On Thursday, January 26, 2012 10:56:27 am Andrey Chernov wrote:
> > On Thu, Jan 26, 2012 at 08:39:07AM -0500, John Baldwin wrote:
> > > atomic_cmpset_int(&iniseed_state, ARC4_ENTER_NONE,
ARC4_ENTER_HAVE);
> > > break;
>
> Updated version (I hope, final):
>
> --- sys/libkern.h.old 2012-01-16 07:15:12.000000000 +0400
> +++ sys/libkern.h 2012-01-26 19:38:06.000000000 +0400
> @@ -72,6 +72,8 @@ static __inline quad_t qabs(quad_t a) {
>
> /* Prototypes for non-quad routines. */
> struct malloc_type;
> +enum arc4_is { ARC4_ENTR_NONE, ARC4_ENTR_HAVE, ARC4_ENTR_DONE };
> +extern volatile enum arc4_is arc4rand_iniseed_state;
Atomics don't operate on enums. You'll need to make it an int and just use
#define's for the 3 states.
> uint32_t arc4random(void);
> void arc4rand(void *ptr, u_int len, int reseed);
> int bcmp(const void *, const void *, size_t);
> --- dev/random/randomdev_soft.c.old 2011-03-02 01:42:19.000000000 +0300
> +++ dev/random/randomdev_soft.c 2012-01-26 19:35:12.000000000 +0400
> @@ -366,6 +366,8 @@ random_yarrow_unblock(void)
> selwakeuppri(&random_systat.rsel, PUSER);
> wakeup(&random_systat);
> }
> + (void)atomic_cmpset_int(&arc4rand_iniseed_state,
> + ARC4_ENTR_NONE, ARC4_ENTR_HAVE);
> }
>
> static int
> --- libkern/arc4random.c.old 2008-08-08 01:51:09.000000000 +0400
> +++ libkern/arc4random.c 2012-01-26 19:43:31.000000000 +0400
> @@ -24,6 +24,7 @@ __FBSDID("$FreeBSD: src/sys/libkern/arc4
> #define ARC4_RESEED_SECONDS 300
> #define ARC4_KEYBYTES (256 / 8)
>
> +volatile enum arc4_is arc4rand_iniseed_state = ARC4_ENTR_NONE;
> static u_int8_t arc4_i, arc4_j;
> static int arc4_numruns = 0;
> static u_int8_t arc4_sbox[256];
> @@ -130,7 +131,9 @@ arc4rand(void *ptr, u_int len, int resee
> struct timeval tv;
>
> getmicrouptime(&tv);
> - if (reseed ||
> + if (atomic_cmpset_int(&arc4rand_iniseed_state,
> + ARC4_ENTR_HAVE, ARC4_ENTR_DONE) ||
> + reseed ||
> (arc4_numruns > ARC4_RESEED_BYTES) ||
> (tv.tv_sec > arc4_t_reseed))
> arc4_randomstir();
I think the rest of this is fine.
--
John Baldwin
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