From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by sourceware.org (Postfix) with ESMTPS id 7485C3858C74 for ; Fri, 26 Aug 2022 12:49:40 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 7485C3858C74 Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=redhat.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1661518180; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=j5iAQnszgOSnABuprPyOoIhcnyAFLGLtsQgbLXXE5MY=; b=i/EmSruGx4CwwsxnSKQ1gbiCSOqtJ9AKjwPeGRdSAagThVfYO3NzBQP1L7mxfqbKqxXKy7 Xg/wSVpy4KVgqGrsb+hNWyrm2M9wBC/Ao3P56vqBPmwQ1dOkmd0vzv9tSWJrF97j8xqk9V jsR+Scq01dNY1k++FGo+5zdHMuDPhjY= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-410-6jKBu0DAPLigW4KbdLHsWA-1; Fri, 26 Aug 2022 08:49:39 -0400 X-MC-Unique: 6jKBu0DAPLigW4KbdLHsWA-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id E0C1F101A56D for ; Fri, 26 Aug 2022 12:49:38 +0000 (UTC) Received: from oldenburg.str.redhat.com (unknown [10.39.192.82]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 59D092166B26 for ; Fri, 26 Aug 2022 12:49:38 +0000 (UTC) From: Florian Weimer To: Florian Weimer via Libc-alpha Subject: Re: [PATCH] elf: Initialize libc_map to NULL on namespace creation References: <87mtbt5sxi.fsf@oldenburg.str.redhat.com> Date: Fri, 26 Aug 2022 14:49:36 +0200 In-Reply-To: <87mtbt5sxi.fsf@oldenburg.str.redhat.com> (Florian Weimer via Libc-alpha's message of "Wed, 24 Aug 2022 21:43:05 +0200") Message-ID: <87o7w7p3tr.fsf@oldenburg.str.redhat.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain X-Spam-Status: No, score=-4.7 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_NONE,TXREP,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: * Florian Weimer via Libc-alpha: > It seems that a stale libc_map value will be used (and not > overwritten) by a dlmopen after a dlclose that has deallocated > the namespace. This may not be visible easily because the libc > link map can be allocated at the same address. > > Fixes commit ec935dea6332cb22f9881cd1162bad156173f4b0 ("elf: > Implement __libc_early_init"). The new version is here: [PATCH] elf: Call __libc_early_init for reused namespaces (bug 29528) Thanks, Florian