*
* There are a few exported interfaces for use by other drivers:
*
- * void get_random_bytes(void *buf, size_t nbytes)
+ * void get_random_bytes(void *buf, size_t len)
* u32 get_random_u32()
* u64 get_random_u64()
* unsigned int get_random_int()
};
/* 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 nbytes);
+static void extract_entropy(void *buf, size_t len);
/* This extracts a new crng key from the input pool. */
static void crng_reseed(void)
local_unlock_irqrestore(&crngs.lock, flags);
}
-static void _get_random_bytes(void *buf, size_t nbytes)
+static void _get_random_bytes(void *buf, size_t len)
{
u32 chacha_state[CHACHA_STATE_WORDS];
u8 tmp[CHACHA_BLOCK_SIZE];
- size_t len;
+ size_t first_block_len;
- if (!nbytes)
+ if (!len)
return;
- len = min_t(size_t, 32, nbytes);
- crng_make_state(chacha_state, buf, len);
- nbytes -= len;
- buf += len;
+ 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 (nbytes) {
- if (nbytes < CHACHA_BLOCK_SIZE) {
+ while (len) {
+ if (len < CHACHA_BLOCK_SIZE) {
chacha20_block(chacha_state, tmp);
- memcpy(buf, tmp, nbytes);
+ memcpy(buf, tmp, len);
memzero_explicit(tmp, sizeof(tmp));
break;
}
chacha20_block(chacha_state, buf);
if (unlikely(chacha_state[12] == 0))
++chacha_state[13];
- nbytes -= CHACHA_BLOCK_SIZE;
+ len -= CHACHA_BLOCK_SIZE;
buf += CHACHA_BLOCK_SIZE;
}
* 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 nbytes)
+void get_random_bytes(void *buf, size_t len)
{
warn_unseeded_randomness();
- _get_random_bytes(buf, nbytes);
+ _get_random_bytes(buf, len);
}
EXPORT_SYMBOL(get_random_bytes);
-static ssize_t get_random_bytes_user(void __user *buf, size_t nbytes)
+static ssize_t get_random_bytes_user(void __user *ubuf, size_t len)
{
- size_t len, left, ret = 0;
+ size_t block_len, left, ret = 0;
u32 chacha_state[CHACHA_STATE_WORDS];
u8 output[CHACHA_BLOCK_SIZE];
- if (!nbytes)
+ if (!len)
return 0;
/*
* use chacha_state after, so we can simply return those bytes to
* the user directly.
*/
- if (nbytes <= CHACHA_KEY_SIZE) {
- ret = nbytes - copy_to_user(buf, &chacha_state[4], nbytes);
+ if (len <= CHACHA_KEY_SIZE) {
+ ret = len - copy_to_user(ubuf, &chacha_state[4], len);
goto out_zero_chacha;
}
if (unlikely(chacha_state[12] == 0))
++chacha_state[13];
- len = min_t(size_t, nbytes, CHACHA_BLOCK_SIZE);
- left = copy_to_user(buf, output, len);
+ block_len = min_t(size_t, len, CHACHA_BLOCK_SIZE);
+ left = copy_to_user(ubuf, output, block_len);
if (left) {
- ret += len - left;
+ ret += block_len - left;
break;
}
- buf += len;
- ret += len;
- nbytes -= len;
- if (!nbytes)
+ ubuf += block_len;
+ ret += block_len;
+ len -= block_len;
+ if (!len)
break;
BUILD_BUG_ON(PAGE_SIZE % CHACHA_BLOCK_SIZE != 0);
* 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 nbytes)
+size_t __must_check get_random_bytes_arch(void *buf, size_t len)
{
- size_t left = nbytes;
+ size_t left = len;
u8 *p = buf;
while (left) {
unsigned long v;
- size_t chunk = min_t(size_t, left, sizeof(unsigned long));
+ size_t block_len = min_t(size_t, left, sizeof(unsigned long));
if (!arch_get_random_long(&v))
break;
- memcpy(p, &v, chunk);
- p += chunk;
- left -= chunk;
+ memcpy(p, &v, block_len);
+ p += block_len;
+ left -= block_len;
}
- return nbytes - left;
+ return len - left;
}
EXPORT_SYMBOL(get_random_bytes_arch);
*
* Callers may add entropy via:
*
- * static void mix_pool_bytes(const void *in, size_t nbytes)
+ * 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 nbits)
+ * static void credit_init_bits(size_t bits)
*
* Finally, extract entropy via:
*
- * static void extract_entropy(void *buf, size_t nbytes)
+ * static void extract_entropy(void *buf, size_t len)
*
**********************************************************************/
.lock = __SPIN_LOCK_UNLOCKED(input_pool.lock),
};
-static void _mix_pool_bytes(const void *in, size_t nbytes)
+static void _mix_pool_bytes(const void *buf, size_t len)
{
- blake2s_update(&input_pool.hash, in, nbytes);
+ blake2s_update(&input_pool.hash, buf, len);
}
/*
* update the initialization bit counter; the caller should call
* credit_init_bits if this is appropriate.
*/
-static void mix_pool_bytes(const void *in, size_t nbytes)
+static void mix_pool_bytes(const void *buf, size_t len)
{
unsigned long flags;
spin_lock_irqsave(&input_pool.lock, flags);
- _mix_pool_bytes(in, nbytes);
+ _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 nbytes)
+static void extract_entropy(void *buf, size_t len)
{
unsigned long flags;
u8 seed[BLAKE2S_HASH_SIZE], next_key[BLAKE2S_HASH_SIZE];
spin_unlock_irqrestore(&input_pool.lock, flags);
memzero_explicit(next_key, sizeof(next_key));
- while (nbytes) {
- i = min_t(size_t, nbytes, BLAKE2S_HASH_SIZE);
+ 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));
- nbytes -= i;
+ len -= i;
buf += i;
}
memzero_explicit(&block, sizeof(block));
}
-static void credit_init_bits(size_t nbits)
+static void credit_init_bits(size_t bits)
{
static struct execute_work set_ready;
unsigned int new, orig, add;
unsigned long flags;
- if (crng_ready() || !nbits)
+ if (crng_ready() || !bits)
return;
- add = min_t(size_t, nbits, POOL_BITS);
+ add = min_t(size_t, bits, POOL_BITS);
do {
orig = READ_ONCE(input_pool.init_bits);
* The following exported functions are used for pushing entropy into
* the above entropy accumulation routines:
*
- * void add_device_randomness(const void *buf, size_t size);
- * void add_hwgenerator_randomness(const void *buffer, size_t count,
- * size_t entropy);
- * void add_bootloader_randomness(const void *buf, size_t size);
+ * 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_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
{
ktime_t now = ktime_get_real();
unsigned int i, arch_bytes;
- unsigned long rv;
+ unsigned long entropy;
#if defined(LATENT_ENTROPY_PLUGIN)
static const u8 compiletime_seed[BLAKE2S_BLOCK_SIZE] __initconst __latent_entropy;
#endif
for (i = 0, arch_bytes = BLAKE2S_BLOCK_SIZE;
- i < BLAKE2S_BLOCK_SIZE; i += sizeof(rv)) {
- if (!arch_get_random_seed_long_early(&rv) &&
- !arch_get_random_long_early(&rv)) {
- rv = random_get_entropy();
- arch_bytes -= sizeof(rv);
+ 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_bytes -= sizeof(entropy);
}
- _mix_pool_bytes(&rv, sizeof(rv));
+ _mix_pool_bytes(&entropy, sizeof(entropy));
}
_mix_pool_bytes(&now, sizeof(now));
_mix_pool_bytes(utsname(), sizeof(*(utsname())));
* the entropy pool having similar initial state across largely
* identical devices.
*/
-void add_device_randomness(const void *buf, size_t size)
+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, size);
+ _mix_pool_bytes(buf, len);
spin_unlock_irqrestore(&input_pool.lock, flags);
}
EXPORT_SYMBOL(add_device_randomness);
* Those devices may produce endless random bits and will be throttled
* when our pool is full.
*/
-void add_hwgenerator_randomness(const void *buffer, size_t count,
- size_t entropy)
+void add_hwgenerator_randomness(const void *buf, size_t len, size_t entropy)
{
- mix_pool_bytes(buffer, count);
+ mix_pool_bytes(buf, len);
credit_init_bits(entropy);
/*
* Handle random seed passed by bootloader, and credit it if
* CONFIG_RANDOM_TRUST_BOOTLOADER is set.
*/
-void add_bootloader_randomness(const void *buf, size_t size)
+void add_bootloader_randomness(const void *buf, size_t len)
{
- mix_pool_bytes(buf, size);
+ mix_pool_bytes(buf, len);
if (trust_bootloader)
- credit_init_bits(size * 8);
+ credit_init_bits(len * 8);
}
EXPORT_SYMBOL_GPL(add_bootloader_randomness);
credit_init_bits(bits);
}
-void add_input_randomness(unsigned int type, unsigned int code,
- unsigned int value)
+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 };
*
**********************************************************************/
-SYSCALL_DEFINE3(getrandom, char __user *, buf, size_t, count, unsigned int,
- flags)
+SYSCALL_DEFINE3(getrandom, char __user *, ubuf, size_t, len, unsigned int, flags)
{
if (flags & ~(GRND_NONBLOCK | GRND_RANDOM | GRND_INSECURE))
return -EINVAL;
if ((flags & (GRND_INSECURE | GRND_RANDOM)) == (GRND_INSECURE | GRND_RANDOM))
return -EINVAL;
- if (count > INT_MAX)
- count = INT_MAX;
+ if (len > INT_MAX)
+ len = INT_MAX;
if (!crng_ready() && !(flags & GRND_INSECURE)) {
int ret;
if (unlikely(ret))
return ret;
}
- return get_random_bytes_user(buf, count);
+ return get_random_bytes_user(ubuf, len);
}
static __poll_t random_poll(struct file *file, poll_table *wait)
return crng_ready() ? EPOLLIN | EPOLLRDNORM : EPOLLOUT | EPOLLWRNORM;
}
-static int write_pool(const char __user *ubuf, size_t count)
+static int write_pool(const char __user *ubuf, size_t len)
{
- size_t len;
+ size_t block_len;
int ret = 0;
u8 block[BLAKE2S_BLOCK_SIZE];
- while (count) {
- len = min(count, sizeof(block));
- if (copy_from_user(block, ubuf, len)) {
+ while (len) {
+ block_len = min(len, sizeof(block));
+ if (copy_from_user(block, ubuf, block_len)) {
ret = -EFAULT;
goto out;
}
- count -= len;
- ubuf += len;
- mix_pool_bytes(block, len);
+ len -= block_len;
+ ubuf += block_len;
+ mix_pool_bytes(block, block_len);
cond_resched();
}
return ret;
}
-static ssize_t random_write(struct file *file, const char __user *buffer,
- size_t count, loff_t *ppos)
+static ssize_t random_write(struct file *file, const char __user *ubuf,
+ size_t len, loff_t *ppos)
{
int ret;
- ret = write_pool(buffer, count);
+ ret = write_pool(ubuf, len);
if (ret)
return ret;
- return (ssize_t)count;
+ return (ssize_t)len;
}
-static ssize_t urandom_read(struct file *file, char __user *buf, size_t nbytes,
- loff_t *ppos)
+static ssize_t urandom_read(struct file *file, char __user *ubuf,
+ size_t len, loff_t *ppos)
{
static int maxwarn = 10;
else if (ratelimit_disable || __ratelimit(&urandom_warning)) {
--maxwarn;
pr_notice("%s: uninitialized urandom read (%zd bytes read)\n",
- current->comm, nbytes);
+ current->comm, len);
}
}
- return get_random_bytes_user(buf, nbytes);
+ return get_random_bytes_user(ubuf, len);
}
-static ssize_t random_read(struct file *file, char __user *buf, size_t nbytes,
- loff_t *ppos)
+static ssize_t random_read(struct file *file, char __user *ubuf,
+ size_t len, loff_t *ppos)
{
int ret;
ret = wait_for_random_bytes();
if (ret != 0)
return ret;
- return get_random_bytes_user(buf, nbytes);
+ return get_random_bytes_user(ubuf, len);
}
static long random_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
* 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 *buffer,
+static int proc_do_uuid(struct ctl_table *table, int write, void *buf,
size_t *lenp, loff_t *ppos)
{
u8 tmp_uuid[UUID_SIZE], *uuid;
}
snprintf(uuid_string, sizeof(uuid_string), "%pU", uuid);
- return proc_dostring(&fake_table, 0, buffer, lenp, ppos);
+ 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 *buffer,
+static int proc_do_rointvec(struct ctl_table *table, int write, void *buf,
size_t *lenp, loff_t *ppos)
{
- return write ? 0 : proc_dointvec(table, 0, buffer, lenp, ppos);
+ return write ? 0 : proc_dointvec(table, 0, buf, lenp, ppos);
}
extern struct ctl_table random_table[];
projects / platform / kernel / linux-rpi.git / commitdiff