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[2620:137:e000::1:20]) by mx.google.com with ESMTP id u24-20020aa7db98000000b0046356ff4d4esi558806edt.593.2022.12.02.16.40.07; Fri, 02 Dec 2022 16:40:29 -0800 (PST) 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=@intel.com header.s=Intel header.b=FrVlq4W0; 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=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234960AbiLCAjD (ORCPT + 99 others); Fri, 2 Dec 2022 19:39:03 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43224 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235079AbiLCAiQ (ORCPT ); Fri, 2 Dec 2022 19:38:16 -0500 Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EF118F7A20; Fri, 2 Dec 2022 16:37:08 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1670027828; x=1701563828; h=from:to:cc:subject:date:message-id:in-reply-to: references; bh=1FbLmykB0ip+0YSpvmtMRXYiZF0PQna5zAJx/OBtUAc=; b=FrVlq4W0/Bnk91a/svdqlZ5VSP3D2jXi+ztKT82zIp1bWAdVLMhuoNHC KJSp+FmTSmFHCtUrxVifeyVl7Zuy1rJNjQJDQzbfCHOiYwShXEPPcCdPB 7s7YZOy+M1ADim8qNo4oJA6zCdxZp+os9Gj6/9NmYfBeSz5/GBM8RjipH /pAMTgKIMHcgd6qB+t0c9PSvu2nGqmzMKUOTgJyboWwrWEOCBkpI9h5AA t/0vtMFyARpon0mKVOAJpQ3KxBhL5jjRVRk5b6GFZQ4jLiYy2OWlK/5qp Es5PnOOza6X/tYcLsezsZbZYYUOGM3smTLzissS+r/5iE+cDntqO/XWGj Q==; X-IronPort-AV: E=McAfee;i="6500,9779,10549"; a="313710991" X-IronPort-AV: E=Sophos;i="5.96,213,1665471600"; d="scan'208";a="313710991" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Dec 2022 16:37:04 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10549"; a="787479865" X-IronPort-AV: E=Sophos;i="5.96,213,1665471600"; d="scan'208";a="787479865" Received: from bgordon1-mobl1.amr.corp.intel.com (HELO rpedgeco-desk.amr.corp.intel.com) ([10.212.211.211]) by fmsmga001-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Dec 2022 16:37:02 -0800 From: Rick Edgecombe To: 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 Cc: rick.p.edgecombe@intel.com, Yu-cheng Yu , Peter Xu Subject: [PATCH v4 14/39] mm: Move VM_UFFD_MINOR_BIT from 37 to 38 Date: Fri, 2 Dec 2022 16:35:41 -0800 Message-Id: <20221203003606.6838-15-rick.p.edgecombe@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20221203003606.6838-1-rick.p.edgecombe@intel.com> References: <20221203003606.6838-1-rick.p.edgecombe@intel.com> 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_NONE 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 X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1751151311408260296?= X-GMAIL-MSGID: =?utf-8?q?1751151311408260296?= 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. Future patches will introduce a new VM flag VM_SHADOW_STACK that will be VM_HIGH_ARCH_BIT_5. VM_HIGH_ARCH_BIT_1 through VM_HIGH_ARCH_BIT_4 are bits 32-36, and bit 37 is the unrelated VM_UFFD_MINOR_BIT. For the sake of order, make all VM_HIGH_ARCH_BITs stay together by moving VM_UFFD_MINOR_BIT from 37 to 38. This will allow VM_SHADOW_STACK to be introduced as 37. Tested-by: Pengfei Xu Tested-by: John Allen Reviewed-by: Kees Cook Acked-by: Peter Xu Signed-off-by: Yu-cheng Yu Reviewed-by: Axel Rasmussen Signed-off-by: Rick Edgecombe Cc: Peter Xu Cc: Mike Kravetz --- include/linux/mm.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index bfac5a166cb8..9ae6bc38d0b7 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -354,7 +354,7 @@ extern unsigned int kobjsize(const void *objp); #endif #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_MINOR -# define VM_UFFD_MINOR_BIT 37 +# define VM_UFFD_MINOR_BIT 38 # define VM_UFFD_MINOR BIT(VM_UFFD_MINOR_BIT) /* UFFD minor faults */ #else /* !CONFIG_HAVE_ARCH_USERFAULTFD_MINOR */ # define VM_UFFD_MINOR VM_NONE