diff options
Diffstat (limited to 'mm/mmap.c')
| -rw-r--r-- | mm/mmap.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index b6be3249f0a9..971dd2cb77d2 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -612,6 +612,8 @@ static unsigned long count_vma_pages_range(struct mm_struct *mm, void __vma_link_rb(struct mm_struct *mm, struct vm_area_struct *vma, struct rb_node **rb_link, struct rb_node *rb_parent) { + WARN_ONCE(vma->vm_file && !vma->vm_ops, "missing vma->vm_ops"); + /* Update tracking information for the gap following the new vma. */ if (vma->vm_next) vma_gap_update(vma->vm_next); @@ -1260,14 +1262,12 @@ static inline int mlock_future_check(struct mm_struct *mm, /* * The caller must hold down_write(¤t->mm->mmap_sem). */ - -unsigned long do_mmap_pgoff(struct file *file, unsigned long addr, +unsigned long do_mmap(struct file *file, unsigned long addr, unsigned long len, unsigned long prot, - unsigned long flags, unsigned long pgoff, - unsigned long *populate) + unsigned long flags, vm_flags_t vm_flags, + unsigned long pgoff, unsigned long *populate) { struct mm_struct *mm = current->mm; - vm_flags_t vm_flags; *populate = 0; @@ -1311,7 +1311,7 @@ unsigned long do_mmap_pgoff(struct file *file, unsigned long addr, * to. we assume access permissions have been handled by the open * of the memory object, so we don't do any here. */ - vm_flags = calc_vm_prot_bits(prot) | calc_vm_flag_bits(flags) | + vm_flags |= calc_vm_prot_bits(prot) | calc_vm_flag_bits(flags) | mm->def_flags | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC; if (flags & MAP_LOCKED) @@ -1638,6 +1638,12 @@ unsigned long mmap_region(struct file *file, unsigned long addr, */ WARN_ON_ONCE(addr != vma->vm_start); + /* All file mapping must have ->vm_ops set */ + if (!vma->vm_ops) { + static const struct vm_operations_struct dummy_ops = {}; + vma->vm_ops = &dummy_ops; + } + addr = vma->vm_start; vm_flags = vma->vm_flags; } else if (vm_flags & VM_SHARED) { |