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-rw-r--r--crypto/drbg.c26
1 files changed, 19 insertions, 7 deletions
diff --git a/crypto/drbg.c b/crypto/drbg.c
index b6929eb5f565..e57901d8545b 100644
--- a/crypto/drbg.c
+++ b/crypto/drbg.c
@@ -1087,10 +1087,6 @@ static void drbg_async_seed(struct work_struct *work)
if (ret)
goto unlock;
- /* If nonblocking pool is initialized, deactivate Jitter RNG */
- crypto_free_rng(drbg->jent);
- drbg->jent = NULL;
-
/* Set seeded to false so that if __drbg_seed fails the
* next generate call will trigger a reseed.
*/
@@ -1168,7 +1164,23 @@ static int drbg_seed(struct drbg_state *drbg, struct drbg_string *pers,
entropylen);
if (ret) {
pr_devel("DRBG: jent failed with %d\n", ret);
- goto out;
+
+ /*
+ * Do not treat the transient failure of the
+ * Jitter RNG as an error that needs to be
+ * reported. The combined number of the
+ * maximum reseed threshold times the maximum
+ * number of Jitter RNG transient errors is
+ * less than the reseed threshold required by
+ * SP800-90A allowing us to treat the
+ * transient errors as such.
+ *
+ * However, we mandate that at least the first
+ * seeding operation must succeed with the
+ * Jitter RNG.
+ */
+ if (!reseed || ret != -EAGAIN)
+ goto out;
}
drbg_string_fill(&data1, entropy, entropylen * 2);
@@ -1492,6 +1504,8 @@ static int drbg_prepare_hrng(struct drbg_state *drbg)
if (list_empty(&drbg->test_data.list))
return 0;
+ drbg->jent = crypto_alloc_rng("jitterentropy_rng", 0, 0);
+
INIT_WORK(&drbg->seed_work, drbg_async_seed);
drbg->random_ready.owner = THIS_MODULE;
@@ -1512,8 +1526,6 @@ static int drbg_prepare_hrng(struct drbg_state *drbg)
return err;
}
- drbg->jent = crypto_alloc_rng("jitterentropy_rng", 0, 0);
-
/*
* Require frequent reseeds until the seed source is fully
* initialized.