From patchwork Tue Mar 23 20:39:35 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 12159261 X-Patchwork-Delegate: kuba@kernel.org 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 3BC06C433E2 for ; Tue, 23 Mar 2021 20:41:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1B3C9619BA for ; Tue, 23 Mar 2021 20:41:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233599AbhCWUkd (ORCPT ); Tue, 23 Mar 2021 16:40:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44946 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233438AbhCWUkB (ORCPT ); Tue, 23 Mar 2021 16:40:01 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 99E84C0613DF for ; Tue, 23 Mar 2021 13:40:00 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id u128so3794668ybf.12 for ; Tue, 23 Mar 2021 13:40:00 -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=obb/St0ECVpiVYPjl0tFmSeAu+nwHW6a+FyVf5Y93kL0zciJ7OpXo5pz5/5qK+sMFf HVCB7lPNLLCcgrreAMPMIq89DUCTawBOwNPUPSIBya5VRwan8cbfXQx100+5xN/Qkd+t DrRy/pbSThpGxZ1QzI4eyYQAJqKt5nt14oxKeAqxjwjAb66eROjyJZpq+iXVKnIt1UeO qE3Het9/jgbk33l/79gSOA0M2UKmfHun8/qcQ5XwaA/WAB2nFQGlLlfTzyIcIhj7o/5V IAm35WHoPPYpvmYzDW1CTc/YgvwTLIfoZ+x6jtjFf4U8j7x1w0Jt0fXDFRfY/dN/7g6Y zgEA== 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=hcRlyVR/yKi95OEN6qmH2+HnRrCySEOg1wIP47UZj2OtV67FaSLDdW/n9m8O2lVOLV m4czLbBcx8nfc0xkGeszPb9s3aDiGxqh3zlGZQdds86tSbuNQZ6ZprlZeyVqxRTUmYuU EObqjSms06hxWz/xgRCbvw15GYLzxWrFGjrHmBCLDTYy21cRGcQpz26mOv9BwrYVNySs sdEh/1T1zFPA90MWRgBxIGhbJvZ31qk5zSUQTJnHEw5owXr291UDctYUnIopSZ4gZX0t ZnCIGxU2oKleF9r3zWluHPV1orVDzWmKyzdipzrbGHAsUYDOPsg0VNMh79CIqQIHxI1Y vopQ== X-Gm-Message-State: AOAM531aJpaHBHz8W0mjAJ4q1OzrraKg0tqZBuCI1gN2bicq2mB8Bf7i ORBNESGbrw1RlUAR6wZz17mw+2fKNTmZZOHvlWQ= X-Google-Smtp-Source: ABdhPJy06lzastyLa7rjZrqrKe8Kw6vypE8VYVF9BzE0zOiJRLohmqAfcSnsVJk7XWpS4yGsr/w/V3cRXxwJCIzEtGs= X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:e9a3:260d:763b:67dc]) (user=samitolvanen job=sendgmr) by 2002:a25:e008:: with SMTP id x8mr147121ybg.90.1616531999835; Tue, 23 Mar 2021 13:39:59 -0700 (PDT) Date: Tue, 23 Mar 2021 13:39:35 -0700 In-Reply-To: <20210323203946.2159693-1-samitolvanen@google.com> Message-Id: <20210323203946.2159693-7-samitolvanen@google.com> Mime-Version: 1.0 References: <20210323203946.2159693-1-samitolvanen@google.com> X-Mailer: git-send-email 2.31.0.291.g576ba9dcdaf-goog Subject: [PATCH v3 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 , Peter Zijlstra , 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 Precedence: bulk List-ID: X-Mailing-List: bpf@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 Reviewed-by: Kees Cook --- 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