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 A6745C2BBD4 for ; Thu, 18 Mar 2021 17:12:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6052D64F81 for ; Thu, 18 Mar 2021 17:12:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232430AbhCRRLu (ORCPT ); Thu, 18 Mar 2021 13:11:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33224 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232308AbhCRRL3 (ORCPT ); Thu, 18 Mar 2021 13:11:29 -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 76438C06175F for ; Thu, 18 Mar 2021 10:11:29 -0700 (PDT) Received: by mail-pg1-x549.google.com with SMTP id r1so2846305pgg.12 for ; Thu, 18 Mar 2021 10:11:29 -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=kAxWBGQQ6gb1U0MwyH2aGrnOUTzFGjVGvgXGkxVH/cc=; b=liAOU1cNxrOdNR8Mq2wdteZcuX/4GGjEvmX6VRt8SJpT8g5c/zhTtCrqOcNoXot7R8 p1HymEJCx3U3MjDN37R8LlebJ9vtc4QS37r5hp/DGkgrykkjdb6C0qRALyJRp89Eas+i 1jen8r3xd9zt0zZr9UzvlAfpmAxoBZYbpK/OgNk6ZT++341DfmQovKhP11YgxnbvZlFr X2tspDFVyGouwBpmAV27otQ74JTSYb7fKQKADR7cZWYj2chJWJ1DBwJw5EPogGOtdPZa AwlGuQfVzacKapISpv2yS7Uq+JqnRv+I7YVKuASx+mIC9EZrru5DgEP2qNx7a2dWt6C4 aL+g== 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=kAxWBGQQ6gb1U0MwyH2aGrnOUTzFGjVGvgXGkxVH/cc=; b=dm5CV05TOhp1MDjmHTTIe460KrrVwLiRFSX0cPyBs33fCm66TI84aasQoUOUd9vdj1 szJfCcE84YjMSsz9HF1o9Hd7OuBKx8UsAkacficfcS4YNbV4Zy+9Y2lyWSVz68iYBENm c8stWRxViFBh0g5HNIYtrwuombGbTtmH7qBda52c3qGSJqbPJXxP1+M6F9Ee2RcjZnwk gaUVDntw+FiWCp383XcXi73EGLDeZF9WWPISQspFCJpyCetS424JnSme+CtyPmpJKROJ QVPBpeaY/e4/BoLgQQqKXWUHDXXJbqLX343NYDJZz7w/EJH8UQfjLG9o4ma96r3tzAx7 n0dw== X-Gm-Message-State: AOAM531LvLNV9g4NO0h9kzqz5tqS//PwwgLf/hjcAijxX392o8wiGplO LWUeKpbEuQtrTWtnp74XOFC7EqvqMJ8HKZa+1Ds= X-Google-Smtp-Source: ABdhPJxKWbdiJmcD8GxmltL5n/GfUdjB9vzaW7o7vy1vsfJ4+SqraPewncqhBQztkA9cts228yKyAQm40viIg6HomOI= X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:c0d7:a7ba:fb41:a35a]) (user=samitolvanen job=sendgmr) by 2002:a17:90a:b311:: with SMTP id d17mr5522830pjr.228.1616087488845; Thu, 18 Mar 2021 10:11:28 -0700 (PDT) Date: Thu, 18 Mar 2021 10:11:00 -0700 In-Reply-To: <20210318171111.706303-1-samitolvanen@google.com> Message-Id: <20210318171111.706303-7-samitolvanen@google.com> Mime-Version: 1.0 References: <20210318171111.706303-1-samitolvanen@google.com> X-Mailer: git-send-email 2.31.0.291.g576ba9dcdaf-goog Subject: [PATCH v2 06/17] kthread: use WARN_ON_FUNCTION_MISMATCH From: Sami Tolvanen To: Kees Cook Cc: Nathan Chancellor , Nick Desaulniers , Masahiro Yamada , Will Deacon , Jessica Yu , Arnd Bergmann , Tejun Heo , "Paul E. McKenney" , Christoph Hellwig , bpf@vger.kernel.org, linux-hardening@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kbuild@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Sami Tolvanen Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org With CONFIG_CFI_CLANG, a callback function passed to __kthread_queue_delayed_work from a module points to a jump table entry defined in the module instead of the one used in the core kernel, which breaks function address equality in this check: WARN_ON_ONCE(timer->function != ktead_delayed_work_timer_fn); Use WARN_ON_FUNCTION_MISMATCH() instead to disable the warning when CFI and modules are both enabled. Signed-off-by: Sami Tolvanen --- kernel/kthread.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/kthread.c b/kernel/kthread.c index 1578973c5740..a1972eba2917 100644 --- a/kernel/kthread.c +++ b/kernel/kthread.c @@ -963,7 +963,8 @@ static void __kthread_queue_delayed_work(struct kthread_worker *worker, struct timer_list *timer = &dwork->timer; struct kthread_work *work = &dwork->work; - WARN_ON_ONCE(timer->function != kthread_delayed_work_timer_fn); + WARN_ON_FUNCTION_MISMATCH(timer->function, + kthread_delayed_work_timer_fn); /* * If @delay is 0, queue @dwork->work immediately. This is for -- 2.31.0.291.g576ba9dcdaf-goog