[Bug demangler/102130] New: [c++filt] Stack overflow in demangle_path

[Bug demangler/102130] New: [c++filt] Stack overflow in demangle_path

[irfanariq at kaist dot ac.kr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102130

            Bug ID: 102130
           Summary: [c++filt] Stack overflow in demangle_path
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: demangler
          Assignee: unassigned at gcc dot gnu.org
          Reporter: irfanariq at kaist dot ac.kr
  Target Milestone: ---

Created attachment 51378
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51378&action=edit
poc and full stack trace

Hello,

We are currently working on fuzz testing feature, and we found a crash on
c++filt.

The stack traces are as follow:
==617==ERROR: AddressSanitizer: stack-overflow on address 0x7fffe1fa7ff8 (pc
0x555911cd5385 bp 0x7fffe1fa8140 sp 0x7fffe1fa8000 T0)
    #0 0x555911cd5384 in demangle_path rust-demangle.c:674
    #1 0x555911cd5e48 in demangle_path rust-demangle.c:774
    #2 0x555911cd56a1 in demangle_path rust-demangle.c:696
    #3 0x555911cd5e48 in demangle_path rust-demangle.c:774
    #4 0x555911cd56a1 in demangle_path rust-demangle.c:696
    ...
    #247 0x555911cd5e48 in demangle_path rust-demangle.c:774
    #248 0x555911cd56a1 in demangle_path rust-demangle.c:696
    #249 0x555911cd5e48 in demangle_path rust-demangle.c:774
    #250 0x555911cd56a1 in demangle_path rust-demangle.c:696
We also attach the full stack trace in the attachment.

**Step to reproduce**

We configured c++filt using 

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

,and built it using 

$ make -j10; make install 

,and run it with:

$ ./c++filt @<input file>

The input file is in the attachment.

**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.

[Bug demangler/102130] [c++filt] Stack overflow in demangle_path

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102130

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |MOVED
            Version|unknown                     |7.5.0

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Note binutils has a separate bugzilla at https://sourceware.org/bugzilla/ - the
GCC version stated is no longer supported and c++filt is part of binutils. 
Please file a bug in the appropriate bugzilla.

[Bug demangler/102130] [c++filt] Stack overflow in demangle_path

[irfanariq at kaist dot ac.kr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102130

--- Comment #2 from Irfan Ariq <irfanariq at kaist dot ac.kr> ---
Okay I will move it to the sourceware bugzilla. Thank you.

[Bug demangler/102130] [c++filt] Stack overflow in demangle_path

[amodra at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102130

Alan Modra <amodra at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
   Last reconfirmed|                            |2021-09-05
         Resolution|MOVED                       |---
     Ever confirmed|0                           |1
            Version|7.5.0                       |12.0
                 CC|                            |amodra at gmail dot com

--- Comment #3 from Alan Modra <amodra at gmail dot com> ---
Even though c++filt is binutils, the problem occurs in a libiberty file and in
rust-demangle.c as of 2021-08-30 in gcc master.  Moved back here.

[Bug demangler/102130] [c++filt] Stack overflow in demangle_path

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102130

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|---                         |DUPLICATE

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Dup of bug 98886.

*** This bug has been marked as a duplicate of bug 98886 ***