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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Allow to select the segment and offset of the stack canary"
href="https://bugs.llvm.org/show_bug.cgi?id=34831">34831</a>
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<th>Summary</th>
<td>Allow to select the segment and offset of the stack canary
</td>
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<th>Product</th>
<td>libraries
</td>
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<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
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Backend: X86
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>thgarnie@google.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<p>
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<pre>Mirror the behaviour from gcc:
<a href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81708">https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81708</a>
The Linux and Zircon/Magenta kernel is moving to PIE code generation on x86. It
means using -fPIE and removing -mcmodel=kernel. The problem is that
-mcmodel=kernel is used to switch the TLS segment from fs to gs (for stack
cookie or stack-guard on clang).
Gcc went for this format and using the same would be useful:
-mstack-protector-guard-reg=%fs -mstack-protector-guard-offset=0x200</pre>
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