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, 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 72D91C43460 for ; Thu, 1 Apr 2021 23:32:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4B8DC6112D for ; Thu, 1 Apr 2021 23:32:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236303AbhDAXcz (ORCPT ); Thu, 1 Apr 2021 19:32:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50122 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236152AbhDAXck (ORCPT ); Thu, 1 Apr 2021 19:32:40 -0400 Received: from mail-qk1-x749.google.com (mail-qk1-x749.google.com [IPv6:2607:f8b0:4864:20::749]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 770C1C0613A9 for ; Thu, 1 Apr 2021 16:32:29 -0700 (PDT) Received: by mail-qk1-x749.google.com with SMTP id y9so4772967qki.14 for ; Thu, 01 Apr 2021 16:32:29 -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=PVR0PDKMcdICThtHzZ05IpjfNpdCKYkDS1ZQgOORGog=; b=tM0gdLvYYrIGSQ3UU73+aYUTVKUNIBmfBmMOkqL3kVYculPRqLzgjOxKi8RSH39BMa jniLnYQk3/+tuCi/WvnaKTWlkCsW1fENUR+FZ5btuwg0G2PF2KxdXxmwadid13ZqOvDZ rnAbh16KswUlnaQJtOdiTw8jRv8opl7cYS0NURIXgAwstF9yjXbgfTteqYONzG6n+08t qKrhi560aPcoh7IRXPd/rOy6M0hLASHhaPpvZ1DvsZiV91yOvz7u4r2xHuiyO7s4WLQK 1hCLqtc2RshinGwJtiZyyBClSa2dPX4j5ksIjHJxzt9tSnvJryiiPqFrpiL8tPgxVSFr cCkA== 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=PVR0PDKMcdICThtHzZ05IpjfNpdCKYkDS1ZQgOORGog=; b=QTuLlk83LZaPzsLxcC4MkPLJNMjqqhSe3MztCnwcKjmlLFOvlXOpaX78tknC8wZ717 3PDk7vygW8mEF6AyLxGp1Qkb6bdaNZRA/i+A8XVsOLOWMItI9Mk8LOjjqcMmtIuMW7ER 84sksHdJ2jriq336pNVtuzuY/OrD63cENAFjkIc+biFRE5iwH+QwiN0NsEvGgorg6/8J 8gtVG3m6xuQV5ZJElLtJcbI8vYYTdwbWvHJodJcEd4dd2vS/jpKEwVlyknK3V2+0sU0E 0g9CoAachIBChk9VZqN1eNYVnfdERT4OwQPMW6CP/bd+5RQ6IMHhsjYxcHYum/J0agGP CF/w== X-Gm-Message-State: AOAM532fF2FKO5F1JttC6xOPalk2MTjtoXgIzUA8i/h/MZQ6aZOtC2rG JqveFwIsPyhOXGuAfWJy4TcRy6XZvvzPHUSoeCQ= X-Google-Smtp-Source: ABdhPJz/GEAYNwZ86yFSuRvcWhakddiQDxgrF7XbdSdZeXfnn4teMz+Kc34ztrNSurf8c3YQYZvgWvRkfDCwo1+2V3U= X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:4cd1:da86:e91b:70b4]) (user=samitolvanen job=sendgmr) by 2002:a0c:d7d2:: with SMTP id g18mr10283542qvj.42.1617319948605; Thu, 01 Apr 2021 16:32:28 -0700 (PDT) Date: Thu, 1 Apr 2021 16:32:03 -0700 In-Reply-To: <20210401233216.2540591-1-samitolvanen@google.com> Message-Id: <20210401233216.2540591-6-samitolvanen@google.com> Mime-Version: 1.0 References: <20210401233216.2540591-1-samitolvanen@google.com> X-Mailer: git-send-email 2.31.0.208.g409f899ff0-goog Subject: [PATCH v5 05/18] 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 , Mark Rutland , Catalin Marinas , 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 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 __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)); -- 2.31.0.208.g409f899ff0-goog