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[2620:137:e000::1:20]) by mx.google.com with ESMTP id o2-20020a1709061b0200b00977e7f5da83si8660481ejg.686.2023.06.14.16.54.56; Wed, 14 Jun 2023 16:55:21 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=AiI6WTDA; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236475AbjFNXef (ORCPT + 99 others); Wed, 14 Jun 2023 19:34:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33516 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229516AbjFNXee (ORCPT ); Wed, 14 Jun 2023 19:34:34 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4B1901BD4; Wed, 14 Jun 2023 16:34:33 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id DCDB960DFC; Wed, 14 Jun 2023 23:34:32 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B75ABC433C0; Wed, 14 Jun 2023 23:34:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1686785672; bh=9vAVA0vgFk7ZYI1wt4Vl5FRDTi/wrA+OF5wp7ML/pow=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=AiI6WTDAzKwrOxtz6nWJfROnB1o1cyZzVocJOvEv8rNr3DjJoaRxjnyl6KI1/azc7 dnNjrbFqUc9BNT3gfLjxvYgGEoa/q8LZv/7/yKnnmFDxWDSmY81UsfknYZaSh0lC/p vTSl1mqWphg9hn6sB7tlbwNgjyoaf9+/fdlO0P8lH9PLRI1rvbRYSumKTyrNsiz887 zbFYdFN05Yy8WyzQ6HIUAMRSOGfEyPmVf1zlx4UM3La5NgbKBGrF30zc40THSrsbDC sSqEi0WaYlSbqhSMQPcV8yqqyxelVF2OWZp+dG+Qv50nvA8Qfi9Ju1mVwxbpCJLNWM 4H9tyl1pq2taw== Date: Thu, 15 Jun 2023 00:34:20 +0100 From: Mark Brown 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 , 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, david@redhat.com, debug@rivosinc.com, szabolcs.nagy@arm.com, torvalds@linux-foundation.org, Yu-cheng Yu , Pengfei Xu Subject: Re: [PATCH v9 16/42] mm: Add guard pages around a shadow stack. Message-ID: <6e2cd47f-f541-4a94-87f8-79204144fc8d@sirena.org.uk> References: <20230613001108.3040476-1-rick.p.edgecombe@intel.com> <20230613001108.3040476-17-rick.p.edgecombe@intel.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="vtj6G0y/iCDsSROv" Content-Disposition: inline In-Reply-To: <20230613001108.3040476-17-rick.p.edgecombe@intel.com> X-Cookie: You are false data. X-Spam-Status: No, score=-7.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_HI, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --vtj6G0y/iCDsSROv Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Mon, Jun 12, 2023 at 05:10:42PM -0700, Rick Edgecombe wrote: > 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. 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