[PATCH 05/38] crypto: drbg - Fix the fips_enabled priority boost

[Eric Biggers <ebiggers@kernel.org>]

When fips_enabled=1, it seems to have been intended for one of the
algorithms defined in crypto/drbg.c to be the highest priority "stdrng"
algorithm, so that it is what is used by "stdrng" users.

However, the code only boosts the priority to 400, which is less than
the priority 500 used in drivers/crypto/caam/caamprng.c.  Thus, the CAAM
RNG could be used instead.

Fix this by boosting the priority by 2000 instead of 200.

Fixes: 541af946fe13 ("crypto: drbg - SP800-90A Deterministic Random Bit Generator")
Cc: stable@vger.kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
---
 crypto/drbg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crypto/drbg.c b/crypto/drbg.c
index f23b431bd490..e3065fb9541b 100644
--- a/crypto/drbg.c
+++ b/crypto/drbg.c
@@ -1830,11 +1830,11 @@ static inline void __init drbg_fill_array(struct rng_alg *alg,
 	 * If FIPS mode enabled, the selected DRBG shall have the
 	 * highest cra_priority over other stdrng instances to ensure
 	 * it is selected.
 	 */
 	if (fips_enabled)
-		alg->base.cra_priority += 200;
+		alg->base.cra_priority += 2000;
 
 	alg->base.cra_ctxsize 	= sizeof(struct drbg_state);
 	alg->base.cra_module	= THIS_MODULE;
 	alg->base.cra_init	= drbg_kcapi_init;
 	alg->base.cra_exit	= drbg_kcapi_cleanup;
-- 
2.53.0