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Date:   Thu, 22 Jul 2021 13:52:06 -0700
From:   Yu-cheng Yu <yu-cheng.yu@...el.com>
To:     x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-mm@...ck.org,
        linux-arch@...r.kernel.org, linux-api@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>,
        Andy Lutomirski <luto@...nel.org>,
        Balbir Singh <bsingharora@...il.com>,
        Borislav Petkov <bp@...en8.de>,
        Cyrill Gorcunov <gorcunov@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Eugene Syromiatnikov <esyr@...hat.com>,
        Florian Weimer <fweimer@...hat.com>,
        "H.J. Lu" <hjl.tools@...il.com>, Jann Horn <jannh@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Kees Cook <keescook@...omium.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Oleg Nesterov <oleg@...hat.com>, Pavel Machek <pavel@....cz>,
        Peter Zijlstra <peterz@...radead.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Vedvyas Shanbhogue <vedvyas.shanbhogue@...el.com>,
        Dave Martin <Dave.Martin@....com>,
        Weijiang Yang <weijiang.yang@...el.com>,
        Pengfei Xu <pengfei.xu@...el.com>,
        Haitao Huang <haitao.huang@...el.com>,
        Rick P Edgecombe <rick.p.edgecombe@...el.com>
Cc:     Yu-cheng Yu <yu-cheng.yu@...el.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH v28 19/32] mm/mmap: Add shadow stack pages to memory accounting

Account shadow stack pages to stack memory.

Signed-off-by: Yu-cheng Yu <yu-cheng.yu@...el.com>
Reviewed-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Cc: Kees Cook <keescook@...omium.org>
---
v26:
- Remove redundant #ifdef CONFIG_MMU.

v25:
- Remove #ifdef CONFIG_ARCH_HAS_SHADOW_STACK for is_shadow_stack_mapping().

v24:
- Change arch_shadow_stack_mapping() to is_shadow_stack_mapping().
- Change VM_SHSTK to VM_SHADOW_STACK.

 arch/x86/include/asm/pgtable.h | 3 +++
 arch/x86/mm/pgtable.c          | 5 +++++
 include/linux/pgtable.h        | 7 +++++++
 mm/mmap.c                      | 5 +++++
 4 files changed, 20 insertions(+)

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index bfe4ea2b652d..0983a91b464c 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -1638,6 +1638,9 @@ static inline bool arch_faults_on_old_pte(void)
 #define maybe_mkwrite maybe_mkwrite
 extern pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma);
 
+#define is_shadow_stack_mapping is_shadow_stack_mapping
+extern bool is_shadow_stack_mapping(vm_flags_t vm_flags);
+
 #endif	/* __ASSEMBLY__ */
 
 #endif /* _ASM_X86_PGTABLE_H */
diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index ba449d12ec32..945f6b5a42e5 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -888,3 +888,8 @@ int pmd_free_pte_page(pmd_t *pmd, unsigned long addr)
 
 #endif /* CONFIG_X86_64 */
 #endif	/* CONFIG_HAVE_ARCH_HUGE_VMAP */
+
+bool is_shadow_stack_mapping(vm_flags_t vm_flags)
+{
+	return vm_flags & VM_SHADOW_STACK;
+}
diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index d147480cdefc..eca0a7b80b3e 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -1508,6 +1508,13 @@ static inline bool arch_has_pfn_modify_check(void)
 }
 #endif /* !_HAVE_ARCH_PFN_MODIFY_ALLOWED */
 
+#ifndef is_shadow_stack_mapping
+static inline bool is_shadow_stack_mapping(vm_flags_t vm_flags)
+{
+	return false;
+}
+#endif
+
 /*
  * Architecture PAGE_KERNEL_* fallbacks
  *
diff --git a/mm/mmap.c b/mm/mmap.c
index ca54d36d203a..6be9ff4007ab 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1721,6 +1721,9 @@ static inline int accountable_mapping(struct file *file, vm_flags_t vm_flags)
 	if (file && is_file_hugepages(file))
 		return 0;
 
+	if (is_shadow_stack_mapping(vm_flags))
+		return 1;
+
 	return (vm_flags & (VM_NORESERVE | VM_SHARED | VM_WRITE)) == VM_WRITE;
 }
 
@@ -3370,6 +3373,8 @@ 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 (is_shadow_stack_mapping(flags))
+		mm->stack_vm += npages;
 }
 
 static vm_fault_t special_mapping_fault(struct vm_fault *vmf);
-- 
2.21.0

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