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Differential D23718 Diff 68417 sys/dev/random/random_harvestq.c

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sys/dev/random/random_harvestq.c

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struct random_sources { struct random_sources {
CK_LIST_ENTRY(random_sources) rrs_entries; CK_LIST_ENTRY(random_sources) rrs_entries;
struct random_source *rrs_source; struct random_source *rrs_source;
}; };
static CK_LIST_HEAD(sources_head, random_sources) source_list = static CK_LIST_HEAD(sources_head, random_sources) source_list =
CK_LIST_HEAD_INITIALIZER(source_list); CK_LIST_HEAD_INITIALIZER(source_list);
SYSCTL_NODE(_kern_random, OID_AUTO, harvest, CTLFLAG_RW, 0, SYSCTL_NODE(_kern_random, OID_AUTO, harvest, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"Entropy Device Parameters"); "Entropy Device Parameters");
/* /*
* Put all the harvest queue context stuff in one place. * Put all the harvest queue context stuff in one place.
* this make is a bit easier to lock and protect. * this make is a bit easier to lock and protect.
*/ */
static struct harvest_context { static struct harvest_context {
/* The harvest mutex protects all of harvest_context and /* The harvest mutex protects all of harvest_context and
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/* /*
* Disallow userspace modification of pure entropy sources. * Disallow userspace modification of pure entropy sources.
*/ */
hc_source_mask = (value & ~user_immutable_mask) | hc_source_mask = (value & ~user_immutable_mask) |
(orig_value & user_immutable_mask); (orig_value & user_immutable_mask);
return (0); return (0);
} }
SYSCTL_PROC(_kern_random_harvest, OID_AUTO, mask, CTLTYPE_UINT | CTLFLAG_RW, SYSCTL_PROC(_kern_random_harvest, OID_AUTO, mask,
NULL, 0, random_check_uint_harvestmask, "IU", "Entropy harvesting mask"); CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, NULL, 0,
random_check_uint_harvestmask, "IU",
"Entropy harvesting mask");
/* ARGSUSED */ /* ARGSUSED */
static int static int
random_print_harvestmask(SYSCTL_HANDLER_ARGS) random_print_harvestmask(SYSCTL_HANDLER_ARGS)
{ {
struct sbuf sbuf; struct sbuf sbuf;
int error, i; int error, i;
error = sysctl_wire_old_buffer(req, 0); error = sysctl_wire_old_buffer(req, 0);
if (error == 0) { if (error == 0) {
sbuf_new_for_sysctl(&sbuf, NULL, 128, req); sbuf_new_for_sysctl(&sbuf, NULL, 128, req);
for (i = ENTROPYSOURCE - 1; i >= 0; i--) for (i = ENTROPYSOURCE - 1; i >= 0; i--)
sbuf_cat(&sbuf, (hc_source_mask & (1 << i)) ? "1" : "0"); sbuf_cat(&sbuf, (hc_source_mask & (1 << i)) ? "1" : "0");
error = sbuf_finish(&sbuf); error = sbuf_finish(&sbuf);
sbuf_delete(&sbuf); sbuf_delete(&sbuf);
} }
return (error); return (error);
} }
SYSCTL_PROC(_kern_random_harvest, OID_AUTO, mask_bin, SYSCTL_PROC(_kern_random_harvest, OID_AUTO, mask_bin,
CTLTYPE_STRING | CTLFLAG_RD, NULL, 0, random_print_harvestmask, "A", CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NEEDGIANT, NULL, 0,
random_print_harvestmask, "A",
"Entropy harvesting mask (printable)"); "Entropy harvesting mask (printable)");
static const char *random_source_descr[ENTROPYSOURCE] = { static const char *random_source_descr[ENTROPYSOURCE] = {
[RANDOM_CACHED] = "CACHED", [RANDOM_CACHED] = "CACHED",
[RANDOM_ATTACH] = "ATTACH", [RANDOM_ATTACH] = "ATTACH",
[RANDOM_KEYBOARD] = "KEYBOARD", [RANDOM_KEYBOARD] = "KEYBOARD",
[RANDOM_MOUSE] = "MOUSE", [RANDOM_MOUSE] = "MOUSE",
[RANDOM_NET_TUN] = "NET_TUN", [RANDOM_NET_TUN] = "NET_TUN",
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first = false; first = false;
} }
error = sbuf_finish(&sbuf); error = sbuf_finish(&sbuf);
sbuf_delete(&sbuf); sbuf_delete(&sbuf);
} }
return (error); return (error);
} }
SYSCTL_PROC(_kern_random_harvest, OID_AUTO, mask_symbolic, SYSCTL_PROC(_kern_random_harvest, OID_AUTO, mask_symbolic,
CTLTYPE_STRING | CTLFLAG_RD, NULL, 0, random_print_harvestmask_symbolic, CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NEEDGIANT, NULL, 0,
"A", "Entropy harvesting mask (symbolic)"); random_print_harvestmask_symbolic, "A",
"Entropy harvesting mask (symbolic)");
/* ARGSUSED */ /* ARGSUSED */
static void static void
random_harvestq_init(void *unused __unused) random_harvestq_init(void *unused __unused)
{ {
static const u_int almost_everything_mask = static const u_int almost_everything_mask =
(((1 << (RANDOM_ENVIRONMENTAL_END + 1)) - 1) & (((1 << (RANDOM_ENVIRONMENTAL_END + 1)) - 1) &
~_RANDOM_HARVEST_ETHER_OFF & ~_RANDOM_HARVEST_UMA_OFF); ~_RANDOM_HARVEST_ETHER_OFF & ~_RANDOM_HARVEST_UMA_OFF);
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