| 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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| 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/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>clfs</emphasis>, a user that
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| 16 | exists only on the host system. Although <filename
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| 17 | class="directory">/tools</filename> and <filename
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| 18 | class="directory">/cross-tools</filename> can be deleted once the CLFS
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| 19 | 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 these directories and all the files
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| 25 | therein, thus exposing those files to possible malicious manipulation.</para>
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| 26 |
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| 27 | <para os="b">One possible fix for this issue might be to add the
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| 28 | <systemitem class="username">clfs</systemitem> user to the new CLFS system
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| 29 | later when creating the <filename>/etc/passwd</filename> file, taking care
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| 30 | to assign it the same user and group IDs as on the host system. Alternatively,
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| 31 | assign the contents of the <filename class="directory">/tools</filename>
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| 32 | and <filename class="directory">/cross-tools</filename> directories to
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| 33 | user <systemitem class="username">root</systemitem> by running the
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| 34 | following commands:</para>
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| 35 |
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| 36 | <screen os="c"><userinput>chown -Rv 0:0 /tools
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| 37 | chown -Rv 0:0 /cross-tools</userinput></screen>
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| 38 |
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| 39 | <para os="d">The commands use <parameter>0:0</parameter> instead of
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| 40 | <parameter>root:root</parameter>, because <command>chown</command>
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| 41 | is unable to resolve the name <quote>root</quote> until the
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| 42 | <filename>passwd</filename> file has been created.</para>
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| 43 |
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| 44 | </sect1>
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