From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ram Pai Subject: [PATCH v9 47/51] selftest/vm: associate key on a mapped page and detect write violation Date: Mon, 6 Nov 2017 00:57:39 -0800 Message-ID: <1509958663-18737-48-git-send-email-linuxram@us.ibm.com> References: <1509958663-18737-1-git-send-email-linuxram@us.ibm.com> Return-path: In-Reply-To: <1509958663-18737-1-git-send-email-linuxram@us.ibm.com> Sender: linux-kernel-owner@vger.kernel.org To: mpe@ellerman.id.au, mingo@redhat.com, akpm@linux-foundation.org, corbet@lwn.net, arnd@arndb.de Cc: linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, x86@kernel.org, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, dave.hansen@intel.com, benh@kernel.crashing.org, paulus@samba.org, khandual@linux.vnet.ibm.com, aneesh.kumar@linux.vnet.ibm.com, bsingharora@gmail.com, hbabu@us.ibm.com, mhocko@kernel.org, bauerman@linux.vnet.ibm.com, ebiederm@xmission.com, linuxram@us.ibm.com List-Id: linux-arch.vger.kernel.org detect write-violation on a page to which write-disabled key is associated much after the page is mapped. Signed-off-by: Ram Pai --- tools/testing/selftests/vm/protection_keys.c | 12 ++++++++++++ 1 files changed, 12 insertions(+), 0 deletions(-) diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c index 998a44f..0b7b826 100644 --- a/tools/testing/selftests/vm/protection_keys.c +++ b/tools/testing/selftests/vm/protection_keys.c @@ -1033,6 +1033,17 @@ void test_read_of_access_disabled_region_with_page_already_mapped(int *ptr, expected_pkey_fault(pkey); } +void test_write_of_write_disabled_region_with_page_already_mapped(int *ptr, + u16 pkey) +{ + *ptr = __LINE__; + dprintf1("disabling write access; after accessing the page, " + "to PKEY[%02d], doing write\n", pkey); + pkey_write_deny(pkey); + *ptr = __LINE__; + expected_pkey_fault(pkey); +} + void test_write_of_write_disabled_region(int *ptr, u16 pkey) { dprintf1("disabling write access to PKEY[%02d], doing write\n", pkey); @@ -1329,6 +1340,7 @@ void test_mprotect_pkey_on_unsupported_cpu(int *ptr, u16 pkey) test_read_of_access_disabled_region, test_read_of_access_disabled_region_with_page_already_mapped, test_write_of_write_disabled_region, + test_write_of_write_disabled_region_with_page_already_mapped, test_write_of_access_disabled_region, test_kernel_write_of_access_disabled_region, test_kernel_write_of_write_disabled_region, -- 1.7.1 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qt0-f196.google.com ([209.85.216.196]:44644 "EHLO mail-qt0-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752474AbdKFJAf (ORCPT ); Mon, 6 Nov 2017 04:00:35 -0500 From: Ram Pai Subject: [PATCH v9 47/51] selftest/vm: associate key on a mapped page and detect write violation Date: Mon, 6 Nov 2017 00:57:39 -0800 Message-ID: <1509958663-18737-48-git-send-email-linuxram@us.ibm.com> In-Reply-To: <1509958663-18737-1-git-send-email-linuxram@us.ibm.com> References: <1509958663-18737-1-git-send-email-linuxram@us.ibm.com> Sender: linux-arch-owner@vger.kernel.org List-ID: To: mpe@ellerman.id.au, mingo@redhat.com, akpm@linux-foundation.org, corbet@lwn.net, arnd@arndb.de Cc: linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, x86@kernel.org, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, dave.hansen@intel.com, benh@kernel.crashing.org, paulus@samba.org, khandual@linux.vnet.ibm.com, aneesh.kumar@linux.vnet.ibm.com, bsingharora@gmail.com, hbabu@us.ibm.com, mhocko@kernel.org, bauerman@linux.vnet.ibm.com, ebiederm@xmission.com, linuxram@us.ibm.com Message-ID: <20171106085739.KXLyobQ8j1Diwx7MXAVV_8zL0F5kJ_uOXkV7u5abH8g@z> detect write-violation on a page to which write-disabled key is associated much after the page is mapped. Signed-off-by: Ram Pai --- tools/testing/selftests/vm/protection_keys.c | 12 ++++++++++++ 1 files changed, 12 insertions(+), 0 deletions(-) diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c index 998a44f..0b7b826 100644 --- a/tools/testing/selftests/vm/protection_keys.c +++ b/tools/testing/selftests/vm/protection_keys.c @@ -1033,6 +1033,17 @@ void test_read_of_access_disabled_region_with_page_already_mapped(int *ptr, expected_pkey_fault(pkey); } +void test_write_of_write_disabled_region_with_page_already_mapped(int *ptr, + u16 pkey) +{ + *ptr = __LINE__; + dprintf1("disabling write access; after accessing the page, " + "to PKEY[%02d], doing write\n", pkey); + pkey_write_deny(pkey); + *ptr = __LINE__; + expected_pkey_fault(pkey); +} + void test_write_of_write_disabled_region(int *ptr, u16 pkey) { dprintf1("disabling write access to PKEY[%02d], doing write\n", pkey); @@ -1329,6 +1340,7 @@ void test_mprotect_pkey_on_unsupported_cpu(int *ptr, u16 pkey) test_read_of_access_disabled_region, test_read_of_access_disabled_region_with_page_already_mapped, test_write_of_write_disabled_region, + test_write_of_write_disabled_region_with_page_already_mapped, test_write_of_access_disabled_region, test_kernel_write_of_access_disabled_region, test_kernel_write_of_write_disabled_region, -- 1.7.1