[rsbac] problem about MAC

[unimatter]

  Hi!

  I do exactly as "RSBAC for beginners" told me.
  I login as "test" and creat /tmp/mactest, then set
  /tmp/mactest's MAC security level to 2 and test's 
  security level to 2.
  
  The problem is:
  I can write /tmp/mactest, but I cannot read it.

  I add some printk to the kernel code, and I found that
  no matter what security level and category I set for user test,
  when run, test's security level is always 0, and category
  always 1.
 
  Why ?

  Thanks.

                                                   xh
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