From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ram Pai Subject: [PATCH v9 46/51] selftest/vm: associate key on a mapped page and detect access violation Date: Mon, 6 Nov 2017 00:57:38 -0800 Message-ID: <1509958663-18737-47-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: owner-linux-mm@kvack.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 access-violation on a page to which access-disabled key is associated much after the page is mapped. Signed-off-by: Ram Pai --- tools/testing/selftests/vm/protection_keys.c | 19 +++++++++++++++++++ 1 files changed, 19 insertions(+), 0 deletions(-) diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c index 8f0dd94..998a44f 100644 --- a/tools/testing/selftests/vm/protection_keys.c +++ b/tools/testing/selftests/vm/protection_keys.c @@ -1015,6 +1015,24 @@ void test_read_of_access_disabled_region(int *ptr, u16 pkey) dprintf1("*ptr: %d\n", ptr_contents); expected_pkey_fault(pkey); } + +void test_read_of_access_disabled_region_with_page_already_mapped(int *ptr, + u16 pkey) +{ + int ptr_contents; + + dprintf1("disabling access to PKEY[%02d], doing read @ %p\n", + pkey, ptr); + ptr_contents = read_ptr(ptr); + dprintf1("reading ptr before disabling the read : %d\n", + ptr_contents); + rdpkey_reg(); + pkey_access_deny(pkey); + ptr_contents = read_ptr(ptr); + dprintf1("*ptr: %d\n", ptr_contents); + 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); @@ -1309,6 +1327,7 @@ void test_mprotect_pkey_on_unsupported_cpu(int *ptr, u16 pkey) void (*pkey_tests[])(int *ptr, u16 pkey) = { test_read_of_write_disabled_region, 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_access_disabled_region, test_kernel_write_of_access_disabled_region, -- 1.7.1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qk0-f193.google.com ([209.85.220.193]:46252 "EHLO mail-qk0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752670AbdKFJAd (ORCPT ); Mon, 6 Nov 2017 04:00:33 -0500 From: Ram Pai Subject: [PATCH v9 46/51] selftest/vm: associate key on a mapped page and detect access violation Date: Mon, 6 Nov 2017 00:57:38 -0800 Message-ID: <1509958663-18737-47-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: <20171106085738.TpfkD5Fmq7A7rj7fp56COtwBMUzhdm9CNp68CrzTPt4@z> detect access-violation on a page to which access-disabled key is associated much after the page is mapped. Signed-off-by: Ram Pai --- tools/testing/selftests/vm/protection_keys.c | 19 +++++++++++++++++++ 1 files changed, 19 insertions(+), 0 deletions(-) diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c index 8f0dd94..998a44f 100644 --- a/tools/testing/selftests/vm/protection_keys.c +++ b/tools/testing/selftests/vm/protection_keys.c @@ -1015,6 +1015,24 @@ void test_read_of_access_disabled_region(int *ptr, u16 pkey) dprintf1("*ptr: %d\n", ptr_contents); expected_pkey_fault(pkey); } + +void test_read_of_access_disabled_region_with_page_already_mapped(int *ptr, + u16 pkey) +{ + int ptr_contents; + + dprintf1("disabling access to PKEY[%02d], doing read @ %p\n", + pkey, ptr); + ptr_contents = read_ptr(ptr); + dprintf1("reading ptr before disabling the read : %d\n", + ptr_contents); + rdpkey_reg(); + pkey_access_deny(pkey); + ptr_contents = read_ptr(ptr); + dprintf1("*ptr: %d\n", ptr_contents); + 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); @@ -1309,6 +1327,7 @@ void test_mprotect_pkey_on_unsupported_cpu(int *ptr, u16 pkey) void (*pkey_tests[])(int *ptr, u16 pkey) = { test_read_of_write_disabled_region, 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_access_disabled_region, test_kernel_write_of_access_disabled_region, -- 1.7.1