On Thu, Mar 16, 2017 at 06:31:45AM +0100, Oleksij Rempel wrote:
> From: Steffen Trumtrar <s.trumtrar@xxxxxxxxxxxxxx>
>
> Instead of generating pseudo random numbers, get random bytes
> from an optional HW generator, if enabled and registered.
>
> Signed-off-by: Steffen Trumtrar <s.trumtrar@xxxxxxxxxxxxxx>
> Signed-off-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
> ---
> lib/random.c | 19 +++++++++++++++++++
> 1 file changed, 19 insertions(+)
>
> diff --git a/lib/random.c b/lib/random.c
> index 210fea994..42c0f83b7 100644
> --- a/lib/random.c
> +++ b/lib/random.c
> @@ -1,5 +1,6 @@
> #include <common.h>
> #include <stdlib.h>
> +#include <linux/hw_random.h>
>
> static unsigned int random_seed;
>
> @@ -22,6 +23,24 @@ void get_random_bytes(void *_buf, int len)
> {
> char *buf = _buf;
>
> + if (IS_ENABLED(CONFIG_HWRNG)) {
> + struct hwrng *rng;
> + int bytes;
> +
> + rng = hwrng_get_first();
> + if (!IS_ERR(rng)) {
> + while (len) {
> + bytes = hwrng_get_data(rng, _buf, len, 1);
> + if (!bytes)
> + goto sw_fallback;
hwrng_get_data() looks like it could return a negative error code.
Sascha
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