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-boot-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 | directory, <filename class="directory">/cross-tools</filename> directory, and |
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15 | <filename class="directory">$LFS</filename> directory are owned |
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16 | by the user <systemitem class="username">lfs</systemitem>, |
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17 | a user that exists only on the host system. For security reasons, the |
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18 | $LFS root directory and all of it subdirectories should be owned by |
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19 | <systemitem class="username">root</systemitem>. Change the ownership for $LFS and its subdirectories by running these commands:</para> |
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20 | |
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21 | <screen><userinput>chown root:root ${LFS} |
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22 | chown -R root:root $LFS/{bin,boot,dev,etc,home,lib,media,mnt,opt,proc,root,sbin,srv,sys,tmp,usr,var}</userinput></screen> |
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23 | |
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24 | <para os="b">The same issue also exists with <filename class="directory">/tools</filename> and <filename class="directory">/cross-tools</filename>. Although these directories can be deleted once the |
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25 | LFS system has been finished, they can be retained to build additional |
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26 | LFS systems. If the <filename class="directory">/tools</filename> and <filename class="directory">/cross-tools</filename> |
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27 | directories are kept as is, the files are owned by a user ID without a |
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28 | corresponding account. This is dangerous because a user account created |
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29 | later could get this same user ID and would own the <filename |
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30 | class="directory">/tools</filename> and <filename class="directory">/cross-tools</filename> directories and all the files therein, |
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31 | thus exposing these files to possible malicious manipulation.</para> |
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32 | |
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33 | <para os="c">To avoid this issue, add the <systemitem |
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34 | class="username">lfs</systemitem> user to the new LFS system later when |
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35 | creating the <filename>/etc/passwd</filename> file, taking care to assign |
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36 | it the same user and group IDs as on the host system. Alternatively, |
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37 | assign the contents of the <filename class="directory">/tools</filename> |
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38 | and <filename class="directory">/cross-tools</filename> directories to user <systemitem class="username">root</systemitem> by running |
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39 | the following commands:</para> |
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40 | |
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41 | <screen><userinput>chown -R root:root /tools |
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42 | chown -R root:root /cross-tools</userinput></screen> |
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43 | |
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44 | </sect1> |
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