From patchwork Sat Apr 18 03:18:32 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Gow X-Patchwork-Id: 208581 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=-17.4 required=3.0 tests=DKIMWL_WL_MED, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT, USER_IN_DEF_DKIM_WL autolearn=ham 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 0713FC2BA19 for ; Sat, 18 Apr 2020 03:19:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D795721D94 for ; Sat, 18 Apr 2020 03:18:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="JS/kAYv0" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726061AbgDRDS6 (ORCPT ); Fri, 17 Apr 2020 23:18:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41542 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1725887AbgDRDS5 (ORCPT ); Fri, 17 Apr 2020 23:18:57 -0400 Received: from mail-pg1-x549.google.com (mail-pg1-x549.google.com [IPv6:2607:f8b0:4864:20::549]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DE18CC061A0C for ; Fri, 17 Apr 2020 20:18:56 -0700 (PDT) Received: by mail-pg1-x549.google.com with SMTP id i21so528126pgl.19 for ; Fri, 17 Apr 2020 20:18:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=fsQ6zkM7uoUMiPnsVxSRYiwCGVhnWM0mTHH2Nkqj5zo=; b=JS/kAYv0bCGD7ghxIICrHhV6O1k6xFCnZ7GMKqlZpjiBgcoJUj3wsm7iUi2Dz7IquY hPINCzmhGabkrLB2vUjaGYrSXuOcF5dB0tbFYfzcuw/cFqJmy4Gn8Gs3/+8en/p9cU48 t4KeDZnK5hx1xWTBtfSfhA+psL+j2PeR1AOUewseCP8baiMhVJBlOPiyKQEa647DtvUf BXN46tlEBbV21NLpCt3uVOKX5CMHklh9ZoBvRSApLAyKNcCF8LVRPCGBNsNJpOFn2IEa zhWbfUDRaWlAN+zQHMzbokY/Z63QwQ7HBa/TxnB687aWivYgtuwLxORG8rleo8WgA0/m 0VHA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=fsQ6zkM7uoUMiPnsVxSRYiwCGVhnWM0mTHH2Nkqj5zo=; b=mxm2mR+YjqNC/McIrJWobVO0HXbswD2wNs3S5hZ7RrPFQxVPrK1cVFzH72aMpmh/eg ztDpoj/RQecUebpkcUTt49dpp2fsjyoP4ppEw0Y6OvaPUZQZwoxOclZ/tW4pTH+r9ZTu FewISEawApdMkYUV1/aK6C/Zhwz4TzoWmWITOeZCivdgBuW9dR95hQkjtwaPgHtjIL3f ZmjV/ZIfIRKIjbToK6XsWZQsH8lX0Q4AdBnoA1aOUqWkVbtA26pSZlXqquSzhIBhxwlZ 11LTH0CcyMFohEVYyBSTD1gMYxhO9EFd7cXXa0bj/Udyrym59cL0FUuqUJ4WIDJiYmkA vBKA== X-Gm-Message-State: AGi0PuaP+C98cUN98fXMGg5IkYEjKDxktAOPyb0R+C0BcKEwZuh9Evsf mcGHLiM9ZNrbf/2F8gofJw79U/DvbWjMJA== X-Google-Smtp-Source: APiQypJToXA6KorNY8OJq7EE7Oef49xa3b4K1js/y01Pd5WOz27y7u0RrUrRW2a7LEWiRejVuyuGJCRi5RTAfw== X-Received: by 2002:a17:90a:7486:: with SMTP id p6mr7991333pjk.62.1587179936368; Fri, 17 Apr 2020 20:18:56 -0700 (PDT) Date: Fri, 17 Apr 2020 20:18:32 -0700 In-Reply-To: <20200418031833.234942-1-davidgow@google.com> Message-Id: <20200418031833.234942-5-davidgow@google.com> Mime-Version: 1.0 References: <20200418031833.234942-1-davidgow@google.com> X-Mailer: git-send-email 2.26.1.301.g55bc3eb7cb9-goog Subject: [PATCH v6 4/5] KASAN: Testing Documentation From: David Gow To: trishalfonso@google.com, brendanhiggins@google.com, aryabinin@virtuozzo.com, dvyukov@google.com, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org Cc: linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, kunit-dev@googlegroups.com, linux-kselftest@vger.kernel.org, David Gow Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org From: Patricia Alfonso Include documentation on how to test KASAN using CONFIG_TEST_KASAN and CONFIG_TEST_KASAN_USER. Signed-off-by: Patricia Alfonso Reviewed-by: Dmitry Vyukov Signed-off-by: David Gow --- Documentation/dev-tools/kasan.rst | 70 +++++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+) diff --git a/Documentation/dev-tools/kasan.rst b/Documentation/dev-tools/kasan.rst index c652d740735d..74fa6aa0f0df 100644 --- a/Documentation/dev-tools/kasan.rst +++ b/Documentation/dev-tools/kasan.rst @@ -281,3 +281,73 @@ unmapped. This will require changes in arch-specific code. This allows ``VMAP_STACK`` support on x86, and can simplify support of architectures that do not have a fixed module region. + +CONFIG_TEST_KASAN_KUNIT & CONFIG_TEST_KASAN_MODULE +-------------------------------------------------- + +``CONFIG_TEST_KASAN_KUNIT`` utilizes the KUnit Test Framework for testing. +This means each test focuses on a small unit of functionality and +there are a few ways these tests can be run. + +Each test will print the KASAN report if an error is detected and then +print the number of the test and the status of the test: + +pass:: + + ok 28 - kmalloc_double_kzfree +or, if kmalloc failed:: + + # kmalloc_large_oob_right: ASSERTION FAILED at lib/test_kasan.c:163 + Expected ptr is not null, but is + not ok 4 - kmalloc_large_oob_right +or, if a KASAN report was expected, but not found:: + + # kmalloc_double_kzfree: EXPECTATION FAILED at lib/test_kasan.c:629 + Expected kasan_data->report_expected == kasan_data->report_found, but + kasan_data->report_expected == 1 + kasan_data->report_found == 0 + not ok 28 - kmalloc_double_kzfree + +All test statuses are tracked as they run and an overall status will +be printed at the end:: + + ok 1 - kasan_kunit_test + +or:: + + not ok 1 - kasan_kunit_test + +(1) Loadable Module +~~~~~~~~~~~~~~~~~~~~ + +With ``CONFIG_KUNIT`` enabled, ``CONFIG_TEST_KASAN_KUNIT`` can be built as +a loadable module and run on any architecture that supports KASAN +using something like insmod or modprobe. + +(2) Built-In +~~~~~~~~~~~~~ + +With ``CONFIG_KUNIT`` built-in, ``CONFIG_TEST_KASAN_KUNIT`` can be built-in +on any architecure that supports KASAN. These and any other KUnit +tests enabled will run and print the results at boot as a late-init +call. + +(3) Using kunit_tool +~~~~~~~~~~~~~~~~~~~~~ + +With ``CONFIG_KUNIT`` and ``CONFIG_TEST_KASAN`` built-in, we can also +use kunit_tool to see the results of these along with other KUnit +tests in a more readable way. This will not print the KASAN reports +of tests that passed. Use `KUnit documentation `_ for more up-to-date +information on kunit_tool. + +.. _KUnit: https://www.kernel.org/doc/html/latest/dev-tools/kunit/index.html + +``CONFIG_TEST_KASAN_MODULE`` is a set of KASAN tests that could not be +converted to KUnit. These tests can be run only as a module with +``CONFIG_TEST_KASAN_MODULE`` built as a loadable module and +``CONFIG_KASAN`` built-in. The type of error expected and the +function being run is printed before the expression expected to give +an error. Then the error is printed, if found, and that test +should be interpretted to pass only if the error was the one expected +by the test.