Fix CVE-2018-1000097:

https://security-tracker.debian.org/tracker/CVE-2018-1000097
https://nvd.nist.gov/vuln/detail/CVE-2018-1000097

Patch taken from upstream bug report:
https://lists.gnu.org/archive/html/bug-gnu-utils/2018-02/msg00005.html

diff --git a/src/unshar.c b/src/unshar.c
index 80bc3a9..0fc3773 100644
--- a/src/unshar.c
+++ b/src/unshar.c
@@ -240,7 +240,7 @@ find_archive (char const * name, FILE * file, off_t start)
       off_t position = ftello (file);
 
       /* Read next line, fail if no more and no previous process.  */
-      if (!fgets (rw_buffer, BUFSIZ, file))
+      if (!fgets (rw_buffer, rw_base_size, file))
 	{
 	  if (!start)
 	    error (0, 0, _("Found no shell commands in %s"), name);
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<div class='path'>path: <a href='/guix/log/?id=aabfddbe8bc16fa82067e88e7d79c8c1bc802414'>root</a>/<a href='/guix/log/gnu?id=aabfddbe8bc16fa82067e88e7d79c8c1bc802414'>gnu</a>/<a href='/guix/log/gnu/packages?id=aabfddbe8bc16fa82067e88e7d79c8c1bc802414'>packages</a>/<a href='/guix/log/gnu/packages/patches?id=aabfddbe8bc16fa82067e88e7d79c8c1bc802414'>patches</a>/<a href='/guix/log/gnu/packages/patches/gdm-pass-gdk-pixbuf-loader-env.patch?id=aabfddbe8bc16fa82067e88e7d79c8c1bc802414'>gdm-pass-gdk-pixbuf-loader-env.patch</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/patches/gdm-pass-gdk-pixbuf-loader-env.patch?id=aabfddbe8bc16fa82067e88e7d79c8c1bc802414&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
ix Lechner</td></tr>
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Thanks to Bruno Victal "mirai" for cooperating on this patch and for
generously sharing a wealth of insights about Guix services.

Thanks to Jean-Baptiste Note for an early version of this service!

* doc/guix.texi (Linux Services)[Cachefilesd Service]: New heading.
* gnu/services/linux.scm (serialize-string, non-negative-integer?)
(serialize-non-negative-integer, string, non-negative-integer)
(make-option-serializer, make-percentage-threshold-serializer): New
procedures.
(cachefilesd-configuration): New record type.
(cachefilesd-service-type): New variable.
* gnu/tests/cachefilesd.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.

Co-authored-by: Bruno Victal &lt;mirai@makinata.eu&gt;
Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;


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