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Systemd/src/test/test-process-util.c

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/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
Copyright 2013 Thomas H.P. Andersen
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <sched.h>
#include <sys/mount.h>
#include <sys/personality.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#if HAVE_VALGRIND_VALGRIND_H
#include <valgrind/valgrind.h>
#endif
#include "alloc-util.h"
#include "architecture.h"
#include "fd-util.h"
#include "log.h"
#include "macro.h"
#include "parse-util.h"
#include "process-util.h"
#include "signal-util.h"
#include "stdio-util.h"
#include "string-util.h"
#include "terminal-util.h"
#include "test-helper.h"
#include "util.h"
#include "virt.h"
static void test_get_process_comm(pid_t pid) {
struct stat st;
_cleanup_free_ char *a = NULL, *c = NULL, *d = NULL, *f = NULL, *i = NULL;
_cleanup_free_ char *env = NULL;
char path[STRLEN("/proc//comm") + DECIMAL_STR_MAX(pid_t)];
pid_t e;
uid_t u;
gid_t g;
dev_t h;
int r;
xsprintf(path, "/proc/"PID_FMT"/comm", pid);
if (stat(path, &st) == 0) {
assert_se(get_process_comm(pid, &a) >= 0);
log_info("PID"PID_FMT" comm: '%s'", pid, a);
} else
log_warning("%s not exist.", path);
assert_se(get_process_cmdline(pid, 0, true, &c) >= 0);
log_info("PID"PID_FMT" cmdline: '%s'", pid, c);
assert_se(get_process_cmdline(pid, 8, false, &d) >= 0);
log_info("PID"PID_FMT" cmdline truncated to 8: '%s'", pid, d);
free(d);
assert_se(get_process_cmdline(pid, 1, false, &d) >= 0);
log_info("PID"PID_FMT" cmdline truncated to 1: '%s'", pid, d);
assert_se(get_process_ppid(pid, &e) >= 0);
log_info("PID"PID_FMT" PPID: "PID_FMT, pid, e);
assert_se(pid == 1 ? e == 0 : e > 0);
assert_se(is_kernel_thread(pid) == 0 || pid != 1);
r = get_process_exe(pid, &f);
assert_se(r >= 0 || r == -EACCES);
log_info("PID"PID_FMT" exe: '%s'", pid, strna(f));
assert_se(get_process_uid(pid, &u) == 0);
log_info("PID"PID_FMT" UID: "UID_FMT, pid, u);
assert_se(u == 0 || pid != 1);
assert_se(get_process_gid(pid, &g) == 0);
log_info("PID"PID_FMT" GID: "GID_FMT, pid, g);
assert_se(g == 0 || pid != 1);
r = get_process_environ(pid, &env);
assert_se(r >= 0 || r == -EACCES);
log_info("PID"PID_FMT" strlen(environ): %zi", pid, env ? (ssize_t)strlen(env) : (ssize_t)-errno);
if (!detect_container())
assert_se(get_ctty_devnr(pid, &h) == -ENXIO || pid != 1);
getenv_for_pid(pid, "PATH", &i);
log_info("PID"PID_FMT" $PATH: '%s'", pid, strna(i));
}
static void test_pid_is_unwaited(void) {
pid_t pid;
pid = fork();
assert_se(pid >= 0);
if (pid == 0) {
_exit(EXIT_SUCCESS);
} else {
int status;
waitpid(pid, &status, 0);
assert_se(!pid_is_unwaited(pid));
}
assert_se(pid_is_unwaited(getpid_cached()));
assert_se(!pid_is_unwaited(-1));
}
static void test_pid_is_alive(void) {
pid_t pid;
pid = fork();
assert_se(pid >= 0);
if (pid == 0) {
_exit(EXIT_SUCCESS);
} else {
int status;
waitpid(pid, &status, 0);
assert_se(!pid_is_alive(pid));
}
assert_se(pid_is_alive(getpid_cached()));
assert_se(!pid_is_alive(-1));
}
static void test_personality(void) {
assert_se(personality_to_string(PER_LINUX));
assert_se(!personality_to_string(PERSONALITY_INVALID));
assert_se(streq(personality_to_string(PER_LINUX), architecture_to_string(native_architecture())));
assert_se(personality_from_string(personality_to_string(PER_LINUX)) == PER_LINUX);
assert_se(personality_from_string(architecture_to_string(native_architecture())) == PER_LINUX);
#ifdef __x86_64__
assert_se(streq_ptr(personality_to_string(PER_LINUX), "x86-64"));
assert_se(streq_ptr(personality_to_string(PER_LINUX32), "x86"));
assert_se(personality_from_string("x86-64") == PER_LINUX);
assert_se(personality_from_string("x86") == PER_LINUX32);
assert_se(personality_from_string("ia64") == PERSONALITY_INVALID);
assert_se(personality_from_string(NULL) == PERSONALITY_INVALID);
assert_se(personality_from_string(personality_to_string(PER_LINUX32)) == PER_LINUX32);
#endif
}
static void test_get_process_cmdline_harder(void) {
char path[] = "/tmp/test-cmdlineXXXXXX";
_cleanup_close_ int fd = -1;
_cleanup_free_ char *line = NULL;
pid_t pid;
if (geteuid() != 0)
return;
#if HAVE_VALGRIND_VALGRIND_H
/* valgrind patches open(/proc//cmdline)
* so, test_get_process_cmdline_harder fails always
* See https://github.com/systemd/systemd/pull/3555#issuecomment-226564908 */
if (RUNNING_ON_VALGRIND)
return;
#endif
pid = fork();
if (pid > 0) {
siginfo_t si;
(void) wait_for_terminate(pid, &si);
assert_se(si.si_code == CLD_EXITED);
assert_se(si.si_status == 0);
return;
}
assert_se(pid == 0);
assert_se(unshare(CLONE_NEWNS) >= 0);
fd = mkostemp(path, O_CLOEXEC);
assert_se(fd >= 0);
if (mount(path, "/proc/self/cmdline", "bind", MS_BIND, NULL) < 0) {
/* This happens under selinux… Abort the test in this case. */
log_warning_errno(errno, "mount(..., \"/proc/self/cmdline\", \"bind\", ...) failed: %m");
assert(errno == EACCES);
return;
}
assert_se(unlink(path) >= 0);
assert_se(prctl(PR_SET_NAME, "testa") >= 0);
assert_se(get_process_cmdline(getpid_cached(), 0, false, &line) == -ENOENT);
assert_se(get_process_cmdline(getpid_cached(), 0, true, &line) >= 0);
assert_se(streq(line, "[testa]"));
line = mfree(line);
assert_se(get_process_cmdline(getpid_cached(), 1, true, &line) >= 0);
assert_se(streq(line, ""));
line = mfree(line);
assert_se(get_process_cmdline(getpid_cached(), 2, true, &line) >= 0);
assert_se(streq(line, "["));
line = mfree(line);
assert_se(get_process_cmdline(getpid_cached(), 3, true, &line) >= 0);
assert_se(streq(line, "[."));
line = mfree(line);
assert_se(get_process_cmdline(getpid_cached(), 4, true, &line) >= 0);
assert_se(streq(line, "[.."));
line = mfree(line);
assert_se(get_process_cmdline(getpid_cached(), 5, true, &line) >= 0);
assert_se(streq(line, "[..."));
line = mfree(line);
assert_se(get_process_cmdline(getpid_cached(), 6, true, &line) >= 0);
assert_se(streq(line, "[...]"));
line = mfree(line);
assert_se(get_process_cmdline(getpid_cached(), 7, true, &line) >= 0);
assert_se(streq(line, "[t...]"));
line = mfree(line);
assert_se(get_process_cmdline(getpid_cached(), 8, true, &line) >= 0);
assert_se(streq(line, "[testa]"));
line = mfree(line);
assert_se(write(fd, "\0\0\0\0\0\0\0\0\0", 10) == 10);
assert_se(get_process_cmdline(getpid_cached(), 0, false, &line) == -ENOENT);
assert_se(get_process_cmdline(getpid_cached(), 0, true, &line) >= 0);
assert_se(streq(line, "[testa]"));
line = mfree(line);
assert_se(write(fd, "foo\0bar\0\0\0\0\0", 10) == 10);
assert_se(get_process_cmdline(getpid_cached(), 0, false, &line) >= 0);
assert_se(streq(line, "foo bar"));
line = mfree(line);
assert_se(get_process_cmdline(getpid_cached(), 0, true, &line) >= 0);
assert_se(streq(line, "foo bar"));
line = mfree(line);
assert_se(write(fd, "quux", 4) == 4);
assert_se(get_process_cmdline(getpid_cached(), 0, false, &line) >= 0);
assert_se(streq(line, "foo bar quux"));
line = mfree(line);
assert_se(get_process_cmdline(getpid_cached(), 0, true, &line) >= 0);
assert_se(streq(line, "foo bar quux"));
line = mfree(line);
assert_se(get_process_cmdline(getpid_cached(), 1, true, &line) >= 0);
assert_se(streq(line, ""));
line = mfree(line);
assert_se(get_process_cmdline(getpid_cached(), 2, true, &line) >= 0);
assert_se(streq(line, "."));
line = mfree(line);
assert_se(get_process_cmdline(getpid_cached(), 3, true, &line) >= 0);
assert_se(streq(line, ".."));
line = mfree(line);
assert_se(get_process_cmdline(getpid_cached(), 4, true, &line) >= 0);
assert_se(streq(line, "..."));
line = mfree(line);
assert_se(get_process_cmdline(getpid_cached(), 5, true, &line) >= 0);
assert_se(streq(line, "f..."));
line = mfree(line);
assert_se(get_process_cmdline(getpid_cached(), 6, true, &line) >= 0);
assert_se(streq(line, "fo..."));
line = mfree(line);
assert_se(get_process_cmdline(getpid_cached(), 7, true, &line) >= 0);
assert_se(streq(line, "foo..."));
line = mfree(line);
assert_se(get_process_cmdline(getpid_cached(), 8, true, &line) >= 0);
assert_se(streq(line, "foo..."));
line = mfree(line);
assert_se(get_process_cmdline(getpid_cached(), 9, true, &line) >= 0);
assert_se(streq(line, "foo b..."));
line = mfree(line);
assert_se(get_process_cmdline(getpid_cached(), 10, true, &line) >= 0);
assert_se(streq(line, "foo ba..."));
line = mfree(line);
assert_se(get_process_cmdline(getpid_cached(), 11, true, &line) >= 0);
assert_se(streq(line, "foo bar..."));
line = mfree(line);
assert_se(get_process_cmdline(getpid_cached(), 12, true, &line) >= 0);
assert_se(streq(line, "foo bar..."));
line = mfree(line);
assert_se(get_process_cmdline(getpid_cached(), 13, true, &line) >= 0);
assert_se(streq(line, "foo bar quux"));
line = mfree(line);
assert_se(get_process_cmdline(getpid_cached(), 14, true, &line) >= 0);
assert_se(streq(line, "foo bar quux"));
line = mfree(line);
assert_se(get_process_cmdline(getpid_cached(), 1000, true, &line) >= 0);
assert_se(streq(line, "foo bar quux"));
line = mfree(line);
assert_se(ftruncate(fd, 0) >= 0);
assert_se(prctl(PR_SET_NAME, "aaaa bbbb cccc") >= 0);
assert_se(get_process_cmdline(getpid_cached(), 0, false, &line) == -ENOENT);
assert_se(get_process_cmdline(getpid_cached(), 0, true, &line) >= 0);
assert_se(streq(line, "[aaaa bbbb cccc]"));
line = mfree(line);
assert_se(get_process_cmdline(getpid_cached(), 10, true, &line) >= 0);
assert_se(streq(line, "[aaaa...]"));
line = mfree(line);
assert_se(get_process_cmdline(getpid_cached(), 11, true, &line) >= 0);
assert_se(streq(line, "[aaaa...]"));
line = mfree(line);
assert_se(get_process_cmdline(getpid_cached(), 12, true, &line) >= 0);
assert_se(streq(line, "[aaaa b...]"));
line = mfree(line);
safe_close(fd);
_exit(EXIT_SUCCESS);
}
static void test_rename_process_now(const char *p, int ret) {
_cleanup_free_ char *comm = NULL, *cmdline = NULL;
int r;
r = rename_process(p);
assert_se(r == ret ||
(ret == 0 && r >= 0) ||
(ret > 0 && r > 0));
if (r < 0)
return;
#if HAVE_VALGRIND_VALGRIND_H
/* see above, valgrind is weird, we can't verify what we are doing here */
if (RUNNING_ON_VALGRIND)
return;
#endif
assert_se(get_process_comm(0, &comm) >= 0);
log_info("comm = <%s>", comm);
assert_se(strneq(comm, p, 15));
assert_se(get_process_cmdline(0, 0, false, &cmdline) >= 0);
/* we cannot expect cmdline to be renamed properly without privileges */
if (geteuid() == 0) {
log_info("cmdline = <%s>", cmdline);
assert_se(strneq(p, cmdline, STRLEN("test-process-util")));
assert_se(startswith(p, cmdline));
} else
log_info("cmdline = <%s> (not verified)", cmdline);
}
static void test_rename_process_one(const char *p, int ret) {
siginfo_t si;
pid_t pid;
pid = fork();
assert_se(pid >= 0);
if (pid == 0) {
/* child */
test_rename_process_now(p, ret);
_exit(EXIT_SUCCESS);
}
assert_se(wait_for_terminate(pid, &si) >= 0);
assert_se(si.si_code == CLD_EXITED);
assert_se(si.si_status == EXIT_SUCCESS);
}
static void test_rename_process_multi(void) {
pid_t pid;
pid = fork();
assert_se(pid >= 0);
if (pid > 0) {
siginfo_t si;
assert_se(wait_for_terminate(pid, &si) >= 0);
assert_se(si.si_code == CLD_EXITED);
assert_se(si.si_status == EXIT_SUCCESS);
return;
}
/* child */
test_rename_process_now("one", 1);
test_rename_process_now("more", 0); /* longer than "one", hence truncated */
(void) setresuid(99, 99, 99); /* change uid when running privileged */
test_rename_process_now("time!", 0);
test_rename_process_now("0", 1); /* shorter than "one", should fit */
test_rename_process_one("", -EINVAL);
test_rename_process_one(NULL, -EINVAL);
_exit(EXIT_SUCCESS);
}
static void test_rename_process(void) {
test_rename_process_one(NULL, -EINVAL);
test_rename_process_one("", -EINVAL);
test_rename_process_one("foo", 1); /* should always fit */
test_rename_process_one("this is a really really long process name, followed by some more words", 0); /* unlikely to fit */
test_rename_process_one("1234567", 1); /* should always fit */
test_rename_process_multi(); /* multiple invocations and dropped privileges */
}
static void test_getpid_cached(void) {
siginfo_t si;
pid_t a, b, c, d, e, f, child;
a = raw_getpid();
b = getpid_cached();
c = getpid();
assert_se(a == b && a == c);
child = fork();
assert_se(child >= 0);
if (child == 0) {
/* In child */
a = raw_getpid();
b = getpid_cached();
c = getpid();
assert_se(a == b && a == c);
_exit(EXIT_SUCCESS);
}
d = raw_getpid();
e = getpid_cached();
f = getpid();
assert_se(a == d && a == e && a == f);
assert_se(wait_for_terminate(child, &si) >= 0);
assert_se(si.si_status == 0);
assert_se(si.si_code == CLD_EXITED);
}
#define MEASURE_ITERATIONS (10000000LLU)
static void test_getpid_measure(void) {
unsigned long long i;
usec_t t, q;
t = now(CLOCK_MONOTONIC);
for (i = 0; i < MEASURE_ITERATIONS; i++)
(void) getpid();
q = now(CLOCK_MONOTONIC) - t;
log_info(" glibc getpid(): %llu/s\n", (unsigned long long) (MEASURE_ITERATIONS*USEC_PER_SEC/q));
t = now(CLOCK_MONOTONIC);
for (i = 0; i < MEASURE_ITERATIONS; i++)
(void) getpid_cached();
q = now(CLOCK_MONOTONIC) - t;
log_info("getpid_cached(): %llu/s\n", (unsigned long long) (MEASURE_ITERATIONS*USEC_PER_SEC/q));
}
static void test_safe_fork(void) {
siginfo_t status;
pid_t pid;
int r;
BLOCK_SIGNALS(SIGCHLD);
r = safe_fork("(test-child)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_DEATHSIG|FORK_NULL_STDIO|FORK_REOPEN_LOG, &pid);
assert_se(r >= 0);
if (r == 0) {
/* child */
usleep(100 * USEC_PER_MSEC);
_exit(88);
}
assert_se(wait_for_terminate(pid, &status) >= 0);
assert_se(status.si_code == CLD_EXITED);
assert_se(status.si_status == 88);
}
int main(int argc, char *argv[]) {
log_set_max_level(LOG_DEBUG);
log_parse_environment();
log_open();
saved_argc = argc;
saved_argv = argv;
if (argc > 1) {
pid_t pid = 0;
(void) parse_pid(argv[1], &pid);
test_get_process_comm(pid);
} else {
TEST_REQ_RUNNING_SYSTEMD(test_get_process_comm(1));
test_get_process_comm(getpid());
}
test_pid_is_unwaited();
test_pid_is_alive();
test_personality();
test_get_process_cmdline_harder();
test_rename_process();
test_getpid_cached();
test_getpid_measure();
test_safe_fork();
return 0;
}
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