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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - ASAN allocator may return blocks without right red zone"
href="https://bugs.llvm.org/show_bug.cgi?id=42868">42868</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>ASAN allocator may return blocks without right red zone
</td>
</tr>
<tr>
<th>Product</th>
<td>compiler-rt
</td>
</tr>
<tr>
<th>Version</th>
<td>4.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>asan
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>vitalybuka@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>This regressed at r279572 and still broken on r367246
Usually next page is not mapped and so program may crash on SEGV instead of
nice ASAN report.
clang++ -w test.cc -O1 -fsanitize=address -o /tmp/test
/tmp/test
test: test.cc:13: int main(): Assertion `__asan_address_is_poisoned(p + s)'
failed.
#include <vector>
#include <cassert>
#include <stdlib.h>
extern "C" int __asan_address_is_poisoned(void const volatile *addr);
int main() {
std::vector<char*> allocs;
for (int i = 0; i < 100000; ++i) {
int s = 128;
char *p = (char *)malloc(s);
allocs.push_back(p);
assert(__asan_address_is_poisoned(p + s));
}
assert(!allocs.empty());
for (auto p : allocs)
free(p);
}</pre>
</div>
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