1 files changed, 8 insertions, 0 deletions

diff --git a/mm/mprotect.c b/mm/mprotect.c
index b426f01c5e9c..672a76fddd5e 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -125,6 +125,14 @@ mprotect_fixup(struct vm_area_struct *vma, struct vm_area_struct **pprev,
          * a MAP_NORESERVE private mapping to writable will now reserve.
          */
         if (newflags & VM_WRITE) {
+                if (oldflags & VM_RESERVED) {
+                        BUG_ON(oldflags & VM_WRITE);
+                        printk(KERN_WARNING "program %s is using MAP_PRIVATE, "
+                                "PROT_WRITE mprotect of VM_RESERVED memory, "
+                                "which is deprecated. Please report this to "
+                                "linux-kernel@vger.kernel.org\n",current->comm);
+                        return -EACCES;
+                }
                 if (!(oldflags & (VM_ACCOUNT|VM_WRITE|VM_SHARED|VM_HUGETLB))) {
                         charged = nrpages;
                         if (security_vm_enough_memory(charged))