Ejemplo n.º 1
0
_public_ int sd_pid_get_unit(pid_t pid, char **unit) {

        assert_return(pid >= 0, -EINVAL);
        assert_return(unit, -EINVAL);

        return cg_pid_get_unit(pid, unit);
}
Ejemplo n.º 2
0
_public_ int sd_pid_get_unit(pid_t pid, char **unit) {
        int r;

        assert_return(pid >= 0, -EINVAL);
        assert_return(unit, -EINVAL);

        r = cg_pid_get_unit(pid, unit);
        return IN_SET(r, -ENXIO, -ENOMEDIUM) ? -ENODATA : r;
}
Ejemplo n.º 3
0
_public_ int sd_peer_get_unit(int fd, char **unit) {
        struct ucred ucred;
        int r;

        assert_return(fd >= 0, -EINVAL);
        assert_return(unit, -EINVAL);

        r = getpeercred(fd, &ucred);
        if (r < 0)
                return r;

        return cg_pid_get_unit(ucred.pid, unit);
}
Ejemplo n.º 4
0
static void test_proc(void) {
        _cleanup_closedir_ DIR *d = NULL;
        struct dirent *de;
        int r;

        d = opendir("/proc");
        assert_se(d);

        FOREACH_DIRENT(de, d, break) {
                _cleanup_free_ char *path = NULL, *path_shifted = NULL, *session = NULL, *unit = NULL, *user_unit = NULL, *machine = NULL, *slice = NULL;
                pid_t pid;
                uid_t uid = UID_INVALID;

                if (de->d_type != DT_DIR &&
                    de->d_type != DT_UNKNOWN)
                        continue;

                r = parse_pid(de->d_name, &pid);
                if (r < 0)
                        continue;

                if (is_kernel_thread(pid))
                        continue;

                cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &path);
                cg_pid_get_path_shifted(pid, NULL, &path_shifted);
                cg_pid_get_owner_uid(pid, &uid);
                cg_pid_get_session(pid, &session);
                cg_pid_get_unit(pid, &unit);
                cg_pid_get_user_unit(pid, &user_unit);
                cg_pid_get_machine_name(pid, &machine);
                cg_pid_get_slice(pid, &slice);

                printf(PID_FMT"\t%s\t%s\t"UID_FMT"\t%s\t%s\t%s\t%s\t%s\n",
                       pid,
                       path,
                       path_shifted,
                       uid,
                       session,
                       unit,
                       user_unit,
                       machine,
                       slice);
        }
}
Ejemplo n.º 5
0
int main(int argc, char* argv[]) {
        int r, j = 0;
        _cleanup_free_ char *p = NULL;
        ssize_t n;
        pid_t pid;
        uid_t uid;
        gid_t gid;
        struct iovec iovec[14];
        _cleanup_free_ char *core_pid = NULL, *core_uid = NULL, *core_gid = NULL, *core_signal = NULL,
                *core_timestamp = NULL, *core_comm = NULL, *core_exe = NULL, *core_unit = NULL,
                *core_session = NULL, *core_message = NULL, *core_cmdline = NULL, *t = NULL;

        prctl(PR_SET_DUMPABLE, 0);

        if (argc != _ARG_MAX) {
                log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
                log_open();

                log_error("Invalid number of arguments passed from kernel.");
                r = -EINVAL;
                goto finish;
        }

        r = parse_pid(argv[ARG_PID], &pid);
        if (r < 0) {
                log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
                log_open();

                log_error("Failed to parse PID.");
                goto finish;
        }

        if (cg_pid_get_unit(pid, &t) >= 0) {

                if (streq(t, SPECIAL_JOURNALD_SERVICE)) {
                        /* Make sure we don't make use of the journal,
                         * if it's the journal which is crashing */
                        log_set_target(LOG_TARGET_KMSG);
                        log_open();

                        r = divert_coredump();
                        goto finish;
                }

                core_unit = strappend("COREDUMP_UNIT=", t);
        } else if (cg_pid_get_user_unit(pid, &t) >= 0)
                core_unit = strappend("COREDUMP_USER_UNIT=", t);

        if (core_unit)
                IOVEC_SET_STRING(iovec[j++], core_unit);

        /* OK, now we know it's not the journal, hence make use of
         * it */
        log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
        log_open();

        r = parse_uid(argv[ARG_UID], &uid);
        if (r < 0) {
                log_error("Failed to parse UID.");
                goto finish;
        }

        r = parse_gid(argv[ARG_GID], &gid);
        if (r < 0) {
                log_error("Failed to parse GID.");
                goto finish;
        }

        core_pid = strappend("COREDUMP_PID=", argv[ARG_PID]);
        if (core_pid)
                IOVEC_SET_STRING(iovec[j++], core_pid);

        core_uid = strappend("COREDUMP_UID=", argv[ARG_UID]);
        if (core_uid)
                IOVEC_SET_STRING(iovec[j++], core_uid);

        core_gid = strappend("COREDUMP_GID=", argv[ARG_GID]);
        if (core_gid)
                IOVEC_SET_STRING(iovec[j++], core_gid);

        core_signal = strappend("COREDUMP_SIGNAL=", argv[ARG_SIGNAL]);
        if (core_signal)
                IOVEC_SET_STRING(iovec[j++], core_signal);

        core_comm = strappend("COREDUMP_COMM=", argv[ARG_COMM]);
        if (core_comm)
                IOVEC_SET_STRING(iovec[j++], core_comm);

#ifdef HAVE_LOGIND
        if (sd_pid_get_session(pid, &t) >= 0) {
                core_session = strappend("COREDUMP_SESSION=", t);
                free(t);

                if (core_session)
                        IOVEC_SET_STRING(iovec[j++], core_session);
        }

#endif

        if (get_process_exe(pid, &t) >= 0) {
                core_exe = strappend("COREDUMP_EXE=", t);
                free(t);

                if (core_exe)
                        IOVEC_SET_STRING(iovec[j++], core_exe);
        }

        if (get_process_cmdline(pid, 0, false, &t) >= 0) {
                core_cmdline = strappend("COREDUMP_CMDLINE=", t);
                free(t);

                if (core_cmdline)
                        IOVEC_SET_STRING(iovec[j++], core_cmdline);
        }

        core_timestamp = strjoin("COREDUMP_TIMESTAMP=", argv[ARG_TIMESTAMP], "000000", NULL);
        if (core_timestamp)
                IOVEC_SET_STRING(iovec[j++], core_timestamp);

        IOVEC_SET_STRING(iovec[j++], "MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1");
        IOVEC_SET_STRING(iovec[j++], "PRIORITY=2");

        core_message = strjoin("MESSAGE=Process ", argv[ARG_PID], " (", argv[ARG_COMM], ") dumped core.", NULL);
        if (core_message)
                IOVEC_SET_STRING(iovec[j++], core_message);

        /* Now, let's drop privileges to become the user who owns the
         * segfaulted process and allocate the coredump memory under
         * his uid. This also ensures that the credentials journald
         * will see are the ones of the coredumping user, thus making
         * sure the user himself gets access to the core dump. */

        if (setresgid(gid, gid, gid) < 0 ||
            setresuid(uid, uid, uid) < 0) {
                log_error("Failed to drop privileges: %m");
                r = -errno;
                goto finish;
        }

        p = malloc(9 + COREDUMP_MAX);
        if (!p) {
                r = log_oom();
                goto finish;
        }

        memcpy(p, "COREDUMP=", 9);

        n = loop_read(STDIN_FILENO, p + 9, COREDUMP_MAX, false);
        if (n < 0) {
                log_error("Failed to read core dump data: %s", strerror(-n));
                r = (int) n;
                goto finish;
        }

        iovec[j].iov_base = p;
        iovec[j].iov_len = 9 + n;
        j++;

        r = sd_journal_sendv(iovec, j);
        if (r < 0)
                log_error("Failed to send coredump: %s", strerror(-r));

finish:
        return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
Ejemplo n.º 6
0
int main(int argc, char* argv[]) {

        /* The small core field we allocate on the stack, to keep things simple */
        char
                *core_pid = NULL, *core_uid = NULL, *core_gid = NULL, *core_signal = NULL,
                *core_session = NULL, *core_exe = NULL, *core_comm = NULL, *core_cmdline = NULL,
                *core_cgroup = NULL, *core_cwd = NULL, *core_root = NULL, *core_unit = NULL,
                *core_slice = NULL;

        /* The larger ones we allocate on the heap */
        _cleanup_free_ char
                *core_timestamp = NULL,  *core_message = NULL, *coredump_data = NULL, *core_owner_uid = NULL,
                *core_open_fds = NULL, *core_proc_status = NULL, *core_proc_maps = NULL, *core_proc_limits = NULL,
                *core_proc_cgroup = NULL, *core_environ = NULL;

        _cleanup_free_ char *exe = NULL, *comm = NULL, *filename = NULL;
        const char *info[_INFO_LEN];

        _cleanup_close_ int coredump_fd = -1;

        struct iovec iovec[26];
        uint64_t coredump_size;
        int r, j = 0;
        uid_t uid, owner_uid;
        gid_t gid;
        pid_t pid;
        char *t;
        const char *p;

        /* Make sure we never enter a loop */
        prctl(PR_SET_DUMPABLE, 0);

        /* First, log to a safe place, since we don't know what
         * crashed and it might be journald which we'd rather not log
         * to then. */
        log_set_target(LOG_TARGET_KMSG);
        log_open();

        if (argc < INFO_COMM + 1) {
                log_error("Not enough arguments passed from kernel (%d, expected %d).",
                          argc - 1, INFO_COMM + 1 - 1);
                r = -EINVAL;
                goto finish;
        }

        /* Ignore all parse errors */
        parse_config();

        log_debug("Selected storage '%s'.", coredump_storage_to_string(arg_storage));
        log_debug("Selected compression %s.", yes_no(arg_compress));

        r = parse_uid(argv[INFO_UID + 1], &uid);
        if (r < 0) {
                log_error("Failed to parse UID.");
                goto finish;
        }

        r = parse_pid(argv[INFO_PID + 1], &pid);
        if (r < 0) {
                log_error("Failed to parse PID.");
                goto finish;
        }

        r = parse_gid(argv[INFO_GID + 1], &gid);
        if (r < 0) {
                log_error("Failed to parse GID.");
                goto finish;
        }

        if (get_process_comm(pid, &comm) < 0) {
                log_warning("Failed to get COMM, falling back to the command line.");
                comm = strv_join(argv + INFO_COMM + 1, " ");
        }

        if (get_process_exe(pid, &exe) < 0)
                log_warning("Failed to get EXE.");

        info[INFO_PID] = argv[INFO_PID + 1];
        info[INFO_UID] = argv[INFO_UID + 1];
        info[INFO_GID] = argv[INFO_GID + 1];
        info[INFO_SIGNAL] = argv[INFO_SIGNAL + 1];
        info[INFO_TIMESTAMP] = argv[INFO_TIMESTAMP + 1];
        info[INFO_COMM] = comm;
        info[INFO_EXE] = exe;

        if (cg_pid_get_unit(pid, &t) >= 0) {

                if (streq(t, SPECIAL_JOURNALD_SERVICE)) {
                        free(t);

                        /* If we are journald, we cut things short,
                         * don't write to the journal, but still
                         * create a coredump. */

                        if (arg_storage != COREDUMP_STORAGE_NONE)
                                arg_storage = COREDUMP_STORAGE_EXTERNAL;

                        r = save_external_coredump(info, uid, &filename, &coredump_fd, &coredump_size);
                        if (r < 0)
                                goto finish;

                        r = maybe_remove_external_coredump(filename, coredump_size);
                        if (r < 0)
                                goto finish;

                        log_info("Detected coredump of the journal daemon itself, diverted to %s.", filename);
                        goto finish;
                }

                core_unit = strjoina("COREDUMP_UNIT=", t);
                free(t);

        } else if (cg_pid_get_user_unit(pid, &t) >= 0) {
                core_unit = strjoina("COREDUMP_USER_UNIT=", t);
                free(t);
        }

        if (core_unit)
                IOVEC_SET_STRING(iovec[j++], core_unit);

        /* OK, now we know it's not the journal, hence we can make use
         * of it now. */
        log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
        log_open();

        core_pid = strjoina("COREDUMP_PID=", info[INFO_PID]);
        IOVEC_SET_STRING(iovec[j++], core_pid);

        core_uid = strjoina("COREDUMP_UID=", info[INFO_UID]);
        IOVEC_SET_STRING(iovec[j++], core_uid);

        core_gid = strjoina("COREDUMP_GID=", info[INFO_GID]);
        IOVEC_SET_STRING(iovec[j++], core_gid);

        core_signal = strjoina("COREDUMP_SIGNAL=", info[INFO_SIGNAL]);
        IOVEC_SET_STRING(iovec[j++], core_signal);

        if (sd_pid_get_session(pid, &t) >= 0) {
                core_session = strjoina("COREDUMP_SESSION=", t);
                free(t);

                IOVEC_SET_STRING(iovec[j++], core_session);
        }

        if (sd_pid_get_owner_uid(pid, &owner_uid) >= 0) {
                r = asprintf(&core_owner_uid,
                             "COREDUMP_OWNER_UID=" UID_FMT, owner_uid);
                if (r > 0)
                        IOVEC_SET_STRING(iovec[j++], core_owner_uid);
        }

        if (sd_pid_get_slice(pid, &t) >= 0) {
                core_slice = strjoina("COREDUMP_SLICE=", t);
                free(t);

                IOVEC_SET_STRING(iovec[j++], core_slice);
        }

        if (comm) {
                core_comm = strjoina("COREDUMP_COMM=", comm);
                IOVEC_SET_STRING(iovec[j++], core_comm);
        }

        if (exe) {
                core_exe = strjoina("COREDUMP_EXE=", exe);
                IOVEC_SET_STRING(iovec[j++], core_exe);
        }

        if (get_process_cmdline(pid, 0, false, &t) >= 0) {
                core_cmdline = strjoina("COREDUMP_CMDLINE=", t);
                free(t);

                IOVEC_SET_STRING(iovec[j++], core_cmdline);
        }

        if (cg_pid_get_path_shifted(pid, NULL, &t) >= 0) {
                core_cgroup = strjoina("COREDUMP_CGROUP=", t);
                free(t);

                IOVEC_SET_STRING(iovec[j++], core_cgroup);
        }

        if (compose_open_fds(pid, &t) >= 0) {
                core_open_fds = strappend("COREDUMP_OPEN_FDS=", t);
                free(t);

                if (core_open_fds)
                        IOVEC_SET_STRING(iovec[j++], core_open_fds);
        }

        p = procfs_file_alloca(pid, "status");
        if (read_full_file(p, &t, NULL) >= 0) {
                core_proc_status = strappend("COREDUMP_PROC_STATUS=", t);
                free(t);

                if (core_proc_status)
                        IOVEC_SET_STRING(iovec[j++], core_proc_status);
        }

        p = procfs_file_alloca(pid, "maps");
        if (read_full_file(p, &t, NULL) >= 0) {
                core_proc_maps = strappend("COREDUMP_PROC_MAPS=", t);
                free(t);

                if (core_proc_maps)
                        IOVEC_SET_STRING(iovec[j++], core_proc_maps);
        }

        p = procfs_file_alloca(pid, "limits");
        if (read_full_file(p, &t, NULL) >= 0) {
                core_proc_limits = strappend("COREDUMP_PROC_LIMITS=", t);
                free(t);

                if (core_proc_limits)
                        IOVEC_SET_STRING(iovec[j++], core_proc_limits);
        }

        p = procfs_file_alloca(pid, "cgroup");
        if (read_full_file(p, &t, NULL) >=0) {
                core_proc_cgroup = strappend("COREDUMP_PROC_CGROUP=", t);
                free(t);

                if (core_proc_cgroup)
                        IOVEC_SET_STRING(iovec[j++], core_proc_cgroup);
        }

        if (get_process_cwd(pid, &t) >= 0) {
                core_cwd = strjoina("COREDUMP_CWD=", t);
                free(t);

                IOVEC_SET_STRING(iovec[j++], core_cwd);
        }

        if (get_process_root(pid, &t) >= 0) {
                core_root = strjoina("COREDUMP_ROOT=", t);
                free(t);

                IOVEC_SET_STRING(iovec[j++], core_root);
        }

        if (get_process_environ(pid, &t) >= 0) {
                core_environ = strappend("COREDUMP_ENVIRON=", t);
                free(t);

                if (core_environ)
                        IOVEC_SET_STRING(iovec[j++], core_environ);
        }

        core_timestamp = strjoin("COREDUMP_TIMESTAMP=", info[INFO_TIMESTAMP], "000000", NULL);
        if (core_timestamp)
                IOVEC_SET_STRING(iovec[j++], core_timestamp);

        IOVEC_SET_STRING(iovec[j++], "MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1");
        IOVEC_SET_STRING(iovec[j++], "PRIORITY=2");

        /* Vacuum before we write anything again */
        coredump_vacuum(-1, arg_keep_free, arg_max_use);

        /* Always stream the coredump to disk, if that's possible */
        r = save_external_coredump(info, uid, &filename, &coredump_fd, &coredump_size);
        if (r < 0)
                /* skip whole core dumping part */
                goto log;

        /* If we don't want to keep the coredump on disk, remove it
         * now, as later on we will lack the privileges for
         * it. However, we keep the fd to it, so that we can still
         * process it and log it. */
        r = maybe_remove_external_coredump(filename, coredump_size);
        if (r < 0)
                goto finish;
        if (r == 0) {
                const char *coredump_filename;

                coredump_filename = strjoina("COREDUMP_FILENAME=", filename);
                IOVEC_SET_STRING(iovec[j++], coredump_filename);
        }

        /* Vacuum again, but exclude the coredump we just created */
        coredump_vacuum(coredump_fd, arg_keep_free, arg_max_use);

        /* Now, let's drop privileges to become the user who owns the
         * segfaulted process and allocate the coredump memory under
         * the user's uid. This also ensures that the credentials
         * journald will see are the ones of the coredumping user,
         * thus making sure the user gets access to the core
         * dump. Let's also get rid of all capabilities, if we run as
         * root, we won't need them anymore. */
        r = drop_privileges(uid, gid, 0);
        if (r < 0) {
                log_error_errno(r, "Failed to drop privileges: %m");
                goto finish;
        }

#ifdef HAVE_ELFUTILS
        /* Try to get a strack trace if we can */
        if (coredump_size <= arg_process_size_max) {
                _cleanup_free_ char *stacktrace = NULL;

                r = coredump_make_stack_trace(coredump_fd, exe, &stacktrace);
                if (r >= 0)
                        core_message = strjoin("MESSAGE=Process ", info[INFO_PID], " (", comm, ") of user ", info[INFO_UID], " dumped core.\n\n", stacktrace, NULL);
                else if (r == -EINVAL)
                        log_warning("Failed to generate stack trace: %s", dwfl_errmsg(dwfl_errno()));
                else
                        log_warning_errno(r, "Failed to generate stack trace: %m");
        }

        if (!core_message)
#endif
log:
        core_message = strjoin("MESSAGE=Process ", info[INFO_PID], " (", comm, ") of user ", info[INFO_UID], " dumped core.", NULL);
        if (core_message)
                IOVEC_SET_STRING(iovec[j++], core_message);

        /* Optionally store the entire coredump in the journal */
        if (IN_SET(arg_storage, COREDUMP_STORAGE_JOURNAL, COREDUMP_STORAGE_BOTH) &&
            coredump_size <= arg_journal_size_max) {
                size_t sz = 0;

                /* Store the coredump itself in the journal */

                r = allocate_journal_field(coredump_fd, (size_t) coredump_size, &coredump_data, &sz);
                if (r >= 0) {
                        iovec[j].iov_base = coredump_data;
                        iovec[j].iov_len = sz;
                        j++;
                }
        }

        r = sd_journal_sendv(iovec, j);
        if (r < 0)
                log_error_errno(r, "Failed to log coredump: %m");

finish:
        return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}