diff mbox series

[v3,4/5] random: always wake up entropy writers after extraction

Message ID 20220205160118.252698-5-Jason@zx2c4.com
State New
Headers show
Series random: use computational hash for entropy extraction, and related fixes | expand

Commit Message

Jason A. Donenfeld Feb. 5, 2022, 4:01 p.m. UTC 
Now that POOL_BITS == POOL_MIN_BITS, we must unconditionally wake up
entropy writers after every extraction. Therefore there's no point of
write_wakeup_threshold, so we can move it to the dustbin of unused
compatibility sysctls. While we're at it, we can fix a small comparison
where we were waking up after <= min rather than < min.

Suggested-by: Eric Biggers <ebiggers@kernel.org>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
---
 drivers/char/random.c | 35 ++++++++++++-----------------------
 1 file changed, 12 insertions(+), 23 deletions(-)

Comments

Dominik Brodowski Feb. 5, 2022, 6 p.m. UTC | #1 
Am Sat, Feb 05, 2022 at 05:01:17PM +0100 schrieb Jason A. Donenfeld:
> Now that POOL_BITS == POOL_MIN_BITS, we must unconditionally wake up
> entropy writers after every extraction. Therefore there's no point of
> write_wakeup_threshold, so we can move it to the dustbin of unused
> compatibility sysctls. While we're at it, we can fix a small comparison
> where we were waking up after <= min rather than < min.
> 
> Suggested-by: Eric Biggers <ebiggers@kernel.org>
> Cc: Theodore Ts'o <tytso@mit.edu>
> Cc: Dominik Brodowski <linux@dominikbrodowski.net>
> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

	Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net>

Thanks,
	Dominik
Jason A. Donenfeld Feb. 5, 2022, 10:38 p.m. UTC | #2 
A small correction in this:

On Sat, Feb 5, 2022 at 5:02 PM Jason A. Donenfeld <Jason@zx2c4.com> wrote:
> -               .mode           = 0644,
> +               .mode           = 0444,

We actually need to keep this at 644, so as not to break things that
rely on it. It will still do nothing, which is the same choice made
with "urandom_min_reseed_secs" - it's there but doesn't control
anything. So the above snippet is gone.
diff mbox series

Patch

diff --git a/drivers/char/random.c b/drivers/char/random.c
index d0ec8503941e..82ec3a0399fb 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -296,12 +296,6 @@  enum {
  */
 static DECLARE_WAIT_QUEUE_HEAD(random_write_wait);
 static struct fasync_struct *fasync;
-/*
- * If the entropy count falls under this number of bits, then we
- * should wake up processes which are selecting or polling on write
- * access to /dev/random.
- */
-static int random_write_wakeup_bits = POOL_MIN_BITS;
 
 static DEFINE_SPINLOCK(random_ready_list_lock);
 static LIST_HEAD(random_ready_list);
@@ -739,10 +733,8 @@  static void crng_reseed(struct crng_state *crng)
 				return;
 		} while (cmpxchg(&input_pool.entropy_count, entropy_count, 0) != entropy_count);
 		extract_entropy(buf.key, sizeof(buf.key));
-		if (random_write_wakeup_bits) {
-			wake_up_interruptible(&random_write_wait);
-			kill_fasync(&fasync, SIGIO, POLL_OUT);
-		}
+		wake_up_interruptible(&random_write_wait);
+		kill_fasync(&fasync, SIGIO, POLL_OUT);
 	} else {
 		_extract_crng(&primary_crng, buf.block);
 		_crng_backtrack_protect(&primary_crng, buf.block,
@@ -1471,7 +1463,7 @@  static __poll_t random_poll(struct file *file, poll_table *wait)
 	mask = 0;
 	if (crng_ready())
 		mask |= EPOLLIN | EPOLLRDNORM;
-	if (input_pool.entropy_count < random_write_wakeup_bits)
+	if (input_pool.entropy_count < POOL_MIN_BITS)
 		mask |= EPOLLOUT | EPOLLWRNORM;
 	return mask;
 }
@@ -1556,7 +1548,7 @@  static long random_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
 		 */
 		if (!capable(CAP_SYS_ADMIN))
 			return -EPERM;
-		if (xchg(&input_pool.entropy_count, 0) && random_write_wakeup_bits) {
+		if (xchg(&input_pool.entropy_count, 0)) {
 			wake_up_interruptible(&random_write_wait);
 			kill_fasync(&fasync, SIGIO, POLL_OUT);
 		}
@@ -1636,9 +1628,9 @@  SYSCALL_DEFINE3(getrandom, char __user *, buf, size_t, count, unsigned int,
 
 #include <linux/sysctl.h>
 
-static int min_write_thresh;
-static int max_write_thresh = POOL_BITS;
 static int random_min_urandom_seed = 60;
+static int random_write_wakeup_bits = POOL_MIN_BITS;
+static int sysctl_poolsize = POOL_BITS;
 static char sysctl_bootid[16];
 
 /*
@@ -1677,7 +1669,6 @@  static int proc_do_uuid(struct ctl_table *table, int write, void *buffer,
 	return proc_dostring(&fake_table, write, buffer, lenp, ppos);
 }
 
-static int sysctl_poolsize = POOL_BITS;
 static struct ctl_table random_table[] = {
 	{
 		.procname	= "poolsize",
@@ -1697,10 +1688,8 @@  static struct ctl_table random_table[] = {
 		.procname	= "write_wakeup_threshold",
 		.data		= &random_write_wakeup_bits,
 		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec_minmax,
-		.extra1		= &min_write_thresh,
-		.extra2		= &max_write_thresh,
+		.mode		= 0444,
+		.proc_handler	= proc_dointvec,
 	},
 	{
 		.procname	= "urandom_min_reseed_secs",
@@ -1892,13 +1881,13 @@  void add_hwgenerator_randomness(const char *buffer, size_t count,
 	}
 
 	/* Throttle writing if we're above the trickle threshold.
-	 * We'll be woken up again once below random_write_wakeup_thresh,
-	 * when the calling thread is about to terminate, or once
-	 * CRNG_RESEED_INTERVAL has lapsed.
+	 * We'll be woken up again once below POOL_MIN_BITS, when
+	 * the calling thread is about to terminate, or once
+	 * CRNG_RESEED_INTERVAL has elapsed.
 	 */
 	wait_event_interruptible_timeout(random_write_wait,
 			!system_wq || kthread_should_stop() ||
-			input_pool.entropy_count <= random_write_wakeup_bits,
+			input_pool.entropy_count < POOL_MIN_BITS,
 			CRNG_RESEED_INTERVAL);
 	mix_pool_bytes(buffer, count);
 	credit_entropy_bits(entropy);