To sum up the best advice I've seen.

  1. Suggest to add no re 'eval'; to ensure it's off
  2. Use a sub-process(fork) with to BSD::Resource(even on Linux) to ulimit memory and kill the child after some timeout
Perhaps #2 is overkill, there may be a simpler method, like additional flags to #1. Suggest to add a maxiterations to limit the number of times re is allowed to loop and maxmem.

References:

  1. Re^4: Untaint a string match, regular expression.
  2. Re^7: Untaint a string match, regular expression.

In reply to Re: Untaint a string match, regular expression. by cheako
in thread Untaint a string match, regular expression. by cheako

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