From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
 id D1CD53846078; Tue,  6 Apr 2021 13:06:28 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org D1CD53846078
From: "nickc at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug demangler/99935] New: Stack exhaustion demangling rust mangled
 name
Date: Tue, 06 Apr 2021 13:06:28 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: demangler
X-Bugzilla-Version: 11.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: nickc at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status
 bug_severity priority component assigned_to reporter target_milestone
Message-ID: <bug-99935-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Tue, 06 Apr 2021 13:06:28 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99935

            Bug ID: 99935
           Summary: Stack exhaustion demangling rust mangled name
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: demangler
          Assignee: unassigned at gcc dot gnu.org
          Reporter: nickc at gcc dot gnu.org
  Target Milestone: ---

The rust demangler can be pushed into an infinite loop, triggering stack
exhaustion:

  %  cat pr27963
# Reproduced from binutils PR 27963.
# Note - the expected output is wrong.  It is just there as a placeholder.
--format=3Drust
_RIMBALO_suB_I__Z5printi
fred

  % valgrind ./testsuite/test-demangle < pr27963
[...]
=3D=3D429737=3D=3D Stack overflow in thread #1: can't grow stack to 0x1ffe0=
01000
[...]
=3D429737=3D=3D Stack overflow in thread #1: can't grow stack to 0x1ffe0010=
00
=3D=3D429737=3D=3D    at 0x410BA7: demangle_path (rust-demangle.c:742)
[...]
Segmentation fault (core dumped)=