diff options
Diffstat (limited to 'drivers/char/random.c')
| -rw-r--r-- | drivers/char/random.c | 50 |
1 files changed, 30 insertions, 20 deletions
diff --git a/drivers/char/random.c b/drivers/char/random.c index e591c6aadca4..1427f66252c6 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -772,18 +772,13 @@ static int random_pm_notification(struct notifier_block *nb, unsigned long actio static struct notifier_block pm_notifier = { .notifier_call = random_pm_notification }; /* - * The first collection of entropy occurs at system boot while interrupts - * are still turned off. Here we push in latent entropy, RDSEED, a timestamp, - * utsname(), and the command line. Depending on the above configuration knob, - * RDSEED may be considered sufficient for initialization. Note that much - * earlier setup may already have pushed entropy into the input pool by the - * time we get here. + * This is called extremely early, before time keeping functionality is + * available, but arch randomness is. Interrupts are not yet enabled. */ -int __init random_init(const char *command_line) +void __init random_init_early(const char *command_line) { - ktime_t now = ktime_get_real(); - size_t i, longs, arch_bits; unsigned long entropy[BLAKE2S_BLOCK_SIZE / sizeof(long)]; + size_t i, longs, arch_bits; #if defined(LATENT_ENTROPY_PLUGIN) static const u8 compiletime_seed[BLAKE2S_BLOCK_SIZE] __initconst __latent_entropy; @@ -803,34 +798,49 @@ int __init random_init(const char *command_line) i += longs; continue; } - entropy[0] = random_get_entropy(); - _mix_pool_bytes(entropy, sizeof(*entropy)); arch_bits -= sizeof(*entropy) * 8; ++i; } - _mix_pool_bytes(&now, sizeof(now)); - _mix_pool_bytes(utsname(), sizeof(*(utsname()))); + _mix_pool_bytes(command_line, strlen(command_line)); + + /* Reseed if already seeded by earlier phases. */ + if (crng_ready()) + crng_reseed(); + else if (trust_cpu) + _credit_init_bits(arch_bits); +} + +/* + * This is called a little bit after the prior function, and now there is + * access to timestamps counters. Interrupts are not yet enabled. + */ +void __init random_init(void) +{ + unsigned long entropy = random_get_entropy(); + ktime_t now = ktime_get_real(); + + _mix_pool_bytes(utsname(), sizeof(*(utsname()))); + _mix_pool_bytes(&now, sizeof(now)); + _mix_pool_bytes(&entropy, sizeof(entropy)); add_latent_entropy(); /* - * If we were initialized by the bootloader before jump labels are - * initialized, then we should enable the static branch here, where + * If we were initialized by the cpu or bootloader before jump labels + * are initialized, then we should enable the static branch here, where * it's guaranteed that jump labels have been initialized. */ if (!static_branch_likely(&crng_is_ready) && crng_init >= CRNG_READY) crng_set_ready(NULL); + /* Reseed if already seeded by earlier phases. */ if (crng_ready()) crng_reseed(); - else if (trust_cpu) - _credit_init_bits(arch_bits); WARN_ON(register_pm_notifier(&pm_notifier)); - WARN(!random_get_entropy(), "Missing cycle counter and fallback timer; RNG " - "entropy collection will consequently suffer."); - return 0; + WARN(!entropy, "Missing cycle counter and fallback timer; RNG " + "entropy collection will consequently suffer."); } /* |