Patch "random: print a warning for the first ten uninitialized random users" has been added to the 4.7-stable tree

This is a note to let you know that I've just added the patch titled

random: print a warning for the first ten uninitialized random users

to the 4.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
random-print-a-warning-for-the-first-ten-uninitialized-random-users.patch
and it can be found in the queue-4.7 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Theodore Ts'o <[email protected]>
Date: Mon, 13 Jun 2016 10:10:51 -0400
Subject: random: print a warning for the first ten uninitialized random users

From: Theodore Ts'o <[email protected]>

commit 9b4d008787f864f17d008c9c15bbe8a0f7e2fc24 upstream.

Since systemd is consistently using /dev/urandom before it is initialized, we can't see the other potentially dangerous users of /dev/urandom immediately after boot. So print the first ten such complaints instead.

---
 drivers/char/random.c |   12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

@@ -1462,12 +1462,16 @@ random_read(struct file *file, char __us
 static ssize_t
 urandom_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
 {
+	static int maxwarn = 10;
 	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);
+	if (unlikely(nonblocking_pool.initialized == 0) &&
+	    maxwarn > 0) {
+		maxwarn--;
+		printk(KERN_NOTICE "random: %s: uninitialized urandom read "
+		       "(%zd bytes read, %d bits of entropy available)\n",
+		       current->comm, nbytes, nonblocking_pool.entropy_total);
+	}
 
 	nbytes = min_t(size_t, nbytes, INT_MAX >> (ENTROPY_SHIFT + 3));
 	ret = extract_entropy_user(&nonblocking_pool, buf, nbytes);

Patches currently in stable-queue which might be from [email protected] are

queue-4.7/random-print-a-warning-for-the-first-ten-uninitialized-random-users.patch queue-4.7/random-properly-align-get_random_int_hash.patch queue-4.7/random-initialize-the-non-blocking-pool-via-add_hwgenerator_randomness.patch queue-4.7/random-add-interrupt-callback-to-vmbus-irq-handler.patch queue-4.7/jbd2-make-journal-y2038-safe.patch