Patch Set 2: Sure, that's why getrandom has GRND_NONBLOCK flag and return value indicating actual number of random bits returned. The consensus (as I recall it) was to use osmo_rand() for "small" things like tmsi (with fallback to currently used insecure rand()). The "big" things are only necessary for crypto-related primitives which can use smth like gnutls directly. This got to be thoroughly documented of course.
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