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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/2182/">https://reviewboard.asterisk.org/r/2182/</a>
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<a href="https://reviewboard.asterisk.org/r/2182/diff/2/?file=32131#file32131line104" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/main/astmm.c</a>
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(Diff revision 2)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">enum func_type {</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="kt">unsigned</span> <span class="kt">int</span> <span class="n">fence</span><span class="p">;</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="kt">unsigned</span> <span class="kt">int</span> <span class="n">fence</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I'm probably being overly pedantic about this, but it's a bit confusing that reg->fence may or may not be the actual fence, depending on how the alignment works out.</pre>
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<a href="https://reviewboard.asterisk.org/r/2182/diff/2/?file=32131#file32131line193" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/main/astmm.c</a>
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(Diff revision 2)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">AST_MUTEX_DEFINE_STATIC_NOTRACKING(reglock);</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">fence</span> <span class="o">=</span> <span class="p">(</span><span class="kt">unsigned</span> <span class="kt">int</span> <span class="o">*</span><span class="p">)</span> <span class="p">(</span><span class="n">reg</span><span class="o">-></span><span class="n">data</span> <span class="o">-</span> <span class="k">sizeof</span><span class="p">(</span><span class="o">*</span><span class="n">fence</span><span class="p">));</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">It's worth a comment as to why you don't just use reg->fence to access the fence.</pre>
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<a href="https://reviewboard.asterisk.org/r/2182/diff/2/?file=32131#file32131line370" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/main/astmm.c</a>
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<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void region_check_fences(struct ast_region *reg)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">fence</span> <span class="o">=</span> <span class="p">(</span><span class="kt">unsigned</span> <span class="kt">int</span> <span class="o">*</span><span class="p">)</span> <span class="p">(</span><span class="n">reg</span><span class="o">-></span><span class="n">data</span> <span class="o">-</span> <span class="k">sizeof</span><span class="p">(</span><span class="o">*</span><span class="n">fence</span><span class="p">));</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">It's worth a comment as to why you don't just use reg->fence to access the fence.</pre>
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<p>- David</p>
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<p>On November 7th, 2012, 2:55 p.m., rmudgett wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By rmudgett.</div>
<p style="color: grey;"><i>Updated Nov. 7, 2012, 2:55 p.m.</i></p>
<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;">MALLOC_DEBUG enhancements.
* Makes malloc() behave like calloc(). It will return a memory block
filled with 0x55. A nonzero value.
* Makes free() fill the released memory block and boundary fence's with
0xdeaddead. Any pointer use after free is going to have a pointer
pointing to 0xdeaddead. The 0xdeaddead pointer is usually an invalid
memory address so a crash is expected.
* Puts the freed memory block into a circular array so it is not reused
immediately.
* When the circular array rotates out a memory block to the heap it checks
that the memory has not been altered from 0xdeaddead.
* Made the astmm_log message wording better.
* Made crash if the DO_CRASH menuselect option is enabled and something is
found.
* Fixed a potential alignment issue on 64 bit systems.
struct ast_region.data[] should now be aligned correctly for all platforms.
* Extracted region_check_fences() from __ast_free_region() and
handle_memory_show().
* Updated handle_memory_show() CLI usage help.
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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;">The MALLOC_DEBUG enhancements were instrumental in pointing out a memory corruption problem.
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/branches/1.8/include/asterisk/astmm.h <span style="color: grey">(376023)</span></li>
<li>/branches/1.8/include/asterisk/utils.h <span style="color: grey">(376023)</span></li>
<li>/branches/1.8/main/asterisk.c <span style="color: grey">(376023)</span></li>
<li>/branches/1.8/main/astmm.c <span style="color: grey">(376023)</span></li>
<li>/branches/1.8/main/utils.c <span style="color: grey">(376023)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/2182/diff/" style="margin-left: 3em;">View Diff</a></p>
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