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 82007C43457 for ; Fri, 9 Oct 2020 18:34:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 559EB22284 for ; Fri, 9 Oct 2020 18:34:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390509AbgJISdf (ORCPT ); Fri, 9 Oct 2020 14:33:35 -0400 Received: from mga14.intel.com ([192.55.52.115]:9542 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390465AbgJISdX (ORCPT ); Fri, 9 Oct 2020 14:33:23 -0400 IronPort-SDR: D+gkfEKxTfATm3GpOWztNzWE2IBBQfOMfBICakmGyxkO7Y98+a3zp6n/sYt3OG9z/M3NqYENLP /Vaw5uAOSwWg== X-IronPort-AV: E=McAfee;i="6000,8403,9769"; a="164736623" X-IronPort-AV: E=Sophos;i="5.77,355,1596524400"; d="scan'208";a="164736623" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Oct 2020 11:33:22 -0700 IronPort-SDR: IEc5Yt270Rmj0Oi9i8rRmRUKNEuBztenkEftbr997kju6CQAkepjSwECp5P+SOQjI3q5i9nx5b Czf+uPq50ZsA== X-IronPort-AV: E=Sophos;i="5.77,355,1596524400"; d="scan'208";a="529031186" 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; 09 Oct 2020 11:33:22 -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: Fri, 9 Oct 2020 11:32:21 -0700 Message-Id: <20201009183230.26717-18-yu-cheng.yu@intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20201009183230.26717-1-yu-cheng.yu@intel.com> References: <20201009183230.26717-1-yu-cheng.yu@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Account shadow stack pages to stack memory. Signed-off-by: Yu-cheng Yu v10: - Use arch_shadow_stack_mapping() to make meaning clear. v8: - Change shadow stake pages from data_vm to stack_vm. --- 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) #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 pmd, struct vm_area_struct *vma #endif /* CONFIG_ARCH_MAYBE_MKWRITE */ #endif /* CONFIG_MMU */ +#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; + if (arch_shadow_stack_mapping(vm_flags)) + return 1; + return (vm_flags & (VM_NORESERVE | VM_SHARED | VM_WRITE)) == VM_WRITE; } @@ -3352,6 +3355,8 @@ void vm_stat_account(struct mm_struct *mm, vm_flags_t flags, long npages) mm->stack_vm += npages; else if (is_data_mapping(flags)) mm->data_vm += npages; + else if (arch_shadow_stack_mapping(flags)) + mm->stack_vm += npages; } static vm_fault_t special_mapping_fault(struct vm_fault *vmf); -- 2.21.0