[RFC PATCH v4 23/27] mm/map: Add Shadow stack pages to memory accounting
From: Yu-cheng Yu <hidden>
Date: 2018-09-21 15:11:44
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. Also check if the system has enough memory before enabling CET. 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 5f2b2b184c60..de2d0faa1c61 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c@@ -1671,6 +1671,9 @@ 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; }
@@ -3261,6 +3264,8 @@ 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->data_vm += npages; } static vm_fault_t special_mapping_fault(struct vm_fault *vmf);
--
2.17.1