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Fri, 3 Nov 2023 13:15:51 +0000 From: Szabolcs Nagy To: Subject: [PATCH 4/5] bfd: aarch64: Avoid BTI stub for a PLT that has BTI Date: Fri, 3 Nov 2023 13:15:50 +0000 Message-ID: X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-EOPAttributedMessage: 1 X-MS-TrafficTypeDiagnostic: DU2PEPF0001E9C6:EE_|AM8PR08MB6595:EE_|AMS0EPF00000198:EE_|AS8PR08MB6008:EE_ X-MS-Office365-Filtering-Correlation-Id: da05a163-fb6a-4351-3978-08dbdc6f0735 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:40.67.248.234;CTRY:IE;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:nebula.arm.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(4636009)(396003)(376002)(346002)(39860400002)(136003)(230922051799003)(64100799003)(451199024)(1800799009)(82310400011)(186009)(46966006)(40470700004)(36840700001)(2616005)(40460700003)(40480700001)(26005)(6916009)(36860700001)(336012)(7696005)(83380400001)(2906002)(47076005)(478600001)(426003)(5660300002)(70586007)(70206006)(44832011)(41300700001)(8936002)(316002)(8676002)(356005)(82740400003)(86362001)(81166007)(36756003)(36900700001);DIR:OUT;SFP:1101; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Nov 2023 13:16:02.2841 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: da05a163-fb6a-4351-3978-08dbdc6f0735 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: AMS0EPF00000198.eurprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR08MB6008 X-Spam-Status: No, score=-11.5 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,FORGED_SPF_HELO,GIT_PATCH_0,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=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: We decide to emit BTI stubs based on the instruction at the target location. But PLT code is generated later than the stubs so we always read 0 which is not a valid BTI. Fix the logic to special case the PLT section: this is code the linker generates so we know when it will have BTI. This avoids BTI stubs in large executables where the PLTs have them already. An alternative is to never emit BTI stubs for PLTs, instead use BTI in the PLT if a library gets too big, however that may be more tricky given the ordering of PLT sizing and stub insertion. Related to bug 30957. --- bfd/elfnn-aarch64.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) diff --git a/bfd/elfnn-aarch64.c b/bfd/elfnn-aarch64.c index 3adece30250..4faf642b422 100644 --- a/bfd/elfnn-aarch64.c +++ b/bfd/elfnn-aarch64.c @@ -3675,7 +3675,8 @@ group_sections (struct elf_aarch64_link_hash_table *htab, /* True if the inserted stub does not break BTI compatibility. */ static bool -aarch64_bti_stub_p (struct elf_aarch64_stub_hash_entry *stub_entry) +aarch64_bti_stub_p (struct bfd_link_info *info, + struct elf_aarch64_stub_hash_entry *stub_entry) { /* Stubs without indirect branch are BTI compatible. */ if (stub_entry->stub_type != aarch64_stub_adrp_branch @@ -3684,12 +3685,22 @@ aarch64_bti_stub_p (struct elf_aarch64_stub_hash_entry *stub_entry) /* Return true if the target instruction is compatible with BR x16. */ + struct elf_aarch64_link_hash_table *globals = elf_aarch64_hash_table (info); asection *section = stub_entry->target_section; bfd_byte loc[4]; file_ptr off = stub_entry->target_value; bfd_size_type count = sizeof (loc); - if (!bfd_get_section_contents (section->owner, section, loc, off, count)) + /* PLT code is not generated yet, so treat it specially. + Note: Checking elf_aarch64_obj_tdata.plt_type & PLT_BTI is not + enough because it only implies BTI in the PLT0 and tlsdesc PLT + entries. Normal PLT entries don't have BTI in a shared library + (because such PLT is normally not called indirectly and adding + the BTI when a stub targets a PLT would change the PLT layout + and it's too late for that here). */ + if (section == globals->root.splt) + memcpy (loc, globals->plt_entry, count); + else if (!bfd_get_section_contents (section->owner, section, loc, off, count)) return false; uint32_t insn = bfd_getl32 (loc); @@ -4636,7 +4647,7 @@ _bfd_aarch64_add_call_stub_entries (bool *stub_changed, bfd *output_bfd, /* A stub with indirect jump may break BTI compatibility, so insert another stub with direct jump near the target then. */ - if (need_bti && !aarch64_bti_stub_p (stub_entry)) + if (need_bti && !aarch64_bti_stub_p (info, stub_entry)) { id_sec_bti = htab->stub_group[sym_sec->id].link_sec; -- 2.25.1