netdev - [PATCH] af_key: Fix heap information leak

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Message-ID: <20230204175018.GA7246@ubuntu>
Date:   Sat, 4 Feb 2023 09:50:18 -0800
From:   Hyunwoo Kim <v4bel@...ori.io>
To:     steffen.klassert@...unet.com, herbert@...dor.apana.org.au,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com
Cc:     v4bel@...ori.io, imv4bel@...il.com, netdev@...r.kernel.org
Subject: [PATCH] af_key: Fix heap information leak

Since x->calg etc. are allocated with kmalloc, information
in kernel heap can be leaked using netlink socket on
systems without CONFIG_INIT_ON_ALLOC_DEFAULT_ON.

Signed-off-by: Hyunwoo Kim <v4bel@...ori.io>
---
 net/key/af_key.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/key/af_key.c b/net/key/af_key.c
index 2bdbcec781cd..9a7adcaf6aa3 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -1174,7 +1174,7 @@ static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
 		}
 		if (key)
 			keysize = (key->sadb_key_bits + 7) / 8;
-		x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
+		x->aalg = kzalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
 		if (!x->aalg) {
 			err = -ENOMEM;
 			goto out;
@@ -1196,7 +1196,7 @@ static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
 				err = -ENOSYS;
 				goto out;
 			}
-			x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
+			x->calg = kzalloc(sizeof(*x->calg), GFP_KERNEL);
 			if (!x->calg) {
 				err = -ENOMEM;
 				goto out;
@@ -1213,7 +1213,7 @@ static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
 			key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
 			if (key)
 				keysize = (key->sadb_key_bits + 7) / 8;
-			x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
+			x->ealg = kzalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
 			if (!x->ealg) {
 				err = -ENOMEM;
 				goto out;
@@ -1261,7 +1261,7 @@ static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
 		const struct sadb_x_nat_t_type* n_type;
 		struct xfrm_encap_tmpl *natt;
 
-		x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
+		x->encap = kzalloc(sizeof(*x->encap), GFP_KERNEL);
 		if (!x->encap) {
 			err = -ENOMEM;
 			goto out;
-- 
2.25.1