crypto: avoid infinite loops in prime generation #37212
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Just write a program that takes another program as input and returns whether or not that program with the given parameter contains an infinite loop. That sounds like a reasonable and easy task :D |
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Thank you @benjamingr!
Oh, absolutely, just give me a couple of hours to disprove Turing! :P |
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PR-URL: nodejs#37212 Reviewed-By: Benjamin Gruenbaum <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Rich Trott <[email protected]>
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PR-URL: #37212 Reviewed-By: Benjamin Gruenbaum <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Rich Trott <[email protected]>
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PR-URL: #37212 Reviewed-By: Benjamin Gruenbaum <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Rich Trott <[email protected]>
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It's difficult to find precise conditions that would prevent infinite loops here and that can be checked without a significant performance impact.
Passing parameters that cause an infinite loop within OpenSSL will permanently block the application thread when in sync mode, or permanently disable one thread in the libuv thread pool when in async mode. Especially the latter behavior is hard to debug, and throwing reasonable errors makes that much easier.
These conditions prevent cases that will, with high probability, result in infinite loops within OpenSSL. In cases where OpenSSL does not get stuck in an infinite loop, the parameters that match these conditions would not result in randomly generated primes.
This is a fast best-effort approach that doesn't require additional
BIGNUMallocations.These conditions do not prevent all infinite loops.