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uts: Allow for address space randomisation.
Randomise the base addresses of shared objects, non-fixed mappings, the
stack and the heap.  Introduce a service, svc:/system/process-security,
and a tool psecflags(1) to control and observe it

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          --- old/usr/src/uts/sparc/os/name_to_sysnum
          +++ new/usr/src/uts/sparc/os/name_to_sysnum
   1    1  nosys                   0
   2    2  rexit                   1
        3 +psecflags               2
   3    4  read                    3
   4    5  write                   4
   5    6  open                    5
   6    7  close                   6
   7    8  linkat                  7
   8    9  link                    9
   9   10  unlink                  10
  10   11  symlinkat               11
  11   12  chdir                   12
  12   13  gtime                   13
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