From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F1E6FC433DF for ; Thu, 4 Jun 2020 23:52:35 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id A8E5B206DC for ; Thu, 4 Jun 2020 23:52:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="2A47w4aX" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A8E5B206DC Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 5221F28007A; Thu, 4 Jun 2020 19:52:35 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 4D1E5280005; Thu, 4 Jun 2020 19:52:35 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 3EC1B28007A; Thu, 4 Jun 2020 19:52:35 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0094.hostedemail.com [216.40.44.94]) by kanga.kvack.org (Postfix) with ESMTP id 24BBB280005 for ; Thu, 4 Jun 2020 19:52:35 -0400 (EDT) Received: from smtpin22.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id EE3E98248047 for ; Thu, 4 Jun 2020 23:52:34 +0000 (UTC) X-FDA: 76893181428.22.crowd37_201672b26d9b Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin22.hostedemail.com (Postfix) with ESMTP id D22B618038E68 for ; Thu, 4 Jun 2020 23:52:34 +0000 (UTC) X-HE-Tag: crowd37_201672b26d9b X-Filterd-Recvd-Size: 3856 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf22.hostedemail.com (Postfix) with ESMTP for ; Thu, 4 Jun 2020 23:52:34 +0000 (UTC) Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1B0DC20885; Thu, 4 Jun 2020 23:52:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591314753; bh=iBbTG2SZX9OgL8S1n8V6CkTSGWdYqwSs+9Aez9WeOy8=; h=Date:From:To:Subject:In-Reply-To:From; b=2A47w4aX9Xv89WdBDqSGdpRDOCEoOHj83Fo8MJEjqgB3pxS0O61so5TTCPGKUJs1Q iw++Pn4dbv4tjtBkz8vFRMWmzv7v4hdbBx0C6yk9FnLSbBQrs5x8eMRr+RuLVv2g4g FdMt6K4nXaHv9vGg/auCsE4/riXzdXL/T6v2ZR5g= Date: Thu, 04 Jun 2020 16:52:32 -0700 From: Andrew Morton To: akpm@linux-foundation.org, aneesh.kumar@linux.ibm.com, bauerman@linux.ibm.com, dave.hansen@intel.com, desnesn@linux.vnet.ibm.com, fweimer@redhat.com, linux-mm@kvack.org, linuxram@us.ibm.com, mhocko@kernel.org, mingo@kernel.org, mm-commits@vger.kernel.org, mpe@ellerman.id.au, msuchanek@suse.de, sandipan@linux.ibm.com, shuah@kernel.org, torvalds@linux-foundation.org Subject: [patch 119/127] selftests/vm/pkeys: associate key on a mapped page and detect write violation Message-ID: <20200604235232.x_RJMh4OP%akpm@linux-foundation.org> In-Reply-To: <20200604164523.e15f3177f4b69dcb4f2534a1@linux-foundation.org> User-Agent: s-nail v14.8.16 X-Rspamd-Queue-Id: D22B618038E68 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 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 Subject: selftests/vm/pkeys: associate key on a mapped page and detect write violation Detect write-violation on a page to which write-disabled key is associated much after the page is mapped. Link: http://lkml.kernel.org/r/6bfe3b3832f8bcfb07d7f2cf116b45197f4587dd.1585646528.git.sandipan@linux.ibm.com Signed-off-by: Ram Pai Acked-by: Dave Hansen Signed-off-by: Sandipan Das Cc: Dave Hansen Cc: Florian Weimer Cc: "Desnes A. Nunes do Rosario" Cc: Ingo Molnar Cc: Thiago Jung Bauermann Cc: "Aneesh Kumar K.V" Cc: Michael Ellerman Cc: Michal Hocko Cc: Michal Suchanek Cc: Shuah Khan Signed-off-by: Andrew Morton --- tools/testing/selftests/vm/protection_keys.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) --- a/tools/testing/selftests/vm/protection_keys.c~selftests-vm-pkeys-associate-key-on-a-mapped-page-and-detect-write-violation +++ a/tools/testing/selftests/vm/protection_keys.c @@ -1002,6 +1002,17 @@ void test_read_of_access_disabled_region 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); @@ -1410,6 +1421,7 @@ void (*pkey_tests[])(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, _