update gzip patch expl.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@2424 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter06/gzip-inst.xml

@@ -3,9 +3,10 @@
 <sect2>
 <title>Installation of Gzip</title>
 
-<para>A buffer overflow may occur if <userinput>gzip</userinput>
-encounters a filename over 1020 characters in length. Apply the
-patch to fix this problem:</para>
+<para>The following patch fixes a buffer overflow that occurs when a
+filename is longer than 1020 characters. It does this by inserting a check
+that the buffer is large enough for the given filename. The program exits
+with the message "Filename too long" the buffer is not large enough.</para>
 
 <para><screen><userinput>patch -Np1 -i ../gzip-&gzip-patch-version;.patch</userinput></screen></para>