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| author | Matthias Brugger <mbrugger@suse.com> | 2020-12-18 10:28:04 +0100 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2021-01-19 09:15:02 -0500 |
| commit | ea707dc0aaafad34bba436b206af340c410dfb1b (patch) | |
| tree | 9260ffa43ebee1bc9ddae35aa15b9b46728532f0 /net | |
| parent | 92fdad28cfdf078fe34c198ef430933e7b2825a1 (diff) | |
| download | u-boot-ea707dc0aaafad34bba436b206af340c410dfb1b.tar.gz u-boot-ea707dc0aaafad34bba436b206af340c410dfb1b.tar.bz2 u-boot-ea707dc0aaafad34bba436b206af340c410dfb1b.zip | |
net: Use NDRNG device in srand_mac()
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 <mbrugger@suse.com>
Reviewed-by: Torsten Duwe <duwe@suse.de>
Diffstat (limited to 'net')
| -rw-r--r-- | net/net_rand.h | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/net/net_rand.h b/net/net_rand.h index 4bf9bd817e..6a52cda85e 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()); + int ret; + struct udevice *devp; + u32 randv = 0; + + if (IS_ENABLED(CONFIG_DM_RNG)) { + 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 + srand(seed_mac()); } #endif /* __NET_RAND_H__ */ |