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Fix bug in Checkmodule when downwriting to Module version 12 or lower. #273

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Fix bug in Checkmodule when downwriting to Module version 12 or lower. #273

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Commits on Nov 30, 2020

  1. Fix bug in policydb_write when attempting to correct policy for older… 

    … versions.

The current implementation fails as it doesn't remove scope declarations further in
the modular policy.

This fixes the problem by removing the offending entries in the hash table and
the scope table.

Steps to reproduce:

Try to build the following module then make a module from an older release:
module test 1.0.0;

require {
  type default_t;
}
attribute_role new_atrole;
checkmodule -M -m -c 12 -o test.mod test.te
semodule_package -o test.pp -m test.mod
semodule_package:  Error while reading policy module from test.mod

Failure occurs when the current module gets written out with the scope declaration intact.
This is due to policydb.c:3913 doing a hashtab search on a scope key that is not
in the symbol table.

Signed-off-by: Matthew Ife <[email protected]>
    Matthew Ife committed Nov 30, 2020
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  2. Smaller bugfixes and testing module works as imagined. 

    Signed-off-by: Matthew Ife <[email protected]>
    Matthew Ife committed Nov 30, 2020
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  3. Retab me. 

    Signed-off-by: Matthew Ife <[email protected]>
    @deleriux
    deleriux committed Nov 30, 2020
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