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 [216.205.24.124]) by sourceware.org (Postfix) with ESMTP id 742AD3857C65 for ; Thu, 24 Sep 2020 11:10:18 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 742AD3857C65 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-591-wFYte430MR6HKICqfjKvKg-1; Thu, 24 Sep 2020 07:10:16 -0400 X-MC-Unique: wFYte430MR6HKICqfjKvKg-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 86D7F81C463; Thu, 24 Sep 2020 11:10:15 +0000 (UTC) Received: from oldenburg2.str.redhat.com (ovpn-114-84.ams2.redhat.com [10.36.114.84]) by smtp.corp.redhat.com (Postfix) with ESMTPS id C8938100239F; Thu, 24 Sep 2020 11:10:14 +0000 (UTC) From: Florian Weimer To: Szabolcs Nagy Cc: Ben Woodard via Libc-alpha Subject: Re: [PATCH] Fix runtime linker auditing on aarch64 References: <20200923011613.2243151-1-woodard@redhat.com> <87d02cr8bp.fsf@oldenburg2.str.redhat.com> <20200923124848.GE16385@arm.com> <87r1qsps6i.fsf@oldenburg2.str.redhat.com> <20200923131813.GF16385@arm.com> Date: Thu, 24 Sep 2020 13:10:13 +0200 In-Reply-To: <20200923131813.GF16385@arm.com> (Szabolcs Nagy's message of "Wed, 23 Sep 2020 14:18:13 +0100") Message-ID: <87y2kzl9be.fsf@oldenburg2.str.redhat.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain X-Spam-Status: No, score=-6.8 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, KAM_NUMSUBJECT, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H5, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 24 Sep 2020 11:10:19 -0000 * Szabolcs Nagy: > we don't have a way to do this in the architecture > (i.e. reg state save/restore operations) > we can have something in the kernel (which needs > to know about the supported registers) but i > assume using a syscall for this is too much overhead. Yes, seems like a system call would be problematic. > (maybe in vdso? sounds ugly if we need it before > vdso is set up) Indeed. If AArch64 doesn't have a generic mechanism, that certainly simplifies matters because there's no dynamic linker alignment to the hardware needed then. Thanks, Florian -- Red Hat GmbH, https://de.redhat.com/ , Registered seat: Grasbrunn, Commercial register: Amtsgericht Muenchen, HRB 153243, Managing Directors: Charles Cachera, Brian Klemm, Laurie Krebs, Michael O'Neill