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='2023-10-28 01:30:37 +0200'>2023-10-28</span></td><td><a href='/guix/commit/tests/guix-pack.sh?id=ff1146fb4f7254a8f644f89d7af6b4b566528603'>tests: Adjust to cope with glibc graft.</a><span class='msg-avail'>...<span class='msg-tooltip'>This is a followup to 1328c4cca531318e3ed90c6aecb522a5b22a4bcc, which
led to failures for tests that were not prepared to cope with that.

* tests/guix-environment-container.sh (hello_drv_nested): Pass “-E
GUIX_BUILD_OPTIONS” so ‘--no-grafts’ is passed.
* tests/guix-pack.sh (GUIX_BUILD_OPTIONS): Add ‘--no-grafts’.
* tests/transformations.scm ("options-&gt;transformation, with-graft"):
Skip when ‘glibc-final’ has a replacement.

Change-Id: Ia65c9aeb06f524252815b8290a5ca7bf97ee8136
</span></span></td><td>Ludovic Courtès</td></tr>