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Lu" , GNU C Library Subject: Re: [PATCH 3/3] csu: Move static pie self relocation later [BZ #27072] Message-ID: <20210107152543.GR2379@arm.com> References: <1bfa01e6e92073b30c02cb76a209656b9d97b675.1610016590.git.szabolcs.nagy@arm.com> <6b00243a-dee5-83c5-411b-0ec987e9a877@redhat.com> <20210107130217.GN2379@arm.com> <20210107142530.GQ2379@arm.com> Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) X-Originating-IP: [217.140.106.51] X-ClientProxiedBy: LO2P265CA0462.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:a2::18) To PA4PR08MB6320.eurprd08.prod.outlook.com (2603:10a6:102:e5::9) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from arm.com (217.140.106.51) by LO2P265CA0462.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:a2::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3742.6 via Frontend Transport; Thu, 7 Jan 2021 15:25:46 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: c8093bdb-bc38-4f5f-2259-08d8b32085b1 X-MS-TrafficTypeDiagnostic: PAXPR08MB6574:|AM6PR08MB5046: X-Microsoft-Antispam-PRVS: x-checkrecipientrouted: true NoDisclaimer: true X-MS-Oob-TLC-OOBClassifiers: OLM:6790;OLM:6790; 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PTR:ec2-63-35-35-123.eu-west-1.compute.amazonaws.com; CAT:NONE; SFS:(4636009)(136003)(376002)(396003)(346002)(39860400002)(46966006)(36756003)(70206006)(4326008)(86362001)(2616005)(8936002)(55016002)(47076005)(44832011)(7696005)(70586007)(33656002)(53546011)(5660300002)(316002)(186003)(356005)(8676002)(4744005)(26005)(54906003)(1076003)(81166007)(8886007)(956004)(478600001)(82740400003)(34020700004)(6862004)(16526019)(82310400003)(336012)(2906002); DIR:OUT; SFP:1101; X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Jan 2021 15:25:53.6168 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c8093bdb-bc38-4f5f-2259-08d8b32085b1 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d; Ip=[63.35.35.123]; Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: DB5EUR03FT055.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM6PR08MB5046 X-Spam-Status: No, score=-7.8 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, MSGID_FROM_MTA_HEADER, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_PASS, SPF_PASS, TXREP, UNPARSEABLE_RELAY 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, 07 Jan 2021 15:25:57 -0000 The 01/07/2021 20:18, Siddhesh Poyarekar wrote: > On 1/7/21 7:55 PM, Szabolcs Nagy via Libc-alpha wrote: > > it still sounds like a big hack that relies on where > > IRELATIVE is placed with current linkers and that there > > are no other relocs we need to care about in static pie. > > i can create a patch to see if it works. > > This is probably a safe assumption for pointer based architectures but not > for those with capabilities. I have a feeling you might care about the > latter ;) well static pie is broken now, i care about that more. we don't know yet how capability relocs will work with static linking and ifuncs. but the main problem with this idea is that i have to copy a large part of the elf reloc code and hack it apart to do static pie relocation (and that code is not a nice piece of code in the first place).