diff options
Diffstat (limited to 'drivers/char/random.c')
| -rw-r--r-- | drivers/char/random.c | 33 |
1 files changed, 18 insertions, 15 deletions
diff --git a/drivers/char/random.c b/drivers/char/random.c index ddc493d976fd..4a8458ff5ee8 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -265,6 +265,7 @@ #include <linux/syscalls.h> #include <linux/completion.h> #include <linux/uuid.h> +#include <linux/locallock.h> #include <crypto/chacha20.h> #include <asm/processor.h> @@ -856,7 +857,7 @@ static int crng_fast_load(const char *cp, size_t len) invalidate_batched_entropy(); crng_init = 1; wake_up_interruptible(&crng_init_wait); - pr_notice("random: fast init done\n"); + /* pr_notice("random: fast init done\n"); */ } return 1; } @@ -941,17 +942,21 @@ static void crng_reseed(struct crng_state *crng, struct entropy_store *r) crng_init = 2; process_random_ready_list(); wake_up_interruptible(&crng_init_wait); - pr_notice("random: crng init done\n"); + /* pr_notice("random: crng init done\n"); */ if (unseeded_warning.missed) { +#if 0 pr_notice("random: %d get_random_xx warning(s) missed " "due to ratelimiting\n", unseeded_warning.missed); +#endif unseeded_warning.missed = 0; } if (urandom_warning.missed) { +#if 0 pr_notice("random: %d urandom warning(s) missed " "due to ratelimiting\n", urandom_warning.missed); +#endif urandom_warning.missed = 0; } } @@ -1122,8 +1127,6 @@ static void add_timer_randomness(struct timer_rand_state *state, unsigned num) } sample; long delta, delta2, delta3; - preempt_disable(); - sample.jiffies = jiffies; sample.cycles = random_get_entropy(); sample.num = num; @@ -1164,7 +1167,6 @@ static void add_timer_randomness(struct timer_rand_state *state, unsigned num) */ credit_entropy_bits(r, min_t(int, fls(delta>>1), 11)); } - preempt_enable(); } void add_input_randomness(unsigned int type, unsigned int code, @@ -1221,28 +1223,27 @@ static __u32 get_reg(struct fast_pool *f, struct pt_regs *regs) return *ptr; } -void add_interrupt_randomness(int irq, int irq_flags) +void add_interrupt_randomness(int irq, int irq_flags, __u64 ip) { struct entropy_store *r; struct fast_pool *fast_pool = this_cpu_ptr(&irq_randomness); - struct pt_regs *regs = get_irq_regs(); unsigned long now = jiffies; cycles_t cycles = random_get_entropy(); __u32 c_high, j_high; - __u64 ip; unsigned long seed; int credit = 0; if (cycles == 0) - cycles = get_reg(fast_pool, regs); + cycles = get_reg(fast_pool, NULL); c_high = (sizeof(cycles) > 4) ? cycles >> 32 : 0; j_high = (sizeof(now) > 4) ? now >> 32 : 0; fast_pool->pool[0] ^= cycles ^ j_high ^ irq; fast_pool->pool[1] ^= now ^ c_high; - ip = regs ? instruction_pointer(regs) : _RET_IP_; + if (!ip) + ip = _RET_IP_; fast_pool->pool[2] ^= ip; fast_pool->pool[3] ^= (sizeof(ip) > 4) ? ip >> 32 : - get_reg(fast_pool, regs); + get_reg(fast_pool, NULL); fast_mix(fast_pool); add_interrupt_bench(cycles); @@ -2192,6 +2193,7 @@ static rwlock_t batched_entropy_reset_lock = __RW_LOCK_UNLOCKED(batched_entropy_ * at any point prior. */ static DEFINE_PER_CPU(struct batched_entropy, batched_entropy_u64); +static DEFINE_LOCAL_IRQ_LOCK(batched_entropy_u64_lock); u64 get_random_u64(void) { u64 ret; @@ -2212,7 +2214,7 @@ u64 get_random_u64(void) warn_unseeded_randomness(&previous); use_lock = READ_ONCE(crng_init) < 2; - batch = &get_cpu_var(batched_entropy_u64); + batch = &get_locked_var(batched_entropy_u64_lock, batched_entropy_u64); if (use_lock) read_lock_irqsave(&batched_entropy_reset_lock, flags); if (batch->position % ARRAY_SIZE(batch->entropy_u64) == 0) { @@ -2222,12 +2224,13 @@ u64 get_random_u64(void) ret = batch->entropy_u64[batch->position++]; if (use_lock) read_unlock_irqrestore(&batched_entropy_reset_lock, flags); - put_cpu_var(batched_entropy_u64); + put_locked_var(batched_entropy_u64_lock, batched_entropy_u64); return ret; } EXPORT_SYMBOL(get_random_u64); static DEFINE_PER_CPU(struct batched_entropy, batched_entropy_u32); +static DEFINE_LOCAL_IRQ_LOCK(batched_entropy_u32_lock); u32 get_random_u32(void) { u32 ret; @@ -2242,7 +2245,7 @@ u32 get_random_u32(void) warn_unseeded_randomness(&previous); use_lock = READ_ONCE(crng_init) < 2; - batch = &get_cpu_var(batched_entropy_u32); + batch = &get_locked_var(batched_entropy_u32_lock, batched_entropy_u32); if (use_lock) read_lock_irqsave(&batched_entropy_reset_lock, flags); if (batch->position % ARRAY_SIZE(batch->entropy_u32) == 0) { @@ -2252,7 +2255,7 @@ u32 get_random_u32(void) ret = batch->entropy_u32[batch->position++]; if (use_lock) read_unlock_irqrestore(&batched_entropy_reset_lock, flags); - put_cpu_var(batched_entropy_u32); + put_locked_var(batched_entropy_u32_lock, batched_entropy_u32); return ret; } EXPORT_SYMBOL(get_random_u32); |