[RFC PATCH v9 26/27] mm/mmap: Add Shadow Stack pages to memory accounting

Yu-cheng Yu
2020-02-05T18:20:51Z

Add Shadow Stack pages to memory accounting.

v8:
- Change Shadow Stake pages from data_vm to stack_vm.

Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
---
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