Demand paged executables

[John F. Haugh II]

In article <7599 at chinet.chi.il.us> les at chinet.chi.il.us (Leslie Mikesell) writes:
>Now, if a.outs need this kind of protection (and they do) why isn't
>the same thing done for shell scripts - i.e prevent them from being
>modified while running?

Shell scripts should be protected from modification during execution, 
but you weren't dicussing preventing pure-text files from being opened
for writing.  There _is_ a need to prevent text prototypes from being
modified.  There is not a need to prevent a pure-text file from being
unlinked.  The kernel is capable of recovering the disk space when the
last reference [ loaded process ] goes away.  Disallowing write
permission on pure-text files should be all that is needed.  [ And
disallowing execution of pure-text files which are opened for writing ]
-- 
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