From patchwork Tue Sep 1 09:27:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Amit Kachhap X-Patchwork-Id: 255254 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=-13.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 59CDCC433E7 for ; Tue, 1 Sep 2020 09:28:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3F0802098B for ; Tue, 1 Sep 2020 09:28:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726126AbgIAJ1o (ORCPT ); Tue, 1 Sep 2020 05:27:44 -0400 Received: from foss.arm.com ([217.140.110.172]:39146 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726537AbgIAJ1m (ORCPT ); Tue, 1 Sep 2020 05:27:42 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id D719D1063; Tue, 1 Sep 2020 02:27:41 -0700 (PDT) Received: from a077416.arm.com (unknown [10.57.6.112]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 081273F71F; Tue, 1 Sep 2020 02:27:38 -0700 (PDT) From: Amit Daniel Kachhap To: linux-arm-kernel@lists.infradead.org, linux-kselftest@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Shuah Khan , Catalin Marinas , Will Deacon , Vincenzo Frascino , Amit Daniel Kachhap , Gabor Kertesz Subject: [PATCH 2/6] kselftest/arm64: Verify mte tag inclusion via prctl Date: Tue, 1 Sep 2020 14:57:15 +0530 Message-Id: <20200901092719.9918-3-amit.kachhap@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200901092719.9918-1-amit.kachhap@arm.com> References: <20200901092719.9918-1-amit.kachhap@arm.com> Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org This testcase verifies that the tag generated with "irg" instruction contains only included tags. This is done via prtcl call. This test covers 4 scenarios, * At least one included tag. * More than one included tags. * None included. * All included. Cc: Shuah Khan Cc: Catalin Marinas Cc: Will Deacon Co-developed-by: Gabor Kertesz Signed-off-by: Gabor Kertesz Signed-off-by: Amit Daniel Kachhap --- tools/testing/selftests/arm64/mte/.gitignore | 1 + .../arm64/mte/check_tags_inclusion.c | 183 ++++++++++++++++++ 2 files changed, 184 insertions(+) create mode 100644 tools/testing/selftests/arm64/mte/check_tags_inclusion.c diff --git a/tools/testing/selftests/arm64/mte/.gitignore b/tools/testing/selftests/arm64/mte/.gitignore index 3f8c1f6c82b9..c3fca255d3d6 100644 --- a/tools/testing/selftests/arm64/mte/.gitignore +++ b/tools/testing/selftests/arm64/mte/.gitignore @@ -1 +1,2 @@ check_buffer_fill +check_tags_inclusion diff --git a/tools/testing/selftests/arm64/mte/check_tags_inclusion.c b/tools/testing/selftests/arm64/mte/check_tags_inclusion.c new file mode 100644 index 000000000000..9614988e2e75 --- /dev/null +++ b/tools/testing/selftests/arm64/mte/check_tags_inclusion.c @@ -0,0 +1,183 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2020 ARM Limited + +#define _GNU_SOURCE + +#include +#include +#include +#include +#include +#include +#include + +#include "kselftest.h" +#include "mte_common_util.h" +#include "mte_def.h" + +#define BUFFER_SIZE (5 * MT_GRANULE_SIZE) +#define RUNS (MT_TAG_COUNT * 2) +#define MTE_LAST_TAG_MASK (0x7FFF) + +static int verify_mte_pointer_validity(char *ptr, int mode) +{ + mte_initialize_current_context(mode, (uintptr_t)ptr, BUFFER_SIZE); + /* Check the validity of the tagged pointer */ + memset((void *)ptr, '1', BUFFER_SIZE); + mte_wait_after_trig(); + if (cur_mte_cxt.fault_valid) + return KSFT_FAIL; + /* Proceed further for nonzero tags */ + if (!MT_FETCH_TAG((uintptr_t)ptr)) + return KSFT_PASS; + mte_initialize_current_context(mode, (uintptr_t)ptr, BUFFER_SIZE + 1); + /* Check the validity outside the range */ + ptr[BUFFER_SIZE] = '2'; + mte_wait_after_trig(); + if (!cur_mte_cxt.fault_valid) + return KSFT_FAIL; + else + return KSFT_PASS; +} + +static int check_single_included_tags(int mem_type, int mode) +{ + char *ptr; + int tag, run, result = KSFT_PASS; + + ptr = (char *)mte_allocate_memory(BUFFER_SIZE + MT_GRANULE_SIZE, mem_type, 0, false); + if (check_allocated_memory(ptr, BUFFER_SIZE + MT_GRANULE_SIZE, + mem_type, false) != KSFT_PASS) + return KSFT_FAIL; + + for (tag = 0; (tag < MT_TAG_COUNT) && (result == KSFT_PASS); tag++) { + mte_switch_mode(mode, MT_INCLUDE_VALID_TAG(tag)); + /* Try to catch a excluded tag by a number of tries. */ + for (run = 0; (run < RUNS) && (result == KSFT_PASS); run++) { + ptr = (char *)mte_insert_tags(ptr, BUFFER_SIZE); + /* Check tag value */ + if (MT_FETCH_TAG((uintptr_t)ptr) == tag) { + ksft_print_msg("FAIL: wrong tag = 0x%x with include mask=0x%x\n", + MT_FETCH_TAG((uintptr_t)ptr), + MT_INCLUDE_VALID_TAG(tag)); + result = KSFT_FAIL; + break; + } + result = verify_mte_pointer_validity(ptr, mode); + } + } + mte_free_memory_tag_range((void *)ptr, BUFFER_SIZE, mem_type, 0, MT_GRANULE_SIZE); + return result; +} + +static int check_multiple_included_tags(int mem_type, int mode) +{ + char *ptr; + int tag, run, result = KSFT_PASS; + unsigned long excl_mask = 0; + + ptr = (char *)mte_allocate_memory(BUFFER_SIZE + MT_GRANULE_SIZE, mem_type, 0, false); + if (check_allocated_memory(ptr, BUFFER_SIZE + MT_GRANULE_SIZE, + mem_type, false) != KSFT_PASS) + return KSFT_FAIL; + + for (tag = 0; (tag < MT_TAG_COUNT - 1) && (result == KSFT_PASS); tag++) { + excl_mask |= 1 << tag; + mte_switch_mode(mode, MT_INCLUDE_VALID_TAGS(excl_mask)); + /* Try to catch a excluded tag by a number of tries. */ + for (run = 0; (run < RUNS) && (result == KSFT_PASS); run++) { + /* If excl_mask is all except last then clear tag for the next loop */ + if (excl_mask == MTE_LAST_TAG_MASK && run) + ptr = (char *)MT_CLEAR_TAG((unsigned long)ptr); + ptr = (char *)mte_insert_tags(ptr, BUFFER_SIZE); + /* Check tag value */ + if (MT_FETCH_TAG((uintptr_t)ptr) < tag) { + ksft_print_msg("FAIL: wrong tag = 0x%x with include mask=0x%x\n", + MT_FETCH_TAG((uintptr_t)ptr), + MT_INCLUDE_VALID_TAGS(excl_mask)); + result = KSFT_FAIL; + break; + } + result = verify_mte_pointer_validity(ptr, mode); + } + } + mte_free_memory_tag_range((void *)ptr, BUFFER_SIZE, mem_type, 0, MT_GRANULE_SIZE); + return result; +} + +static int check_all_included_tags(int mem_type, int mode) +{ + char *ptr; + int run, result = KSFT_PASS; + + ptr = (char *)mte_allocate_memory(BUFFER_SIZE + MT_GRANULE_SIZE, mem_type, 0, false); + if (check_allocated_memory(ptr, BUFFER_SIZE + MT_GRANULE_SIZE, + mem_type, false) != KSFT_PASS) + return KSFT_FAIL; + + mte_switch_mode(mode, MT_INCLUDE_TAG_MASK); + /* Try to catch a excluded tag by a number of tries. */ + for (run = 0; (run < RUNS) && (result == KSFT_PASS); run++) { + ptr = (char *)mte_insert_tags(ptr, BUFFER_SIZE); + /* + * Here tag byte can be between 0x0 to 0xF so no need to match so + * just verify if it is writable. + */ + result = verify_mte_pointer_validity(ptr, mode); + } + mte_free_memory_tag_range((void *)ptr, BUFFER_SIZE, mem_type, 0, MT_GRANULE_SIZE); + return result; +} + +static int check_none_included_tags(int mem_type, int mode) +{ + char *ptr; + + ptr = (char *)mte_allocate_memory(BUFFER_SIZE, mem_type, 0, false); + if (check_allocated_memory(ptr, BUFFER_SIZE, mem_type, false) != KSFT_PASS) + return KSFT_FAIL; + + mte_switch_mode(mode, 0); + ptr = (char *)mte_insert_tags(ptr, BUFFER_SIZE); + /* Check tag value */ + if (MT_FETCH_TAG((uintptr_t)ptr)) { + ksft_print_msg("FAIL: included tag value found\n"); + return KSFT_FAIL; + } + mte_initialize_current_context(mode, (uintptr_t)ptr, BUFFER_SIZE); + /* Check the write validity of the untagged pointer */ + memset((void *)ptr, '1', BUFFER_SIZE); + mte_wait_after_trig(); + if (cur_mte_cxt.fault_valid) + return KSFT_FAIL; + else + return KSFT_PASS; +} + +int main(int argc, char *argv[]) +{ + int err; + + err = mte_default_setup(); + if (err) + return err; + + /* Register SIGSEGV handler */ + mte_register_signal(SIGSEGV, mte_default_handler); + + evaluate_test(check_single_included_tags(USE_MMAP, MTE_SYNC_ERR), + "Check an included tag value with sync mode\n"); + + evaluate_test(check_multiple_included_tags(USE_MMAP, MTE_SYNC_ERR), + "Check different included tags value with sync mode\n"); + + evaluate_test(check_none_included_tags(USE_MMAP, MTE_SYNC_ERR), + "Check none included tags value with sync mode\n"); + + evaluate_test(check_all_included_tags(USE_MMAP, MTE_SYNC_ERR), + "Check all included tags value with sync mode\n"); + + mte_restore_setup(); + ksft_print_cnts(); + return ksft_get_fail_cnt() == 0 ? KSFT_PASS : KSFT_FAIL; +}