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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Out of boundary read in Unwind-EHABI.cpp"
href="https://bugs.llvm.org/show_bug.cgi?id=46958">46958</a>
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<tr>
<th>Summary</th>
<td>Out of boundary read in Unwind-EHABI.cpp
</td>
</tr>
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<th>Product</th>
<td>Runtime Libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>libunwind
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
<tr>
<th>Reporter</th>
<td>leadroyal@qq.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>File: llvm/llvm-project/blob/master/libunwind/src/Unwind-EHABI.cpp
Function: _Unwind_VRS_Interpret
Length of one bytecode can be 1 or 2 or more. There has been a boundary check
during interpreting in some of them, but still forget the others.
For example:
Intercept with check:
```
case 0xb1: {
if (offset >= len)
return _URC_FAILURE;
uint8_t registers = getByte(data, offset++);
if (registers & 0xf0 || !registers)
return _URC_FAILURE;
_Unwind_VRS_Pop(context, _UVRSC_CORE, registers, _UVRSD_UINT32);
break;
}
```
Intercept without check:
```
case 0xb3: {
uint8_t v = getByte(data, offset++);
_Unwind_VRS_Pop(context, _UVRSC_VFP,
RegisterRange(static_cast<uint8_t>(v >> 4),
v & 0x0f), _UVRSD_VFPX);
break;
}
```
I think case 0xb3 needs a boundary check. The same situation: 0xc6, 0xc7, 0xc8,
0xc9.</pre>
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