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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - UBSan failure on NtCurrentTeb()"
href="https://bugs.llvm.org/show_bug.cgi?id=42795">42795</a>
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<th>Summary</th>
<td>UBSan failure on NtCurrentTeb()
</td>
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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>Windows NT
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
</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>jvapen@gmail.com
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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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<pre>UBSan seems to fail when calling NtCurrentTeb.
As I don't have enough knowledge of implementation, I can't tell is this is a
result of clang not initializing some information correctly OR something
strange in the MSVC implementation.
// C:\DevStudio\LLVM_7_0_0\bin\clang-cl.exe /EHsc /std:c++17
-fcolor-diagnostics -ferror-limit=1 -fsanitize=undefined
-fno-sanitize-recover=all m.cpp
#include <iostream>
#include <windows.h>
int main(int, char **) {
std::cout << static_cast<void*>(NtCurrentTeb()) << std::endl;
return 0;
}
<span class="quote">>> Result:</span >
C:\Program Files (x86)\Windows
Kits\10\Include\10.0.17763.0\um\winnt.h:22426:41: runtime error: member access
within null pointer of type 'NT_TIB' (aka '_NT_TIB')</pre>
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