Re: [PATCH 01/11] crypto: rng - Add crypto_stdrng_get_bytes()

[Eric Biggers <ebiggers@kernel.org>]

On Wed, Mar 25, 2026 at 07:31:05PM -0700, Eric Biggers wrote:
> On Thu, Mar 26, 2026 at 02:38:47AM +0100, Jason A. Donenfeld wrote:
> > I'm a little worried about this because I don't want to see a
> > proliferation of crypto_stdrng_get_bytes() users. How can we be sure
> > that this is mostly never used?
> > 
> > 
> > Jason
> 
> Perhaps a slightly different comment?  By the end of the series it is:
> 
> /**
>  * crypto_stdrng_get_bytes() - get cryptographically secure random bytes
>  * @buf: output buffer holding the random numbers
>  * @len: length of the output buffer
>  *
>  * This function fills the caller-allocated buffer with random numbers using the
>  * normal Linux RNG if fips_enabled=0, or the highest-priority "stdrng"
>  * algorithm in the crypto_rng subsystem if fips_enabled=1.
>  *
>  * Context: May sleep
>  * Return: 0 function was successful; < 0 if an error occurred
>  */
> 
> We could add something like:
> 
>     Don't call this unless you are sure you need it.  In most cases you
>     should just call get_random_bytes_wait() directly.

Let me know if that addresses your concern, or if you're looking for
something else.

- Eric