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=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL 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 AAF6EC433DB for ; Mon, 1 Feb 2021 19:46:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 697E364DDB for ; Mon, 1 Feb 2021 19:46:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231797AbhBATqT (ORCPT ); Mon, 1 Feb 2021 14:46:19 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40304 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229981AbhBATpX (ORCPT ); Mon, 1 Feb 2021 14:45:23 -0500 Received: from mail-qk1-x74a.google.com (mail-qk1-x74a.google.com [IPv6:2607:f8b0:4864:20::74a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 117F2C06178A for ; Mon, 1 Feb 2021 11:43:55 -0800 (PST) Received: by mail-qk1-x74a.google.com with SMTP id 185so14133681qkl.6 for ; Mon, 01 Feb 2021 11:43:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:in-reply-to:message-id:mime-version:references:subject :from:to:cc; bh=XCxo0tPucACpabOxuZtkTLtcboXhH0Xr2jZowtJcY6I=; b=nnt2QvzSfV0fa4ZZ03BZbnCp26ygACCoyTH46dpZyV9pLif0zOs6SXCEH2kcnjoFoV U1X5EXE1b/4nl5HZlwRerfFqKzt7jlwQz2d6uc95LKZ+SqbWeT8/Jp5hmPe3wZ5Q5tR+ Me7mRSARwZsr3WcDQyZ/mm/huwmItQuMt6csyGU8hTuyjthwd5A/Nn8C9a4mByWlS1VZ 1MkGWO4bG9xlswrcA618UKRyKeogViFJD3prqZJKBHRo3djA6zeLo3w47rwnsunN0gz3 flvwfX50AHe7/LCWla+sbrMmy1N/cEUeB+vO+5PGoJ4Hd85oD2y2azxexCmHYTpLxzJp /Jiw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=XCxo0tPucACpabOxuZtkTLtcboXhH0Xr2jZowtJcY6I=; b=ZA3CwlwqLVfJPxhJFGJXPPPRc7DGjlHFSx5e/lSZdVQTWo3n8l2Cxh/wf6BGkFDXiu HPpChFDrvz2J/qYpATnORLWyTU6uZPVKbbTjMgxtMzmmgdkzZqbKAQXuOrMgYWhH2WEh i/PZxPcXVmZoMYFnS89UQoxKvRLjTNb2Lg6feoeaVWz4lq/nW7KUXvgH+k/WqEJVeLKd /q3f1lXn54Nk6k/LPxfMnzHONIbCFjohpI9VWlpkmf6pPUJst9KSbTkhBvXuSaeclNpe ZJFhuSd3RZR4knPg+Ecjvnpgu7aLDPIPvdD2a2WocIoOv5MwTWiVfjE+Gp+1QAS/RWm7 hZNQ== X-Gm-Message-State: AOAM532oqAVcee90dp71MCSUeNkEXTPqjjNOXQHgxmbesaP0n+FeAsM5 HDEYyCCdMXItqJvgl9MFRRT+JJhNVuO4ljVt X-Google-Smtp-Source: ABdhPJwdXbY1qM/NMUi7jaSpz4LhDzmb7rta6x+9O6xGnsVRwYvyMYrhWT+3uFTKuYlZPyvi6dklTIkdGEdweICZ Sender: "andreyknvl via sendgmr" X-Received: from andreyknvl3.muc.corp.google.com ([2a00:79e0:15:13:7220:84ff:fe09:7e9d]) (user=andreyknvl job=sendgmr) by 2002:ad4:40c6:: with SMTP id x6mr16803415qvp.10.1612208634261; Mon, 01 Feb 2021 11:43:54 -0800 (PST) Date: Mon, 1 Feb 2021 20:43:30 +0100 In-Reply-To: Message-Id: <995edb531f4f976277d7da9ca8a78a96a2ea356e.1612208222.git.andreyknvl@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.30.0.365.g02bc693789-goog Subject: [PATCH 06/12] kasan: rework krealloc tests From: Andrey Konovalov To: Catalin Marinas , Vincenzo Frascino , Dmitry Vyukov , Alexander Potapenko , Marco Elver Cc: Andrew Morton , Will Deacon , Andrey Ryabinin , Peter Collingbourne , Evgenii Stepanov , Branislav Rankov , Kevin Brodsky , kasan-dev@googlegroups.com, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrey Konovalov Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch reworks KASAN-KUnit tests for krealloc() to: 1. Check both slab and page_alloc based krealloc() implementations. 2. Allow at least one full granule to fit between old and new sizes for each KASAN mode, and check accesses to that granule accordingly. Signed-off-by: Andrey Konovalov --- lib/test_kasan.c | 91 ++++++++++++++++++++++++++++++++++++++++++------ 1 file changed, 81 insertions(+), 10 deletions(-) diff --git a/lib/test_kasan.c b/lib/test_kasan.c index 5699e43ca01b..2bb52853f341 100644 --- a/lib/test_kasan.c +++ b/lib/test_kasan.c @@ -258,11 +258,14 @@ static void kmalloc_large_oob_right(struct kunit *test) kfree(ptr); } -static void kmalloc_oob_krealloc_more(struct kunit *test) +static void krealloc_more_oob_helper(struct kunit *test, + size_t size1, size_t size2) { char *ptr1, *ptr2; - size_t size1 = 17; - size_t size2 = 19; + size_t middle; + + KUNIT_ASSERT_LT(test, size1, size2); + middle = size1 + (size2 - size1) / 2; ptr1 = kmalloc(size1, GFP_KERNEL); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); @@ -270,15 +273,31 @@ static void kmalloc_oob_krealloc_more(struct kunit *test) ptr2 = krealloc(ptr1, size2, GFP_KERNEL); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2); - KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size2 + OOB_TAG_OFF] = 'x'); + /* All offsets up to size2 must be accessible. */ + ptr2[size1 - 1] = 'x'; + ptr2[size1] = 'x'; + ptr2[middle] = 'x'; + ptr2[size2 - 1] = 'x'; + + /* Generic mode is precise, so unaligned size2 must be inaccessible. */ + if (IS_ENABLED(CONFIG_KASAN_GENERIC)) + KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size2] = 'x'); + + /* For all modes first aligned offset after size2 must be inaccessible. */ + KUNIT_EXPECT_KASAN_FAIL(test, + ptr2[round_up(size2, KASAN_GRANULE_SIZE)] = 'x'); + kfree(ptr2); } -static void kmalloc_oob_krealloc_less(struct kunit *test) +static void krealloc_less_oob_helper(struct kunit *test, + size_t size1, size_t size2) { char *ptr1, *ptr2; - size_t size1 = 17; - size_t size2 = 15; + size_t middle; + + KUNIT_ASSERT_LT(test, size2, size1); + middle = size2 + (size1 - size2) / 2; ptr1 = kmalloc(size1, GFP_KERNEL); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); @@ -286,10 +305,60 @@ static void kmalloc_oob_krealloc_less(struct kunit *test) ptr2 = krealloc(ptr1, size2, GFP_KERNEL); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2); - KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size2 + OOB_TAG_OFF] = 'x'); + /* Must be accessible for all modes. */ + ptr2[size2 - 1] = 'x'; + + /* Generic mode is precise, so unaligned size2 must be inaccessible. */ + if (IS_ENABLED(CONFIG_KASAN_GENERIC)) + KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size2] = 'x'); + + /* For all modes first aligned offset after size2 must be inaccessible. */ + KUNIT_EXPECT_KASAN_FAIL(test, + ptr2[round_up(size2, KASAN_GRANULE_SIZE)] = 'x'); + + /* + * For all modes both middle and size1 should land in separate granules + * and thus be inaccessible. + */ + KUNIT_EXPECT_LE(test, round_up(size2, KASAN_GRANULE_SIZE), + round_down(middle, KASAN_GRANULE_SIZE)); + KUNIT_EXPECT_LE(test, round_up(middle, KASAN_GRANULE_SIZE), + round_down(size1, KASAN_GRANULE_SIZE)); + KUNIT_EXPECT_KASAN_FAIL(test, ptr2[middle] = 'x'); + KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size1 - 1] = 'x'); + KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size1] = 'x'); + kfree(ptr2); } +static void krealloc_more_oob(struct kunit *test) +{ + krealloc_more_oob_helper(test, 201, 235); +} + +static void krealloc_less_oob(struct kunit *test) +{ + krealloc_less_oob_helper(test, 235, 201); +} + +static void krealloc_pagealloc_more_oob(struct kunit *test) +{ + /* page_alloc fallback in only implemented for SLUB. */ + KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB); + + krealloc_more_oob_helper(test, KMALLOC_MAX_CACHE_SIZE + 201, + KMALLOC_MAX_CACHE_SIZE + 235); +} + +static void krealloc_pagealloc_less_oob(struct kunit *test) +{ + /* page_alloc fallback in only implemented for SLUB. */ + KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB); + + krealloc_less_oob_helper(test, KMALLOC_MAX_CACHE_SIZE + 235, + KMALLOC_MAX_CACHE_SIZE + 201); +} + static void kmalloc_oob_16(struct kunit *test) { struct { @@ -983,8 +1052,10 @@ static struct kunit_case kasan_kunit_test_cases[] = { KUNIT_CASE(pagealloc_oob_right), KUNIT_CASE(pagealloc_uaf), KUNIT_CASE(kmalloc_large_oob_right), - KUNIT_CASE(kmalloc_oob_krealloc_more), - KUNIT_CASE(kmalloc_oob_krealloc_less), + KUNIT_CASE(krealloc_more_oob), + KUNIT_CASE(krealloc_less_oob), + KUNIT_CASE(krealloc_pagealloc_more_oob), + KUNIT_CASE(krealloc_pagealloc_less_oob), KUNIT_CASE(kmalloc_oob_16), KUNIT_CASE(kmalloc_uaf_16), KUNIT_CASE(kmalloc_oob_in_memset), -- 2.30.0.365.g02bc693789-goog