| From | Greg Kroah-Hartman <> | Subject | [ 027/120] xfrm_user: fix info leak in copy_to_user_auth() | Date | Thu, 11 Oct 2012 09:59:39 +0900 |
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3.4-stable review patch. If anyone has any objections, please let me know.
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From: Mathias Krause <minipli@googlemail.com>
[ Upstream commit 4c87308bdea31a7b4828a51f6156e6f721a1fcc9 ]
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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- net/xfrm/xfrm_user.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/xfrm/xfrm_user.c +++ b/net/xfrm/xfrm_user.c @@ -742,7 +742,7 @@ static int copy_to_user_auth(struct xfrm return -EMSGSIZE; 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); algo->alg_key_len = auth->alg_key_len;
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