diff options
Diffstat (limited to 'drivers/char/random.c')
| -rw-r--r-- | drivers/char/random.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/char/random.c b/drivers/char/random.c index 6035ab8d5ef..54ca8b23cde 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -387,7 +387,7 @@ static DECLARE_WAIT_QUEUE_HEAD(random_write_wait); static struct fasync_struct *fasync; #if 0 -static int debug; +static bool debug; module_param(debug, bool, 0644); #define DEBUG_ENT(fmt, arg...) do { \ if (debug) \ @@ -624,8 +624,8 @@ static struct timer_rand_state input_timer_state; static void add_timer_randomness(struct timer_rand_state *state, unsigned num) { struct { - cycles_t cycles; long jiffies; + unsigned cycles; unsigned num; } sample; long delta, delta2, delta3; @@ -637,7 +637,11 @@ static void add_timer_randomness(struct timer_rand_state *state, unsigned num) goto out; sample.jiffies = jiffies; - sample.cycles = get_cycles(); + + /* Use arch random value, fall back to cycles */ + if (!arch_get_random_int(&sample.cycles)) + sample.cycles = get_cycles(); + sample.num = num; mix_pool_bytes(&input_pool, &sample, sizeof(sample)); @@ -961,6 +965,7 @@ EXPORT_SYMBOL(get_random_bytes); */ static void init_std_data(struct entropy_store *r) { + int i; ktime_t now; unsigned long flags; @@ -970,6 +975,11 @@ static void init_std_data(struct entropy_store *r) now = ktime_get_real(); mix_pool_bytes(r, &now, sizeof(now)); + for (i = r->poolinfo->POOLBYTES; i > 0; i -= sizeof flags) { + if (!arch_get_random_long(&flags)) + break; + mix_pool_bytes(r, &flags, sizeof(flags)); + } mix_pool_bytes(r, utsname(), sizeof(*(utsname()))); } |