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Comment by angry_octet

8 hours ago

All the uses of vmsplice etc are a bit tricky, and that points to the need for a better interface. But given you're using splice, why not do the crypto in user space? A belief that it is better to be fast and buggy than safe and slower?

3 comments

angry_octet

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eqvinox  7 hours ago

If neither a hardware component nor kernel key management is involved, crypto should be done in userspace, end of sentence.

The more I think about it, the more I think it should be behind CAP_SYS_ADMIN, or a new CAP_KCRYPT (better name TBD. CAP_CRYPT_OFFLOAD?)

  • angry_octet  5 hours ago

    Yes it should definitely require a capability.

    Still a risk that some admin-enabled method (like enabling an IPsec VPN) provides a path to it, but would reduce the potential for crafting weird inputs.