https://bugs.llvm.org/show_bug.cgi?id=42795
Bug ID: 42795
Summary: UBSan failure on NtCurrentTeb()
Product: clang
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
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;
}
>> Result:
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')
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