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=-20.9 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=ham 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 6A72FC47426 for ; Tue, 29 Sep 2020 13:39:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 166CA20848 for ; Tue, 29 Sep 2020 13:39:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="UOSBvRZB" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730213AbgI2NjQ (ORCPT ); Tue, 29 Sep 2020 09:39:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57302 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730122AbgI2NjE (ORCPT ); Tue, 29 Sep 2020 09:39:04 -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 B0EB8C0613D3 for ; Tue, 29 Sep 2020 06:39:02 -0700 (PDT) Received: by mail-qk1-x74a.google.com with SMTP id q131so2658616qke.22 for ; Tue, 29 Sep 2020 06:39:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:in-reply-to:message-id:mime-version:references:subject :from:to:cc; bh=vVOlNt/WCejDp1JOCEsvSSdVHILjJnc43Mcb0PKSl94=; b=UOSBvRZBZKrpnksJMXA3OOhNYA+IsYKy4qy9MiaMAWv4Qmco6I0lGG/1E1y4vY58vz CZBn6KJFIpSQPzI+0qHZF+n9AKpdnR1c/FcXU2vi9d6AcLaxN+0h2+6lKxpJ+VwD/Fb0 l3hIQBgDmYX4Qqem9eqXPEynllsNkpk/ipyQ/c4kOJwGgN0Mahu/+1w7p7blTpkFPPDH eBthRpEWp+J41zyd12Z9gm0BLrS+hsDfGa9rRHXKGig2x9ktsb/VO1/Z+5uzlxgK3Imv TxFCLtBlLbW0IQrbRuWQz26NF7uEVM4FpTthHS8NRQsg6B3mcVsX1dkd9vbBMEbwjd3+ Bw5A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=vVOlNt/WCejDp1JOCEsvSSdVHILjJnc43Mcb0PKSl94=; b=FY4ReoxcGnKBcC/nmzxVhOCOnZBjLPRTPbmX49T9F4EMqPmK6a4maFPiT/S8dktnHS vitJT7Dvs8PLyTHYY4qvFVfl3g7hbsLYOl+ESWFphzHlmk3jRNFePNzp/pJsFba19sP5 MI2/D5Dx4+0BB+UAPksCyH12gn6k0C6+P8Tuay7vlwB6ZXWfabKuHkqJv5opma+bRMZQ PxVpfxwaCsqA2sqLqBT7Bwisi5nL4TSqFs7w8qXhO++Ix4pHPX325NyLAr/tThuI0ac2 IldP6wguCorflDKJF+1GArtY5Db6D6lzVZfxOGX2202cb2+Ob6iZPKzAbJ538wa5iwu2 jaBA== X-Gm-Message-State: AOAM532XwzwGRvD9UOVI1okurYmCZN86tc0cdCDDr8JIi36/gWro7+Rh WoaE6qJukOOcT7oyB6WgOE7mYfzEhQ== X-Google-Smtp-Source: ABdhPJxPHumSkQ+1sRW54lJFlDtPVwTgrVQLDVfUTBhLd4jdPTbPDJavbzzqCAAj2yGSJ8AXrL9sZ4EW2w== Sender: "elver via sendgmr" X-Received: from elver.muc.corp.google.com ([2a00:79e0:15:13:f693:9fff:fef4:2449]) (user=elver job=sendgmr) by 2002:a0c:f6c4:: with SMTP id d4mr4373033qvo.41.1601386741788; Tue, 29 Sep 2020 06:39:01 -0700 (PDT) Date: Tue, 29 Sep 2020 15:38:11 +0200 In-Reply-To: <20200929133814.2834621-1-elver@google.com> Message-Id: <20200929133814.2834621-9-elver@google.com> Mime-Version: 1.0 References: <20200929133814.2834621-1-elver@google.com> X-Mailer: git-send-email 2.28.0.709.gb0816b6eb0-goog Subject: [PATCH v4 08/11] kfence, lockdep: make KFENCE compatible with lockdep From: Marco Elver To: elver@google.com, akpm@linux-foundation.org, glider@google.com Cc: hpa@zytor.com, paulmck@kernel.org, andreyknvl@google.com, aryabinin@virtuozzo.com, luto@kernel.org, bp@alien8.de, catalin.marinas@arm.com, cl@linux.com, dave.hansen@linux.intel.com, rientjes@google.com, dvyukov@google.com, edumazet@google.com, gregkh@linuxfoundation.org, hdanton@sina.com, mingo@redhat.com, jannh@google.com, Jonathan.Cameron@huawei.com, corbet@lwn.net, iamjoonsoo.kim@lge.com, keescook@chromium.org, mark.rutland@arm.com, penberg@kernel.org, peterz@infradead.org, sjpark@amazon.com, tglx@linutronix.de, vbabka@suse.cz, will@kernel.org, x86@kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Lockdep checks that dynamic key registration is only performed on keys that are not static objects. With KFENCE, it is possible that such a dynamically allocated key is a KFENCE object which may, however, be allocated from a static memory pool (if HAVE_ARCH_KFENCE_STATIC_POOL). Therefore, ignore KFENCE-allocated objects in static_obj(). Reviewed-by: Dmitry Vyukov Co-developed-by: Alexander Potapenko Signed-off-by: Alexander Potapenko Signed-off-by: Marco Elver --- kernel/locking/lockdep.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index 54b74fabf40c..0cf5d5ecbd31 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -38,6 +38,7 @@ #include #include #include +#include #include #include #include @@ -755,6 +756,13 @@ static int static_obj(const void *obj) if (arch_is_kernel_initmem_freed(addr)) return 0; + /* + * KFENCE objects may be allocated from a static memory pool, but are + * not actually static objects. + */ + if (is_kfence_address(obj)) + return 0; + /* * static variable? */ -- 2.28.0.709.gb0816b6eb0-goog