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<h3>
Hal Murray pushed to branch master
at <a href="https://gitlab.com/NTPsec/ntpsec">NTPsec / ntpsec</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/b7759ed8167011f0c619966d9b3e394c49b0cd65">b7759ed8</a></strong>
<div>
<span>by Hal Murray</span>
<i>at 2017-06-04T02:46:27-07:00</i>
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<pre class="commit-message" style="margin: 0; white-space: pre-wrap">Update catchTrap comments
</pre>
</li>
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<h4>1 changed file:</h4>
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<li class="file-stats">
<a href="#4fae7abdbd275fcf752faa4acd4927e0cb01a9f3">
ntpd/ntp_sandbox.c
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<h4>Changes:</h4>
<li id="4fae7abdbd275fcf752faa4acd4927e0cb01a9f3">
<a href="https://gitlab.com/NTPsec/ntpsec/commit/b7759ed8167011f0c619966d9b3e394c49b0cd65#4fae7abdbd275fcf752faa4acd4927e0cb01a9f3"><strong>ntpd/ntp_sandbox.c</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="263" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="background: #fafafa; color: rgba(0,0,0,0.3); padding-left: 0.5em; padding-right: 0.5em" bgcolor="#fafafa">@@ -263,8 +263,6 @@ getgroup:</td>
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<pre style="margin: 0"> <span id="LC263" class="line" lang="c"><span class="cp" style="color: #999; font-weight: bold"># endif </span><span class="cm" style="color: #998; font-style: italic">/* ENABLE_DROPROOT */</span></span>
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<td class="diff-line-num old_line" data-linenumber="264" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">
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<pre style="margin: 0"> <span id="LC264" class="line" lang="c"></span>
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<td class="diff-line-num old_line" data-linenumber="265" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">
265
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<td class="diff-line-num new_line" data-linenumber="265" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">
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<pre style="margin: 0"> <span id="LC265" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic">/* libseccomp sandboxing */</span></span>
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<td class="diff-line-num old old_line" data-linenumber="266" style="background: #f9d7dc; border-right-color: #fac5cd; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0">-<span id="LC266" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic">// Working on ARM</span></span>
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<td class="diff-line-num old old_line" data-linenumber="267" style="background: #f9d7dc; border-right-color: #fac5cd; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#f9d7dc">
267
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<pre style="margin: 0">-<span id="LC267" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic">// #if defined(__x86_64__) || defined(__i386__)</span></span>
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<td class="diff-line-num old_line" data-linenumber="268" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">
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<pre style="margin: 0"> <span id="LC266" class="line" lang="c"><span class="cp" style="color: #999; font-weight: bold">#if defined(HAVE_SECCOMP_H)</span></span>
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<pre style="margin: 0"> <span id="LC267" class="line" lang="c"></span>
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<td class="diff-line-num old_line" data-linenumber="270" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">
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<pre style="margin: 0"> <span id="LC268" class="line" lang="c"><span class="cp" style="color: #999; font-weight: bold">#ifdef ENABLE_KILL_ON_TRAP</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="319" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="317" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="background: #fafafa; color: rgba(0,0,0,0.3); padding-left: 0.5em; padding-right: 0.5em" bgcolor="#fafafa">@@ -319,7 +317,10 @@ int scmp_sc[] = {</td>
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319
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317
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<pre style="margin: 0"> <span id="LC317" class="line" lang="c"> <span class="n" style="color: #333">SCMP_SYS</span><span class="p">(</span><span class="n" style="color: #333">poll</span><span class="p">),</span></span>
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<pre style="margin: 0"> <span id="LC318" class="line" lang="c"> <span class="n" style="color: #333">SCMP_SYS</span><span class="p">(</span><span class="n" style="color: #333">pselect6</span><span class="p">),</span></span>
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<td class="diff-line-num old_line" data-linenumber="321" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">
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<pre style="margin: 0"> <span id="LC319" class="line" lang="c"> <span class="n" style="color: #333">SCMP_SYS</span><span class="p">(</span><span class="n" style="color: #333">read</span><span class="p">),</span></span>
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<pre style="margin: 0">-<span id="LC322" class="line" lang="c"> <span class="n" style="color: #333">SCMP_SYS</span><span class="p">(</span><span class="n" style="color: #333">recvfrom</span><span class="p">),</span></span>
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<pre style="margin: 0">+<span id="LC320" class="line" lang="c"> <span class="n" style="color: #333">SCMP_SYS</span><span class="p">(</span><span class="n" style="color: #333">recvfrom</span><span class="p">),</span> <span class="cm" style="color: #998; font-style: italic">/* Comment this out for testing.</span></span>
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<pre style="margin: 0">+<span id="LC321" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * It will die on the first reply.</span></span>
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<pre style="margin: 0">+<span id="LC322" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * (Or maybe sooner if a request arrives.)</span></span>
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<pre style="margin: 0">+<span id="LC323" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> */</span></span>
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323
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<td class="diff-line-num new_line" data-linenumber="324" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">
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<pre style="margin: 0"> <span id="LC324" class="line" lang="c"> <span class="n" style="color: #333">SCMP_SYS</span><span class="p">(</span><span class="n" style="color: #333">recvmsg</span><span class="p">),</span></span>
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<pre style="margin: 0"> <span id="LC325" class="line" lang="c"> <span class="n" style="color: #333">SCMP_SYS</span><span class="p">(</span><span class="n" style="color: #333">rename</span><span class="p">),</span></span>
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<pre style="margin: 0"> <span id="LC326" class="line" lang="c"> <span class="n" style="color: #333">SCMP_SYS</span><span class="p">(</span><span class="n" style="color: #333">rt_sigaction</span><span class="p">),</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="349" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="background: #fafafa; color: rgba(0,0,0,0.3); padding-left: 0.5em; padding-right: 0.5em" bgcolor="#fafafa">@@ -348,6 +349,10 @@ int scmp_sc[] = {</td>
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348
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349
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<pre style="margin: 0"> <span id="LC349" class="line" lang="c"> <span class="n" style="color: #333">SCMP_SYS</span><span class="p">(</span><span class="n" style="color: #333">unlink</span><span class="p">),</span></span>
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349
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<pre style="margin: 0"> <span id="LC350" class="line" lang="c"></span>
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350
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351
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<pre style="margin: 0"> <span id="LC351" class="line" lang="c"><span class="cp" style="color: #999; font-weight: bold">#ifdef ENABLE_DNS_LOOKUP</span></span>
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352
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<pre style="margin: 0">+<span id="LC352" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic">/* Don't comment out this block for testing.</span></span>
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<pre style="margin: 0">+<span id="LC353" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * pthread_create blocks signals so it will crash</span></span>
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354
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<pre style="margin: 0">+<span id="LC354" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * rather than generate a trap.</span></span>
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355
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<pre style="margin: 0">+<span id="LC355" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> */</span></span>
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351
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<pre style="margin: 0"> <span id="LC356" class="line" lang="c"> <span class="n" style="color: #333">SCMP_SYS</span><span class="p">(</span><span class="n" style="color: #333">clone</span><span class="p">),</span> <span class="cm" style="color: #998; font-style: italic">/* threads */</span></span>
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352
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357
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<pre style="margin: 0"> <span id="LC357" class="line" lang="c"> <span class="n" style="color: #333">SCMP_SYS</span><span class="p">(</span><span class="n" style="color: #333">futex</span><span class="p">),</span> <span class="cm" style="color: #998; font-style: italic">/* sem_xxx, used by threads */</span></span>
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353
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358
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<pre style="margin: 0"> <span id="LC358" class="line" lang="c"> <span class="n" style="color: #333">SCMP_SYS</span><span class="p">(</span><span class="n" style="color: #333">kill</span><span class="p">),</span> <span class="cm" style="color: #998; font-style: italic">/* generate signal */</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="425" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="430" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="background: #fafafa; color: rgba(0,0,0,0.3); padding-left: 0.5em; padding-right: 0.5em" bgcolor="#fafafa">@@ -425,6 +430,9 @@ int scmp_sc[] = {</td>
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425
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430
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<pre style="margin: 0"> <span id="LC430" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * catchTrap - get here if something missing from list above</span></span>
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426
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<pre style="margin: 0"> <span id="LC431" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * (or a bad guy finds a way in)</span></span>
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427
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432
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<pre style="margin: 0"> <span id="LC432" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> *</span></span>
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433
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<pre style="margin: 0">+<span id="LC433" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * You won't get here if SIGSYS is blocked.</span></span>
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<pre style="margin: 0">+<span id="LC434" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * That happens in pthread_create() See above at ENABLE_DNS_LOOKUP</span></span>
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435
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<pre style="margin: 0">+<span id="LC435" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> *</span></span>
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428
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436
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<pre style="margin: 0"> <span id="LC436" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * The list above is a moving target. Most syscalls will be</span></span>
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429
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437
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<pre style="margin: 0"> <span id="LC437" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * obvious but libc (and friends) can remap things and</span></span>
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430
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438
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<pre style="margin: 0"> <span id="LC438" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * getaddrinfo does all sorts of syscalls.</span></span>
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<td class="line_content match " style="background: #fafafa; color: rgba(0,0,0,0.3); padding-left: 0.5em; padding-right: 0.5em" bgcolor="#fafafa">@@ -432,12 +440,22 @@ int scmp_sc[] = {</td>
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<pre style="margin: 0"> <span id="LC440" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * To track down a missing call:</span></span>
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<pre style="margin: 0"> <span id="LC441" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> *</span></span>
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<pre style="margin: 0"> <span id="LC442" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * Option one:</span></span>
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<pre style="margin: 0">-<span id="LC435" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * use gdb, break on catchTrap, get a trace.</span></span>
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<pre style="margin: 0">+<span id="LC443" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * The code below should print out the syscall number.</span></span>
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<pre style="margin: 0">+<span id="LC444" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * grep _NR_ /usr/include/ -r | grep <number here> -w</span></span>
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<pre style="margin: 0">+<span id="LC445" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * You will get several hits for various architures/modes.</span></span>
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<pre style="margin: 0">+<span id="LC446" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * You can probably guess the right one.</span></span>
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<pre style="margin: 0"> <span id="LC447" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> *</span></span>
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<pre style="margin: 0"> <span id="LC448" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * Option two:</span></span>
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<pre style="margin: 0"> <span id="LC449" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * use strace</span></span>
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<pre style="margin: 0"> <span id="LC450" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * sudo strace -t -f -o<filename> <path-to-ntpd> <args></span></span>
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<pre style="margin: 0">-<span id="LC440" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * when it crashes, the last syscall will be at the end of the log file</span></span>
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<pre style="margin: 0">+<span id="LC451" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * When it crashes, the last syscall will be near the end of the log file</span></span>
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<pre style="margin: 0">+<span id="LC452" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * just before the line with "--- SIGSYS", a page or two from the end</span></span>
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<pre style="margin: 0">+<span id="LC453" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * depending on the stack trace.</span></span>
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<pre style="margin: 0">+<span id="LC454" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> *</span></span>
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<pre style="margin: 0">+<span id="LC455" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * Option three:</span></span>
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<pre style="margin: 0">+<span id="LC456" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * use gdb, break on catchTrap, get a trace.</span></span>
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<pre style="margin: 0">+<span id="LC457" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * If you have the symbols, you can probably guess the syscall.</span></span>
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<pre style="margin: 0">+<span id="LC458" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> * You may have to get the sources for libc.</span></span>
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459
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<pre style="margin: 0"> <span id="LC459" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> *</span></span>
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442
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460
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<pre style="margin: 0"> <span id="LC460" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic"> */</span></span>
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443
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461
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<pre style="margin: 0"> <span id="LC461" class="line" lang="c"><span class="k" style="font-weight: bold">static</span> <span class="kt" style="color: #458; font-weight: bold">void</span> <span class="nf" style="color: #900; font-weight: bold">catchTrap</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: bold">int</span> <span class="n" style="color: #333">sig</span><span class="p">,</span> <span class="n" style="color: #333">siginfo_t</span> <span class="o" style="font-weight: bold">*</span><span class="n" style="color: #333">si</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: bold">void</span> <span class="o" style="font-weight: bold">*</span><span class="n" style="color: #333">u</span><span class="p">)</span></span>
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