[RFC PATCH v9 26/27] mm/mmap: Add Shadow Stack pages to memory accounting
From: Yu-cheng Yu <hidden>
Date: 2020-02-05 18:20:51
Also in:
linux-arch, linux-doc, linux-mm, lkml
Subsystem:
memory management, memory mapping, the rest · Maintainers:
Andrew Morton, Liam R. Howlett, Lorenzo Stoakes, Linus Torvalds
Add Shadow Stack pages to memory accounting. v8: - Change Shadow Stake pages from data_vm to stack_vm. Signed-off-by: Yu-cheng Yu <redacted> --- mm/mmap.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/mm/mmap.c b/mm/mmap.c
index 71e4ffc83bcd..acfa04e2a5dd 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c@@ -1687,6 +1687,9 @@ static inline int accountable_mapping(struct file *file, vm_flags_t vm_flags) if (file && is_file_hugepages(file)) return 0; + if (arch_copy_pte_mapping(vm_flags)) + return 1; + return (vm_flags & (VM_NORESERVE | VM_SHARED | VM_WRITE)) == VM_WRITE; }
@@ -3302,6 +3305,8 @@ 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_copy_pte_mapping(flags)) + mm->stack_vm += npages; } static vm_fault_t special_mapping_fault(struct vm_fault *vmf);
--
2.21.0