"deplete the entropy pool" isn't really a meaningful phrase given the way the Linux /dev/{random,urandom} work. AFAIK /dev/random and /dev/urandom use the same

"deplete the entropy pool" isn't really a meaningful phrase given the way the Linux /dev/{random,urandom} work. AFAIK /dev/random and /dev/urandom use the same CSPRNG (different instances) which is periodically reseeded with entropy gathered from the system (hw, interrupt timings, etc.), the only difference being that the /dev/random device blocks if an entropy estimator says that there's "too little entropy". It's not that /dev/random has been "depleted" (which is meaningless given how a CSPRNG works), it's just that some entropy estimation code thinks that it might not be a source of perfect entropy/randomness at a particular time. (This practice is pretty questionable, hence the proposed new syscall.)