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Random number generator fixes for Linux 5.19-rc4.

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Merge tag 'random-5.19-rc4-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/crng/random

Pull random number generator fixes from Jason Donenfeld:

 - A change to schedule the interrupt randomness mixing less often, yet
   credit a little more each time, to reduce overhead during interrupt
   storms.

 - Squelch an undesired pr_warn() from __ratelimit(), which was causing
   problems in the reporters' CI.

 - A trivial comment fix.

* tag 'random-5.19-rc4-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/crng/random:
  random: update comment from copy_to_user() -> copy_to_iter()
  random: quiet urandom warning ratelimit suppression message
  random: schedule mix_interrupt_randomness() less often
This commit is contained in:
Linus Torvalds 2022-06-23 14:00:49 -05:00
commit ba461afbef
2 changed files with 11 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/char/random.c
View File

@ -87,7 +87,7 @@ static struct fasync_struct *fasync;
/* Control how we warn userspace. */
static struct ratelimit_state urandom_warning =
RATELIMIT_STATE_INIT("warn_urandom_randomness", HZ, 3);
RATELIMIT_STATE_INIT_FLAGS("urandom_warning", HZ, 3, RATELIMIT_MSG_ON_RELEASE);
static int ratelimit_disable __read_mostly =
IS_ENABLED(CONFIG_WARN_ALL_UNSEEDED_RANDOM);
module_param_named(ratelimit_disable, ratelimit_disable, int, 0644);
@ -408,7 +408,7 @@ static ssize_t get_random_bytes_user(struct iov_iter *iter)
/*
* Immediately overwrite the ChaCha key at index 4 with random
* bytes, in case userspace causes copy_to_user() below to sleep
* bytes, in case userspace causes copy_to_iter() below to sleep
* forever, so that we still retain forward secrecy in that case.
*/
crng_make_state(chacha_state, (u8 *)&chacha_state[4], CHACHA_KEY_SIZE);
@ -1009,7 +1009,7 @@ void add_interrupt_randomness(int irq)
if (new_count & MIX_INFLIGHT)
return;
if (new_count < 64 && !time_is_before_jiffies(fast_pool->last + HZ))
if (new_count < 1024 && !time_is_before_jiffies(fast_pool->last + HZ))
return;
if (unlikely(!fast_pool->mix.func))

12
include/linux/ratelimit_types.h
View File

@ -23,12 +23,16 @@ struct ratelimit_state {
unsigned long flags;
};
#define RATELIMIT_STATE_INIT(name, interval_init, burst_init) { \
.lock = __RAW_SPIN_LOCK_UNLOCKED(name.lock), \
.interval = interval_init, \
.burst = burst_init, \
#define RATELIMIT_STATE_INIT_FLAGS(name, interval_init, burst_init, flags_init) { \
.lock = __RAW_SPIN_LOCK_UNLOCKED(name.lock), \
.interval = interval_init, \
.burst = burst_init, \
.flags = flags_init, \
}
#define RATELIMIT_STATE_INIT(name, interval_init, burst_init) \
RATELIMIT_STATE_INIT_FLAGS(name, interval_init, burst_init, 0)
#define RATELIMIT_STATE_INIT_DISABLED \
RATELIMIT_STATE_INIT(ratelimit_state, 0, DEFAULT_RATELIMIT_BURST)