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, URIBL_BLOCKED,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 1D744C433E9 for ; Thu, 14 Jan 2021 19:38:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DD4B62399C for ; Thu, 14 Jan 2021 19:38:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730166AbhANTiA (ORCPT ); Thu, 14 Jan 2021 14:38:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47014 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728380AbhANTh7 (ORCPT ); Thu, 14 Jan 2021 14:37:59 -0500 Received: from mail-qt1-x849.google.com (mail-qt1-x849.google.com [IPv6:2607:f8b0:4864:20::849]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B4B84C061795 for ; Thu, 14 Jan 2021 11:36:58 -0800 (PST) Received: by mail-qt1-x849.google.com with SMTP id h7so5305880qtn.21 for ; Thu, 14 Jan 2021 11:36:58 -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=ifrv61nnbwuahZCEiwjCwkZVX2MKhkqH/HoLspc9PnM=; b=svvurHrHAcNYd/CQpQXSFQuHa9Ng8oBiXsZOqVosLsBBpuko4Af8P7jmQDjInyf/fM DVIWn495lGvWTbxs+rpvrFbIHurmf+B/mdK1L18doOeUSBrUSD0brU/9kX/U1vm9qhJp kAs3xT0lWdqqiAiB5sVUJRyWfszLq7mO6QKFsTd+Xr0wyHtJBEs1Q/EsEtKybR9gotZ8 fjvT4ue9G6yBvYVXQR2ZABb8kp4QUr/3SMVaLi2E2Gy5DAeBAVyEav6RLmYpuLVm39iH eF8aJCJfYsIXVRHUQvFWd76xKwZHT8LIdDjWrMcFRwQSPDyVhguE8MAnZaOzY5p5g985 PCHg== 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=ifrv61nnbwuahZCEiwjCwkZVX2MKhkqH/HoLspc9PnM=; b=CwGQauauS+IGPhRmg28NDxuMej34unmPB7sfBXs3wgN7TpLJ7TzvNyKxWKOOKQ5fYT CVZbOlt1UGaEyVnMpmUXJvhwnil1gj/T++eHtBcK6SBlQLhskpdrOnlL+tZK119niPzQ 08SDbepexCityEcypGoAK1xLOQr+ODu15b+rsNJz2D8BPMF04n+aLcwt7EKHJzPDSKMm o3UxdQehpxwRGWIeMeXV17o9h3gOHrYeYHJeIrXEp8yRGnVZDvRNF4AvK+KsMBiGkZX8 GqE0TjufifJ0RI/sD5GZzHyIiL2+PvmUB+vN4zmg8rYumNyql6Gwza6sm/Uzw/wul+NX bPRw== X-Gm-Message-State: AOAM533ynMjEryOGbGrPwTw2jgSEsIU1XqOrD2eEvi3vICmSeJToCFUu ajwpCzCnHNC6FzKKWKzZ5owqazy/NArn2Phi X-Google-Smtp-Source: ABdhPJxsaB8DotGQxWble5pFmykfdTGG5ArjTFhmCqcwhqBIGlk7Tsyswg8ZcoX/blfWQVd4MH1EYIJAGkRqexxn 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:ad4:4c44:: with SMTP id cs4mr8625788qvb.25.1610653017877; Thu, 14 Jan 2021 11:36:57 -0800 (PST) Date: Thu, 14 Jan 2021 20:36:26 +0100 In-Reply-To: Message-Id: <5232775c82fe249ef3ec0a1e8470ec54eceb5002.1610652890.git.andreyknvl@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.30.0.284.gd98b1dd5eaa7-goog Subject: [PATCH v3 10/15] kasan: fix memory corruption in kasan_bitops_tags test From: Andrey Konovalov To: Andrew Morton , Catalin Marinas , Vincenzo Frascino , Dmitry Vyukov , Alexander Potapenko , Marco Elver Cc: 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 Since the hardware tag-based KASAN mode might not have a redzone that comes after an allocated object (when kasan.mode=prod is enabled), the kasan_bitops_tags() test ends up corrupting the next object in memory. Change the test so it always accesses the redzone that lies within the allocated object's boundaries. Link: https://linux-review.googlesource.com/id/I67f51d1ee48f0a8d0fe2658c2a39e4879fe0832a Reviewed-by: Marco Elver Reviewed-by: Alexander Potapenko Signed-off-by: Andrey Konovalov --- lib/test_kasan.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/lib/test_kasan.c b/lib/test_kasan.c index 0cda4a1ff394..a06e7946f581 100644 --- a/lib/test_kasan.c +++ b/lib/test_kasan.c @@ -749,13 +749,13 @@ static void kasan_bitops_tags(struct kunit *test) /* This test is specifically crafted for tag-based modes. */ KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC); - /* Allocation size will be rounded to up granule size, which is 16. */ - bits = kzalloc(sizeof(*bits), GFP_KERNEL); + /* kmalloc-64 cache will be used and the last 16 bytes will be the redzone. */ + bits = kzalloc(48, GFP_KERNEL); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, bits); - /* Do the accesses past the 16 allocated bytes. */ - kasan_bitops_modify(test, BITS_PER_LONG, &bits[1]); - kasan_bitops_test_and_modify(test, BITS_PER_LONG + BITS_PER_BYTE, &bits[1]); + /* Do the accesses past the 48 allocated bytes, but within the redone. */ + kasan_bitops_modify(test, BITS_PER_LONG, (void *)bits + 48); + kasan_bitops_test_and_modify(test, BITS_PER_LONG + BITS_PER_BYTE, (void *)bits + 48); kfree(bits); } -- 2.30.0.284.gd98b1dd5eaa7-goog