105 lines
2.4 KiB
C
105 lines
2.4 KiB
C
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#include <sys/zfs_context.h>
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#include <sys/splat-ctl.h>
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#define KZT_SUBSYSTEM_KRNG 0x0300
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#define KZT_KRNG_NAME "krng"
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#define KZT_KRNG_DESC "Kernel Random Number Generator Tests"
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#define KZT_KRNG_TEST1_ID 0x0301
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#define KZT_KRNG_TEST1_NAME "freq"
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#define KZT_KRNG_TEST1_DESC "Frequency Test"
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#define KRNG_NUM_BITS 1048576
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#define KRNG_NUM_BYTES (KRNG_NUM_BITS >> 3)
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#define KRNG_NUM_BITS_DIV2 (KRNG_NUM_BITS >> 1)
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#define KRNG_ERROR_RANGE 2097
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/* Random Number Generator Tests
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There can be meny more tests on quality of the
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random number generator. For now we are only
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testing the frequency of particular bits.
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We could also test consecutive sequences,
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randomness within a particular block, etc.
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but is probably not necessary for our purposes */
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static int
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kzt_krng_test1(struct file *file, void *arg)
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{
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uint8_t *buf;
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int i, j, diff, num = 0, rc = 0;
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buf = kmalloc(sizeof(*buf) * KRNG_NUM_BYTES, GFP_KERNEL);
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if (buf == NULL) {
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rc = -ENOMEM;
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goto out;
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}
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memset(buf, 0, sizeof(*buf) * KRNG_NUM_BYTES);
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/* Always succeeds */
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random_get_pseudo_bytes(buf, sizeof(uint8_t) * KRNG_NUM_BYTES);
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for (i = 0; i < KRNG_NUM_BYTES; i++) {
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uint8_t tmp = buf[i];
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for (j = 0; j < 8; j++) {
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uint8_t tmp2 = ((tmp >> j) & 0x01);
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if (tmp2 == 1) {
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num++;
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}
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}
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}
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kfree(buf);
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diff = KRNG_NUM_BITS_DIV2 - num;
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if (diff < 0)
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diff *= -1;
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kzt_print(file, "Test 1 Number of ones: %d\n", num);
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kzt_print(file, "Test 1 Difference from expected: %d Allowed: %d\n",
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diff, KRNG_ERROR_RANGE);
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if (diff > KRNG_ERROR_RANGE)
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rc = -ERANGE;
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out:
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return rc;
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}
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kzt_subsystem_t *
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kzt_krng_init(void)
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{
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kzt_subsystem_t *sub;
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sub = kmalloc(sizeof(*sub), GFP_KERNEL);
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if (sub == NULL)
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return NULL;
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memset(sub, 0, sizeof(*sub));
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strncpy(sub->desc.name, KZT_KRNG_NAME, KZT_NAME_SIZE);
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strncpy(sub->desc.desc, KZT_KRNG_DESC, KZT_DESC_SIZE);
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INIT_LIST_HEAD(&sub->subsystem_list);
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INIT_LIST_HEAD(&sub->test_list);
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spin_lock_init(&sub->test_lock);
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sub->desc.id = KZT_SUBSYSTEM_KRNG;
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KZT_TEST_INIT(sub, KZT_KRNG_TEST1_NAME, KZT_KRNG_TEST1_DESC,
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KZT_KRNG_TEST1_ID, kzt_krng_test1);
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return sub;
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}
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void
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kzt_krng_fini(kzt_subsystem_t *sub)
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{
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ASSERT(sub);
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KZT_TEST_FINI(sub, KZT_KRNG_TEST1_ID);
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kfree(sub);
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}
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int
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kzt_krng_id(void) {
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return KZT_SUBSYSTEM_KRNG;
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}
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