Differential D19948 Diff 56322 sys/dev/random/randomdev.c

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sys/dev/random/randomdev.c

Show First 20 Lines • Show All 251 Lines • ▼ Show 20 Lines	READ_RANDOM(void *random_buf, u_int len)
u_int read_directly_len;		u_int read_directly_len;

KASSERT(random_buf != NULL, ("No suitable random buffer in %s", __func__));		KASSERT(random_buf != NULL, ("No suitable random buffer in %s", __func__));
p_random_alg_context->ra_pre_read();		p_random_alg_context->ra_pre_read();

if (len == 0)		if (len == 0)
return;		return;

		#ifdef INVARIANTS
		if ((curthread->td_pflags & TDP_RNG_SEEDED) == 0)
		WITNESS_WARN(WARN_GIANTOK \| WARN_SLEEPOK, NULL,
		"read_random may block once");
		#endif

/* (Un)Blocking logic */		/* (Un)Blocking logic */
if (__predict_false(!p_random_alg_context->ra_seeded())) {		if (__predict_false(!p_random_alg_context->ra_seeded())) {
if (random_bypass_before_seeding) {		if (random_bypass_before_seeding) {
if (!read_random_bypassed_before_seeding) {		if (!read_random_bypassed_before_seeding) {
if (!random_bypass_disable_warnings)		if (!random_bypass_disable_warnings)
printf("read_random: WARNING: bypassing"		printf("read_random: WARNING: bypassing"
" request for random data because "		" request for random data because "
"the random device is not yet "		"the random device is not yet "
Show All 27 Lines	if (read_directly_len < len) {

explicit_bzero(remainder_buf, sizeof(remainder_buf));		explicit_bzero(remainder_buf, sizeof(remainder_buf));
}		}
}		}

bool		bool
IS_RANDOM_SEEDED(void)		IS_RANDOM_SEEDED(void)
{		{
return (p_random_alg_context->ra_seeded());		bool seeded;

		seeded = p_random_alg_context->ra_seeded();
		#ifdef INVARIANTS
		/*
		* Mute false-positive WITNESS_WARNs for threads that have already
		* confirmed seeded status.
		*/
		if (seeded)
		curthread->td_pflags \|= TDP_RNG_SEEDED;
		#endif
		return (seeded);
}		}

static __inline void		static __inline void
randomdev_accumulate(uint8_t *buf, u_int count)		randomdev_accumulate(uint8_t *buf, u_int count)
{		{
static u_int destination = 0;		static u_int destination = 0;
static struct harvest_event event;		static struct harvest_event event;
static struct randomdev_hash hash;		static struct randomdev_hash hash;
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