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 1BDABC678D5 for ; Tue, 7 Mar 2023 10:44:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230202AbjCGKoW (ORCPT ); Tue, 7 Mar 2023 05:44:22 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56584 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230323AbjCGKns (ORCPT ); Tue, 7 Mar 2023 05:43:48 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0B0E559E9 for ; Tue, 7 Mar 2023 02:42:58 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1678185777; h=from:from: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:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=hkSFfGl4soWJh275ABriCY4OJqXhUGnQB2a/+uhCoY0=; b=NP+mJuQBTRXpmiZamhE9E6AOG+TjadKw/S5x8ma7TSZ0AW0qvjyJw5h+OSLLXL5rHVKcP8 7vKwEMkXu1Tmhonl9mrT0DZO3PZnR/BMeMtHVSIP+mphAz403iXxFIfKTIAeoQhB8Tz2R7 /vpnhZMscUSeQAOIiTfl6bjThwC5bPg= Received: from mail-wr1-f72.google.com (mail-wr1-f72.google.com [209.85.221.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-628-JGBRQ54WP8qbeLFnlyzYmQ-1; Tue, 07 Mar 2023 05:42:56 -0500 X-MC-Unique: JGBRQ54WP8qbeLFnlyzYmQ-1 Received: by mail-wr1-f72.google.com with SMTP id ba28-20020a0560001c1c00b002cc6d1f0c06so2099097wrb.17 for ; Tue, 07 Mar 2023 02:42:56 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1678185775; h=content-transfer-encoding:in-reply-to:organization:from:references :cc:to:content-language:subject:user-agent:mime-version:date :message-id:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=hkSFfGl4soWJh275ABriCY4OJqXhUGnQB2a/+uhCoY0=; b=56aTquD9+5vy8RYFgyJU/eoZPIb2Zq2/5mYTBkSkWo4XqgWpEGr6wCmBEFzUYLBtA2 EK1QVIWnhHX4luQ3L7mlBenwqU5bOyOiZCLmrrCxK6m3SxIf0DDlLiUoeYeR3UB3jMK4 6f5eP+2sYPV5VXrAC4BJwQAKIjpI5HN/UKj3qKd3jX5kc2jUjJv82e5Mk6GtnsSztsd6 oh09piSRV2yKwH9efQ3WFvtx82XKF0iBnPeloy02e5kz9mAcVGAb5e2XzIs7vuQE585/ SxrD/mS0yCBnj2oSFlF++lTun5j9cycLVJfKOtx/LKm5YuK7LolzesKz1D9MQ+8t1ZqB Kp+g== X-Gm-Message-State: AO0yUKXsp/eR7+V9+bIBbyFeMX1P/tVJQSOow+lFxobJab9Yi+o6nMIP NCmzPOz5esPk3B2DuXeiYkuXw8fZedLDP9TZ4u/7X+0LqqblTkduS0iC+abtYpwWnkS62e8YpbB YM1X70J8wooRr58Dro/fRCE07 X-Received: by 2002:a05:600c:4687:b0:3e2:201a:5bcc with SMTP id p7-20020a05600c468700b003e2201a5bccmr12423828wmo.33.1678185775723; Tue, 07 Mar 2023 02:42:55 -0800 (PST) X-Google-Smtp-Source: AK7set9qXIxQ9yHJKIfCwELq7tomci3ICaGJvPRazUwNeud11Cy9qjJe48+RLn1VklykElHsR9Tgqw== X-Received: by 2002:a05:600c:4687:b0:3e2:201a:5bcc with SMTP id p7-20020a05600c468700b003e2201a5bccmr12423799wmo.33.1678185775374; Tue, 07 Mar 2023 02:42:55 -0800 (PST) Received: from ?IPV6:2003:cb:c707:a100:e20:41da:c49b:8974? (p200300cbc707a1000e2041dac49b8974.dip0.t-ipconnect.de. [2003:cb:c707:a100:e20:41da:c49b:8974]) by smtp.gmail.com with ESMTPSA id h8-20020a5d5048000000b002c592535839sm12176234wrt.17.2023.03.07.02.42.53 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 07 Mar 2023 02:42:54 -0800 (PST) Message-ID: <1467f1b3-a529-50d3-9539-1056b2912d48@redhat.com> Date: Tue, 7 Mar 2023 11:42:53 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.8.0 Subject: Re: [PATCH v7 22/41] mm/mmap: Add shadow stack pages to memory accounting Content-Language: en-US To: Rick Edgecombe , 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 , Kees Cook , 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, debug@rivosinc.com Cc: Yu-cheng Yu References: <20230227222957.24501-1-rick.p.edgecombe@intel.com> <20230227222957.24501-23-rick.p.edgecombe@intel.com> From: David Hildenbrand Organization: Red Hat In-Reply-To: <20230227222957.24501-23-rick.p.edgecombe@intel.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 27.02.23 23:29, 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. Do this by adding a > VM_SHADOW_STACK check in is_stack_mapping(). > > Tested-by: Pengfei Xu > Tested-by: John Allen > Tested-by: Kees Cook > Acked-by: Mike Rapoport (IBM) > Reviewed-by: Kees Cook > Signed-off-by: Yu-cheng Yu > Co-developed-by: Rick Edgecombe > Signed-off-by: Rick Edgecombe > Cc: Kees Cook > > --- > v7: > - Change is_stack_mapping() to know about VM_SHADOW_STACK so the > additions in vm_stat_account() can be dropped. (David Hildenbrand) > > v3: > - Remove unneeded VM_SHADOW_STACK check in accountable_mapping() > (Kirill) > > v2: > - Remove is_shadow_stack_mapping() and just change it to directly bitwise > and VM_SHADOW_STACK. > > Yu-cheng v26: > - Remove redundant #ifdef CONFIG_MMU. > > Yu-cheng v25: > - Remove #ifdef CONFIG_ARCH_HAS_SHADOW_STACK for is_shadow_stack_mapping(). > --- > mm/internal.h | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/mm/internal.h b/mm/internal.h > index 7920a8b7982e..1d13d5580f64 100644 > --- a/mm/internal.h > +++ b/mm/internal.h > @@ -491,14 +491,14 @@ static inline bool is_exec_mapping(vm_flags_t flags) > } > > /* > - * Stack area - automatically grows in one direction > + * Stack area Maybe "Stack area (including shadow stacks)" Acked-by: David Hildenbrand -- Thanks, David / dhildenb