[llvm-bugs] [Bug 32887] New: Stack-overflow in demangler (9)

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https://bugs.llvm.org/show_bug.cgi?id=32887

            Bug ID: 32887
           Summary: Stack-overflow in demangler (9)
           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 "DTc" > test
$ for c in $(seq 1 15000); do printf "c"; done >> test; echo "" >> test; cat
test | ./cxa_demangle_fuzzer
Segmentation fault

==30298==ERROR: AddressSanitizer: stack-overflow on address 0x7ffc68347ea0 (pc
0x000000531fc2 bp 0x7ffc68349830 sp 0x7ffc68347ea0 T0)
    #0 0x531fc1 in char const* __cxxabiv1::(anonymous
namespace)::parse_type<__cxxabiv1::(anonymous namespace)::Db>(char const*, char
const*, __cxxabiv1::(anonymous namespace)::Db&)
/src/llvm_libcxxabi/src/cxa_demangle.cpp:1904
    #1 0x6deaea in char const* __cxxabiv1::(anonymous
namespace)::parse_const_cast_expr<__cxxabiv1::(anonymous namespace)::Db>(char
const*, char const*, __cxxabiv1::(anonymous namespace)::Db&)
/src/llvm_libcxxabi/src/cxa_demangle.cpp:617:25
    #2 0x6deaea 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:3382
    #3 0x6deb27 in char const* __cxxabiv1::(anonymous
namespace)::parse_const_cast_expr<__cxxabiv1::(anonymous namespace)::Db>(char
const*, char const*, __cxxabiv1::(anonymous namespace)::Db&)
/src/llvm_libcxxabi/src/cxa_demangle.cpp:620:30
    #4 0x6deb27 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:3382
    #5 0x6deb27 in char const* __cxxabiv1::(anonymous
namespace)::parse_const_cast_expr<__cxxabiv1::(anonymous namespace)::Db>(char
const*, char const*, __cxxabiv1::(anonymous namespace)::Db&)
/src/llvm_libcxxabi/src/cxa_demangle.cpp:620:30
    #6 0x6deb27 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:3382
    ...

Regards,
Manh-Dung Nguyen

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