[llvm-bugs] [Bug 32878] New: Stack-overflow in demangler (1)

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=32878

            Bug ID: 32878
           Summary: Stack-overflow in demangler (1)
           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:
$ for C in $(seq 1 15000); do printf "C"; done > test; echo "" >> test; cat
test | ./cxa_demangle_fuzzer

ASAN says:
==27409==ERROR: AddressSanitizer: stack-overflow on address 0x7ffdf06a8b80 (pc
0x00000084f33b bp 0x7ffdf06a9550 sp 0x7ffdf06a8b80 T0)
    #0 0x84f33a in char const* __cxxabiv1::(anonymous
namespace)::parse_builtin_type<__cxxabiv1::(anonymous namespace)::Db>(char
const*, char const*, __cxxabiv1::(anonymous namespace)::Db&)
/src/llvm_libcxxabi/src/cxa_demangle.cpp:379
    #1 0x5328ee 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:1967:33
    #2 0x53393a 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:1987:29
    #3 0x53393a 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:1987:29
    ...

Cheers,
Manh-Dung Nguyen

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