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IB/hfi: Protect against writable mmap 

The device/port status is not intended to be changed from user space.
Prevent a user from mapping them as write or execute.

Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Ira Weiny 2017-04-09 10:17:24 -07:00 committed by Doug Ledford
parent ee495ada5c
commit 1222026764
1 changed files with 4 additions and 0 deletions
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4
drivers/infiniband/hw/hfi1/file_ops.c
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@ -597,6 +597,10 @@ static int hfi1_file_mmap(struct file *fp, struct vm_area_struct *vma)
vmf = 1;
break;
case STATUS:
if (flags & (unsigned long)(VM_WRITE | VM_EXEC)) {
ret = -EPERM;
goto done;
}
memaddr = kvirt_to_phys((void *)dd->status);
memlen = PAGE_SIZE;
flags |= VM_IO | VM_DONTEXPAND;