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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - __attribute__((naked)) doesn't disable sanitizer instrumentation"
href="https://bugs.llvm.org/show_bug.cgi?id=45400">45400</a>
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<th>Summary</th>
<td>__attribute__((naked)) doesn't disable sanitizer instrumentation
</td>
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<th>Product</th>
<td>compiler-rt
</td>
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<th>Version</th>
<td>10.0
</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>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>tsan
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>ant.bikineev@gmail.com
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</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>With sanitizers enabled, clang still generates instrumented code for functions
marked with __attribute__((naked)):
extern "C" __attribute__((naked))
void PushAllRegistersAndIterateStack() {
asm("ret");
}
with -fsanitize=thread is compiled into
PushAllRegistersAndIterateStack: # @PushAllRegistersAndIterateStack
mov rdi, qword ptr [rbp + 8]
call __tsan_func_entry
ret
(<a href="https://godbolt.org/z/XPstQ1">https://godbolt.org/z/XPstQ1</a>)
The problem is also reproduced at least with ubsan.
I assume that __attribute__((naked)) should entail no_sanitize(*). GCC's
behaviour is as expected (no instrumented code is generated).</pre>
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