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-rw-r--r--mm/mmap.c11
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)