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xfrm_user: fix info leak in copy_to_user_auth() 

copy_to_user_auth() fails to initialize the remainder of alg_name and
therefore discloses up to 54 bytes of heap memory via netlink to
userland.

Use strncpy() instead of strcpy() to fill the trailing bytes of alg_name
with null bytes.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Acked-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mathias Krause 2012-09-19 11:33:38 +00:00 committed by David S. Miller
parent 9db273f456
commit 4c87308bde
1 changed files with 1 additions and 1 deletions
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2
net/xfrm/xfrm_user.c
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@ -742,7 +742,7 @@ static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
return -EMSGSIZE; return -EMSGSIZE;
algo = nla_data(nla); algo = nla_data(nla);
strcpy(algo->alg_name, auth->alg_name); strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8); memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
algo->alg_key_len = auth->alg_key_len; algo->alg_key_len = auth->alg_key_len;