From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 26035 invoked by alias); 23 Aug 2012 12:01:24 -0000 Received: (qmail 26025 invoked by uid 22791); 23 Aug 2012 12:01:23 -0000 X-SWARE-Spam-Status: No, hits=-3.8 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00,KHOP_THREADED X-Spam-Check-By: sourceware.org Received: from localhost (HELO sourceware.org) (127.0.0.1) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Thu, 23 Aug 2012 12:01:07 +0000 From: "bugdal at aerifal dot cx" To: glibc-bugs@sources.redhat.com Subject: [Bug dynamic-link/14511] dlclose DSO unloading fundamentally unsafe Date: Thu, 23 Aug 2012 12:01:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: glibc X-Bugzilla-Component: dynamic-link X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: bugdal at aerifal dot cx X-Bugzilla-Status: REOPENED X-Bugzilla-Priority: P2 X-Bugzilla-Assigned-To: unassigned at sourceware dot org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Changed-Fields: Status Resolution Message-ID: In-Reply-To: References: X-Bugzilla-URL: http://sourceware.org/bugzilla/ Auto-Submitted: auto-generated Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 Mailing-List: contact glibc-bugs-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Post: List-Help: , Sender: glibc-bugs-owner@sourceware.org X-SW-Source: 2012-08/txt/msg00167.txt.bz2 http://sourceware.org/bugzilla/show_bug.cgi?id=14511 Rich Felker changed: What |Removed |Added ---------------------------------------------------------------------------- Status|RESOLVED |REOPENED Resolution|INVALID | --- Comment #6 from Rich Felker 2012-08-23 12:00:37 UTC --- Add an extra level of libraries then. For example, consider myplugin.so that depends on libbar.so which depends on libfoo.so. If myplugin.so is designed to be unload-safe, but libbar.so isn't, the application has no way of knowing it's unsafe to call dlclose on myplugin.so. I agree DF_1_NODELETE/-Wl,-z,nodelete is part of the fix, but the default is backwards. A library is not safely unloadable by default. It's only safely unloadable if it was explicitly designed to be. Perhaps if libtool added -Wl,-z,nodelete by default except when configured not to, that would solve the problem... -- Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.