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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 , Haitao Huang Cc: Yu-cheng Yu Subject: [PATCH v22 18/28] mm/mmap: Add shadow stack pages to memory accounting Date: Wed, 10 Mar 2021 14:00:36 -0800 Message-Id: <20210310220046.15866-19-yu-cheng.yu@intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20210310220046.15866-1-yu-cheng.yu@intel.com> References: <20210310220046.15866-1-yu-cheng.yu@intel.com> MIME-Version: 1.0 X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: D565DED X-Stat-Signature: kjsxt1yuthnzjt64c1qryqftj3wc5dyo Received-SPF: none (intel.com>: No applicable sender policy available) receiver=imf12; identity=mailfrom; envelope-from=""; helo=mga12.intel.com; client-ip=192.55.52.136 X-HE-DKIM-Result: none/none X-HE-Tag: 1615413678-531921 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 Reviewed-by: Kees Cook --- 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 0f4fbf51a9fc..948d28c29964 100644 --- a/arch/x86/mm/pgtable.c +++ b/arch/x86/mm/pgtable.c @@ -895,3 +895,10 @@ 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 fb85ab22b5e5..e96130e18977 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -1466,6 +1466,17 @@ 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 3f287599a7a3..2ac67882ace2 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1718,6 +1718,9 @@ 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 @@ -3387,6 +3390,8 @@ 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