Adding upstream version 247.3.upstream/247.3upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 720 insertions, 0 deletions

diff --git a/src/test/test-process-util.c b/src/test/test-process-util.c
new file mode 100644
index 0000000..a87cdf8
--- /dev/null
+++ b/src/test/test-process-util.c
@@ -0,0 +1,720 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <fcntl.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 "errno-util.h"
+#include "fd-util.h"
+#include "log.h"
+#include "macro.h"
+#include "missing_sched.h"
+#include "missing_syscall.h"
+#include "parse-util.h"
+#include "process-util.h"
+#include "rlimit-util.h"
+#include "signal-util.h"
+#include "stdio-util.h"
+#include "string-util.h"
+#include "terminal-util.h"
+#include "tests.h"
+#include "user-util.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, PROCESS_CMDLINE_COMM_FALLBACK, &c) >= 0);
+        log_info("PID"PID_FMT" cmdline: '%s'", pid, c);
+
+        assert_se(get_process_cmdline(pid, 8, 0, &d) >= 0);
+        log_info("PID"PID_FMT" cmdline truncated to 8: '%s'", pid, d);
+
+        free(d);
+        assert_se(get_process_cmdline(pid, 1, 0, &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(get_process_gid(pid, &g) == 0);
+        log_info("PID"PID_FMT" GID: "GID_FMT, pid, g);
+
+        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);
+
+        (void) getenv_for_pid(pid, "PATH", &i);
+        log_info("PID"PID_FMT" $PATH: '%s'", pid, strna(i));
+}
+
+static void test_get_process_comm_escape_one(const char *input, const char *output) {
+        _cleanup_free_ char *n = NULL;
+
+        log_info("input: <%s> — output: <%s>", input, output);
+
+        assert_se(prctl(PR_SET_NAME, input) >= 0);
+        assert_se(get_process_comm(0, &n) >= 0);
+
+        log_info("got: <%s>", n);
+
+        assert_se(streq_ptr(n, output));
+}
+
+static void test_get_process_comm_escape(void) {
+        _cleanup_free_ char *saved = NULL;
+
+        assert_se(get_process_comm(0, &saved) >= 0);
+
+        test_get_process_comm_escape_one("", "");
+        test_get_process_comm_escape_one("foo", "foo");
+        test_get_process_comm_escape_one("012345678901234", "012345678901234");
+        test_get_process_comm_escape_one("0123456789012345", "012345678901234");
+        test_get_process_comm_escape_one("äöüß", "\\303\\244\\303\\266\\303\\274\\303\\237");
+        test_get_process_comm_escape_one("xäöüß", "x\\303\\244\\303\\266\\303\\274\\303\\237");
+        test_get_process_comm_escape_one("xxäöüß", "xx\\303\\244\\303\\266\\303\\274\\303\\237");
+        test_get_process_comm_escape_one("xxxäöüß", "xxx\\303\\244\\303\\266\\303\\274\\303\\237");
+        test_get_process_comm_escape_one("xxxxäöüß", "xxxx\\303\\244\\303\\266\\303\\274\\303\\237");
+        test_get_process_comm_escape_one("xxxxxäöüß", "xxxxx\\303\\244\\303\\266\\303\\274\\303\\237");
+
+        assert_se(prctl(PR_SET_NAME, saved) >= 0);
+}
+
+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) {
+                log_info("Skipping %s: not root", __func__);
+                return;
+        }
+
+        if (!have_namespaces()) {
+                log_notice("Testing without namespaces, skipping %s", __func__);
+                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) {
+                log_info("Skipping %s: running on valgrind", __func__);
+                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);
+
+        if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL) < 0) {
+                log_warning_errno(errno, "mount(..., \"/\", MS_SLAVE|MS_REC, ...) failed: %m");
+                assert_se(IN_SET(errno, EPERM, EACCES));
+                return;
+        }
+
+        fd = mkostemp(path, O_CLOEXEC);
+        assert_se(fd >= 0);
+
+        /* Note that we don't unmount the following bind-mount at the end of the test because the kernel
+         * will clear up its /proc/PID/ hierarchy automatically as soon as the test stops. */
+        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_se(IN_SET(errno, EPERM, EACCES));
+                return;
+        }
+
+        assert_se(unlink(path) >= 0);
+
+        assert_se(prctl(PR_SET_NAME, "testa") >= 0);
+
+        assert_se(get_process_cmdline(getpid_cached(), SIZE_MAX, 0, &line) == -ENOENT);
+
+        assert_se(get_process_cmdline(getpid_cached(), SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        assert_se(streq(line, "[testa]"));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), 0, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        log_info("'%s'", line);
+        assert_se(streq(line, ""));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), 1, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        assert_se(streq(line, "…"));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), 2, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        assert_se(streq(line, "[…"));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), 3, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        assert_se(streq(line, "[t…"));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), 4, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        assert_se(streq(line, "[te…"));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), 5, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        assert_se(streq(line, "[tes…"));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), 6, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        assert_se(streq(line, "[test…"));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), 7, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        assert_se(streq(line, "[testa]"));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), 8, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        assert_se(streq(line, "[testa]"));
+        line = mfree(line);
+
+        assert_se(write(fd, "foo\0bar", 8) == 8);
+
+        assert_se(get_process_cmdline(getpid_cached(), SIZE_MAX, 0, &line) >= 0);
+        log_info("'%s'", line);
+        assert_se(streq(line, "foo bar"));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &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(), SIZE_MAX, 0, &line) >= 0);
+        log_info("'%s'", line);
+        assert_se(streq(line, "foo bar quux"));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        assert_se(streq(line, "foo bar quux"));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), 1, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        assert_se(streq(line, "…"));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), 2, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        assert_se(streq(line, "f…"));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), 3, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        assert_se(streq(line, "fo…"));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), 4, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        assert_se(streq(line, "foo…"));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), 5, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        assert_se(streq(line, "foo …"));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), 6, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        assert_se(streq(line, "foo b…"));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), 7, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        assert_se(streq(line, "foo ba…"));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), 8, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        assert_se(streq(line, "foo bar…"));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), 9, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        assert_se(streq(line, "foo bar …"));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), 10, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        assert_se(streq(line, "foo bar q…"));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), 11, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        assert_se(streq(line, "foo bar qu…"));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), 12, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        assert_se(streq(line, "foo bar quux"));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), 13, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        assert_se(streq(line, "foo bar quux"));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), 14, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        assert_se(streq(line, "foo bar quux"));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), 1000, PROCESS_CMDLINE_COMM_FALLBACK, &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(), SIZE_MAX, 0, &line) == -ENOENT);
+
+        assert_se(get_process_cmdline(getpid_cached(), SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        assert_se(streq(line, "[aaaa bbbb cccc]"));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), 10, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        assert_se(streq(line, "[aaaa bbb…"));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), 11, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        assert_se(streq(line, "[aaaa bbbb…"));
+        line = mfree(line);
+
+        assert_se(get_process_cmdline(getpid_cached(), 12, PROCESS_CMDLINE_COMM_FALLBACK, &line) >= 0);
+        assert_se(streq(line, "[aaaa bbbb …"));
+        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, TASK_COMM_LEN-1));
+        /* We expect comm to be at most 16 bytes (TASK_COMM_LEN). The kernel may raise this limit in the
+         * future. We'd only check the initial part, at least until we recompile, but this will still pass. */
+
+        r = get_process_cmdline(0, SIZE_MAX, 0, &cmdline);
+        assert_se(r >= 0);
+        /* we cannot expect cmdline to be renamed properly without privileges */
+        if (geteuid() == 0) {
+                if (r == 0 && detect_container() > 0)
+                        log_info("cmdline = <%s> (not verified, Running in unprivileged container?)", cmdline);
+                else {
+                        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(): %lf µs each\n", (double) q / MEASURE_ITERATIONS);
+
+        t = now(CLOCK_MONOTONIC);
+        for (i = 0; i < MEASURE_ITERATIONS; i++)
+                (void) getpid_cached();
+        q = now(CLOCK_MONOTONIC) - t;
+
+        log_info("getpid_cached(): %lf µs each\n", (double) q / MEASURE_ITERATIONS);
+}
+
+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);
+}
+
+static void test_pid_to_ptr(void) {
+
+        assert_se(PTR_TO_PID(NULL) == 0);
+        assert_se(PID_TO_PTR(0) == NULL);
+
+        assert_se(PTR_TO_PID(PID_TO_PTR(1)) == 1);
+        assert_se(PTR_TO_PID(PID_TO_PTR(2)) == 2);
+        assert_se(PTR_TO_PID(PID_TO_PTR(-1)) == -1);
+        assert_se(PTR_TO_PID(PID_TO_PTR(-2)) == -2);
+
+        assert_se(PTR_TO_PID(PID_TO_PTR(INT16_MAX)) == INT16_MAX);
+        assert_se(PTR_TO_PID(PID_TO_PTR(INT16_MIN)) == INT16_MIN);
+
+        assert_se(PTR_TO_PID(PID_TO_PTR(INT32_MAX)) == INT32_MAX);
+        assert_se(PTR_TO_PID(PID_TO_PTR(INT32_MIN)) == INT32_MIN);
+}
+
+static void test_ioprio_class_from_to_string_one(const char *val, int expected) {
+        assert_se(ioprio_class_from_string(val) == expected);
+        if (expected >= 0) {
+                _cleanup_free_ char *s = NULL;
+                unsigned ret;
+
+                assert_se(ioprio_class_to_string_alloc(expected, &s) == 0);
+                /* We sometimes get a class number and sometimes a number back */
+                assert_se(streq(s, val) ||
+                          safe_atou(val, &ret) == 0);
+        }
+}
+
+static void test_ioprio_class_from_to_string(void) {
+        test_ioprio_class_from_to_string_one("none", IOPRIO_CLASS_NONE);
+        test_ioprio_class_from_to_string_one("realtime", IOPRIO_CLASS_RT);
+        test_ioprio_class_from_to_string_one("best-effort", IOPRIO_CLASS_BE);
+        test_ioprio_class_from_to_string_one("idle", IOPRIO_CLASS_IDLE);
+        test_ioprio_class_from_to_string_one("0", 0);
+        test_ioprio_class_from_to_string_one("1", 1);
+        test_ioprio_class_from_to_string_one("7", 7);
+        test_ioprio_class_from_to_string_one("8", 8);
+        test_ioprio_class_from_to_string_one("9", -1);
+        test_ioprio_class_from_to_string_one("-1", -1);
+}
+
+static void test_setpriority_closest(void) {
+        int r;
+
+        r = safe_fork("(test-setprio)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_DEATHSIG|FORK_WAIT|FORK_LOG, NULL);
+        assert_se(r >= 0);
+
+        if (r == 0) {
+                bool full_test;
+                int p, q;
+                /* child */
+
+                /* rlimit of 30 equals nice level of -10 */
+                if (setrlimit(RLIMIT_NICE, &RLIMIT_MAKE_CONST(30)) < 0) {
+                        /* If this fails we are probably unprivileged or in a userns of some kind, let's skip
+                         * the full test */
+                        assert_se(ERRNO_IS_PRIVILEGE(errno));
+                        full_test = false;
+                } else {
+                        assert_se(setresgid(GID_NOBODY, GID_NOBODY, GID_NOBODY) >= 0);
+                        assert_se(setresuid(UID_NOBODY, UID_NOBODY, UID_NOBODY) >= 0);
+                        full_test = true;
+                }
+
+                errno = 0;
+                p = getpriority(PRIO_PROCESS, 0);
+                assert_se(errno == 0);
+
+                /* It should always be possible to set our nice level to the current one */
+                assert_se(setpriority_closest(p) > 0);
+
+                errno = 0;
+                q = getpriority(PRIO_PROCESS, 0);
+                assert_se(errno == 0 && p == q);
+
+                /* It should also be possible to set the nice level to one higher */
+                if (p < PRIO_MAX-1) {
+                        assert_se(setpriority_closest(++p) > 0);
+
+                        errno = 0;
+                        q = getpriority(PRIO_PROCESS, 0);
+                        assert_se(errno == 0 && p == q);
+                }
+
+                /* It should also be possible to set the nice level to two higher */
+                if (p < PRIO_MAX-1) {
+                        assert_se(setpriority_closest(++p) > 0);
+
+                        errno = 0;
+                        q = getpriority(PRIO_PROCESS, 0);
+                        assert_se(errno == 0 && p == q);
+                }
+
+                if (full_test) {
+                        /* These two should work, given the RLIMIT_NICE we set above */
+                        assert_se(setpriority_closest(-10) > 0);
+                        errno = 0;
+                        q = getpriority(PRIO_PROCESS, 0);
+                        assert_se(errno == 0 && q == -10);
+
+                        assert_se(setpriority_closest(-9) > 0);
+                        errno = 0;
+                        q = getpriority(PRIO_PROCESS, 0);
+                        assert_se(errno == 0 && q == -9);
+
+                        /* This should succeed but should be clamped to the limit */
+                        assert_se(setpriority_closest(-11) == 0);
+                        errno = 0;
+                        q = getpriority(PRIO_PROCESS, 0);
+                        assert_se(errno == 0 && q == -10);
+
+                        assert_se(setpriority_closest(-8) > 0);
+                        errno = 0;
+                        q = getpriority(PRIO_PROCESS, 0);
+                        assert_se(errno == 0 && q == -8);
+
+                        /* This should succeed but should be clamped to the limit */
+                        assert_se(setpriority_closest(-12) == 0);
+                        errno = 0;
+                        q = getpriority(PRIO_PROCESS, 0);
+                        assert_se(errno == 0 && q == -10);
+                }
+
+                _exit(EXIT_SUCCESS);
+        }
+}
+
+int main(int argc, char *argv[]) {
+        test_setup_logging(LOG_DEBUG);
+
+        save_argc_argv(argc, 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_get_process_comm_escape();
+        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();
+        test_pid_to_ptr();
+        test_ioprio_class_from_to_string();
+        test_setpriority_closest();
+
+        return 0;
+}