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