[673b0d8] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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| 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
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| 3 | <!ENTITY % general-entities SYSTEM "../general.ent">
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| 4 | %general-entities;
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| 5 | ]>
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[752f4e5] | 6 | <sect1 id="ch-system-zlib" role="wrap">
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[673b0d8] | 7 | <title>Zlib-&zlib-version;</title>
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| 8 | <?dbhtml filename="zlib.html"?>
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[24380c7] | 9 |
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[673b0d8] | 10 | <indexterm zone="ch-system-zlib"><primary sortas="a-Zlib">Zlib</primary></indexterm>
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| 11 |
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[a001133] | 12 | <sect2 role="package"><title/>
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[673b0d8] | 13 | <para>The Zlib package contains compression and un-compression routines used by
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[5888299] | 14 | some programs.</para>
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| 15 |
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[a001133] | 16 | <segmentedlist>
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| 17 | <segtitle>&buildtime;</segtitle>
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| 18 | <segtitle>&diskspace;</segtitle>
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| 19 | <seglistitem><seg>0.1 SBU</seg><seg>1.5 MB</seg></seglistitem>
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| 20 | </segmentedlist>
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[673b0d8] | 21 |
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[a001133] | 22 | <segmentedlist>
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| 23 | <segtitle>Zlib installation depends on</segtitle>
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[69993f4] | 24 | <seglistitem><seg>Binutils, Coreutils, GCC, Glibc, Make, and Sed</seg></seglistitem>
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[a001133] | 25 | </segmentedlist>
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| 26 | </sect2>
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[24380c7] | 27 |
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[a001133] | 28 | <sect2 role="installation">
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[73aedd1d] | 29 | <title>Installation of Zlib</title>
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| 30 |
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[343c80b] | 31 | <para>The following patch fixes a Denial of Service vulnerability in
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| 32 | the Zlib compression library:</para>
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[f54c6c0] | 33 |
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| 34 | <screen><userinput>patch -Np1 -i ../zlib-&zlib-version;-security-1.patch</userinput></screen>
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| 35 |
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[ef13657] | 36 | <note><para>Zlib is known to build its shared library incorrectly if
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[752f4e5] | 37 | <envar>CFLAGS</envar> is specified in the environment. If using a
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| 38 | specified <envar>CFLAGS</envar>
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[ef13657] | 39 | variable, be sure to add the <parameter>-fPIC</parameter> directive to
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[752f4e5] | 40 | the <envar>CFLAGS</envar> variable for the duration of the
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[ef13657] | 41 | configure command below, then remove it afterwards.</para></note>
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[73aedd1d] | 42 |
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[4248b0e] | 43 | <para>Prepare Zlib for compilation:</para>
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| 44 |
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| 45 | <screen><userinput>./configure --prefix=/usr --shared</userinput></screen>
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| 46 |
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[73aedd1d] | 47 | <para>Compile the package:</para>
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| 48 |
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| 49 | <screen><userinput>make</userinput></screen>
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| 50 |
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[673b0d8] | 51 | <para>To test the results, issue:
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[8a5f906] | 52 | <userinput>make check</userinput>.</para>
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[dfddb12] | 53 |
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| 54 | <para>Install the shared library:</para>
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[73aedd1d] | 55 |
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| 56 | <screen><userinput>make install</userinput></screen>
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| 57 |
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[2256873] | 58 | <beginpage/>
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| 59 |
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[ef13657] | 60 | <para>Build the static library:</para>
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[8ad7980] | 61 |
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[73aedd1d] | 62 | <screen><userinput>make clean
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| 63 | ./configure --prefix=/usr
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| 64 | make</userinput></screen>
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| 65 |
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[ef13657] | 66 | <para>To test the results again, issue:
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[8a5f906] | 67 | <userinput>make check</userinput>.</para>
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[73aedd1d] | 68 |
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[84e4cae] | 69 | <para>Install the static library:</para>
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[73aedd1d] | 70 |
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| 71 | <screen><userinput>make install</userinput></screen>
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| 72 |
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[ef13657] | 73 | <para>Fix the permissions on the static library:</para>
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[84e4cae] | 74 |
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| 75 | <screen><userinput>chmod 644 /usr/lib/libz.a</userinput></screen>
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| 76 |
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[ef13657] | 77 | <para>It is good policy and common practice to place important
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| 78 | libraries into the <filename class="directory">/lib</filename>
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| 79 | directory. This is most important in scenarios where <filename
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| 80 | class="directory">/usr</filename> is on a separate partition.
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| 81 | Essentially, the run-time components of any libraries that are used by
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| 82 | programs in <filename class="directory">/bin</filename> or <filename
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| 83 | class="directory">/sbin</filename> should reside in <filename
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| 84 | class="directory">/lib</filename> so that they are on the root
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| 85 | partition and available in the event of <filename
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| 86 | class="directory">/usr</filename> being inaccessible.</para>
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| 87 |
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| 88 | <para>For the above reason, move the run-time components of the shared Zlib
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[db9d773c] | 89 | into <filename class="directory">/lib</filename>:</para>
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[73aedd1d] | 90 |
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| 91 | <screen><userinput>mv /usr/lib/libz.so.* /lib</userinput></screen>
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| 92 |
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[69993f4] | 93 | <para>Fix the <filename class="symlink">/usr/lib/libz.so</filename>
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| 94 | symlink:</para>
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[73aedd1d] | 95 |
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| 96 | <screen><userinput>ln -sf ../../lib/libz.so.1 /usr/lib/libz.so</userinput></screen>
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| 97 |
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| 98 | </sect2>
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[24380c7] | 99 |
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[5888299] | 100 |
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[c6cb3aa] | 101 | <sect2 id="contents-zlib" role="content"><title>Contents of Zlib</title>
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[673b0d8] | 102 |
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[c6cb3aa] | 103 | <segmentedlist>
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| 104 | <segtitle>Installed libraries</segtitle>
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| 105 | <seglistitem><seg>libz[a,so]</seg></seglistitem>
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| 106 | </segmentedlist>
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[24380c7] | 107 |
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[2256873] | 108 | <variablelist><bridgehead renderas="sect3">Short Descriptions</bridgehead>
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[3ed279f] | 109 | <?dbfo list-presentation="list"?>
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[673b0d8] | 110 |
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[b8a819f] | 111 | <varlistentry id="libz">
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[2256873] | 112 | <term><filename class="libraryfile">libz</filename></term>
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[c6cb3aa] | 113 | <listitem>
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[2256873] | 114 | <para>Contains compression and un-compression
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| 115 | functions used by some programs</para>
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| 116 | <indexterm zone="ch-system-zlib libz"><primary sortas="c-libz">libz</primary></indexterm>
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[c6cb3aa] | 117 | </listitem>
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| 118 | </varlistentry>
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| 119 | </variablelist>
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[673b0d8] | 120 |
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| 121 | </sect2>
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| 122 |
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| 123 | </sect1>
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[ef13657] | 124 |
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