-setup.h"
24 #include "architecture.h"
25 #if HAVE_LIBBPF
26 #include "bpf-lsm.h"
27 #endif
28 #include "build.h"
29 #include "bus-error.h"
30 #include "bus-util.h"
31 #include "capability-util.h"
32 #include "cgroup-util.h"
33 #include "clock-util.h"
34 #include "conf-parser.h"
35 #include "cpu-set-util.h"
36 #include "crash-handler.h"
37 #include "dbus-manager.h"
38 #include "dbus.h"
39 #include "def.h"
40 #include "dev-setup.h"
41 #include "efi-random.h"
42 #include "efivars.h"
43 #include "emergency-action.h"
44 #include "env-util.h"
45 #include "exit-status.h"
46 #include "fd-util.h"
47 #include "fdset.h"
48 #include "fileio.h"
49 #include "format-util.h"
50 #include "fs-util.h"
51 #include "hexdecoct.h"
52 #include "hostname-setup.h"
53 #include "ima-setup.h"
54 #include "killall.h"
55 #include "kmod-setup.h"
56 #include "limits-util.h"
57 #include "load-fragment.h"
58 #include "log.h"
59 #include "loopback-setup.h"
60 #include "machine-id-setup.h"
61 #include "main.h"
62 #include "manager.h"
63 #include "manager-dump.h"
64 #include "manager-serialize.h"
65 #include "mkdir-label.h"
66 #include "mount-setup.h"
67 #include "os-util.h"
68 #include "pager.h"
69 #include "parse-argument.h"
70 #include "parse-util.h"
71 #include "path-util.h"
72 #include "pretty-print.h"
73 #include "proc-cmdline.h"
74 #include "process-util.h"
75 #include "random-util.h"
76 #include "rlimit-util.h"
77 #if HAVE_SECCOMP
78 #include "seccomp-util.h"
79 #endif
80 #include "selinux-setup.h"
81 #include "selinux-util.h"
82 #include "signal-util.h"
83 #include "smack-setup.h"
84 #include "special.h"
85 #include "stat-util.h"
86 #include "stdio-util.h"
87 #include "strv.h"
88 #include "switch-root.h"
89 #include "sysctl-util.h"
90 #include "terminal-util.h"
91 #include "time-util.h"
92 #include "umask-util.h"
93 #include "user-util.h"
94 #include "util.h"
95 #include "virt.h"
96 #include "watchdog.h"
97
98 #if HAS_FEATURE_ADDRESS_SANITIZER
99 #include <sanitizer/lsan_interface.h>
100 #endif
101
102 #define DEFAULT_TASKS_MAX ((TasksMax) { 15U, 100U }) /* 15% */
103
104 static enum {
105 ACTION_RUN,
106 ACTION_HELP,
107 ACTION_VERSION,
108 ACTION_TEST,
109 ACTION_DUMP_CONFIGURATION_ITEMS,
110 ACTION_DUMP_BUS_PROPERTIES,
111 ACTION_BUS_INTROSPECT,
112 } arg_action = ACTION_RUN;
113
114 static const char *arg_bus_introspect = NULL;
115
116 /* Those variables are initialized to 0 automatically, so we avoid uninitialized memory access. Real
117 * defaults are assigned in reset_arguments() below. */
118 static char *arg_default_unit;
119 static bool arg_system;
120 bool arg_dump_core;
121 int arg_crash_chvt;
122 bool arg_crash_shell;
123 bool arg_crash_reboot;
124 static char *arg_confirm_spawn;
125 static ShowStatus arg_show_status;
126 static StatusUnitFormat arg_status_unit_format;
127 static bool arg_switched_root;
128 static PagerFlags arg_pager_flags;
129 static bool arg_service_watchdogs;
130 static ExecOutput arg_default_std_output;
131 static ExecOutput arg_default_std_error;
132 static usec_t arg_default_restart_usec;
133 static usec_t arg_default_timeout_start_usec;
134 static usec_t arg_default_timeout_stop_usec;
135 static usec_t arg_default_timeout_abort_usec;
136 static bool arg_default_timeout_abort_set;
137 static usec_t arg_default_start_limit_interval;
138 static unsigned arg_default_start_limit_burst;
139 static usec_t arg_runtime_watchdog;
140 static usec_t arg_reboot_watchdog;
141 static usec_t arg_kexec_watchdog;
142 static usec_t arg_pretimeout_watchdog;
143 static char *arg_early_core_pattern;
144 static char *arg_watchdog_pretimeout_governor;
145 static char *arg_watchdog_device;
146 static char **arg_default_environment;
147 static char **arg_manager_environment;
148 static struct rlimit *arg_default_rlimit[_RLIMIT_MAX];
149 static uint64_t arg_capability_bounding_set;
150 static bool arg_no_new_privs;
151 static nsec_t arg_timer_slack_nsec;
152 static usec_t arg_default_timer_accuracy_usec;
153 static Set* arg_syscall_archs;
154 static FILE* arg_serialization;
155 static int arg_default_cpu_accounting;
156 static bool arg_default_io_accounting;
157 static bool arg_default_ip_accounting;
158 static bool arg_default_blockio_accounting;
159 static bool arg_default_memory_accounting;
160 static bool arg_default_tasks_accounting;
161 static TasksMax arg_default_tasks_max;
162 static sd_id128_t arg_machine_id;
163 static EmergencyAction arg_cad_burst_action;
164 static OOMPolicy arg_default_oom_policy;
165 static CPUSet arg_cpu_affinity;
166 static NUMAPolicy arg_numa_policy;
167 static usec_t arg_clock_usec;
168 static void *arg_random_seed;
169 static size_t arg_random_seed_size;
170 static int arg_default_oom_score_adjust;
171 static bool arg_default_oom_score_adjust_set;
172
173 /* A copy of the original environment block */
174 static char **saved_env = NULL;
175
176 static int parse_configuration(const struct rlimit *saved_rlimit_nofile,
177 const struct rlimit *saved_rlimit_memlock);
178
179 static int manager_find_user_config_paths(char ***ret_files, char ***ret_dirs) {
180 _cleanup_free_ char *base = NULL;
181 _cleanup_strv_free_ char **files = NULL, **dirs = NULL;
182 int r;
183
184 r = xdg_user_config_dir(&base, "/systemd");
185 if (r < 0)
186 return r;
187
188 r = strv_extendf(&files, "%s/user.conf", base);
189 if (r < 0)
190 return r;
191
192 r = strv_extend(&files, PKGSYSCONFDIR "/user.conf");
193 if (r < 0)
194 return r;
195
196 r = strv_consume(&dirs, TAKE_PTR(base));
197 if (r < 0)
198 return r;
199
200 r = strv_extend_strv(&dirs, CONF_PATHS_STRV("systemd"), false);
201 if (r < 0)
202 return r;
203
204 *ret_files = TAKE_PTR(files);
205 *ret_dirs = TAKE_PTR(dirs);
206 return 0;
207 }
208
209 static int console_setup(void) {
210 _cleanup_close_ int tty_fd = -1;
211 int r;
212
213 tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
214 if (tty_fd < 0)
215 return log_error_errno(tty_fd, "Failed to open /dev/console: %m");
216
217 /* We don't want to force text mode. plymouth may be showing
218 * pictures already from initrd. */
219 r = reset_terminal_fd(tty_fd, false);
220 if (r < 0)
221 return log_error_errno(r, "Failed to reset /dev/console: %m");
222
223 return 0;
224 }
225
226 static int set_machine_id(const char *m) {
227 sd_id128_t t;
228 assert(m);
229
230 if (sd_id128_from_string(m, &t) < 0)
231 return -EINVAL;
232
233 if (sd_id128_is_null(t))
234 return -EINVAL;
235
236 arg_machine_id = t;
237 return 0;
238 }
239
240 static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
241 int r;
242
243 assert(key);
244
245 if (STR_IN_SET(key, "systemd.unit", "rd.systemd.unit")) {
246
247 if (proc_cmdline_value_missing(key, value))
248 return 0;
249
250 if (!unit_name_is_valid(value, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE))
251 log_warning("Unit name specified on %s= is not valid, ignoring: %s", key, value);
252 else if (in_initrd() == !!startswith(key, "rd."))
253 return free_and_strdup_warn(&arg_default_unit, value);
254
255 } else if (proc_cmdline_key_streq(key, "systemd.dump_core")) {
256
257 r = value ? parse_boolean(value) : true;
258 if (r < 0)
259 log_warning_errno(r, "Failed to parse dump core switch %s, ignoring: %m", value);
260 else
261 arg_dump_core = r;
262
263 } else if (proc_cmdline_key_streq(key, "systemd.early_core_pattern")) {
264
265 if (proc_cmdline_value_missing(key, value))
266 return 0;
267
268 if (path_is_absolute(value))
269 (void) parse_path_argument(value, false, &arg_early_core_pattern);
270 else
271 log_warning("Specified core pattern '%s' is not an absolute path, ignoring.", value);
272
273 } else if (proc_cmdline_key_streq(key, "systemd.crash_chvt")) {
274
275 if (!value)
276 arg_crash_chvt = 0; /* turn on */
277 else {
278 r = parse_crash_chvt(value, &arg_crash_chvt);
279 if (r < 0)
280 log_warning_errno(r, "Failed to parse crash chvt switch %s, ignoring: %m", value);
281 }
282
283 } else if (proc_cmdline_key_streq(key, "systemd.crash_shell")) {
284
285 r = value ? parse_boolean(value) : true;
286 if (r < 0)
287 log_warning_errno(r, "Failed to parse crash shell switch %s, ignoring: %m", value);
288 else
289 arg_crash_shell = r;
290
291 } else if (proc_cmdline_key_streq(key, "systemd.crash_reboot")) {
292
293 r = value ? parse_boolean(value) : true;
294 if (r < 0)
295 log_warning_errno(r, "Failed to parse crash reboot switch %s, ignoring: %m", value);
296 else
297 arg_crash_reboot = r;
298
299 } else if (proc_cmdline_key_streq(key, "systemd.confirm_spawn")) {
300 char *s;
301
302 r = parse_confirm_spawn(value, &s);
303 if (r < 0)
304 log_warning_errno(r, "Failed to parse confirm_spawn switch %s, ignoring: %m", value);
305 else
306 free_and_replace(arg_confirm_spawn, s);
307
308 } else if (proc_cmdline_key_streq(key, "systemd.service_watchdogs")) {
309
310 r = value ? parse_boolean(value) : true;
311 if (r < 0)
312 log_warning_errno(r, "Failed to parse service watchdog switch %s, ignoring: %m", value);
313 else
314 arg_service_watchdogs = r;
315
316 } else if (proc_cmdline_key_streq(key, "systemd.show_status")) {
317
318 if (value) {
319 r = parse_show_status(value, &arg_show_status);
320 if (r < 0)
321 log_warning_errno(r, "Failed to parse show status switch %s, ignoring: %m", value);
322 } else
323 arg_show_status = SHOW_STATUS_YES;
324
325 } else if (proc_cmdline_key_streq(key, "systemd.status_unit_format")) {
326
327 if (proc_cmdline_value_missing(key, value))
328 return 0;
329
330 r = status_unit_format_from_string(value);
331 if (r < 0)
332 log_warning_errno(r, "Failed to parse %s=%s, ignoring: %m", key, value);
333 else
334 arg_status_unit_format = r;
335
336 } else if (proc_cmdline_key_streq(key, "systemd.default_standard_output")) {
337
338 if (proc_cmdline_value_missing(key, value))
339 return 0;
340
341 r = exec_output_from_string(value);
342 if (r < 0)
343 log_warning_errno(r, "Failed to parse default standard output switch %s, ignoring: %m", value);
344 else
345 arg_default_std_output = r;
346
347 } else if (proc_cmdline_key_streq(key, "systemd.default_standard_error")) {
348
349 if (proc_cmdline_value_missing(key, value))
350 return 0;
351
352 r = exec_output_from_string(value);
353 if (r < 0)
354 log_warning_errno(r, "Failed to parse default standard error switch %s, ignoring: %m", value);
355 else
356 arg_default_std_error = r;
357
358 } else if (streq(key, "systemd.setenv")) {
359
360 if (proc_cmdline_value_missing(key, value))
361 return 0;
362
363 if (!env_assignment_is_valid(value))
364 log_warning("Environment variable assignment '%s' is not valid. Ignoring.", value);
365 else {
366 r = strv_env_replace_strdup(&arg_default_environment, value);
367 if (r < 0)
368 return log_oom();
369 }
370
371 } else if (proc_cmdline_key_streq(key, "systemd.machine_id")) {
372
373 if (proc_cmdline_value_missing(key, value))
374 return 0;
375
376 r = set_machine_id(value);
377 if (r < 0)
378 log_warning_errno(r, "MachineID '%s' is not valid, ignoring: %m", value);
379
380 } else if (proc_cmdline_key_streq(key, "systemd.default_timeout_start_sec")) {
381
382 if (proc_cmdline_value_missing(key, value))
383 return 0;
384
385 r = parse_sec(value, &arg_default_timeout_start_usec);
386 if (r < 0)
387 log_warning_errno(r, "Failed to parse default start timeout '%s', ignoring: %m", value);
388
389 if (arg_default_timeout_start_usec <= 0)
390 arg_default_timeout_start_usec = USEC_INFINITY;
391
392 } else if (proc_cmdline_key_streq(key, "systemd.cpu_affinity")) {
393
394 if (proc_cmdline_value_missing(key, value))
395 return 0;
396
397 r = parse_cpu_set(value, &arg_cpu_affinity);
398 if (r < 0)
399 log_warning_errno(r, "Failed to parse CPU affinity mask '%s', ignoring: %m", value);
400
401 } else if (proc_cmdline_key_streq(key, "systemd.watchdog_device")) {
402
403 if (proc_cmdline_value_missing(key, value))
404 return 0;
405
406 (void) parse_path_argument(value, false, &arg_watchdog_device);
407
408 } else if (proc_cmdline_key_streq(key, "systemd.watchdog_sec")) {
409
410 if (proc_cmdline_value_missing(key, value))
411 return 0;
412
413 if (streq(value, "default"))
414 arg_runtime_watchdog = USEC_INFINITY;
415 else if (streq(value, "off"))
416 arg_runtime_watchdog = 0;
417 else {
418 r = parse_sec(value, &arg_runtime_watchdog);
419 if (r < 0) {
420 log_warning_errno(r, "Failed to parse systemd.watchdog_sec= argument '%s', ignoring: %m", value);
421 return 0;
422 }
423 }
424
425 arg_kexec_watchdog = arg_reboot_watchdog = arg_runtime_watchdog;
426
427 } else if (proc_cmdline_key_streq(key, "systemd.watchdog_pre_sec")) {
428
429 if (proc_cmdline_value_missing(key, value))
430 return 0;
431
432 if (streq(value, "default"))
433 arg_pretimeout_watchdog = USEC_INFINITY;
434 else if (streq(value, "off"))
435 arg_pretimeout_watchdog = 0;
436 else {
437 r = parse_sec(value, &arg_pretimeout_watchdog);
438 if (r < 0) {
439 log_warning_errno(r, "Failed to parse systemd.watchdog_pre_sec= argument '%s', ignoring: %m", value);
440 return 0;
441 }
442 }
443
444 } else if (proc_cmdline_key_streq(key, "systemd.watchdog_pretimeout_governor")) {
445
446 if (proc_cmdline_value_missing(key, value) || isempty(value)) {
447 arg_watchdog_pretimeout_governor = mfree(arg_watchdog_pretimeout_governor);
448 return 0;
449 }
450
451 if (!string_is_safe(value)) {
452 log_warning("Watchdog pretimeout governor '%s' is not valid, ignoring.", value);
453 return 0;
454 }
455
456 return free_and_strdup_warn(&arg_watchdog_pretimeout_governor, value);
457
458 } else if (proc_cmdline_key_streq(key, "systemd.clock_usec")) {
459
460 if (proc_cmdline_value_missing(key, value))
461 return 0;
462
463 r = safe_atou64(value, &arg_clock_usec);
464 if (r < 0)
465 log_warning_errno(r, "Failed to parse systemd.clock_usec= argument, ignoring: %s", value);
466
467 } else if (proc_cmdline_key_streq(key, "systemd.random_seed")) {
468 void *p;
469 size_t sz;
470
471 if (proc_cmdline_value_missing(key, value))
472 return 0;
473
474 r = unbase64mem(value, SIZE_MAX, &p, &sz);
475 if (r < 0)
476 log_warning_errno(r, "Failed to parse systemd.random_seed= argument, ignoring: %s", value);
477
478 free(arg_random_seed);
479 arg_random_seed = sz > 0 ? p : mfree(p);
480 arg_random_seed_size = sz;
481
482 } else if (streq(key, "quiet") && !value) {
483
484 if (arg_show_status == _SHOW_STATUS_INVALID)
485 arg_show_status = SHOW_STATUS_ERROR;
486
487 } else if (streq(key, "debug") && !value) {
488
489 /* Note that log_parse_environment() handles 'debug'
490 * too, and sets the log level to LOG_DEBUG. */
491
492 if (detect_container() > 0)
493 log_set_target(LOG_TARGET_CONSOLE);
494
495 } else if (!value) {
496 const char *target;
497
498 /* Compatible with SysV, but supported independently even if SysV compatibility is disabled. */
499 target = runlevel_to_target(key);
500 if (target)
501 return free_and_strdup_warn(&arg_default_unit, target);
502 }
503
504 return 0;
505 }
506
507 #define DEFINE_SETTER(name, func, descr) \
508 static int name(const char *unit, \
509 const char *filename, \
510 unsigned line, \
511 const char *section, \
512 unsigned section_line, \
513 const char *lvalue, \
514 int ltype, \
515 const char *rvalue, \
516 void *data, \
517 void *userdata) { \
518 \
519 int r; \
520 \
521 assert(filename); \
522 assert(lvalue); \
523 assert(rvalue); \
524 \
525 r = func(rvalue); \
526 if (r < 0) \
527 log_syntax(unit, LOG_ERR, filename, line, r, \
528 "Invalid " descr "'%s': %m", \
529 rvalue); \
530 \
531 return 0; \
532 }
533
534 DEFINE_SETTER(config_parse_level2, log_set_max_level_from_string, "log level");
535 DEFINE_SETTER(config_parse_target, log_set_target_from_string, "target");
536 DEFINE_SETTER(config_parse_color, log_show_color_from_string, "color");
537 DEFINE_SETTER(config_parse_location, log_show_location_from_string, "location");
538 DEFINE_SETTER(config_parse_time, log_show_time_from_string, "time");
539
540 static int config_parse_default_timeout_abort(
541 const char *unit,
542 const char *filename,
543 unsigned line,
544 const char *section,
545 unsigned section_line,
546 const char *lvalue,
547 int ltype,
548 const char *rvalue,
549 void *data,
550 void *userdata) {
551 int r;
552
553 r = config_parse_timeout_abort(unit, filename, line, section, section_line, lvalue, ltype, rvalue,
554 &arg_default_timeout_abort_usec, userdata);
555 if (r >= 0)
556 arg_default_timeout_abort_set = r;
557 return 0;
558 }
559
560 static int config_parse_oom_score_adjust(
561 const char *unit,
562 const char *filename,
563 unsigned line,
564 const char *section,
565 unsigned section_line,
566 const char *lvalue,
567 int ltype,
568 const char *rvalue,
569 void *data,
570 void *userdata) {
571
572 int oa, r;
573
574 if (isempty(rvalue)) {
575 arg_default_oom_score_adjust_set = false;
576 return 0;
577 }
578
579 r = parse_oom_score_adjust(rvalue, &oa);
580 if (r < 0) {
581 log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to parse the OOM score adjust value '%s', ignoring: %m", rvalue);
582 return 0;
583 }
584
585 arg_default_oom_score_adjust = oa;
586 arg_default_oom_score_adjust_set = true;
587
588 return 0;
589 }
590
591 static int parse_config_file(void) {
592 const ConfigTableItem items[] = {
593 { "Manager", "LogLevel", config_parse_level2, 0, NULL },
594 { "Manager", "LogTarget", config_parse_target, 0, NULL },
595 { "Manager", "LogColor", config_parse_color, 0, NULL },
596 { "Manager", "LogLocation", config_parse_location, 0, NULL },
597 { "Manager", "LogTime", config_parse_time, 0, NULL },
598 { "Manager", "DumpCore", config_parse_bool, 0, &arg_dump_core },
599 { "Manager", "CrashChVT", /* legacy */ config_parse_crash_chvt, 0, &arg_crash_chvt },
600 { "Manager", "CrashChangeVT", config_parse_crash_chvt, 0, &arg_crash_chvt },
601 { "Manager", "CrashShell", config_parse_bool, 0, &arg_crash_shell },
602 { "Manager", "CrashReboot", config_parse_bool, 0, &arg_crash_reboot },
603 { "Manager", "ShowStatus", config_parse_show_status, 0, &arg_show_status },
604 { "Manager", "StatusUnitFormat", config_parse_status_unit_format, 0, &arg_status_unit_format },
605 { "Manager", "CPUAffinity", config_parse_cpu_affinity2, 0, &arg_cpu_affinity },
606 { "Manager", "NUMAPolicy", config_parse_numa_policy, 0, &arg_numa_policy.type },
607 { "Manager", "NUMAMask", config_parse_numa_mask, 0, &arg_numa_policy },
608 { "Manager", "JoinControllers", config_parse_warn_compat, DISABLED_CONFIGURATION, NULL },
609 { "Manager", "RuntimeWatchdogSec", config_parse_watchdog_sec, 0, &arg_runtime_watchdog },
610 { "Manager", "RuntimeWatchdogPreSec", config_parse_watchdog_sec, 0, &arg_pretimeout_watchdog },
611 { "Manager", "RebootWatchdogSec", config_parse_watchdog_sec, 0, &arg_reboot_watchdog },
612 { "Manager", "ShutdownWatchdogSec", config_parse_watchdog_sec, 0, &arg_reboot_watchdog }, /* obsolete alias */
613 { "Manager", "KExecWatchdogSec", config_parse_watchdog_sec, 0, &arg_kexec_watchdog },
614 { "Manager", "WatchdogDevice", config_parse_path, 0, &arg_watchdog_device },
615 { "Manager", "RuntimeWatchdogPreGovernor", config_parse_string, CONFIG_PARSE_STRING_SAFE, &arg_watchdog_pretimeout_governor },
616 { "Manager", "CapabilityBoundingSet", config_parse_capability_set, 0, &arg_capability_bounding_set },
617 { "Manager", "NoNewPrivileges", config_parse_bool, 0, &arg_no_new_privs },
618 #if HAVE_SECCOMP
619 { "Manager", "SystemCallArchitectures", config_parse_syscall_archs, 0, &arg_syscall_archs },
620 #endif
621 { "Manager", "TimerSlackNSec", config_parse_nsec, 0, &arg_timer_slack_nsec },
622 { "Manager", "DefaultTimerAccuracySec", config_parse_sec, 0, &arg_default_timer_accuracy_usec },
623 { "Manager", "DefaultStandardOutput", config_parse_output_restricted, 0, &arg_default_std_output },
624 { "Manager", "DefaultStandardError", config_parse_output_restricted, 0, &arg_default_std_error },
625 { "Manager", "DefaultTimeoutStartSec", config_parse_sec, 0, &arg_default_timeout_start_usec },
626 { "Manager", "DefaultTimeoutStopSec", config_parse_sec, 0, &arg_default_timeout_stop_usec },
627 { "Manager", "DefaultTimeoutAbortSec", config_parse_default_timeout_abort, 0, NULL },
628 { "Manager", "DefaultRestartSec", config_parse_sec, 0, &arg_default_restart_usec },
629 { "Manager", "DefaultStartLimitInterval", config_parse_sec, 0, &arg_default_start_limit_interval }, /* obsolete alias */
630 { "Manager", "DefaultStartLimitIntervalSec", config_parse_sec, 0, &arg_default_start_limit_interval },
631 { "Manager", "DefaultStartLimitBurst", config_parse_unsigned, 0, &arg_default_start_limit_burst },
632 { "Manager", "DefaultEnvironment", config_parse_environ, 0, &arg_default_environment },
633 { "Manager", "ManagerEnvironment", config_parse_environ, 0, &arg_manager_environment },
634 { "Manager", "DefaultLimitCPU", config_parse_rlimit, RLIMIT_CPU, arg_default_rlimit },
635 { "Manager", "DefaultLimitFSIZE", config_parse_rlimit, RLIMIT_FSIZE, arg_default_rlimit },
636 { "Manager", "DefaultLimitDATA", config_parse_rlimit, RLIMIT_DATA, arg_default_rlimit },
637 { "Manager", "DefaultLimitSTACK", config_parse_rlimit, RLIMIT_STACK, arg_default_rlimit },
638 { "Manager", "DefaultLimitCORE", config_parse_rlimit, RLIMIT_CORE, arg_default_rlimit },
639 { "Manager", "DefaultLimitRSS", config_parse_rlimit, RLIMIT_RSS, arg_default_rlimit },
640 { "Manager", "DefaultLimitNOFILE", config_parse_rlimit, RLIMIT_NOFILE, arg_default_rlimit },
641 { "Manager", "DefaultLimitAS", config_parse_rlimit, RLIMIT_AS, arg_default_rlimit },
642 { "Manager", "DefaultLimitNPROC", config_parse_rlimit, RLIMIT_NPROC, arg_default_rlimit },
643 { "Manager", "DefaultLimitMEMLOCK", config_parse_rlimit, RLIMIT_MEMLOCK, arg_default_rlimit },
644 { "Manager", "DefaultLimitLOCKS", config_parse_rlimit, RLIMIT_LOCKS, arg_default_rlimit },
645 { "Manager", "DefaultLimitSIGPENDING", config_parse_rlimit, RLIMIT_SIGPENDING, arg_default_rlimit },
646 { "Manager", "DefaultLimitMSGQUEUE", config_parse_rlimit, RLIMIT_MSGQUEUE, arg_default_rlimit },
647 { "Manager", "DefaultLimitNICE", config_parse_rlimit, RLIMIT_NICE, arg_default_rlimit },
648 { "Manager", "DefaultLimitRTPRIO", config_parse_rlimit, RLIMIT_RTPRIO, arg_default_rlimit },
649 { "Manager", "DefaultLimitRTTIME", config_parse_rlimit, RLIMIT_RTTIME, arg_default_rlimit },
650 { "Manager", "DefaultCPUAccounting", config_parse_tristate, 0, &arg_default_cpu_accounting },
651 { "Manager", "DefaultIOAccounting", config_parse_bool, 0, &arg_default_io_accounting },
652 { "Manager", "DefaultIPAccounting", config_parse_bool, 0, &arg_default_ip_accounting },
653 { "Manager", "DefaultBlockIOAccounting", config_parse_bool, 0, &arg_default_blockio_accounting },
654 { "Manager", "DefaultMemoryAccounting", config_parse_bool, 0, &arg_default_memory_accounting },
655 { "Manager", "DefaultTasksAccounting", config_parse_bool, 0, &arg_default_tasks_accounting },
656 { "Manager", "DefaultTasksMax", config_parse_tasks_max, 0, &arg_default_tasks_max },
657 { "Manager", "CtrlAltDelBurstAction", config_parse_emergency_action, 0, &arg_cad_burst_action },
658 { "Manager", "DefaultOOMPolicy", config_parse_oom_policy, 0, &arg_default_oom_policy },
659 { "Manager", "DefaultOOMScoreAdjust", config_parse_oom_score_adjust, 0, NULL },
660 {}
661 };
662
663 _cleanup_strv_free_ char **files = NULL, **dirs = NULL;
664 const char *suffix;
665 int r;
666
667 if (arg_system)
668 suffix = "system.conf.d";
669 else {
670 r = manager_find_user_config_paths(&files, &dirs);
671 if (r < 0)
672 return log_error_errno(r, "Failed to determine config file paths: %m");
673
674 suffix = "user.conf.d";
675 }
676
677 (void) config_parse_many(
678 (const char* const*) (files ?: STRV_MAKE(PKGSYSCONFDIR "/system.conf")),
679 (const char* const*) (dirs ?: CONF_PATHS_STRV("systemd")),
680 suffix,
681 "Manager\0",
682 config_item_table_lookup, items,
683 CONFIG_PARSE_WARN,
684 NULL,
685 NULL);
686
687 /* Traditionally "0" was used to turn off the default unit timeouts. Fix this up so that we use
688 * USEC_INFINITY like everywhere else. */
689 if (arg_default_timeout_start_usec <= 0)
690 arg_default_timeout_start_usec = USEC_INFINITY;
691 if (arg_default_timeout_stop_usec <= 0)
692 arg_default_timeout_stop_usec = USEC_INFINITY;
693
694 return 0;
695 }
696
697 static void set_manager_defaults(Manager *m) {
698
699 assert(m);
700
701 /* Propagates the various default unit property settings into the manager object, i.e. properties that do not
702 * affect the manager itself, but are just what newly allocated units will have set if they haven't set
703 * anything else. (Also see set_manager_settings() for the settings that affect the manager's own behaviour) */
704
705 m->default_timer_accuracy_usec = arg_default_timer_accuracy_usec;
706 m->default_std_output = arg_default_std_output;
707 m->default_std_error = arg_default_std_error;
708 m->default_timeout_start_usec = arg_default_timeout_start_usec;
709 m->default_timeout_stop_usec = arg_default_timeout_stop_usec;
710 m->default_timeout_abort_usec = arg_default_timeout_abort_usec;
711 m->default_timeout_abort_set = arg_default_timeout_abort_set;
712 m->default_restart_usec = arg_default_restart_usec;
713 m->default_start_limit_interval = arg_default_start_limit_interval;
714 m->default_start_limit_burst = arg_default_start_limit_burst;
715
716 /* On 4.15+ with unified hierarchy, CPU accounting is essentially free as it doesn't require the CPU
717 * controller to be enabled, so the default is to enable it unless we got told otherwise. */
718 if (arg_default_cpu_accounting >= 0)
719 m->default_cpu_accounting = arg_default_cpu_accounting;
720 else
721 m->default_cpu_accounting = cpu_accounting_is_cheap();
722
723 m->default_io_accounting = arg_default_io_accounting;
724 m->default_ip_accounting = arg_default_ip_accounting;
725 m->default_blockio_accounting = arg_default_blockio_accounting;
726 m->default_memory_accounting = arg_default_memory_accounting;
727 m->default_tasks_accounting = arg_default_tasks_accounting;
728 m->default_tasks_max = arg_default_tasks_max;
729 m->default_oom_policy = arg_default_oom_policy;
730 m->default_oom_score_adjust_set = arg_default_oom_score_adjust_set;
731 m->default_oom_score_adjust = arg_default_oom_score_adjust;
732
733 (void) manager_set_default_rlimits(m, arg_default_rlimit);
734
735 (void) manager_default_environment(m);
736 (void) manager_transient_environment_add(m, arg_default_environment);
737 }
738
739 static void set_manager_settings(Manager *m) {
740 int r;
741
742 assert(m);
743
744 /* Propagates the various manager settings into the manager object, i.e. properties that
745 * effect the manager itself (as opposed to just being inherited into newly allocated
746 * units, see set_manager_defaults() above). */
747
748 m->confirm_spawn = arg_confirm_spawn;
749 m->service_watchdogs = arg_service_watchdogs;
750 m->cad_burst_action = arg_cad_burst_action;
751
752 manager_set_watchdog(m, WATCHDOG_RUNTIME, arg_runtime_watchdog);
753 manager_set_watchdog(m, WATCHDOG_REBOOT, arg_reboot_watchdog);
754 manager_set_watchdog(m, WATCHDOG_KEXEC, arg_kexec_watchdog);
755 manager_set_watchdog(m, WATCHDOG_PRETIMEOUT, arg_pretimeout_watchdog);
756 r = manager_set_watchdog_pretimeout_governor(m, arg_watchdog_pretimeout_governor);
757 if (r < 0)
758 log_warning_errno(r, "Failed to set watchdog pretimeout governor to '%s', ignoring: %m", arg_watchdog_pretimeout_governor);
759
760 manager_set_show_status(m, arg_show_status, "commandline");
761 m->status_unit_format = arg_status_unit_format;
762 }
763
764 static int parse_argv(int argc, char *argv[]) {
765 enum {
766 ARG_LOG_LEVEL = 0x100,
767 ARG_LOG_TARGET,
768 ARG_LOG_COLOR,
769 ARG_LOG_LOCATION,
770 ARG_LOG_TIME,
771 ARG_UNIT,
772 ARG_SYSTEM,
773 ARG_USER,
774 ARG_TEST,
775 ARG_NO_PAGER,
776 ARG_VERSION,
777 ARG_DUMP_CONFIGURATION_ITEMS,
778 ARG_DUMP_BUS_PROPERTIES,
779 ARG_BUS_INTROSPECT,
780 ARG_DUMP_CORE,
781 ARG_CRASH_CHVT,
782 ARG_CRASH_SHELL,
783 ARG_CRASH_REBOOT,
784 ARG_CONFIRM_SPAWN,
785 ARG_SHOW_STATUS,
786 ARG_DESERIALIZE,
787 ARG_SWITCHED_ROOT,
788 ARG_DEFAULT_STD_OUTPUT,
789 ARG_DEFAULT_STD_ERROR,
790 ARG_MACHINE_ID,
791 ARG_SERVICE_WATCHDOGS,
792 };
793
794 static const struct option options[] = {
795 { "log-level", required_argument, NULL, ARG_LOG_LEVEL },
796 { "log-target", required_argument, NULL, ARG_LOG_TARGET },
797 { "log-color", optional_argument, NULL, ARG_LOG_COLOR },
798 { "log-location", optional_argument, NULL, ARG_LOG_LOCATION },
799 { "log-time", optional_argument, NULL, ARG_LOG_TIME },
800 { "unit", required_argument, NULL, ARG_UNIT },
801 { "system", no_argument, NULL, ARG_SYSTEM },
802 { "user", no_argument, NULL, ARG_USER },
803 { "test", no_argument, NULL, ARG_TEST },
804 { "no-pager", no_argument, NULL, ARG_NO_PAGER },
805 { "help", no_argument, NULL, 'h' },
806 { "version", no_argument, NULL, ARG_VERSION },
807 { "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS },
808 { "dump-bus-properties", no_argument, NULL, ARG_DUMP_BUS_PROPERTIES },
809 { "bus-introspect", required_argument, NULL, ARG_BUS_INTROSPECT },
810 { "dump-core", optional_argument, NULL, ARG_DUMP_CORE },
811 { "crash-chvt", required_argument, NULL, ARG_CRASH_CHVT },
812 { "crash-shell", optional_argument, NULL, ARG_CRASH_SHELL },
813 { "crash-reboot", optional_argument, NULL, ARG_CRASH_REBOOT },
814 { "confirm-spawn", optional_argument, NULL, ARG_CONFIRM_SPAWN },
815 { "show-status", optional_argument, NULL, ARG_SHOW_STATUS },
816 { "deserialize", required_argument, NULL, ARG_DESERIALIZE },
817 { "switched-root", no_argument, NULL, ARG_SWITCHED_ROOT },
818 { "default-standard-output", required_argument, NULL, ARG_DEFAULT_STD_OUTPUT, },
819 { "default-standard-error", required_argument, NULL, ARG_DEFAULT_STD_ERROR, },
820 { "machine-id", required_argument, NULL, ARG_MACHINE_ID },
821 { "service-watchdogs", required_argument, NULL, ARG_SERVICE_WATCHDOGS },
822 {}
823 };
824
825 int c, r;
826 bool user_arg_seen = false;
827
828 assert(argc >= 1);
829 assert(argv);
830
831 if (getpid_cached() == 1)
832 opterr = 0;
833
834 while ((c = getopt_long(argc, argv, "hDbsz:", options, NULL)) >= 0)
835
836 switch (c) {
837
838 case ARG_LOG_LEVEL:
839 r = log_set_max_level_from_string(optarg);
840 if (r < 0)
841 return log_error_errno(r, "Failed to parse log level \"%s\": %m", optarg);
842
843 break;
844
845 case ARG_LOG_TARGET:
846 r = log_set_target_from_string(optarg);
847 if (r < 0)
848 return log_error_errno(r, "Failed to parse log target \"%s\": %m", optarg);
849
850 break;
851
852 case ARG_LOG_COLOR:
853
854 if (optarg) {
855 r = log_show_color_from_string(optarg);
856 if (r < 0)
857 return log_error_errno(r, "Failed to parse log color setting \"%s\": %m",
858 optarg);
859 } else
860 log_show_color(true);
861
862 break;
863
864 case ARG_LOG_LOCATION:
865 if (optarg) {
866 r = log_show_location_from_string(optarg);
867 if (r < 0)
868 return log_error_errno(r, "Failed to parse log location setting \"%s\": %m",
869 optarg);
870 } else
871 log_show_location(true);
872
873 break;
874
875 case ARG_LOG_TIME:
876
877 if (optarg) {
878 r = log_show_time_from_string(optarg);
879 if (r < 0)
880 return log_error_errno(r, "Failed to parse log time setting \"%s\": %m",
881 optarg);
882 } else
883 log_show_time(true);
884
885 break;
886
887 case ARG_DEFAULT_STD_OUTPUT:
888 r = exec_output_from_string(optarg);
889 if (r < 0)
890 return log_error_errno(r, "Failed to parse default standard output setting \"%s\": %m",
891 optarg);
892 arg_default_std_output = r;
893 break;
894
895 case ARG_DEFAULT_STD_ERROR:
896 r = exec_output_from_string(optarg);
897 if (r < 0)
898 return log_error_errno(r, "Failed to parse default standard error output setting \"%s\": %m",
899 optarg);
900 arg_default_std_error = r;
901 break;
902
903 case ARG_UNIT:
904 r = free_and_strdup(&arg_default_unit, optarg);
905 if (r < 0)
906 return log_error_errno(r, "Failed to set default unit \"%s\": %m", optarg);
907
908 break;
909
910 case ARG_SYSTEM:
911 arg_system = true;
912 break;
913
914 case ARG_USER:
915 arg_system = false;
916 user_arg_seen = true;
917 break;
918
919 case ARG_TEST:
920 arg_action = ACTION_TEST;
921 break;
922
923 case ARG_NO_PAGER:
924 arg_pager_flags |= PAGER_DISABLE;
925 break;
926
927 case ARG_VERSION:
928 arg_action = ACTION_VERSION;
929 break;
930
931 case ARG_DUMP_CONFIGURATION_ITEMS:
932 arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
933 break;
934
935 case ARG_DUMP_BUS_PROPERTIES:
936 arg_action = ACTION_DUMP_BUS_PROPERTIES;
937 break;
938
939 case ARG_BUS_INTROSPECT:
940 arg_bus_introspect = optarg;
941 arg_action = ACTION_BUS_INTROSPECT;
942 break;
943
944 case ARG_DUMP_CORE:
945 r = parse_boolean_argument("--dump-core", optarg, &arg_dump_core);
946 if (r < 0)
947 return r;
948 break;
949
950 case ARG_CRASH_CHVT:
951 r = parse_crash_chvt(optarg, &arg_crash_chvt);
952 if (r < 0)
953 return log_error_errno(r, "Failed to parse crash virtual terminal index: \"%s\": %m",
954 optarg);
955 break;
956
957 case ARG_CRASH_SHELL:
958 r = parse_boolean_argument("--crash-shell", optarg, &arg_crash_shell);
959 if (r < 0)
960 return r;
961 break;
962
963 case ARG_CRASH_REBOOT:
964 r = parse_boolean_argument("--crash-reboot", optarg, &arg_crash_reboot);
965 if (r < 0)
966 return r;
967 break;
968
969 case ARG_CONFIRM_SPAWN:
970 arg_confirm_spawn = mfree(arg_confirm_spawn);
971
972 r = parse_confirm_spawn(optarg, &arg_confirm_spawn);
973 if (r < 0)
974 return log_error_errno(r, "Failed to parse confirm spawn option: \"%s\": %m",
975 optarg);
976 break;
977
978 case ARG_SERVICE_WATCHDOGS:
979 r = parse_boolean_argument("--service-watchdogs=", optarg, &arg_service_watchdogs);
980 if (r < 0)
981 return r;
982 break;
983
984 case ARG_SHOW_STATUS:
985 if (optarg) {
986 r = parse_show_status(optarg, &arg_show_status);
987 if (r < 0)
988 return log_error_errno(r, "Failed to parse show status boolean: \"%s\": %m",
989 optarg);
990 } else
991 arg_show_status = SHOW_STATUS_YES;
992 break;
993
994 case ARG_DESERIALIZE: {
995 int fd;
996 FILE *f;
997
998 r = safe_atoi(optarg, &fd);
999 if (r < 0)
1000 log_error_errno(r, "Failed to parse deserialize option \"%s\": %m", optarg);
1001 if (fd < 0)
1002 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1003 "Invalid deserialize fd: %d",
1004 fd);
1005
1006 (void) fd_cloexec(fd, true);
1007
1008 f = fdopen(fd, "r");
1009 if (!f)
1010 return log_error_errno(errno, "Failed to open serialization fd %d: %m", fd);
1011
1012 safe_fclose(arg_serialization);
1013 arg_serialization = f;
1014
1015 break;
1016 }
1017
1018 case ARG_SWITCHED_ROOT:
1019 arg_switched_root = true;
1020 break;
1021
1022 case ARG_MACHINE_ID:
1023 r = set_machine_id(optarg);
1024 if (r < 0)
1025 return log_error_errno(r, "MachineID '%s' is not valid: %m", optarg);
1026 break;
1027
1028 case 'h':
1029 arg_action = ACTION_HELP;
1030 break;
1031
1032 case 'D':
1033 log_set_max_level(LOG_DEBUG);
1034 break;
1035
1036 case 'b':
1037 case 's':
1038 case 'z':
1039 /* Just to eat away the sysvinit kernel cmdline args that we'll parse in
1040 * parse_proc_cmdline_item() or ignore, without any getopt() error messages.
1041 */
1042 case '?':
1043 if (getpid_cached() != 1)
1044 return -EINVAL;
1045 else
1046 return 0;
1047
1048 default:
1049 assert_not_reached();
1050 }
1051
1052 if (optind < argc && getpid_cached() != 1)
1053 /* Hmm, when we aren't run as init system let's complain about excess arguments */
1054 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Excess arguments.");
1055
1056 if (arg_action == ACTION_RUN && !arg_system && !user_arg_seen)
1057 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
1058 "Explicit --user argument required to run as user manager.");
1059
1060 return 0;
1061 }
1062
1063 static int help(void) {
1064 _cleanup_free_ char *link = NULL;
1065 int r;
1066
1067 r = terminal_urlify_man("systemd", "1", &link);
1068 if (r < 0)
1069 return log_oom();
1070
1071 printf("%s [OPTIONS...]\n\n"
1072 "%sStarts and monitors system and user services.%s\n\n"
1073 "This program takes no positional arguments.\n\n"
1074 "%sOptions%s:\n"
1075 " -h --help Show this help\n"
1076 " --version Show version\n"
1077 " --test Determine initial transaction, dump it and exit\n"
1078 " --system In combination with --test: operate as system service manager\n"
1079 " --user In combination with --test: operate as per-user service manager\n"
1080 " --no-pager Do not pipe output into a pager\n"
1081 " --dump-configuration-items Dump understood unit configuration items\n"
1082 " --dump-bus-properties Dump exposed bus properties\n"
1083 " --bus-introspect=PATH Write XML introspection data\n"
1084 " --unit=UNIT Set default unit\n"
1085 " --dump-core[=BOOL] Dump core on crash\n"
1086 " --crash-vt=NR Change to specified VT on crash\n"
1087 " --crash-reboot[=BOOL] Reboot on crash\n"
1088 " --crash-shell[=BOOL] Run shell on crash\n"
1089 " --confirm-spawn[=BOOL] Ask for confirmation when spawning processes\n"
1090 " --show-status[=BOOL] Show status updates on the console during bootup\n"
1091 " --log-target=TARGET Set log target (console, journal, kmsg, journal-or-kmsg, null)\n"
1092 " --log-level=LEVEL Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n"
1093 " --log-color[=BOOL] Highlight important log messages\n"
1094 " --log-location[=BOOL] Include code location in log messages\n"
1095 " --log-time[=BOOL] Prefix log messages with current time\n"
1096 " --default-standard-output= Set default standard output for services\n"
1097 " --default-standard-error= Set default standard error output for services\n"
1098 "\nSee the %s for details.\n",
1099 program_invocation_short_name,
1100 ansi_highlight(),
1101 ansi_normal(),
1102 ansi_underline(),
1103 ansi_normal(),
1104 link);
1105
1106 return 0;
1107 }
1108
1109 static int prepare_reexecute(
1110 Manager *m,
1111 FILE **ret_f,
1112 FDSet **ret_fds,
1113 bool switching_root) {
1114
1115 _cleanup_fdset_free_ FDSet *fds = NULL;
1116 _cleanup_fclose_ FILE *f = NULL;
1117 int r;
1118
1119 assert(m);
1120 assert(ret_f);
1121 assert(ret_fds);
1122
1123 r = manager_open_serialization(m, &f);
1124 if (r < 0)
1125 return log_error_errno(r, "Failed to create serialization file: %m");
1126
1127 /* Make sure nothing is really destructed when we shut down */
1128 m->n_reloading++;
1129 bus_manager_send_reloading(m, true);
1130
1131 fds = fdset_new();
1132 if (!fds)
1133 return log_oom();
1134
1135 r = manager_serialize(m, f, fds, switching_root);
1136 if (r < 0)
1137 return r;
1138
1139 if (fseeko(f, 0, SEEK_SET) == (off_t) -1)
1140 return log_error_errno(errno, "Failed to rewind serialization fd: %m");
1141
1142 r = fd_cloexec(fileno(f), false);
1143 if (r < 0)
1144 return log_error_errno(r, "Failed to disable O_CLOEXEC for serialization: %m");
1145
1146 r = fdset_cloexec(fds, false);
1147 if (r < 0)
1148 return log_error_errno(r, "Failed to disable O_CLOEXEC for serialization fds: %m");
1149
1150 *ret_f = TAKE_PTR(f);
1151 *ret_fds = TAKE_PTR(fds);
1152
1153 return 0;
1154 }
1155
1156 static void bump_file_max_and_nr_open(void) {
1157
1158 /* Let's bump fs.file-max and fs.nr_open to their respective maximums. On current kernels large
1159 * numbers of file descriptors are no longer a performance problem and their memory is properly
1160 * tracked by memcg, thus counting them and limiting them in another two layers of limits is
1161 * unnecessary and just complicates things. This function hence turns off 2 of the 4 levels of limits
1162 * on file descriptors, and makes RLIMIT_NOLIMIT (soft + hard) the only ones that really matter. */
1163
1164 #if BUMP_PROC_SYS_FS_FILE_MAX || BUMP_PROC_SYS_FS_NR_OPEN
1165 int r;
1166 #endif
1167
1168 #if BUMP_PROC_SYS_FS_FILE_MAX
1169 /* The maximum the kernel allows for this since 5.2 is LONG_MAX, use that. (Previously things were
1170 * different, but the operation would fail silently.) */
1171 r = sysctl_writef("fs/file-max", "%li\n", LONG_MAX);
1172 if (r < 0)
1173 log_full_errno(IN_SET(r, -EROFS, -EPERM, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, "Failed to bump fs.file-max, ignoring: %m");
1174 #endif
1175
1176 #if BUMP_PROC_SYS_FS_NR_OPEN
1177 int v = INT_MAX;
1178
1179 /* Argh! The kernel enforces maximum and minimum values on the fs.nr_open, but we don't really know
1180 * what they are. The expression by which the maximum is determined is dependent on the architecture,
1181 * and is something we don't really want to copy to userspace, as it is dependent on implementation
1182 * details of the kernel. Since the kernel doesn't expose the maximum value to us, we can only try
1183 * and hope. Hence, let's start with INT_MAX, and then keep halving the value until we find one that
1184 * works. Ugly? Yes, absolutely, but kernel APIs are kernel APIs, so what do can we do... 🤯 */
1185
1186 for (;;) {
1187 int k;
1188
1189 v &= ~(__SIZEOF_POINTER__ - 1); /* Round down to next multiple of the pointer size */
1190 if (v < 1024) {
1191 log_warning("Can't bump fs.nr_open, value too small.");
1192 break;
1193 }
1194
1195 k = read_nr_open();
1196 if (k < 0) {
1197 log_error_errno(k, "Failed to read fs.nr_open: %m");
1198 break;
1199 }
1200 if (k >= v) { /* Already larger */
1201 log_debug("Skipping bump, value is already larger.");
1202 break;
1203 }
1204
1205 r = sysctl_writef("fs/nr_open", "%i\n", v);
1206 if (r == -EINVAL) {
1207 log_debug("Couldn't write fs.nr_open as %i, halving it.", v);
1208 v /= 2;
1209 continue;
1210 }
1211 if (r < 0) {
1212 log_full_errno(IN_SET(r, -EROFS, -EPERM, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, "Failed to bump fs.nr_open, ignoring: %m");
1213 break;
1214 }
1215
1216 log_debug("Successfully bumped fs.nr_open to %i", v);
1217 break;
1218 }
1219 #endif
1220 }
1221
1222 static int bump_rlimit_nofile(const struct rlimit *saved_rlimit) {
1223 struct rlimit new_rlimit;
1224 int r, nr;
1225
1226 /* Get the underlying absolute limit the kernel enforces */
1227 nr = read_nr_open();
1228
1229 /* Calculate the new limits to use for us. Never lower from what we inherited. */
1230 new_rlimit = (struct rlimit) {
1231 .rlim_cur = MAX((rlim_t) nr, saved_rlimit->rlim_cur),
1232 .rlim_max = MAX((rlim_t) nr, saved_rlimit->rlim_max),
1233 };
1234
1235 /* Shortcut if nothing changes. */
1236 if (saved_rlimit->rlim_max >= new_rlimit.rlim_max &&
1237 saved_rlimit->rlim_cur >= new_rlimit.rlim_cur) {
1238 log_debug("RLIMIT_NOFILE is already as high or higher than we need it, not bumping.");
1239 return 0;
1240 }
1241
1242 /* Bump up the resource limit for ourselves substantially, all the way to the maximum the kernel allows, for
1243 * both hard and soft. */
1244 r = setrlimit_closest(RLIMIT_NOFILE, &new_rlimit);
1245 if (r < 0)
1246 return log_warning_errno(r, "Setting RLIMIT_NOFILE failed, ignoring: %m");
1247
1248 return 0;
1249 }
1250
1251 static int bump_rlimit_memlock(const struct rlimit *saved_rlimit) {
1252 struct rlimit new_rlimit;
1253 uint64_t mm;
1254 int r;
1255
1256 /* BPF_MAP_TYPE_LPM_TRIE bpf maps are charged against RLIMIT_MEMLOCK, even if we have CAP_IPC_LOCK
1257 * which should normally disable such checks. We need them to implement IPAddressAllow= and
1258 * IPAddressDeny=, hence let's bump the value high enough for our user. */
1259
1260 /* Using MAX() on resource limits only is safe if RLIM_INFINITY is > 0. POSIX declares that rlim_t
1261 * must be unsigned, hence this is a given, but let's make this clear here. */
1262 assert_cc(RLIM_INFINITY > 0);
1263
1264 mm = physical_memory_scale(1, 8); /* Let's scale how much we allow to be locked by the amount of
1265 * physical RAM. We allow an eighth to be locked by us, just to
1266 * pick a value. */
1267
1268 new_rlimit = (struct rlimit) {
1269 .rlim_cur = MAX3(HIGH_RLIMIT_MEMLOCK, saved_rlimit->rlim_cur, mm),
1270 .rlim_max = MAX3(HIGH_RLIMIT_MEMLOCK, saved_rlimit->rlim_max, mm),
1271 };
1272
1273 if (saved_rlimit->rlim_max >= new_rlimit.rlim_cur &&
1274 saved_rlimit->rlim_cur >= new_rlimit.rlim_max) {
1275 log_debug("RLIMIT_MEMLOCK is already as high or higher than we need it, not bumping.");
1276 return 0;
1277 }
1278
1279 r = setrlimit_closest(RLIMIT_MEMLOCK, &new_rlimit);
1280 if (r < 0)
1281 return log_warning_errno(r, "Setting RLIMIT_MEMLOCK failed, ignoring: %m");
1282
1283 return 0;
1284 }
1285
1286 static void test_usr(void) {
1287
1288 /* Check that /usr is either on the same file system as / or mounted already. */
1289
1290 if (dir_is_empty("/usr") <= 0)
1291 return;
1292
1293 log_warning("/usr appears to be on its own filesystem and is not already mounted. This is not a supported setup. "
1294 "Some things will probably break (sometimes even silently) in mysterious ways. "
1295 "Consult http://freedesktop.org/wiki/Software/systemd/separate-usr-is-broken for more information.");
1296 }
1297
1298 static int enforce_syscall_archs(Set *archs) {
1299 #if HAVE_SECCOMP
1300 int r;
1301
1302 if (!is_seccomp_available())
1303 return 0;
1304
1305 r = seccomp_restrict_archs(arg_syscall_archs);
1306 if (r < 0)
1307 return log_error_errno(r, "Failed to enforce system call architecture restrication: %m");
1308 #endif
1309 return 0;
1310 }
1311
1312 static int status_welcome(void) {
1313 _cleanup_free_ char *pretty_name = NULL, *ansi_color = NULL;
1314 int r;
1315
1316 if (!show_status_on(arg_show_status))
1317 return 0;
1318
1319 r = parse_os_release(NULL,
1320 "PRETTY_NAME", &pretty_name,
1321 "ANSI_COLOR", &ansi_color);
1322 if (r < 0)
1323 log_full_errno(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r,
1324 "Failed to read os-release file, ignoring: %m");
1325
1326 if (log_get_show_color())
1327 return status_printf(NULL, 0,
1328 "\nWelcome to \x1B[%sm%s\x1B[0m!\n",
1329 isempty(ansi_color) ? "1" : ansi_color,
1330 isempty(pretty_name) ? "Linux" : pretty_name);
1331 else
1332 return status_printf(NULL, 0,
1333 "\nWelcome to %s!\n",
1334 isempty(pretty_name) ? "Linux" : pretty_name);
1335 }
1336
1337 static int write_container_id(void) {
1338 const char *c;
1339 int r = 0; /* avoid false maybe-uninitialized warning */
1340
1341 c = getenv("container");
1342 if (isempty(c))
1343 return 0;
1344
1345 RUN_WITH_UMASK(0022)
1346 r = write_string_file("/run/systemd/container", c, WRITE_STRING_FILE_CREATE);
1347 if (r < 0)
1348 return log_warning_errno(r, "Failed to write /run/systemd/container, ignoring: %m");
1349
1350 return 1;
1351 }
1352
1353 static int bump_unix_max_dgram_qlen(void) {
1354 _cleanup_free_ char *qlen = NULL;
1355 unsigned long v;
1356 int r;
1357
1358 /* Let's bump the net.unix.max_dgram_qlen sysctl. The kernel default of 16 is simply too low. We set
1359 * the value really really early during boot, so that it is actually applied to all our sockets,
1360 * including the $NOTIFY_SOCKET one. */
1361
1362 r = read_one_line_file("/proc/sys/net/unix/max_dgram_qlen", &qlen);
1363 if (r < 0)
1364 return log_full_errno(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r,
1365 "Failed to read AF_UNIX datagram queue length, ignoring: %m");
1366
1367 r = safe_atolu(qlen, &v);
1368 if (r < 0)
1369 return log_warning_errno(r, "Failed to parse AF_UNIX datagram queue length '%s', ignoring: %m", qlen);
1370
1371 if (v >= DEFAULT_UNIX_MAX_DGRAM_QLEN)
1372 return 0;
1373
1374 r = write_string_filef("/proc/sys/net/unix/max_dgram_qlen", WRITE_STRING_FILE_DISABLE_BUFFER,
1375 "%lu", DEFAULT_UNIX_MAX_DGRAM_QLEN);
1376 if (r < 0)
1377 return log_full_errno(IN_SET(r, -EROFS, -EPERM, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
1378 "Failed to bump AF_UNIX datagram queue length, ignoring: %m");
1379
1380 return 1;
1381 }
1382
1383 static int fixup_environment(void) {
1384 _cleanup_free_ char *term = NULL;
1385 const char *t;
1386 int r;
1387
1388 /* Only fix up the environment when we are started as PID 1 */
1389 if (getpid_cached() != 1)
1390 return 0;
1391
1392 /* We expect the environment to be set correctly if run inside a container. */
1393 if (detect_container() > 0)
1394 return 0;
1395
1396 /* When started as PID1, the kernel uses /dev/console for our stdios and uses TERM=linux whatever the
1397 * backend device used by the console. We try to make a better guess here since some consoles might
1398 * not have support for color mode for example.
1399 *
1400 * However if TERM was configured through the kernel command line then leave it alone. */
1401 r = proc_cmdline_get_key("TERM", 0, &term);
1402 if (r < 0)
1403 return r;
1404
1405 t = term ?: default_term_for_tty("/dev/console");
1406
1407 if (setenv("TERM", t, 1) < 0)
1408 return -errno;
1409
1410 /* The kernels sets HOME=/ for init. Let's undo this. */
1411 if (path_equal_ptr(getenv("HOME"), "/"))
1412 assert_se(unsetenv("HOME") == 0);
1413
1414 return 0;
1415 }
1416
1417 static void redirect_telinit(int argc, char *argv[]) {
1418
1419 /* This is compatibility support for SysV, where calling init as a user is identical to telinit. */
1420
1421 #if HAVE_SYSV_COMPAT
1422 if (getpid_cached() == 1)
1423 return;
1424
1425 if (!invoked_as(argv, "init"))
1426 return;
1427
1428 execv(SYSTEMCTL_BINARY_PATH, argv);
1429 log_error_errno(errno, "Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
1430 exit(EXIT_FAILURE);
1431 #endif
1432 }
1433
1434 static int become_shutdown(
1435 const char *shutdown_verb,
1436 int retval) {
1437
1438 char log_level[DECIMAL_STR_MAX(int) + 1],
1439 exit_code[DECIMAL_STR_MAX(uint8_t) + 1],
1440 timeout[DECIMAL_STR_MAX(usec_t) + 1];
1441
1442 const char* command_line[13] = {
1443 SYSTEMD_SHUTDOWN_BINARY_PATH,
1444 shutdown_verb,
1445 "--timeout", timeout,
1446 "--log-level", log_level,
1447 "--log-target",
1448 };
1449
1450 _cleanup_strv_free_ char **env_block = NULL;
1451 usec_t watchdog_timer = 0;
1452 size_t pos = 7;
1453 int r;
1454
1455 assert(shutdown_verb);
1456 assert(!command_line[pos]);
1457 env_block = strv_copy(environ);
1458
1459 xsprintf(log_level, "%d", log_get_max_level());
1460 xsprintf(timeout, "%" PRI_USEC "us", arg_default_timeout_stop_usec);
1461
1462 switch (log_get_target()) {
1463
1464 case LOG_TARGET_KMSG:
1465 case LOG_TARGET_JOURNAL_OR_KMSG:
1466 case LOG_TARGET_SYSLOG_OR_KMSG:
1467 command_line[pos++] = "kmsg";
1468 break;
1469
1470 case LOG_TARGET_NULL:
1471 command_line[pos++] = "null";
1472 break;
1473
1474 case LOG_TARGET_CONSOLE:
1475 default:
1476 command_line[pos++] = "console";
1477 break;
1478 };
1479
1480 if (log_get_show_color())
1481 command_line[pos++] = "--log-color";
1482
1483 if (log_get_show_location())
1484 command_line[pos++] = "--log-location";
1485
1486 if (log_get_show_time())
1487 command_line[pos++] = "--log-time";
1488
1489 if (streq(shutdown_verb, "exit")) {
1490 command_line[pos++] = "--exit-code";
1491 command_line[pos++] = exit_code;
1492 xsprintf(exit_code, "%d", retval);
1493 }
1494
1495 assert(pos < ELEMENTSOF(command_line));
1496
1497 if (streq(shutdown_verb, "reboot"))
1498 watchdog_timer = arg_reboot_watchdog;
1499 else if (streq(shutdown_verb, "kexec"))
1500 watchdog_timer = arg_kexec_watchdog;
1501
1502 /* If we reboot or kexec let's set the shutdown watchdog and tell the
1503 * shutdown binary to repeatedly ping it.
1504 * Disable the pretimeout watchdog, as we do not support it from the shutdown binary. */
1505 (void) watchdog_setup_pretimeout(0);
1506 (void) watchdog_setup_pretimeout_governor(NULL);
1507 r = watchdog_setup(watchdog_timer);
1508 watchdog_close(r < 0);
1509
1510 /* Tell the binary how often to ping, ignore failure */
1511 (void) strv_extendf(&env_block, "WATCHDOG_USEC="USEC_FMT, watchdog_timer);
1512
1513 if (arg_watchdog_device)
1514 (void) strv_extendf(&env_block, "WATCHDOG_DEVICE=%s", arg_watchdog_device);
1515
1516 /* Avoid the creation of new processes forked by the kernel; at this
1517 * point, we will not listen to the signals anyway */
1518 if (detect_container() <= 0)
1519 (void) cg_uninstall_release_agent(SYSTEMD_CGROUP_CONTROLLER);
1520
1521 execve(SYSTEMD_SHUTDOWN_BINARY_PATH, (char **) command_line, env_block);
1522 return -errno;
1523 }
1524
1525 static void initialize_clock(void) {
1526 int r;
1527
1528 /* This is called very early on, before we parse the kernel command line or otherwise figure out why
1529 * we are running, but only once. */
1530
1531 if (clock_is_localtime(NULL) > 0) {
1532 int min;
1533
1534 /* The very first call of settimeofday() also does a time warp in the kernel.
1535 *
1536 * In the rtc-in-local time mode, we set the kernel's timezone, and rely on external tools to
1537 * take care of maintaining the RTC and do all adjustments. This matches the behavior of
1538 * Windows, which leaves the RTC alone if the registry tells that the RTC runs in UTC.
1539 */
1540 r = clock_set_timezone(&min);
1541 if (r < 0)
1542 log_error_errno(r, "Failed to apply local time delta, ignoring: %m");
1543 else
1544 log_info("RTC configured in localtime, applying delta of %i minutes to system time.", min);
1545
1546 } else if (!in_initrd())
1547 /*
1548 * Do a dummy very first call to seal the kernel's time warp magic.
1549 *
1550 * Do not call this from inside the initrd. The initrd might not carry /etc/adjtime with
1551 * LOCAL, but the real system could be set up that way. In such case, we need to delay the
1552 * time-warp or the sealing until we reach the real system.
1553 *
1554 * Do no set the kernel's timezone. The concept of local time cannot be supported reliably,
1555 * the time will jump or be incorrect at every daylight saving time change. All kernel local
1556 * time concepts will be treated as UTC that way.
1557 */
1558 (void) clock_reset_timewarp();
1559
1560 ClockChangeDirection change_dir;
1561 r = clock_apply_epoch(&change_dir);
1562 if (r > 0 && change_dir == CLOCK_CHANGE_FORWARD)
1563 log_info("System time before build time, advancing clock.");
1564 else if (r > 0 && change_dir == CLOCK_CHANGE_BACKWARD)
1565 log_info("System time is further ahead than %s after build time, resetting clock to build time.",
1566 FORMAT_TIMESPAN(CLOCK_VALID_RANGE_USEC_MAX, USEC_PER_DAY));
1567 else if (r < 0 && change_dir == CLOCK_CHANGE_FORWARD)
1568 log_error_errno(r, "Current system time is before build time, but cannot correct: %m");
1569 else if (r < 0 && change_dir == CLOCK_CHANGE_BACKWARD)
1570 log_error_errno(r, "Current system time is further ahead %s after build time, but cannot correct: %m",
1571 FORMAT_TIMESPAN(CLOCK_VALID_RANGE_USEC_MAX, USEC_PER_DAY));
1572 }
1573
1574 static void apply_clock_update(void) {
1575 /* This is called later than initialize_clock(), i.e. after we parsed configuration files/kernel
1576 * command line and such. */
1577
1578 if (arg_clock_usec == 0)
1579 return;
1580
1581 if (getpid_cached() != 1)
1582 return;
1583
1584 if (clock_settime(CLOCK_REALTIME, TIMESPEC_STORE(arg_clock_usec)) < 0)
1585 log_error_errno(errno, "Failed to set system clock to time specified on kernel command line: %m");
1586 else
1587 log_info("Set system clock to %s, as specified on the kernel command line.",
1588 FORMAT_TIMESTAMP(arg_clock_usec));
1589 }
1590
1591 static void cmdline_take_random_seed(void) {
1592 size_t suggested;
1593 int r;
1594
1595 if (arg_random_seed_size == 0)
1596 return;
1597
1598 if (getpid_cached() != 1)
1599 return;
1600
1601 assert(arg_random_seed);
1602 suggested = random_pool_size();
1603
1604 if (arg_random_seed_size < suggested)
1605 log_warning("Random seed specified on kernel command line has size %zu, but %zu bytes required to fill entropy pool.",
1606 arg_random_seed_size, suggested);
1607
1608 r = random_write_entropy(-1, arg_random_seed, arg_random_seed_size, true);
1609 if (r < 0) {
1610 log_warning_errno(r, "Failed to credit entropy specified on kernel command line, ignoring: %m");
1611 return;
1612 }
1613
1614 log_notice("Successfully credited entropy passed on kernel command line.\n"
1615 "Note that the seed provided this way is accessible to unprivileged programs. "
1616 "This functionality should not be used outside of testing environments.");
1617 }
1618
1619 static void initialize_coredump(bool skip_setup) {
1620 #if ENABLE_COREDUMP
1621 if (getpid_cached() != 1)
1622 return;
1623
1624 /* Don't limit the core dump size, so that coredump handlers such as systemd-coredump (which honour
1625 * the limit) will process core dumps for system services by default. */
1626 if (setrlimit(RLIMIT_CORE, &RLIMIT_MAKE_CONST(RLIM_INFINITY)) < 0)
1627 log_warning_errno(errno, "Failed to set RLIMIT_CORE: %m");
1628
1629 /* But at the same time, turn off the core_pattern logic by default, so that no coredumps are stored
1630 * until the systemd-coredump tool is enabled via sysctl. However it can be changed via the kernel
1631 * command line later so core dumps can still be generated during early startup and in initramfs. */
1632 if (!skip_setup)
1633 disable_coredumps();
1634 #endif
1635 }
1636
1637 static void initialize_core_pattern(bool skip_setup) {
1638 int r;
1639
1640 if (skip_setup || !arg_early_core_pattern)
1641 return;
1642
1643 if (getpid_cached() != 1)
1644 return;
1645
1646 r = write_string_file("/proc/sys/kernel/core_pattern", arg_early_core_pattern, WRITE_STRING_FILE_DISABLE_BUFFER);
1647 if (r < 0)
1648 log_warning_errno(r, "Failed to write '%s' to /proc/sys/kernel/core_pattern, ignoring: %m",
1649 arg_early_core_pattern);
1650 }
1651
1652 static void update_cpu_affinity(bool skip_setup) {
1653 _cleanup_free_ char *mask = NULL;
1654
1655 if (skip_setup || !arg_cpu_affinity.set)
1656 return;
1657
1658 assert(arg_cpu_affinity.allocated > 0);
1659
1660 mask = cpu_set_to_range_string(&arg_cpu_affinity);
1661 log_debug("Setting CPU affinity to {%s}.", strnull(mask));
1662
1663 if (sched_setaffinity(0, arg_cpu_affinity.allocated, arg_cpu_affinity.set) < 0)
1664 log_warning_errno(errno, "Failed to set CPU affinity, ignoring: %m");
1665 }
1666
1667 static void update_numa_policy(bool skip_setup) {
1668 int r;
1669 _cleanup_free_ char *nodes = NULL;
1670 const char * policy = NULL;
1671
1672 if (skip_setup || !mpol_is_valid(numa_policy_get_type(&arg_numa_policy)))
1673 return;
1674
1675 if (DEBUG_LOGGING) {
1676 policy = mpol_to_string(numa_policy_get_type(&arg_numa_policy));
1677 nodes = cpu_set_to_range_string(&arg_numa_policy.nodes);
1678 log_debug("Setting NUMA policy to %s, with nodes {%s}.", strnull(policy), strnull(nodes));
1679 }
1680
1681 r = apply_numa_policy(&arg_numa_policy);
1682 if (r == -EOPNOTSUPP)
1683 log_debug_errno(r, "NUMA support not available, ignoring.");
1684 else if (r < 0)
1685 log_warning_errno(r, "Failed to set NUMA memory policy, ignoring: %m");
1686 }
1687
1688 static void filter_args(
1689 const char* dst[],
1690 size_t *dst_index,
1691 char **src,
1692 int argc) {
1693
1694 assert(dst);
1695 assert(dst_index);
1696
1697 /* Copy some filtered arguments into the dst array from src. */
1698 for (int i = 1; i < argc; i++) {
1699 if (STR_IN_SET(src[i],
1700 "--switched-root",
1701 "--system",
1702 "--user"))
1703 continue;
1704
1705 if (startswith(src[i], "--deserialize="))
1706 continue;
1707 if (streq(src[i], "--deserialize")) {
1708 i++; /* Skip the argument too */
1709 continue;
1710 }
1711
1712 /* Skip target unit designators. We already acted upon this information and have queued
1713 * appropriate jobs. We don't want to redo all this after reexecution. */
1714 if (startswith(src[i], "--unit="))
1715 continue;
1716 if (streq(src[i], "--unit")) {
1717 i++; /* Skip the argument too */
1718 continue;
1719 }
1720
1721 if (startswith(src[i],
1722 in_initrd() ? "rd.systemd.unit=" : "systemd.unit="))
1723 continue;
1724
1725 if (runlevel_to_target(src[i]))
1726 continue;
1727
1728 /* Seems we have a good old option. Let's pass it over to the new instance. */
1729 dst[(*dst_index)++] = src[i];
1730 }
1731 }
1732
1733 static int do_reexecute(
1734 ManagerObjective objective,
1735 int argc,
1736 char* argv[],
1737 const struct rlimit *saved_rlimit_nofile,
1738 const struct rlimit *saved_rlimit_memlock,
1739 FDSet *fds,
1740 const char *switch_root_dir,
1741 const char *switch_root_init,
1742 const char **ret_error_message) {
1743
1744 size_t i, args_size;
1745 const char **args;
1746 int r;
1747
1748 assert(IN_SET(objective, MANAGER_REEXECUTE, MANAGER_SWITCH_ROOT));
1749 assert(argc >= 0);
1750 assert(saved_rlimit_nofile);
1751 assert(saved_rlimit_memlock);
1752 assert(ret_error_message);
1753
1754 /* Close and disarm the watchdog, so that the new instance can reinitialize it, but doesn't get
1755 * rebooted while we do that */
1756 watchdog_close(true);
1757
1758 /* Reset RLIMIT_NOFILE + RLIMIT_MEMLOCK back to the kernel defaults, so that the new systemd can pass
1759 * the kernel default to its child processes */
1760 if (saved_rlimit_nofile->rlim_cur != 0)
1761 (void) setrlimit(RLIMIT_NOFILE, saved_rlimit_nofile);
1762 if (saved_rlimit_memlock->rlim_cur != RLIM_INFINITY)
1763 (void) setrlimit(RLIMIT_MEMLOCK, saved_rlimit_memlock);
1764
1765 if (switch_root_dir) {
1766 /* Kill all remaining processes from the initrd, but don't wait for them, so that we can
1767 * handle the SIGCHLD for them after deserializing. */
1768 broadcast_signal(SIGTERM, false, true, arg_default_timeout_stop_usec);
1769
1770 /* And switch root with MS_MOVE, because we remove the old directory afterwards and detach it. */
1771 r = switch_root(switch_root_dir, "/mnt", true, MS_MOVE);
1772 if (r < 0)
1773 log_error_errno(r, "Failed to switch root, trying to continue: %m");
1774 }
1775
1776 args_size = argc + 6;
1777 args = newa(const char*, args_size);
1778
1779 if (!switch_root_init) {
1780 char sfd[DECIMAL_STR_MAX(int)];
1781
1782 /* First try to spawn ourselves with the right path, and with full serialization. We do this
1783 * only if the user didn't specify an explicit init to spawn. */
1784
1785 assert(arg_serialization);
1786 assert(fds);
1787
1788 xsprintf(sfd, "%i", fileno(arg_serialization));
1789
1790 i = 1; /* Leave args[0] empty for now. */
1791 filter_args(args, &i, argv, argc);
1792
1793 if (switch_root_dir)
1794 args[i++] = "--switched-root";
1795 args[i++] = arg_system ? "--system" : "--user";
1796 args[i++] = "--deserialize";
1797 args[i++] = sfd;
1798 args[i++] = NULL;
1799
1800 assert(i <= args_size);
1801
1802 /*
1803 * We want valgrind to print its memory usage summary before reexecution. Valgrind won't do
1804 * this is on its own on exec(), but it will do it on exit(). Hence, to ensure we get a
1805 * summary here, fork() off a child, let it exit() cleanly, so that it prints the summary,
1806 * and wait() for it in the parent, before proceeding into the exec().
1807 */
1808 valgrind_summary_hack();
1809
1810 args[0] = SYSTEMD_BINARY_PATH;
1811 (void) execv(args[0], (char* const*) args);
1812
1813 if (objective == MANAGER_REEXECUTE) {
1814 *ret_error_message = "Failed to execute our own binary";
1815 return log_error_errno(errno, "Failed to execute our own binary %s: %m", args[0]);
1816 }
1817
1818 log_debug_errno(errno, "Failed to execute our own binary %s, trying fallback: %m", args[0]);
1819 }
1820
1821 /* Try the fallback, if there is any, without any serialization. We pass the original argv[] and
1822 * envp[]. (Well, modulo the ordering changes due to getopt() in argv[], and some cleanups in envp[],
1823 * but let's hope that doesn't matter.) */
1824
1825 arg_serialization = safe_fclose(arg_serialization);
1826 fds = fdset_free(fds);
1827
1828 /* Reopen the console */
1829 (void) make_console_stdio();
1830
1831 i = 1; /* Leave args[0] empty for now. */
1832 for (int j = 1; j <= argc; j++)
1833 args[i++] = argv[j];
1834 assert(i <= args_size);
1835
1836 /* Re-enable any blocked signals, especially important if we switch from initial ramdisk to init=... */
1837 (void) reset_all_signal_handlers();
1838 (void) reset_signal_mask();
1839 (void) rlimit_nofile_safe();
1840
1841 if (switch_root_init) {
1842 args[0] = switch_root_init;
1843 (void) execve(args[0], (char* const*) args, saved_env);
1844 log_warning_errno(errno, "Failed to execute configured init %s, trying fallback: %m", args[0]);
1845 }
1846
1847 args[0] = "/sbin/init";
1848 (void) execv(args[0], (char* const*) args);
1849 r = -errno;
1850
1851 manager_status_printf(NULL, STATUS_TYPE_EMERGENCY,
1852 ANSI_HIGHLIGHT_RED " !! " ANSI_NORMAL,
1853 "Failed to execute /sbin/init");
1854
1855 *ret_error_message = "Failed to execute fallback shell";
1856 if (r == -ENOENT) {
1857 log_warning("No /sbin/init, trying fallback");
1858
1859 args[0] = "/bin/sh";
1860 args[1] = NULL;
1861 (void) execve(args[0], (char* const*) args, saved_env);
1862 return log_error_errno(errno, "Failed to execute /bin/sh, giving up: %m");
1863 } else
1864 return log_error_errno(r, "Failed to execute /sbin/init, giving up: %m");
1865 }
1866
1867 static int invoke_main_loop(
1868 Manager *m,
1869 const struct rlimit *saved_rlimit_nofile,
1870 const struct rlimit *saved_rlimit_memlock,
1871 int *ret_retval, /* Return parameters relevant for shutting down */
1872 const char **ret_shutdown_verb, /* … */
1873 FDSet **ret_fds, /* Return parameters for reexecuting */
1874 char **ret_switch_root_dir, /* … */
1875 char **ret_switch_root_init, /* … */
1876 const char **ret_error_message) {
1877
1878 int r;
1879
1880 assert(m);
1881 assert(saved_rlimit_nofile);
1882 assert(saved_rlimit_memlock);
1883 assert(ret_retval);
1884 assert(ret_shutdown_verb);
1885 assert(ret_fds);
1886 assert(ret_switch_root_dir);
1887 assert(ret_switch_root_init);
1888 assert(ret_error_message);
1889
1890 for (;;) {
1891 int objective = manager_loop(m);
1892 if (objective < 0) {
1893 *ret_error_message = "Failed to run main loop";
1894 return log_emergency_errno(objective, "Failed to run main loop: %m");
1895 }
1896
1897 switch (objective) {
1898
1899 case MANAGER_RELOAD: {
1900 LogTarget saved_log_target;
1901 int saved_log_level;
1902
1903 log_info("Reloading.");
1904
1905 /* First, save any overridden log level/target, then parse the configuration file,
1906 * which might change the log level to new settings. */
1907
1908 saved_log_level = m->log_level_overridden ? log_get_max_level() : -1;
1909 saved_log_target = m->log_target_overridden ? log_get_target() : _LOG_TARGET_INVALID;
1910
1911 (void) parse_configuration(saved_rlimit_nofile, saved_rlimit_memlock);
1912
1913 set_manager_defaults(m);
1914 set_manager_settings(m);
1915
1916 update_cpu_affinity(false);
1917 update_numa_policy(false);
1918
1919 if (saved_log_level >= 0)
1920 manager_override_log_level(m, saved_log_level);
1921 if (saved_log_target >= 0)
1922 manager_override_log_target(m, saved_log_target);
1923
1924 if (manager_reload(m) < 0)
1925 /* Reloading failed before the point of no return.
1926 * Let's continue running as if nothing happened. */
1927 m->objective = MANAGER_OK;
1928
1929 continue;
1930 }
1931
1932 case MANAGER_REEXECUTE:
1933 r = prepare_reexecute(m, &arg_serialization, ret_fds, false);
1934 if (r < 0) {
1935 *ret_error_message = "Failed to prepare for reexecution";
1936 return r;
1937 }
1938
1939 log_notice("Reexecuting.");
1940
1941 *ret_retval = EXIT_SUCCESS;
1942 *ret_shutdown_verb = NULL;
1943 *ret_switch_root_dir = *ret_switch_root_init = NULL;
1944
1945 return objective;
1946
1947 case MANAGER_SWITCH_ROOT:
1948 if (!m->switch_root_init) {
1949 r = prepare_reexecute(m, &arg_serialization, ret_fds, true);
1950 if (r < 0) {
1951 *ret_error_message = "Failed to prepare for reexecution";
1952 return r;
1953 }
1954 } else
1955 *ret_fds = NULL;
1956
1957 log_notice("Switching root.");
1958
1959 *ret_retval = EXIT_SUCCESS;
1960 *ret_shutdown_verb = NULL;
1961
1962 /* Steal the switch root parameters */
1963 *ret_switch_root_dir = TAKE_PTR(m->switch_root);
1964 *ret_switch_root_init = TAKE_PTR(m->switch_root_init);
1965
1966 return objective;
1967
1968 case MANAGER_EXIT:
1969 if (MANAGER_IS_USER(m)) {
1970 log_debug("Exit.");
1971
1972 *ret_retval = m->return_value;
1973 *ret_shutdown_verb = NULL;
1974 *ret_fds = NULL;
1975 *ret_switch_root_dir = *ret_switch_root_init = NULL;
1976
1977 return objective;
1978 }
1979
1980 _fallthrough_;
1981 case MANAGER_REBOOT:
1982 case MANAGER_POWEROFF:
1983 case MANAGER_HALT:
1984 case MANAGER_KEXEC: {
1985 static const char* const table[_MANAGER_OBJECTIVE_MAX] = {
1986 [MANAGER_EXIT] = "exit",
1987 [MANAGER_REBOOT] = "reboot",
1988 [MANAGER_POWEROFF] = "poweroff",
1989 [MANAGER_HALT] = "halt",
1990 [MANAGER_KEXEC] = "kexec",
1991 };
1992
1993 log_notice("Shutting down.");
1994
1995 *ret_retval = m->return_value;
1996 assert_se(*ret_shutdown_verb = table[m->objective]);
1997 *ret_fds = NULL;
1998 *ret_switch_root_dir = *ret_switch_root_init = NULL;
1999
2000 return objective;
2001 }
2002
2003 default:
2004 assert_not_reached();
2005 }
2006 }
2007 }
2008
2009 static void log_execution_mode(bool *ret_first_boot) {
2010 assert(ret_first_boot);
2011
2012 if (arg_system) {
2013 struct utsname uts;
2014 int v;
2015
2016 log_info("systemd " GIT_VERSION " running in %ssystem mode (%s)",
2017 arg_action == ACTION_TEST ? "test " : "",
2018 systemd_features);
2019
2020 v = detect_virtualization();
2021 if (v > 0)
2022 log_info("Detected virtualization %s.", virtualization_to_string(v));
2023
2024 log_info("Detected architecture %s.", architecture_to_string(uname_architecture()));
2025
2026 if (in_initrd()) {
2027 *ret_first_boot = false;
2028 log_info("Running in initial RAM disk.");
2029 } else {
2030 int r;
2031 _cleanup_free_ char *id_text = NULL;
2032
2033 /* Let's check whether we are in first boot. We use /etc/machine-id as flag file
2034 * for this: If it is missing or contains the value "uninitialized", this is the
2035 * first boot. In any other case, it is not. This allows container managers and
2036 * installers to provision a couple of files already. If the container manager
2037 * wants to provision the machine ID itself it should pass $container_uuid to PID 1. */
2038
2039 r = read_one_line_file("/etc/machine-id", &id_text);
2040 if (r < 0 || streq(id_text, "uninitialized")) {
2041 if (r < 0 && r != -ENOENT)
2042 log_warning_errno(r, "Unexpected error while reading /etc/machine-id, ignoring: %m");
2043
2044 *ret_first_boot = true;
2045 log_info("Detected first boot.");
2046 } else {
2047 *ret_first_boot = false;
2048 log_debug("Detected initialized system, this is not the first boot.");
2049 }
2050 }
2051
2052 assert(uname(&uts) >= 0);
2053
2054 if (strverscmp_improved(uts.release, KERNEL_BASELINE_VERSION) < 0)
2055 log_warning("Warning! Reported kernel version %s is older than systemd's required baseline kernel version %s. "
2056 "Your mileage may vary.", uts.release, KERNEL_BASELINE_VERSION);
2057 else
2058 log_debug("Kernel version %s, our baseline is %s", uts.release, KERNEL_BASELINE_VERSION);
2059 } else {
2060 if (DEBUG_LOGGING) {
2061 _cleanup_free_ char *t = NULL;
2062
2063 t = uid_to_name(getuid());
2064 log_debug("systemd " GIT_VERSION " running in %suser mode for user " UID_FMT "/%s. (%s)",
2065 arg_action == ACTION_TEST ? " test" : "",
2066 getuid(), strna(t), systemd_features);
2067 }
2068
2069 *ret_first_boot = false;
2070 }
2071 }
2072
2073 static int initialize_runtime(
2074 bool skip_setup,
2075 bool first_boot,
2076 struct rlimit *saved_rlimit_nofile,
2077 struct rlimit *saved_rlimit_memlock,
2078 const char **ret_error_message) {
2079 int r;
2080
2081 assert(ret_error_message);
2082
2083 /* Sets up various runtime parameters. Many of these initializations are conditionalized:
2084 *
2085 * - Some only apply to --system instances
2086 * - Some only apply to --user instances
2087 * - Some only apply when we first start up, but not when we reexecute
2088 */
2089
2090 if (arg_action != ACTION_RUN)
2091 return 0;
2092
2093 update_cpu_affinity(skip_setup);
2094 update_numa_policy(skip_setup);
2095
2096 if (arg_system) {
2097 /* Make sure we leave a core dump without panicking the kernel. */
2098 install_crash_handler();
2099
2100 if (!skip_setup) {
2101 r = mount_cgroup_controllers();
2102 if (r < 0) {
2103 *ret_error_message = "Failed to mount cgroup hierarchies";
2104 return r;
2105 }
2106
2107 status_welcome();
2108 (void) hostname_setup(true);
2109 /* Force transient machine-id on first boot. */
2110 machine_id_setup(NULL, first_boot, arg_machine_id, NULL);
2111 (void) loopback_setup();
2112 bump_unix_max_dgram_qlen();
2113 bump_file_max_and_nr_open();
2114 test_usr();
2115 write_container_id();
2116 }
2117
2118 if (arg_watchdog_device) {
2119 r = watchdog_set_device(arg_watchdog_device);
2120 if (r < 0)
2121 log_warning_errno(r, "Failed to set watchdog device to %s, ignoring: %m", arg_watchdog_device);
2122 }
2123 } else {
2124 _cleanup_free_ char *p = NULL;
2125
2126 /* Create the runtime directory and place the inaccessible device nodes there, if we run in
2127 * user mode. In system mode mount_setup() already did that. */
2128
2129 r = xdg_user_runtime_dir(&p, "/systemd");
2130 if (r < 0) {
2131 *ret_error_message = "$XDG_RUNTIME_DIR is not set";
2132 return log_emergency_errno(r, "Failed to determine $XDG_RUNTIME_DIR path: %m");
2133 }
2134
2135 (void) mkdir_p_label(p, 0755);
2136 (void) make_inaccessible_nodes(p, UID_INVALID, GID_INVALID);
2137 }
2138
2139 if (arg_timer_slack_nsec != NSEC_INFINITY)
2140 if (prctl(PR_SET_TIMERSLACK, arg_timer_slack_nsec) < 0)
2141 log_warning_errno(errno, "Failed to adjust timer slack, ignoring: %m");
2142
2143 if (arg_system && !cap_test_all(arg_capability_bounding_set)) {
2144 r = capability_bounding_set_drop_usermode(arg_capability_bounding_set);
2145 if (r < 0) {
2146 *ret_error_message = "Failed to drop capability bounding set of usermode helpers";
2147 return log_emergency_errno(r, "Failed to drop capability bounding set of usermode helpers: %m");
2148 }
2149
2150 r = capability_bounding_set_drop(arg_capability_bounding_set, true);
2151 if (r < 0) {
2152 *ret_error_message = "Failed to drop capability bounding set";
2153 return log_emergency_errno(r, "Failed to drop capability bounding set: %m");
2154 }
2155 }
2156
2157 if (arg_system && arg_no_new_privs) {
2158 if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0) {
2159 *ret_error_message = "Failed to disable new privileges";
2160 return log_emergency_errno(errno, "Failed to disable new privileges: %m");
2161 }
2162 }
2163
2164 if (arg_syscall_archs) {
2165 r = enforce_syscall_archs(arg_syscall_archs);
2166 if (r < 0) {
2167 *ret_error_message = "Failed to set syscall architectures";
2168 return r;
2169 }
2170 }
2171
2172 if (!arg_system)
2173 /* Become reaper of our children */
2174 if (prctl(PR_SET_CHILD_SUBREAPER, 1) < 0)
2175 log_warning_errno(errno, "Failed to make us a subreaper, ignoring: %m");
2176
2177 /* Bump up RLIMIT_NOFILE for systemd itself */
2178 (void) bump_rlimit_nofile(saved_rlimit_nofile);
2179 (void) bump_rlimit_memlock(saved_rlimit_memlock);
2180
2181 return 0;
2182 }
2183
2184 static int do_queue_default_job(
2185 Manager *m,
2186 const char **ret_error_message) {
2187
2188 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2189 const char *unit;
2190 Job *job;
2191 Unit *target;
2192 int r;
2193
2194 if (arg_default_unit)
2195 unit = arg_default_unit;
2196 else if (in_initrd())
2197 unit = SPECIAL_INITRD_TARGET;
2198 else
2199 unit = SPECIAL_DEFAULT_TARGET;
2200
2201 log_debug("Activating default unit: %s", unit);
2202
2203 r = manager_load_startable_unit_or_warn(m, unit, NULL, &target);
2204 if (r < 0 && in_initrd() && !arg_default_unit) {
2205 /* Fall back to default.target, which we used to always use by default. Only do this if no
2206 * explicit configuration was given. */
2207
2208 log_info("Falling back to " SPECIAL_DEFAULT_TARGET ".");
2209
2210 r = manager_load_startable_unit_or_warn(m, SPECIAL_DEFAULT_TARGET, NULL, &target);
2211 }
2212 if (r < 0) {
2213 log_info("Falling back to " SPECIAL_RESCUE_TARGET ".");
2214
2215 r = manager_load_startable_unit_or_warn(m, SPECIAL_RESCUE_TARGET, NULL, &target);
2216 if (r < 0) {
2217 *ret_error_message = r == -ERFKILL ? SPECIAL_RESCUE_TARGET " masked"
2218 : "Failed to load " SPECIAL_RESCUE_TARGET;
2219 return r;
2220 }
2221 }
2222
2223 assert(target->load_state == UNIT_LOADED);
2224
2225 r = manager_add_job(m, JOB_START, target, JOB_ISOLATE, NULL, &error, &job);
2226 if (r == -EPERM) {
2227 log_debug_errno(r, "Default target could not be isolated, starting instead: %s", bus_error_message(&error, r));
2228
2229 sd_bus_error_free(&error);
2230
2231 r = manager_add_job(m, JOB_START, target, JOB_REPLACE, NULL, &error, &job);
2232 if (r < 0) {
2233 *ret_error_message = "Failed to start default target";
2234 return log_emergency_errno(r, "Failed to start default target: %s", bus_error_message(&error, r));
2235 }
2236
2237 } else if (r < 0) {
2238 *ret_error_message = "Failed to isolate default target";
2239 return log_emergency_errno(r, "Failed to isolate default target: %s", bus_error_message(&error, r));
2240 } else
2241 log_info("Queued %s job for default target %s.",
2242 job_type_to_string(job->type),
2243 unit_status_string(job->unit, NULL));
2244
2245 m->default_unit_job_id = job->id;
2246
2247 return 0;
2248 }
2249
2250 static void save_rlimits(struct rlimit *saved_rlimit_nofile,
2251 struct rlimit *saved_rlimit_memlock) {
2252
2253 assert(saved_rlimit_nofile);
2254 assert(saved_rlimit_memlock);
2255
2256 if (getrlimit(RLIMIT_NOFILE, saved_rlimit_nofile) < 0)
2257 log_warning_errno(errno, "Reading RLIMIT_NOFILE failed, ignoring: %m");
2258
2259 if (getrlimit(RLIMIT_MEMLOCK, saved_rlimit_memlock) < 0)
2260 log_warning_errno(errno, "Reading RLIMIT_MEMLOCK failed, ignoring: %m");
2261 }
2262
2263 static void fallback_rlimit_nofile(const struct rlimit *saved_rlimit_nofile) {
2264 struct rlimit *rl;
2265
2266 if (arg_default_rlimit[RLIMIT_NOFILE])
2267 return;
2268
2269 /* Make sure forked processes get limits based on the original kernel setting */
2270
2271 rl = newdup(struct rlimit, saved_rlimit_nofile, 1);
2272 if (!rl) {
2273 log_oom();
2274 return;
2275 }
2276
2277 /* Bump the hard limit for system services to a substantially higher value. The default
2278 * hard limit current kernels set is pretty low (4K), mostly for historical
2279 * reasons. According to kernel developers, the fd handling in recent kernels has been
2280 * optimized substantially enough, so that we can bump the limit now, without paying too
2281 * high a price in memory or performance. Note however that we only bump the hard limit,
2282 * not the soft limit. That's because select() works the way it works, and chokes on fds
2283 * >= 1024. If we'd bump the soft limit globally, it might accidentally happen to
2284 * unexpecting programs that they get fds higher than what they can process using
2285 * select(). By only bumping the hard limit but leaving the low limit as it is we avoid
2286 * this pitfall: programs that are written by folks aware of the select() problem in mind
2287 * (and thus use poll()/epoll instead of select(), the way everybody should) can
2288 * explicitly opt into high fds by bumping their soft limit beyond 1024, to the hard limit
2289 * we pass. */
2290 if (arg_system) {
2291 int nr;
2292
2293 /* Get the underlying absolute limit the kernel enforces */
2294 nr = read_nr_open();
2295
2296 rl->rlim_max = MIN((rlim_t) nr, MAX(rl->rlim_max, (rlim_t) HIGH_RLIMIT_NOFILE));
2297 }
2298
2299 /* If for some reason we were invoked with a soft limit above 1024 (which should never
2300 * happen!, but who knows what we get passed in from pam_limit when invoked as --user
2301 * instance), then lower what we pass on to not confuse our children */
2302 rl->rlim_cur = MIN(rl->rlim_cur, (rlim_t) FD_SETSIZE);
2303
2304 arg_default_rlimit[RLIMIT_NOFILE] = rl;
2305 }
2306
2307 static void fallback_rlimit_memlock(const struct rlimit *saved_rlimit_memlock) {
2308 struct rlimit *rl;
2309
2310 /* Pass the original value down to invoked processes */
2311
2312 if (arg_default_rlimit[RLIMIT_MEMLOCK])
2313 return;
2314
2315 rl = newdup(struct rlimit, saved_rlimit_memlock, 1);
2316 if (!rl) {
2317 log_oom();
2318 return;
2319 }
2320
2321 if (arg_system) {
2322 /* Raise the default limit to 8M also on old kernels and in containers (8M is the kernel
2323 * default for this since kernel 5.16) */
2324 rl->rlim_max = MAX(rl->rlim_max, (rlim_t) DEFAULT_RLIMIT_MEMLOCK);
2325 rl->rlim_cur = MAX(rl->rlim_cur, (rlim_t) DEFAULT_RLIMIT_MEMLOCK);
2326 }
2327
2328 arg_default_rlimit[RLIMIT_MEMLOCK] = rl;
2329 }
2330
2331 static void setenv_manager_environment(void) {
2332 int r;
2333
2334 STRV_FOREACH(p, arg_manager_environment) {
2335 log_debug("Setting '%s' in our own environment.", *p);
2336
2337 r = putenv_dup(*p, true);
2338 if (r < 0)
2339 log_warning_errno(errno, "Failed to setenv \"%s\", ignoring: %m", *p);
2340 }
2341 }
2342
2343 static void reset_arguments(void) {
2344 /* Frees/resets arg_* variables, with a few exceptions commented below. */
2345
2346 arg_default_unit = mfree(arg_default_unit);
2347
2348 /* arg_system — ignore */
2349
2350 arg_dump_core = true;
2351 arg_crash_chvt = -1;
2352 arg_crash_shell = false;
2353 arg_crash_reboot = false;
2354 arg_confirm_spawn = mfree(arg_confirm_spawn);
2355 arg_show_status = _SHOW_STATUS_INVALID;
2356 arg_status_unit_format = STATUS_UNIT_FORMAT_DEFAULT;
2357 arg_switched_root = false;
2358 arg_pager_flags = 0;
2359 arg_service_watchdogs = true;
2360 arg_default_std_output = EXEC_OUTPUT_JOURNAL;
2361 arg_default_std_error = EXEC_OUTPUT_INHERIT;
2362 arg_default_restart_usec = DEFAULT_RESTART_USEC;
2363 arg_default_timeout_start_usec = DEFAULT_TIMEOUT_USEC;
2364 arg_default_timeout_stop_usec = DEFAULT_TIMEOUT_USEC;
2365 arg_default_timeout_abort_usec = DEFAULT_TIMEOUT_USEC;
2366 arg_default_timeout_abort_set = false;
2367 arg_default_start_limit_interval = DEFAULT_START_LIMIT_INTERVAL;
2368 arg_default_start_limit_burst = DEFAULT_START_LIMIT_BURST;
2369 arg_runtime_watchdog = 0;
2370 arg_reboot_watchdog = 10 * USEC_PER_MINUTE;
2371 arg_kexec_watchdog = 0;
2372 arg_pretimeout_watchdog = 0;
2373 arg_early_core_pattern = NULL;
2374 arg_watchdog_device = NULL;
2375 arg_watchdog_pretimeout_governor = mfree(arg_watchdog_pretimeout_governor);
2376
2377 arg_default_environment = strv_free(arg_default_environment);
2378 arg_manager_environment = strv_free(arg_manager_environment);
2379 rlimit_free_all(arg_default_rlimit);
2380
2381 arg_capability_bounding_set = CAP_ALL;
2382 arg_no_new_privs = false;
2383 arg_timer_slack_nsec = NSEC_INFINITY;
2384 arg_default_timer_accuracy_usec = 1 * USEC_PER_MINUTE;
2385
2386 arg_syscall_archs = set_free(arg_syscall_archs);
2387
2388 /* arg_serialization — ignore */
2389
2390 arg_default_cpu_accounting = -1;
2391 arg_default_io_accounting = false;
2392 arg_default_ip_accounting = false;
2393 arg_default_blockio_accounting = false;
2394 arg_default_memory_accounting = MEMORY_ACCOUNTING_DEFAULT;
2395 arg_default_tasks_accounting = true;
2396 arg_default_tasks_max = DEFAULT_TASKS_MAX;
2397 arg_machine_id = (sd_id128_t) {};
2398 arg_cad_burst_action = EMERGENCY_ACTION_REBOOT_FORCE;
2399 arg_default_oom_policy = OOM_STOP;
2400
2401 cpu_set_reset(&arg_cpu_affinity);
2402 numa_policy_reset(&arg_numa_policy);
2403
2404 arg_random_seed = mfree(arg_random_seed);
2405 arg_random_seed_size = 0;
2406 arg_clock_usec = 0;
2407
2408 arg_default_oom_score_adjust_set = false;
2409 }
2410
2411 static void determine_default_oom_score_adjust(void) {
2412 int r, a, b;
2413
2414 /* Run our services at slightly higher OOM score than ourselves. But let's be conservative here, and
2415 * do this only if we don't run as root (i.e. only if we are run in user mode, for an unprivileged
2416 * user). */
2417
2418 if (arg_default_oom_score_adjust_set)
2419 return;
2420
2421 if (getuid() == 0)
2422 return;
2423
2424 r = get_oom_score_adjust(&a);
2425 if (r < 0)
2426 return (void) log_warning_errno(r, "Failed to determine current OOM score adjustment value, ignoring: %m");
2427
2428 assert_cc(100 <= OOM_SCORE_ADJ_MAX);
2429 b = a >= OOM_SCORE_ADJ_MAX - 100 ? OOM_SCORE_ADJ_MAX : a + 100;
2430
2431 if (a == b)
2432 return;
2433
2434 arg_default_oom_score_adjust = b;
2435 arg_default_oom_score_adjust_set = true;
2436 }
2437
2438 static int parse_configuration(const struct rlimit *saved_rlimit_nofile,
2439 const struct rlimit *saved_rlimit_memlock) {
2440 int r;
2441
2442 assert(saved_rlimit_nofile);
2443 assert(saved_rlimit_memlock);
2444
2445 /* Assign configuration defaults */
2446 reset_arguments();
2447
2448 r = parse_config_file();
2449 if (r < 0)
2450 log_warning_errno(r, "Failed to parse config file, ignoring: %m");
2451
2452 if (arg_system) {
2453 r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, 0);
2454 if (r < 0)
2455 log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
2456 }
2457
2458 /* Initialize some default rlimits for services if they haven't been configured */
2459 fallback_rlimit_nofile(saved_rlimit_nofile);
2460 fallback_rlimit_memlock(saved_rlimit_memlock);
2461
2462 /* Note that this also parses bits from the kernel command line, including "debug". */
2463 log_parse_environment();
2464
2465 /* Initialize the show status setting if it hasn't been set explicitly yet */
2466 if (arg_show_status == _SHOW_STATUS_INVALID)
2467 arg_show_status = SHOW_STATUS_YES;
2468
2469 /* Slightly raise the OOM score for our services if we are running for unprivileged users. */
2470 determine_default_oom_score_adjust();
2471
2472 /* Push variables into the manager environment block */
2473 setenv_manager_environment();
2474
2475 /* Parse log environment variables again to take into account any new environment variables. */
2476 log_parse_environment();
2477
2478 return 0;
2479 }
2480
2481 static int safety_checks(void) {
2482
2483 if (getpid_cached() == 1 &&
2484 arg_action != ACTION_RUN)
2485 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
2486 "Unsupported execution mode while PID 1.");
2487
2488 if (getpid_cached() == 1 &&
2489 !arg_system)
2490 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
2491 "Can't run --user mode as PID 1.");
2492
2493 if (arg_action == ACTION_RUN &&
2494 arg_system &&
2495 getpid_cached() != 1)
2496 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
2497 "Can't run system mode unless PID 1.");
2498
2499 if (arg_action == ACTION_TEST &&
2500 geteuid() == 0)
2501 return log_error_errno(SYNTHETIC_ERRNO(EPERM),
2502 "Don't run test mode as root.");
2503
2504 if (!arg_system &&
2505 arg_action == ACTION_RUN &&
2506 sd_booted() <= 0)
2507 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
2508 "Trying to run as user instance, but the system has not been booted with systemd.");
2509
2510 if (!arg_system &&
2511 arg_action == ACTION_RUN &&
2512 !getenv("XDG_RUNTIME_DIR"))
2513 return log_error_errno(SYNTHETIC_ERRNO(EUNATCH),
2514 "Trying to run as user instance, but $XDG_RUNTIME_DIR is not set.");
2515
2516 if (arg_system &&
2517 arg_action == ACTION_RUN &&
2518 running_in_chroot() > 0)
2519 return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
2520 "Cannot be run in a chroot() environment.");
2521
2522 return 0;
2523 }
2524
2525 static int initialize_security(
2526 bool *loaded_policy,
2527 dual_timestamp *security_start_timestamp,
2528 dual_timestamp *security_finish_timestamp,
2529 const char **ret_error_message) {
2530
2531 int r;
2532
2533 assert(loaded_policy);
2534 assert(security_start_timestamp);
2535 assert(security_finish_timestamp);
2536 assert(ret_error_message);
2537
2538 dual_timestamp_get(security_start_timestamp);
2539
2540 r = mac_selinux_setup(loaded_policy);
2541 if (r < 0) {
2542 *ret_error_message = "Failed to load SELinux policy";
2543 return r;
2544 }
2545
2546 r = mac_smack_setup(loaded_policy);
2547 if (r < 0) {
2548 *ret_error_message = "Failed to load SMACK policy";
2549 return r;
2550 }
2551
2552 r = mac_apparmor_setup();
2553 if (r < 0) {
2554 *ret_error_message = "Failed to load AppArmor policy";
2555 return r;
2556 }
2557
2558 r = ima_setup();
2559 if (r < 0) {
2560 *ret_error_message = "Failed to load IMA policy";
2561 return r;
2562 }
2563
2564 dual_timestamp_get(security_finish_timestamp);
2565 return 0;
2566 }
2567
2568 static int collect_fds(FDSet **ret_fds, const char **ret_error_message) {
2569 int r;
2570
2571 assert(ret_fds);
2572 assert(ret_error_message);
2573
2574 r = fdset_new_fill(ret_fds);
2575 if (r < 0) {
2576 *ret_error_message = "Failed to allocate fd set";
2577 return log_emergency_errno(r, "Failed to allocate fd set: %m");
2578 }
2579
2580 fdset_cloexec(*ret_fds, true);
2581
2582 if (arg_serialization)
2583 assert_se(fdset_remove(*ret_fds, fileno(arg_serialization)) >= 0);
2584
2585 return 0;
2586 }
2587
2588 static void setup_console_terminal(bool skip_setup) {
2589
2590 if (!arg_system)
2591 return;
2592
2593 /* Become a session leader if we aren't one yet. */
2594 (void) setsid();
2595
2596 /* If we are init, we connect stdin/stdout/stderr to /dev/null and make sure we don't have a
2597 * controlling tty. */
2598 (void) release_terminal();
2599
2600 /* Reset the console, but only if this is really init and we are freshly booted */
2601 if (getpid_cached() == 1 && !skip_setup)
2602 (void) console_setup();
2603 }
2604
2605 static bool early_skip_setup_check(int argc, char *argv[]) {
2606 bool found_deserialize = false;
2607
2608 /* Determine if this is a reexecution or normal bootup. We do the full command line parsing much
2609 * later, so let's just have a quick peek here. Note that if we have switched root, do all the
2610 * special setup things anyway, even if in that case we also do deserialization. */
2611
2612 for (int i = 1; i < argc; i++)
2613 if (streq(argv[i], "--switched-root"))
2614 return false; /* If we switched root, don't skip the setup. */
2615 else if (streq(argv[i], "--deserialize"))
2616 found_deserialize = true;
2617
2618 return found_deserialize; /* When we are deserializing, then we are reexecuting, hence avoid the extensive setup */
2619 }
2620
2621 static int save_env(void) {
2622 char **l;
2623
2624 l = strv_copy(environ);
2625 if (!l)
2626 return -ENOMEM;
2627
2628 strv_free_and_replace(saved_env, l);
2629 return 0;
2630 }
2631
2632 int main(int argc, char *argv[]) {
2633 dual_timestamp
2634 initrd_timestamp = DUAL_TIMESTAMP_NULL,
2635 userspace_timestamp = DUAL_TIMESTAMP_NULL,
2636 kernel_timestamp = DUAL_TIMESTAMP_NULL,
2637 security_start_timestamp = DUAL_TIMESTAMP_NULL,
2638 security_finish_timestamp = DUAL_TIMESTAMP_NULL;
2639 struct rlimit saved_rlimit_nofile = RLIMIT_MAKE_CONST(0),
2640 saved_rlimit_memlock = RLIMIT_MAKE_CONST(RLIM_INFINITY); /* The original rlimits we passed
2641 * in. Note we use different values
2642 * for the two that indicate whether
2643 * these fields are initialized! */
2644 bool skip_setup, loaded_policy = false, queue_default_job = false, first_boot = false;
2645 char *switch_root_dir = NULL, *switch_root_init = NULL;
2646 usec_t before_startup, after_startup;
2647 static char systemd[] = "systemd";
2648 const char *shutdown_verb = NULL, *error_message = NULL;
2649 int r, retval = EXIT_FAILURE;
2650 Manager *m = NULL;
2651 FDSet *fds = NULL;
2652
2653 assert_se(argc > 0 && !isempty(argv[0]));
2654
2655 /* SysV compatibility: redirect init → telinit */
2656 redirect_telinit(argc, argv);
2657
2658 /* Take timestamps early on */
2659 dual_timestamp_from_monotonic(&kernel_timestamp, 0);
2660 dual_timestamp_get(&userspace_timestamp);
2661
2662 /* Figure out whether we need to do initialize the system, or if we already did that because we are
2663 * reexecuting. */
2664 skip_setup = early_skip_setup_check(argc, argv);
2665
2666 /* If we get started via the /sbin/init symlink then we are called 'init'. After a subsequent
2667 * reexecution we are then called 'systemd'. That is confusing, hence let's call us systemd
2668 * right-away. */
2669 program_invocation_short_name = systemd;
2670 (void) prctl(PR_SET_NAME, systemd);
2671
2672 /* Save the original command line */
2673 save_argc_argv(argc, argv);
2674
2675 /* Save the original environment as we might need to restore it if we're requested to execute another
2676 * system manager later. */
2677 r = save_env();
2678 if (r < 0) {
2679 error_message = "Failed to copy environment block";
2680 goto finish;
2681 }
2682
2683 /* Make sure that if the user says "syslog" we actually log to the journal. */
2684 log_set_upgrade_syslog_to_journal(true);
2685
2686 if (getpid_cached() == 1) {
2687 /* When we run as PID 1 force system mode */
2688 arg_system = true;
2689
2690 /* Disable the umask logic */
2691 umask(0);
2692
2693 /* Make sure that at least initially we do not ever log to journald/syslogd, because it might
2694 * not be activated yet (even though the log socket for it exists). */
2695 log_set_prohibit_ipc(true);
2696
2697 /* Always reopen /dev/console when running as PID 1 or one of its pre-execve() children. This
2698 * is important so that we never end up logging to any foreign stderr, for example if we have
2699 * to log in a child process right before execve()'ing the actual binary, at a point in time
2700 * where socket activation stderr/stdout area already set up. */
2701 log_set_always_reopen_console(true);
2702
2703 if (detect_container() <= 0) {
2704
2705 /* Running outside of a container as PID 1 */
2706 log_set_target(LOG_TARGET_KMSG);
2707 log_open();
2708
2709 if (in_initrd())
2710 initrd_timestamp = userspace_timestamp;
2711
2712 if (!skip_setup) {
2713 r = mount_setup_early();
2714 if (r < 0) {
2715 error_message = "Failed to mount early API filesystems";
2716 goto finish;
2717 }
2718
2719 /* Let's open the log backend a second time, in case the first time didn't
2720 * work. Quite possibly we have mounted /dev just now, so /dev/kmsg became
2721 * available, and it previously wasn't. */
2722 log_open();
2723
2724 disable_printk_ratelimit();
2725
2726 r = initialize_security(
2727 &loaded_policy,
2728 &security_start_timestamp,
2729 &security_finish_timestamp,
2730 &error_message);
2731 if (r < 0)
2732 goto finish;
2733 }
2734
2735 if (mac_selinux_init() < 0) {
2736 error_message = "Failed to initialize SELinux support";
2737 goto finish;
2738 }
2739
2740 if (!skip_setup)
2741 initialize_clock();
2742
2743 /* Set the default for later on, but don't actually open the logs like this for
2744 * now. Note that if we are transitioning from the initrd there might still be
2745 * journal fd open, and we shouldn't attempt opening that before we parsed
2746 * /proc/cmdline which might redirect output elsewhere. */
2747 log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
2748
2749 } else {
2750 /* Running inside a container, as PID 1 */
2751 log_set_target(LOG_TARGET_CONSOLE);
2752 log_open();
2753
2754 /* For later on, see above... */
2755 log_set_target(LOG_TARGET_JOURNAL);
2756
2757 /* clear the kernel timestamp, because we are in a container */
2758 kernel_timestamp = DUAL_TIMESTAMP_NULL;
2759 }
2760
2761 initialize_coredump(skip_setup);
2762
2763 r = fixup_environment();
2764 if (r < 0) {
2765 log_emergency_errno(r, "Failed to fix up PID 1 environment: %m");
2766 error_message = "Failed to fix up PID1 environment";
2767 goto finish;
2768 }
2769
2770 /* Try to figure out if we can use colors with the console. No need to do that for user
2771 * instances since they never log into the console. */
2772 log_show_color(colors_enabled());
2773
2774 r = make_null_stdio();
2775 if (r < 0)
2776 log_warning_errno(r, "Failed to redirect standard streams to /dev/null, ignoring: %m");
2777
2778 /* Load the kernel modules early. */
2779 if (!skip_setup)
2780 kmod_setup();
2781
2782 /* Mount /proc, /sys and friends, so that /proc/cmdline and /proc/$PID/fd is available. */
2783 r = mount_setup(loaded_policy, skip_setup);
2784 if (r < 0) {
2785 error_message = "Failed to mount API filesystems";
2786 goto finish;
2787 }
2788
2789 /* The efivarfs is now mounted, let's read the random seed off it */
2790 (void) efi_take_random_seed();
2791
2792 /* Cache command-line options passed from EFI variables */
2793 if (!skip_setup)
2794 (void) cache_efi_options_variable();
2795 } else {
2796 /* Running as user instance */
2797 arg_system = false;
2798 log_set_target(LOG_TARGET_AUTO);
2799 log_open();
2800
2801 /* clear the kernel timestamp, because we are not PID 1 */
2802 kernel_timestamp = DUAL_TIMESTAMP_NULL;
2803
2804 if (mac_selinux_init() < 0) {
2805 error_message = "Failed to initialize SELinux support";
2806 goto finish;
2807 }
2808 }
2809
2810 /* Save the original RLIMIT_NOFILE/RLIMIT_MEMLOCK so that we can reset it later when
2811 * transitioning from the initrd to the main systemd or suchlike. */
2812 save_rlimits(&saved_rlimit_nofile, &saved_rlimit_memlock);
2813
2814 /* Reset all signal handlers. */
2815 (void) reset_all_signal_handlers();
2816 (void) ignore_signals(SIGNALS_IGNORE);
2817
2818 (void) parse_configuration(&saved_rlimit_nofile, &saved_rlimit_memlock);
2819
2820 r = parse_argv(argc, argv);
2821 if (r < 0) {
2822 error_message = "Failed to parse commandline arguments";
2823 goto finish;
2824 }
2825
2826 r = safety_checks();
2827 if (r < 0)
2828 goto finish;
2829
2830 if (IN_SET(arg_action, ACTION_TEST, ACTION_HELP, ACTION_DUMP_CONFIGURATION_ITEMS, ACTION_DUMP_BUS_PROPERTIES, ACTION_BUS_INTROSPECT))
2831 pager_open(arg_pager_flags);
2832
2833 if (arg_action != ACTION_RUN)
2834 skip_setup = true;
2835
2836 if (arg_action == ACTION_HELP) {
2837 retval = help() < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
2838 goto finish;
2839 } else if (arg_action == ACTION_VERSION) {
2840 retval = version();
2841 goto finish;
2842 } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
2843 unit_dump_config_items(stdout);
2844 retval = EXIT_SUCCESS;
2845 goto finish;
2846 } else if (arg_action == ACTION_DUMP_BUS_PROPERTIES) {
2847 dump_bus_properties(stdout);
2848 retval = EXIT_SUCCESS;
2849 goto finish;
2850 } else if (arg_action == ACTION_BUS_INTROSPECT) {
2851 r = bus_manager_introspect_implementations(stdout, arg_bus_introspect);
2852 retval = r >= 0 ? EXIT_SUCCESS : EXIT_FAILURE;
2853 goto finish;
2854 }
2855
2856 assert_se(IN_SET(arg_action, ACTION_RUN, ACTION_TEST));
2857
2858 /* Move out of the way, so that we won't block unmounts */
2859 assert_se(chdir("/") == 0);
2860
2861 if (arg_action == ACTION_RUN) {
2862 if (!skip_setup) {
2863 /* Apply the systemd.clock_usec= kernel command line switch */
2864 apply_clock_update();
2865
2866 /* Apply random seed from kernel command line */
2867 cmdline_take_random_seed();
2868 }
2869
2870 /* A core pattern might have been specified via the cmdline. */
2871 initialize_core_pattern(skip_setup);
2872
2873 /* Close logging fds, in order not to confuse collecting passed fds and terminal logic below */
2874 log_close();
2875
2876 /* Remember open file descriptors for later deserialization */
2877 r = collect_fds(&fds, &error_message);
2878 if (r < 0)
2879 goto finish;
2880
2881 /* Give up any control of the console, but make sure its initialized. */
2882 setup_console_terminal(skip_setup);
2883
2884 /* Open the logging devices, if possible and necessary */
2885 log_open();
2886 }
2887
2888 log_execution_mode(&first_boot);
2889
2890 r = initialize_runtime(skip_setup,
2891 first_boot,
2892 &saved_rlimit_nofile,
2893 &saved_rlimit_memlock,
2894 &error_message);
2895 if (r < 0)
2896 goto finish;
2897
2898 r = manager_new(arg_system ? LOOKUP_SCOPE_SYSTEM : LOOKUP_SCOPE_USER,
2899 arg_action == ACTION_TEST ? MANAGER_TEST_FULL : 0,
2900 &m);
2901 if (r < 0) {
2902 log_emergency_errno(r, "Failed to allocate manager object: %m");
2903 error_message = "Failed to allocate manager object";
2904 goto finish;
2905 }
2906
2907 m->timestamps[MANAGER_TIMESTAMP_KERNEL] = kernel_timestamp;
2908 m->timestamps[MANAGER_TIMESTAMP_INITRD] = initrd_timestamp;
2909 m->timestamps[MANAGER_TIMESTAMP_USERSPACE] = userspace_timestamp;
2910 m->timestamps[manager_timestamp_initrd_mangle(MANAGER_TIMESTAMP_SECURITY_START)] = security_start_timestamp;
2911 m->timestamps[manager_timestamp_initrd_mangle(MANAGER_TIMESTAMP_SECURITY_FINISH)] = security_finish_timestamp;
2912
2913 set_manager_defaults(m);
2914 set_manager_settings(m);
2915 manager_set_first_boot(m, first_boot);
2916
2917 /* Remember whether we should queue the default job */
2918 queue_default_job = !arg_serialization || arg_switched_root;
2919
2920 before_startup = now(CLOCK_MONOTONIC);
2921
2922 r = manager_startup(m, arg_serialization, fds, /* root= */ NULL);
2923 if (r < 0) {
2924 error_message = "Failed to start up manager";
2925 goto finish;
2926 }
2927
2928 /* This will close all file descriptors that were opened, but not claimed by any unit. */
2929 fds = fdset_free(fds);
2930 arg_serialization = safe_fclose(arg_serialization);
2931
2932 if (queue_default_job) {
2933 r = do_queue_default_job(m, &error_message);
2934 if (r < 0)
2935 goto finish;
2936 }
2937
2938 after_startup = now(CLOCK_MONOTONIC);
2939
2940 log_full(arg_action == ACTION_TEST ? LOG_INFO : LOG_DEBUG,
2941 "Loaded units and determined initial transaction in %s.",
2942 FORMAT_TIMESPAN(after_startup - before_startup, 100 * USEC_PER_MSEC));
2943
2944 if (arg_action == ACTION_TEST) {
2945 manager_test_summary(m);
2946 retval = EXIT_SUCCESS;
2947 goto finish;
2948 }
2949
2950 r = invoke_main_loop(m,
2951 &saved_rlimit_nofile,
2952 &saved_rlimit_memlock,
2953 &retval,
2954 &shutdown_verb,
2955 &fds,
2956 &switch_root_dir,
2957 &switch_root_init,
2958 &error_message);
2959 assert(r < 0 || IN_SET(r, MANAGER_EXIT, /* MANAGER_OK is not expected here. */
2960 MANAGER_RELOAD,
2961 MANAGER_REEXECUTE,
2962 MANAGER_REBOOT,
2963 MANAGER_POWEROFF,
2964 MANAGER_HALT,
2965 MANAGER_KEXEC,
2966 MANAGER_SWITCH_ROOT));
2967
2968 finish:
2969 pager_close();
2970
2971 if (m) {
2972 arg_reboot_watchdog = manager_get_watchdog(m, WATCHDOG_REBOOT);
2973 arg_kexec_watchdog = manager_get_watchdog(m, WATCHDOG_KEXEC);
2974 m = manager_free(m);
2975 }
2976
2977 mac_selinux_finish();
2978
2979 if (IN_SET(r, MANAGER_REEXECUTE, MANAGER_SWITCH_ROOT))
2980 r = do_reexecute(r,
2981 argc, argv,
2982 &saved_rlimit_nofile,
2983 &saved_rlimit_memlock,
2984 fds,
2985 switch_root_dir,
2986 switch_root_init,
2987 &error_message); /* This only returns if reexecution failed */
2988
2989 arg_serialization = safe_fclose(arg_serialization);
2990 fds = fdset_free(fds);
2991
2992 saved_env = strv_free(saved_env);
2993
2994 #if HAVE_VALGRIND_VALGRIND_H
2995 /* If we are PID 1 and running under valgrind, then let's exit
2996 * here explicitly. valgrind will only generate nice output on
2997 * exit(), not on exec(), hence let's do the former not the
2998 * latter here. */
2999 if (getpid_cached() == 1 && RUNNING_ON_VALGRIND) {
3000 /* Cleanup watchdog_device strings for valgrind. We need them
3001 * in become_shutdown() so normally we cannot free them yet. */
3002 watchdog_free_device();
3003 arg_watchdog_device = mfree(arg_watchdog_device);
3004 reset_arguments();
3005 return retval;
3006 }
3007 #endif
3008
3009 #if HAS_FEATURE_ADDRESS_SANITIZER
3010 __lsan_do_leak_check();
3011 #endif
3012
3013 /* Try to invoke the shutdown binary unless we already failed.
3014 * If we failed above, we want to freeze after finishing cleanup. */
3015 if (r >= 0 && shutdown_verb) {
3016 r = become_shutdown(shutdown_verb, retval);
3017 log_error_errno(r, "Failed to execute shutdown binary, %s: %m", getpid_cached() == 1 ? "freezing" : "quitting");
3018 error_message = "Failed to execute shutdown binary";
3019 }
3020
3021 watchdog_free_device();
3022 arg_watchdog_device = mfree(arg_watchdog_device);
3023
3024 if (getpid_cached() == 1) {
3025 if (error_message)
3026 manager_status_printf(NULL, STATUS_TYPE_EMERGENCY,
3027 ANSI_HIGHLIGHT_RED "!!!!!!" ANSI_NORMAL,
3028 "%s.", error_message);
3029 freeze_or_exit_or_reboot();
3030 }
3031
3032 reset_arguments();
3033 return retval;
3034 }
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