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updated ed patch explanation

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git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@2421 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
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Gerard Beekmans 2003-02-04 02:56:15 +00:00
parent f0fbc9826a
commit e5c5f0191d
1 changed files with 6 additions and 7 deletions
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13
chapter06/ed-inst.xml
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@ -8,13 +8,12 @@ because it can be used by the patch program if you encounter an ed-based patch
file. This happens rarely because diff-based patches are preferred these
days.</para></note>
<para>This package requires its patch to be applied before you can
install it. This patch fixes a symlink vulnerability in
<userinput>ed</userinput>. The <userinput>ed</userinput> executable
creates files in <filename class="directory">/tmp</filename> with
predictable names. By using various symlink attacks, it is possible
to have ed write to files it should not, change the permissions of
files, etc.</para>
<para>Ed uses mktemp to create temporary files in <filename
class="directory">/tmp</filename>, but this function has a security
vulnerability (see section on Temporary Files in
<ulink url="http://en.tldp.org/HOWTO/Secure-Programs-HOWTO/avoid-race.html"/>).
This patch makes Ed use mkstemp instead, which is the recommended way to
create temporary files.</para>
<para>Apply the patch:</para>