linux-kernel - [PATCH] crypto: crypto_user_stat: Zeroize whole structure given to user space

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Date:   Fri, 19 Oct 2018 12:27:25 +0000
From:   Corentin Labbe <clabbe@...libre.com>
To:     dan.carpenter@...cle.com, davem@...emloft.net,
        herbert@...dor.apana.org.au
Cc:     linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        Corentin Labbe <clabbe@...libre.com>
Subject: [PATCH] crypto: crypto_user_stat: Zeroize whole structure given to user space

For preventing un-initilized data to be given to user-space (and so leak
potential useful data), the crypto_stat structure must be correctly
initialised.

Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Fixes: cac5818c25d0 ("crypto: user - Implement a generic crypto statistics")
Signed-off-by: Corentin Labbe <clabbe@...libre.com>
---
 crypto/crypto_user_stat.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/crypto/crypto_user_stat.c b/crypto/crypto_user_stat.c
index 021ad06bbb62..9990c599f648 100644
--- a/crypto/crypto_user_stat.c
+++ b/crypto/crypto_user_stat.c
@@ -37,6 +37,7 @@ static int crypto_report_aead(struct sk_buff *skb, struct crypto_alg *alg)
 	u64 v64;
 	u32 v32;
 
+	memset(&raead, 0, sizeof(struct crypto_stat));
 	strncpy(raead.type, "aead", sizeof(raead.type));
 
 	v32 = atomic_read(&alg->encrypt_cnt);
@@ -65,6 +66,7 @@ static int crypto_report_cipher(struct sk_buff *skb, struct crypto_alg *alg)
 	u64 v64;
 	u32 v32;
 
+	memset(&rcipher, 0, sizeof(struct crypto_stat));
 	strlcpy(rcipher.type, "cipher", sizeof(rcipher.type));
 
 	v32 = atomic_read(&alg->encrypt_cnt);
@@ -93,6 +95,7 @@ static int crypto_report_comp(struct sk_buff *skb, struct crypto_alg *alg)
 	u64 v64;
 	u32 v32;
 
+	memset(&rcomp, 0, sizeof(struct crypto_stat));
 	strlcpy(rcomp.type, "compression", sizeof(rcomp.type));
 	v32 = atomic_read(&alg->compress_cnt);
 	rcomp.stat_compress_cnt = v32;
@@ -120,6 +123,7 @@ static int crypto_report_acomp(struct sk_buff *skb, struct crypto_alg *alg)
 	u64 v64;
 	u32 v32;
 
+	memset(&racomp, 0, sizeof(struct crypto_stat));
 	strlcpy(racomp.type, "acomp", sizeof(racomp.type));
 	v32 = atomic_read(&alg->compress_cnt);
 	racomp.stat_compress_cnt = v32;
@@ -147,6 +151,7 @@ static int crypto_report_akcipher(struct sk_buff *skb, struct crypto_alg *alg)
 	u64 v64;
 	u32 v32;
 
+	memset(&rakcipher, 0, sizeof(struct crypto_stat));
 	strncpy(rakcipher.type, "akcipher", sizeof(rakcipher.type));
 	v32 = atomic_read(&alg->encrypt_cnt);
 	rakcipher.stat_encrypt_cnt = v32;
@@ -177,6 +182,7 @@ static int crypto_report_kpp(struct sk_buff *skb, struct crypto_alg *alg)
 	struct crypto_stat rkpp;
 	u32 v;
 
+	memset(&rkpp, 0, sizeof(struct crypto_stat));
 	strlcpy(rkpp.type, "kpp", sizeof(rkpp.type));
 
 	v = atomic_read(&alg->setsecret_cnt);
@@ -203,6 +209,7 @@ static int crypto_report_ahash(struct sk_buff *skb, struct crypto_alg *alg)
 	u64 v64;
 	u32 v32;
 
+	memset(&rhash, 0, sizeof(struct crypto_stat));
 	strncpy(rhash.type, "ahash", sizeof(rhash.type));
 
 	v32 = atomic_read(&alg->hash_cnt);
@@ -227,6 +234,7 @@ static int crypto_report_shash(struct sk_buff *skb, struct crypto_alg *alg)
 	u64 v64;
 	u32 v32;
 
+	memset(&rhash, 0, sizeof(struct crypto_stat));
 	strncpy(rhash.type, "shash", sizeof(rhash.type));
 
 	v32 = atomic_read(&alg->hash_cnt);
@@ -251,6 +259,7 @@ static int crypto_report_rng(struct sk_buff *skb, struct crypto_alg *alg)
 	u64 v64;
 	u32 v32;
 
+	memset(&rrng, 0, sizeof(struct crypto_stat));
 	strncpy(rrng.type, "rng", sizeof(rrng.type));
 
 	v32 = atomic_read(&alg->generate_cnt);
-- 
2.18.1