linux-kernel - [PATCH 3.16 054/204] security/keys: properly zero out sensitive key material in big

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Date:   Thu, 28 Dec 2017 17:05:44 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Herbert Xu" <herbert@...dor.apana.org.au>, security@...nel.org,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        "Kirill Marinushkin" <k.marinushkin@...il.com>,
        "Eric Biggers" <ebiggers3@...il.com>,
        "David Howells" <dhowells@...hat.com>
Subject: [PATCH 3.16 054/204] security/keys: properly zero out sensitive
 key material in big_key

3.16.52-rc1 review patch.  If anyone has any objections, please let me know.

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

From: "Jason A. Donenfeld" <Jason@...c4.com>

commit 910801809b2e40a4baedd080ef5d80b4a180e70e upstream.

Error paths forgot to zero out sensitive material, so this patch changes
some kfrees into a kzfrees.

Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
Signed-off-by: David Howells <dhowells@...hat.com>
Reviewed-by: Eric Biggers <ebiggers3@...il.com>
Cc: Herbert Xu <herbert@...dor.apana.org.au>
Cc: Kirill Marinushkin <k.marinushkin@...il.com>
Cc: security@...nel.org
[bwh: Backported to 3.16: there's only one kfree() to change]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 security/keys/big_key.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

--- a/security/keys/big_key.c
+++ b/security/keys/big_key.c
@@ -135,7 +135,7 @@ void big_key_destroy(struct key *key)
 		path->mnt = NULL;
 		path->dentry = NULL;
 	} else {
-		kfree(key->payload.data);
+		kzfree(key->payload.data);
 		key->payload.data = NULL;
 	}
 }