Fix CVE-2017-16844:

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-16844
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=876511

Patch copied from Debian procmail package 3.22-26:

http://http.debian.net/debian/pool/main/p/procmail/procmail_3.22-26.debian.tar.xz

From: Santiago Vila <sanvila@debian.org>
Subject: Fix heap-based buffer overflow in loadbuf()
Bug-Debian: http://bugs.debian.org/876511
X-Debian-version: 3.22-26

--- a/src/formisc.c
+++ b/src/formisc.c
@@ -103,7 +103,7 @@
 }
 							    /* append to buf */
 void loadbuf(text,len)const char*const text;const size_t len;
-{ if(buffilled+len>buflen)			  /* buf can't hold the text */
+{ while(buffilled+len>buflen)			  /* buf can't hold the text */
      buf=realloc(buf,buflen+=Bsize);
   tmemmove(buf+buffilled,text,len);buffilled+=len;
 }
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<tr><td><span title='2022-09-22 16:00:29 +0200'>2022-09-22</span></td><td><a href='/guix/commit/gnu/installer/user.scm?id=4814ec284f8a2870e6457c05f414ad31df4e3f57'>installer: Move &lt;secret&gt; to utils and use it for crypt passwords.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/installer/user.scm (&lt;secret&gt;, secret?, make-secret, secret-content): Move
to utils.scm.
* gnu/installer/utils.scm (&lt;secret&gt;, secret?, make-secret, secret-content):
Moved from user.scm.
* gnu/installer/newt/partition.scm (prompt-luks-passwords): Make password a
&lt;secret&gt;.
* gnu/installer/parted.scm (luks-format-and-open): Unwrap secret.

Signed-off-by: Mathieu Othacehe &lt;othacehe@gnu.org&gt;
</span></span></td><td>Josselin Poiret</td></tr>
<tr><td><span title='2022-08-08 11:54:25 +0200'>2022-08-08</span></td><td><a href='/guix/commit/gnu/installer/user.scm?id=ff9522fb69b9f4a31a5b766029e26dc53a2d1cf8'>installer: Add comments and vertical space to the generated config.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/installer/parted.scm (user-partitions-&gt;configuration): Introduce
vertical space and a comment.
* gnu/installer/services.scm (G_): New macro.
(%system-services): Add comment for OpenSSH.
(system-services-&gt;configuration): Add vertical space and comments.
* gnu/installer/user.scm (users-&gt;configuration): Add comment.
* gnu/installer/steps.scm (format-configuration): Add comment.
(configuration-&gt;file): Expound leading comment.  Pass #:format-comment
to 'pretty-print-with-comments/splice'.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-05-21 00:15:08 +0200'>2022-05-21</span></td><td><a href='/guix/commit/gnu/installer/user.scm?id=48c748226e2a94d2dec9bfdf84601455f00d6f5e'>Revert "installer: user: Remove useless filtering."</a><span class='msg-avail'>...<span class='msg-tooltip'>This reverts commit c2125e59d0774cda3e559adeb056459a5f23586b.

Fixes &lt;https://issues.guix.gnu.org/55361&gt;.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-04-06 21:19:08 +0200'>2022-04-06</span></td><td><a href='/guix/commit/gnu/installer/user.scm?id=c2125e59d0774cda3e559adeb056459a5f23586b'>installer: user: Remove useless filtering.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/installer/user.scm (users-&gt;configuration): Remove root account filtering
that is now performed in the "run-user-add-page" procedure.
</span></span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2022-02-02 16:46:44 +0100'>2022-02-02</span></td><td><a href='/guix/commit/gnu/installer/user.scm?id=112ef30b84744872b3a7617d9e54b3df5db95560'>installer: Turn passwords into opaque records.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/installer/user.scm (&lt;secret&gt;, secret?, make-secret,
secret-content): Add opaque &lt;secret&gt; record that boxes its contents,
with a custom printer that doesn't display anything.
* gnu/installer/newt/user.scm (run-user-add-page, run-user-page): Box
it.
* gnu/installer/final.scm (create-user-database): Unbox it.

Signed-off-by: Mathieu Othacehe &lt;othacehe@gnu.org&gt;
</span></span></td><td>Josselin Poiret</td></tr>