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net/ieee802154: fix uninit value bug in dgram_sendmsg

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There is uninit value bug in dgram_sendmsg function in
net/ieee802154/socket.c when the length of valid data pointed by the
msg->msg_name isn't verified.

We introducing a helper function ieee802154_sockaddr_check_size to
check namelen. First we check there is addr_type in ieee802154_addr_sa.
Then, we check namelen according to addr_type.

Also fixed in raw_bind, dgram_bind, dgram_connect.

Signed-off-by: Haimin Zhang <tcs_kernel@tencent.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Haimin Zhang 2022-09-08 20:19:27 +08:00 committed by David S. Miller
parent 0727a9a5fb
commit 94160108a7
2 changed files with 60 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
include/net/ieee802154_netdev.h
View File

@ -15,6 +15,22 @@
#ifndef IEEE802154_NETDEVICE_H
#define IEEE802154_NETDEVICE_H
#define IEEE802154_REQUIRED_SIZE(struct_type, member) \
(offsetof(typeof(struct_type), member) + \
sizeof(((typeof(struct_type) *)(NULL))->member))
#define IEEE802154_ADDR_OFFSET \
offsetof(typeof(struct sockaddr_ieee802154), addr)
#define IEEE802154_MIN_NAMELEN (IEEE802154_ADDR_OFFSET + \
IEEE802154_REQUIRED_SIZE(struct ieee802154_addr_sa, addr_type))
#define IEEE802154_NAMELEN_SHORT (IEEE802154_ADDR_OFFSET + \
IEEE802154_REQUIRED_SIZE(struct ieee802154_addr_sa, short_addr))
#define IEEE802154_NAMELEN_LONG (IEEE802154_ADDR_OFFSET + \
IEEE802154_REQUIRED_SIZE(struct ieee802154_addr_sa, hwaddr))
#include <net/af_ieee802154.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
@ -165,6 +181,27 @@ static inline void ieee802154_devaddr_to_raw(void *raw, __le64 addr)
memcpy(raw, &temp, IEEE802154_ADDR_LEN);
}
static inline int
ieee802154_sockaddr_check_size(struct sockaddr_ieee802154 *daddr, int len)
{
struct ieee802154_addr_sa *sa;
sa = &daddr->addr;
if (len < IEEE802154_MIN_NAMELEN)
return -EINVAL;
switch (sa->addr_type) {
case IEEE802154_ADDR_SHORT:
if (len < IEEE802154_NAMELEN_SHORT)
return -EINVAL;
break;
case IEEE802154_ADDR_LONG:
if (len < IEEE802154_NAMELEN_LONG)
return -EINVAL;
break;
}
return 0;
}
static inline void ieee802154_addr_from_sa(struct ieee802154_addr *a,
const struct ieee802154_addr_sa *sa)
{

42
net/ieee802154/socket.c
View File

@ -200,8 +200,9 @@ static int raw_bind(struct sock *sk, struct sockaddr *_uaddr, int len)
int err = 0;
struct net_device *dev = NULL;
if (len < sizeof(*uaddr))
return -EINVAL;
err = ieee802154_sockaddr_check_size(uaddr, len);
if (err < 0)
return err;
uaddr = (struct sockaddr_ieee802154 *)_uaddr;
if (uaddr->family != AF_IEEE802154)
@ -493,7 +494,8 @@ static int dgram_bind(struct sock *sk, struct sockaddr *uaddr, int len)
ro->bound = 0;
if (len < sizeof(*addr))
err = ieee802154_sockaddr_check_size(addr, len);
if (err < 0)
goto out;
if (addr->family != AF_IEEE802154)
@ -564,8 +566,9 @@ static int dgram_connect(struct sock *sk, struct sockaddr *uaddr,
struct dgram_sock *ro = dgram_sk(sk);
int err = 0;
if (len < sizeof(*addr))
return -EINVAL;
err = ieee802154_sockaddr_check_size(addr, len);
if (err < 0)
return err;
if (addr->family != AF_IEEE802154)
return -EINVAL;
@ -604,6 +607,7 @@ static int dgram_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
struct ieee802154_mac_cb *cb;
struct dgram_sock *ro = dgram_sk(sk);
struct ieee802154_addr dst_addr;
DECLARE_SOCKADDR(struct sockaddr_ieee802154*, daddr, msg->msg_name);
int hlen, tlen;
int err;
@ -612,10 +616,20 @@ static int dgram_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
return -EOPNOTSUPP;
}
if (!ro->connected && !msg->msg_name)
return -EDESTADDRREQ;
else if (ro->connected && msg->msg_name)
return -EISCONN;
if (msg->msg_name) {
if (ro->connected)
return -EISCONN;
if (msg->msg_namelen < IEEE802154_MIN_NAMELEN)
return -EINVAL;
err = ieee802154_sockaddr_check_size(daddr, msg->msg_namelen);
if (err < 0)
return err;
ieee802154_addr_from_sa(&dst_addr, &daddr->addr);
} else {
if (!ro->connected)
return -EDESTADDRREQ;
dst_addr = ro->dst_addr;
}
if (!ro->bound)
dev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_IEEE802154);
@ -651,16 +665,6 @@ static int dgram_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
cb = mac_cb_init(skb);
cb->type = IEEE802154_FC_TYPE_DATA;
cb->ackreq = ro->want_ack;
if (msg->msg_name) {
DECLARE_SOCKADDR(struct sockaddr_ieee802154*,
daddr, msg->msg_name);
ieee802154_addr_from_sa(&dst_addr, &daddr->addr);
} else {
dst_addr = ro->dst_addr;
}
cb->secen = ro->secen;
cb->secen_override = ro->secen_override;
cb->seclevel = ro->seclevel;