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 "dirent-util.h"
  18 #include "errno-list.h"
  19 #include "errno-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 "procfs-util.h"
  28 #include "rlimit-util.h"
  29 #include "signal-util.h"
  30 #include "stdio-util.h"
  31 #include "string-util.h"
  32 #include "terminal-util.h"
  33 #include "tests.h"
  34 #include "user-util.h"
  35 #include "util.h"
  36 #include "virt.h"
  37
  38 static void test_get_process_comm(pid_t pid) {
  39         struct stat st;
  40         _cleanup_free_ char *a = NULL, *c = NULL, *d = NULL, *f = NULL, *i = NULL;
  41         _cleanup_free_ char *env = NULL;
  42         char path[STRLEN("/proc//comm") + DECIMAL_STR_MAX(pid_t)];
  43         pid_t e;
  44         uid_t u;
  45         gid_t g;
  46         dev_t h;
  47         int r;
  48
  49         log_info("/* %s */", __func__);
  50
  51         xsprintf(path, "/proc/"PID_FMT"/comm", pid);
  52
  53         if (stat(path, &st) == 0) {
  54                 assert_se(get_process_comm(pid, &a) >= 0);
  55                 log_info("PID"PID_FMT" comm: '%s'", pid, a);
  56         } else
  57                 log_warning("%s not exist.", path);
  58
  59         assert_se(get_process_cmdline(pid, 0, PROCESS_CMDLINE_COMM_FALLBACK, &c) >= 0);
  60         log_info("PID"PID_FMT" cmdline: '%s'", pid, c);
  61
  62         assert_se(get_process_cmdline(pid, 8, 0, &d) >= 0);
  63         log_info("PID"PID_FMT" cmdline truncated to 8: '%s'", pid, d);
  64
  65         free(d);
  66         assert_se(get_process_cmdline(pid, 1, 0, &d) >= 0);
  67         log_info("PID"PID_FMT" cmdline truncated to 1: '%s'", pid, d);
  68
  69         r = get_process_ppid(pid, &e);
  70         assert_se(pid == 1 ? r == -EADDRNOTAVAIL : r >= 0);
  71         if (r >= 0) {
  72                 log_info("PID"PID_FMT" PPID: "PID_FMT, pid, e);
  73                 assert_se(e > 0);
  74         }
  75
  76         assert_se(is_kernel_thread(pid) == 0 || pid != 1);
  77
  78         r = get_process_exe(pid, &f);
  79         assert_se(r >= 0 || r == -EACCES);
  80         log_info("PID"PID_FMT" exe: '%s'", pid, strna(f));
  81
  82         assert_se(get_process_uid(pid, &u) == 0);
  83         log_info("PID"PID_FMT" UID: "UID_FMT, pid, u);
  84
  85         assert_se(get_process_gid(pid, &g) == 0);
  86         log_info("PID"PID_FMT" GID: "GID_FMT, pid, g);
  87
  88         r = get_process_environ(pid, &env);
  89         assert_se(r >= 0 || r == -EACCES);
  90         log_info("PID"PID_FMT" strlen(environ): %zi", pid, env ? (ssize_t)strlen(env) : (ssize_t)-errno);
  91
  92         if (!detect_container())
  93                 assert_se(get_ctty_devnr(pid, &h) == -ENXIO || pid != 1);
  94
  95         (void) getenv_for_pid(pid, "PATH", &i);
  96         log_info("PID"PID_FMT" $PATH: '%s'", pid, strna(i));
  97 }
  98
  99 static void test_get_process_cmdline_one(pid_t pid) {
 100         _cleanup_free_ char *c = NULL, *d = NULL, *e = NULL, *f = NULL, *g = NULL, *h = NULL;
 101         int r;
 102
 103         r = get_process_cmdline(pid, SIZE_MAX, 0, &c);
 104         log_info("PID "PID_FMT": %s", pid, r >= 0 ? c : errno_to_name(r));
 105
 106         r = get_process_cmdline(pid, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &d);
 107         log_info("      %s", r >= 0 ? d : errno_to_name(r));
 108
 109         r = get_process_cmdline(pid, SIZE_MAX, PROCESS_CMDLINE_QUOTE, &e);
 110         log_info("      %s", r >= 0 ? e : errno_to_name(r));
 111
 112         r = get_process_cmdline(pid, SIZE_MAX, PROCESS_CMDLINE_QUOTE | PROCESS_CMDLINE_COMM_FALLBACK, &f);
 113         log_info("      %s", r >= 0 ? f : errno_to_name(r));
 114
 115         r = get_process_cmdline(pid, SIZE_MAX, PROCESS_CMDLINE_QUOTE_POSIX, &g);
 116         log_info("      %s", r >= 0 ? g : errno_to_name(r));
 117
 118         r = get_process_cmdline(pid, SIZE_MAX, PROCESS_CMDLINE_QUOTE_POSIX | PROCESS_CMDLINE_COMM_FALLBACK, &h);
 119         log_info("      %s", r >= 0 ? h : errno_to_name(r));
 120 }
 121
 122 static void test_get_process_cmdline(void) {
 123         _cleanup_closedir_ DIR *d = NULL;
 124         struct dirent *de;
 125
 126         log_info("/* %s */", __func__);
 127
 128         assert_se(d = opendir("/proc"));
 129
 130         FOREACH_DIRENT(de, d, return) {
 131                 pid_t pid;
 132
 133                 if (de->d_type != DT_DIR)
 134                         continue;
 135
 136                 if (parse_pid(de->d_name, &pid) < 0)
 137                         continue;
 138
 139                 test_get_process_cmdline_one(pid);
 140         }
 141 }
 142
 143 static void test_get_process_comm_escape_one(const char *input, const char *output) {
 144         _cleanup_free_ char *n = NULL;
 145
 146         log_debug("input: <%s> — output: <%s>", input, output);
 147
 148         assert_se(prctl(PR_SET_NAME, input) >= 0);
 149         assert_se(get_process_comm(0, &n) >= 0);
 150
 151         log_debug("got: <%s>", n);
 152
 153         assert_se(streq_ptr(n, output));
 154 }
 155
 156 static void test_get_process_comm_escape(void) {
 157         _cleanup_free_ char *saved = NULL;
 158
 159         log_info("/* %s */", __func__);
 160
 161         assert_se(get_process_comm(0, &saved) >= 0);
 162
 163         test_get_process_comm_escape_one("", "");
 164         test_get_process_comm_escape_one("foo", "foo");
 165         test_get_process_comm_escape_one("012345678901234", "012345678901234");
 166         test_get_process_comm_escape_one("0123456789012345", "012345678901234");
 167         test_get_process_comm_escape_one("äöüß", "\\303\\244\\303\\266\\303\\274\\303\\237");
 168         test_get_process_comm_escape_one("xäöüß", "x\\303\\244\\303\\266\\303\\274\\303\\237");
 169         test_get_process_comm_escape_one("xxäöüß", "xx\\303\\244\\303\\266\\303\\274\\303\\237");
 170         test_get_process_comm_escape_one("xxxäöüß", "xxx\\303\\244\\303\\266\\303\\274\\303\\237");
 171         test_get_process_comm_escape_one("xxxxäöüß", "xxxx\\303\\244\\303\\266\\303\\274\\303\\237");
 172         test_get_process_comm_escape_one("xxxxxäöüß", "xxxxx\\303\\244\\303\\266\\303\\274\\303\\237");
 173
 174         assert_se(prctl(PR_SET_NAME, saved) >= 0);
 175 }
 176
 177 static void test_pid_is_unwaited(void) {
 178         pid_t pid;
 179
 180         pid = fork();
 181         assert_se(pid >= 0);
 182         if (pid == 0) {
 183                 _exit(EXIT_SUCCESS);
 184         } else {
 185                 int status;
 186
 187                 waitpid(pid, &status, 0);
 188                 assert_se(!pid_is_unwaited(pid));
 189         }
 190         assert_se(pid_is_unwaited(getpid_cached()));
 191         assert_se(!pid_is_unwaited(-1));
 192 }
 193
 194 static void test_pid_is_alive(void) {
 195         pid_t pid;
 196
 197         log_info("/* %s */", __func__);
 198
 199         pid = fork();
 200         assert_se(pid >= 0);
 201         if (pid == 0) {
 202                 _exit(EXIT_SUCCESS);
 203         } else {
 204                 int status;
 205
 206                 waitpid(pid, &status, 0);
 207                 assert_se(!pid_is_alive(pid));
 208         }
 209         assert_se(pid_is_alive(getpid_cached()));
 210         assert_se(!pid_is_alive(-1));
 211 }
 212
 213 static void test_personality(void) {
 214         log_info("/* %s */", __func__);
 215
 216         assert_se(personality_to_string(PER_LINUX));
 217         assert_se(!personality_to_string(PERSONALITY_INVALID));
 218
 219         assert_se(streq(personality_to_string(PER_LINUX), architecture_to_string(native_architecture())));
 220
 221         assert_se(personality_from_string(personality_to_string(PER_LINUX)) == PER_LINUX);
 222         assert_se(personality_from_string(architecture_to_string(native_architecture())) == PER_LINUX);
 223
 224 #ifdef __x86_64__
 225         assert_se(streq_ptr(personality_to_string(PER_LINUX), "x86-64"));
 226         assert_se(streq_ptr(personality_to_string(PER_LINUX32), "x86"));
 227
 228         assert_se(personality_from_string("x86-64") == PER_LINUX);
 229         assert_se(personality_from_string("x86") == PER_LINUX32);
 230         assert_se(personality_from_string("ia64") == PERSONALITY_INVALID);
 231         assert_se(personality_from_string(NULL) == PERSONALITY_INVALID);
 232
 233         assert_se(personality_from_string(personality_to_string(PER_LINUX32)) == PER_LINUX32);
 234 #endif
 235 }
 236
 237 static void test_get_process_cmdline_harder(void) {
 238         char path[] = "/tmp/test-cmdlineXXXXXX";
 239         _cleanup_close_ int fd = -1;
 240         _cleanup_free_ char *line = NULL;
 241         pid_t pid;
 242
 243         log_info("/* %s */", __func__);
 244
 245         if (geteuid() != 0) {
 246                 log_info("Skipping %s: not root", __func__);
 247                 return;
 248         }
 249
 250         if (!have_namespaces()) {
 251                 log_notice("Testing without namespaces, skipping %s", __func__);
 252                 return;
 253         }
 254
 255 #if HAVE_VALGRIND_VALGRIND_H
 256         /* valgrind patches open(/proc//cmdline)
 257          * so, test_get_process_cmdline_harder fails always
 258          * See https://github.com/systemd/systemd/pull/3555#issuecomment-226564908 */
 259         if (RUNNING_ON_VALGRIND) {
 260                 log_info("Skipping %s: running on valgrind", __func__);
 261                 return;
 262         }
 263 #endif
 264
 265         pid = fork();
 266         if (pid > 0) {
 267                 siginfo_t si;
 268
 269                 (void) wait_for_terminate(pid, &si);
 270
 271                 assert_se(si.si_code == CLD_EXITED);
 272                 assert_se(si.si_status == 0);
 273
 274                 return;
 275         }
 276
 277         assert_se(pid == 0);
 278         assert_se(unshare(CLONE_NEWNS) >= 0);
 279
 280         if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL) < 0) {
 281                 log_warning_errno(errno, "mount(..., \"/\", MS_SLAVE|MS_REC, ...) failed: %m");
 282                 assert_se(IN_SET(errno, EPERM, EACCES));
 283                 return;
 284         }
 285
 286         fd = mkostemp(path, O_CLOEXEC);
 287         assert_se(fd >= 0);
 288
 289         /* Note that we don't unmount the following bind-mount at the end of the test because the kernel
 290          * will clear up its /proc/PID/ hierarchy automatically as soon as the test stops. */
 291         if (mount(path, "/proc/self/cmdline", "bind", MS_BIND, NULL) < 0) {
 292                 /* This happens under selinux… Abort the test in this case. */
 293                 log_warning_errno(errno, "mount(..., \"/proc/self/cmdline\", \"bind\", ...) failed: %m");
 294                 assert_se(IN_SET(errno, EPERM, EACCES));
 295                 return;
 296         }
 297
 298         /* Set RLIMIT_STACK to infinity to test we don't try to allocate unncessarily large values to read
 299          * the cmdline. */
 300         if (setrlimit(RLIMIT_STACK, &RLIMIT_MAKE_CONST(RLIM_INFINITY)) < 0)
 301                 log_warning("Testing without RLIMIT_STACK=infinity");
 302
 303         assert_se(unlink(path) >= 0);
 304
 305         assert_se(prctl(PR_SET_NAME, "testa") >= 0);
 306
 307         assert_se(get_process_cmdline(0, SIZE_MAX, 0, &line) == -ENOENT);
 308
 309         assert_se(get_process_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 310         log_debug("'%s'", line);
 311         assert_se(streq(line, "[testa]"));
 312         line = mfree(line);
 313
 314         assert_se(get_process_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK | PROCESS_CMDLINE_QUOTE, &line) >= 0);
 315         log_debug("'%s'", line);
 316         assert_se(streq(line, "\"[testa]\"")); /* quoting is enabled here */
 317         line = mfree(line);
 318
 319         assert_se(get_process_cmdline(0, 0, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 320         log_debug("'%s'", line);
 321         assert_se(streq(line, ""));
 322         line = mfree(line);
 323
 324         assert_se(get_process_cmdline(0, 1, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 325         assert_se(streq(line, "…"));
 326         line = mfree(line);
 327
 328         assert_se(get_process_cmdline(0, 2, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 329         assert_se(streq(line, "[…"));
 330         line = mfree(line);
 331
 332         assert_se(get_process_cmdline(0, 3, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 333         assert_se(streq(line, "[t…"));
 334         line = mfree(line);
 335
 336         assert_se(get_process_cmdline(0, 4, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 337         assert_se(streq(line, "[te…"));
 338         line = mfree(line);
 339
 340         assert_se(get_process_cmdline(0, 5, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 341         assert_se(streq(line, "[tes…"));
 342         line = mfree(line);
 343
 344         assert_se(get_process_cmdline(0, 6, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 345         assert_se(streq(line, "[test…"));
 346         line = mfree(line);
 347
 348         assert_se(get_process_cmdline(0, 7, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 349         assert_se(streq(line, "[testa]"));
 350         line = mfree(line);
 351
 352         assert_se(get_process_cmdline(0, 8, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 353         assert_se(streq(line, "[testa]"));
 354         line = mfree(line);
 355
 356         /* Test with multiple arguments that don't require quoting */
 357
 358         assert_se(write(fd, "foo\0bar", 8) == 8);
 359
 360         assert_se(get_process_cmdline(0, SIZE_MAX, 0, &line) >= 0);
 361         log_debug("'%s'", line);
 362         assert_se(streq(line, "foo bar"));
 363         line = mfree(line);
 364
 365         assert_se(get_process_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 366         assert_se(streq(line, "foo bar"));
 367         line = mfree(line);
 368
 369         assert_se(write(fd, "quux", 4) == 4);
 370         assert_se(get_process_cmdline(0, SIZE_MAX, 0, &line) >= 0);
 371         log_debug("'%s'", line);
 372         assert_se(streq(line, "foo bar quux"));
 373         line = mfree(line);
 374
 375         assert_se(get_process_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 376         log_debug("'%s'", line);
 377         assert_se(streq(line, "foo bar quux"));
 378         line = mfree(line);
 379
 380         assert_se(get_process_cmdline(0, 1, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 381         log_debug("'%s'", line);
 382         assert_se(streq(line, "…"));
 383         line = mfree(line);
 384
 385         assert_se(get_process_cmdline(0, 2, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 386         log_debug("'%s'", line);
 387         assert_se(streq(line, "f…"));
 388         line = mfree(line);
 389
 390         assert_se(get_process_cmdline(0, 3, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 391         log_debug("'%s'", line);
 392         assert_se(streq(line, "fo…"));
 393         line = mfree(line);
 394
 395         assert_se(get_process_cmdline(0, 4, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 396         log_debug("'%s'", line);
 397         assert_se(streq(line, "foo…"));
 398         line = mfree(line);
 399
 400         assert_se(get_process_cmdline(0, 5, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 401         log_debug("'%s'", line);
 402         assert_se(streq(line, "foo …"));
 403         line = mfree(line);
 404
 405         assert_se(get_process_cmdline(0, 6, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 406         log_debug("'%s'", line);
 407         assert_se(streq(line, "foo b…"));
 408         line = mfree(line);
 409
 410         assert_se(get_process_cmdline(0, 7, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 411         log_debug("'%s'", line);
 412         assert_se(streq(line, "foo ba…"));
 413         line = mfree(line);
 414
 415         assert_se(get_process_cmdline(0, 8, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 416         log_debug("'%s'", line);
 417         assert_se(streq(line, "foo bar…"));
 418         line = mfree(line);
 419
 420         assert_se(get_process_cmdline(0, 9, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 421         log_debug("'%s'", line);
 422         assert_se(streq(line, "foo bar …"));
 423         line = mfree(line);
 424
 425         assert_se(get_process_cmdline(0, 10, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 426         log_debug("'%s'", line);
 427         assert_se(streq(line, "foo bar q…"));
 428         line = mfree(line);
 429
 430         assert_se(get_process_cmdline(0, 11, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 431         log_debug("'%s'", line);
 432         assert_se(streq(line, "foo bar qu…"));
 433         line = mfree(line);
 434
 435         assert_se(get_process_cmdline(0, 12, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 436         log_debug("'%s'", line);
 437         assert_se(streq(line, "foo bar quux"));
 438         line = mfree(line);
 439
 440         assert_se(get_process_cmdline(0, 13, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 441         log_debug("'%s'", line);
 442         assert_se(streq(line, "foo bar quux"));
 443         line = mfree(line);
 444
 445         assert_se(get_process_cmdline(0, 14, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 446         log_debug("'%s'", line);
 447         assert_se(streq(line, "foo bar quux"));
 448         line = mfree(line);
 449
 450         assert_se(get_process_cmdline(0, 1000, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 451         log_debug("'%s'", line);
 452         assert_se(streq(line, "foo bar quux"));
 453         line = mfree(line);
 454
 455         assert_se(ftruncate(fd, 0) >= 0);
 456         assert_se(prctl(PR_SET_NAME, "aaaa bbbb cccc") >= 0);
 457
 458         assert_se(get_process_cmdline(0, SIZE_MAX, 0, &line) == -ENOENT);
 459
 460         assert_se(get_process_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 461         log_debug("'%s'", line);
 462         assert_se(streq(line, "[aaaa bbbb cccc]"));
 463         line = mfree(line);
 464
 465         assert_se(get_process_cmdline(0, 10, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 466         log_debug("'%s'", line);
 467         assert_se(streq(line, "[aaaa bbb…"));
 468         line = mfree(line);
 469
 470         assert_se(get_process_cmdline(0, 11, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 471         log_debug("'%s'", line);
 472         assert_se(streq(line, "[aaaa bbbb…"));
 473         line = mfree(line);
 474
 475         assert_se(get_process_cmdline(0, 12, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
 476         log_debug("'%s'", line);
 477         assert_se(streq(line, "[aaaa bbbb …"));
 478         line = mfree(line);
 479
 480         /* Test with multiple arguments that do require quoting */
 481
 482 #define CMDLINE1 "foo\0'bar'\0\"bar$\"\0x y z\0!``\0"
 483 #define EXPECT1  "foo \"'bar'\" \"\\\"bar\\$\\\"\" \"x y z\" \"!\\`\\`\" \"\""
 484 #define EXPECT1p  "foo $'\\'bar\\'' $'\"bar$\"' $'x y z' $'!``' \"\""
 485         assert_se(lseek(fd, SEEK_SET, 0) == 0);
 486         assert_se(write(fd, CMDLINE1, sizeof CMDLINE1) == sizeof CMDLINE1);
 487         assert_se(ftruncate(fd, sizeof CMDLINE1) == 0);
 488
 489         assert_se(get_process_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_QUOTE, &line) >= 0);
 490         log_debug("got: ==%s==", line);
 491         log_debug("exp: ==%s==", EXPECT1);
 492         assert_se(streq(line, EXPECT1));
 493         line = mfree(line);
 494
 495         assert_se(get_process_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_QUOTE_POSIX, &line) >= 0);
 496         log_debug("got: ==%s==", line);
 497         log_debug("exp: ==%s==", EXPECT1p);
 498         assert_se(streq(line, EXPECT1p));
 499         line = mfree(line);
 500
 501 #define CMDLINE2 "foo\0\1\2\3\0\0"
 502 #define EXPECT2  "foo \"\\001\\002\\003\" \"\" \"\""
 503 #define EXPECT2p  "foo $'\\001\\002\\003' \"\" \"\""
 504         assert_se(lseek(fd, SEEK_SET, 0) == 0);
 505         assert_se(write(fd, CMDLINE2, sizeof CMDLINE2) == sizeof CMDLINE2);
 506         assert_se(ftruncate(fd, sizeof CMDLINE2) == 0);
 507
 508         assert_se(get_process_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_QUOTE, &line) >= 0);
 509         log_debug("got: ==%s==", line);
 510         log_debug("exp: ==%s==", EXPECT2);
 511         assert_se(streq(line, EXPECT2));
 512         line = mfree(line);
 513
 514         assert_se(get_process_cmdline(0, SIZE_MAX, PROCESS_CMDLINE_QUOTE_POSIX, &line) >= 0);
 515         log_debug("got: ==%s==", line);
 516         log_debug("exp: ==%s==", EXPECT2p);
 517         assert_se(streq(line, EXPECT2p));
 518         line = mfree(line);
 519
 520         safe_close(fd);
 521         _exit(EXIT_SUCCESS);
 522 }
 523
 524 static void test_rename_process_now(const char *p, int ret) {
 525         _cleanup_free_ char *comm = NULL, *cmdline = NULL;
 526         int r;
 527
 528         log_info("/* %s */", __func__);
 529
 530         r = rename_process(p);
 531         assert_se(r == ret ||
 532                   (ret == 0 && r >= 0) ||
 533                   (ret > 0 && r > 0));
 534
 535         log_debug_errno(r, "rename_process(%s): %m", p);
 536
 537         if (r < 0)
 538                 return;
 539
 540 #if HAVE_VALGRIND_VALGRIND_H
 541         /* see above, valgrind is weird, we can't verify what we are doing here */
 542         if (RUNNING_ON_VALGRIND)
 543                 return;
 544 #endif
 545
 546         assert_se(get_process_comm(0, &comm) >= 0);
 547         log_debug("comm = <%s>", comm);
 548         assert_se(strneq(comm, p, TASK_COMM_LEN-1));
 549         /* We expect comm to be at most 16 bytes (TASK_COMM_LEN). The kernel may raise this limit in the
 550          * future. We'd only check the initial part, at least until we recompile, but this will still pass. */
 551
 552         r = get_process_cmdline(0, SIZE_MAX, 0, &cmdline);
 553         assert_se(r >= 0);
 554         /* we cannot expect cmdline to be renamed properly without privileges */
 555         if (geteuid() == 0) {
 556                 if (r == 0 && detect_container() > 0)
 557                         log_info("cmdline = <%s> (not verified, Running in unprivileged container?)", cmdline);
 558                 else {
 559                         log_info("cmdline = <%s> (expected <%.*s>)", cmdline, (int) strlen("test-process-util"), p);
 560
 561                         bool skip = cmdline[0] == '"'; /* A shortcut to check if the string is quoted */
 562
 563                         assert_se(strneq(cmdline + skip, p, strlen("test-process-util")));
 564                         assert_se(startswith(cmdline + skip, p));
 565                 }
 566         } else
 567                 log_info("cmdline = <%s> (not verified)", cmdline);
 568 }
 569
 570 static void test_rename_process_one(const char *p, int ret) {
 571         siginfo_t si;
 572         pid_t pid;
 573
 574         log_info("/* %s */", __func__);
 575
 576         pid = fork();
 577         assert_se(pid >= 0);
 578
 579         if (pid == 0) {
 580                 /* child */
 581                 test_rename_process_now(p, ret);
 582                 _exit(EXIT_SUCCESS);
 583         }
 584
 585         assert_se(wait_for_terminate(pid, &si) >= 0);
 586         assert_se(si.si_code == CLD_EXITED);
 587         assert_se(si.si_status == EXIT_SUCCESS);
 588 }
 589
 590 static void test_rename_process_multi(void) {
 591         pid_t pid;
 592
 593         pid = fork();
 594         assert_se(pid >= 0);
 595
 596         if (pid > 0) {
 597                 siginfo_t si;
 598
 599                 assert_se(wait_for_terminate(pid, &si) >= 0);
 600                 assert_se(si.si_code == CLD_EXITED);
 601                 assert_se(si.si_status == EXIT_SUCCESS);
 602
 603                 return;
 604         }
 605
 606         /* child */
 607         test_rename_process_now("one", 1);
 608         test_rename_process_now("more", 0); /* longer than "one", hence truncated */
 609         (void) setresuid(99, 99, 99); /* change uid when running privileged */
 610         test_rename_process_now("time!", 0);
 611         test_rename_process_now("0", 1); /* shorter than "one", should fit */
 612         test_rename_process_one("", -EINVAL);
 613         test_rename_process_one(NULL, -EINVAL);
 614         _exit(EXIT_SUCCESS);
 615 }
 616
 617 static void test_rename_process(void) {
 618         test_rename_process_one(NULL, -EINVAL);
 619         test_rename_process_one("", -EINVAL);
 620         test_rename_process_one("foo", 1); /* should always fit */
 621         test_rename_process_one("this is a really really long process name, followed by some more words", 0); /* unlikely to fit */
 622         test_rename_process_one("1234567", 1); /* should always fit */
 623         test_rename_process_multi(); /* multiple invocations and dropped privileges */
 624 }
 625
 626 static void test_getpid_cached(void) {
 627         siginfo_t si;
 628         pid_t a, b, c, d, e, f, child;
 629
 630         log_info("/* %s */", __func__);
 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 static void test_getpid_measure(void) {
 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 static void test_safe_fork(void) {
 687         siginfo_t status;
 688         pid_t pid;
 689         int r;
 690
 691         log_info("/* %s */", __func__);
 692
 693         BLOCK_SIGNALS(SIGCHLD);
 694
 695         r = safe_fork("(test-child)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_DEATHSIG|FORK_NULL_STDIO|FORK_REOPEN_LOG, &pid);
 696         assert_se(r >= 0);
 697
 698         if (r == 0) {
 699                 /* child */
 700                 usleep(100 * USEC_PER_MSEC);
 701
 702                 _exit(88);
 703         }
 704
 705         assert_se(wait_for_terminate(pid, &status) >= 0);
 706         assert_se(status.si_code == CLD_EXITED);
 707         assert_se(status.si_status == 88);
 708 }
 709
 710 static void test_pid_to_ptr(void) {
 711
 712         assert_se(PTR_TO_PID(NULL) == 0);
 713         assert_se(PID_TO_PTR(0) == NULL);
 714
 715         assert_se(PTR_TO_PID(PID_TO_PTR(1)) == 1);
 716         assert_se(PTR_TO_PID(PID_TO_PTR(2)) == 2);
 717         assert_se(PTR_TO_PID(PID_TO_PTR(-1)) == -1);
 718         assert_se(PTR_TO_PID(PID_TO_PTR(-2)) == -2);
 719
 720         assert_se(PTR_TO_PID(PID_TO_PTR(INT16_MAX)) == INT16_MAX);
 721         assert_se(PTR_TO_PID(PID_TO_PTR(INT16_MIN)) == INT16_MIN);
 722
 723         assert_se(PTR_TO_PID(PID_TO_PTR(INT32_MAX)) == INT32_MAX);
 724         assert_se(PTR_TO_PID(PID_TO_PTR(INT32_MIN)) == INT32_MIN);
 725 }
 726
 727 static void test_ioprio_class_from_to_string_one(const char *val, int expected) {
 728         assert_se(ioprio_class_from_string(val) == expected);
 729         if (expected >= 0) {
 730                 _cleanup_free_ char *s = NULL;
 731                 unsigned ret;
 732
 733                 assert_se(ioprio_class_to_string_alloc(expected, &s) == 0);
 734                 /* We sometimes get a class number and sometimes a number back */
 735                 assert_se(streq(s, val) ||
 736                           safe_atou(val, &ret) == 0);
 737         }
 738 }
 739
 740 static void test_ioprio_class_from_to_string(void) {
 741         log_info("/* %s */", __func__);
 742
 743         test_ioprio_class_from_to_string_one("none", IOPRIO_CLASS_NONE);
 744         test_ioprio_class_from_to_string_one("realtime", IOPRIO_CLASS_RT);
 745         test_ioprio_class_from_to_string_one("best-effort", IOPRIO_CLASS_BE);
 746         test_ioprio_class_from_to_string_one("idle", IOPRIO_CLASS_IDLE);
 747         test_ioprio_class_from_to_string_one("0", 0);
 748         test_ioprio_class_from_to_string_one("1", 1);
 749         test_ioprio_class_from_to_string_one("7", 7);
 750         test_ioprio_class_from_to_string_one("8", 8);
 751         test_ioprio_class_from_to_string_one("9", -EINVAL);
 752         test_ioprio_class_from_to_string_one("-1", -EINVAL);
 753 }
 754
 755 static void test_setpriority_closest(void) {
 756         int r;
 757
 758         log_info("/* %s */", __func__);
 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 static void test_get_process_ppid(void) {
 845         uint64_t limit;
 846         int r;
 847
 848         log_info("/* %s */", __func__);
 849
 850         assert_se(get_process_ppid(1, NULL) == -EADDRNOTAVAIL);
 851
 852         /* the process with the PID above the global limit definitely doesn't exist. Verify that */
 853         assert_se(procfs_tasks_get_limit(&limit) >= 0);
 854         assert_se(limit >= INT_MAX || get_process_ppid(limit+1, NULL) == -ESRCH);
 855
 856         for (pid_t pid = 0;;) {
 857                 _cleanup_free_ char *c1 = NULL, *c2 = NULL;
 858                 pid_t ppid;
 859
 860                 r = get_process_ppid(pid, &ppid);
 861                 if (r == -EADDRNOTAVAIL) {
 862                         log_info("No further parent PID");
 863                         break;
 864                 }
 865
 866                 assert_se(r >= 0);
 867
 868                 assert_se(get_process_cmdline(pid, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &c1) >= 0);
 869                 assert_se(get_process_cmdline(ppid, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &c2) >= 0);
 870
 871                 log_info("Parent of " PID_FMT " (%s) is " PID_FMT " (%s).", pid, c1, ppid, c2);
 872
 873                 pid = ppid;
 874         }
 875 }
 876
 877 int main(int argc, char *argv[]) {
 878         log_show_color(true);
 879         test_setup_logging(LOG_INFO);
 880
 881         save_argc_argv(argc, argv);
 882
 883         if (argc > 1) {
 884                 pid_t pid = 0;
 885
 886                 (void) parse_pid(argv[1], &pid);
 887                 test_get_process_comm(pid);
 888         } else {
 889                 TEST_REQ_RUNNING_SYSTEMD(test_get_process_comm(1));
 890                 test_get_process_comm(getpid());
 891         }
 892
 893         test_get_process_comm_escape();
 894         test_get_process_cmdline();
 895         test_pid_is_unwaited();
 896         test_pid_is_alive();
 897         test_personality();
 898         test_get_process_cmdline_harder();
 899         test_rename_process();
 900         test_getpid_cached();
 901         test_getpid_measure();
 902         test_safe_fork();
 903         test_pid_to_ptr();
 904         test_ioprio_class_from_to_string();
 905         test_setpriority_closest();
 906         test_get_process_ppid();
 907
 908         return 0;
 909 }