title: For arm Linux, could threads in user space access virtual address of Kernel space?
body: <p>Virtual memory is split two parts. In tradition, 0~3GB is for user space and 3GB~4GB for kernel space.</p>
  
  <p>My question:</p>
  
  <p>Could the thread in user space access memory of kernel space?</p>
  
  <p>For ARM datasheet, the access attribution is in the charge of domain access control register. But in kernel source code,the domain value in page table entry of user space virtual memory is same as kernel space's page table entry.</p>