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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 78263C4321E for ; Sat, 3 Dec 2022 02:38:04 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 15E6E6B007B; Fri, 2 Dec 2022 21:38:04 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 0E8036B0080; Fri, 2 Dec 2022 21:38:04 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id EA42E6B0081; Fri, 2 Dec 2022 21:38:03 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id DDD7B6B007B for ; Fri, 2 Dec 2022 21:38:03 -0500 (EST) Received: from smtpin11.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id A6DB716076C for ; Sat, 3 Dec 2022 02:38:03 +0000 (UTC) X-FDA: 80199435246.11.8630F3E Received: from mail-pl1-f178.google.com (mail-pl1-f178.google.com [209.85.214.178]) by imf11.hostedemail.com (Postfix) with ESMTP id 53C6E40008 for ; Sat, 3 Dec 2022 02:38:03 +0000 (UTC) Authentication-Results: imf11.hostedemail.com; dkim=pass header.d=chromium.org header.s=google header.b=PWjKyt2K; spf=pass (imf11.hostedemail.com: domain of keescook@chromium.org designates 209.85.214.178 as permitted sender) smtp.mailfrom=keescook@chromium.org; dmarc=pass (policy=none) header.from=chromium.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1670035083; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=odrqLBAkmfFztXwXWAqVopowGGSKTPKe7S+AOTRL1ZQ=; b=ty7DUiITCwcahh05Nx83CrPw2PITC67+r5gCbi9HX2qCyEX/A2jG7Ifv0qQr2JgSwE2hb1 XRya/04PDhASZVWseuBv9jo1nt55Ae2VKQ5UWEJ7mBWwYCk098n1QaU9qPy57B3fgxacEs 8MtAd9ymrks3DWFtNkJpQ6grNZJ+XTo= ARC-Authentication-Results: i=1; imf11.hostedemail.com; dkim=pass header.d=chromium.org header.s=google header.b=PWjKyt2K; spf=pass (imf11.hostedemail.com: domain of keescook@chromium.org designates 209.85.214.178 as permitted sender) smtp.mailfrom=keescook@chromium.org; dmarc=pass (policy=none) header.from=chromium.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1670035083; a=rsa-sha256; cv=none; b=HcmThQe/aFx96IXIE4XEXEXXSIXTqfyLQ/KvDssot/TFML6ABDwL6QQIuWYtuNXIzYO2hJ 2chEAesl/p77wIRyZS9P+kZRmuSYZaENzNGp8Uo5cnp0apJ0vMq4uaB2LSqazrFTkBvI1g pTk3+6ebIhJxteSWflnY0D+TuQI+ebA= Received: by mail-pl1-f178.google.com with SMTP id jl24so6245413plb.8 for ; Fri, 02 Dec 2022 18:38:03 -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=VAZAdRF8vrZTp/mHSVWy9MMB9u9NBs0ME34bPedChTywrBf/uoQUBvI5YOcbh2ztLj s+2o+eCnP8JXDltj3UKNg5aa2ZhDfXI1Qe3QaPnb1xwPh8cYRiqwEQ2ro3s45s6JX2F1 KLTVUvbrCYn4c5OlPpHWPrYxoMxDX3MeRMy1bNXpccbHQQe/IZFv8i1B+RxTkTaR1s3E odraWUgfjlvS2BCv/Sx/nBtm+G5w/qcycuvSmJ8BsdDJ9R0r3ezXPT5PcpXNQ7rYXotO oOo6ZggexcXtED65nod+GIRAoCdbycGweqvW1cFIL3+x9bOiRI1K0ns3f9sQ4lNZ9JR/ BGZg== X-Gm-Message-State: ANoB5pmmtEPBlv3ql+IANmHk7z7ue4HsVfN21aM5OHC/XdNr3d01BqGH uSAU7Mp1Uwfi83wZ8PqsEQfLwA== 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> X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 53C6E40008 X-Stat-Signature: m371c3qn4kqcawjr5wkaa6yoknpct9tq X-Spamd-Result: default: False [3.92 / 9.00]; SORBS_IRL_BL(3.00)[209.85.214.178:from]; SUSPICIOUS_RECIPS(1.50)[]; BAYES_HAM(-1.18)[81.62%]; MID_RHS_NOT_FQDN(0.50)[]; MIME_GOOD(-0.10)[text/plain]; BAD_REP_POLICIES(0.10)[]; RCVD_NO_TLS_LAST(0.10)[]; DKIM_TRACE(0.00)[chromium.org:+]; RCPT_COUNT_TWELVE(0.00)[39]; FROM_EQ_ENVFROM(0.00)[]; DMARC_POLICY_ALLOW(0.00)[chromium.org,none]; MIME_TRACE(0.00)[0:+]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; PREVIOUSLY_DELIVERED(0.00)[linux-mm@kvack.org]; R_DKIM_ALLOW(0.00)[chromium.org:s=google]; ARC_NA(0.00)[]; ARC_SIGNED(0.00)[hostedemail.com:s=arc-20220608:i=1]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(0.00)[+ip4:209.85.128.0/17]; TO_DN_SOME(0.00)[]; TAGGED_RCPT(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[] X-Rspam-User: X-HE-Tag: 1670035083-342828 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 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