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Fri, 15 May 2020 14:41:06 +0000 From: Szabolcs Nagy To: libc-alpha@sourceware.org Subject: [PATCH v3 08/13] aarch64: fix RTLD_START for BTI Date: Fri, 15 May 2020 15:40:52 +0100 Message-Id: <907a683ba82f7b14e24ff38dfa5c74f056275d3f.1589552055.git.szabolcs.nagy@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: References: X-ClientProxiedBy: LO2P265CA0309.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:a5::33) To AM6PR08MB3047.eurprd08.prod.outlook.com (2603:10a6:209:4c::23) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost.localdomain (217.140.106.55) by LO2P265CA0309.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:a5::33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3000.24 via Frontend Transport; Fri, 15 May 2020 14:41:06 +0000 X-Mailer: git-send-email 2.17.1 X-Originating-IP: [217.140.106.55] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: 932b9dc6-4bac-49af-ce6d-08d7f8de040b X-MS-TrafficTypeDiagnostic: AM6PR08MB4454:|AM5PR0801MB1713: X-Microsoft-Antispam-PRVS: x-checkrecipientrouted: true NoDisclaimer: true X-MS-Oob-TLC-OOBClassifiers: OLM:9508;OLM:9508; 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Ip=[63.35.35.123]; Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM5PR0801MB1713 X-Spam-Status: No, score=-19.5 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, GIT_PATCH_0, MSGID_FROM_MTA_HEADER, RCVD_IN_DNSWL_LOW, 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: , Errors-To: libc-alpha-bounces@sourceware.org Sender: "Libc-alpha" Tailcalls must use x16 or x17 for the indirect branch instruction to be compatible with code that uses BTI c at function entries. (Other forms of indirect branches can only land on BTI j.) Also added a BTI c at the ELF entry point of rtld, this is not strictly necessary since the kernel does not use indirect branch to get there, but it seems safest once building glibc itself with BTI is supported. Reviewed-by: Adhemerval Zanella --- sysdeps/aarch64/dl-machine.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/sysdeps/aarch64/dl-machine.h b/sysdeps/aarch64/dl-machine.h index db3335e5ad..70b9ed3925 100644 --- a/sysdeps/aarch64/dl-machine.h +++ b/sysdeps/aarch64/dl-machine.h @@ -125,6 +125,8 @@ elf_machine_runtime_setup (struct link_map *l, int lazy, int profile) .globl _dl_start_user \n\ .type _dl_start_user, %function \n\ _start: \n\ + // bti c \n\ + hint 34 \n\ mov " PTR "0, " PTR_SP " \n\ bl _dl_start \n\ // returns user entry point in x0 \n\ @@ -178,7 +180,8 @@ _dl_start_user: \n\ adrp x0, _dl_fini \n\ add " PTR "0, " PTR "0, #:lo12:_dl_fini \n\ // jump to the user_s entry point \n\ - br x21 \n\ + mov x16, x21 \n\ + br x16 \n\ "); #define elf_machine_type_class(type) \