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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Thu, 30 Jan 2020 06:38:05 -0000 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 00U6c35p19005604 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 30 Jan 2020 06:38:03 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 86F044C040; Thu, 30 Jan 2020 06:38:03 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0606D4C046; Thu, 30 Jan 2020 06:38:01 +0000 (GMT) Received: from fir03.in.ibm.com (unknown [9.121.59.65]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 30 Jan 2020 06:38:00 +0000 (GMT) From: Sandipan Das To: shuah@kernel.org, skhan@linuxfoundation.org, linux-kselftest@vger.kernel.org Cc: linux-arch@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, x86@kernel.org, linux-mm@kvack.org, fweimer@redhat.com, dave.hansen@intel.com, linuxram@us.ibm.com, mhocko@kernel.org, mingo@redhat.com, aneesh.kumar@linux.ibm.com, bauerman@linux.ibm.com, msuchanek@suse.de, mpe@ellerman.id.au Subject: [PATCH v18 19/24] selftests/vm/pkeys: Detect write violation on a mapped access-denied-key page Date: Thu, 30 Jan 2020 12:07:01 +0530 X-Mailer: git-send-email 2.17.1 In-Reply-To: References: In-Reply-To: References: X-TM-AS-GCONF: 00 x-cbid: 20013006-0020-0000-0000-000003A54436 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20013006-0021-0000-0000-000021FCF808 Message-Id: <97a1f35cb594830d1046e4440d95e0f7c45795d2.1580365432.git.sandipan@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-01-30_01:2020-01-28,2020-01-30 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 suspectscore=0 lowpriorityscore=0 adultscore=0 malwarescore=0 phishscore=0 priorityscore=1501 spamscore=0 mlxlogscore=999 impostorscore=0 bulkscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1911200001 definitions=main-2001300042 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Ram Pai 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 Signed-off-by: Sandipan Das --- tools/testing/selftests/vm/protection_keys.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c index cb31a5cdf6d9..8bb4de103874 100644 --- a/tools/testing/selftests/vm/protection_keys.c +++ b/tools/testing/selftests/vm/protection_keys.c @@ -1027,6 +1027,18 @@ 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; @@ -1423,6 +1435,7 @@ void (*pkey_tests[])(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, -- 2.17.1