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crypto: drbg - ignore jitterentropy errors if not in FIPS mode 

A subsequent patch will make the jitterentropy RNG to unconditionally
report health test errors back to callers, independent of whether
fips_enabled is set or not. The DRBG needs access to a functional
jitterentropy instance only in FIPS mode (because it's the only SP800-90B
compliant entropy source as it currently stands). Thus, it is perfectly
fine for the DRBGs to obtain entropy from the jitterentropy source only
on a best effort basis if fips_enabled is off.

Make the DRBGs to ignore jitterentropy failures if fips_enabled is not set.

Signed-off-by: Nicolai Stange <nstange@suse.de>
Reviewed-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Nicolai Stange 2021-11-30 15:10:07 +01:00 committed by Herbert Xu
parent 95fe2253cc
commit 8f79772843
1 changed files with 5 additions and 2 deletions
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7
crypto/drbg.c
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@ -1193,11 +1193,14 @@ static int drbg_seed(struct drbg_state *drbg, struct drbg_string *pers,
pr_devel("DRBG: (re)seeding with %u bytes of entropy\n",
entropylen);
} else {
/* Get seed from Jitter RNG */
/*
* Get seed from Jitter RNG, failures are
* fatal only in FIPS mode.
*/
ret = crypto_rng_get_bytes(drbg->jent,
entropy + entropylen,
entropylen);
if (ret) {
if (fips_enabled && ret) {
pr_devel("DRBG: jent failed with %d\n", ret);
/*