From patchwork Wed Mar 31 21:27:09 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 12176433 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 7C335C4363C for ; Wed, 31 Mar 2021 21:28:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3E4E461073 for ; Wed, 31 Mar 2021 21:28:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232532AbhCaV2P (ORCPT ); Wed, 31 Mar 2021 17:28:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51782 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229486AbhCaV1g (ORCPT ); Wed, 31 Mar 2021 17:27:36 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6583CC0613DF for ; Wed, 31 Mar 2021 14:27:34 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id l83so3642032ybf.22 for ; Wed, 31 Mar 2021 14:27:34 -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=83qC35j0sT8ux3EecZ4JSXTBbnC5lT5vvU8jPpy+oIo=; b=qW9htz+1Xajlr5ZlOCWPOGJSyd0/TSkn9e+fyiCr0KHqJua+AlwezhJkvGAUtb8Uus /S4mbwz/r+yDh70gtjVoZeS/Cd8Df/jmcs1PuDY46slrmp+4SqG+psUv2O+ksbCIJsku dIjxKPRi0/bBYhrdnimd0IFEXoBehXd1rxYwYKk6jnrMrv5BJOu5sLPElKsXeAOfL2IR FSzBya2A/E7j+p3qdkcoVeUbSlTHPrCr/FWByGn48UAf6x3/qZaErXzEP1jQigQ+9zTl SKBo2HTMUqAJmQOe4IT5KuTYEDd90h1ZV8EwZpReysv+MJnRxHy6JXArwTScE9I12WVL 7/4Q== 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=83qC35j0sT8ux3EecZ4JSXTBbnC5lT5vvU8jPpy+oIo=; b=SjDfa9QIDCedIqOXvCOv39ehH8ZWQRwprQu983yaWGBIfdQG+ncY3VTKIwHmNWM0OK +Lt5z4fjMQGbp5VVHXmFOogJAnsYAZBxIu495S4UyjOqrBxHW2PlVCfNcdgXr9g70SHH R6G9eA9zfAOIAm7HHrGuGMDr8gH7C+KThpIBPBS5ynP4EJAeKWA9wWCg+rfUtPFIucjD TbvMnht3WqISOluuj4uoYaFxNgQil+eAgnnega7NtBpRgco38Gn5qKPSu7kd9S0vVS5a Ny3WJB9j7EbcRMLI596lIOuXMRX0GAd/84TZsrgXSh4KuGb87Q32JdGsG/eHWQ5jVHeO o5Sw== X-Gm-Message-State: AOAM533k72VQXUWOtV7jAH2qZQLVaS4W6MBXJAHsA7h1uVaLkH6AT8EE FBgMEcC+GjLYlcdwIJplj6JwPf3MsF22inUEGPc= X-Google-Smtp-Source: ABdhPJyr002SQuA6HZqmBTDomHGBVa4bvwCOQ/KoKLmk8qBxdNaaMWAdSxUHR/bPNxVIO6iowtKoA+CrI/FQIGDGCn4= X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:7933:7015:a5d5:3835]) (user=samitolvanen job=sendgmr) by 2002:a25:3801:: with SMTP id f1mr7850920yba.353.1617226053546; Wed, 31 Mar 2021 14:27:33 -0700 (PDT) Date: Wed, 31 Mar 2021 14:27:09 -0700 In-Reply-To: <20210331212722.2746212-1-samitolvanen@google.com> Message-Id: <20210331212722.2746212-6-samitolvanen@google.com> Mime-Version: 1.0 References: <20210331212722.2746212-1-samitolvanen@google.com> X-Mailer: git-send-email 2.31.0.291.g576ba9dcdaf-goog Subject: [PATCH v4 05/17] workqueue: 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 , Sedat Dilek , 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, clang-built-linux@googlegroups.com, Sami Tolvanen Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org With CONFIG_CFI_CLANG, a callback function passed to __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 != 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/workqueue.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 0d150da252e8..03fe07d2f39f 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -1630,7 +1630,7 @@ static void __queue_delayed_work(int cpu, struct workqueue_struct *wq, struct work_struct *work = &dwork->work; WARN_ON_ONCE(!wq); - WARN_ON_ONCE(timer->function != delayed_work_timer_fn); + WARN_ON_FUNCTION_MISMATCH(timer->function, delayed_work_timer_fn); WARN_ON_ONCE(timer_pending(timer)); WARN_ON_ONCE(!list_empty(&work->entry));