ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/drivers/char/random.c b/marvell/linux/drivers/char/random.c
new file mode 100644
index 0000000..364dd5e
--- /dev/null
+++ b/marvell/linux/drivers/char/random.c
@@ -0,0 +1,1529 @@
+// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
+/*
+ * Copyright (C) 2017-2022 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ * Copyright Matt Mackall <mpm@selenic.com>, 2003, 2004, 2005
+ * Copyright Theodore Ts'o, 1994, 1995, 1996, 1997, 1998, 1999. All rights reserved.
+ *
+ * This driver produces cryptographically secure pseudorandom data. It is divided
+ * into roughly six sections, each with a section header:
+ *
+ * - Initialization and readiness waiting.
+ * - Fast key erasure RNG, the "crng".
+ * - Entropy accumulation and extraction routines.
+ * - Entropy collection routines.
+ * - Userspace reader/writer interfaces.
+ * - Sysctl interface.
+ *
+ * The high level overview is that there is one input pool, into which
+ * various pieces of data are hashed. Prior to initialization, some of that
+ * data is then "credited" as having a certain number of bits of entropy.
+ * When enough bits of entropy are available, the hash is finalized and
+ * handed as a key to a stream cipher that expands it indefinitely for
+ * various consumers. This key is periodically refreshed as the various
+ * entropy collectors, described below, add data to the input pool.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/utsname.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/slab.h>
+#include <linux/random.h>
+#include <linux/poll.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/genhd.h>
+#include <linux/interrupt.h>
+#include <linux/mm.h>
+#include <linux/nodemask.h>
+#include <linux/spinlock.h>
+#include <linux/kthread.h>
+#include <linux/percpu.h>
+#include <linux/ptrace.h>
+#include <linux/workqueue.h>
+#include <linux/irq.h>
+#include <linux/ratelimit.h>
+#include <linux/syscalls.h>
+#include <linux/completion.h>
+#include <linux/uuid.h>
+#include <linux/uaccess.h>
+#include <linux/siphash.h>
+#include <linux/uio.h>
+#include <crypto/chacha.h>
+#include <crypto/blake2s.h>
+#include <asm/processor.h>
+#include <asm/irq.h>
+#include <asm/irq_regs.h>
+#include <asm/io.h>
+
+/*********************************************************************
+ *
+ * Initialization and readiness waiting.
+ *
+ * Much of the RNG infrastructure is devoted to various dependencies
+ * being able to wait until the RNG has collected enough entropy and
+ * is ready for safe consumption.
+ *
+ *********************************************************************/
+
+/*
+ * crng_init is protected by base_crng->lock, and only increases
+ * its value (from empty->early->ready).
+ */
+static enum {
+ CRNG_EMPTY = 0, /* Little to no entropy collected */
+ CRNG_EARLY = 1, /* At least POOL_EARLY_BITS collected */
+ CRNG_READY = 2 /* Fully initialized with POOL_READY_BITS collected */
+} crng_init __read_mostly = CRNG_EMPTY;
+#define crng_ready() (likely(crng_init >= CRNG_READY))
+/* Various types of waiters for crng_init->CRNG_READY transition. */
+static DECLARE_WAIT_QUEUE_HEAD(crng_init_wait);
+static struct fasync_struct *fasync;
+static DEFINE_SPINLOCK(random_ready_chain_lock);
+static RAW_NOTIFIER_HEAD(random_ready_chain);
+
+/* Control how we warn userspace. */
+static struct ratelimit_state urandom_warning =
+ 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);
+MODULE_PARM_DESC(ratelimit_disable, "Disable random ratelimit suppression");
+
+/*
+ * Returns whether or not the input pool has been seeded and thus guaranteed
+ * to supply cryptographically secure random numbers. This applies to: the
+ * /dev/urandom device, the get_random_bytes function, and the get_random_{u32,
+ * ,u64,int,long} family of functions.
+ *
+ * Returns: true if the input pool has been seeded.
+ * false if the input pool has not been seeded.
+ */
+bool rng_is_initialized(void)
+{
+ return crng_ready();
+}
+EXPORT_SYMBOL(rng_is_initialized);
+
+/* Used by wait_for_random_bytes(), and considered an entropy collector, below. */
+static void try_to_generate_entropy(void);
+
+/*
+ * Wait for the input pool to be seeded and thus guaranteed to supply
+ * cryptographically secure random numbers. This applies to: the /dev/urandom
+ * device, the get_random_bytes function, and the get_random_{u32,u64,int,long}
+ * family of functions. Using any of these functions without first calling
+ * this function forfeits the guarantee of security.
+ *
+ * Returns: 0 if the input pool has been seeded.
+ * -ERESTARTSYS if the function was interrupted by a signal.
+ */
+int wait_for_random_bytes(void)
+{
+ while (!crng_ready()) {
+ int ret;
+
+ try_to_generate_entropy();
+ ret = wait_event_interruptible_timeout(crng_init_wait, crng_ready(), HZ);
+ if (ret)
+ return ret > 0 ? 0 : ret;
+ }
+ return 0;
+}
+EXPORT_SYMBOL(wait_for_random_bytes);
+
+/*
+ * Add a callback function that will be invoked when the input
+ * pool is initialised.
+ *
+ * returns: 0 if callback is successfully added
+ * -EALREADY if pool is already initialised (callback not called)
+ */
+int __cold register_random_ready_notifier(struct notifier_block *nb)
+{
+ unsigned long flags;
+ int ret = -EALREADY;
+
+ if (crng_ready())
+ return ret;
+
+ spin_lock_irqsave(&random_ready_chain_lock, flags);
+ if (!crng_ready())
+ ret = raw_notifier_chain_register(&random_ready_chain, nb);
+ spin_unlock_irqrestore(&random_ready_chain_lock, flags);
+ return ret;
+}
+
+/*
+ * Delete a previously registered readiness callback function.
+ */
+int __cold unregister_random_ready_notifier(struct notifier_block *nb)
+{
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&random_ready_chain_lock, flags);
+ ret = raw_notifier_chain_unregister(&random_ready_chain, nb);
+ spin_unlock_irqrestore(&random_ready_chain_lock, flags);
+ return ret;
+}
+
+static void __cold process_random_ready_list(void)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&random_ready_chain_lock, flags);
+ raw_notifier_call_chain(&random_ready_chain, 0, NULL);
+ spin_unlock_irqrestore(&random_ready_chain_lock, flags);
+}
+
+#define warn_unseeded_randomness() \
+ if (IS_ENABLED(CONFIG_WARN_ALL_UNSEEDED_RANDOM) && !crng_ready()) \
+ printk_deferred(KERN_NOTICE "random: %s called from %pS with crng_init=%d\n", \
+ __func__, (void *)_RET_IP_, crng_init)
+
+
+/*********************************************************************
+ *
+ * Fast key erasure RNG, the "crng".
+ *
+ * These functions expand entropy from the entropy extractor into
+ * long streams for external consumption using the "fast key erasure"
+ * RNG described at <https://blog.cr.yp.to/20170723-random.html>.
+ *
+ * There are a few exported interfaces for use by other drivers:
+ *
+ * void get_random_bytes(void *buf, size_t len)
+ * u32 get_random_u32()
+ * u64 get_random_u64()
+ * unsigned int get_random_int()
+ * unsigned long get_random_long()
+ *
+ * These interfaces will return the requested number of random bytes
+ * into the given buffer or as a return value. This is equivalent to
+ * a read from /dev/urandom. The u32, u64, int, and long family of
+ * functions may be higher performance for one-off random integers,
+ * because they do a bit of buffering and do not invoke reseeding
+ * until the buffer is emptied.
+ *
+ *********************************************************************/
+
+enum {
+ CRNG_RESEED_START_INTERVAL = HZ,
+ CRNG_RESEED_INTERVAL = 60 * HZ
+};
+
+static struct {
+ u8 key[CHACHA_KEY_SIZE] __aligned(__alignof__(long));
+ unsigned long birth;
+ unsigned long generation;
+ spinlock_t lock;
+} base_crng = {
+ .lock = __SPIN_LOCK_UNLOCKED(base_crng.lock)
+};
+
+struct crng {
+ u8 key[CHACHA_KEY_SIZE];
+ unsigned long generation;
+};
+
+static DEFINE_PER_CPU(struct crng, crngs) = {
+ .generation = ULONG_MAX
+};
+
+/* Used by crng_reseed() and crng_make_state() to extract a new seed from the input pool. */
+static void extract_entropy(void *buf, size_t len);
+
+/* This extracts a new crng key from the input pool. */
+static void crng_reseed(void)
+{
+ unsigned long flags;
+ unsigned long next_gen;
+ u8 key[CHACHA_KEY_SIZE];
+
+ extract_entropy(key, sizeof(key));
+
+ /*
+ * We copy the new key into the base_crng, overwriting the old one,
+ * and update the generation counter. We avoid hitting ULONG_MAX,
+ * because the per-cpu crngs are initialized to ULONG_MAX, so this
+ * forces new CPUs that come online to always initialize.
+ */
+ spin_lock_irqsave(&base_crng.lock, flags);
+ memcpy(base_crng.key, key, sizeof(base_crng.key));
+ next_gen = base_crng.generation + 1;
+ if (next_gen == ULONG_MAX)
+ ++next_gen;
+ WRITE_ONCE(base_crng.generation, next_gen);
+ WRITE_ONCE(base_crng.birth, jiffies);
+ if (!crng_ready())
+ crng_init = CRNG_READY;
+ spin_unlock_irqrestore(&base_crng.lock, flags);
+ memzero_explicit(key, sizeof(key));
+}
+
+/*
+ * This generates a ChaCha block using the provided key, and then
+ * immediately overwites that key with half the block. It returns
+ * the resultant ChaCha state to the user, along with the second
+ * half of the block containing 32 bytes of random data that may
+ * be used; random_data_len may not be greater than 32.
+ *
+ * The returned ChaCha state contains within it a copy of the old
+ * key value, at index 4, so the state should always be zeroed out
+ * immediately after using in order to maintain forward secrecy.
+ * If the state cannot be erased in a timely manner, then it is
+ * safer to set the random_data parameter to &chacha_state[4] so
+ * that this function overwrites it before returning.
+ */
+static void crng_fast_key_erasure(u8 key[CHACHA_KEY_SIZE],
+ u32 chacha_state[CHACHA_BLOCK_SIZE / sizeof(u32)],
+ u8 *random_data, size_t random_data_len)
+{
+ u8 first_block[CHACHA_BLOCK_SIZE];
+
+ BUG_ON(random_data_len > 32);
+
+ chacha_init_consts(chacha_state);
+ memcpy(&chacha_state[4], key, CHACHA_KEY_SIZE);
+ memset(&chacha_state[12], 0, sizeof(u32) * 4);
+ chacha20_block(chacha_state, first_block);
+
+ memcpy(key, first_block, CHACHA_KEY_SIZE);
+ memcpy(random_data, first_block + CHACHA_KEY_SIZE, random_data_len);
+ memzero_explicit(first_block, sizeof(first_block));
+}
+
+/*
+ * Return whether the crng seed is considered to be sufficiently old
+ * that a reseeding is needed. This happens if the last reseeding
+ * was CRNG_RESEED_INTERVAL ago, or during early boot, at an interval
+ * proportional to the uptime.
+ */
+static bool crng_has_old_seed(void)
+{
+ static bool early_boot = true;
+ unsigned long interval = CRNG_RESEED_INTERVAL;
+
+ if (unlikely(READ_ONCE(early_boot))) {
+ time64_t uptime = ktime_get_seconds();
+ if (uptime >= CRNG_RESEED_INTERVAL / HZ * 2)
+ WRITE_ONCE(early_boot, false);
+ else
+ interval = max_t(unsigned int, CRNG_RESEED_START_INTERVAL,
+ (unsigned int)uptime / 2 * HZ);
+ }
+ return time_is_before_jiffies(READ_ONCE(base_crng.birth) + interval);
+}
+
+/*
+ * This function returns a ChaCha state that you may use for generating
+ * random data. It also returns up to 32 bytes on its own of random data
+ * that may be used; random_data_len may not be greater than 32.
+ */
+static void crng_make_state(u32 chacha_state[CHACHA_BLOCK_SIZE / sizeof(u32)],
+ u8 *random_data, size_t random_data_len)
+{
+ unsigned long flags;
+ struct crng *crng;
+
+ BUG_ON(random_data_len > 32);
+
+ /*
+ * For the fast path, we check whether we're ready, unlocked first, and
+ * then re-check once locked later. In the case where we're really not
+ * ready, we do fast key erasure with the base_crng directly, extracting
+ * when crng_init is CRNG_EMPTY.
+ */
+ if (!crng_ready()) {
+ bool ready;
+
+ spin_lock_irqsave(&base_crng.lock, flags);
+ ready = crng_ready();
+ if (!ready) {
+ if (crng_init == CRNG_EMPTY)
+ extract_entropy(base_crng.key, sizeof(base_crng.key));
+ crng_fast_key_erasure(base_crng.key, chacha_state,
+ random_data, random_data_len);
+ }
+ spin_unlock_irqrestore(&base_crng.lock, flags);
+ if (!ready)
+ return;
+ }
+
+ /*
+ * If the base_crng is old enough, we reseed, which in turn bumps the
+ * generation counter that we check below.
+ */
+ if (unlikely(crng_has_old_seed()))
+ crng_reseed();
+
+ local_irq_save(flags);
+ crng = raw_cpu_ptr(&crngs);
+
+ /*
+ * If our per-cpu crng is older than the base_crng, then it means
+ * somebody reseeded the base_crng. In that case, we do fast key
+ * erasure on the base_crng, and use its output as the new key
+ * for our per-cpu crng. This brings us up to date with base_crng.
+ */
+ if (unlikely(crng->generation != READ_ONCE(base_crng.generation))) {
+ spin_lock(&base_crng.lock);
+ crng_fast_key_erasure(base_crng.key, chacha_state,
+ crng->key, sizeof(crng->key));
+ crng->generation = base_crng.generation;
+ spin_unlock(&base_crng.lock);
+ }
+
+ /*
+ * Finally, when we've made it this far, our per-cpu crng has an up
+ * to date key, and we can do fast key erasure with it to produce
+ * some random data and a ChaCha state for the caller. All other
+ * branches of this function are "unlikely", so most of the time we
+ * should wind up here immediately.
+ */
+ crng_fast_key_erasure(crng->key, chacha_state, random_data, random_data_len);
+ local_irq_restore(flags);
+}
+
+static void _get_random_bytes(void *buf, size_t len)
+{
+ u32 chacha_state[CHACHA_BLOCK_SIZE / sizeof(u32)];
+ u8 tmp[CHACHA_BLOCK_SIZE];
+ size_t first_block_len;
+
+ if (!len)
+ return;
+
+ first_block_len = min_t(size_t, 32, len);
+ crng_make_state(chacha_state, buf, first_block_len);
+ len -= first_block_len;
+ buf += first_block_len;
+
+ while (len) {
+ if (len < CHACHA_BLOCK_SIZE) {
+ chacha20_block(chacha_state, tmp);
+ memcpy(buf, tmp, len);
+ memzero_explicit(tmp, sizeof(tmp));
+ break;
+ }
+
+ chacha20_block(chacha_state, buf);
+ if (unlikely(chacha_state[12] == 0))
+ ++chacha_state[13];
+ len -= CHACHA_BLOCK_SIZE;
+ buf += CHACHA_BLOCK_SIZE;
+ }
+
+ memzero_explicit(chacha_state, sizeof(chacha_state));
+}
+
+/*
+ * This function is the exported kernel interface. It returns some
+ * number of good random numbers, suitable for key generation, seeding
+ * TCP sequence numbers, etc. It does not rely on the hardware random
+ * number generator. For random bytes direct from the hardware RNG
+ * (when available), use get_random_bytes_arch(). In order to ensure
+ * that the randomness provided by this function is okay, the function
+ * wait_for_random_bytes() should be called and return 0 at least once
+ * at any point prior.
+ */
+void get_random_bytes(void *buf, size_t len)
+{
+ warn_unseeded_randomness();
+ _get_random_bytes(buf, len);
+}
+EXPORT_SYMBOL(get_random_bytes);
+
+static ssize_t get_random_bytes_user(struct iov_iter *iter)
+{
+ u32 chacha_state[CHACHA_BLOCK_SIZE / sizeof(u32)];
+ u8 block[CHACHA_BLOCK_SIZE];
+ size_t ret = 0, copied;
+
+ if (unlikely(!iov_iter_count(iter)))
+ return 0;
+
+ /*
+ * Immediately overwrite the ChaCha key at index 4 with random
+ * 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);
+ /*
+ * However, if we're doing a read of len <= 32, we don't need to
+ * use chacha_state after, so we can simply return those bytes to
+ * the user directly.
+ */
+ if (iov_iter_count(iter) <= CHACHA_KEY_SIZE) {
+ ret = copy_to_iter(&chacha_state[4], CHACHA_KEY_SIZE, iter);
+ goto out_zero_chacha;
+ }
+
+ for (;;) {
+ chacha20_block(chacha_state, block);
+ if (unlikely(chacha_state[12] == 0))
+ ++chacha_state[13];
+
+ copied = copy_to_iter(block, sizeof(block), iter);
+ ret += copied;
+ if (!iov_iter_count(iter) || copied != sizeof(block))
+ break;
+
+ BUILD_BUG_ON(PAGE_SIZE % sizeof(block) != 0);
+ if (ret % PAGE_SIZE == 0) {
+ if (signal_pending(current))
+ break;
+ cond_resched();
+ }
+ }
+
+ memzero_explicit(block, sizeof(block));
+out_zero_chacha:
+ memzero_explicit(chacha_state, sizeof(chacha_state));
+ return ret ? ret : -EFAULT;
+}
+
+/*
+ * Batched entropy returns random integers. The quality of the random
+ * number is good as /dev/urandom. In order to ensure that the randomness
+ * provided by this function is okay, the function wait_for_random_bytes()
+ * should be called and return 0 at least once at any point prior.
+ */
+
+#define DEFINE_BATCHED_ENTROPY(type) \
+struct batch_ ##type { \
+ /* \
+ * We make this 1.5x a ChaCha block, so that we get the \
+ * remaining 32 bytes from fast key erasure, plus one full \
+ * block from the detached ChaCha state. We can increase \
+ * the size of this later if needed so long as we keep the \
+ * formula of (integer_blocks + 0.5) * CHACHA_BLOCK_SIZE. \
+ */ \
+ type entropy[CHACHA_BLOCK_SIZE * 3 / (2 * sizeof(type))]; \
+ unsigned long generation; \
+ unsigned int position; \
+}; \
+ \
+static DEFINE_PER_CPU(struct batch_ ##type, batched_entropy_ ##type) = { \
+ .position = UINT_MAX \
+}; \
+ \
+type get_random_ ##type(void) \
+{ \
+ type ret; \
+ unsigned long flags; \
+ struct batch_ ##type *batch; \
+ unsigned long next_gen; \
+ \
+ warn_unseeded_randomness(); \
+ \
+ if (!crng_ready()) { \
+ _get_random_bytes(&ret, sizeof(ret)); \
+ return ret; \
+ } \
+ \
+ local_irq_save(flags); \
+ batch = raw_cpu_ptr(&batched_entropy_##type); \
+ \
+ next_gen = READ_ONCE(base_crng.generation); \
+ if (batch->position >= ARRAY_SIZE(batch->entropy) || \
+ next_gen != batch->generation) { \
+ _get_random_bytes(batch->entropy, sizeof(batch->entropy)); \
+ batch->position = 0; \
+ batch->generation = next_gen; \
+ } \
+ \
+ ret = batch->entropy[batch->position]; \
+ batch->entropy[batch->position] = 0; \
+ ++batch->position; \
+ local_irq_restore(flags); \
+ return ret; \
+} \
+EXPORT_SYMBOL(get_random_ ##type);
+
+DEFINE_BATCHED_ENTROPY(u64)
+DEFINE_BATCHED_ENTROPY(u32)
+
+#ifdef CONFIG_SMP
+/*
+ * This function is called when the CPU is coming up, with entry
+ * CPUHP_RANDOM_PREPARE, which comes before CPUHP_WORKQUEUE_PREP.
+ */
+int __cold random_prepare_cpu(unsigned int cpu)
+{
+ /*
+ * When the cpu comes back online, immediately invalidate both
+ * the per-cpu crng and all batches, so that we serve fresh
+ * randomness.
+ */
+ per_cpu_ptr(&crngs, cpu)->generation = ULONG_MAX;
+ per_cpu_ptr(&batched_entropy_u32, cpu)->position = UINT_MAX;
+ per_cpu_ptr(&batched_entropy_u64, cpu)->position = UINT_MAX;
+ return 0;
+}
+#endif
+
+/*
+ * This function will use the architecture-specific hardware random
+ * number generator if it is available. It is not recommended for
+ * use. Use get_random_bytes() instead. It returns the number of
+ * bytes filled in.
+ */
+size_t __must_check get_random_bytes_arch(void *buf, size_t len)
+{
+ size_t left = len;
+ u8 *p = buf;
+
+ while (left) {
+ unsigned long v;
+ size_t block_len = min_t(size_t, left, sizeof(unsigned long));
+
+ if (!arch_get_random_long(&v))
+ break;
+
+ memcpy(p, &v, block_len);
+ p += block_len;
+ left -= block_len;
+ }
+
+ return len - left;
+}
+EXPORT_SYMBOL(get_random_bytes_arch);
+
+
+/**********************************************************************
+ *
+ * Entropy accumulation and extraction routines.
+ *
+ * Callers may add entropy via:
+ *
+ * static void mix_pool_bytes(const void *buf, size_t len)
+ *
+ * After which, if added entropy should be credited:
+ *
+ * static void credit_init_bits(size_t bits)
+ *
+ * Finally, extract entropy via:
+ *
+ * static void extract_entropy(void *buf, size_t len)
+ *
+ **********************************************************************/
+
+enum {
+ POOL_BITS = BLAKE2S_HASH_SIZE * 8,
+ POOL_READY_BITS = POOL_BITS, /* When crng_init->CRNG_READY */
+ POOL_EARLY_BITS = POOL_READY_BITS / 2 /* When crng_init->CRNG_EARLY */
+};
+
+static struct {
+ struct blake2s_state hash;
+ spinlock_t lock;
+ unsigned int init_bits;
+} input_pool = {
+ .hash.h = { BLAKE2S_IV0 ^ (0x01010000 | BLAKE2S_HASH_SIZE),
+ BLAKE2S_IV1, BLAKE2S_IV2, BLAKE2S_IV3, BLAKE2S_IV4,
+ BLAKE2S_IV5, BLAKE2S_IV6, BLAKE2S_IV7 },
+ .hash.outlen = BLAKE2S_HASH_SIZE,
+ .lock = __SPIN_LOCK_UNLOCKED(input_pool.lock),
+};
+
+static void _mix_pool_bytes(const void *buf, size_t len)
+{
+ blake2s_update(&input_pool.hash, buf, len);
+}
+
+/*
+ * This function adds bytes into the input pool. It does not
+ * update the initialization bit counter; the caller should call
+ * credit_init_bits if this is appropriate.
+ */
+static void mix_pool_bytes(const void *buf, size_t len)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&input_pool.lock, flags);
+ _mix_pool_bytes(buf, len);
+ spin_unlock_irqrestore(&input_pool.lock, flags);
+}
+
+/*
+ * This is an HKDF-like construction for using the hashed collected entropy
+ * as a PRF key, that's then expanded block-by-block.
+ */
+static void extract_entropy(void *buf, size_t len)
+{
+ unsigned long flags;
+ u8 seed[BLAKE2S_HASH_SIZE], next_key[BLAKE2S_HASH_SIZE];
+ struct {
+ unsigned long rdseed[32 / sizeof(long)];
+ size_t counter;
+ } block;
+ size_t i;
+
+ for (i = 0; i < ARRAY_SIZE(block.rdseed); ++i) {
+ if (!arch_get_random_seed_long(&block.rdseed[i]) &&
+ !arch_get_random_long(&block.rdseed[i]))
+ block.rdseed[i] = random_get_entropy();
+ }
+
+ spin_lock_irqsave(&input_pool.lock, flags);
+
+ /* seed = HASHPRF(last_key, entropy_input) */
+ blake2s_final(&input_pool.hash, seed);
+
+ /* next_key = HASHPRF(seed, RDSEED || 0) */
+ block.counter = 0;
+ blake2s(next_key, (u8 *)&block, seed, sizeof(next_key), sizeof(block), sizeof(seed));
+ blake2s_init_key(&input_pool.hash, BLAKE2S_HASH_SIZE, next_key, sizeof(next_key));
+
+ spin_unlock_irqrestore(&input_pool.lock, flags);
+ memzero_explicit(next_key, sizeof(next_key));
+
+ while (len) {
+ i = min_t(size_t, len, BLAKE2S_HASH_SIZE);
+ /* output = HASHPRF(seed, RDSEED || ++counter) */
+ ++block.counter;
+ blake2s(buf, (u8 *)&block, seed, i, sizeof(block), sizeof(seed));
+ len -= i;
+ buf += i;
+ }
+
+ memzero_explicit(seed, sizeof(seed));
+ memzero_explicit(&block, sizeof(block));
+}
+
+#define credit_init_bits(bits) if (!crng_ready()) _credit_init_bits(bits)
+
+static void __cold _credit_init_bits(size_t bits)
+{
+ unsigned int new, orig, add;
+ unsigned long flags;
+
+ if (!bits)
+ return;
+
+ add = min_t(size_t, bits, POOL_BITS);
+
+ do {
+ orig = READ_ONCE(input_pool.init_bits);
+ new = min_t(unsigned int, POOL_BITS, orig + add);
+ } while (cmpxchg(&input_pool.init_bits, orig, new) != orig);
+
+ if (orig < POOL_READY_BITS && new >= POOL_READY_BITS) {
+ crng_reseed(); /* Sets crng_init to CRNG_READY under base_crng.lock. */
+ process_random_ready_list();
+ wake_up_interruptible(&crng_init_wait);
+ kill_fasync(&fasync, SIGIO, POLL_IN);
+ pr_notice("crng init done\n");
+ if (urandom_warning.missed)
+ pr_notice("%d urandom warning(s) missed due to ratelimiting\n",
+ urandom_warning.missed);
+ } else if (orig < POOL_EARLY_BITS && new >= POOL_EARLY_BITS) {
+ spin_lock_irqsave(&base_crng.lock, flags);
+ /* Check if crng_init is CRNG_EMPTY, to avoid race with crng_reseed(). */
+ if (crng_init == CRNG_EMPTY) {
+ extract_entropy(base_crng.key, sizeof(base_crng.key));
+ crng_init = CRNG_EARLY;
+ }
+ spin_unlock_irqrestore(&base_crng.lock, flags);
+ }
+}
+
+
+/**********************************************************************
+ *
+ * Entropy collection routines.
+ *
+ * The following exported functions are used for pushing entropy into
+ * the above entropy accumulation routines:
+ *
+ * void add_device_randomness(const void *buf, size_t len);
+ * void add_hwgenerator_randomness(const void *buf, size_t len, size_t entropy);
+ * void add_bootloader_randomness(const void *buf, size_t len);
+ * void add_interrupt_randomness(int irq);
+ * void add_input_randomness(unsigned int type, unsigned int code, unsigned int value);
+ * void add_disk_randomness(struct gendisk *disk);
+ *
+ * add_device_randomness() adds data to the input pool that
+ * is likely to differ between two devices (or possibly even per boot).
+ * This would be things like MAC addresses or serial numbers, or the
+ * read-out of the RTC. This does *not* credit any actual entropy to
+ * the pool, but it initializes the pool to different values for devices
+ * that might otherwise be identical and have very little entropy
+ * available to them (particularly common in the embedded world).
+ *
+ * add_hwgenerator_randomness() is for true hardware RNGs, and will credit
+ * entropy as specified by the caller. If the entropy pool is full it will
+ * block until more entropy is needed.
+ *
+ * add_bootloader_randomness() is called by bootloader drivers, such as EFI
+ * and device tree, and credits its input depending on whether or not the
+ * configuration option CONFIG_RANDOM_TRUST_BOOTLOADER is set.
+ *
+ * add_interrupt_randomness() uses the interrupt timing as random
+ * inputs to the entropy pool. Using the cycle counters and the irq source
+ * as inputs, it feeds the input pool roughly once a second or after 64
+ * interrupts, crediting 1 bit of entropy for whichever comes first.
+ *
+ * add_input_randomness() uses the input layer interrupt timing, as well
+ * as the event type information from the hardware.
+ *
+ * add_disk_randomness() uses what amounts to the seek time of block
+ * layer request events, on a per-disk_devt basis, as input to the
+ * entropy pool. Note that high-speed solid state drives with very low
+ * seek times do not make for good sources of entropy, as their seek
+ * times are usually fairly consistent.
+ *
+ * The last two routines try to estimate how many bits of entropy
+ * to credit. They do this by keeping track of the first and second
+ * order deltas of the event timings.
+ *
+ **********************************************************************/
+
+static bool trust_cpu __initdata = IS_ENABLED(CONFIG_RANDOM_TRUST_CPU);
+static bool trust_bootloader __initdata = IS_ENABLED(CONFIG_RANDOM_TRUST_BOOTLOADER);
+static int __init parse_trust_cpu(char *arg)
+{
+ return kstrtobool(arg, &trust_cpu);
+}
+static int __init parse_trust_bootloader(char *arg)
+{
+ return kstrtobool(arg, &trust_bootloader);
+}
+early_param("random.trust_cpu", parse_trust_cpu);
+early_param("random.trust_bootloader", parse_trust_bootloader);
+
+/*
+ * The first collection of entropy occurs at system boot while interrupts
+ * are still turned off. Here we push in latent entropy, RDSEED, a timestamp,
+ * utsname(), and the command line. Depending on the above configuration knob,
+ * RDSEED may be considered sufficient for initialization. Note that much
+ * earlier setup may already have pushed entropy into the input pool by the
+ * time we get here.
+ */
+int __init random_init(const char *command_line)
+{
+ ktime_t now = ktime_get_real();
+ unsigned int i, arch_bits;
+ unsigned long entropy;
+
+#if defined(LATENT_ENTROPY_PLUGIN)
+ static const u8 compiletime_seed[BLAKE2S_BLOCK_SIZE] __initconst __latent_entropy;
+ _mix_pool_bytes(compiletime_seed, sizeof(compiletime_seed));
+#endif
+
+ for (i = 0, arch_bits = BLAKE2S_BLOCK_SIZE * 8;
+ i < BLAKE2S_BLOCK_SIZE; i += sizeof(entropy)) {
+ if (!arch_get_random_seed_long_early(&entropy) &&
+ !arch_get_random_long_early(&entropy)) {
+ entropy = random_get_entropy();
+ arch_bits -= sizeof(entropy) * 8;
+ }
+ _mix_pool_bytes(&entropy, sizeof(entropy));
+ }
+ _mix_pool_bytes(&now, sizeof(now));
+ _mix_pool_bytes(utsname(), sizeof(*(utsname())));
+ _mix_pool_bytes(command_line, strlen(command_line));
+ add_latent_entropy();
+
+ if (crng_ready())
+ crng_reseed();
+ else if (trust_cpu)
+ _credit_init_bits(arch_bits);
+
+ return 0;
+}
+
+/*
+ * Add device- or boot-specific data to the input pool to help
+ * initialize it.
+ *
+ * None of this adds any entropy; it is meant to avoid the problem of
+ * the entropy pool having similar initial state across largely
+ * identical devices.
+ */
+void add_device_randomness(const void *buf, size_t len)
+{
+ unsigned long entropy = random_get_entropy();
+ unsigned long flags;
+
+ spin_lock_irqsave(&input_pool.lock, flags);
+ _mix_pool_bytes(&entropy, sizeof(entropy));
+ _mix_pool_bytes(buf, len);
+ spin_unlock_irqrestore(&input_pool.lock, flags);
+}
+EXPORT_SYMBOL(add_device_randomness);
+
+/*
+ * Interface for in-kernel drivers of true hardware RNGs.
+ * Those devices may produce endless random bits and will be throttled
+ * when our pool is full.
+ */
+void add_hwgenerator_randomness(const void *buf, size_t len, size_t entropy)
+{
+ mix_pool_bytes(buf, len);
+ credit_init_bits(entropy);
+
+ /*
+ * Throttle writing to once every CRNG_RESEED_INTERVAL, unless
+ * we're not yet initialized.
+ */
+ if (!kthread_should_stop() && crng_ready())
+ schedule_timeout_interruptible(CRNG_RESEED_INTERVAL);
+}
+EXPORT_SYMBOL_GPL(add_hwgenerator_randomness);
+
+/*
+ * Handle random seed passed by bootloader, and credit it if
+ * CONFIG_RANDOM_TRUST_BOOTLOADER is set.
+ */
+void __init add_bootloader_randomness(const void *buf, size_t len)
+{
+ mix_pool_bytes(buf, len);
+ if (trust_bootloader)
+ credit_init_bits(len * 8);
+}
+
+struct fast_pool {
+ unsigned long pool[4];
+ unsigned long last;
+ unsigned int count;
+ struct timer_list mix;
+};
+
+static void mix_interrupt_randomness(struct timer_list *work);
+
+static DEFINE_PER_CPU(struct fast_pool, irq_randomness) = {
+#ifdef CONFIG_64BIT
+#define FASTMIX_PERM SIPHASH_PERMUTATION
+ .pool = { SIPHASH_CONST_0, SIPHASH_CONST_1, SIPHASH_CONST_2, SIPHASH_CONST_3 },
+#else
+#define FASTMIX_PERM HSIPHASH_PERMUTATION
+ .pool = { HSIPHASH_CONST_0, HSIPHASH_CONST_1, HSIPHASH_CONST_2, HSIPHASH_CONST_3 },
+#endif
+ .mix = __TIMER_INITIALIZER(mix_interrupt_randomness, 0)
+};
+
+/*
+ * This is [Half]SipHash-1-x, starting from an empty key. Because
+ * the key is fixed, it assumes that its inputs are non-malicious,
+ * and therefore this has no security on its own. s represents the
+ * four-word SipHash state, while v represents a two-word input.
+ */
+static void fast_mix(unsigned long s[4], unsigned long v1, unsigned long v2)
+{
+ s[3] ^= v1;
+ FASTMIX_PERM(s[0], s[1], s[2], s[3]);
+ s[0] ^= v1;
+ s[3] ^= v2;
+ FASTMIX_PERM(s[0], s[1], s[2], s[3]);
+ s[0] ^= v2;
+}
+
+#ifdef CONFIG_SMP
+/*
+ * This function is called when the CPU has just come online, with
+ * entry CPUHP_AP_RANDOM_ONLINE, just after CPUHP_AP_WORKQUEUE_ONLINE.
+ */
+int __cold random_online_cpu(unsigned int cpu)
+{
+ /*
+ * During CPU shutdown and before CPU onlining, add_interrupt_
+ * randomness() may schedule mix_interrupt_randomness(), and
+ * set the MIX_INFLIGHT flag. However, because the worker can
+ * be scheduled on a different CPU during this period, that
+ * flag will never be cleared. For that reason, we zero out
+ * the flag here, which runs just after workqueues are onlined
+ * for the CPU again. This also has the effect of setting the
+ * irq randomness count to zero so that new accumulated irqs
+ * are fresh.
+ */
+ per_cpu_ptr(&irq_randomness, cpu)->count = 0;
+ return 0;
+}
+#endif
+
+static void mix_interrupt_randomness(struct timer_list *work)
+{
+ struct fast_pool *fast_pool = container_of(work, struct fast_pool, mix);
+ /*
+ * The size of the copied stack pool is explicitly 2 longs so that we
+ * only ever ingest half of the siphash output each time, retaining
+ * the other half as the next "key" that carries over. The entropy is
+ * supposed to be sufficiently dispersed between bits so on average
+ * we don't wind up "losing" some.
+ */
+ unsigned long pool[2];
+ unsigned int count;
+
+ /* Check to see if we're running on the wrong CPU due to hotplug. */
+ local_irq_disable();
+ if (fast_pool != this_cpu_ptr(&irq_randomness)) {
+ local_irq_enable();
+ return;
+ }
+
+ /*
+ * Copy the pool to the stack so that the mixer always has a
+ * consistent view, before we reenable irqs again.
+ */
+ memcpy(pool, fast_pool->pool, sizeof(pool));
+ count = fast_pool->count;
+ fast_pool->count = 0;
+ fast_pool->last = jiffies;
+ local_irq_enable();
+
+ mix_pool_bytes(pool, sizeof(pool));
+ credit_init_bits(clamp_t(unsigned int, (count & U16_MAX) / 64, 1, sizeof(pool) * 8));
+
+ memzero_explicit(pool, sizeof(pool));
+}
+
+void add_interrupt_randomness(int irq)
+{
+ enum { MIX_INFLIGHT = 1U << 31 };
+ unsigned long entropy = random_get_entropy();
+ struct fast_pool *fast_pool = this_cpu_ptr(&irq_randomness);
+ struct pt_regs *regs = get_irq_regs();
+ unsigned int new_count;
+
+ fast_mix(fast_pool->pool, entropy,
+ (regs ? instruction_pointer(regs) : _RET_IP_) ^ swab(irq));
+ new_count = ++fast_pool->count;
+
+ if (new_count & MIX_INFLIGHT)
+ return;
+
+ if (new_count < 1024 && !time_is_before_jiffies(fast_pool->last + HZ))
+ return;
+
+ fast_pool->count |= MIX_INFLIGHT;
+ if (!timer_pending(&fast_pool->mix)) {
+ fast_pool->mix.expires = jiffies;
+ add_timer_on(&fast_pool->mix, raw_smp_processor_id());
+ }
+}
+EXPORT_SYMBOL_GPL(add_interrupt_randomness);
+
+/* There is one of these per entropy source */
+struct timer_rand_state {
+ unsigned long last_time;
+ long last_delta, last_delta2;
+};
+
+/*
+ * This function adds entropy to the entropy "pool" by using timing
+ * delays. It uses the timer_rand_state structure to make an estimate
+ * of how many bits of entropy this call has added to the pool. The
+ * value "num" is also added to the pool; it should somehow describe
+ * the type of event that just happened.
+ */
+static void add_timer_randomness(struct timer_rand_state *state, unsigned int num)
+{
+ unsigned long entropy = random_get_entropy(), now = jiffies, flags;
+ long delta, delta2, delta3;
+ unsigned int bits;
+
+ /*
+ * If we're in a hard IRQ, add_interrupt_randomness() will be called
+ * sometime after, so mix into the fast pool.
+ */
+ if (in_irq()) {
+ fast_mix(this_cpu_ptr(&irq_randomness)->pool, entropy, num);
+ } else {
+ spin_lock_irqsave(&input_pool.lock, flags);
+ _mix_pool_bytes(&entropy, sizeof(entropy));
+ _mix_pool_bytes(&num, sizeof(num));
+ spin_unlock_irqrestore(&input_pool.lock, flags);
+ }
+
+ if (crng_ready())
+ return;
+
+ /*
+ * Calculate number of bits of randomness we probably added.
+ * We take into account the first, second and third-order deltas
+ * in order to make our estimate.
+ */
+ delta = now - READ_ONCE(state->last_time);
+ WRITE_ONCE(state->last_time, now);
+
+ delta2 = delta - READ_ONCE(state->last_delta);
+ WRITE_ONCE(state->last_delta, delta);
+
+ delta3 = delta2 - READ_ONCE(state->last_delta2);
+ WRITE_ONCE(state->last_delta2, delta2);
+
+ if (delta < 0)
+ delta = -delta;
+ if (delta2 < 0)
+ delta2 = -delta2;
+ if (delta3 < 0)
+ delta3 = -delta3;
+ if (delta > delta2)
+ delta = delta2;
+ if (delta > delta3)
+ delta = delta3;
+
+ /*
+ * delta is now minimum absolute delta. Round down by 1 bit
+ * on general principles, and limit entropy estimate to 11 bits.
+ */
+ bits = min(fls(delta >> 1), 11);
+
+ /*
+ * As mentioned above, if we're in a hard IRQ, add_interrupt_randomness()
+ * will run after this, which uses a different crediting scheme of 1 bit
+ * per every 64 interrupts. In order to let that function do accounting
+ * close to the one in this function, we credit a full 64/64 bit per bit,
+ * and then subtract one to account for the extra one added.
+ */
+ if (in_irq())
+ this_cpu_ptr(&irq_randomness)->count += max(1u, bits * 64) - 1;
+ else
+ _credit_init_bits(bits);
+}
+
+void add_input_randomness(unsigned int type, unsigned int code, unsigned int value)
+{
+ static unsigned char last_value;
+ static struct timer_rand_state input_timer_state = { INITIAL_JIFFIES };
+
+ /* Ignore autorepeat and the like. */
+ if (value == last_value)
+ return;
+
+ last_value = value;
+ add_timer_randomness(&input_timer_state,
+ (type << 4) ^ code ^ (code >> 4) ^ value);
+}
+EXPORT_SYMBOL_GPL(add_input_randomness);
+
+#ifdef CONFIG_BLOCK
+void add_disk_randomness(struct gendisk *disk)
+{
+ if (!disk || !disk->random)
+ return;
+ /* First major is 1, so we get >= 0x200 here. */
+ add_timer_randomness(disk->random, 0x100 + disk_devt(disk));
+}
+EXPORT_SYMBOL_GPL(add_disk_randomness);
+
+void __cold rand_initialize_disk(struct gendisk *disk)
+{
+ struct timer_rand_state *state;
+
+ /*
+ * If kzalloc returns null, we just won't use that entropy
+ * source.
+ */
+ state = kzalloc(sizeof(struct timer_rand_state), GFP_KERNEL);
+ if (state) {
+ state->last_time = INITIAL_JIFFIES;
+ disk->random = state;
+ }
+}
+#endif
+
+/*
+ * Each time the timer fires, we expect that we got an unpredictable
+ * jump in the cycle counter. Even if the timer is running on another
+ * CPU, the timer activity will be touching the stack of the CPU that is
+ * generating entropy..
+ *
+ * Note that we don't re-arm the timer in the timer itself - we are
+ * happy to be scheduled away, since that just makes the load more
+ * complex, but we do not want the timer to keep ticking unless the
+ * entropy loop is running.
+ *
+ * So the re-arming always happens in the entropy loop itself.
+ */
+static void __cold entropy_timer(struct timer_list *t)
+{
+ credit_init_bits(1);
+}
+
+/*
+ * If we have an actual cycle counter, see if we can
+ * generate enough entropy with timing noise
+ */
+static void __cold try_to_generate_entropy(void)
+{
+ struct {
+ unsigned long entropy;
+ struct timer_list timer;
+ } stack;
+
+ stack.entropy = random_get_entropy();
+
+ /* Slow counter - or none. Don't even bother */
+ if (stack.entropy == random_get_entropy())
+ return;
+
+ timer_setup_on_stack(&stack.timer, entropy_timer, 0);
+ while (!crng_ready() && !signal_pending(current)) {
+ if (!timer_pending(&stack.timer))
+ mod_timer(&stack.timer, jiffies + 1);
+ mix_pool_bytes(&stack.entropy, sizeof(stack.entropy));
+ schedule();
+ stack.entropy = random_get_entropy();
+ }
+
+ del_timer_sync(&stack.timer);
+ destroy_timer_on_stack(&stack.timer);
+ mix_pool_bytes(&stack.entropy, sizeof(stack.entropy));
+}
+
+
+/**********************************************************************
+ *
+ * Userspace reader/writer interfaces.
+ *
+ * getrandom(2) is the primary modern interface into the RNG and should
+ * be used in preference to anything else.
+ *
+ * Reading from /dev/random has the same functionality as calling
+ * getrandom(2) with flags=0. In earlier versions, however, it had
+ * vastly different semantics and should therefore be avoided, to
+ * prevent backwards compatibility issues.
+ *
+ * Reading from /dev/urandom has the same functionality as calling
+ * getrandom(2) with flags=GRND_INSECURE. Because it does not block
+ * waiting for the RNG to be ready, it should not be used.
+ *
+ * Writing to either /dev/random or /dev/urandom adds entropy to
+ * the input pool but does not credit it.
+ *
+ * Polling on /dev/random indicates when the RNG is initialized, on
+ * the read side, and when it wants new entropy, on the write side.
+ *
+ * Both /dev/random and /dev/urandom have the same set of ioctls for
+ * adding entropy, getting the entropy count, zeroing the count, and
+ * reseeding the crng.
+ *
+ **********************************************************************/
+
+SYSCALL_DEFINE3(getrandom, char __user *, ubuf, size_t, len, unsigned int, flags)
+{
+ struct iov_iter iter;
+ struct iovec iov;
+ int ret;
+
+ if (flags & ~(GRND_NONBLOCK | GRND_RANDOM | GRND_INSECURE))
+ return -EINVAL;
+
+ /*
+ * Requesting insecure and blocking randomness at the same time makes
+ * no sense.
+ */
+ if ((flags & (GRND_INSECURE | GRND_RANDOM)) == (GRND_INSECURE | GRND_RANDOM))
+ return -EINVAL;
+
+ if (!crng_ready() && !(flags & GRND_INSECURE)) {
+ if (flags & GRND_NONBLOCK)
+ return -EAGAIN;
+ ret = wait_for_random_bytes();
+ if (unlikely(ret))
+ return ret;
+ }
+
+ ret = import_single_range(READ, ubuf, len, &iov, &iter);
+ if (unlikely(ret))
+ return ret;
+ return get_random_bytes_user(&iter);
+}
+
+static __poll_t random_poll(struct file *file, poll_table *wait)
+{
+ poll_wait(file, &crng_init_wait, wait);
+ return crng_ready() ? EPOLLIN | EPOLLRDNORM : EPOLLOUT | EPOLLWRNORM;
+}
+
+static ssize_t write_pool_user(struct iov_iter *iter)
+{
+ u8 block[BLAKE2S_BLOCK_SIZE];
+ ssize_t ret = 0;
+ size_t copied;
+
+ if (unlikely(!iov_iter_count(iter)))
+ return 0;
+
+ for (;;) {
+ copied = copy_from_iter(block, sizeof(block), iter);
+ ret += copied;
+ mix_pool_bytes(block, copied);
+ if (!iov_iter_count(iter) || copied != sizeof(block))
+ break;
+
+ BUILD_BUG_ON(PAGE_SIZE % sizeof(block) != 0);
+ if (ret % PAGE_SIZE == 0) {
+ if (signal_pending(current))
+ break;
+ cond_resched();
+ }
+ }
+
+ memzero_explicit(block, sizeof(block));
+ return ret ? ret : -EFAULT;
+}
+
+static ssize_t random_write_iter(struct kiocb *kiocb, struct iov_iter *iter)
+{
+ return write_pool_user(iter);
+}
+
+static ssize_t urandom_read_iter(struct kiocb *kiocb, struct iov_iter *iter)
+{
+ static int maxwarn = 10;
+
+ if (!crng_ready()) {
+ if (!ratelimit_disable && maxwarn <= 0)
+ ++urandom_warning.missed;
+ else if (ratelimit_disable || __ratelimit(&urandom_warning)) {
+ --maxwarn;
+ pr_notice("%s: uninitialized urandom read (%zu bytes read)\n",
+ current->comm, iov_iter_count(iter));
+ }
+ }
+
+ return get_random_bytes_user(iter);
+}
+
+static ssize_t random_read_iter(struct kiocb *kiocb, struct iov_iter *iter)
+{
+ int ret;
+
+ if (!crng_ready() &&
+ ((kiocb->ki_flags & IOCB_NOWAIT) ||
+ (kiocb->ki_filp->f_flags & O_NONBLOCK)))
+ return -EAGAIN;
+
+ ret = wait_for_random_bytes();
+ if (ret != 0)
+ return ret;
+ return get_random_bytes_user(iter);
+}
+
+static long random_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
+{
+ int __user *p = (int __user *)arg;
+ int ent_count;
+
+ switch (cmd) {
+ case RNDGETENTCNT:
+ /* Inherently racy, no point locking. */
+ if (put_user(input_pool.init_bits, p))
+ return -EFAULT;
+ return 0;
+ case RNDADDTOENTCNT:
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ if (get_user(ent_count, p))
+ return -EFAULT;
+ if (ent_count < 0)
+ return -EINVAL;
+ credit_init_bits(ent_count);
+ return 0;
+ case RNDADDENTROPY: {
+ struct iov_iter iter;
+ struct iovec iov;
+ ssize_t ret;
+ int len;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ if (get_user(ent_count, p++))
+ return -EFAULT;
+ if (ent_count < 0)
+ return -EINVAL;
+ if (get_user(len, p++))
+ return -EFAULT;
+ ret = import_single_range(WRITE, p, len, &iov, &iter);
+ if (unlikely(ret))
+ return ret;
+ ret = write_pool_user(&iter);
+ if (unlikely(ret < 0))
+ return ret;
+ /* Since we're crediting, enforce that it was all written into the pool. */
+ if (unlikely(ret != len))
+ return -EFAULT;
+ credit_init_bits(ent_count);
+ return 0;
+ }
+ case RNDZAPENTCNT:
+ case RNDCLEARPOOL:
+ /* No longer has any effect. */
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ return 0;
+ case RNDRESEEDCRNG:
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ if (!crng_ready())
+ return -ENODATA;
+ crng_reseed();
+ return 0;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int random_fasync(int fd, struct file *filp, int on)
+{
+ return fasync_helper(fd, filp, on, &fasync);
+}
+
+const struct file_operations random_fops = {
+ .read_iter = random_read_iter,
+ .write_iter = random_write_iter,
+ .poll = random_poll,
+ .unlocked_ioctl = random_ioctl,
+ .compat_ioctl = compat_ptr_ioctl,
+ .fasync = random_fasync,
+ .llseek = noop_llseek,
+ .splice_read = generic_file_splice_read,
+ .splice_write = iter_file_splice_write,
+};
+
+const struct file_operations urandom_fops = {
+ .read_iter = urandom_read_iter,
+ .write_iter = random_write_iter,
+ .unlocked_ioctl = random_ioctl,
+ .compat_ioctl = compat_ptr_ioctl,
+ .fasync = random_fasync,
+ .llseek = noop_llseek,
+ .splice_read = generic_file_splice_read,
+ .splice_write = iter_file_splice_write,
+};
+
+
+/********************************************************************
+ *
+ * Sysctl interface.
+ *
+ * These are partly unused legacy knobs with dummy values to not break
+ * userspace and partly still useful things. They are usually accessible
+ * in /proc/sys/kernel/random/ and are as follows:
+ *
+ * - boot_id - a UUID representing the current boot.
+ *
+ * - uuid - a random UUID, different each time the file is read.
+ *
+ * - poolsize - the number of bits of entropy that the input pool can
+ * hold, tied to the POOL_BITS constant.
+ *
+ * - entropy_avail - the number of bits of entropy currently in the
+ * input pool. Always <= poolsize.
+ *
+ * - write_wakeup_threshold - the amount of entropy in the input pool
+ * below which write polls to /dev/random will unblock, requesting
+ * more entropy, tied to the POOL_READY_BITS constant. It is writable
+ * to avoid breaking old userspaces, but writing to it does not
+ * change any behavior of the RNG.
+ *
+ * - urandom_min_reseed_secs - fixed to the value CRNG_RESEED_INTERVAL.
+ * It is writable to avoid breaking old userspaces, but writing
+ * to it does not change any behavior of the RNG.
+ *
+ ********************************************************************/
+
+#ifdef CONFIG_SYSCTL
+
+#include <linux/sysctl.h>
+
+static int sysctl_random_min_urandom_seed = CRNG_RESEED_INTERVAL / HZ;
+static int sysctl_random_write_wakeup_bits = POOL_READY_BITS;
+static int sysctl_poolsize = POOL_BITS;
+static u8 sysctl_bootid[UUID_SIZE];
+
+/*
+ * This function is used to return both the bootid UUID, and random
+ * UUID. The difference is in whether table->data is NULL; if it is,
+ * then a new UUID is generated and returned to the user.
+ */
+static int proc_do_uuid(struct ctl_table *table, int write, void __user *buf,
+ size_t *lenp, loff_t *ppos)
+{
+ u8 tmp_uuid[UUID_SIZE], *uuid;
+ char uuid_string[UUID_STRING_LEN + 1];
+ struct ctl_table fake_table = {
+ .data = uuid_string,
+ .maxlen = UUID_STRING_LEN
+ };
+
+ if (write)
+ return -EPERM;
+
+ uuid = table->data;
+ if (!uuid) {
+ uuid = tmp_uuid;
+ generate_random_uuid(uuid);
+ } else {
+ static DEFINE_SPINLOCK(bootid_spinlock);
+
+ spin_lock(&bootid_spinlock);
+ if (!uuid[8])
+ generate_random_uuid(uuid);
+ spin_unlock(&bootid_spinlock);
+ }
+
+ snprintf(uuid_string, sizeof(uuid_string), "%pU", uuid);
+ return proc_dostring(&fake_table, 0, buf, lenp, ppos);
+}
+
+/* The same as proc_dointvec, but writes don't change anything. */
+static int proc_do_rointvec(struct ctl_table *table, int write, void __user *buf,
+ size_t *lenp, loff_t *ppos)
+{
+ return write ? 0 : proc_dointvec(table, 0, buf, lenp, ppos);
+}
+
+extern struct ctl_table random_table[];
+struct ctl_table random_table[] = {
+ {
+ .procname = "poolsize",
+ .data = &sysctl_poolsize,
+ .maxlen = sizeof(int),
+ .mode = 0444,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "entropy_avail",
+ .data = &input_pool.init_bits,
+ .maxlen = sizeof(int),
+ .mode = 0444,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "write_wakeup_threshold",
+ .data = &sysctl_random_write_wakeup_bits,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_do_rointvec,
+ },
+ {
+ .procname = "urandom_min_reseed_secs",
+ .data = &sysctl_random_min_urandom_seed,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_do_rointvec,
+ },
+ {
+ .procname = "boot_id",
+ .data = &sysctl_bootid,
+ .mode = 0444,
+ .proc_handler = proc_do_uuid,
+ },
+ {
+ .procname = "uuid",
+ .mode = 0444,
+ .proc_handler = proc_do_uuid,
+ },
+ { }
+};
+#endif /* CONFIG_SYSCTL */