From nobody Mon Feb 9 00:54:27 2026 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 CB52CC88CB5 for ; Tue, 13 Jun 2023 00:15:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238710AbjFMAPY (ORCPT ); Mon, 12 Jun 2023 20:15:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52288 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239064AbjFMAOF (ORCPT ); Mon, 12 Jun 2023 20:14:05 -0400 Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 747A01BE5; Mon, 12 Jun 2023 17:12:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1686615157; x=1718151157; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=0w0eM3eQB07Ass1qJGPwxV0mmwv4IZmjBMBIbi82ENo=; b=ReZ5iDxtnRq/j9yOwTVVm8jfsnwBm5XBzlh2zJrrkvlhQ4Sw4nW3aQ0x FZQtGGk3lOA9NIbXbS7iz6esqfttDuhVz05nhygtkjTnQDYBEsSYcVrla gO/7pVN5RpeiK1tH42ldhPb3FBiDpz8gBe8WonZbzFy1fBUC8jf+tIn9G 9nTbtQo4hC4p+VZjDST0dKlQ3OJKzQo7ZwDcCyLkJzrtZ+wxV3Frhn0v+ OKhtfCOhz0i32BNjTL1smFYtrCD/KE+yjLF8BifgWD5xZabAkZ1W7+LIS 9FOX/bOIDh90mmht5l41dCvjRxos7UlYE4QqUfiNQql7zYHZGYmmenc+K w==; X-IronPort-AV: E=McAfee;i="6600,9927,10739"; a="361557093" X-IronPort-AV: E=Sophos;i="6.00,238,1681196400"; d="scan'208";a="361557093" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Jun 2023 17:12:24 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10739"; a="835671045" X-IronPort-AV: E=Sophos;i="6.00,238,1681196400"; d="scan'208";a="835671045" Received: from almeisch-mobl1.amr.corp.intel.com (HELO rpedgeco-desk4.amr.corp.intel.com) ([10.209.42.242]) by orsmga004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Jun 2023 17:12:23 -0700 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, david@redhat.com, debug@rivosinc.com, szabolcs.nagy@arm.com, torvalds@linux-foundation.org, broonie@kernel.org Cc: rick.p.edgecombe@intel.com, Yu-cheng Yu , Pengfei Xu Subject: [PATCH v9 19/42] mm/mmap: Add shadow stack pages to memory accounting Date: Mon, 12 Jun 2023 17:10:45 -0700 Message-Id: <20230613001108.3040476-20-rick.p.edgecombe@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230613001108.3040476-1-rick.p.edgecombe@intel.com> References: <20230613001108.3040476-1-rick.p.edgecombe@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" 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. Co-developed-by: Yu-cheng Yu Signed-off-by: Yu-cheng Yu Signed-off-by: Rick Edgecombe Reviewed-by: Borislav Petkov (AMD) Reviewed-by: Kees Cook Acked-by: Mike Rapoport (IBM) Acked-by: David Hildenbrand Tested-by: Pengfei Xu Tested-by: John Allen Tested-by: Kees Cook --- mm/internal.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/internal.h b/mm/internal.h index 68410c6d97ac..dd2ded32d3d5 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -535,14 +535,14 @@ static inline bool is_exec_mapping(vm_flags_t flags) } =20 /* - * Stack area - automatically grows in one direction + * Stack area (including shadow stacks) * * VM_GROWSUP / VM_GROWSDOWN VMAs are always private anonymous: * do_mmap() forbids all other combinations. */ static inline bool is_stack_mapping(vm_flags_t flags) { - return (flags & VM_STACK) =3D=3D VM_STACK; + return ((flags & VM_STACK) =3D=3D VM_STACK) || (flags & VM_SHADOW_STACK); } =20 /* --=20 2.34.1