[llvm-bugs] [Bug 32886] New: Segfault in demangler

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=32886

            Bug ID: 32886
           Summary: Segfault in demangler
           Product: libc++abi
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: dungnguy at comp.nus.edu.sg
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

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
(https://github.com/llvm-mirror/libcxxabi/blob/master/fuzz/cxa_demangle_fuzzer.cpp)
to obtain the binary file.

To reproduce:
$ printf "A" > test
$ for a in $(seq 1 15000); do printf "a"; done >> test; echo "" >> test; cat
test | ./cxa_demangle_fuzzer
Segmentation fault

ASAN says:
    #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 0x6cac5f 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:3346:21
    #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 0x6cac5f 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:3346:21
    #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 0x6cac5f 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:3346:21
    ...

Regards,
Manh-Dung Nguyen

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