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 2D08E3857814 for ; Fri, 19 Nov 2021 15:30:37 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 2D08E3857814 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-484--T2tvVE9POSd43wof4urzA-1; Fri, 19 Nov 2021 10:30:35 -0500 X-MC-Unique: -T2tvVE9POSd43wof4urzA-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 B20EC80A5CD; Fri, 19 Nov 2021 15:30:34 +0000 (UTC) Received: from oldenburg.str.redhat.com (unknown [10.39.192.131]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 53D96101E814; Fri, 19 Nov 2021 15:30:33 +0000 (UTC) From: Florian Weimer To: "H.J. Lu" Cc: libc-alpha@sourceware.org, Adhemerval Zanella Subject: Re: [PATCH] Add GLIBC_PRIVATE_RELR as proxy for DT_RELR References: <20211119152655.121201-1-hjl.tools@gmail.com> Date: Fri, 19 Nov 2021 16:30:31 +0100 In-Reply-To: <20211119152655.121201-1-hjl.tools@gmail.com> (H. J. Lu's message of "Fri, 19 Nov 2021 07:26:55 -0800") Message-ID: <87zgq0b1t4.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 2.84 on 10.5.11.22 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain X-Spam-Status: No, score=-6.6 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, RCVD_IN_DNSWL_LOW, RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, SPF_NONE, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) 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: Fri, 19 Nov 2021 15:30:38 -0000 * H. J. Lu: > Executables with DT_RELR will crash mysteriously with glibc binaries > without DT_RELR support. Bump EI_ABIVERSION won't prevent crash since > the Linux kernel loader doesn't check EI_ABIVERSION on executables. > Adding a glibc version dependency on the first glibc version with > DT_RELR support will prevent backporting DT_RELR support to released > glibc branches. > > Add a GLIBC_PRIVATE_RELR version as a proxy for DT_RELR support in glibc. > Linker should add the GLIBC_PRIVATE_RELR version dependency on binaries > with DT_RELR. GLIBC_PRIVATE_RELR should be backported together when > backporting DT_RELR support. I don't like it. What's wrong about EI_ABIVERSION? The kernel doesn't need to check EI_ABIVERSION because it does not do relocation processing. Thanks, Florian