晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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#!/usr/bin/sh

# Licensed under the GPLv2
#
# Copyright (C) 2011 Politecnico di Torino, Italy
#                    TORSEC group -- http://security.polito.it
# Roberto Sassu <roberto.sassu@polito.it>

MASTERKEYSCONFIG="${NEWROOT}/etc/sysconfig/masterkey"
MULTIKERNELMODE="NO"
PCRLOCKNUM=11

load_masterkey() {
    # read the configuration from the config file
    # shellcheck disable=SC1090
    [ -f "${MASTERKEYSCONFIG}" ] \
        && . "${MASTERKEYSCONFIG}"

    # override the kernel master key path name from the 'masterkey=' parameter
    # in the kernel command line
    MASTERKEYARG=$(getarg masterkey=) && MASTERKEY=${MASTERKEYARG}

    # override the kernel master key type from the 'masterkeytype=' parameter
    # in the kernel command line
    MASTERKEYTYPEARG=$(getarg masterkeytype=) && MASTERKEYTYPE=${MASTERKEYTYPEARG}

    # set default values
    [ -z "${MASTERKEYTYPE}" ] \
        && MASTERKEYTYPE="trusted"

    if [ -z "${MASTERKEY}" ]; then
        # append the kernel version to the default masterkey path name
        # if MULTIKERNELMODE is set to YES
        if [ "${MULTIKERNELMODE}" = "YES" ]; then
            MASTERKEY="/etc/keys/kmk-${MASTERKEYTYPE}-$(uname -r).blob"
        else
            MASTERKEY="/etc/keys/kmk-${MASTERKEYTYPE}.blob"
        fi
    fi

    # set the kernel master key path name
    MASTERKEYPATH="${NEWROOT}${MASTERKEY}"

    # check for kernel master key's existence
    if [ ! -f "${MASTERKEYPATH}" ]; then
        if [ "${RD_DEBUG}" = "yes" ]; then
            info "masterkey: kernel master key file not found: ${MASTERKEYPATH}"
        fi
        return 1
    fi

    # read the kernel master key blob
    KEYBLOB=$(cat "${MASTERKEYPATH}")

    # add the 'load' prefix if the key type is 'trusted'
    [ "${MASTERKEYTYPE}" = "trusted" ] \
        && KEYBLOB="load ${KEYBLOB} pcrlock=${PCRLOCKNUM}"

    # load the kernel master key
    info "Loading the kernel master key"
    keyctl add "${MASTERKEYTYPE}" "kmk-${MASTERKEYTYPE}" "${KEYBLOB}" @u > /dev/null || {
        info "masterkey: failed to load the kernel master key: kmk-${MASTERKEYTYPE}"
        return 1
    }

    return 0
}

load_masterkey