linux-kernel - [PATCH] crypto: sun4i-ss: erase key after use

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190915183536.3835-1-clabbe.montjoie@gmail.com>
Date:   Sun, 15 Sep 2019 20:35:36 +0200
From:   Corentin Labbe <clabbe.montjoie@...il.com>
To:     davem@...emloft.net, herbert@...dor.apana.org.au,
        mripard@...nel.org, wens@...e.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com,
        Corentin Labbe <clabbe.montjoie@...il.com>,
        stable@...r.kernel.org
Subject: [PATCH] crypto: sun4i-ss: erase key after use

When a TFM is unregistered, the sun4i-ss driver does not clean the key used,
leaking it in memory.
This patch adds this absent key cleaning.

Fixes: 6298e948215f ("crypto: sunxi-ss - Add Allwinner Security System crypto accelerator")
Cc: <stable@...r.kernel.org> # 4.3+
Signed-off-by: Corentin Labbe <clabbe.montjoie@...il.com>
---
 drivers/crypto/sunxi-ss/sun4i-ss-cipher.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/crypto/sunxi-ss/sun4i-ss-cipher.c b/drivers/crypto/sunxi-ss/sun4i-ss-cipher.c
index fa4b1b47822e..60d99370a4ec 100644
--- a/drivers/crypto/sunxi-ss/sun4i-ss-cipher.c
+++ b/drivers/crypto/sunxi-ss/sun4i-ss-cipher.c
@@ -503,6 +503,8 @@ int sun4i_ss_cipher_init(struct crypto_tfm *tfm)
 void sun4i_ss_cipher_exit(struct crypto_tfm *tfm)
 {
 	struct sun4i_tfm_ctx *op = crypto_tfm_ctx(tfm);
+
+	memzero_explicit(op->key, op->keylen);
 	crypto_free_sync_skcipher(op->fallback_tfm);
 }
 
-- 
2.21.0