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Mon, 29 Aug 2022 11:49:51 +0000 From: Wilco Dijkstra To: "H.J. Lu" , Richard Henderson CC: Adhemerval Zanella , GNU C Library Subject: Re: [RESEND PATCH] Makeconfig: Set pie-ccflag to -fPIE by default Thread-Topic: [RESEND PATCH] Makeconfig: Set pie-ccflag to -fPIE by default Thread-Index: AQHYuXiUB+0tpuwABE6GkvDoDcBwdK3BifSAgAAL3YCAAAdrAIAEJe3/ Date: Mon, 29 Aug 2022 11:49:51 +0000 Message-ID: References: <10cbed26-dc3c-3a55-8e39-95916c614dbb@linaro.org> In-Reply-To: Accept-Language: en-GB, en-US Content-Language: en-GB X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: Authentication-Results-Original: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=arm.com; X-MS-Office365-Filtering-Correlation-Id: eded7d9e-cca7-4bfe-10a5-08da89b49a26 x-ms-traffictypediagnostic: DB6PR0801MB1814:EE_|DBAEUR03FT064:EE_|VE1PR08MB4813:EE_ x-checkrecipientrouted: true nodisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0; X-Microsoft-Antispam-Message-Info-Original: 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 X-Forefront-Antispam-Report-Untrusted: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:AS4PR08MB7901.eurprd08.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230016)(4636009)(376002)(396003)(346002)(136003)(366004)(39860400002)(9686003)(7696005)(38070700005)(6506007)(33656002)(86362001)(186003)(41300700001)(71200400001)(26005)(478600001)(55016003)(66476007)(76116006)(64756008)(8676002)(91956017)(54906003)(316002)(4326008)(66446008)(38100700002)(52536014)(8936002)(66946007)(66556008)(122000001)(110136005)(5660300002)(4744005)(2906002);DIR:OUT;SFP:1101; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Aug 2022 11:49:59.9494 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: eded7d9e-cca7-4bfe-10a5-08da89b49a26 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: DBAEUR03FT064.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: VE1PR08MB4813 X-Spam-Status: No, score=-5.2 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,FORGED_SPF_HELO,KAM_DMARC_NONE,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE,TXREP,T_SCC_BODY_TEXT_LINE,UNPARSEABLE_RELAY autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: Hi,=0A= =0A= It's obviously a bug in the way BUILD_PIE_DEFAULT is implemented.=0A= For example one issue is in include/libc-symbols.h:=0A= =0A= #if defined SHARED || defined LIBC_NONSHARED \=0A= || (BUILD_PIE_DEFAULT && IS_IN (libc))=0A= =0A= That should be something like && !IS_IN (nscd) - that builds and removes=0A= a bunch of GOT indirections.=0A= =0A= There is a similar issue with special symbol handling, particularly for=0A= __libc_single_threaded.=0A= =0A= However this leads to the question is why aren't all symbols marked as hidd= en=0A= in the static PIE build? Ie. are there any symbols that must be shared with= a DSO =0A= loaded by a dl_open?=0A= =0A= Cheers,=0A= Wilco=