1 | <?xml version="1.0" encoding="ISO-8859-1"?> |
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2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" |
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3 | "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [ |
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4 | <!ENTITY % general-entities SYSTEM "../../general.ent"> |
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5 | %general-entities; |
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6 | ]> |
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7 | |
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8 | <sect1 id="ch-chroot-changingowner"> |
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9 | <?dbhtml filename="changingowner.html"?> |
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10 | |
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11 | <title>Changing Ownership</title> |
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12 | |
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13 | <para os="a">Currently, the <filename class="directory">/tools</filename> |
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14 | and <filename class="directory">/cross-tools</filename> directories |
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15 | are owned by the user <emphasis>lfs</emphasis>, a user that |
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16 | exists only on the host system. Although the <filename |
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17 | class="directory">/tools</filename> and <filename |
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18 | class="directory">/cross-tools</filename> directories can be deleted |
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19 | once the CLFS system has been finished, they can be retained to build |
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20 | additional CLFS systems. If the <filename class="directory">/tools</filename> |
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21 | and <filename class="directory">/cross-tools</filename> directories are |
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22 | kept as is, the files are owned by a user ID without a corresponding |
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23 | account. This is dangerous because a user account created later could |
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24 | get this same user ID and would own the <filename |
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25 | class="directory">/tools</filename> directory and all the files therein, |
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26 | thus exposing these files to possible malicious manipulation.</para> |
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27 | |
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28 | <para os="b">To avoid this issue, add the <systemitem |
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29 | class="username">lfs</systemitem> user to the new CLFS system later when |
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30 | creating the <filename>/etc/passwd</filename> file, taking care to assign |
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31 | it the same user and group IDs as on the host system. Alternatively, |
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32 | assign the contents of the <filename class="directory">/tools</filename> |
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33 | and <filename class="directory">/cross-tools</filename> directories to |
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34 | user <systemitem class="username">root</systemitem> by running the |
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35 | following commands:</para> |
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36 | |
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37 | <screen os="c"><userinput>chown -Rv 0:0 /tools |
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38 | chown -Rv 0:0 /cross-tools</userinput></screen> |
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39 | |
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40 | <para os="d">The commands use <parameter>0:0</parameter> instead of |
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41 | <parameter>root:root</parameter>, because <command>chown</command> |
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42 | is unable to resolve the name <quote>root</quote> until the |
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43 | <filename>passwd</filename> file has been created.</para> |
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44 | |
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45 | </sect1> |
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