unsigned long start, unsigned long end, struct list_head *uf,
bool unlock)
{
- struct mm_struct *mm = vma->vm_mm;
-
- /*
- * Check if memory is sealed, prevent unmapping a sealed VMA.
- * can_modify_mm assumes we have acquired the lock on MM.
- */
- if (unlikely(!can_modify_mm(mm, start, end)))
- return -EPERM;
-
- return do_vmi_align_munmap(vmi, vma, mm, start, end, uf, unlock);
+ return do_vmi_align_munmap(vmi, vma, vma->vm_mm, start, end, uf, unlock);
}
/*
if (end < vma->vm_end && mm->map_count >= sysctl_max_map_count)
goto map_count_exceeded;
+ /* Don't bother splitting the VMA if we can't unmap it anyway */
+ if (!can_modify_vma(vma)) {
+ error = -EPERM;
+ goto start_split_failed;
+ }
+
error = __split_vma(vmi, vma, start, 1);
if (error)
goto start_split_failed;
*/
next = vma;
do {
+ if (!can_modify_vma(next)) {
+ error = -EPERM;
+ goto modify_vma_failed;
+ }
+
/* Does it split the end? */
if (next->vm_end > end) {
error = __split_vma(vmi, next, end, 0);
__mt_destroy(&mt_detach);
return 0;
+modify_vma_failed:
clear_tree_failed:
userfaultfd_error:
munmap_gather_failed:
if (end == start)
return -EINVAL;
- /*
- * Check if memory is sealed, prevent unmapping a sealed VMA.
- * can_modify_mm assumes we have acquired the lock on MM.
- */
- if (unlikely(!can_modify_mm(mm, start, end)))
- return -EPERM;
-
/* Find the first overlapping VMA */
vma = vma_find(vmi, end);
if (!vma) {