Please ignore this one. This patch is already in your stable queue.
Regards,
Amit Pundir
On 26 July 2017 at 01:37, Amit Pundir <amit.pundir@xxxxxxxxxx> wrote:
> From: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
>
> commit 096f41d3a8fcbb8dde7f71379b1ca85fe213eded upstream.
>
> The parsing of sadb_x_ipsecrequest is broken in a number of ways.
> First of all we're not verifying sadb_x_ipsecrequest_len. This
> is needed when the structure carries addresses at the end. Worse
> we don't even look at the length when we parse those optional
> addresses.
>
> The migration code had similar parsing code that's better but
> it also has some deficiencies. The length is overcounted first
> of all as it includes the header itself. It also fails to check
> the length before dereferencing the sa_family field.
>
> This patch fixes those problems in parse_sockaddr_pair and then
> uses it in parse_ipsecrequest.
>
> Reported-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
> Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
> Signed-off-by: Amit Pundir <amit.pundir@xxxxxxxxxx>
> ---
> net/key/af_key.c | 47 ++++++++++++++++++++++++++---------------------
> 1 file changed, 26 insertions(+), 21 deletions(-)
>
> diff --git a/net/key/af_key.c b/net/key/af_key.c
> index e67c28e614b9..d8d95b6415e4 100644
> --- a/net/key/af_key.c
> +++ b/net/key/af_key.c
> @@ -65,6 +65,10 @@ struct pfkey_sock {
> } dump;
> };
>
> +static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
> + xfrm_address_t *saddr, xfrm_address_t *daddr,
> + u16 *family);
> +
> static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
> {
> return (struct pfkey_sock *)sk;
> @@ -1922,19 +1926,14 @@ parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
>
> /* addresses present only in tunnel mode */
> if (t->mode == XFRM_MODE_TUNNEL) {
> - u8 *sa = (u8 *) (rq + 1);
> - int family, socklen;
> + int err;
>
> - family = pfkey_sockaddr_extract((struct sockaddr *)sa,
> - &t->saddr);
> - if (!family)
> - return -EINVAL;
> -
> - socklen = pfkey_sockaddr_len(family);
> - if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
> - &t->id.daddr) != family)
> - return -EINVAL;
> - t->encap_family = family;
> + err = parse_sockaddr_pair(
> + (struct sockaddr *)(rq + 1),
> + rq->sadb_x_ipsecrequest_len - sizeof(*rq),
> + &t->saddr, &t->id.daddr, &t->encap_family);
> + if (err)
> + return err;
> } else
> t->encap_family = xp->family;
>
> @@ -1954,7 +1953,11 @@ parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
> if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
> return -EINVAL;
>
> - while (len >= sizeof(struct sadb_x_ipsecrequest)) {
> + while (len >= sizeof(*rq)) {
> + if (len < rq->sadb_x_ipsecrequest_len ||
> + rq->sadb_x_ipsecrequest_len < sizeof(*rq))
> + return -EINVAL;
> +
> if ((err = parse_ipsecrequest(xp, rq)) < 0)
> return err;
> len -= rq->sadb_x_ipsecrequest_len;
> @@ -2417,7 +2420,6 @@ out:
> return err;
> }
>
> -#ifdef CONFIG_NET_KEY_MIGRATE
> static int pfkey_sockaddr_pair_size(sa_family_t family)
> {
> return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
> @@ -2429,7 +2431,7 @@ static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
> {
> int af, socklen;
>
> - if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
> + if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
> return -EINVAL;
>
> af = pfkey_sockaddr_extract(sa, saddr);
> @@ -2445,6 +2447,7 @@ static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
> return 0;
> }
>
> +#ifdef CONFIG_NET_KEY_MIGRATE
> static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
> struct xfrm_migrate *m)
> {
> @@ -2452,13 +2455,14 @@ static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
> struct sadb_x_ipsecrequest *rq2;
> int mode;
>
> - if (len <= sizeof(struct sadb_x_ipsecrequest) ||
> - len < rq1->sadb_x_ipsecrequest_len)
> + if (len < sizeof(*rq1) ||
> + len < rq1->sadb_x_ipsecrequest_len ||
> + rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
> return -EINVAL;
>
> /* old endoints */
> err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
> - rq1->sadb_x_ipsecrequest_len,
> + rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
> &m->old_saddr, &m->old_daddr,
> &m->old_family);
> if (err)
> @@ -2467,13 +2471,14 @@ static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
> rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
> len -= rq1->sadb_x_ipsecrequest_len;
>
> - if (len <= sizeof(struct sadb_x_ipsecrequest) ||
> - len < rq2->sadb_x_ipsecrequest_len)
> + if (len <= sizeof(*rq2) ||
> + len < rq2->sadb_x_ipsecrequest_len ||
> + rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
> return -EINVAL;
>
> /* new endpoints */
> err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
> - rq2->sadb_x_ipsecrequest_len,
> + rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
> &m->new_saddr, &m->new_daddr,
> &m->new_family);
> if (err)
> --
> 2.7.4
>