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 5C26BC433E0 for ; Thu, 4 Jun 2020 23:52:39 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 209722087D for ; Thu, 4 Jun 2020 23:52:39 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="hW6GZKCX" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 209722087D 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 C4DE028007B; Thu, 4 Jun 2020 19:52:38 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id BD7E4280005; Thu, 4 Jun 2020 19:52:38 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id AEDEA28007B; Thu, 4 Jun 2020 19:52:38 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0102.hostedemail.com [216.40.44.102]) by kanga.kvack.org (Postfix) with ESMTP id 93ABA280005 for ; Thu, 4 Jun 2020 19:52:38 -0400 (EDT) Received: from smtpin26.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 5810C180AD802 for ; Thu, 4 Jun 2020 23:52:38 +0000 (UTC) X-FDA: 76893181596.26.flesh06_0b0b7c426d9b Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin26.hostedemail.com (Postfix) with ESMTP id 43FF51804B3A2 for ; Thu, 4 Jun 2020 23:52:38 +0000 (UTC) X-HE-Tag: flesh06_0b0b7c426d9b X-Filterd-Recvd-Size: 3829 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf18.hostedemail.com (Postfix) with ESMTP for ; Thu, 4 Jun 2020 23:52:37 +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 93BA4206DC; Thu, 4 Jun 2020 23:52:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591314757; bh=ECkQqZTtKNE+L7UUFp1JZjftX1I8HM6+8BhTlW66LhE=; h=Date:From:To:Subject:In-Reply-To:From; b=hW6GZKCXbfnb2499BO+TIgXz6DMNagzUqyOpdVY7OLtaXe1lFeOPFkpw5hMP4k1sk nrBhe7a9lEL5qU/w8yCcgnTi+9ATasHbTAFFg6RPU9uk8ymx9ZxRRYwn9ghfDgsB31 k9BIYPkWYCsMQmErXFX/fOnCVieqTaxD6c2sKi1c= Date: Thu, 04 Jun 2020 16:52:36 -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 120/127] selftests/vm/pkeys: detect write violation on a mapped access-denied-key page Message-ID: <20200604235236.8uWepbFu4%akpm@linux-foundation.org> In-Reply-To: <20200604164523.e15f3177f4b69dcb4f2534a1@linux-foundation.org> User-Agent: s-nail v14.8.16 X-Rspamd-Queue-Id: 43FF51804B3A2 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam05 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: detect write violation on a mapped access-denied-key page Detect write-violation on a page to which access-disabled key is associated much after the page is mapped. Link: http://lkml.kernel.org/r/6a7dd4069ee18a2a51b207a55aa197f3f3c59753.1585646528.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 | 13 +++++++++++++ 1 file changed, 13 insertions(+) --- a/tools/testing/selftests/vm/protection_keys.c~selftests-vm-pkeys-detect-write-violation-on-a-mapped-access-denied-key-page +++ a/tools/testing/selftests/vm/protection_keys.c @@ -1027,6 +1027,18 @@ void test_write_of_access_disabled_regio *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, _