src/test/test-process-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <fcntl.h>
   4 #include <linux/oom.h>
   5 #include <sys/mount.h>
   6 #include <sys/personality.h>
   7 #include <sys/prctl.h>
   8 #include <sys/stat.h>
   9 #include <sys/types.h>
  10 #include <sys/wait.h>
  11 #include <unistd.h>
  12 #if HAVE_VALGRIND_VALGRIND_H
  13 #include <valgrind/valgrind.h>
  14 #endif
  15
  16 #include "alloc-util.h"
  17 #include "architecture.h"
  18 #include "dirent-util.h"
  19 #include "errno-list.h"
  20 #include "errno-util.h"
  21 #include "fd-util.h"
  22 #include "ioprio-util.h"
  23 #include "log.h"
  24 #include "macro.h"
  25 #include "missing_sched.h"
  26 #include "missing_syscall.h"
  27 #include "parse-util.h"
  28 #include "process-util.h"
  29 #include "procfs-util.h"
  30 #include "rlimit-util.h"
  31 #include "signal-util.h"
  32 #include "stdio-util.h"
  33 #include "string-util.h"
  34 #include "terminal-util.h"
  35 #include "tests.h"
  36 #include "user-util.h"
  37 #include "util.h"
  38 #include "virt.h"
  39
  40 static void test_get_process_comm_one(pid_t pid) {
  41         struct stat st;
  42         _cleanup_free_ char *a = NULL, *c = NULL, *d = NULL, *f = NULL, *i = NULL;
  43         _cleanup_free_ char *env = NULL;
  44         char path[STRLEN("/proc//comm") + DECIMAL_STR_MAX(pid_t)];
  45         pid_t e;
  46         uid_t u;
  47         gid_t g;
  48         dev_t h;
  49         int r;
  50
  51         log_info("/* %s */", __func__);
  52
  53         xsprintf(path, "/proc/"PID_FMT"/comm", pid);
  54
  55         if (stat(path, &st) == 0) {
  56                 assert_se(get_process_comm(pid, &a) >= 0);
  57                 log_info("PID"PID_FMT" comm: '%s'", pid, a);
  58         } else
  59                 log_warning("%s not exist.", path);
  60
  61         assert_se(get_process_cmdline(pid, 0, PROCESS_CMDLINE_COMM_FALLBACK, &c) >= 0);
  62         log_info("PID"PID_FMT" cmdline: '%s'", pid, c);
  63
  64         assert_se(get_process_cmdline(pid, 8, 0, &d) >= 0);
  65         log_info("PID"PID_FMT" cmdline truncated to 8: '%s'", pid, d);
  66
  67         free(d);
  68         assert_se(get_process_cmdline(pid, 1, 0, &d) >= 0);
  69         log_info("PID"PID_FMT" cmdline truncated to 1: '%s'", pid, d);
  70
  71         r = get_process_ppid(pid, &e);
  72         assert_se(pid == 1 ? r == -EADDRNOTAVAIL : r >= 0);
  73         if (r >= 0) {
  74                 log_info("PID"PID_FMT" PPID: "PID_FMT, pid, e);
  75                 assert_se(e > 0);
  76         }
  77
  78         assert_se(is_kernel_thread(pid) == 0 || pid != 1);
  79
  80         r = get_process_exe(pid, &f);
  81         assert_se(r >= 0 || r == -EACCES);
  82         log_info("PID"PID_FMT" exe: '%s'", pid, strna(f));
  83
  84         assert_se(get_process_uid(pid, &u) == 0);
  85         log_info("PID"PID_FMT" UID: "UID_FMT, pid, u);
  86
  87         assert_se(get_process_gid(pid, &g) == 0);
  88         log_info("PID"PID_FMT" GID: "GID_FMT, pid, g);
  89
  90         r = get_process_environ(pid, &env);
  91         assert_se(r >= 0 || r == -EACCES);
  92         log_info("PID"PID_FMT" strlen(environ): %zi", pid, env ? (ssize_t)strlen(env) : (ssize_t)-errno);
  93
  94         if (!detect_container())
  95                 assert_se(get_ctty_devnr(pid, &h) == -ENXIO || pid != 1);
  96
  97         (void) getenv_for_pid(pid, "PATH", &i);
  98         log_info("PID"PID_FMT" $PATH: '%s'", pid, strna(i));
  99 }
 100
 101 TEST(get_process_comm) {
 102         if (saved_argc > 1) {
 103                 pid_t pid = 0;
 104
 105                 (void) parse_pid(saved_argv[1], &pid);
 106                 test_get_process_comm_one(pid);
 107         } else {
 108                 TEST_REQ_RUNNING_SYSTEMD(test_get_process_comm_one(1));
 109                 test_get_process_comm_one(getpid());
 110         }
 111 }
 112
 113 static void test_get_process_cmdline_one(pid_t pid) {
 114         _cleanup_free_ char *c = NULL, *d = NULL, *e = NULL, *f = NULL, *g = NULL, *h = NULL;
 115         int r;
 116
 117         r = get_process_cmdline(pid, SIZE_MAX, 0, &c);
 118         log_info("PID "PID_FMT": %s", pid, r >= 0 ? c : errno_to_name(r));
 119
 120         r = get_process_cmdline(pid, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &d);
 121         log_info("      %s", r >= 0 ? d : errno_to_name(r));
 122
 123         r = get_process_cmdline(pid, SIZE_MAX, PROCESS_CMDLINE_QUOTE, &e);
 124         log_info("      %s", r >= 0 ? e : errno_to_name(r));
 125
 126         r = get_process_cmdline(pid, SIZE_MAX, PROCESS_CMDLINE_QUOTE | PROCESS_CMDLINE_COMM_FALLBACK, &f);
 127         log_info("      %s", r >= 0 ? f : errno_to_name(r));
 128
 129         r = get_process_cmdline(pid, SIZE_MAX, PROCESS_CMDLINE_QUOTE_POSIX, &g);
 130         log_info("      %s", r >= 0 ? g : errno_to_name(r));
 131
 132         r = get_process_cmdline(pid, SIZE_MAX, PROCESS_CMDLINE_QUOTE_POSIX | PROCESS_CMDLINE_COMM_FALLBACK, &h);
 133         log_info("      %s", r >= 0 ? h : errno_to_name(r));
 134 }
 135
 136 TEST(get_process_cmdline) {
 137         _cleanup_closedir_ DIR *d = NULL;
 138
 139         assert_se(d = opendir("/proc"));
 140
 141         FOREACH_DIRENT(de, d, return) {
 142                 pid_t pid;
 143
 144                 if (de->d_type != DT_DIR)
 145                         continue;
 146
 147                 if (parse_pid(de->d_name, &pid) < 0)
 148                         continue;
 149
 150                 test_get_process_cmdline_one(pid);
 151         }
 152 }
 153
 154 static void test_get_process_comm_escape_one(const char *input, const char *output) {
 155         _cleanup_free_ char *n = NULL;
 156
 157         log_debug("input: <%s> — output: <%s>", input, output);
 158
 159         assert_se(prctl(PR_SET_NAME, input) >= 0);
 160         assert_se(get_process_comm(0, &n) >= 0);
 161
 162         log_debug("got: <%s>", n);
 163
 164         assert_se(streq_ptr(n, output));
 165 }
 166
 167 TEST(get_process_comm_escape) {
 168         _cleanup_free_ char *saved = NULL;
 169
 170         assert_se(get_process_comm(0, &saved) >= 0);
 171
 172         test_get_process_comm_escape_one("", "");
 173         test_get_process_comm_escape_one("foo", "foo");
 174         test_get_process_comm_escape_one("012345678901234", "012345678901234");
 175         test_get_process_comm_escape_one("0123456789012345", "012345678901234");
 176         test_get_process_comm_escape_one("äöüß", "\\303\\244\\303\\266\\303\\274\\303\\237");
 177         test_get_process_comm_escape_one("xäöüß", "x\\303\\244\\303\\266\\303\\274\\303\\237");
 178         test_get_process_comm_escape_one("xxäöüß", "xx\\303\\244\\303\\266\\303\\274\\303\\237");
 179         test_get_process_comm_escape_one("xxxäöüß", "xxx\\303\\244\\303\\266\\303\\274\\303\\237");
 180         test_get_process_comm_escape_one("xxxxäöüß", "xxxx\\303\\244\\303\\266\\303\\274\\303\\237");
 181         test_get_process_comm_escape_one("xxxxxäöüß", "xxxxx\\303\\244\\303\\266\\303\\274\\303\\237");
 182
 183         assert_se(prctl(PR_SET_NAME, saved) >= 0);
 184 }
 185
 186 TEST(pid_is_unwaited) {
 187         pid_t pid;
 188
 189         pid = fork();
 190         assert_se(pid >= 0);
 191         if (pid == 0) {
 192                 _exit(EXIT_SUCCESS);
 193         } else {
 194                 int status;
 195
 196                 waitpid(pid, &status, 0);
 197                 assert_se(!pid_is_unwaited(pid));
 198         }
 199         assert_se(pid_is_unwaited(getpid_cached()));
 200         assert_se(!pid_is_unwaited(-1));
 201 }
 202
 203 TEST(pid_is_alive) {
 204         pid_t pid;
 205
 206         pid = fork();
 207         assert_se(pid >= 0);
 208         if (pid == 0) {
 209                 _exit(EXIT_SUCCESS);
 210         } else {
 211                 int status;
 212
 213                 waitpid(pid, &status, 0);
 214                 assert_se(!pid_is_alive(pid));
 215         }
 216         assert_se(pid_is_alive(getpid_cached()));
 217         assert_se(!pid_is_alive(-1));
 218 }
 219
 220 TEST(personality) {
 221         assert_se(personality_to_string(PER_LINUX));
 222         assert_se(!personality_to_string(PERSONALITY_INVALID));
 223
 224         assert_se(streq(personality_to_string(PER_LINUX), architecture_to_string(native_architecture())));
 225
 226         assert_se(personality_from_string(personality_to_string(PER_LINUX)) == PER_LINUX);
 227         assert_se(personality_from_string(architecture_to_string(native_architecture())) == PER_LINUX);
 228
 229 #ifdef __x86_64__
 230         assert_se(streq_ptr(personality_to_string(PER_LINUX), "x86-64"));
 231         assert_se(streq_ptr(personality_to_string(PER_LINUX32), "x86"));
 232
 233         assert_se(personality_from_string("x86-64") == PER_LINUX);
 234         assert_se(personality_from_string("x86") == PER_LINUX32);
 235         assert_se(personality_from_string("ia64") == PERSONALITY_INVALID);
 236         assert_se(personality_from_string(NULL) == PERSONALITY_INVALID);
 237
 238         assert_se(personality_from_string(personality_to_string(PER_LINUX32)) == PER_LINUX32);
 239 #endif
 240 }
 241
 242 TEST(get_process_cmdline_harder) {
 243         char path[] = "/tmp/test-cmdlineXXXXXX";
 244         _cleanup_close_ int fd = -1;
 245         _cleanup_free_ char *line = NULL;
 246         pid_t pid;
 247
 248         if (geteuid() != 0) {
 249                 log_info("Skipping %s: not root", __func__);
 250                 return;
 251         }
 252
 253         if (!have_namespaces()) {
 254                 log_notice("Testing without namespaces, skipping %s", __func__);
 255                 return;
 256         }
 257
 258 #if HAVE_VALGRIND_VALGRIND_H
 259         /* valgrind patches open(/proc//cmdline)
 260          * so, test_get_process_cmdline_harder fails always
 261          * See https://github.com/systemd/systemd/pull/3555#issuecomment-226564908 */
 262         if (RUNNING_ON_VALGRIND) {
 263                 log_info("Skipping %s: running on valgrind", __func__);
 264                 return;
 265         }
 266 #endif
 267
 268         pid = fork();
 269         if (pid > 0) {
 270                 siginfo_t si;
 271
 272                 (void) wait_for_terminate(pid, &si);
 273
 274                 assert_se(si.si_code == CLD_EXITED);
 275                 assert_se(si.si_status == 0);
 276
 277                 return;
 278         }
 279
 280         assert_se(pid == 0);
 281         assert_se(unshare(CLONE_NEWNS) >= 0);
 282
 283         if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL) < 0) {
 284                 log_warning_errno(errno, "mount(..., \"/\", MS_SLAVE|MS_REC, ...) failed: %m");
 285                 assert_se(IN_SET(errno, EPERM, EACCES));
 286                 return;
 287         }
 288
 289         fd = mkostemp(path, O_CLOEXEC);
 290         assert_se(fd >= 0);
 291
 292         /* Note that we don't unmount the following bind-mount at the end of the test because the kernel
 293          * will clear up its /proc/PID/ hierarchy automatically as soon as the test stops. */
 294         if (mount(path, "/proc/self/cmdline", "bind", MS_BIND, NULL) < 0) {
 295                 /* This happens under selinux… Abort the test in this case. */
 296                 log_warning_errno(errno, "mount(..., \"/proc/self/cmdline\", \"bind\", ...) failed: %m");
 297                 assert_se(IN_SET(errno, EPERM, EACCES));
 298                 return;
 299         }
 300
 301         /* Set RLIMIT_STACK to infinity to test we don't try to allocate unncessarily large values to read
 302          * the cmdline. */
 303         if (setrlimit(RLIMIT_STACK, &RLIMIT_MAKE_CONST(RLIM_INFINITY)) < 0)
 304                 log_warning("Testing without RLIMIT_STACK=infinity");
 305
 306         assert_se(unlink(path) >= 0);
 307
 308         assert_se(prctl(PR_SET_NAME, "testa") >= 0);
 309
 310         assert_se(get_process_cmdline(0, SIZE_MAX, 0, &line) == -ENOENT);
 311
 312         assert_se(get_process_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 313         log_debug("'%s'", line);
 314         assert_se(streq(line, "[testa]"));
 315         line = mfree(line);
 316
 317         assert_se(get_process_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK | PROCESS_CMDLINE_QUOTE, &line) >= 0);
 318         log_debug("'%s'", line);
 319         assert_se(streq(line, "\"[testa]\"")); /* quoting is enabled here */
 320         line = mfree(line);
 321
 322         assert_se(get_process_cmdline(0, 0, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 323         log_debug("'%s'", line);
 324         assert_se(streq(line, ""));
 325         line = mfree(line);
 326
 327         assert_se(get_process_cmdline(0, 1, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 328         assert_se(streq(line, "…"));
 329         line = mfree(line);
 330
 331         assert_se(get_process_cmdline(0, 2, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 332         assert_se(streq(line, "[…"));
 333         line = mfree(line);
 334
 335         assert_se(get_process_cmdline(0, 3, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 336         assert_se(streq(line, "[t…"));
 337         line = mfree(line);
 338
 339         assert_se(get_process_cmdline(0, 4, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 340         assert_se(streq(line, "[te…"));
 341         line = mfree(line);
 342
 343         assert_se(get_process_cmdline(0, 5, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 344         assert_se(streq(line, "[tes…"));
 345         line = mfree(line);
 346
 347         assert_se(get_process_cmdline(0, 6, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 348         assert_se(streq(line, "[test…"));
 349         line = mfree(line);
 350
 351         assert_se(get_process_cmdline(0, 7, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 352         assert_se(streq(line, "[testa]"));
 353         line = mfree(line);
 354
 355         assert_se(get_process_cmdline(0, 8, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 356         assert_se(streq(line, "[testa]"));
 357         line = mfree(line);
 358
 359         /* Test with multiple arguments that don't require quoting */
 360
 361         assert_se(write(fd, "foo\0bar", 8) == 8);
 362
 363         assert_se(get_process_cmdline(0, SIZE_MAX, 0, &line) >= 0);
 364         log_debug("'%s'", line);
 365         assert_se(streq(line, "foo bar"));
 366         line = mfree(line);
 367
 368         assert_se(get_process_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 369         assert_se(streq(line, "foo bar"));
 370         line = mfree(line);
 371
 372         assert_se(write(fd, "quux", 4) == 4);
 373         assert_se(get_process_cmdline(0, SIZE_MAX, 0, &line) >= 0);
 374         log_debug("'%s'", line);
 375         assert_se(streq(line, "foo bar quux"));
 376         line = mfree(line);
 377
 378         assert_se(get_process_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 379         log_debug("'%s'", line);
 380         assert_se(streq(line, "foo bar quux"));
 381         line = mfree(line);
 382
 383         assert_se(get_process_cmdline(0, 1, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 384         log_debug("'%s'", line);
 385         assert_se(streq(line, "…"));
 386         line = mfree(line);
 387
 388         assert_se(get_process_cmdline(0, 2, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 389         log_debug("'%s'", line);
 390         assert_se(streq(line, "f…"));
 391         line = mfree(line);
 392
 393         assert_se(get_process_cmdline(0, 3, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 394         log_debug("'%s'", line);
 395         assert_se(streq(line, "fo…"));
 396         line = mfree(line);
 397
 398         assert_se(get_process_cmdline(0, 4, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 399         log_debug("'%s'", line);
 400         assert_se(streq(line, "foo…"));
 401         line = mfree(line);
 402
 403         assert_se(get_process_cmdline(0, 5, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 404         log_debug("'%s'", line);
 405         assert_se(streq(line, "foo …"));
 406         line = mfree(line);
 407
 408         assert_se(get_process_cmdline(0, 6, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 409         log_debug("'%s'", line);
 410         assert_se(streq(line, "foo b…"));
 411         line = mfree(line);
 412
 413         assert_se(get_process_cmdline(0, 7, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 414         log_debug("'%s'", line);
 415         assert_se(streq(line, "foo ba…"));
 416         line = mfree(line);
 417
 418         assert_se(get_process_cmdline(0, 8, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 419         log_debug("'%s'", line);
 420         assert_se(streq(line, "foo bar…"));
 421         line = mfree(line);
 422
 423         assert_se(get_process_cmdline(0, 9, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 424         log_debug("'%s'", line);
 425         assert_se(streq(line, "foo bar …"));
 426         line = mfree(line);
 427
 428         assert_se(get_process_cmdline(0, 10, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 429         log_debug("'%s'", line);
 430         assert_se(streq(line, "foo bar q…"));
 431         line = mfree(line);
 432
 433         assert_se(get_process_cmdline(0, 11, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 434         log_debug("'%s'", line);
 435         assert_se(streq(line, "foo bar qu…"));
 436         line = mfree(line);
 437
 438         assert_se(get_process_cmdline(0, 12, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 439         log_debug("'%s'", line);
 440         assert_se(streq(line, "foo bar quux"));
 441         line = mfree(line);
 442
 443         assert_se(get_process_cmdline(0, 13, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 444         log_debug("'%s'", line);
 445         assert_se(streq(line, "foo bar quux"));
 446         line = mfree(line);
 447
 448         assert_se(get_process_cmdline(0, 14, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 449         log_debug("'%s'", line);
 450         assert_se(streq(line, "foo bar quux"));
 451         line = mfree(line);
 452
 453         assert_se(get_process_cmdline(0, 1000, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 454         log_debug("'%s'", line);
 455         assert_se(streq(line, "foo bar quux"));
 456         line = mfree(line);
 457
 458         assert_se(ftruncate(fd, 0) >= 0);
 459         assert_se(prctl(PR_SET_NAME, "aaaa bbbb cccc") >= 0);
 460
 461         assert_se(get_process_cmdline(0, SIZE_MAX, 0, &line) == -ENOENT);
 462
 463         assert_se(get_process_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 464         log_debug("'%s'", line);
 465         assert_se(streq(line, "[aaaa bbbb cccc]"));
 466         line = mfree(line);
 467
 468         assert_se(get_process_cmdline(0, 10, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 469         log_debug("'%s'", line);
 470         assert_se(streq(line, "[aaaa bbb…"));
 471         line = mfree(line);
 472
 473         assert_se(get_process_cmdline(0, 11, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 474         log_debug("'%s'", line);
 475         assert_se(streq(line, "[aaaa bbbb…"));
 476         line = mfree(line);
 477
 478         assert_se(get_process_cmdline(0, 12, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 479         log_debug("'%s'", line);
 480         assert_se(streq(line, "[aaaa bbbb …"));
 481         line = mfree(line);
 482
 483         /* Test with multiple arguments that do require quoting */
 484
 485 #define CMDLINE1 "foo\0'bar'\0\"bar$\"\0x y z\0!``\0"
 486 #define EXPECT1  "foo \"'bar'\" \"\\\"bar\\$\\\"\" \"x y z\" \"!\\`\\`\""
 487 #define EXPECT1p  "foo $'\\'bar\\'' $'\"bar$\"' $'x y z' $'!``'"
 488         assert_se(lseek(fd, SEEK_SET, 0) == 0);
 489         assert_se(write(fd, CMDLINE1, sizeof CMDLINE1) == sizeof CMDLINE1);
 490         assert_se(ftruncate(fd, sizeof CMDLINE1) == 0);
 491
 492         assert_se(get_process_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_QUOTE, &line) >= 0);
 493         log_debug("got: ==%s==", line);
 494         log_debug("exp: ==%s==", EXPECT1);
 495         assert_se(streq(line, EXPECT1));
 496         line = mfree(line);
 497
 498         assert_se(get_process_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_QUOTE_POSIX, &line) >= 0);
 499         log_debug("got: ==%s==", line);
 500         log_debug("exp: ==%s==", EXPECT1p);
 501         assert_se(streq(line, EXPECT1p));
 502         line = mfree(line);
 503
 504 #define CMDLINE2 "foo\0\1\2\3\0\0"
 505 #define EXPECT2  "foo \"\\001\\002\\003\""
 506 #define EXPECT2p  "foo $'\\001\\002\\003'"
 507         assert_se(lseek(fd, SEEK_SET, 0) == 0);
 508         assert_se(write(fd, CMDLINE2, sizeof CMDLINE2) == sizeof CMDLINE2);
 509         assert_se(ftruncate(fd, sizeof CMDLINE2) == 0);
 510
 511         assert_se(get_process_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_QUOTE, &line) >= 0);
 512         log_debug("got: ==%s==", line);
 513         log_debug("exp: ==%s==", EXPECT2);
 514         assert_se(streq(line, EXPECT2));
 515         line = mfree(line);
 516
 517         assert_se(get_process_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_QUOTE_POSIX, &line) >= 0);
 518         log_debug("got: ==%s==", line);
 519         log_debug("exp: ==%s==", EXPECT2p);
 520         assert_se(streq(line, EXPECT2p));
 521         line = mfree(line);
 522
 523         safe_close(fd);
 524         _exit(EXIT_SUCCESS);
 525 }
 526
 527 static void test_rename_process_now(const char *p, int ret) {
 528         _cleanup_free_ char *comm = NULL, *cmdline = NULL;
 529         int r;
 530
 531         log_info("/* %s */", __func__);
 532
 533         r = rename_process(p);
 534         assert_se(r == ret ||
 535                   (ret == 0 && r >= 0) ||
 536                   (ret > 0 && r > 0));
 537
 538         log_debug_errno(r, "rename_process(%s): %m", p);
 539
 540         if (r < 0)
 541                 return;
 542
 543 #if HAVE_VALGRIND_VALGRIND_H
 544         /* see above, valgrind is weird, we can't verify what we are doing here */
 545         if (RUNNING_ON_VALGRIND)
 546                 return;
 547 #endif
 548
 549         assert_se(get_process_comm(0, &comm) >= 0);
 550         log_debug("comm = <%s>", comm);
 551         assert_se(strneq(comm, p, TASK_COMM_LEN-1));
 552         /* We expect comm to be at most 16 bytes (TASK_COMM_LEN). The kernel may raise this limit in the
 553          * future. We'd only check the initial part, at least until we recompile, but this will still pass. */
 554
 555         r = get_process_cmdline(0, SIZE_MAX, 0, &cmdline);
 556         assert_se(r >= 0);
 557         /* we cannot expect cmdline to be renamed properly without privileges */
 558         if (geteuid() == 0) {
 559                 if (r == 0 && detect_container() > 0)
 560                         log_info("cmdline = <%s> (not verified, Running in unprivileged container?)", cmdline);
 561                 else {
 562                         log_info("cmdline = <%s> (expected <%.*s>)", cmdline, (int) strlen("test-process-util"), p);
 563
 564                         bool skip = cmdline[0] == '"'; /* A shortcut to check if the string is quoted */
 565
 566                         assert_se(strneq(cmdline + skip, p, strlen("test-process-util")));
 567                         assert_se(startswith(cmdline + skip, p));
 568                 }
 569         } else
 570                 log_info("cmdline = <%s> (not verified)", cmdline);
 571 }
 572
 573 static void test_rename_process_one(const char *p, int ret) {
 574         siginfo_t si;
 575         pid_t pid;
 576
 577         log_info("/* %s */", __func__);
 578
 579         pid = fork();
 580         assert_se(pid >= 0);
 581
 582         if (pid == 0) {
 583                 /* child */
 584                 test_rename_process_now(p, ret);
 585                 _exit(EXIT_SUCCESS);
 586         }
 587
 588         assert_se(wait_for_terminate(pid, &si) >= 0);
 589         assert_se(si.si_code == CLD_EXITED);
 590         assert_se(si.si_status == EXIT_SUCCESS);
 591 }
 592
 593 TEST(rename_process_multi) {
 594         pid_t pid;
 595
 596         pid = fork();
 597         assert_se(pid >= 0);
 598
 599         if (pid > 0) {
 600                 siginfo_t si;
 601
 602                 assert_se(wait_for_terminate(pid, &si) >= 0);
 603                 assert_se(si.si_code == CLD_EXITED);
 604                 assert_se(si.si_status == EXIT_SUCCESS);
 605
 606                 return;
 607         }
 608
 609         /* child */
 610         test_rename_process_now("one", 1);
 611         test_rename_process_now("more", 0); /* longer than "one", hence truncated */
 612         (void) setresuid(99, 99, 99); /* change uid when running privileged */
 613         test_rename_process_now("time!", 0);
 614         test_rename_process_now("0", 1); /* shorter than "one", should fit */
 615         test_rename_process_one("", -EINVAL);
 616         test_rename_process_one(NULL, -EINVAL);
 617         _exit(EXIT_SUCCESS);
 618 }
 619
 620 TEST(rename_process) {
 621         test_rename_process_one(NULL, -EINVAL);
 622         test_rename_process_one("", -EINVAL);
 623         test_rename_process_one("foo", 1); /* should always fit */
 624         test_rename_process_one("this is a really really long process name, followed by some more words", 0); /* unlikely to fit */
 625         test_rename_process_one("1234567", 1); /* should always fit */
 626 }
 627
 628 TEST(getpid_cached) {
 629         siginfo_t si;
 630         pid_t a, b, c, d, e, f, child;
 631
 632         a = raw_getpid();
 633         b = getpid_cached();
 634         c = getpid();
 635
 636         assert_se(a == b && a == c);
 637
 638         child = fork();
 639         assert_se(child >= 0);
 640
 641         if (child == 0) {
 642                 /* In child */
 643                 a = raw_getpid();
 644                 b = getpid_cached();
 645                 c = getpid();
 646
 647                 assert_se(a == b && a == c);
 648                 _exit(EXIT_SUCCESS);
 649         }
 650
 651         d = raw_getpid();
 652         e = getpid_cached();
 653         f = getpid();
 654
 655         assert_se(a == d && a == e && a == f);
 656
 657         assert_se(wait_for_terminate(child, &si) >= 0);
 658         assert_se(si.si_status == 0);
 659         assert_se(si.si_code == CLD_EXITED);
 660 }
 661
 662 TEST(getpid_measure) {
 663         usec_t t, q;
 664
 665         unsigned long long iterations = slow_tests_enabled() ? 1000000 : 1000;
 666
 667         log_info("/* %s (%llu iterations) */", __func__, iterations);
 668
 669         t = now(CLOCK_MONOTONIC);
 670         for (unsigned long long i = 0; i < iterations; i++)
 671                 (void) getpid();
 672         q = now(CLOCK_MONOTONIC) - t;
 673
 674         log_info(" glibc getpid(): %lf µs each\n", (double) q / iterations);
 675
 676         iterations *= 50; /* _cached() is about 50 times faster, so we need more iterations */
 677
 678         t = now(CLOCK_MONOTONIC);
 679         for (unsigned long long i = 0; i < iterations; i++)
 680                 (void) getpid_cached();
 681         q = now(CLOCK_MONOTONIC) - t;
 682
 683         log_info("getpid_cached(): %lf µs each\n", (double) q / iterations);
 684 }
 685
 686 TEST(safe_fork) {
 687         siginfo_t status;
 688         pid_t pid;
 689         int r;
 690
 691         BLOCK_SIGNALS(SIGCHLD);
 692
 693         r = safe_fork("(test-child)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_DEATHSIG|FORK_NULL_STDIO|FORK_REOPEN_LOG, &pid);
 694         assert_se(r >= 0);
 695
 696         if (r == 0) {
 697                 /* child */
 698                 usleep(100 * USEC_PER_MSEC);
 699
 700                 _exit(88);
 701         }
 702
 703         assert_se(wait_for_terminate(pid, &status) >= 0);
 704         assert_se(status.si_code == CLD_EXITED);
 705         assert_se(status.si_status == 88);
 706 }
 707
 708 TEST(pid_to_ptr) {
 709         assert_se(PTR_TO_PID(NULL) == 0);
 710         assert_se(PID_TO_PTR(0) == NULL);
 711
 712         assert_se(PTR_TO_PID(PID_TO_PTR(1)) == 1);
 713         assert_se(PTR_TO_PID(PID_TO_PTR(2)) == 2);
 714         assert_se(PTR_TO_PID(PID_TO_PTR(-1)) == -1);
 715         assert_se(PTR_TO_PID(PID_TO_PTR(-2)) == -2);
 716
 717         assert_se(PTR_TO_PID(PID_TO_PTR(INT16_MAX)) == INT16_MAX);
 718         assert_se(PTR_TO_PID(PID_TO_PTR(INT16_MIN)) == INT16_MIN);
 719
 720         assert_se(PTR_TO_PID(PID_TO_PTR(INT32_MAX)) == INT32_MAX);
 721         assert_se(PTR_TO_PID(PID_TO_PTR(INT32_MIN)) == INT32_MIN);
 722 }
 723
 724 static void test_ioprio_class_from_to_string_one(const char *val, int expected, int normalized) {
 725         assert_se(ioprio_class_from_string(val) == expected);
 726         if (expected >= 0) {
 727                 _cleanup_free_ char *s = NULL;
 728                 unsigned ret;
 729                 int combined;
 730
 731                 assert_se(ioprio_class_to_string_alloc(expected, &s) == 0);
 732                 /* We sometimes get a class number and sometimes a name back */
 733                 assert_se(streq(s, val) ||
 734                           safe_atou(val, &ret) == 0);
 735
 736                 /* Make sure normalization works, i.e. NONE → BE gets normalized */
 737                 combined = ioprio_normalize(ioprio_prio_value(expected, 0));
 738                 assert_se(ioprio_prio_class(combined) == normalized);
 739                 assert_se(expected != IOPRIO_CLASS_NONE || ioprio_prio_data(combined) == 4);
 740         }
 741 }
 742
 743 TEST(ioprio_class_from_to_string) {
 744         test_ioprio_class_from_to_string_one("none", IOPRIO_CLASS_NONE, IOPRIO_CLASS_BE);
 745         test_ioprio_class_from_to_string_one("realtime", IOPRIO_CLASS_RT, IOPRIO_CLASS_RT);
 746         test_ioprio_class_from_to_string_one("best-effort", IOPRIO_CLASS_BE, IOPRIO_CLASS_BE);
 747         test_ioprio_class_from_to_string_one("idle", IOPRIO_CLASS_IDLE, IOPRIO_CLASS_IDLE);
 748         test_ioprio_class_from_to_string_one("0", IOPRIO_CLASS_NONE, IOPRIO_CLASS_BE);
 749         test_ioprio_class_from_to_string_one("1", 1, 1);
 750         test_ioprio_class_from_to_string_one("7", 7, 7);
 751         test_ioprio_class_from_to_string_one("8", 8, 8);
 752         test_ioprio_class_from_to_string_one("9", -EINVAL, -EINVAL);
 753         test_ioprio_class_from_to_string_one("-1", -EINVAL, -EINVAL);
 754 }
 755
 756 TEST(setpriority_closest) {
 757         int r;
 758
 759         r = safe_fork("(test-setprio)",
 760                       FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_DEATHSIG|FORK_WAIT|FORK_LOG, NULL);
 761         assert_se(r >= 0);
 762
 763         if (r == 0) {
 764                 bool full_test;
 765                 int p, q;
 766                 /* child */
 767
 768                 /* rlimit of 30 equals nice level of -10 */
 769                 if (setrlimit(RLIMIT_NICE, &RLIMIT_MAKE_CONST(30)) < 0) {
 770                         /* If this fails we are probably unprivileged or in a userns of some kind, let's skip
 771                          * the full test */
 772                         assert_se(ERRNO_IS_PRIVILEGE(errno));
 773                         full_test = false;
 774                 } else {
 775                         assert_se(setresgid(GID_NOBODY, GID_NOBODY, GID_NOBODY) >= 0);
 776                         assert_se(setresuid(UID_NOBODY, UID_NOBODY, UID_NOBODY) >= 0);
 777                         full_test = true;
 778                 }
 779
 780                 errno = 0;
 781                 p = getpriority(PRIO_PROCESS, 0);
 782                 assert_se(errno == 0);
 783
 784                 /* It should always be possible to set our nice level to the current one */
 785                 assert_se(setpriority_closest(p) > 0);
 786
 787                 errno = 0;
 788                 q = getpriority(PRIO_PROCESS, 0);
 789                 assert_se(errno == 0 && p == q);
 790
 791                 /* It should also be possible to set the nice level to one higher */
 792                 if (p < PRIO_MAX-1) {
 793                         assert_se(setpriority_closest(++p) > 0);
 794
 795                         errno = 0;
 796                         q = getpriority(PRIO_PROCESS, 0);
 797                         assert_se(errno == 0 && p == q);
 798                 }
 799
 800                 /* It should also be possible to set the nice level to two higher */
 801                 if (p < PRIO_MAX-1) {
 802                         assert_se(setpriority_closest(++p) > 0);
 803
 804                         errno = 0;
 805                         q = getpriority(PRIO_PROCESS, 0);
 806                         assert_se(errno == 0 && p == q);
 807                 }
 808
 809                 if (full_test) {
 810                         /* These two should work, given the RLIMIT_NICE we set above */
 811                         assert_se(setpriority_closest(-10) > 0);
 812                         errno = 0;
 813                         q = getpriority(PRIO_PROCESS, 0);
 814                         assert_se(errno == 0 && q == -10);
 815
 816                         assert_se(setpriority_closest(-9) > 0);
 817                         errno = 0;
 818                         q = getpriority(PRIO_PROCESS, 0);
 819                         assert_se(errno == 0 && q == -9);
 820
 821                         /* This should succeed but should be clamped to the limit */
 822                         assert_se(setpriority_closest(-11) == 0);
 823                         errno = 0;
 824                         q = getpriority(PRIO_PROCESS, 0);
 825                         assert_se(errno == 0 && q == -10);
 826
 827                         assert_se(setpriority_closest(-8) > 0);
 828                         errno = 0;
 829                         q = getpriority(PRIO_PROCESS, 0);
 830                         assert_se(errno == 0 && q == -8);
 831
 832                         /* This should succeed but should be clamped to the limit */
 833                         assert_se(setpriority_closest(-12) == 0);
 834                         errno = 0;
 835                         q = getpriority(PRIO_PROCESS, 0);
 836                         assert_se(errno == 0 && q == -10);
 837                 }
 838
 839                 _exit(EXIT_SUCCESS);
 840         }
 841 }
 842
 843 TEST(get_process_ppid) {
 844         uint64_t limit;
 845         int r;
 846
 847         assert_se(get_process_ppid(1, NULL) == -EADDRNOTAVAIL);
 848
 849         /* the process with the PID above the global limit definitely doesn't exist. Verify that */
 850         assert_se(procfs_get_pid_max(&limit) >= 0);
 851         log_debug("kernel.pid_max = %"PRIu64, limit);
 852
 853         if (limit < INT_MAX) {
 854                 r = get_process_ppid(limit + 1, NULL);
 855                 log_debug_errno(r, "get_process_limit(%"PRIu64") → %d/%m", limit + 1, r);
 856                 assert(r == -ESRCH);
 857         }
 858
 859         for (pid_t pid = 0;;) {
 860                 _cleanup_free_ char *c1 = NULL, *c2 = NULL;
 861                 pid_t ppid;
 862
 863                 r = get_process_ppid(pid, &ppid);
 864                 if (r == -EADDRNOTAVAIL) {
 865                         log_info("No further parent PID");
 866                         break;
 867                 }
 868
 869                 assert_se(r >= 0);
 870
 871                 assert_se(get_process_cmdline(pid, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &c1) >= 0);
 872                 assert_se(get_process_cmdline(ppid, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &c2) >= 0);
 873
 874                 log_info("Parent of " PID_FMT " (%s) is " PID_FMT " (%s).", pid, c1, ppid, c2);
 875
 876                 pid = ppid;
 877         }
 878 }
 879
 880 TEST(set_oom_score_adjust) {
 881         int a, b, r;
 882
 883         assert_se(get_oom_score_adjust(&a) >= 0);
 884
 885         r = set_oom_score_adjust(OOM_SCORE_ADJ_MIN);
 886         assert_se(r >= 0 || ERRNO_IS_PRIVILEGE(r));
 887
 888         if (r >= 0) {
 889                 assert_se(get_oom_score_adjust(&b) >= 0);
 890                 assert_se(b == OOM_SCORE_ADJ_MIN);
 891         }
 892
 893         assert_se(set_oom_score_adjust(a) >= 0);
 894         assert_se(get_oom_score_adjust(&b) >= 0);
 895         assert_se(b == a);
 896 }
 897
 898 static int intro(void) {
 899         log_show_color(true);
 900         return EXIT_SUCCESS;
 901 }
 902
 903 DEFINE_TEST_MAIN_WITH_INTRO(LOG_INFO, intro);