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Wed, 8 Mar 2023 19:04:25 +0000 From: Joey Gouly To: Andrew Morton CC: , , , , , , , , Shuah Khan , Kees Cook Subject: [PATCH v1 1/4] mm: deduplicate error handling for map_deny_write_exec Date: Wed, 8 Mar 2023 19:04:20 +0000 Message-ID: <20230308190423.46491-2-joey.gouly@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230308190423.46491-1-joey.gouly@arm.com> References: <20230308190423.46491-1-joey.gouly@arm.com> MIME-Version: 1.0 X-EOPAttributedMessage: 1 X-MS-TrafficTypeDiagnostic: VI1EUR03FT019:EE_|AM7PR08MB5365:EE_|DBAEUR03FT053:EE_|AS2PR08MB9221:EE_ X-MS-Office365-Filtering-Correlation-Id: 73fa76ca-11bb-458d-7899-08db20080b21 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:(13230025)(4636009)(136003)(376002)(346002)(39860400002)(396003)(451199018)(46966006)(36840700001)(426003)(336012)(47076005)(316002)(54906003)(36756003)(40480700001)(86362001)(81166007)(356005)(36860700001)(83380400001)(82310400005)(26005)(1076003)(2616005)(82740400003)(186003)(6666004)(44832011)(5660300002)(7696005)(478600001)(8936002)(966005)(41300700001)(4326008)(70206006)(2906002)(70586007)(8676002)(6916009)(36900700001);DIR:OUT;SFP:1101; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Mar 2023 19:05:12.1627 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 73fa76ca-11bb-458d-7899-08db20080b21 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: DBAEUR03FT053.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS2PR08MB9221 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Commit cc8d1b097de7 ("mmap: clean up mmap_region() unrolling") deduplicated the error handling, do the same for the return value of `map_deny_write_exe= c`. Fixes: b507808ebce2 ("mm: implement memory-deny-write-execute as a prctl") Reported-by: Alexey Izbyshev Link: https://lore.kernel.org/linux-arm-kernel/8408d8901e9d7ee6b78db4c6cba0= 4b78@ispras.ru/ Signed-off-by: Joey Gouly Cc: Catalin Marinas Cc: Andrew Morton Reviewed-by: Catalin Marinas --- mm/mmap.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) diff --git a/mm/mmap.c b/mm/mmap.c index 740b54be3ed4..ad499f7b767f 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2621,12 +2621,7 @@ unsigned long mmap_region(struct file *file, unsigne= d long addr, =20 if (map_deny_write_exec(vma, vma->vm_flags)) { error =3D -EACCES; - if (file) - goto close_and_free_vma; - else if (vma->vm_file) - goto unmap_and_free_vma; - else - goto free_vma; + goto close_and_free_vma; } =20 /* Allow architectures to sanity-check the vm_flags */ --=20 2.17.1 From nobody Sun Feb 8 21:58:02 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C3C89C678D5 for ; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Mar 2023 19:05:27.3610 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: add10388-0e19-458c-db7c-08db2008143e 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: VI1EUR03FT005.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: GV1PR08MB8378 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Commit 4a18419f71cd ("mm/mprotect: use mmu_gather") changed 'goto out;' to 'break' in the loop. This wasn't noticed while rebasing the MDWE patches, so fix it now. Fixes: b507808ebce2 ("mm: implement memory-deny-write-execute as a prctl") Reported-by: Alexey Izbyshev Link: https://lore.kernel.org/linux-arm-kernel/8408d8901e9d7ee6b78db4c6cba0= 4b78@ispras.ru/ Signed-off-by: Joey Gouly Cc: Catalin Marinas Cc: Andrew Morton Reviewed-by: Catalin Marinas --- mm/mprotect.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/mprotect.c b/mm/mprotect.c index 231929f119d9..13e84d8c0797 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -805,7 +805,7 @@ static int do_mprotect_pkey(unsigned long start, size_t= len, =20 if (map_deny_write_exec(vma, newflags)) { error =3D -EACCES; - goto out; + break; } =20 /* Allow architectures to sanity-check the new flags */ --=20 2.17.1 From nobody Sun Feb 8 21:58:02 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DDECEC64EC4 for ; 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Wed, 8 Mar 2023 19:04:26 +0000 From: Joey Gouly To: Andrew Morton CC: , , , , , , , , Shuah Khan , Kees Cook Subject: [PATCH v1 3/4] kselftest: vm: fix unused variable warning Date: Wed, 8 Mar 2023 19:04:22 +0000 Message-ID: <20230308190423.46491-4-joey.gouly@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230308190423.46491-1-joey.gouly@arm.com> References: <20230308190423.46491-1-joey.gouly@arm.com> MIME-Version: 1.0 X-EOPAttributedMessage: 1 X-MS-TrafficTypeDiagnostic: VI1EUR03FT055:EE_|AS2PR08MB9737:EE_|VI1EUR03FT009:EE_|PR3PR08MB5674:EE_ X-MS-Office365-Filtering-Correlation-Id: c5b46b0f-a758-43e9-6509-08db200810ef 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:(13230025)(4636009)(39860400002)(376002)(136003)(346002)(396003)(451199018)(40470700004)(36840700001)(46966006)(4744005)(8936002)(54906003)(44832011)(5660300002)(70586007)(6916009)(70206006)(8676002)(4326008)(2906002)(316002)(478600001)(7696005)(36860700001)(47076005)(36756003)(426003)(6666004)(1076003)(83380400001)(41300700001)(86362001)(26005)(2616005)(82740400003)(81166007)(40460700003)(82310400005)(356005)(336012)(186003)(40480700001)(36900700001);DIR:OUT;SFP:1101; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Mar 2023 19:05:21.7915 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c5b46b0f-a758-43e9-6509-08db200810ef 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: VI1EUR03FT009.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PR3PR08MB5674 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Peter Xu Remove unused variable from the MDWE test. Fixes: 4cf1fe34fd18 ("kselftest: vm: add tests for memory-deny-write-execut= e") Signed-off-by: Peter Xu [joey: added commit message] Signed-off-by: Joey Gouly Cc: Catalin Marinas Cc: Andrew Morton Acked-by: Catalin Marinas --- tools/testing/selftests/mm/mdwe_test.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/tools/testing/selftests/mm/mdwe_test.c b/tools/testing/selftes= ts/mm/mdwe_test.c index f466a099f1bf..bc91bef5d254 100644 --- a/tools/testing/selftests/mm/mdwe_test.c +++ b/tools/testing/selftests/mm/mdwe_test.c @@ -163,9 +163,8 @@ TEST_F(mdwe, mprotect_WRITE_EXEC) =20 TEST_F(mdwe, mmap_FIXED) { - void *p, *p2; + void *p; =20 - p2 =3D mmap(NULL, self->size, PROT_READ | PROT_EXEC, self->flags, 0, 0); self->p =3D mmap(NULL, self->size, PROT_READ, self->flags, 0, 0); ASSERT_NE(self->p, MAP_FAILED); =20 --=20 2.17.1 From nobody Sun Feb 8 21:58:02 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E34CFC678D5 for ; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Mar 2023 19:04:51.2149 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 4cd9efac-e355-4d69-7a18-08db2007fea7 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: DBAEUR03FT036.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DU0PR08MB10368 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Peter Xu Sync prctl.h after the changes in b507808ebce ("mm: implement memory-deny-w= rite-execute as a prctl") Fixes: 4cf1fe34fd18 ("kselftest: vm: add tests for memory-deny-write-execut= e") Signed-off-by: Peter Xu [joey: added commit message] Signed-off-by: Joey Gouly Cc: Catalin Marinas Cc: Andrew Morton Cc: Arnaldo Carvalho de Melo --- tools/include/uapi/linux/prctl.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/tools/include/uapi/linux/prctl.h b/tools/include/uapi/linux/pr= ctl.h index a5e06dcbba13..1312a137f7fb 100644 --- a/tools/include/uapi/linux/prctl.h +++ b/tools/include/uapi/linux/prctl.h @@ -281,6 +281,12 @@ struct prctl_mm_map { # define PR_SME_VL_LEN_MASK 0xffff # define PR_SME_VL_INHERIT (1 << 17) /* inherit across exec */ =20 +/* Memory deny write / execute */ +#define PR_SET_MDWE 65 +# define PR_MDWE_REFUSE_EXEC_GAIN 1 + +#define PR_GET_MDWE 66 + #define PR_SET_VMA 0x53564d41 # define PR_SET_VMA_ANON_NAME 0 =20 --=20 2.17.1