linux-kernel - [PATCH v2] KEYS: use kfree

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Message-ID: <20230615125712.105873-1-mngyadam@amazon.com>
Date:   Thu, 15 Jun 2023 12:57:13 +0000
From:   Mahmoud Adam <mngyadam@...zon.com>
To:     <dhowells@...hat.com>
CC:     <herbert@...dor.apana.org.au>, <davem@...emloft.net>,
        <keyrings@...r.kernel.org>, <linux-crypto@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Mahmoud Adam <mngyadam@...zon.com>
Subject: [PATCH v2] KEYS: use kfree_sensitive with key

key might contain private part of the key, so better use
kfree_sensitive to free it

Signed-off-by: Mahmoud Adam <mngyadam@...zon.com>
---
v2: kfree_sensitive only private key

 crypto/asymmetric_keys/public_key.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/crypto/asymmetric_keys/public_key.c b/crypto/asymmetric_keys/public_key.c
index eca5671ad3f2..cd8c4123d936 100644
--- a/crypto/asymmetric_keys/public_key.c
+++ b/crypto/asymmetric_keys/public_key.c
@@ -43,7 +43,10 @@ static void public_key_describe(const struct key *asymmetric_key,
 void public_key_free(struct public_key *key)
 {
 	if (key) {
-		kfree(key->key);
+		if(key->key_is_private)
+			kfree_sensitive(key->key);
+		else
+			kfree(key->key);
 		kfree(key->params);
 		kfree(key);
 	}
@@ -218,7 +221,7 @@ static int software_key_query(const struct kernel_pkey_params *params,
 	ret = 0;

 error_free_key:
-	kfree(key);
+	kfree_sensitive(key);
 error_free_tfm:
 	crypto_free_akcipher(tfm);
 	pr_devel("<==%s() = %d\n", __func__, ret);
@@ -303,7 +306,7 @@ static int software_key_eds_op(struct kernel_pkey_params *params,
 		ret = req->dst_len;

 error_free_key:
-	kfree(key);
+	kfree_sensitive(key);
 error_free_req:
 	akcipher_request_free(req);
 error_free_tfm:
@@ -456,7 +459,7 @@ int public_key_verify_signature(const struct public_key *pkey,
 	ret = crypto_wait_req(crypto_akcipher_verify(req), &cwait);

 error_free_key:
-	kfree(key);
+	kfree_sensitive(key);
 error_free_req:
 	akcipher_request_free(req);
 error_free_tfm:
--
2.40.1