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=1d9169847886985f2b45fddc458d92244f311a68'>root</a>/<a href='/guix/log/tests?id=1d9169847886985f2b45fddc458d92244f311a68'>tests</a>/<a href='/guix/log/tests/syscalls.scm?id=1d9169847886985f2b45fddc458d92244f311a68'>syscalls.scm</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/tests/syscalls.scm?id=1d9169847886985f2b45fddc458d92244f311a68&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-11-25 16:29:25 +0100'>2023-11-25</span></td><td><a href='/guix/commit/tests/syscalls.scm?id=e04f8fe4ea50f81847cad98a5dc6b32c27b81ea2'>tests: Use ‘test-equal’ for ‘terminal-string-width’ tests.</a><span class='msg-avail'>...<span class='msg-tooltip'>* tests/syscalls.scm ("terminal-string-width English")
("terminal-string-width Japanese"): Use ‘test-equal’.

Change-Id: I3791b2e4c9e35735db6c6da995da8ef0f9a71804
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-11-11 11:07:27 +0100'>2023-11-11</span></td><td><a href='/guix/commit/tests/syscalls.scm?id=fd11d7fbf8e0fcc61ff764dcc0ab737971afc55a'>guix: syscalls: Add terminal-string-width.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/build/syscalls.scm (terminal-width): New procedure.
* tests/syscalls.scm: Add tests.

Change-Id: I6c2caa9fbaffb1e8f4b8933103399be970d5a8f3
</span></span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2021-10-26 12:46:27 +0200'>2021-10-26</span></td><td><a href='/guix/commit/tests/syscalls.scm?id=f87371bf3e952a211782311dad2971c8820a5150'>syscalls: Add 'openpty' and 'login-tty'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/build/syscalls.scm (openpty, login-pty): New procedures.
* tests/syscalls.scm ("openpty", "openpty + login-tty"): New tests.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-02-25 11:29:35 +0100'>2021-02-25</span></td><td><a href='/guix/commit/tests/syscalls.scm?id=7e9d9f28e997e7faad28cdd1c416be174d6986e7'>syscalls: Add 'mounts' and the &lt;mount&gt; record type.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/build/syscalls.scm (&lt;mount&gt;): New record type.
(option-string-&gt;mount-flags, mount-flags)
(octal-decode, mounts): New procedures.
(mount-points): Rewrite in terms of 'mount'.
* tests/syscalls.scm ("mounts"): New test.
</span></span></td><td>Ludovic Courtès</td></tr>