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don't allow /dev/random to be opened (return ENXIO) until there is at least

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one active entropy source
This commit is contained in:
explorer 1999-04-01 19:07:40 +00:00
parent 96139333c2
commit 3f80ba486e
1 changed files with 26 additions and 8 deletions
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34
sys/dev/rnd.c
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@ -1,4 +1,4 @@
/* $NetBSD: rnd.c,v 1.14 1999/02/28 19:01:30 explorer Exp $ */ /* $NetBSD: rnd.c,v 1.15 1999/04/01 19:07:40 explorer Exp $ */
/*- /*-
* Copyright (c) 1997 The NetBSD Foundation, Inc. * Copyright (c) 1997 The NetBSD Foundation, Inc.
@ -149,6 +149,11 @@ static inline u_int32_t rnd_estimate_entropy(rndsource_t *, u_int32_t);
static inline u_int32_t rnd_timestamp(void); static inline u_int32_t rnd_timestamp(void);
static void rnd_timeout(void *); static void rnd_timeout(void *);
static int rnd_ready = 0;
static int rnd_have_entropy = 0;
LIST_HEAD(, __rndsource_element) rnd_sources;
/* /*
* Generate a 32-bit timestamp. This should be more machine dependant, * Generate a 32-bit timestamp. This should be more machine dependant,
* using cycle counters and the like when possible. * using cycle counters and the like when possible.
@ -184,6 +189,11 @@ rnd_wakeup_readers()
wakeup(&rnd_selq); wakeup(&rnd_selq);
} }
selwakeup(&rnd_selq); selwakeup(&rnd_selq);
/*
* Allow open of /dev/random now, too.
*/
rnd_have_entropy = 1;
} }
} }
@ -238,10 +248,6 @@ rnd_estimate_entropy(rs, t)
return 1; return 1;
} }
static int rnd_ready;
LIST_HEAD(, __rndsource_element) rnd_sources;
/* /*
* attach the random device, and initialize the global random pool * attach the random device, and initialize the global random pool
* for our use. * for our use.
@ -286,8 +292,20 @@ rndopen(dev, flags, ifmt, p)
if (rnd_ready == 0) if (rnd_ready == 0)
return (ENXIO); return (ENXIO);
if (minor(dev) == RND_DEV_RANDOM || minor(dev) == RND_DEV_URANDOM) if (minor(dev) == RND_DEV_URANDOM)
return 0; return (0);
/*
* If this is the strong random device and we have never collected
* entropy (or have not yet) don't allow it to be opened. This will
* prevent waiting forever for something that just will not appear.
*/
if (minor(dev) == RND_DEV_RANDOM) {
if (rnd_have_entropy == 0)
return (ENXIO);
else
return (0);
}
return (ENXIO); return (ENXIO);
} }
@ -666,7 +684,7 @@ rnd_sample_allocate(rndsource_t *source)
} }
/* /*
* don't want on allocation. to be used in an interrupt context. * don't wait on allocation. to be used in an interrupt context.
*/ */
static rnd_sample_t * static rnd_sample_t *
rnd_sample_allocate_isr(rndsource_t *source) rnd_sample_allocate_isr(rndsource_t *source)