From ae9ecd92ddabc250817baa7eb401df3cfbd4c2da Mon Sep 17 00:00:00 2001 From: Theodore Ts'o Date: Sun, 3 Nov 2013 07:56:17 -0500 Subject: random: don't zap entropy count in rand_initialize() The rand_initialize() function was being run fairly late in the kernel boot sequence. This was unfortunate, since it zero'ed the entropy counters, thus throwing away credit that was accumulated earlier in the boot sequence, and it also meant that initcall functions run before rand_initialize were using a minimally initialized pool. To fix this, fix init_std_data() to no longer zap the entropy counter; it wasn't necessary, and move rand_initialize() to be an early initcall. Signed-off-by: "Theodore Ts'o" --- drivers/char/random.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) (limited to 'drivers/char') diff --git a/drivers/char/random.c b/drivers/char/random.c index a19a7a63ec3..a38d97a2145 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -1228,14 +1228,11 @@ static void init_std_data(struct entropy_store *r) ktime_t now = ktime_get_real(); unsigned long rv; - r->entropy_count = 0; - r->entropy_total = 0; - r->last_data_init = 0; r->last_pulled = jiffies; mix_pool_bytes(r, &now, sizeof(now), NULL); for (i = r->poolinfo->poolbytes; i > 0; i -= sizeof(rv)) { if (!arch_get_random_long(&rv)) - break; + rv = random_get_entropy(); mix_pool_bytes(r, &rv, sizeof(rv), NULL); } mix_pool_bytes(r, utsname(), sizeof(*(utsname())), NULL); @@ -1258,7 +1255,7 @@ static int rand_initialize(void) init_std_data(&nonblocking_pool); return 0; } -module_init(rand_initialize); +early_initcall(rand_initialize); #ifdef CONFIG_BLOCK void rand_initialize_disk(struct gendisk *disk) @@ -1433,10 +1430,15 @@ static long random_ioctl(struct file *f, unsigned int cmd, unsigned long arg) return 0; case RNDZAPENTCNT: case RNDCLEARPOOL: - /* Clear the entropy pool counters. */ + /* + * Clear the entropy pool counters. We no longer clear + * the entropy pool, as that's silly. + */ if (!capable(CAP_SYS_ADMIN)) return -EPERM; - rand_initialize(); + input_pool.entropy_count = 0; + nonblocking_pool.entropy_count = 0; + blocking_pool.entropy_count = 0; return 0; default: return -EINVAL; -- cgit v1.2.3-70-g09d2