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authorStephan Mueller <smueller@chronox.de>2014-08-17 17:39:31 +0200
committerHerbert Xu <herbert@gondor.apana.org.au>2014-08-25 20:34:11 +0800
commite6c0244ad38a358598392638688b1dcac7878f66 (patch)
tree974c13306d5fbbfbc221839ec667511247288149 /crypto
parentf072f0e0fe0f3758c7c94bee875564c89fd07d08 (diff)
downloadlinux-e6c0244ad38a358598392638688b1dcac7878f66.tar.bz2
crypto: drbg - use kmalloc instead of kzalloc for V and C
When allocating V, C, the zeroization is only needed when allocating a new instance of the DRBG, i.e. when performing an initial seeding. For all other allocations, the memcpy implemented in drbg_copy_drbg ensures that the memory is filled with the correct information. Signed-off-by: Stephan Mueller <smueller@chronox.de> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/drbg.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/crypto/drbg.c b/crypto/drbg.c
index 86cffc600acd..ebe0afc4e94b 100644
--- a/crypto/drbg.c
+++ b/crypto/drbg.c
@@ -1142,6 +1142,11 @@ static int drbg_seed(struct drbg_state *drbg, struct drbg_string *pers,
pr_devel("DRBG: using personalization string\n");
}
+ if (!reseed) {
+ memset(drbg->V, 0, drbg_statelen(drbg));
+ memset(drbg->C, 0, drbg_statelen(drbg));
+ }
+
ret = drbg->d_ops->update(drbg, &seedlist, reseed);
if (ret)
goto out;
@@ -1186,14 +1191,14 @@ static inline int drbg_alloc_state(struct drbg_state *drbg)
if (!drbg)
return -EINVAL;
- drbg->V = kzalloc(drbg_statelen(drbg), GFP_KERNEL);
+ drbg->V = kmalloc(drbg_statelen(drbg), GFP_KERNEL);
if (!drbg->V)
goto err;
- drbg->C = kzalloc(drbg_statelen(drbg), GFP_KERNEL);
+ drbg->C = kmalloc(drbg_statelen(drbg), GFP_KERNEL);
if (!drbg->C)
goto err;
#ifdef CONFIG_CRYPTO_FIPS
- drbg->prev = kzalloc(drbg_blocklen(drbg), GFP_KERNEL);
+ drbg->prev = kmalloc(drbg_blocklen(drbg), GFP_KERNEL);
if (!drbg->prev)
goto err;
drbg->fips_primed = false;