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=-14.4 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL autolearn=no 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 0AA74C388F9 for ; Tue, 3 Nov 2020 22:18:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BC24A223AC for ; Tue, 3 Nov 2020 22:18:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="Syi5K4Qt" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730025AbgKCWSG (ORCPT ); Tue, 3 Nov 2020 17:18:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36016 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729986AbgKCWR5 (ORCPT ); Tue, 3 Nov 2020 17:17:57 -0500 Received: from mail-lj1-x241.google.com (mail-lj1-x241.google.com [IPv6:2a00:1450:4864:20::241]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6FBACC0613D1 for ; Tue, 3 Nov 2020 14:17:55 -0800 (PST) Received: by mail-lj1-x241.google.com with SMTP id d24so20740332ljg.10 for ; Tue, 03 Nov 2020 14:17:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=YdCtwbqMAyOyGH0CTbWZbzS3jok6JKd1ti4BRTFY2CQ=; b=Syi5K4QtbQmsVKQreoJMI67JfTtNeBwyJGgNHs5/l8LirTZcgUymPH9ZkuqsuVoHSi njcQFA+9ndjY5DFHyaiesqLCeohkhCicpG1nFs6yGRNWFYI4nQ1M+/Rw/DKpaaN/6EHw 3IrihZljAgYQ8fefQ9BNL0kAqXdeNfodiarJ9DcqXAKdYjvirhsQCCYuX/6RG3WJ6BfI DdB0unYf1/rAkex2nEfEiHVr4WvG6VG/GY6wuiaR0DN0xBHChJbby3VHhAvCHEOIhgtx CeS8hL24PxrffNrhqJIWIu04krjnKPFLTcqqau7BBAJXLtHfU16GwFapDDmMlwFe/eYd N2XQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=YdCtwbqMAyOyGH0CTbWZbzS3jok6JKd1ti4BRTFY2CQ=; b=MgaDI4DeM1zsVGIWcsZDgdFhQkZidH3/3aUjK6XEAQmxKQYLHSlM9bhrTS4K0h4pGo Xak6/HQr/RWwf/n2jGMO0SMCA0xP8o64tP6vNNwKx55aOkhktw46o2RE/aXDS8Hxbb98 4Pf+bM8iya/nyO7LygJXPaEtgohcWOr7qOFnl2rZ39FgRNmGJQ396jcANQu0QYnHLO7O xefh/vQerOGFnxdQe/g4L7pzMp8LI/Y4DtNDEJxGuE+kFUwsSZk82U41g2Uhor1nWiEX UTXD3u+VUXCdgkUpwdj8nLD6wEPYWyZBE/ocUpEQ/J5zVNT0DXHYiWurFw88cRsKr76i KjkQ== X-Gm-Message-State: AOAM533T4Ycj1nLZQjfvRXGPyr5+99SY8XAiYOewV4vr2QTayVv+JUAR dw9DQvcnP0dF0AHuje7J+DWT3X0Oanbrq8GTWZ1Qdg== X-Google-Smtp-Source: ABdhPJwqqJGhaA3LrQ9gKploTm4XfKyPF3dSnpWL5/VLaLkfLNDvHlDSES6Yl3ycBU489bw5LRJA3NvGR8tWbXI9tYE= X-Received: by 2002:a2e:8816:: with SMTP id x22mr8822321ljh.377.1604441873724; Tue, 03 Nov 2020 14:17:53 -0800 (PST) MIME-Version: 1.0 References: <20201103175841.3495947-1-elver@google.com> <20201103175841.3495947-4-elver@google.com> In-Reply-To: <20201103175841.3495947-4-elver@google.com> From: Jann Horn Date: Tue, 3 Nov 2020 23:17:26 +0100 Message-ID: Subject: Re: [PATCH v7 3/9] arm64, kfence: enable KFENCE for ARM64 To: Marco Elver Cc: Andrew Morton , Alexander Potapenko , "H . Peter Anvin" , "Paul E . McKenney" , Andrey Konovalov , Andrey Ryabinin , Andy Lutomirski , Borislav Petkov , Catalin Marinas , Christoph Lameter , Dave Hansen , David Rientjes , Dmitry Vyukov , Eric Dumazet , Greg Kroah-Hartman , Hillf Danton , Ingo Molnar , Jonathan Cameron , Jonathan Corbet , Joonsoo Kim , =?UTF-8?Q?J=C3=B6rn_Engel?= , Kees Cook , Mark Rutland , Pekka Enberg , Peter Zijlstra , SeongJae Park , Thomas Gleixner , Vlastimil Babka , Will Deacon , "the arch/x86 maintainers" , "open list:DOCUMENTATION" , kernel list , kasan-dev , Linux ARM , Linux-MM Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Nov 3, 2020 at 6:59 PM Marco Elver wrote: > Add architecture specific implementation details for KFENCE and enable > KFENCE for the arm64 architecture. In particular, this implements the > required interface in . > > KFENCE requires that attributes for pages from its memory pool can > individually be set. Therefore, force the entire linear map to be mapped > at page granularity. Doing so may result in extra memory allocated for > page tables in case rodata=full is not set; however, currently > CONFIG_RODATA_FULL_DEFAULT_ENABLED=y is the default, and the common case > is therefore not affected by this change. > > Reviewed-by: Dmitry Vyukov > Co-developed-by: Alexander Potapenko > Signed-off-by: Alexander Potapenko > Signed-off-by: Marco Elver Reviewed-by: Jann Horn