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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4975FC47088 for ; Sat, 3 Dec 2022 02:38:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234697AbiLCCiF (ORCPT ); Fri, 2 Dec 2022 21:38:05 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55362 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235068AbiLCCiE (ORCPT ); Fri, 2 Dec 2022 21:38:04 -0500 Received: from mail-pl1-x634.google.com (mail-pl1-x634.google.com [IPv6:2607:f8b0:4864:20::634]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DC16DE02CA for ; Fri, 2 Dec 2022 18:38:02 -0800 (PST) Received: by mail-pl1-x634.google.com with SMTP id w23so6231672ply.12 for ; Fri, 02 Dec 2022 18:38:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=odrqLBAkmfFztXwXWAqVopowGGSKTPKe7S+AOTRL1ZQ=; b=PWjKyt2Kt/RRycNx6JJO2Pb9jWZ2WJmz6PjIJ0a4FvRuPtDJriT2OWOEx4kRCAfNE1 nU7sIkDzpgr6zEocy25DpzdzbHUEl1Mcv1P2zgEmUcZYmH+CHZcAkw0z723t6XLPEkRP vuCP4ewHulGyB/WHzahfjEFh8VGjAlWyQFWjM= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=odrqLBAkmfFztXwXWAqVopowGGSKTPKe7S+AOTRL1ZQ=; b=GyUjWehvXBFVJ3yLUqWG4bcMotsrPn97Nq1/j8WUdBiCtdAvAn0vCV3lRYcVu8G6dx gxoE2A0B7/oKRfHqUZCaeGZt5/qVURpBtIcj6pbjo9CV0uejuMYAjeTyIhDxbKRazX61 HA9sHyJk2x74eUbF3SWg4CT1TIkMqg6mGPGbDaqAjAnJmkQIpc3Y07hAiqV1XlOhnrfd HldAuYe3pMUw/9att9sDeQbFlpKYaYoiXSBXb9urP0HLIGFsUm0wtFmf/JdMLE3DAsaN rguiPoQtLj8piLHQMqBeUoJ1wvF8dgoqXzdZukX/N0qq027mvFfUQqoylJMqdC+ztc0V u8Dg== X-Gm-Message-State: ANoB5plA6BugeuGIU6P5FapDfKqjAjrOqQPjeiVKx06LqPZm/TZsclXR HoE7VE7gV0O0f+CtVfgyZoZALg== X-Google-Smtp-Source: AA0mqf53Z4Y94GBaMZbVdWNlK3xcI2XLN4/EsyZ8nzte608xXtTxzEMQopHQ1hnL/bUGWJP4cHGDzQ== X-Received: by 2002:a17:902:9a8a:b0:189:58a9:14a4 with SMTP id w10-20020a1709029a8a00b0018958a914a4mr44708547plp.18.1670035082380; Fri, 02 Dec 2022 18:38:02 -0800 (PST) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id x189-20020a6263c6000000b00575d6ec23f2sm5744951pfb.106.2022.12.02.18.38.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 02 Dec 2022 18:38:01 -0800 (PST) Date: Fri, 2 Dec 2022 18:38:01 -0800 From: Kees Cook To: Rick Edgecombe Cc: x86@kernel.org, "H . Peter Anvin" , Thomas Gleixner , Ingo Molnar , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, Arnd Bergmann , Andy Lutomirski , Balbir Singh , Borislav Petkov , Cyrill Gorcunov , Dave Hansen , Eugene Syromiatnikov , Florian Weimer , "H . J . Lu" , Jann Horn , Jonathan Corbet , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Peter Zijlstra , Randy Dunlap , Weijiang Yang , "Kirill A . Shutemov" , John Allen , kcc@google.com, eranian@google.com, rppt@kernel.org, jamorris@linux.microsoft.com, dethoma@microsoft.com, akpm@linux-foundation.org, Andrew.Cooper3@citrix.com, christina.schimpe@intel.com, Yu-cheng Yu Subject: Re: [PATCH v4 20/39] mm/mmap: Add shadow stack pages to memory accounting Message-ID: <202212021837.AACFC09F@keescook> References: <20221203003606.6838-1-rick.p.edgecombe@intel.com> <20221203003606.6838-21-rick.p.edgecombe@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20221203003606.6838-21-rick.p.edgecombe@intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-api@vger.kernel.org On Fri, Dec 02, 2022 at 04:35:47PM -0800, Rick Edgecombe wrote: > From: Yu-cheng Yu > > The x86 Control-flow Enforcement Technology (CET) feature includes a new > type of memory called shadow stack. This shadow stack memory has some > unusual properties, which requires some core mm changes to function > properly. > > Account shadow stack pages to stack memory. > > Tested-by: Pengfei Xu > Tested-by: John Allen > Signed-off-by: Yu-cheng Yu Reviewed-by: Kees Cook -- Kees Cook