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<p style="margin-top: 0;">On February 25th, 2015, 6:15 p.m. UTC, <b>Matt Jordan</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/4450/diff/1/?file=71624#file71624line293" style="color: black; font-weight: bold; text-decoration: underline;">tags/11.7.0/main/stdtime/localtime.c</a>
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(Diff revision 1)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void common_startup(void) {</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cp">#if 0</span><span class="c"> /* inotify_rm_watch seems unnecessary */</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="c">#define SP_FREE_EX(sp) do { \</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="c"><span class="tb"> </span>if ((sp)->wd[0] > -1) { inotify_rm_watch(inotify_fd, (sp)->wd[0]); (sp)->wd[0] = -1; } \</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="c"><span class="tb"> </span>if ((sp)->wd[1] > -1) { inotify_rm_watch(inotify_fd, (sp)->wd[1]); (sp)->wd[1] = -1; } \</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="c">} while (0)</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">We typically don't leave unused code lying around. I'd go ahead and remove this section if it isn't useful.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">OK. That's only there because a look at the manpage made me wonder about it; hope was that persons more familiar with Linux inotify would clear it up.
I'll remove it for next patch.</pre>
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<p style="margin-top: 0;">On February 25th, 2015, 6:15 p.m. UTC, <b>Matt Jordan</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/4450/diff/1/?file=71624#file71624line482" style="color: black; font-weight: bold; text-decoration: underline;">tags/11.7.0/main/stdtime/localtime.c</a>
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(Diff revision 1)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void *kqueue_daemon(void *data)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="n">fprintf</span><span class="p">(</span><span class="n">stderr</span><span class="p">,</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="s">"kevent %#x on default TZ rules %s</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="p">(</span><span class="kt">unsigned</span> <span class="kt">int</span><span class="p">)</span><span class="n">kev</span><span class="p">.</span><span class="n">fflags</span><span class="p">,</span> <span class="n">sp</span><span class="o">-></span><span class="n">name</span><span class="p">);</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I'm not sure why we are printing out to stderr here, but generally Asterisk does not do that unless (a) the logger couldn't be created and (b) things have gone horribly wrong. That doesn't seem like that would necessarily be the case here.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I agree, no need for a message there. Re. stderr, it's used several other places in original code, so it seemed preferred in this context.</pre>
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<p style="margin-top: 0;">On February 25th, 2015, 6:15 p.m. UTC, <b>Matt Jordan</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/4450/diff/1/?file=71624#file71624line566" style="color: black; font-weight: bold; text-decoration: underline;">tags/11.7.0/main/stdtime/localtime.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void *kqueue_daemon(void *data)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="cm">/* this block guards against a result of a failure return</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span> * from tzload() in several procs, in which tzparse() is then</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span> * called, and that calls tzload() again, unconditionally,</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span> * for TZDEFRULES (e.g., /usr/share/zoneinfo/posixrules);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span> * if errors repeat, each call open(2)s and watches and a</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span> * descriptor leak is the result. So, make sure only one</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span> * 'watch' is used (and if it gets an event, all state are</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">563</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span> * freed).</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span> */</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">565</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="k">if</span> <span class="p">(</span><span class="o">!</span> <span class="n">strcmp</span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="n">TZDEFRULES</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">566</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="k">if</span> <span class="p">(</span><span class="n">psx_sp</span> <span class="o">!=</span> <span class="nb">NULL</span> <span class="o">||</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">567</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span> <span class="p">(</span><span class="n">psx_sp</span> <span class="o">=</span> <span class="n">sstate_alloc</span><span class="p">())</span> <span class="o">==</span> <span class="nb">NULL</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2"></font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">568</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="k">return</span><span class="p">;</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">569</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="p">}</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="n">ast_copy_string</span><span class="p">(</span><span class="n">psx_sp</span><span class="o">-></span><span class="n">name</span><span class="p">,</span> <span class="n">path</span><span class="p">,</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">571</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="k">sizeof</span><span class="p">(</span><span class="n">psx_sp</span><span class="o">-></span><span class="n">name</span><span class="p">));</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="n">sp</span> <span class="o">=</span> <span class="n">psx_sp</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="n">sp</span><span class="o">-></span><span class="n">fd</span> <span class="o">!=</span> <span class="o">-</span><span class="mi">1</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="k">return</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="p">}</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This is not actually thread safe. You cannot guarantee that two threads, at the same time, won't attempt to test and allocate the structure and assign it to psx_sp.
What's more, the initialization of localtime happens very early in the Asterisk startup, and has some very interesting race conditions with forking/threading. I would definitely protect initialization of the psx_sp pointer with a lock.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Good eyes. I proceeded thinking calls to tzload() (which calls aadd_notify()) were guarded by AST_LIST_LOCK(&zonelist) but another look now shows a place where tzload()(and tzparse() and gmtload()) are called between an unlock and another lock (ast_tzset() line 1451 unpatched). Yet other places make the calls while the lock is held.
This is an extra complication.</pre>
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<p>- Ed</p>
<br />
<p>On February 25th, 2015, 4:37 p.m. UTC, Ed Hynan wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By Ed Hynan.</div>
<p style="color: grey;"><i>Updated Feb. 25, 2015, 4:37 p.m.</i></p>
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<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="https://issues.asterisk.org/jira/browse/ASTERISK-24739">ASTERISK-24739</a>
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<b style="color: #575012; font-size: 10pt;">Repository: </b>
Asterisk
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">File descriptor leak on kqueue(2) systems (found on OpenBSD 5.5) on main/stdtime/localtime.c -- TZ data files change watch code within the time functions. (Issue at https://issues.asterisk.org/jira/browse/ASTERISK-24739.)</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Patch initially developed against OpenBSD 5.5 ports package sources, and Asterisk in use. Subsequently developed test program that can run original or patched 11.7.0 code.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>tags/11.7.0/main/stdtime/localtime.c <span style="color: grey">(432235)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/4450/diff/" style="margin-left: 3em;">View Diff</a></p>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">File Attachments </h1>
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<li><a href="https://reviewboard.asterisk.org/media/uploaded/files/2015/02/25/f7a19f2a-4a8a-4aff-b7d6-44a4146c358c__patchtest.tgz">localtime.c (11.7.0) test program</a></li>
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