1 files changed, 11 insertions, 0 deletions

diff --git a/mm/mmap.c b/mm/mmap.c
index 459b9f068ad7..8a111792b8db 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1088,6 +1088,17 @@ munmap_back:
                 error = file->f_op->mmap(file, vma);
                 if (error)
                         goto unmap_and_free_vma;
+                if ((vma->vm_flags & (VM_SHARED | VM_WRITE | VM_RESERVED))
+                                                == (VM_WRITE | VM_RESERVED)) {
+                        printk(KERN_WARNING "program %s is using MAP_PRIVATE, "
+                                "PROT_WRITE mmap of VM_RESERVED memory, which "
+                                "is deprecated. Please report this to "
+                                "linux-kernel@vger.kernel.org\n",current->comm);
+                        if (vma->vm_ops && vma->vm_ops->close)
+                                vma->vm_ops->close(vma);
+                        error = -EACCES;
+                        goto unmap_and_free_vma;
+                }
         } else if (vm_flags & VM_SHARED) {
                 error = shmem_zero_setup(vma);
                 if (error)