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 5FB0FC388F7 for ; Tue, 3 Nov 2020 22:17:57 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 08ED722464 for ; Tue, 3 Nov 2020 22:17:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="Syi5K4Qt" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 08ED722464 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 8A8436B006E; Tue, 3 Nov 2020 17:17:56 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 857CB6B0070; Tue, 3 Nov 2020 17:17:56 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6D51A6B0071; Tue, 3 Nov 2020 17:17:56 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0185.hostedemail.com [216.40.44.185]) by kanga.kvack.org (Postfix) with ESMTP id 358DD6B006E for ; Tue, 3 Nov 2020 17:17:56 -0500 (EST) Received: from smtpin26.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id D04291EF1 for ; Tue, 3 Nov 2020 22:17:55 +0000 (UTC) X-FDA: 77444520510.26.fan38_2c11a2d272bc Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin26.hostedemail.com (Postfix) with ESMTP id AFB171804B655 for ; Tue, 3 Nov 2020 22:17:55 +0000 (UTC) X-HE-Tag: fan38_2c11a2d272bc X-Filterd-Recvd-Size: 4888 Received: from mail-lj1-f194.google.com (mail-lj1-f194.google.com [209.85.208.194]) by imf27.hostedemail.com (Postfix) with ESMTP for ; Tue, 3 Nov 2020 22:17:55 +0000 (UTC) Received: by mail-lj1-f194.google.com with SMTP id p15so20823763ljj.8 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=CJE8d+1q02CrcRcvM0j3gbWnSpDsPyNOBXgZOElRAdEEqBA6wTK9fMBpG+FckAzqV1 o5hSW8o7U+PisrFY6wBh2CrbJM/1t3Zsu82tZANE1YPOcXYDj9mwbFgrPVefOJtQGrhG bkpudKR7WBmnOdLvWuuK/FC+qJwuPSchNw0+gBXJ5iyfEFvb/SxaBMG510eNQ1GjU2Y1 IjlKRzGWvnWC2ik7Bsz1j4O4M10bYiY3GQPkq6kYd8y0y+dnW6fheZ+ld80rJjLa0lmu 6W8Iaqc9/vKrOCGH9UH5JBrdnHlHxV3bjF9b/jrm+oKb6bxnv+8OOZFbs9tsQQH1gd4l fQtQ== X-Gm-Message-State: AOAM530PHyFrDGUMvG1ylo+wInT1zEQcCBZSTGP/kgxy10AoDZoE14dS /tozQuJn6SvlX57u2b+rRxpivuRtjaFC/P4eObygiQ== 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" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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