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=-16.4 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,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 9B545C48BD6 for ; Thu, 27 Jun 2019 09:45:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6FFDC2083B for ; Thu, 27 Jun 2019 09:45:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="J0Ci+Hl2" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726590AbfF0JpQ (ORCPT ); Thu, 27 Jun 2019 05:45:16 -0400 Received: from mail-yb1-f201.google.com ([209.85.219.201]:51144 "EHLO mail-yb1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726498AbfF0JpO (ORCPT ); Thu, 27 Jun 2019 05:45:14 -0400 Received: by mail-yb1-f201.google.com with SMTP id v83so3242008ybv.17 for ; Thu, 27 Jun 2019 02:45:13 -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=/Bjb3ErsQTLw+YrlSLkjBcr6K+fvu3f9fORDBwR/vbU=; b=J0Ci+Hl2dklL61XlDu+L7c3zA5n+Cr6/DaQOIbrhOtnPcC74yySQ+I5nkFakrDmsxW 4bi1Q4JaIWXmIUOCc4DIdh/ds39jpfRXGtDW6mU0xdjNAlM9Jda9tH6hbUAdTGAZEeX8 49vYKspcn666nQb3sq8SwovKzlb21N9T7d8GljQX+tyOtgPUiOjtZI/gKE936+eoqNHx rxxaGWQaPKCugOiKAzguIJfywBy0nNvgisRy5RigGtGBtBdfJH3TJYPgtpjGV0zoyJTK ZjYB1aD0xLPDgs/tqbM7lVH6PjLItziSxZ1iovnz/Tq5P9P4Rc8eKOb7vfjUUS6OEaiR c5iQ== 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=/Bjb3ErsQTLw+YrlSLkjBcr6K+fvu3f9fORDBwR/vbU=; b=Q4HsObcTxK7/wasNJR4bMQm/qAkiW+WU/uDIWRQ5t0Ox2WK2E4+AAxnbkIkpMJCW8m oai6LnfDn2H9KrEzgCX6wXZ3CXkEhpcLwsn32iZyN5VZvFdSQ0ooVhLlFpXvNlwaBfim CyKJO07oopUbCLCRVSP7zfKV/kqWP07abzQzX2NiGDYdnf4LSYo/BxgbtZLU7es0U7J0 2bPBNmviqmFVwiUws81CAtCBsyKlaRBcFmBKIrbEr1fTPAYlQyIDECeFkMOUZ2ef6rU6 eBQMIaDc85Y4YsH8aL5yvaywclVoOxmsPMIz4gUlDdDMesAr/Rnnk5woIzKyRU0T1zXs uopw== X-Gm-Message-State: APjAAAUVYWQvJE72uM5CxIzp1A8jn8437HzAtiWPGvNZp+DyOQT7jPT+ BYuPJz3wn2b6lAY6MxwLzRRrx/PYHQ== X-Google-Smtp-Source: APXvYqzrzpOQbBKJXfxXILWs07ouSrOOgu0C1a7VRkp0utCzl0DRrXpztivBKMFnbS0DUZY3rM1cYhRiLQ== X-Received: by 2002:a25:9a44:: with SMTP id r4mr1814342ybo.393.1561628713265; Thu, 27 Jun 2019 02:45:13 -0700 (PDT) Date: Thu, 27 Jun 2019 11:44:43 +0200 In-Reply-To: <20190627094445.216365-1-elver@google.com> Message-Id: <20190627094445.216365-4-elver@google.com> Mime-Version: 1.0 References: <20190627094445.216365-1-elver@google.com> X-Mailer: git-send-email 2.22.0.410.gd8fdbe21b5-goog Subject: [PATCH v4 3/5] lib/test_kasan: Add test for double-kzfree detection From: Marco Elver To: elver@google.com Cc: linux-kernel@vger.kernel.org, Andrey Ryabinin , Dmitry Vyukov , Alexander Potapenko , Andrey Konovalov , Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Andrew Morton , Mark Rutland , kasan-dev@googlegroups.com, linux-mm@kvack.org Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Adds a simple test that checks if double-kzfree is being detected correctly. Signed-off-by: Marco Elver Cc: Andrey Ryabinin Cc: Dmitry Vyukov Cc: Alexander Potapenko Cc: Andrey Konovalov Cc: Christoph Lameter Cc: Pekka Enberg Cc: David Rientjes Cc: Joonsoo Kim Cc: Andrew Morton Cc: Mark Rutland Cc: kasan-dev@googlegroups.com Cc: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org --- lib/test_kasan.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/lib/test_kasan.c b/lib/test_kasan.c index e3c593c38eff..dda5da9f5bd4 100644 --- a/lib/test_kasan.c +++ b/lib/test_kasan.c @@ -619,6 +619,22 @@ static noinline void __init kasan_strings(void) strnlen(ptr, 1); } +static noinline void __init kmalloc_double_kzfree(void) +{ + char *ptr; + size_t size = 16; + + pr_info("double-free (kzfree)\n"); + ptr = kmalloc(size, GFP_KERNEL); + if (!ptr) { + pr_err("Allocation failed\n"); + return; + } + + kzfree(ptr); + kzfree(ptr); +} + static int __init kmalloc_tests_init(void) { /* @@ -660,6 +676,7 @@ static int __init kmalloc_tests_init(void) kasan_memchr(); kasan_memcmp(); kasan_strings(); + kmalloc_double_kzfree(); kasan_restore_multi_shot(multishot); -- 2.22.0.410.gd8fdbe21b5-goog