From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x225iCJP9h1NCiySg3vz1xXI66dZwh7hVR+YQdn5Hh6VyqGFRERgGOFnhiH9ys+C2BMwIrqGL ARC-Seal: i=1; a=rsa-sha256; t=1516647356; cv=none; d=google.com; s=arc-20160816; b=TiA7wfnfupssAPNtCoXsKNai1Iqo8tQZO/Qz4kpM1NVe3zF2qr9sBEPjMZWGwfFJMd mhLkseOR6Q6XnhXOTYIaG80dzWdIrgBxvxSbQrfK54rIzin5OcJEbPJ27eYAuYYAX8ks P+G/1N3tfEiHchBdN6CcCjy5CqC36KxwIa7ggD865JahRwrGwiaG1zosjzRa0/o7ypfy KEjI637I8yp5n6B+W3ECe3fs9uLAbr0uXWI1jhcktMjF3RU7LGFlT3HSH0vumGrsCpSB 9XVTuMcZZfaQQWF6qXWp1wg/z960BnURK+q7q2EsQGtxqwaq/BjXKSitQ2h0xkw7mwaY rrXw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:references:in-reply-to:message-id:date :subject:cc:to:from:dkim-signature:arc-authentication-results; bh=/G8g1STa8UIcYWcF4wWgvhUMqtZSHk/pI2zVVhux/Y0=; b=dDXwwGz7fp0ucFDuco8U312Y8qZMDtFvY3PLhqSTGwpRBbECyvUzFIJ6sN8w/+5DAU Q4V8rMeS976C63OQvwYJVVDa0jmfi7ISyyFTS9hXEUHhfD0/p3a6TVAVZfjb9WeyQRcy cBCP6NGJn+CptNfjG6Y2aZLeJuYOT9lnrBWXYS6xhgVFaCPn5PxH2N3nBZhZ3vNvFbJE a1lid3UnV68/hnsfWiHO/dVQZ/KJKZBbO+B3DveOQG8AxhAsXQGysl67yHzlULZoIMGT 7kwijHMKk6tcBa95pf6tcD/S4SEWsJGDPewpsjLj/h/vU4L+d6l2KNG1zHvxwOaQIsuS OHSg== ARC-Authentication-Results: i=1; mx.google.com; dkim=neutral (body hash did not verify) header.i=@gmail.com header.s=20161025 header.b=pVe2HCEE; spf=pass (google.com: best guess record for domain of linux-kselftest-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kselftest-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=ibm.com Authentication-Results: mx.google.com; dkim=neutral (body hash did not verify) header.i=@gmail.com header.s=20161025 header.b=pVe2HCEE; spf=pass (google.com: best guess record for domain of linux-kselftest-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kselftest-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=ibm.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751510AbeAVSxn (ORCPT ); Mon, 22 Jan 2018 13:53:43 -0500 Received: from mail-qt0-f194.google.com ([209.85.216.194]:42697 "EHLO mail-qt0-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751459AbeAVSxk (ORCPT ); Mon, 22 Jan 2018 13:53:40 -0500 From: Ram Pai 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, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, mingo@redhat.com, akpm@linux-foundation.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, arnd@arndb.de Subject: [PATCH v10 17/24] selftests/vm: associate key on a mapped page and detect access violation Date: Mon, 22 Jan 2018 10:52:10 -0800 Message-Id: <1516647137-11174-18-git-send-email-linuxram@us.ibm.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1516647137-11174-1-git-send-email-linuxram@us.ibm.com> References: <1516647137-11174-1-git-send-email-linuxram@us.ibm.com> Sender: linux-kselftest-owner@vger.kernel.org X-Mailing-List: linux-kselftest@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1590320018876496713?= X-GMAIL-MSGID: =?utf-8?q?1590320018876496713?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 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 33d5839..1d3f596 100644 --- a/tools/testing/selftests/vm/protection_keys.c +++ b/tools/testing/selftests/vm/protection_keys.c @@ -1016,6 +1016,24 @@ 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); @@ -1310,6 +1328,7 @@ 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