src/test/test-process-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <fcntl.h>
   4 #include <sys/mount.h>
   5 #include <sys/personality.h>
   6 #include <sys/prctl.h>
   7 #include <sys/stat.h>
   8 #include <sys/types.h>
   9 #include <sys/wait.h>
  10 #include <unistd.h>
  11 #if HAVE_VALGRIND_VALGRIND_H
  12 #include <valgrind/valgrind.h>
  13 #endif
  14
  15 #include "alloc-util.h"
  16 #include "architecture.h"
  17 #include "errno-util.h"
  18 #include "fd-util.h"
  19 #include "log.h"
  20 #include "macro.h"
  21 #include "missing_sched.h"
  22 #include "missing_syscall.h"
  23 #include "parse-util.h"
  24 #include "process-util.h"
  25 #include "rlimit-util.h"
  26 #include "signal-util.h"
  27 #include "stdio-util.h"
  28 #include "string-util.h"
  29 #include "terminal-util.h"
  30 #include "tests.h"
  31 #include "user-util.h"
  32 #include "util.h"
  33 #include "virt.h"
  34
  35 static void test_get_process_comm(pid_t pid) {
  36         struct stat st;
  37         _cleanup_free_ char *a = NULL, *c = NULL, *d = NULL, *f = NULL, *i = NULL;
  38         _cleanup_free_ char *env = NULL;
  39         char path[STRLEN("/proc//comm") + DECIMAL_STR_MAX(pid_t)];
  40         pid_t e;
  41         uid_t u;
  42         gid_t g;
  43         dev_t h;
  44         int r;
  45
  46         xsprintf(path, "/proc/"PID_FMT"/comm", pid);
  47
  48         if (stat(path, &st) == 0) {
  49                 assert_se(get_process_comm(pid, &a) >= 0);
  50                 log_info("PID"PID_FMT" comm: '%s'", pid, a);
  51         } else
  52                 log_warning("%s not exist.", path);
  53
  54         assert_se(get_process_cmdline(pid, 0, PROCESS_CMDLINE_COMM_FALLBACK, &c) >= 0);
  55         log_info("PID"PID_FMT" cmdline: '%s'", pid, c);
  56
  57         assert_se(get_process_cmdline(pid, 8, 0, &d) >= 0);
  58         log_info("PID"PID_FMT" cmdline truncated to 8: '%s'", pid, d);
  59
  60         free(d);
  61         assert_se(get_process_cmdline(pid, 1, 0, &d) >= 0);
  62         log_info("PID"PID_FMT" cmdline truncated to 1: '%s'", pid, d);
  63
  64         assert_se(get_process_ppid(pid, &e) >= 0);
  65         log_info("PID"PID_FMT" PPID: "PID_FMT, pid, e);
  66         assert_se(pid == 1 ? e == 0 : e > 0);
  67
  68         assert_se(is_kernel_thread(pid) == 0 || pid != 1);
  69
  70         r = get_process_exe(pid, &f);
  71         assert_se(r >= 0 || r == -EACCES);
  72         log_info("PID"PID_FMT" exe: '%s'", pid, strna(f));
  73
  74         assert_se(get_process_uid(pid, &u) == 0);
  75         log_info("PID"PID_FMT" UID: "UID_FMT, pid, u);
  76
  77         assert_se(get_process_gid(pid, &g) == 0);
  78         log_info("PID"PID_FMT" GID: "GID_FMT, pid, g);
  79
  80         r = get_process_environ(pid, &env);
  81         assert_se(r >= 0 || r == -EACCES);
  82         log_info("PID"PID_FMT" strlen(environ): %zi", pid, env ? (ssize_t)strlen(env) : (ssize_t)-errno);
  83
  84         if (!detect_container())
  85                 assert_se(get_ctty_devnr(pid, &h) == -ENXIO || pid != 1);
  86
  87         (void) getenv_for_pid(pid, "PATH", &i);
  88         log_info("PID"PID_FMT" $PATH: '%s'", pid, strna(i));
  89 }
  90
  91 static void test_get_process_comm_escape_one(const char *input, const char *output) {
  92         _cleanup_free_ char *n = NULL;
  93
  94         log_info("input: <%s> — output: <%s>", input, output);
  95
  96         assert_se(prctl(PR_SET_NAME, input) >= 0);
  97         assert_se(get_process_comm(0, &n) >= 0);
  98
  99         log_info("got: <%s>", n);
 100
 101         assert_se(streq_ptr(n, output));
 102 }
 103
 104 static void test_get_process_comm_escape(void) {
 105         _cleanup_free_ char *saved = NULL;
 106
 107         assert_se(get_process_comm(0, &saved) >= 0);
 108
 109         test_get_process_comm_escape_one("", "");
 110         test_get_process_comm_escape_one("foo", "foo");
 111         test_get_process_comm_escape_one("012345678901234", "012345678901234");
 112         test_get_process_comm_escape_one("0123456789012345", "012345678901234");
 113         test_get_process_comm_escape_one("äöüß", "\\303\\244\\303\\266\\303\\274\\303\\237");
 114         test_get_process_comm_escape_one("xäöüß", "x\\303\\244\\303\\266\\303\\274\\303\\237");
 115         test_get_process_comm_escape_one("xxäöüß", "xx\\303\\244\\303\\266\\303\\274\\303\\237");
 116         test_get_process_comm_escape_one("xxxäöüß", "xxx\\303\\244\\303\\266\\303\\274\\303\\237");
 117         test_get_process_comm_escape_one("xxxxäöüß", "xxxx\\303\\244\\303\\266\\303\\274\\303\\237");
 118         test_get_process_comm_escape_one("xxxxxäöüß", "xxxxx\\303\\244\\303\\266\\303\\274\\303\\237");
 119
 120         assert_se(prctl(PR_SET_NAME, saved) >= 0);
 121 }
 122
 123 static void test_pid_is_unwaited(void) {
 124         pid_t pid;
 125
 126         pid = fork();
 127         assert_se(pid >= 0);
 128         if (pid == 0) {
 129                 _exit(EXIT_SUCCESS);
 130         } else {
 131                 int status;
 132
 133                 waitpid(pid, &status, 0);
 134                 assert_se(!pid_is_unwaited(pid));
 135         }
 136         assert_se(pid_is_unwaited(getpid_cached()));
 137         assert_se(!pid_is_unwaited(-1));
 138 }
 139
 140 static void test_pid_is_alive(void) {
 141         pid_t pid;
 142
 143         pid = fork();
 144         assert_se(pid >= 0);
 145         if (pid == 0) {
 146                 _exit(EXIT_SUCCESS);
 147         } else {
 148                 int status;
 149
 150                 waitpid(pid, &status, 0);
 151                 assert_se(!pid_is_alive(pid));
 152         }
 153         assert_se(pid_is_alive(getpid_cached()));
 154         assert_se(!pid_is_alive(-1));
 155 }
 156
 157 static void test_personality(void) {
 158
 159         assert_se(personality_to_string(PER_LINUX));
 160         assert_se(!personality_to_string(PERSONALITY_INVALID));
 161
 162         assert_se(streq(personality_to_string(PER_LINUX), architecture_to_string(native_architecture())));
 163
 164         assert_se(personality_from_string(personality_to_string(PER_LINUX)) == PER_LINUX);
 165         assert_se(personality_from_string(architecture_to_string(native_architecture())) == PER_LINUX);
 166
 167 #ifdef __x86_64__
 168         assert_se(streq_ptr(personality_to_string(PER_LINUX), "x86-64"));
 169         assert_se(streq_ptr(personality_to_string(PER_LINUX32), "x86"));
 170
 171         assert_se(personality_from_string("x86-64") == PER_LINUX);
 172         assert_se(personality_from_string("x86") == PER_LINUX32);
 173         assert_se(personality_from_string("ia64") == PERSONALITY_INVALID);
 174         assert_se(personality_from_string(NULL) == PERSONALITY_INVALID);
 175
 176         assert_se(personality_from_string(personality_to_string(PER_LINUX32)) == PER_LINUX32);
 177 #endif
 178 }
 179
 180 static void test_get_process_cmdline_harder(void) {
 181         char path[] = "/tmp/test-cmdlineXXXXXX";
 182         _cleanup_close_ int fd = -1;
 183         _cleanup_free_ char *line = NULL;
 184         pid_t pid;
 185
 186         if (geteuid() != 0) {
 187                 log_info("Skipping %s: not root", __func__);
 188                 return;
 189         }
 190
 191         if (!have_namespaces()) {
 192                 log_notice("Testing without namespaces, skipping %s", __func__);
 193                 return;
 194         }
 195
 196 #if HAVE_VALGRIND_VALGRIND_H
 197         /* valgrind patches open(/proc//cmdline)
 198          * so, test_get_process_cmdline_harder fails always
 199          * See https://github.com/systemd/systemd/pull/3555#issuecomment-226564908 */
 200         if (RUNNING_ON_VALGRIND) {
 201                 log_info("Skipping %s: running on valgrind", __func__);
 202                 return;
 203         }
 204 #endif
 205
 206         pid = fork();
 207         if (pid > 0) {
 208                 siginfo_t si;
 209
 210                 (void) wait_for_terminate(pid, &si);
 211
 212                 assert_se(si.si_code == CLD_EXITED);
 213                 assert_se(si.si_status == 0);
 214
 215                 return;
 216         }
 217
 218         assert_se(pid == 0);
 219         assert_se(unshare(CLONE_NEWNS) >= 0);
 220
 221         if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL) < 0) {
 222                 log_warning_errno(errno, "mount(..., \"/\", MS_SLAVE|MS_REC, ...) failed: %m");
 223                 assert_se(IN_SET(errno, EPERM, EACCES));
 224                 return;
 225         }
 226
 227         fd = mkostemp(path, O_CLOEXEC);
 228         assert_se(fd >= 0);
 229
 230         /* Note that we don't unmount the following bind-mount at the end of the test because the kernel
 231          * will clear up its /proc/PID/ hierarchy automatically as soon as the test stops. */
 232         if (mount(path, "/proc/self/cmdline", "bind", MS_BIND, NULL) < 0) {
 233                 /* This happens under selinux… Abort the test in this case. */
 234                 log_warning_errno(errno, "mount(..., \"/proc/self/cmdline\", \"bind\", ...) failed: %m");
 235                 assert_se(IN_SET(errno, EPERM, EACCES));
 236                 return;
 237         }
 238
 239         /* Set RLIMIT_STACK to infinity to test we don't try to allocate unncessarily large values to read
 240          * the cmdline. */
 241         if (setrlimit(RLIMIT_STACK, &RLIMIT_MAKE_CONST(RLIM_INFINITY)) < 0)
 242                 log_warning("Testing without RLIMIT_STACK=infinity");
 243
 244         assert_se(unlink(path) >= 0);
 245
 246         assert_se(prctl(PR_SET_NAME, "testa") >= 0);
 247
 248         assert_se(get_process_cmdline(0, SIZE_MAX, 0, &line) == -ENOENT);
 249
 250         assert_se(get_process_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 251         assert_se(streq(line, "[testa]"));
 252         line = mfree(line);
 253
 254         assert_se(get_process_cmdline(0, 0, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 255         log_info("'%s'", line);
 256         assert_se(streq(line, ""));
 257         line = mfree(line);
 258
 259         assert_se(get_process_cmdline(0, 1, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 260         assert_se(streq(line, "…"));
 261         line = mfree(line);
 262
 263         assert_se(get_process_cmdline(0, 2, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 264         assert_se(streq(line, "[…"));
 265         line = mfree(line);
 266
 267         assert_se(get_process_cmdline(0, 3, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 268         assert_se(streq(line, "[t…"));
 269         line = mfree(line);
 270
 271         assert_se(get_process_cmdline(0, 4, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 272         assert_se(streq(line, "[te…"));
 273         line = mfree(line);
 274
 275         assert_se(get_process_cmdline(0, 5, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 276         assert_se(streq(line, "[tes…"));
 277         line = mfree(line);
 278
 279         assert_se(get_process_cmdline(0, 6, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 280         assert_se(streq(line, "[test…"));
 281         line = mfree(line);
 282
 283         assert_se(get_process_cmdline(0, 7, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 284         assert_se(streq(line, "[testa]"));
 285         line = mfree(line);
 286
 287         assert_se(get_process_cmdline(0, 8, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 288         assert_se(streq(line, "[testa]"));
 289         line = mfree(line);
 290
 291         assert_se(write(fd, "foo\0bar", 8) == 8);
 292
 293         assert_se(get_process_cmdline(0, SIZE_MAX, 0, &line) >= 0);
 294         log_info("'%s'", line);
 295         assert_se(streq(line, "foo bar"));
 296         line = mfree(line);
 297
 298         assert_se(get_process_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 299         assert_se(streq(line, "foo bar"));
 300         line = mfree(line);
 301
 302         assert_se(write(fd, "quux", 4) == 4);
 303         assert_se(get_process_cmdline(0, SIZE_MAX, 0, &line) >= 0);
 304         log_info("'%s'", line);
 305         assert_se(streq(line, "foo bar quux"));
 306         line = mfree(line);
 307
 308         assert_se(get_process_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 309         assert_se(streq(line, "foo bar quux"));
 310         line = mfree(line);
 311
 312         assert_se(get_process_cmdline(0, 1, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 313         assert_se(streq(line, "…"));
 314         line = mfree(line);
 315
 316         assert_se(get_process_cmdline(0, 2, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 317         assert_se(streq(line, "f…"));
 318         line = mfree(line);
 319
 320         assert_se(get_process_cmdline(0, 3, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 321         assert_se(streq(line, "fo…"));
 322         line = mfree(line);
 323
 324         assert_se(get_process_cmdline(0, 4, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 325         assert_se(streq(line, "foo…"));
 326         line = mfree(line);
 327
 328         assert_se(get_process_cmdline(0, 5, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 329         assert_se(streq(line, "foo …"));
 330         line = mfree(line);
 331
 332         assert_se(get_process_cmdline(0, 6, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 333         assert_se(streq(line, "foo b…"));
 334         line = mfree(line);
 335
 336         assert_se(get_process_cmdline(0, 7, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 337         assert_se(streq(line, "foo ba…"));
 338         line = mfree(line);
 339
 340         assert_se(get_process_cmdline(0, 8, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 341         assert_se(streq(line, "foo bar…"));
 342         line = mfree(line);
 343
 344         assert_se(get_process_cmdline(0, 9, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 345         assert_se(streq(line, "foo bar …"));
 346         line = mfree(line);
 347
 348         assert_se(get_process_cmdline(0, 10, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 349         assert_se(streq(line, "foo bar q…"));
 350         line = mfree(line);
 351
 352         assert_se(get_process_cmdline(0, 11, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 353         assert_se(streq(line, "foo bar qu…"));
 354         line = mfree(line);
 355
 356         assert_se(get_process_cmdline(0, 12, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 357         assert_se(streq(line, "foo bar quux"));
 358         line = mfree(line);
 359
 360         assert_se(get_process_cmdline(0, 13, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 361         assert_se(streq(line, "foo bar quux"));
 362         line = mfree(line);
 363
 364         assert_se(get_process_cmdline(0, 14, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 365         assert_se(streq(line, "foo bar quux"));
 366         line = mfree(line);
 367
 368         assert_se(get_process_cmdline(0, 1000, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 369         assert_se(streq(line, "foo bar quux"));
 370         line = mfree(line);
 371
 372         assert_se(ftruncate(fd, 0) >= 0);
 373         assert_se(prctl(PR_SET_NAME, "aaaa bbbb cccc") >= 0);
 374
 375         assert_se(get_process_cmdline(0, SIZE_MAX, 0, &line) == -ENOENT);
 376
 377         assert_se(get_process_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 378         assert_se(streq(line, "[aaaa bbbb cccc]"));
 379         line = mfree(line);
 380
 381         assert_se(get_process_cmdline(0, 10, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 382         assert_se(streq(line, "[aaaa bbb…"));
 383         line = mfree(line);
 384
 385         assert_se(get_process_cmdline(0, 11, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 386         assert_se(streq(line, "[aaaa bbbb…"));
 387         line = mfree(line);
 388
 389         assert_se(get_process_cmdline(0, 12, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 390         assert_se(streq(line, "[aaaa bbbb …"));
 391         line = mfree(line);
 392
 393         safe_close(fd);
 394         _exit(EXIT_SUCCESS);
 395 }
 396
 397 static void test_rename_process_now(const char *p, int ret) {
 398         _cleanup_free_ char *comm = NULL, *cmdline = NULL;
 399         int r;
 400
 401         r = rename_process(p);
 402         assert_se(r == ret ||
 403                   (ret == 0 && r >= 0) ||
 404                   (ret > 0 && r > 0));
 405
 406         if (r < 0)
 407                 return;
 408
 409 #if HAVE_VALGRIND_VALGRIND_H
 410         /* see above, valgrind is weird, we can't verify what we are doing here */
 411         if (RUNNING_ON_VALGRIND)
 412                 return;
 413 #endif
 414
 415         assert_se(get_process_comm(0, &comm) >= 0);
 416         log_info("comm = <%s>", comm);
 417         assert_se(strneq(comm, p, TASK_COMM_LEN-1));
 418         /* We expect comm to be at most 16 bytes (TASK_COMM_LEN). The kernel may raise this limit in the
 419          * future. We'd only check the initial part, at least until we recompile, but this will still pass. */
 420
 421         r = get_process_cmdline(0, SIZE_MAX, 0, &cmdline);
 422         assert_se(r >= 0);
 423         /* we cannot expect cmdline to be renamed properly without privileges */
 424         if (geteuid() == 0) {
 425                 if (r == 0 && detect_container() > 0)
 426                         log_info("cmdline = <%s> (not verified, Running in unprivileged container?)", cmdline);
 427                 else {
 428                         log_info("cmdline = <%s>", cmdline);
 429                         assert_se(strneq(p, cmdline, STRLEN("test-process-util")));
 430                         assert_se(startswith(p, cmdline));
 431                 }
 432         } else
 433                 log_info("cmdline = <%s> (not verified)", cmdline);
 434 }
 435
 436 static void test_rename_process_one(const char *p, int ret) {
 437         siginfo_t si;
 438         pid_t pid;
 439
 440         pid = fork();
 441         assert_se(pid >= 0);
 442
 443         if (pid == 0) {
 444                 /* child */
 445                 test_rename_process_now(p, ret);
 446                 _exit(EXIT_SUCCESS);
 447         }
 448
 449         assert_se(wait_for_terminate(pid, &si) >= 0);
 450         assert_se(si.si_code == CLD_EXITED);
 451         assert_se(si.si_status == EXIT_SUCCESS);
 452 }
 453
 454 static void test_rename_process_multi(void) {
 455         pid_t pid;
 456
 457         pid = fork();
 458         assert_se(pid >= 0);
 459
 460         if (pid > 0) {
 461                 siginfo_t si;
 462
 463                 assert_se(wait_for_terminate(pid, &si) >= 0);
 464                 assert_se(si.si_code == CLD_EXITED);
 465                 assert_se(si.si_status == EXIT_SUCCESS);
 466
 467                 return;
 468         }
 469
 470         /* child */
 471         test_rename_process_now("one", 1);
 472         test_rename_process_now("more", 0); /* longer than "one", hence truncated */
 473         (void) setresuid(99, 99, 99); /* change uid when running privileged */
 474         test_rename_process_now("time!", 0);
 475         test_rename_process_now("0", 1); /* shorter than "one", should fit */
 476         test_rename_process_one("", -EINVAL);
 477         test_rename_process_one(NULL, -EINVAL);
 478         _exit(EXIT_SUCCESS);
 479 }
 480
 481 static void test_rename_process(void) {
 482         test_rename_process_one(NULL, -EINVAL);
 483         test_rename_process_one("", -EINVAL);
 484         test_rename_process_one("foo", 1); /* should always fit */
 485         test_rename_process_one("this is a really really long process name, followed by some more words", 0); /* unlikely to fit */
 486         test_rename_process_one("1234567", 1); /* should always fit */
 487         test_rename_process_multi(); /* multiple invocations and dropped privileges */
 488 }
 489
 490 static void test_getpid_cached(void) {
 491         siginfo_t si;
 492         pid_t a, b, c, d, e, f, child;
 493
 494         a = raw_getpid();
 495         b = getpid_cached();
 496         c = getpid();
 497
 498         assert_se(a == b && a == c);
 499
 500         child = fork();
 501         assert_se(child >= 0);
 502
 503         if (child == 0) {
 504                 /* In child */
 505                 a = raw_getpid();
 506                 b = getpid_cached();
 507                 c = getpid();
 508
 509                 assert_se(a == b && a == c);
 510                 _exit(EXIT_SUCCESS);
 511         }
 512
 513         d = raw_getpid();
 514         e = getpid_cached();
 515         f = getpid();
 516
 517         assert_se(a == d && a == e && a == f);
 518
 519         assert_se(wait_for_terminate(child, &si) >= 0);
 520         assert_se(si.si_status == 0);
 521         assert_se(si.si_code == CLD_EXITED);
 522 }
 523
 524 #define MEASURE_ITERATIONS (10000000LLU)
 525
 526 static void test_getpid_measure(void) {
 527         unsigned long long i;
 528         usec_t t, q;
 529
 530         t = now(CLOCK_MONOTONIC);
 531         for (i = 0; i < MEASURE_ITERATIONS; i++)
 532                 (void) getpid();
 533         q = now(CLOCK_MONOTONIC) - t;
 534
 535         log_info(" glibc getpid(): %lf µs each\n", (double) q / MEASURE_ITERATIONS);
 536
 537         t = now(CLOCK_MONOTONIC);
 538         for (i = 0; i < MEASURE_ITERATIONS; i++)
 539                 (void) getpid_cached();
 540         q = now(CLOCK_MONOTONIC) - t;
 541
 542         log_info("getpid_cached(): %lf µs each\n", (double) q / MEASURE_ITERATIONS);
 543 }
 544
 545 static void test_safe_fork(void) {
 546         siginfo_t status;
 547         pid_t pid;
 548         int r;
 549
 550         BLOCK_SIGNALS(SIGCHLD);
 551
 552         r = safe_fork("(test-child)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_DEATHSIG|FORK_NULL_STDIO|FORK_REOPEN_LOG, &pid);
 553         assert_se(r >= 0);
 554
 555         if (r == 0) {
 556                 /* child */
 557                 usleep(100 * USEC_PER_MSEC);
 558
 559                 _exit(88);
 560         }
 561
 562         assert_se(wait_for_terminate(pid, &status) >= 0);
 563         assert_se(status.si_code == CLD_EXITED);
 564         assert_se(status.si_status == 88);
 565 }
 566
 567 static void test_pid_to_ptr(void) {
 568
 569         assert_se(PTR_TO_PID(NULL) == 0);
 570         assert_se(PID_TO_PTR(0) == NULL);
 571
 572         assert_se(PTR_TO_PID(PID_TO_PTR(1)) == 1);
 573         assert_se(PTR_TO_PID(PID_TO_PTR(2)) == 2);
 574         assert_se(PTR_TO_PID(PID_TO_PTR(-1)) == -1);
 575         assert_se(PTR_TO_PID(PID_TO_PTR(-2)) == -2);
 576
 577         assert_se(PTR_TO_PID(PID_TO_PTR(INT16_MAX)) == INT16_MAX);
 578         assert_se(PTR_TO_PID(PID_TO_PTR(INT16_MIN)) == INT16_MIN);
 579
 580         assert_se(PTR_TO_PID(PID_TO_PTR(INT32_MAX)) == INT32_MAX);
 581         assert_se(PTR_TO_PID(PID_TO_PTR(INT32_MIN)) == INT32_MIN);
 582 }
 583
 584 static void test_ioprio_class_from_to_string_one(const char *val, int expected) {
 585         assert_se(ioprio_class_from_string(val) == expected);
 586         if (expected >= 0) {
 587                 _cleanup_free_ char *s = NULL;
 588                 unsigned ret;
 589
 590                 assert_se(ioprio_class_to_string_alloc(expected, &s) == 0);
 591                 /* We sometimes get a class number and sometimes a number back */
 592                 assert_se(streq(s, val) ||
 593                           safe_atou(val, &ret) == 0);
 594         }
 595 }
 596
 597 static void test_ioprio_class_from_to_string(void) {
 598         test_ioprio_class_from_to_string_one("none", IOPRIO_CLASS_NONE);
 599         test_ioprio_class_from_to_string_one("realtime", IOPRIO_CLASS_RT);
 600         test_ioprio_class_from_to_string_one("best-effort", IOPRIO_CLASS_BE);
 601         test_ioprio_class_from_to_string_one("idle", IOPRIO_CLASS_IDLE);
 602         test_ioprio_class_from_to_string_one("0", 0);
 603         test_ioprio_class_from_to_string_one("1", 1);
 604         test_ioprio_class_from_to_string_one("7", 7);
 605         test_ioprio_class_from_to_string_one("8", 8);
 606         test_ioprio_class_from_to_string_one("9", -EINVAL);
 607         test_ioprio_class_from_to_string_one("-1", -EINVAL);
 608 }
 609
 610 static void test_setpriority_closest(void) {
 611         int r;
 612
 613         r = safe_fork("(test-setprio)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_DEATHSIG|FORK_WAIT|FORK_LOG, NULL);
 614         assert_se(r >= 0);
 615
 616         if (r == 0) {
 617                 bool full_test;
 618                 int p, q;
 619                 /* child */
 620
 621                 /* rlimit of 30 equals nice level of -10 */
 622                 if (setrlimit(RLIMIT_NICE, &RLIMIT_MAKE_CONST(30)) < 0) {
 623                         /* If this fails we are probably unprivileged or in a userns of some kind, let's skip
 624                          * the full test */
 625                         assert_se(ERRNO_IS_PRIVILEGE(errno));
 626                         full_test = false;
 627                 } else {
 628                         assert_se(setresgid(GID_NOBODY, GID_NOBODY, GID_NOBODY) >= 0);
 629                         assert_se(setresuid(UID_NOBODY, UID_NOBODY, UID_NOBODY) >= 0);
 630                         full_test = true;
 631                 }
 632
 633                 errno = 0;
 634                 p = getpriority(PRIO_PROCESS, 0);
 635                 assert_se(errno == 0);
 636
 637                 /* It should always be possible to set our nice level to the current one */
 638                 assert_se(setpriority_closest(p) > 0);
 639
 640                 errno = 0;
 641                 q = getpriority(PRIO_PROCESS, 0);
 642                 assert_se(errno == 0 && p == q);
 643
 644                 /* It should also be possible to set the nice level to one higher */
 645                 if (p < PRIO_MAX-1) {
 646                         assert_se(setpriority_closest(++p) > 0);
 647
 648                         errno = 0;
 649                         q = getpriority(PRIO_PROCESS, 0);
 650                         assert_se(errno == 0 && p == q);
 651                 }
 652
 653                 /* It should also be possible to set the nice level to two higher */
 654                 if (p < PRIO_MAX-1) {
 655                         assert_se(setpriority_closest(++p) > 0);
 656
 657                         errno = 0;
 658                         q = getpriority(PRIO_PROCESS, 0);
 659                         assert_se(errno == 0 && p == q);
 660                 }
 661
 662                 if (full_test) {
 663                         /* These two should work, given the RLIMIT_NICE we set above */
 664                         assert_se(setpriority_closest(-10) > 0);
 665                         errno = 0;
 666                         q = getpriority(PRIO_PROCESS, 0);
 667                         assert_se(errno == 0 && q == -10);
 668
 669                         assert_se(setpriority_closest(-9) > 0);
 670                         errno = 0;
 671                         q = getpriority(PRIO_PROCESS, 0);
 672                         assert_se(errno == 0 && q == -9);
 673
 674                         /* This should succeed but should be clamped to the limit */
 675                         assert_se(setpriority_closest(-11) == 0);
 676                         errno = 0;
 677                         q = getpriority(PRIO_PROCESS, 0);
 678                         assert_se(errno == 0 && q == -10);
 679
 680                         assert_se(setpriority_closest(-8) > 0);
 681                         errno = 0;
 682                         q = getpriority(PRIO_PROCESS, 0);
 683                         assert_se(errno == 0 && q == -8);
 684
 685                         /* This should succeed but should be clamped to the limit */
 686                         assert_se(setpriority_closest(-12) == 0);
 687                         errno = 0;
 688                         q = getpriority(PRIO_PROCESS, 0);
 689                         assert_se(errno == 0 && q == -10);
 690                 }
 691
 692                 _exit(EXIT_SUCCESS);
 693         }
 694 }
 695
 696 int main(int argc, char *argv[]) {
 697         test_setup_logging(LOG_DEBUG);
 698
 699         save_argc_argv(argc, argv);
 700
 701         if (argc > 1) {
 702                 pid_t pid = 0;
 703
 704                 (void) parse_pid(argv[1], &pid);
 705                 test_get_process_comm(pid);
 706         } else {
 707                 TEST_REQ_RUNNING_SYSTEMD(test_get_process_comm(1));
 708                 test_get_process_comm(getpid());
 709         }
 710
 711         test_get_process_comm_escape();
 712         test_pid_is_unwaited();
 713         test_pid_is_alive();
 714         test_personality();
 715         test_get_process_cmdline_harder();
 716         test_rename_process();
 717         test_getpid_cached();
 718         test_getpid_measure();
 719         test_safe_fork();
 720         test_pid_to_ptr();
 721         test_ioprio_class_from_to_string();
 722         test_setpriority_closest();
 723
 724         return 0;
 725 }