From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <sourceware-bugzilla@sourceware.org>
Received: by sourceware.org (Postfix, from userid 48)
 id 44980385840C; Wed, 10 Nov 2021 14:11:37 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 44980385840C
From: "bryanmcsp at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug remote/26614] AddressSanitizer: heap-use-after-free of
 extended_remote_target in remote_async_inferior_event_handler
Date: Wed, 10 Nov 2021 14:11:36 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gdb
X-Bugzilla-Component: remote
X-Bugzilla-Version: HEAD
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: bryanmcsp at gmail dot com
X-Bugzilla-Status: RESOLVED
X-Bugzilla-Resolution: FIXED
X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: unassigned at sourceware dot org
X-Bugzilla-Target-Milestone: 10.2
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: cc
Message-ID: <bug-26614-4717-t7gsGKwkjE@http.sourceware.org/bugzilla/>
In-Reply-To: <bug-26614-4717@http.sourceware.org/bugzilla/>
References: <bug-26614-4717@http.sourceware.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://sourceware.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: gdb-prs@sourceware.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gdb-prs mailing list <gdb-prs.sourceware.org>
List-Unsubscribe: <https://sourceware.org/mailman/options/gdb-prs>,
 <mailto:gdb-prs-request@sourceware.org?subject=unsubscribe>
List-Archive: <https://sourceware.org/pipermail/gdb-prs/>
List-Help: <mailto:gdb-prs-request@sourceware.org?subject=help>
List-Subscribe: <https://sourceware.org/mailman/listinfo/gdb-prs>,
 <mailto:gdb-prs-request@sourceware.org?subject=subscribe>
X-List-Received-Date: Wed, 10 Nov 2021 14:11:37 -0000

https://sourceware.org/bugzilla/show_bug.cgi?id=3D26614

Takkelink <bryanmcsp at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bryanmcsp at gmail dot com

--- Comment #46 from Takkelink <bryanmcsp at gmail dot com> ---
The problem is here in remote_async_inferior_event_handler:
    ...
    static void
    remote_async_inferior_event_handler (gdb_client_data data)
    {
      inferior_event_handler (INF_REG_EVENT);

      remote_target *remote =3D (remote_target *) data;
      remote_state *rs =3D remote->get_remote_state ();
    ...

    The remote target (passed in the data argument) can be destroyed during=
 the
    call to inferior_event_handler.  If so, the call to
remote->get_remote_state
    () is done using a dangling pointer.

    Fix this by increasing the reference count on the remote target before
calling
    inferior_event_handler, such that it won't get destroyed until right be=
fore
    returning from remote_async_inferior_event_handler.
    https://www.blfplumber.com


    Tested on x86_64-linux.

    Intended for gdb-10-branch.

    The problem has stopped reproducing with the trigger patch since master
commit
    79952e69634 "Make scoped_restore_current_thread's cdtors exception free
    (RFC)".  We could still apply this to master though.

    gdb/ChangeLog:

--=20
You are receiving this mail because:
You are on the CC list for the bug.=