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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Libc++ is not Implicit Integer Truncation Sanitizer clean"
href="https://bugs.llvm.org/show_bug.cgi?id=40566">40566</a>
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<th>Summary</th>
<td>Libc++ is not Implicit Integer Truncation Sanitizer clean
</td>
</tr>
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<th>Product</th>
<td>libc++
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>All Bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>eugeni.stepanov@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
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<pre>#include <sstream>
int main() {
std::stringstream ss;
ss.write("\xd1", 1);
}
with -fsanitize=implicit-signed-integer-truncation gives:
include/c++/v1/sstream:561:28: runtime error: implicit conversion from type
'std::__1::basic_stringbuf<char, std::__1::char_traits<char>,
std::__1::allocator<char> >::int_type' (aka 'int') of value 209 (32-bit,
signed) to type 'std::__1::basic_streambuf<char, std::__1::char_traits<char>
<span class="quote">>::char_type' (aka 'char') changed the value to -47 (8-bit, signed)</span >
basic_stringbuf::overflow converts an int, which is the result of char ->
unsigned char -> int conversion, directly to (signed) char.</pre>
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