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Commit 301f0595 authored by Theodore Ts'o's avatar Theodore Ts'o
Browse files

random: printk notifications for urandom pool initialization 



Print a notification to the console when the nonblocking pool is
initialized.  Also printk a warning when a process tries reading from
/dev/urandom before it is fully initialized.

Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent 40db23e5

drivers/char/random.c

+11 −1
Original line number Diff line number Diff line
@@ -655,6 +655,9 @@ static void credit_entropy_bits(struct entropy_store *r, int nbits) 
	r->entropy_total += nbits;

	if (!r->initialized && nbits > 0) {

		if (r->entropy_total > 128) {

			if (r == &nonblocking_pool)

				pr_notice("random: %s pool is initialized\n",

					  r->name);

			r->initialized = 1;

			r->entropy_total = 0;

		}
@@ -1327,7 +1330,14 @@ random_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos) 
static ssize_t

urandom_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)

{

	int ret = extract_entropy_user(&nonblocking_pool, buf, nbytes);

	int ret;



	if (unlikely(nonblocking_pool.initialized == 0))

		printk_once(KERN_NOTICE "random: %s urandom read "

			    "with %d bits of entropy available\n",

			    current->comm, nonblocking_pool.entropy_total);



	ret = extract_entropy_user(&nonblocking_pool, buf, nbytes);



	trace_urandom_read(8 * nbytes, ENTROPY_BITS(&nonblocking_pool),

			   ENTROPY_BITS(&input_pool));