[GoblinSlayer]

If CSPRNGs are impossible, then you will have no CSPRNGs so both /dev/random and /dev/urandom will be insecure and will provide no guarantees solely due to impossibility of CSPRNGs.

[throway_zwudbo]

/dev/random does not have to depend on any pseudo generator as long as it can block indefinitely while starved for entropy.