Commit 25e3fca4 authored Feb 04, 2018 by Jason A. Donenfeld Committed by Theodore Ts'o Feb 28, 2018

random: always fill buffer in get_random_bytes_wait



In the unfortunate event that a developer fails to check the return
value of get_random_bytes_wait, or simply wants to make a "best effort"
attempt, for whatever that's worth, it's much better to still fill the
buffer with _something_ rather than catastrophically failing in the case
of an interruption. This is both a defense in depth measure against
inevitable programming bugs, as well as a means of making the API a bit
more useful.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

parent 9f886f4d

include/linux/random.h

+1 −3

Original line number	Diff line number	Diff line
		@@ -85,10 +85,8 @@ static inline unsigned long get_random_canary(void)
		static inline int get_random_bytes_wait(void *buf, int nbytes)
		{
		int ret = wait_for_random_bytes();
		if (unlikely(ret))
		return ret;
		get_random_bytes(buf, nbytes);
		return 0;
		return ret;
		}

		#define declare_get_random_var_wait(var) \