[Bug demangler/85452] New: Stack-Overflow in nm-new / C++ name demangler (binuitils-2.30-15ubuntu1)

["sergej at schumilo dot de" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85452

            Bug ID: 85452
           Summary: Stack-Overflow in nm-new / C++ name demangler
                    (binuitils-2.30-15ubuntu1)
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: demangler
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sergej at schumilo dot de
  Target Milestone: ---

Dear all,
according to the bintutils maintainers the following stack-overflow bug is in
the C++ name demangler (instead of the binutils application nm-new), which is
part of the libiberty library. 

This is the original binutils bug report
(https://sourceware.org/bugzilla/show_bug.cgi?id=23058):

-----------------------------------------------------------------------------

Dear all,
after reporting the following bugs to the Ubuntu security team
(https://bugs.launchpad.net/ubuntu/+source/binutils/+bug/1763099), we were
asked to report them directly to the binutils developers: 

----------------------------------------------------

Dear all,
The following binutils nm-new Stack-Overflow was found by a modified version of
the kAFL fuzzer (https://github.com/RUB-SysSec/kAFL). I have attached the
crashing input and an ASAN report.

Steps to reproduce:

Build current verison of binutils:
```
pull-lp-source binutils
cd binutils-2.30
CC=clang CXX=clang++ CFLAGS="-fsanitize=address -fsanitize-recover=address
-ggdb" CXXFLAGS="-fsanitize=address -fsanitize-recover=address -ggdb"
LDFLAGS="-fsanitize=address" ./configure
CC=clang CXX=clang++ CFLAGS="-fsanitize=address -fsanitize-recover=address
-ggdb" CXXFLAGS="-fsanitize=address
-fsanitize-recover=address -ggdb" LDFLAGS="-fsanitize=address" make
```

Run inputs under ASAN:

```
ASAN_OPTIONS=halt_on_error=true:allow_addr2line=true ./nm-new a -C -l
--synthetic $file
```

We can verify this issue for nm-new binuitils-2.30-15ubuntu1 (Ubuntu 16.04.4
LTS / sources from "pull-lp-source bintuils").

Credits: Sergej Schumilo, Cornelius Aschermann (both of Ruhr-Universität
Bochum)

Best regards,
Sergej Schumilo