Mailing-List:	contact cygwin-developers-help AT sourceware DOT cygnus DOT com; run by ezmlm
List-Subscribe:	<mailto:cygwin-developers-subscribe AT sources DOT redhat DOT com>
List-Archive:	<http://sources.redhat.com/ml/cygwin-developers/>
List-Post:	<mailto:cygwin-developers AT sources DOT redhat DOT com>
List-Help:	<mailto:cygwin-developers-help AT sources DOT redhat DOT com>, <http://sources.redhat.com/ml/#faqs>
Sender:	cygwin-developers-owner AT sources DOT redhat DOT com
Delivered-To:	mailing list cygwin-developers AT sources DOT redhat DOT com
Date:	Wed, 18 Apr 2001 15:23:17 +0400
From:	egor duda <deo AT logos-m DOT ru>
X-Mailer:	The Bat! (v1.45) Personal
Reply-To:	egor duda <cygwin-developers AT cygwin DOT com>
Organization:	deo
X-Priority:	3 (Normal)
Message-ID:	<123329292477.20010418152317@logos-m.ru>
To:	"Robert Collins" <robert DOT collins AT itdomain DOT com DOT au>
CC:	cygwin-developers AT cygwin DOT com
Subject:	Re: handle protection - please comment
In-reply-To:	<00ba01c0c7f6$530ac1b0$0200a8c0@lifelesswks>
References:	<EA18B9FA0FE4194AA2B4CDB91F73C0EF79C2 AT itdomain002 DOT itdomain DOT net DOT au>
	<20010418120530 DOT Q15962 AT cygbert DOT vinschen DOT de>
	<00a401c0c7f0$02bb1f30$0200a8c0 AT lifelesswks>
	<13327115627 DOT 20010418144700 AT logos-m DOT ru>
	<00ba01c0c7f6$530ac1b0$0200a8c0 AT lifelesswks>
Mime-Version:	1.0

Hi!

Wednesday, 18 April, 2001 Robert Collins robert DOT collins AT itdomain DOT com DOT au wrote:

>> If you can suggest any other way to pass handles from process A (run
>> by user User1) to process B (run by user User2) without having server
>> run by administrator, it would be great.

RC> Place them in a a list in a shared memory area. That is essentially what
RC> kernels do. No process memory access is needed.

They _are_ in shared memory area already. Passing handle value (via
shared memory area or by other means) from process A to process B is
_not_ enough to use it in process B. win32 handles _must_ be
duplicated after they were passed from one process to another.

i know only 2 things in win32 api which allow using a handle from one
process in another -- either inheritance or DuplicateHandle(). If you
know some other way, it'd be nice to see the proof-of-concept code.

Egor.            mailto:deo AT logos-m DOT ru ICQ 5165414 FidoNet 2:5020/496.19

- Raw text -