[PATCH] hot-add-mem x86_64: use CONFIG_MEMORY_HOTPLUG_RESERVE

[firefly-linux-kernel-4.4.55.git] / mm / madvise.c

diff --git a/mm/madvise.c b/mm/madvise.c
index af3d573b014122f7fd2a99c3ee90c3826f70457f..4e196155a0c3635801bd0f8dcff0b18ce1bbcf37 100644 (file)
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -168,6 +168,9 @@ static long madvise_remove(struct vm_area_struct *vma,
                        return -EINVAL;
        }
 
+       if ((vma->vm_flags & (VM_SHARED|VM_WRITE)) != (VM_SHARED|VM_WRITE))
+               return -EACCES;
+
        mapping = vma->vm_file->f_mapping;
 
        offset = (loff_t)(start - vma->vm_start)