Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Alex Dewar <alex.dewar90@gmail.com>
Cc:     Alex Dewar <alex.dewar90@gmail.com>,
        David Howells <dhowells@redhat.com>,
        Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
        James Morris <jmorris@namei.org>,
        "Serge E. Hallyn" <serge@hallyn.com>, keyrings@vger.kernel.org,
        linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2] security: keys: Use kvfree_sensitive in a few places
Date:   Fri, 11 Sep 2020 17:06:50 +0100
Message-Id: <20200911160649.20164-1-alex.dewar90@gmail.com>
In-Reply-To: <20200911160009.n2drvcjpzrsloxcj@lenovo-laptop>
References: <20200911160009.n2drvcjpzrsloxcj@lenovo-laptop>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
To:     unlisted-recipients:; (no To-header on input)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

In big_key.c, there are a few places where memzero_explicit + kvfree is
used. Replace these with a single call to kvfree_sensitive, to make the
code more readable.

Signed-off-by: Alex Dewar <alex.dewar90@gmail.com>
---
v2 - Update commit message as per James Bottomley's suggestion

 security/keys/big_key.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/security/keys/big_key.c b/security/keys/big_key.c
index 691347dea3c1..d17e5f09eeb8 100644
--- a/security/keys/big_key.c
+++ b/security/keys/big_key.c
@@ -121,8 +121,7 @@ int big_key_preparse(struct key_preparsed_payload *prep)
 		*path = file->f_path;
 		path_get(path);
 		fput(file);
-		memzero_explicit(buf, enclen);
-		kvfree(buf);
+		kvfree_sensitive(buf, enclen);
 	} else {
 		/* Just store the data in a buffer */
 		void *data = kmalloc(datalen, GFP_KERNEL);
@@ -140,8 +139,7 @@ int big_key_preparse(struct key_preparsed_payload *prep)
 err_enckey:
 	kfree_sensitive(enckey);
 error:
-	memzero_explicit(buf, enclen);
-	kvfree(buf);
+	kvfree_sensitive(buf, enclen);
 	return ret;
 }
 
@@ -273,8 +271,7 @@ long big_key_read(const struct key *key, char *buffer, size_t buflen)
 err_fput:
 		fput(file);
 error:
-		memzero_explicit(buf, enclen);
-		kvfree(buf);
+		kvfree_sensitive(buf, enclen);
 	} else {
 		ret = datalen;
 		memcpy(buffer, key->payload.data[big_key_data], datalen);
-- 
2.28.0