From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x224Yz+v/jc/T3rcu5sCXDgDr630n6lZiKIlqHfbXe0S3YYEyzXUoZMOQyi/UFAK3LrqNRjvF ARC-Seal: i=1; a=rsa-sha256; t=1516647291; cv=none; d=google.com; s=arc-20160816; b=0Sbsh+nBHN7wiTgG+rwE5LrT2i8XQi34aupkzxfKVr4m+qjnb4n11e4ZnON/y/MkVn J5lro/rLmR+jajU4RRNfnjyMBz27mYf2PsPtMlcBFVeuhPrFrLeQ5HuXYO7qDYzmsFZR grXkN4Uscid9EPAKMuG802TQ0tb7vtluQuRgpGTqf5oNux/vljd5gCNmOkrGBNK6odj8 rSm9Cbywbgr9D4cWlJgOBuXcmzx3UFMtRCQIuhmD4wbfKVnhvlOlEfmB54F5rUtveHok uzRtMcvvmRKkwEsRI3ZqUJiqAYOyD4f/jgnlAaUmFyItluQ8aO12gf+brKS9z4vZak9f NvCQ== 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=epDiYrLSyli41St5diUx2tCZ7DJ4N9Z1t1HWb3pB4Jg=; b=CONyQQkyPV1CN7dJZyf9wElgJP4GFopCQVKyDZcRcDaIT34po+h1YtrqwVsZ0I7pD3 BRCYuBsFj98u327jhbW32Rsn2vlbzaI8OEa1fR03qA6G3NZq/E6VG7avKJL6lwcLz1Ax siln+FVAAUpR2hKiCx9C++uCc+miF4YCRWPZIKKS1oxts7zCVfFo4A3YmQhpRd4kBknU vKZB204iHLILc+gFqtGPBAwSngb94Um3hbulH3JnFyQHz5WWzJh7bIf152mofPylbMaA LASXNpub05OxZfncx9p1yYs7S9ZUpEknx6Q+Jk79cTWIt729icmIKdyS+hsOxIFHfsw5 N+Fw== ARC-Authentication-Results: i=1; mx.google.com; dkim=neutral (body hash did not verify) header.i=@gmail.com header.s=20161025 header.b=spcOl1/Z; 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=spcOl1/Z; 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 S1751581AbeAVSxx (ORCPT ); Mon, 22 Jan 2018 13:53:53 -0500 Received: from mail-qt0-f195.google.com ([209.85.216.195]:41685 "EHLO mail-qt0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751542AbeAVSxt (ORCPT ); Mon, 22 Jan 2018 13:53:49 -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 20/24] selftests/vm: testcases must restore pkey-permissions Date: Mon, 22 Jan 2018 10:52:13 -0800 Message-Id: <1516647137-11174-21-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?1590319951094931639?= X-GMAIL-MSGID: =?utf-8?q?1590319951094931639?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: Generally the signal handler restores the state of the pkey register before returning. However there are times when the read/write operation can legitamely fail without invoking the signal handler. Eg: A sys_read() operaton to a write-protected page should be disallowed. In such a case the state of the pkey register is not restored to its original state. The test case is responsible for restoring the key register state to its original value. Signed-off-by: Ram Pai --- tools/testing/selftests/vm/protection_keys.c | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-) diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c index 3e9e36d..5783587 100644 --- a/tools/testing/selftests/vm/protection_keys.c +++ b/tools/testing/selftests/vm/protection_keys.c @@ -1003,6 +1003,7 @@ void test_read_of_write_disabled_region(int *ptr, u16 pkey) ptr_contents = read_ptr(ptr); dprintf1("*ptr: %d\n", ptr_contents); dprintf1("\n"); + pkey_write_allow(pkey); } void test_read_of_access_disabled_region(int *ptr, u16 pkey) { @@ -1082,6 +1083,7 @@ void test_kernel_write_of_access_disabled_region(int *ptr, u16 pkey) ret = read(test_fd, ptr, 1); dprintf1("read ret: %d\n", ret); pkey_assert(ret); + pkey_access_allow(pkey); } void test_kernel_write_of_write_disabled_region(int *ptr, u16 pkey) { @@ -1094,6 +1096,7 @@ void test_kernel_write_of_write_disabled_region(int *ptr, u16 pkey) if (ret < 0 && (DEBUG_LEVEL > 0)) perror("verbose read result (OK for this to be bad)"); pkey_assert(ret); + pkey_write_allow(pkey); } void test_kernel_gup_of_access_disabled_region(int *ptr, u16 pkey) @@ -1113,6 +1116,7 @@ void test_kernel_gup_of_access_disabled_region(int *ptr, u16 pkey) vmsplice_ret = vmsplice(pipe_fds[1], &iov, 1, SPLICE_F_GIFT); dprintf1("vmsplice() ret: %d\n", vmsplice_ret); pkey_assert(vmsplice_ret == -1); + pkey_access_allow(pkey); close(pipe_fds[0]); close(pipe_fds[1]); @@ -1133,6 +1137,7 @@ void test_kernel_gup_write_to_write_disabled_region(int *ptr, u16 pkey) if (DEBUG_LEVEL > 0) perror("futex"); dprintf1("futex() ret: %d\n", futex_ret); + pkey_write_allow(pkey); } /* Assumes that all pkeys other than 'pkey' are unallocated */ -- 1.7.1