From: Matthias Brugger <mbrug...@suse.com>
When calling srand_mac we use a weak seed dependent on the
mac address. If present, use a RNG device instead to incerase entropy.
Signed-off-by: Matthias Brugger <mbrug...@suse.com>
---
Changes in v2:
- fix dm_rng_read() parameters
- add missing include file
net/net_rand.h | 19 ++++++++++++++++++-
1 file changed, 18 insertions(+), 1 deletion(-)
diff --git a/net/net_rand.h b/net/net_rand.h
index 4bf9bd817e..e7299973a3 100644
--- a/net/net_rand.h
+++ b/net/net_rand.h
@@ -10,6 +10,8 @@
#define __NET_RAND_H__
#include <common.h>
+#include <dm/uclass.h>
+#include <rng.h>
/*
* Return a seed for the PRNG derived from the eth0 MAC address.
@@ -37,7 +39,22 @@ static inline unsigned int seed_mac(void)
*/
static inline void srand_mac(void)
{
- srand(seed_mac());
+#if defined(CONFIG_DM_RNG)
+ int ret;
+ struct udevice *devp;
+ u32 randv = 0;
+
+ ret = uclass_get_device(UCLASS_RNG, 0, &devp);
+ if (ret) {
+ ret = dm_rng_read(devp, &randv, sizeof(randv));
+ if (ret < 0)
+ randv = 0;
+ }
+ if (randv)
+ srand(randv);
+ else
+#endif
+ srand(seed_mac());
}
#endif /* __NET_RAND_H__ */
--
2.29.2
