[3f8be484] | 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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[6d4c909] | 13 | <note os="a"> |
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| 14 | <para>From now on, all commands in the rest of the book will be run as the <systemitem class="username">root</systemitem> user.</para> |
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| 15 | </note> |
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| 16 | |
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| 17 | <para os="b">Currently, the <filename class="directory">/tools</filename> |
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| 18 | directory, <filename class="directory">/cross-tools</filename> directory, and |
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| 19 | <filename class="directory">$LFS</filename> directory are owned |
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| 20 | by the user <systemitem class="username">lfs</systemitem>, |
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| 21 | a user that exists only on the host system. For security reasons, the $LFS root directory and all of it subdirectories should be owned by <systemitem class="username">root</systemitem>. Change the ownership for $LFS and its subdirectories by running these commands:</para> |
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| 22 | |
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[fa6e750] | 23 | <screen><userinput>chown root:root ${LFS} |
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| 24 | 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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[6d4c909] | 25 | |
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[e3a1e522] | 26 | <para os="c">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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[6d4c909] | 27 | LFS system has been finished, they can be retained to build additional |
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| 28 | LFS systems. If the <filename class="directory">/tools</filename> and <filename class="directory">/cross-tools</filename> |
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| 29 | directories are kept as is, the files are owned by a user ID without a |
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[3f8be484] | 30 | corresponding account. This is dangerous because a user account created |
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| 31 | later could get this same user ID and would own the <filename |
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[6d4c909] | 32 | class="directory">/tools</filename> and <filename class="directory">/cross-tools</filename> directories and all the files therein, |
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[3f8be484] | 33 | thus exposing these files to possible malicious manipulation.</para> |
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| 34 | |
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[6d4c909] | 35 | <para os="d">To avoid this issue, add the <systemitem |
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[3f8be484] | 36 | class="username">lfs</systemitem> user to the new LFS system later when |
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| 37 | creating the <filename>/etc/passwd</filename> file, taking care to assign |
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| 38 | it the same user and group IDs as on the host system. Alternatively, |
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| 39 | assign the contents of the <filename class="directory">/tools</filename> |
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[6d4c909] | 40 | and <filename class="directory">/cross-tools</filename> directories to user <systemitem class="username">root</systemitem> by running |
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[fa6e750] | 41 | the following commands:</para> |
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[3f8be484] | 42 | |
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[fa6e750] | 43 | <screen><userinput>chown -R root:root /tools |
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| 44 | chown -R root:root /cross-tools</userinput></screen> |
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[6d4c909] | 45 | |
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[fa6e750] | 46 | <para os="e">This book assumes you ran these <command>chown</command> commands.</para> |
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[3f8be484] | 47 | |
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| 48 | </sect1> |
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