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Diffstat (limited to 'arch/x86/mm/mpx.c')
-rw-r--r--arch/x86/mm/mpx.c51
1 files changed, 7 insertions, 44 deletions
diff --git a/arch/x86/mm/mpx.c b/arch/x86/mm/mpx.c
index db1b0bc5017c..134948b0926f 100644
--- a/arch/x86/mm/mpx.c
+++ b/arch/x86/mm/mpx.c
@@ -42,58 +42,21 @@ static inline unsigned long mpx_bt_size_bytes(struct mm_struct *mm)
*/
static unsigned long mpx_mmap(unsigned long len)
{
- unsigned long ret;
- unsigned long addr, pgoff;
struct mm_struct *mm = current->mm;
- vm_flags_t vm_flags;
- struct vm_area_struct *vma;
+ unsigned long addr, populate;
/* Only bounds table can be allocated here */
if (len != mpx_bt_size_bytes(mm))
return -EINVAL;
down_write(&mm->mmap_sem);
-
- /* Too many mappings? */
- if (mm->map_count > sysctl_max_map_count) {
- ret = -ENOMEM;
- goto out;
- }
-
- /* Obtain the address to map to. we verify (or select) it and ensure
- * that it represents a valid section of the address space.
- */
- addr = get_unmapped_area(NULL, 0, len, 0, MAP_ANONYMOUS | MAP_PRIVATE);
- if (addr & ~PAGE_MASK) {
- ret = addr;
- goto out;
- }
-
- vm_flags = VM_READ | VM_WRITE | VM_MPX |
- mm->def_flags | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC;
-
- /* Set pgoff according to addr for anon_vma */
- pgoff = addr >> PAGE_SHIFT;
-
- ret = mmap_region(NULL, addr, len, vm_flags, pgoff);
- if (IS_ERR_VALUE(ret))
- goto out;
-
- vma = find_vma(mm, ret);
- if (!vma) {
- ret = -ENOMEM;
- goto out;
- }
-
- if (vm_flags & VM_LOCKED) {
- up_write(&mm->mmap_sem);
- mm_populate(ret, len);
- return ret;
- }
-
-out:
+ addr = do_mmap(NULL, 0, len, PROT_READ | PROT_WRITE,
+ MAP_ANONYMOUS | MAP_PRIVATE, VM_MPX, 0, &populate);
up_write(&mm->mmap_sem);
- return ret;
+ if (populate)
+ mm_populate(addr, populate);
+
+ return addr;
}
enum reg_type {