Fix CVE-2016-6321:

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6321
https://security-tracker.debian.org/tracker/CVE-2016-6321

Patch adapted from upstream source repository (the changes to 'NEWS'
don't apply to the Tar 1.29 release tarball).

http://git.savannah.gnu.org/cgit/tar.git/commit/?id=7340f67b9860ea0531c1450e5aa261c50f67165d

From 7340f67b9860ea0531c1450e5aa261c50f67165d Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@Penguin.CS.UCLA.EDU>
Date: Sat, 29 Oct 2016 21:04:40 -0700
Subject: [PATCH] When extracting, skip ".." members

* NEWS: Document this.
* src/extract.c (extract_archive): Skip members whose names
contain "..".
---
 NEWS          | 8 +++++++-
 src/extract.c | 8 ++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/extract.c b/src/extract.c
index f982433..7904148 100644
--- a/src/extract.c
+++ b/src/extract.c
@@ -1629,12 +1629,20 @@ extract_archive (void)
 {
   char typeflag;
   tar_extractor_t fun;
+  bool skip_dotdot_name;
 
   fatal_exit_hook = extract_finish;
 
   set_next_block_after (current_header);
 
+  skip_dotdot_name = (!absolute_names_option
+		      && contains_dot_dot (current_stat_info.orig_file_name));
+  if (skip_dotdot_name)
+    ERROR ((0, 0, _("%s: Member name contains '..'"),
+	    quotearg_colon (current_stat_info.orig_file_name)));
+
   if (!current_stat_info.file_name[0]
+      || skip_dotdot_name
       || (interactive_option
 	  && !confirm ("extract", current_stat_info.file_name)))
     {
-- 
2.11.0

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<tr><td><span title='2019-02-26 17:12:30 -0500'>2019-02-26</span></td><td><a href='/guix/commit/gnu/packages/simulation.scm?id=3a261950acd3f6d156eb34b833e5b63116917990'>gnu: fenics-dolfin: Fix build.</a><span class='msg-avail'>...</span></td><td>Paul Garlick</td></tr>
<tr><td><span title='2019-02-20 21:39:35 +0100'>2019-02-20</span></td><td><a href='/guix/commit/gnu/packages/simulation.scm?id=7a82074ca6cc616bc26dbc8b343cdd49406afeca'>gnu: python-fenics-dijitso: Fix build.</a><span class='msg-avail'>...</span></td><td>Paul Garlick</td></tr>
<tr><td><span title='2019-01-15 14:46:44 +0100'>2019-01-15</span></td><td><a href='/guix/commit/gnu/packages/simulation.scm?id=44d10b1f722856ab8e9b942804aa7ef33e2ef739'>gnu: Separate Python core packages from the rest.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2019-01-07 14:41:00 +0100'>2019-01-07</span></td><td><a href='/guix/commit/gnu/packages/simulation.scm?id=6fd5a80dbe7013fc37aa1228051d02b42ee76527'>gnu: Remove unnecessary build-side module imports.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-12-04 10:58:56 +0100'>2018-12-04</span></td><td><a href='/guix/commit/gnu/packages/simulation.scm?id=dd6cb4a0afc40f6cab79824e792d8aa630a5bd69'>gnu: fenics: Skip extra demo in 'check' phase.</a><span class='msg-avail'>...</span></td><td>Paul Garlick</td></tr>
<tr><td><span title='2018-12-02 00:20:04 +0100'>2018-12-02</span></td><td><a href='/guix/commit/gnu/packages/simulation.scm?id=886d833e39fe5a193abaf486e64d8f35ac491b27'>gnu: openfoam: Adjust for glibc 2.28.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-11-14 21:34:09 +0100'>2018-11-14</span></td><td><a href='/guix/commit/gnu/packages/simulation.scm?id=ae0f1dd1a496d489aab5a2ea46f916a9b96d3618'>gnu: Add fenics.</a><span class='msg-avail'>...</span></td><td>Paul Garlick</td></tr>
<tr><td><span title='2018-11-14 21:34:09 +0100'>2018-11-14</span></td><td><a href='/guix/commit/gnu/packages/simulation.scm?id=0ace6c0b842660563b961069824ef0f823e6b24d'>gnu: Add fenics-dolfin.</a><span class='msg-avail'>...</span></td><td>Paul Garlick</td></tr>
<tr><td><span title='2018-11-14 21:34:09 +0100'>2018-11-14</span></td><td><a href='/guix/commit/gnu/packages/simulation.scm?id=6b7f1f8afa996e8882d2ca9145d39bbabf85c160'>gnu: Add python-fenics-ffc.</a><span class='msg-avail'>...</span></td><td>Paul Garlick</td></tr>
<tr><td><span title='2018-11-14 21:34:08 +0100'>2018-11-14</span></td><td><a href='/guix/commit/gnu/packages/simulation.scm?id=0fc499834f7357a8bb76cca06b8979c67961b316'>gnu: Add python-fenics-fiat.</a><span class='msg-avail'>...</span></td><td>Paul Garlick</td></tr>
<tr><td><span title='2018-11-14 21:34:08 +0100'>2018-11-14</span></td><td><a href='/guix/commit/gnu/packages/simulation.scm?id=3941cf5afa8cca3852651defb8e55dec89dee19c'>gnu: Add python-fenics-ufl.</a><span class='msg-avail'>...</span></td><td>Paul Garlick</td></tr>
<tr><td><span title='2018-11-14 21:34:08 +0100'>2018-11-14</span></td><td><a href='/guix/commit/gnu/packages/simulation.scm?id=f7a4757a4cabfe70f07216ab3f7eac60a80b82ad'>gnu: Add python-fenics-dijitso.</a><span class='msg-avail'>...</span></td><td>Paul Garlick</td></tr>