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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Support -mstack-protector-guard=sysreg for arm64 and riscv"
href="https://bugs.llvm.org/show_bug.cgi?id=47341">47341</a>
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<th>Summary</th>
<td>Support -mstack-protector-guard=sysreg for arm64 and riscv
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<th>Product</th>
<td>clang
</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>Linux
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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>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>keescook@chromium.org
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>The Linux kernel uses this for having a per-thread stack canary. Implementing
this for both arm64 and riscv is desired.
For example, gcc's arm64 support is used like this in the kernel:
-mstack-protector-guard=sysreg
-mstack-protector-guard-reg=sp_el0
-mstack-protector-guard-offset=0
<a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0a1213fa7432778b71a1c0166bf56660a3aab030">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0a1213fa7432778b71a1c0166bf56660a3aab030</a>
Here are discussions on the start of riscv support:
<a href="https://lore.kernel.org/lkml/CAJF2gTTr_ENhGRmjqNbGBhEc8y4D3YSqAResvwHuB1ykemKTUw@mail.gmail.com/">https://lore.kernel.org/lkml/CAJF2gTTr_ENhGRmjqNbGBhEc8y4D3YSqAResvwHuB1ykemKTUw@mail.gmail.com/</a></pre>
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