forked from Minki/linux
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>
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@ -597,6 +597,10 @@ static int hfi1_file_mmap(struct file *fp, struct vm_area_struct *vma)
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vmf = 1;
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break;
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case STATUS:
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if (flags & (unsigned long)(VM_WRITE | VM_EXEC)) {
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ret = -EPERM;
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goto done;
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}
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memaddr = kvirt_to_phys((void *)dd->status);
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memlen = PAGE_SIZE;
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flags |= VM_IO | VM_DONTEXPAND;
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