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 X-Spam-Level: X-Spam-Status: No, score=-12.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3FC62C43457 for ; Mon, 12 Oct 2020 15:42:18 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id D5B0220575 for ; Mon, 12 Oct 2020 15:42:17 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D5B0220575 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 6481E6B0071; Mon, 12 Oct 2020 11:42:17 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 5F62B900002; Mon, 12 Oct 2020 11:42:17 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4C0466B0073; Mon, 12 Oct 2020 11:42:17 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0210.hostedemail.com [216.40.44.210]) by kanga.kvack.org (Postfix) with ESMTP id 1DFCC6B0071 for ; Mon, 12 Oct 2020 11:42:17 -0400 (EDT) Received: from smtpin18.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id B2327181AE864 for ; Mon, 12 Oct 2020 15:42:16 +0000 (UTC) X-FDA: 77363689872.18.burn02_5c0256a271fb Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin18.hostedemail.com (Postfix) with ESMTP id CDA77101445E6 for ; Mon, 12 Oct 2020 15:39:57 +0000 (UTC) X-HE-Tag: burn02_5c0256a271fb X-Filterd-Recvd-Size: 4810 Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by imf42.hostedemail.com (Postfix) with ESMTP for ; Mon, 12 Oct 2020 15:39:56 +0000 (UTC) IronPort-SDR: jpsKoJYOyAgxlQjMb8uS+PEjHcYE+MmsRf9atWF9UnMM7fFok6QT538Imkn6Aef+dN08zJDtOg +NE7onwFzIxg== X-IronPort-AV: E=McAfee;i="6000,8403,9772"; a="152686157" X-IronPort-AV: E=Sophos;i="5.77,367,1596524400"; d="scan'208";a="152686157" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Oct 2020 08:39:55 -0700 IronPort-SDR: PkpaoOa6r468En+/9cCo9SkQHi6hPO2r0V8t0+PcCg4UOmuctWR3VrgF3ShmczPQkOSSrVKcZA re4fALKKDmKg== X-IronPort-AV: E=Sophos;i="5.77,367,1596524400"; d="scan'208";a="530010886" Received: from yyu32-desk.sc.intel.com ([143.183.136.146]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Oct 2020 08:39:54 -0700 From: Yu-cheng Yu 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 , "Ravi V. Shankar" , Vedvyas Shanbhogue , Dave Martin , Weijiang Yang , Pengfei Xu Cc: Yu-cheng Yu Subject: [PATCH v14 17/26] mm/mmap: Add shadow stack pages to memory accounting Date: Mon, 12 Oct 2020 08:38:41 -0700 Message-Id: <20201012153850.26996-18-yu-cheng.yu@intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20201012153850.26996-1-yu-cheng.yu@intel.com> References: <20201012153850.26996-1-yu-cheng.yu@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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: Account shadow stack pages to stack memory. Signed-off-by: Yu-cheng Yu --- arch/x86/mm/pgtable.c | 7 +++++++ include/linux/pgtable.h | 11 +++++++++++ mm/mmap.c | 5 +++++ 3 files changed, 23 insertions(+) diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c index a9666b64bc05..68e98f70298b 100644 --- a/arch/x86/mm/pgtable.c +++ b/arch/x86/mm/pgtable.c @@ -893,3 +893,10 @@ int pmd_free_pte_page(pmd_t *pmd, unsigned long addr= ) =20 #endif /* CONFIG_X86_64 */ #endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */ + +#ifdef CONFIG_ARCH_HAS_SHADOW_STACK +bool arch_shadow_stack_mapping(vm_flags_t vm_flags) +{ + return (vm_flags & VM_SHSTK); +} +#endif diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index 157f5e726896..6f2ca5fffd44 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -1380,6 +1380,17 @@ static inline pmd_t arch_maybe_pmd_mkwrite(pmd_t p= md, struct vm_area_struct *vma #endif /* CONFIG_ARCH_MAYBE_MKWRITE */ #endif /* CONFIG_MMU */ =20 +#ifdef CONFIG_MMU +#ifdef CONFIG_ARCH_HAS_SHADOW_STACK +bool arch_shadow_stack_mapping(vm_flags_t vm_flags); +#else +static inline bool arch_shadow_stack_mapping(vm_flags_t vm_flags) +{ + return false; +} +#endif /* CONFIG_ARCH_HAS_SHADOW_STACK */ +#endif /* CONFIG_MMU */ + /* * Architecture PAGE_KERNEL_* fallbacks * diff --git a/mm/mmap.c b/mm/mmap.c index 40248d84ad5f..574b3f273462 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1682,6 +1682,9 @@ static inline int accountable_mapping(struct file *= file, vm_flags_t vm_flags) if (file && is_file_hugepages(file)) return 0; =20 + if (arch_shadow_stack_mapping(vm_flags)) + return 1; + return (vm_flags & (VM_NORESERVE | VM_SHARED | VM_WRITE)) =3D=3D VM_WRI= TE; } =20 @@ -3352,6 +3355,8 @@ void vm_stat_account(struct mm_struct *mm, vm_flags= _t flags, long npages) mm->stack_vm +=3D npages; else if (is_data_mapping(flags)) mm->data_vm +=3D npages; + else if (arch_shadow_stack_mapping(flags)) + mm->stack_vm +=3D npages; } =20 static vm_fault_t special_mapping_fault(struct vm_fault *vmf); --=20 2.21.0