From: "Jason A. Donenfeld" Jason@zx2c4.com
commit d38bb0853589c939573ea50e9cb64f733e0e273d upstream.
Rather than using the userspace type, __uXX, switch to using uXX. And rather than using variously chosen `char *` or `unsigned char *`, use `u8 *` uniformly for things that aren't strings, in the case where we are doing byte-by-byte traversal.
Reviewed-by: Dominik Brodowski linux@dominikbrodowski.net Signed-off-by: Jason A. Donenfeld Jason@zx2c4.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/char/random.c | 114 +++++++++++++++++++++++++------------------------- 1 file changed, 57 insertions(+), 57 deletions(-)
--- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -457,7 +457,7 @@ static DEFINE_SPINLOCK(random_ready_list static LIST_HEAD(random_ready_list);
struct crng_state { - __u32 state[16]; + u32 state[16]; unsigned long init_time; spinlock_t lock; }; @@ -484,10 +484,9 @@ static bool crng_need_final_init = false static int crng_init_cnt = 0; static unsigned long crng_global_init_time = 0; #define CRNG_INIT_CNT_THRESH (2*CHACHA20_KEY_SIZE) -static void _extract_crng(struct crng_state *crng, - __u8 out[CHACHA20_BLOCK_SIZE]); +static void _extract_crng(struct crng_state *crng, u8 out[CHACHA20_BLOCK_SIZE]); static void _crng_backtrack_protect(struct crng_state *crng, - __u8 tmp[CHACHA20_BLOCK_SIZE], int used); + u8 tmp[CHACHA20_BLOCK_SIZE], int used); static void process_random_ready_list(void); static void _get_random_bytes(void *buf, int nbytes);
@@ -511,16 +510,16 @@ MODULE_PARM_DESC(ratelimit_disable, "Dis struct entropy_store; struct entropy_store { /* read-only data: */ - __u32 *pool; + u32 *pool; const char *name;
/* read-write data: */ spinlock_t lock; - unsigned short add_ptr; - unsigned short input_rotate; + u16 add_ptr; + u16 input_rotate; int entropy_count; unsigned int last_data_init:1; - __u8 last_data[EXTRACT_SIZE]; + u8 last_data[EXTRACT_SIZE]; };
static ssize_t extract_entropy(struct entropy_store *r, void *buf, @@ -529,7 +528,7 @@ static ssize_t _extract_entropy(struct e size_t nbytes, int fips);
static void crng_reseed(struct crng_state *crng, struct entropy_store *r); -static __u32 input_pool_data[INPUT_POOL_WORDS] __latent_entropy; +static u32 input_pool_data[INPUT_POOL_WORDS] __latent_entropy;
static struct entropy_store input_pool = { .name = "input", @@ -537,7 +536,7 @@ static struct entropy_store input_pool = .pool = input_pool_data };
-static __u32 const twist_table[8] = { +static u32 const twist_table[8] = { 0x00000000, 0x3b6e20c8, 0x76dc4190, 0x4db26158, 0xedb88320, 0xd6d6a3e8, 0x9b64c2b0, 0xa00ae278 };
@@ -556,8 +555,8 @@ static void _mix_pool_bytes(struct entro { unsigned long i; int input_rotate; - const unsigned char *bytes = in; - __u32 w; + const u8 *bytes = in; + u32 w;
input_rotate = r->input_rotate; i = r->add_ptr; @@ -610,10 +609,10 @@ static void mix_pool_bytes(struct entrop }
struct fast_pool { - __u32 pool[4]; + u32 pool[4]; unsigned long last; - unsigned short reg_idx; - unsigned char count; + u16 reg_idx; + u8 count; };
/* @@ -623,8 +622,8 @@ struct fast_pool { */ static void fast_mix(struct fast_pool *f) { - __u32 a = f->pool[0], b = f->pool[1]; - __u32 c = f->pool[2], d = f->pool[3]; + u32 a = f->pool[0], b = f->pool[1]; + u32 c = f->pool[2], d = f->pool[3];
a += b; c += d; b = rol32(b, 6); d = rol32(d, 27); @@ -815,14 +814,14 @@ static bool __init crng_init_try_arch_ea static void crng_initialize_secondary(struct crng_state *crng) { chacha_init_consts(crng->state); - _get_random_bytes(&crng->state[4], sizeof(__u32) * 12); + _get_random_bytes(&crng->state[4], sizeof(u32) * 12); crng_init_try_arch(crng); crng->init_time = jiffies - CRNG_RESEED_INTERVAL - 1; }
static void __init crng_initialize_primary(struct crng_state *crng) { - _extract_entropy(&input_pool, &crng->state[4], sizeof(__u32) * 12, 0); + _extract_entropy(&input_pool, &crng->state[4], sizeof(u32) * 12, 0); if (crng_init_try_arch_early(crng) && trust_cpu && crng_init < 2) { invalidate_batched_entropy(); numa_crng_init(); @@ -909,12 +908,14 @@ static struct crng_state *select_crng(vo
/* * crng_fast_load() can be called by code in the interrupt service - * path. So we can't afford to dilly-dally. + * path. So we can't afford to dilly-dally. Returns the number of + * bytes processed from cp. */ -static int crng_fast_load(const char *cp, size_t len) +static size_t crng_fast_load(const u8 *cp, size_t len) { unsigned long flags; - char *p; + u8 *p; + size_t ret = 0;
if (!spin_trylock_irqsave(&primary_crng.lock, flags)) return 0; @@ -922,10 +923,10 @@ static int crng_fast_load(const char *cp spin_unlock_irqrestore(&primary_crng.lock, flags); return 0; } - p = (unsigned char *) &primary_crng.state[4]; + p = (u8 *) &primary_crng.state[4]; while (len > 0 && crng_init_cnt < CRNG_INIT_CNT_THRESH) { p[crng_init_cnt % CHACHA20_KEY_SIZE] ^= *cp; - cp++; crng_init_cnt++; len--; + cp++; crng_init_cnt++; len--; ret++; } spin_unlock_irqrestore(&primary_crng.lock, flags); if (crng_init_cnt >= CRNG_INIT_CNT_THRESH) { @@ -933,7 +934,7 @@ static int crng_fast_load(const char *cp crng_init = 1; pr_notice("fast init done\n"); } - return 1; + return ret; }
/* @@ -950,14 +951,14 @@ static int crng_fast_load(const char *cp * like a fixed DMI table (for example), which might very well be * unique to the machine, but is otherwise unvarying. */ -static int crng_slow_load(const char *cp, size_t len) +static int crng_slow_load(const u8 *cp, size_t len) { unsigned long flags; - static unsigned char lfsr = 1; - unsigned char tmp; - unsigned i, max = CHACHA20_KEY_SIZE; - const char * src_buf = cp; - char * dest_buf = (char *) &primary_crng.state[4]; + static u8 lfsr = 1; + u8 tmp; + unsigned int i, max = CHACHA20_KEY_SIZE; + const u8 * src_buf = cp; + u8 * dest_buf = (u8 *) &primary_crng.state[4];
if (!spin_trylock_irqsave(&primary_crng.lock, flags)) return 0; @@ -986,8 +987,8 @@ static void crng_reseed(struct crng_stat unsigned long flags; int i, num; union { - __u8 block[CHACHA20_BLOCK_SIZE]; - __u32 key[8]; + u8 block[CHACHA20_BLOCK_SIZE]; + u32 key[8]; } buf;
if (r) { @@ -1014,7 +1015,7 @@ static void crng_reseed(struct crng_stat }
static void _extract_crng(struct crng_state *crng, - __u8 out[CHACHA20_BLOCK_SIZE]) + u8 out[CHACHA20_BLOCK_SIZE]) { unsigned long flags, init_time;
@@ -1032,7 +1033,7 @@ static void _extract_crng(struct crng_st spin_unlock_irqrestore(&crng->lock, flags); }
-static void extract_crng(__u8 out[CHACHA20_BLOCK_SIZE]) +static void extract_crng(u8 out[CHACHA20_BLOCK_SIZE]) { _extract_crng(select_crng(), out); } @@ -1042,26 +1043,26 @@ static void extract_crng(__u8 out[CHACHA * enough) to mutate the CRNG key to provide backtracking protection. */ static void _crng_backtrack_protect(struct crng_state *crng, - __u8 tmp[CHACHA20_BLOCK_SIZE], int used) + u8 tmp[CHACHA20_BLOCK_SIZE], int used) { unsigned long flags; - __u32 *s, *d; + u32 *s, *d; int i;
- used = round_up(used, sizeof(__u32)); + used = round_up(used, sizeof(u32)); if (used + CHACHA20_KEY_SIZE > CHACHA20_BLOCK_SIZE) { extract_crng(tmp); used = 0; } spin_lock_irqsave(&crng->lock, flags); - s = (__u32 *) &tmp[used]; + s = (u32 *) &tmp[used]; d = &crng->state[4]; for (i=0; i < 8; i++) *d++ ^= *s++; spin_unlock_irqrestore(&crng->lock, flags); }
-static void crng_backtrack_protect(__u8 tmp[CHACHA20_BLOCK_SIZE], int used) +static void crng_backtrack_protect(u8 tmp[CHACHA20_BLOCK_SIZE], int used) { _crng_backtrack_protect(select_crng(), tmp, used); } @@ -1069,7 +1070,7 @@ static void crng_backtrack_protect(__u8 static ssize_t extract_crng_user(void __user *buf, size_t nbytes) { ssize_t ret = 0, i = CHACHA20_BLOCK_SIZE; - __u8 tmp[CHACHA20_BLOCK_SIZE] __aligned(4); + u8 tmp[CHACHA20_BLOCK_SIZE] __aligned(4); int large_request = (nbytes > 256);
while (nbytes) { @@ -1157,8 +1158,8 @@ static void add_timer_randomness(struct struct entropy_store *r; struct { long jiffies; - unsigned cycles; - unsigned num; + unsigned int cycles; + unsigned int num; } sample; long delta, delta2, delta3;
@@ -1240,15 +1241,15 @@ static void add_interrupt_bench(cycles_t #define add_interrupt_bench(x) #endif
-static __u32 get_reg(struct fast_pool *f, struct pt_regs *regs) +static u32 get_reg(struct fast_pool *f, struct pt_regs *regs) { - __u32 *ptr = (__u32 *) regs; + u32 *ptr = (u32 *) regs; unsigned int idx;
if (regs == NULL) return 0; idx = READ_ONCE(f->reg_idx); - if (idx >= sizeof(struct pt_regs) / sizeof(__u32)) + if (idx >= sizeof(struct pt_regs) / sizeof(u32)) idx = 0; ptr += idx++; WRITE_ONCE(f->reg_idx, idx); @@ -1262,8 +1263,8 @@ void add_interrupt_randomness(int irq) struct pt_regs *regs = get_irq_regs(); unsigned long now = jiffies; cycles_t cycles = random_get_entropy(); - __u32 c_high, j_high; - __u64 ip; + u32 c_high, j_high; + u64 ip;
if (cycles == 0) cycles = get_reg(fast_pool, regs); @@ -1281,8 +1282,7 @@ void add_interrupt_randomness(int irq)
if (unlikely(crng_init == 0)) { if ((fast_pool->count >= 64) && - crng_fast_load((char *) fast_pool->pool, - sizeof(fast_pool->pool))) { + crng_fast_load((u8 *)fast_pool->pool, sizeof(fast_pool->pool)) > 0) { fast_pool->count = 0; fast_pool->last = now; } @@ -1379,7 +1379,7 @@ retry: * * Note: we assume that .poolwords is a multiple of 16 words. */ -static void extract_buf(struct entropy_store *r, __u8 *out) +static void extract_buf(struct entropy_store *r, u8 *out) { struct blake2s_state state __aligned(__alignof__(unsigned long)); u8 hash[BLAKE2S_HASH_SIZE]; @@ -1429,7 +1429,7 @@ static ssize_t _extract_entropy(struct e size_t nbytes, int fips) { ssize_t ret = 0, i; - __u8 tmp[EXTRACT_SIZE]; + u8 tmp[EXTRACT_SIZE]; unsigned long flags;
while (nbytes) { @@ -1467,7 +1467,7 @@ static ssize_t _extract_entropy(struct e static ssize_t extract_entropy(struct entropy_store *r, void *buf, size_t nbytes, int min, int reserved) { - __u8 tmp[EXTRACT_SIZE]; + u8 tmp[EXTRACT_SIZE]; unsigned long flags;
/* if last_data isn't primed, we need EXTRACT_SIZE extra bytes */ @@ -1529,7 +1529,7 @@ static void _warn_unseeded_randomness(co */ static void _get_random_bytes(void *buf, int nbytes) { - __u8 tmp[CHACHA20_BLOCK_SIZE] __aligned(4); + u8 tmp[CHACHA20_BLOCK_SIZE] __aligned(4);
trace_get_random_bytes(nbytes, _RET_IP_);
@@ -1663,7 +1663,7 @@ EXPORT_SYMBOL(del_random_ready_callback) int __must_check get_random_bytes_arch(void *buf, int nbytes) { int left = nbytes; - char *p = buf; + u8 *p = buf;
trace_get_random_bytes_arch(left, _RET_IP_); while (left) { @@ -1805,7 +1805,7 @@ static int write_pool(struct entropy_store *r, const char __user *buffer, size_t count) { size_t bytes; - __u32 t, buf[16]; + u32 t, buf[16]; const char __user *p = buffer;
while (count > 0) { @@ -1815,7 +1815,7 @@ write_pool(struct entropy_store *r, cons if (copy_from_user(&buf, p, bytes)) return -EFAULT;
- for (b = bytes ; b > 0 ; b -= sizeof(__u32), i++) { + for (b = bytes; b > 0; b -= sizeof(u32), i++) { if (!arch_get_random_int(&t)) break; buf[i] ^= t;