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-rw-r--r--net/xfrm/xfrm_user.c125
1 files changed, 31 insertions, 94 deletions
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 9103af02473c..1371a0ae0606 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -42,19 +42,12 @@ static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type)
{
struct rtattr *rt = xfrma[type - 1];
struct xfrm_algo *algp;
- int len;
if (!rt)
return 0;
- len = (rt->rta_len - sizeof(*rt)) - sizeof(*algp);
- if (len < 0)
- return -EINVAL;
-
algp = RTA_DATA(rt);
-
- len -= (algp->alg_key_len + 7U) / 8;
- if (len < 0)
+ if (RTA_PAYLOAD(rt) < alg_len(algp))
return -EINVAL;
switch (type) {
@@ -82,55 +75,25 @@ static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type)
return 0;
}
-static int verify_encap_tmpl(struct rtattr **xfrma)
-{
- struct rtattr *rt = xfrma[XFRMA_ENCAP - 1];
- struct xfrm_encap_tmpl *encap;
-
- if (!rt)
- return 0;
-
- if ((rt->rta_len - sizeof(*rt)) < sizeof(*encap))
- return -EINVAL;
-
- return 0;
-}
-
-static int verify_one_addr(struct rtattr **xfrma, enum xfrm_attr_type_t type,
+static void verify_one_addr(struct rtattr **xfrma, enum xfrm_attr_type_t type,
xfrm_address_t **addrp)
{
struct rtattr *rt = xfrma[type - 1];
- if (!rt)
- return 0;
-
- if ((rt->rta_len - sizeof(*rt)) < sizeof(**addrp))
- return -EINVAL;
-
- if (addrp)
+ if (rt && addrp)
*addrp = RTA_DATA(rt);
-
- return 0;
}
static inline int verify_sec_ctx_len(struct rtattr **xfrma)
{
struct rtattr *rt = xfrma[XFRMA_SEC_CTX - 1];
struct xfrm_user_sec_ctx *uctx;
- int len = 0;
if (!rt)
return 0;
- if (rt->rta_len < sizeof(*uctx))
- return -EINVAL;
-
uctx = RTA_DATA(rt);
-
- len += sizeof(struct xfrm_user_sec_ctx);
- len += uctx->ctx_len;
-
- if (uctx->len != len)
+ if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
return -EINVAL;
return 0;
@@ -205,12 +168,8 @@ static int verify_newsa_info(struct xfrm_usersa_info *p,
goto out;
if ((err = verify_one_alg(xfrma, XFRMA_ALG_COMP)))
goto out;
- if ((err = verify_encap_tmpl(xfrma)))
- goto out;
if ((err = verify_sec_ctx_len(xfrma)))
goto out;
- if ((err = verify_one_addr(xfrma, XFRMA_COADDR, NULL)))
- goto out;
err = -EINVAL;
switch (p->mode) {
@@ -339,9 +298,8 @@ static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *
* somehow made shareable and move it to xfrm_state.c - JHS
*
*/
-static int xfrm_update_ae_params(struct xfrm_state *x, struct rtattr **xfrma)
+static void xfrm_update_ae_params(struct xfrm_state *x, struct rtattr **xfrma)
{
- int err = - EINVAL;
struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];
struct rtattr *et = xfrma[XFRMA_ETIMER_THRESH-1];
@@ -349,8 +307,6 @@ static int xfrm_update_ae_params(struct xfrm_state *x, struct rtattr **xfrma)
if (rp) {
struct xfrm_replay_state *replay;
- if (RTA_PAYLOAD(rp) < sizeof(*replay))
- goto error;
replay = RTA_DATA(rp);
memcpy(&x->replay, replay, sizeof(*replay));
memcpy(&x->preplay, replay, sizeof(*replay));
@@ -358,8 +314,6 @@ static int xfrm_update_ae_params(struct xfrm_state *x, struct rtattr **xfrma)
if (lt) {
struct xfrm_lifetime_cur *ltime;
- if (RTA_PAYLOAD(lt) < sizeof(*ltime))
- goto error;
ltime = RTA_DATA(lt);
x->curlft.bytes = ltime->bytes;
x->curlft.packets = ltime->packets;
@@ -367,21 +321,11 @@ static int xfrm_update_ae_params(struct xfrm_state *x, struct rtattr **xfrma)
x->curlft.use_time = ltime->use_time;
}
- if (et) {
- if (RTA_PAYLOAD(et) < sizeof(u32))
- goto error;
+ if (et)
x->replay_maxage = *(u32*)RTA_DATA(et);
- }
- if (rt) {
- if (RTA_PAYLOAD(rt) < sizeof(u32))
- goto error;
+ if (rt)
x->replay_maxdiff = *(u32*)RTA_DATA(rt);
- }
-
- return 0;
-error:
- return err;
}
static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
@@ -429,9 +373,7 @@ static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
/* override default values from above */
- err = xfrm_update_ae_params(x, (struct rtattr **)xfrma);
- if (err < 0)
- goto error;
+ xfrm_update_ae_params(x, (struct rtattr **)xfrma);
return x;
@@ -497,10 +439,7 @@ static struct xfrm_state *xfrm_user_state_lookup(struct xfrm_usersa_id *p,
} else {
xfrm_address_t *saddr = NULL;
- err = verify_one_addr(xfrma, XFRMA_SRCADDR, &saddr);
- if (err)
- goto out;
-
+ verify_one_addr(xfrma, XFRMA_SRCADDR, &saddr);
if (!saddr) {
err = -EINVAL;
goto out;
@@ -1072,9 +1011,6 @@ static int copy_from_user_policy_type(u8 *tp, struct rtattr **xfrma)
int err;
if (rt) {
- if (rt->rta_len < sizeof(*upt))
- return -EINVAL;
-
upt = RTA_DATA(rt);
type = upt->type;
}
@@ -1537,10 +1473,8 @@ static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
goto out;
spin_lock_bh(&x->lock);
- err = xfrm_update_ae_params(x, xfrma);
+ xfrm_update_ae_params(x, xfrma);
spin_unlock_bh(&x->lock);
- if (err < 0)
- goto out;
c.event = nlh->nlmsg_type;
c.seq = nlh->nlmsg_seq;
@@ -1726,20 +1660,6 @@ static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
}
#ifdef CONFIG_XFRM_MIGRATE
-static int verify_user_migrate(struct rtattr **xfrma)
-{
- struct rtattr *rt = xfrma[XFRMA_MIGRATE-1];
- struct xfrm_user_migrate *um;
-
- if (!rt)
- return -EINVAL;
-
- if ((rt->rta_len - sizeof(*rt)) < sizeof(*um))
- return -EINVAL;
-
- return 0;
-}
-
static int copy_from_user_migrate(struct xfrm_migrate *ma,
struct rtattr **xfrma, int *num)
{
@@ -1780,9 +1700,8 @@ static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
int err;
int n = 0;
- err = verify_user_migrate((struct rtattr **)xfrma);
- if (err)
- return err;
+ if (xfrma[XFRMA_MIGRATE-1] == NULL)
+ return -EINVAL;
err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma);
if (err)
@@ -1917,6 +1836,23 @@ static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
#undef XMSGSIZE
+static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
+ [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
+ [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
+ [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
+ [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
+ [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
+ [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
+ [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
+ [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
+ [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
+ [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
+ [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
+ [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
+ [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
+ [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
+};
+
static struct xfrm_link {
int (*doit)(struct sk_buff *, struct nlmsghdr *, struct rtattr **);
int (*dump)(struct sk_buff *, struct netlink_callback *);
@@ -1972,7 +1908,8 @@ static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
/* FIXME: Temporary hack, nlmsg_parse() starts at xfrma[1], old code
* expects first attribute at xfrma[0] */
- err = nlmsg_parse(nlh, xfrm_msg_min[type], xfrma-1, XFRMA_MAX, NULL);
+ err = nlmsg_parse(nlh, xfrm_msg_min[type], xfrma-1, XFRMA_MAX,
+ xfrma_policy);
if (err < 0)
return err;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.