From mboxrd@z Thu Jan  1 00:00:00 1970
X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/4724
Path: news.gmane.org!not-for-mail
From: Alexander Monakov <amonakov@ispras.ru>
Newsgroups: gmane.linux.lib.musl.general
Subject: Re: be able to break inheritance of LD_LIBRARY_PATH
Date: Fri, 28 Mar 2014 16:27:05 +0400 (MSK)
Message-ID: <alpine.LNX.2.00.1403281622350.18475@monopod.intra.ispras.ru>
References: <20140328104208.GZ8221@example.net>
Reply-To: musl@lists.openwall.com
NNTP-Posting-Host: plane.gmane.org
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Trace: ger.gmane.org 1396009631 13213 80.91.229.3 (28 Mar 2014 12:27:11 GMT)
X-Complaints-To: usenet@ger.gmane.org
NNTP-Posting-Date: Fri, 28 Mar 2014 12:27:11 +0000 (UTC)
To: musl@lists.openwall.com
Original-X-From: musl-return-4728-gllmg-musl=m.gmane.org@lists.openwall.com Fri Mar 28 13:27:21 2014
Return-path: <musl-return-4728-gllmg-musl=m.gmane.org@lists.openwall.com>
Envelope-to: gllmg-musl@plane.gmane.org
Original-Received: from mother.openwall.net ([195.42.179.200])
	by plane.gmane.org with smtp (Exim 4.69)
	(envelope-from <musl-return-4728-gllmg-musl=m.gmane.org@lists.openwall.com>)
	id 1WTVsV-0005Sh-Of
	for gllmg-musl@plane.gmane.org; Fri, 28 Mar 2014 13:27:19 +0100
Original-Received: (qmail 24093 invoked by uid 550); 28 Mar 2014 12:27:19 -0000
Mailing-List: contact musl-help@lists.openwall.com; run by ezmlm
Precedence: bulk
List-Post: <mailto:musl@lists.openwall.com>
List-Help: <mailto:musl-help@lists.openwall.com>
List-Unsubscribe: <mailto:musl-unsubscribe@lists.openwall.com>
List-Subscribe: <mailto:musl-subscribe@lists.openwall.com>
Original-Received: (qmail 24083 invoked from network); 28 Mar 2014 12:27:19 -0000
In-Reply-To: <20140328104208.GZ8221@example.net>
User-Agent: Alpine 2.00 (LNX 1167 2008-08-23)
Xref: news.gmane.org gmane.linux.lib.musl.general:4724
Archived-At: <http://permalink.gmane.org/gmane.linux.lib.musl.general/4724>

Instead of patching the dynamic loader, you can supply an LD_PRELOAD module
that would remove/modify LD_LIBRARY_PATH appropriately at startup:

#include <stdlib.h>

void __attribute__((constructor))
remove_ld_l_p(void)
{
  unsetenv("LD_LIBRARY_PATH");
  unsetenv("LD_PRELOAD");
}


HTH.
Alexander