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Fri, 27 Nov 2020 13:21:28 +0000 From: Szabolcs Nagy To: libc-alpha@sourceware.org Cc: Mark Rutland , Catalin Marinas , Will Deacon , linux-kernel@vger.kernel.org, Jeremy Linton , Mark Brown , kernel-hardening@lists.openwall.com, Topi Miettinen , linux-arm-kernel@lists.infradead.org Subject: [PATCH v2 5/6] elf: Pass the fd to note processing Date: Fri, 27 Nov 2020 13:21:15 +0000 Message-Id: X-Mailer: git-send-email 2.17.1 In-Reply-To: References: Content-Type: text/plain X-Originating-IP: [217.140.106.54] X-ClientProxiedBy: DM6PR01CA0018.prod.exchangelabs.com (2603:10b6:5:296::23) To PR3PR08MB5564.eurprd08.prod.outlook.com (2603:10a6:102:87::18) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost.localdomain (217.140.106.54) by DM6PR01CA0018.prod.exchangelabs.com (2603:10b6:5:296::23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3611.20 via Frontend Transport; Fri, 27 Nov 2020 13:21:25 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: 7d0cf905-7a8d-477f-cbdc-08d892d75e41 X-MS-TrafficTypeDiagnostic: PA4PR08MB6014:|AM0PR08MB3876: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: x-checkrecipientrouted: true NoDisclaimer: true X-MS-Oob-TLC-OOBClassifiers: OLM:9508;OLM:9508; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Nov 2020 13:21:36.8619 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7d0cf905-7a8d-477f-cbdc-08d892d75e41 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: VE1EUR03FT053.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR08MB3876 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org To handle GNU property notes on aarch64 some segments need to be mmaped again, so the fd of the loaded ELF module is needed. When the fd is not available (kernel loaded modules), then -1 is passed. The fd is passed to both _dl_process_pt_gnu_property and _dl_process_pt_note for consistency. Target specific note processing functions are updated accordingly. --- elf/dl-load.c | 12 +++++++----- elf/rtld.c | 4 ++-- sysdeps/aarch64/dl-prop.h | 6 +++--- sysdeps/generic/dl-prop.h | 6 +++--- sysdeps/generic/ldsodefs.h | 5 +++-- sysdeps/x86/dl-prop.h | 6 +++--- 6 files changed, 21 insertions(+), 18 deletions(-) diff --git a/elf/dl-load.c b/elf/dl-load.c index b0d65f32cc..74039f22a6 100644 --- a/elf/dl-load.c +++ b/elf/dl-load.c @@ -837,10 +837,12 @@ _dl_init_paths (const char *llp, const char *source) /* Process PT_GNU_PROPERTY program header PH in module L after PT_LOAD segments are mapped. Only one NT_GNU_PROPERTY_TYPE_0 - note is handled which contains processor specific properties. */ + note is handled which contains processor specific properties. + FD is -1 for the kernel mapped main executable otherwise it is + the fd used for loading module L. */ void -_dl_process_pt_gnu_property (struct link_map *l, const ElfW(Phdr) *ph) +_dl_process_pt_gnu_property (struct link_map *l, int fd, const ElfW(Phdr) *ph) { const ElfW(Nhdr) *note = (const void *) (ph->p_vaddr + l->l_addr); const ElfW(Addr) size = ph->p_memsz; @@ -887,7 +889,7 @@ _dl_process_pt_gnu_property (struct link_map *l, const ElfW(Phdr) *ph) last_type = type; /* Target specific property processing. */ - if (_dl_process_gnu_property (l, type, datasz, ptr) == 0) + if (_dl_process_gnu_property (l, fd, type, datasz, ptr) == 0) return; /* Check the next property item. */ @@ -1379,10 +1381,10 @@ cannot enable executable stack as shared object requires"); switch (ph[-1].p_type) { case PT_NOTE: - _dl_process_pt_note (l, &ph[-1]); + _dl_process_pt_note (l, fd, &ph[-1]); break; case PT_GNU_PROPERTY: - _dl_process_pt_gnu_property (l, &ph[-1]); + _dl_process_pt_gnu_property (l, fd, &ph[-1]); break; } diff --git a/elf/rtld.c b/elf/rtld.c index c4ffc8d4b7..ec62567580 100644 --- a/elf/rtld.c +++ b/elf/rtld.c @@ -1540,10 +1540,10 @@ dl_main (const ElfW(Phdr) *phdr, switch (ph[-1].p_type) { case PT_NOTE: - _dl_process_pt_note (main_map, &ph[-1]); + _dl_process_pt_note (main_map, -1, &ph[-1]); break; case PT_GNU_PROPERTY: - _dl_process_pt_gnu_property (main_map, &ph[-1]); + _dl_process_pt_gnu_property (main_map, -1, &ph[-1]); break; } diff --git a/sysdeps/aarch64/dl-prop.h b/sysdeps/aarch64/dl-prop.h index b0785bda83..2016d1472e 100644 --- a/sysdeps/aarch64/dl-prop.h +++ b/sysdeps/aarch64/dl-prop.h @@ -35,13 +35,13 @@ _dl_open_check (struct link_map *m) } static inline void __attribute__ ((always_inline)) -_dl_process_pt_note (struct link_map *l, const ElfW(Phdr) *ph) +_dl_process_pt_note (struct link_map *l, int fd, const ElfW(Phdr) *ph) { } static inline int -_dl_process_gnu_property (struct link_map *l, uint32_t type, uint32_t datasz, - void *data) +_dl_process_gnu_property (struct link_map *l, int fd, uint32_t type, + uint32_t datasz, void *data) { if (type == GNU_PROPERTY_AARCH64_FEATURE_1_AND) { diff --git a/sysdeps/generic/dl-prop.h b/sysdeps/generic/dl-prop.h index f1cf576fe3..df27ff8e6a 100644 --- a/sysdeps/generic/dl-prop.h +++ b/sysdeps/generic/dl-prop.h @@ -37,15 +37,15 @@ _dl_open_check (struct link_map *m) } static inline void __attribute__ ((always_inline)) -_dl_process_pt_note (struct link_map *l, const ElfW(Phdr) *ph) +_dl_process_pt_note (struct link_map *l, int fd, const ElfW(Phdr) *ph) { } /* Called for each property in the NT_GNU_PROPERTY_TYPE_0 note of L, processing of the properties continues until this returns 0. */ static inline int __attribute__ ((always_inline)) -_dl_process_gnu_property (struct link_map *l, uint32_t type, uint32_t datasz, - void *data) +_dl_process_gnu_property (struct link_map *l, int fd, uint32_t type, + uint32_t datasz, void *data) { return 0; } diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h index b1da03cafe..89eab4719d 100644 --- a/sysdeps/generic/ldsodefs.h +++ b/sysdeps/generic/ldsodefs.h @@ -933,8 +933,9 @@ extern void _dl_rtld_di_serinfo (struct link_map *loader, Dl_serinfo *si, bool counting); /* Process PT_GNU_PROPERTY program header PH in module L after - PT_LOAD segments are mapped. */ -void _dl_process_pt_gnu_property (struct link_map *l, const ElfW(Phdr) *ph); + PT_LOAD segments are mapped from file FD. */ +void _dl_process_pt_gnu_property (struct link_map *l, int fd, + const ElfW(Phdr) *ph); /* Search loaded objects' symbol tables for a definition of the symbol diff --git a/sysdeps/x86/dl-prop.h b/sysdeps/x86/dl-prop.h index 89911e19e2..4eb3b85a7b 100644 --- a/sysdeps/x86/dl-prop.h +++ b/sysdeps/x86/dl-prop.h @@ -145,15 +145,15 @@ _dl_process_cet_property_note (struct link_map *l, } static inline void __attribute__ ((unused)) -_dl_process_pt_note (struct link_map *l, const ElfW(Phdr) *ph) +_dl_process_pt_note (struct link_map *l, int fd, const ElfW(Phdr) *ph) { const ElfW(Nhdr) *note = (const void *) (ph->p_vaddr + l->l_addr); _dl_process_cet_property_note (l, note, ph->p_memsz, ph->p_align); } static inline int __attribute__ ((always_inline)) -_dl_process_gnu_property (struct link_map *l, uint32_t type, uint32_t datasz, - void *data) +_dl_process_gnu_property (struct link_map *l, int fd, uint32_t type, + uint32_t datasz, void *data) { return 0; } -- 2.17.1