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crypto: aead,cipher - zeroize key buffer after use

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I.G 9.7.B for FIPS 140-3 specifies that variables temporarily holding
cryptographic information should be zeroized once they are no longer
needed. Accomplish this by using kfree_sensitive for buffers that
previously held the private key.

Signed-off-by: Hailey Mothershead <hailmo@amazon.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Hailey Mothershead 2024-04-15 22:19:15 +00:00 committed by Herbert Xu
parent 571e557cba
commit 23e4099bdc
2 changed files with 2 additions and 4 deletions
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3
crypto/aead.c
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@ -36,8 +36,7 @@ static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
memcpy(alignbuffer, key, keylen); memcpy(alignbuffer, key, keylen);
ret = crypto_aead_alg(tfm)->setkey(tfm, alignbuffer, keylen); ret = crypto_aead_alg(tfm)->setkey(tfm, alignbuffer, keylen);
memset(alignbuffer, 0, keylen); kfree_sensitive(buffer);
kfree(buffer);
return ret; return ret;
} }

3
crypto/cipher.c
View File

@ -34,8 +34,7 @@ static int setkey_unaligned(struct crypto_cipher *tfm, const u8 *key,
alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
memcpy(alignbuffer, key, keylen); memcpy(alignbuffer, key, keylen);
ret = cia->cia_setkey(crypto_cipher_tfm(tfm), alignbuffer, keylen); ret = cia->cia_setkey(crypto_cipher_tfm(tfm), alignbuffer, keylen);
memset(alignbuffer, 0, keylen); kfree_sensitive(buffer);
kfree(buffer);
return ret; return ret;
} }