From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qt0-f200.google.com (mail-qt0-f200.google.com [209.85.216.200]) by kanga.kvack.org (Postfix) with ESMTP id A29136B027B for ; Tue, 17 Jul 2018 09:50:44 -0400 (EDT) Received: by mail-qt0-f200.google.com with SMTP id d18-v6so741864qtj.20 for ; Tue, 17 Jul 2018 06:50:44 -0700 (PDT) Received: from mail-sor-f65.google.com (mail-sor-f65.google.com. [209.85.220.65]) by mx.google.com with SMTPS id x20-v6sor489340qtp.124.2018.07.17.06.50.43 for (Google Transport Security); Tue, 17 Jul 2018 06:50:43 -0700 (PDT) From: Ram Pai Subject: [PATCH v14 19/22] selftests/vm: detect write violation on a mapped access-denied-key page Date: Tue, 17 Jul 2018 06:49:22 -0700 Message-Id: <1531835365-32387-20-git-send-email-linuxram@us.ibm.com> In-Reply-To: <1531835365-32387-1-git-send-email-linuxram@us.ibm.com> References: <1531835365-32387-1-git-send-email-linuxram@us.ibm.com> Sender: owner-linux-mm@kvack.org List-ID: To: shuahkh@osg.samsung.com, linux-kselftest@vger.kernel.org Cc: mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, x86@kernel.org, linux-arch@vger.kernel.org, mingo@redhat.com, dave.hansen@intel.com, mhocko@kernel.org, bauerman@linux.vnet.ibm.com, linuxram@us.ibm.com, fweimer@redhat.com, msuchanek@suse.de, aneesh.kumar@linux.vnet.ibm.com detect write-violation on a page to which access-disabled key is associated much after the page is mapped. cc: Dave Hansen cc: Florian Weimer Signed-off-by: Ram Pai Acked-by: Dave Hansen --- tools/testing/selftests/vm/protection_keys.c | 13 +++++++++++++ 1 files changed, 13 insertions(+), 0 deletions(-) diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c index 59f6f33..8a6afdd 100644 --- a/tools/testing/selftests/vm/protection_keys.c +++ b/tools/testing/selftests/vm/protection_keys.c @@ -1063,6 +1063,18 @@ void test_write_of_access_disabled_region(int *ptr, u16 pkey) *ptr = __LINE__; expected_pkey_fault(pkey); } + +void test_write_of_access_disabled_region_with_page_already_mapped(int *ptr, + u16 pkey) +{ + *ptr = __LINE__; + dprintf1("disabling access; after accessing the page, " + " to PKEY[%02d], doing write\n", pkey); + pkey_access_deny(pkey); + *ptr = __LINE__; + expected_pkey_fault(pkey); +} + void test_kernel_write_of_access_disabled_region(int *ptr, u16 pkey) { int ret; @@ -1430,6 +1442,7 @@ void test_mprotect_pkey_on_unsupported_cpu(int *ptr, u16 pkey) test_write_of_write_disabled_region, test_write_of_write_disabled_region_with_page_already_mapped, test_write_of_access_disabled_region, + test_write_of_access_disabled_region_with_page_already_mapped, test_kernel_write_of_access_disabled_region, test_kernel_write_of_write_disabled_region, test_kernel_gup_of_access_disabled_region, -- 1.7.1