[PATCH 6.9 022/197] crypto: aead,cipher - zeroize key buffer after use

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6.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hailey Mothershead <hailmo@xxxxxxxxxx>

[ Upstream commit 23e4099bdc3c8381992f9eb975c79196d6755210 ]

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@xxxxxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 crypto/aead.c   | 3 +--
 crypto/cipher.c | 3 +--
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/crypto/aead.c b/crypto/aead.c
index 54906633566a2..5f3c1954d8e5d 100644
--- a/crypto/aead.c
+++ b/crypto/aead.c
@@ -45,8 +45,7 @@ static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
 	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
 	memcpy(alignbuffer, key, keylen);
 	ret = crypto_aead_alg(tfm)->setkey(tfm, alignbuffer, keylen);
-	memset(alignbuffer, 0, keylen);
-	kfree(buffer);
+	kfree_sensitive(buffer);
 	return ret;
 }
 
diff --git a/crypto/cipher.c b/crypto/cipher.c
index 47c77a3e59783..40cae908788ec 100644
--- a/crypto/cipher.c
+++ b/crypto/cipher.c
@@ -34,8 +34,7 @@ static int setkey_unaligned(struct crypto_cipher *tfm, const u8 *key,
 	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
 	memcpy(alignbuffer, key, keylen);
 	ret = cia->cia_setkey(crypto_cipher_tfm(tfm), alignbuffer, keylen);
-	memset(alignbuffer, 0, keylen);
-	kfree(buffer);
+	kfree_sensitive(buffer);
 	return ret;
 
 }
-- 
2.43.0







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