X-Recipient: archive-cygwin@delorie.com X-Spam-Check-By: sourceware.org Message-ID: <47D7FDDB.73ABB705@dessent.net> Date: Wed, 12 Mar 2008 08:59:23 -0700 From: Brian Dessent X-Mailer: Mozilla 4.79 [en] (Windows NT 5.0; U) MIME-Version: 1.0 To: cygwin@cygwin.com Subject: Re: Bug: C-prog from Win dies in fork; gdb.exe also won't run References: <47D4A7E4.5070509@tlinx.org> <47D4B7D2.1F78DADB@dessent.net> <47D4E892.1090305@tlinx.org> <47D50BB6.EFB28302@dessent.net> <47D6056B.6000805@tlinx.org> <47D610C2.EECE7EE9@dessent.net> <00b601c8843a$d94fe2c0$2708a8c0@CAM.ARTIMI.COM> <47D7EFEC.122C76AE@dessent.net> <00d001c88456$9f75a3c0$2708a8c0@CAM.ARTIMI.COM> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-IsSubscribed: yes Reply-To: cygwin@cygwin.com Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Delivered-To: mailing list cygwin@cygwin.com Dave Korn wrote: > Now, who supposes you could work around the restriction by writing > > * (WORD *) 0x004000dc = POSIX_CUI; > > just before calling NtSetInformation? How are you going to fool the executive by poking around in the PE header from userspace long after the process has initialized? The executive fundamentally knows which subsystem any given process is running in because it created it and manages the low level process table. That's not to say that you couldn't install a kernel driver that somehow munges bits of the executive's internal datastructures to allow this, but sweet mother of sh*t do I not want to have the job of the person responsible for maintaining *that*. Brian -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/