random: re-add removed comment about get_random_{u32,u64} reseeding (2ab449c6) · Commits · e / devices / android_kernel_fairphone_FP4

commit dd7aa36e535797926d8eb311da7151919130139d upstream. The comment about get_random_{u32,u64}() not invoking reseeding got added in an unrelated commit, that then was recently reverted by 0313bc278dac ("Revert "random: block in /dev/urandom""). So this adds that little comment snippet back, and improves the wording a bit too. Reviewed-by:

Dominik Brodowski <linux@dominikbrodowski.net> Signed-off-by:

Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by:

Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/char/random.c

+4 −3

Original line number	Diff line number	Diff line
		@@ -226,9 +226,10 @@ static void _warn_unseeded_randomness(const char func_name, void caller, void
		*
		* These interfaces will return the requested number of random bytes
		* into the given buffer or as a return value. This is equivalent to
		* a read from /dev/urandom. The integer family of functions may be
		* higher performance for one-off random integers, because they do a
		* bit of buffering.
		* a read from /dev/urandom. The u32, u64, int, and long family of
		* functions may be higher performance for one-off random integers,
		* because they do a bit of buffering and do not invoke reseeding
		* until the buffer is emptied.
		*
		*********************************************************************/