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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Stack-overflow in demangler (11)"
href="https://bugs.llvm.org/show_bug.cgi?id=32889">32889</a>
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<tr>
<th>Summary</th>
<td>Stack-overflow in demangler (11)
</td>
</tr>
<tr>
<th>Product</th>
<td>libc++abi
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>dungnguy@comp.nus.edu.sg
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
</tr></table>
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<div>
<pre>Dear All,
This bug was found with AFLGo, a directed version of AFL/AFLFast. Thanks also
to Marcel Böhme and Van-Thuan Pham.
First, you need to build the project
(<a href="https://github.com/llvm-mirror/libcxxabi/blob/master/fuzz/cxa_demangle_fuzzer.cpp">https://github.com/llvm-mirror/libcxxabi/blob/master/fuzz/cxa_demangle_fuzzer.cpp</a>)
to obtain the binary file.
To reproduce:
$ printf "DTc" > test
$ for o in $(seq 1 15000); do printf "o"; done >> test; echo "" >> test; cat
test | ./cxa_demangle_fuzzer
Segmentation fault
ASAN says:
==30344==ERROR: AddressSanitizer: stack-overflow on address 0x7fffe25c2700 (pc
0x0000006c554e bp 0x7fffe25c4eb0 sp 0x7fffe25c2700 T0)
#0 0x6c554d in char const* __cxxabiv1::(anonymous
namespace)::parse_expression<__cxxabiv1::(anonymous namespace)::Db>(char
const*, char const*, __cxxabiv1::(anonymous namespace)::Db&)
/src/llvm_libcxxabi/src/cxa_demangle.cpp:3321
#1 0x75db2f in char const* __cxxabiv1::(anonymous
namespace)::parse_binary_expression<__cxxabiv1::(anonymous namespace)::Db>(char
const*, char const*, __cxxabiv1::(anonymous namespace)::Db::String const&,
__cxxabiv1::(anonymous namespace)::Db&)
/src/llvm_libcxxabi/src/cxa_demangle.cpp:3252:22
#2 0x6c862f in char const* __cxxabiv1::(anonymous
namespace)::parse_expression<__cxxabiv1::(anonymous namespace)::Db>(char
const*, char const*, __cxxabiv1::(anonymous namespace)::Db&)
/src/llvm_libcxxabi/src/cxa_demangle.cpp:3620:21
#3 0x75db2f in char const* __cxxabiv1::(anonymous
namespace)::parse_binary_expression<__cxxabiv1::(anonymous namespace)::Db>(char
const*, char const*, __cxxabiv1::(anonymous namespace)::Db::String const&,
__cxxabiv1::(anonymous namespace)::Db&)
/src/llvm_libcxxabi/src/cxa_demangle.cpp:3252:22
#4 0x6c862f in char const* __cxxabiv1::(anonymous
namespace)::parse_expression<__cxxabiv1::(anonymous namespace)::Db>(char
const*, char const*, __cxxabiv1::(anonymous namespace)::Db&)
/src/llvm_libcxxabi/src/cxa_demangle.cpp:3620:21
#5 0x75db2f in char const* __cxxabiv1::(anonymous
namespace)::parse_binary_expression<__cxxabiv1::(anonymous namespace)::Db>(char
const*, char const*, __cxxabiv1::(anonymous namespace)::Db::String const&,
__cxxabiv1::(anonymous namespace)::Db&)
/src/llvm_libcxxabi/src/cxa_demangle.cpp:3252:22
#6 0x6c862f in char const* __cxxabiv1::(anonymous
namespace)::parse_expression<__cxxabiv1::(anonymous namespace)::Db>(char
const*, char const*, __cxxabiv1::(anonymous namespace)::Db&)
/src/llvm_libcxxabi/src/cxa_demangle.cpp:3620:21
Regards,
Manh-Dung Nguyen</pre>
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