[Bug binutils/28296] New: [nm] Stack overflow in demangler_path

[irfanariq at kaist dot ac.kr]

https://sourceware.org/bugzilla/show_bug.cgi?id=28296

            Bug ID: 28296
           Summary: [nm] Stack overflow in demangler_path
           Product: binutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: irfanariq at kaist dot ac.kr
  Target Milestone: ---

Created attachment 13642
  --> https://sourceware.org/bugzilla/attachment.cgi?id=13642&action=edit
poc and full stack trace

Hello,

We are currently working on fuzz testing feature, and we found a stack overflow
error on nm.

The stack traces are as follow:
==618==ERROR: AddressSanitizer: stack-overflow on address 0x7fff51a74ea8 (pc
0x7f55b9e42509 bp 0x7fff51a75710 sp 0x7fff51a74e80 T0)
    #0 0x7f55b9e42508  (/usr/lib/x86_64-linux-gnu/libasan.so.4+0x79508)
    #1 0x5592e730643c in str_buf_append rust-demangle.c:1493
    #2 0x5592e7306483 in str_buf_demangle_callback rust-demangle.c:1500
    #3 0x5592e72fffc4 in print_str rust-demangle.c:273
    #4 0x5592e7302b82 in demangle_path rust-demangle.c:746
    #5 0x5592e7302c00 in demangle_path rust-demangle.c:756
    #6 0x5592e7303d65 in demangle_type rust-demangle.c:1031
    #7 0x5592e7303cd3 in demangle_type rust-demangle.c:1024
    #8 0x5592e7303348 in demangle_type rust-demangle.c:903
    #9 0x5592e7302b91 in demangle_path rust-demangle.c:747
    #10 0x5592e7302c00 in demangle_path rust-demangle.c:756
    #11 0x5592e7303d65 in demangle_type rust-demangle.c:1031
    #12 0x5592e7303cd3 in demangle_type rust-demangle.c:1024
    #13 0x5592e7303348 in demangle_type rust-demangle.c:903
    #14 0x5592e7302b91 in demangle_path rust-demangle.c:747
    #15 0x5592e7302c00 in demangle_path rust-demangle.c:756
    ...

The full stack trace is attached.

**Step to reproduce**

We configured nm using 

$ CFLAGS="-g -O0 -fsanitize=address" ./configure --disable-shared
--enable-targets=all 

, and built it using 

$ make -j10; make install

, and run it with:

$ ./nm -C <input file>

The input file is attached.

**Environment**
- OS: Ubuntu 18.04.5 LTS
- GCC version: gcc 7.5.0
- binutils version: commit (7de7786bb7db5159fc8a7bfa3df72381ff16a38c) of master
branch on sourceware git
(https://sourceware.org/git/?p=binutils-gdb.git;a=tree;h=7de7786bb7db5159fc8a7bfa3df72381ff16a38c;hb=7de7786bb7db5159fc8a7bfa3df72381ff16a38c)

Thank you.

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