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