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 8D7E1C4363C for ; Tue, 23 Mar 2021 20:41:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7CF47619EC for ; Tue, 23 Mar 2021 20:41:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233454AbhCWUks (ORCPT ); Tue, 23 Mar 2021 16:40:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44912 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233473AbhCWUj7 (ORCPT ); Tue, 23 Mar 2021 16:39:59 -0400 Received: from mail-qk1-x74a.google.com (mail-qk1-x74a.google.com [IPv6:2607:f8b0:4864:20::74a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D7745C061764 for ; Tue, 23 Mar 2021 13:39:58 -0700 (PDT) Received: by mail-qk1-x74a.google.com with SMTP id k188so139827qkb.5 for ; Tue, 23 Mar 2021 13:39:58 -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=EKy6eSpRty5bSmZbwR30NkKAGzsTESRLoXrAS0NLKzs=; b=SHiuDwK39cZpUPhp4hdoHOuGGDuRvdgVruquA5OhzT20BoTxNAsr9v4IssAUSm++Wu Gdigd5fbbNiaLy/ry4ApwbLMVFLE/K8FS9T8hHmeF+HMjwCwC1pX53Mm0BNeat42pW6A vudqk7VvICGdH7ZzkH/77tQzcGfMs8BokGif9s1iaTr4/OXPToVBkScJWmDX17YliXvx qqE/rODtG05P0dv7CE4/9UcCl0G27AKyydISoJgw84bjphFaaOWXGCFldHhaDhA0vXjv 6uLVLqt6EaTZd1uB/NSBl+SDtBiFuBudKFH8Sf5XHxGzWkbtxux1it75UPI4B3F4MoBR bzIw== 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=EKy6eSpRty5bSmZbwR30NkKAGzsTESRLoXrAS0NLKzs=; b=cBxXdmKMOxJwtpz2UxBasNL0l5tgXQyIQ7ln+V9QBr9UDYQOqTCttWBUDggXK4QZsY Qi8JCTntvnPE2Yc2qJQT+NisdA+X96t5fj/dDtDt8GvNqFvhrzKDmRjZYEbsliniw5a0 4sEjM/duvAbNn7MXhCvOI8sfZNzdINc4VbCBr+Lk1shfZQZqpbA97fiDFNub855FdE0C gKUUAqv8Ka0dS/9wKnJQwgfV2/gNIA4aPhblGh8HBOB0NH6CiGKyZKe3oLVCI8fHMKlp z+ll57D+ZWmDZw1RgGjCKghJSZ8w8f2zLun1J95EFfVRUQDh4o/UnilY9gsYj/VVrRCE z9GA== X-Gm-Message-State: AOAM531V4DkYR+BkBasH3Iv2jO471MGCx5+eqwsz3tKojuB05TeSGmXF wIb2c8vkI9RzwRMDNQhiGT0D+PurCe689+fOdfo= X-Google-Smtp-Source: ABdhPJzHeOXxkC8OlUHUZt0DqSgHN9t2rhpi+pE22x1dKho2TmMlfck6McMlcAxQskeb4L29PcbGG9gfenN7WPTbeOU= X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:e9a3:260d:763b:67dc]) (user=samitolvanen job=sendgmr) by 2002:ad4:5887:: with SMTP id dz7mr198051qvb.12.1616531998043; Tue, 23 Mar 2021 13:39:58 -0700 (PDT) Date: Tue, 23 Mar 2021 13:39:34 -0700 In-Reply-To: <20210323203946.2159693-1-samitolvanen@google.com> Message-Id: <20210323203946.2159693-6-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 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 , 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-hardening@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 --- 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)); -- 2.31.0.291.g576ba9dcdaf-goog