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authorJason A. Donenfeld <Jason@zx2c4.com>2022-06-07 17:04:38 +0200
committerJason A. Donenfeld <Jason@zx2c4.com>2022-06-10 11:29:42 +0200
commit77fc95f8c0dc9e1f8e620ec14d2fb65028fb7adc (patch)
tree292233e8645cced0dd5de9ed1501298d1a8ec3d0 /drivers
parent39e0f991a62ed5efabd20711a7b6e7da92603170 (diff)
downloadlinux-77fc95f8c0dc9e1f8e620ec14d2fb65028fb7adc.tar.bz2
random: account for arch randomness in bits
Rather than accounting in bytes and multiplying (shifting), we can just account in bits and avoid the shift. The main motivation for this is there are other patches in flux that expand this code a bit, and avoiding the duplication of "* 8" everywhere makes things a bit clearer. Cc: stable@vger.kernel.org Fixes: 12e45a2a6308 ("random: credit architectural init the exact amount") Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/char/random.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/char/random.c b/drivers/char/random.c
index 0d6fb3eaf609..60d701a2516b 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -776,7 +776,7 @@ 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_bytes;
+ unsigned int i, arch_bits;
unsigned long entropy;
#if defined(LATENT_ENTROPY_PLUGIN)
@@ -784,12 +784,12 @@ int __init random_init(const char *command_line)
_mix_pool_bytes(compiletime_seed, sizeof(compiletime_seed));
#endif
- for (i = 0, arch_bytes = BLAKE2S_BLOCK_SIZE;
+ 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_bytes -= sizeof(entropy);
+ arch_bits -= sizeof(entropy) * 8;
}
_mix_pool_bytes(&entropy, sizeof(entropy));
}
@@ -801,8 +801,8 @@ int __init random_init(const char *command_line)
if (crng_ready())
crng_reseed();
else if (trust_cpu)
- _credit_init_bits(arch_bytes * 8);
- used_arch_random = arch_bytes * 8 >= POOL_READY_BITS;
+ _credit_init_bits(arch_bits);
+ used_arch_random = arch_bits >= POOL_READY_BITS;
WARN_ON(register_pm_notifier(&pm_notifier));