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2.0.3x Kernel feature - immutable and append only files

Joerg Friedrich wrote:
  >And this is Alan Cox' note:
  >Linux 2.0.36 fixed various security holes as does any stable OS update.
  >       mmap on append only files has to be restricted to read maps. 

What utilities (if any) support append only and immutable files?  It doesn't
seem to be a feature of chmod and apropos produces nothing for immutable,
append or acl. There doesn't seem to be a chacl program anywhere.

Does the fileutils package need to be upgraded to support this feature?

Oliver Elphick                                Oliver.Elphick@lfix.co.uk
Isle of Wight                              http://www.lfix.co.uk/oliver
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     "For I say, through the grace given unto me, to every 
      man that is among you: Do not think of yourself more 
      highly than you ought, but rather think of yourself 
      with sober judgement, in accordance with the measure 
      of faith God has given you."            Romans 12:3 

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