diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/char/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/char/hw_random/s390-trng.c | 9 | ||||
| -rw-r--r-- | drivers/char/random.c | 51 |
3 files changed, 34 insertions, 27 deletions
diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig index 0b6c03643ddc..30192e123e5f 100644 --- a/drivers/char/Kconfig +++ b/drivers/char/Kconfig @@ -431,7 +431,6 @@ config ADI config RANDOM_TRUST_CPU bool "Initialize RNG using CPU RNG instructions" default y - depends on ARCH_RANDOM help Initialize the RNG using random numbers supplied by the CPU's RNG instructions (e.g. RDRAND), if supported and available. These diff --git a/drivers/char/hw_random/s390-trng.c b/drivers/char/hw_random/s390-trng.c index 2beaa35c0d74..488808dc17a2 100644 --- a/drivers/char/hw_random/s390-trng.c +++ b/drivers/char/hw_random/s390-trng.c @@ -108,7 +108,6 @@ static ssize_t trng_counter_show(struct device *dev, { u64 dev_counter = atomic64_read(&trng_dev_counter); u64 hwrng_counter = atomic64_read(&trng_hwrng_counter); -#if IS_ENABLED(CONFIG_ARCH_RANDOM) u64 arch_counter = atomic64_read(&s390_arch_random_counter); return sysfs_emit(buf, @@ -118,14 +117,6 @@ static ssize_t trng_counter_show(struct device *dev, "total: %llu\n", dev_counter, hwrng_counter, arch_counter, dev_counter + hwrng_counter + arch_counter); -#else - return sysfs_emit(buf, - "trng: %llu\n" - "hwrng: %llu\n" - "total: %llu\n", - dev_counter, hwrng_counter, - dev_counter + hwrng_counter); -#endif } static DEVICE_ATTR(byte_counter, 0444, trng_counter_show, NULL); diff --git a/drivers/char/random.c b/drivers/char/random.c index a1af90bacc9f..d44832e9e709 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -229,7 +229,7 @@ static void crng_reseed(void) /* * This generates a ChaCha block using the provided key, and then - * immediately overwites that key with half the block. It returns + * immediately overwrites that key with half the block. It returns * the resultant ChaCha state to the user, along with the second * half of the block containing 32 bytes of random data that may * be used; random_data_len may not be greater than 32. @@ -596,12 +596,20 @@ static void extract_entropy(void *buf, size_t len) unsigned long rdseed[32 / sizeof(long)]; size_t counter; } block; - size_t i; + size_t i, longs; - for (i = 0; i < ARRAY_SIZE(block.rdseed); ++i) { - if (!arch_get_random_seed_long(&block.rdseed[i]) && - !arch_get_random_long(&block.rdseed[i])) - block.rdseed[i] = random_get_entropy(); + for (i = 0; i < ARRAY_SIZE(block.rdseed);) { + longs = arch_get_random_seed_longs(&block.rdseed[i], ARRAY_SIZE(block.rdseed) - i); + if (longs) { + i += longs; + continue; + } + longs = arch_get_random_longs(&block.rdseed[i], ARRAY_SIZE(block.rdseed) - i); + if (longs) { + i += longs; + continue; + } + block.rdseed[i++] = random_get_entropy(); } spin_lock_irqsave(&input_pool.lock, flags); @@ -643,10 +651,10 @@ static void __cold _credit_init_bits(size_t bits) add = min_t(size_t, bits, POOL_BITS); + orig = READ_ONCE(input_pool.init_bits); do { - orig = READ_ONCE(input_pool.init_bits); new = min_t(unsigned int, POOL_BITS, orig + add); - } while (cmpxchg(&input_pool.init_bits, orig, new) != orig); + } while (!try_cmpxchg(&input_pool.init_bits, &orig, new)); if (orig < POOL_READY_BITS && new >= POOL_READY_BITS) { crng_reseed(); /* Sets crng_init to CRNG_READY under base_crng.lock. */ @@ -776,22 +784,31 @@ static struct notifier_block pm_notifier = { .notifier_call = random_pm_notifica int __init random_init(const char *command_line) { ktime_t now = ktime_get_real(); - unsigned int i, arch_bits; - unsigned long entropy; + size_t i, longs, arch_bits; + unsigned long entropy[BLAKE2S_BLOCK_SIZE / sizeof(long)]; #if defined(LATENT_ENTROPY_PLUGIN) static const u8 compiletime_seed[BLAKE2S_BLOCK_SIZE] __initconst __latent_entropy; _mix_pool_bytes(compiletime_seed, sizeof(compiletime_seed)); #endif - for (i = 0, arch_bits = BLAKE2S_BLOCK_SIZE * 8; - i < BLAKE2S_BLOCK_SIZE; i += sizeof(entropy)) { - if (!arch_get_random_seed_long_early(&entropy) && - !arch_get_random_long_early(&entropy)) { - entropy = random_get_entropy(); - arch_bits -= sizeof(entropy) * 8; + for (i = 0, arch_bits = sizeof(entropy) * 8; i < ARRAY_SIZE(entropy);) { + longs = arch_get_random_seed_longs(entropy, ARRAY_SIZE(entropy) - i); + if (longs) { + _mix_pool_bytes(entropy, sizeof(*entropy) * longs); + i += longs; + continue; } - _mix_pool_bytes(&entropy, sizeof(entropy)); + longs = arch_get_random_longs(entropy, ARRAY_SIZE(entropy) - i); + if (longs) { + _mix_pool_bytes(entropy, sizeof(*entropy) * longs); + 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()))); |