<html>
<head>
<base href="https://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - The correct implementation of __cfi_slowpath"
href="https://llvm.org/bugs/show_bug.cgi?id=26033">26033</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>The correct implementation of __cfi_slowpath
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>hjl.tools@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>ControlFlowIntegrityDesign.rst has
CFI_SlowPath
------------
The slow path check is implemented in compiler-rt library as
.. code-block:: none
void __cfi_slowpath(uint64 CallSiteTypeId, void *TargetAddr)
This functions loads a shadow value for ``TargetAddr``, finds the
address of __cfi_check as described above and calls that.
However __cfi_slowpath is implemented as
xtern "C" SANITIZER_INTERFACE_ATTRIBUTE
void __cfi_slowpath(uptr CallSiteTypeId, void *Ptr) {
uptr Addr = (uptr)Ptr;
VReport(3, "__cfi_slowpath: %zx, %p\n", CallSiteTypeId, Ptr);
ShadowValue sv = ShadowValue::load(Addr);
if (sv.is_invalid()) {
VReport(2, "CFI: invalid memory region for a function pointer (shadow==0):
%p\n", Ptr);
Die();
}
uptr != uint64 for 32-bit target.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>