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authorOliver Hartkopp <socketcan@hartkopp.net>2021-03-25 13:58:48 +0100
committerMarc Kleine-Budde <mkl@pengutronix.de>2021-03-29 09:51:20 +0200
commit9e9714742fb70467464359693a73b911a630226f (patch)
tree01fb923d7e2428470d8abf9a1e4e6b1ff47f9f86 /net/can
parent1b479fb801602b22512f53c19b1f93a4fc5d5d9d (diff)
downloadlinux-9e9714742fb70467464359693a73b911a630226f.tar.bz2
can: bcm/raw: fix msg_namelen values depending on CAN_REQUIRED_SIZE
Since commit f5223e9eee65 ("can: extend sockaddr_can to include j1939 members") the sockaddr_can has been extended in size and a new CAN_REQUIRED_SIZE macro has been introduced to calculate the protocol specific needed size. The ABI for the msg_name and msg_namelen has not been adapted to the new CAN_REQUIRED_SIZE macro for the other CAN protocols which leads to a problem when an existing binary reads the (increased) struct sockaddr_can in msg_name. Fixes: f5223e9eee65 ("can: extend sockaddr_can to include j1939 members") Reported-by: Richard Weinberger <richard@nod.at> Tested-by: Richard Weinberger <richard@nod.at> Acked-by: Kurt Van Dijck <dev.kurt@vandijck-laurijssen.be> Link: https://lore.kernel.org/linux-can/1135648123.112255.1616613706554.JavaMail.zimbra@nod.at/T/#t Link: https://lore.kernel.org/r/20210325125850.1620-1-socketcan@hartkopp.net Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'net/can')
-rw-r--r--net/can/bcm.c10
-rw-r--r--net/can/raw.c14
2 files changed, 14 insertions, 10 deletions
diff --git a/net/can/bcm.c b/net/can/bcm.c
index 0e5c37be4a2b..909b9e684e04 100644
--- a/net/can/bcm.c
+++ b/net/can/bcm.c
@@ -86,6 +86,8 @@ MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
MODULE_ALIAS("can-proto-2");
+#define BCM_MIN_NAMELEN CAN_REQUIRED_SIZE(struct sockaddr_can, can_ifindex)
+
/*
* easy access to the first 64 bit of can(fd)_frame payload. cp->data is
* 64 bit aligned so the offset has to be multiples of 8 which is ensured
@@ -1292,7 +1294,7 @@ static int bcm_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
/* no bound device as default => check msg_name */
DECLARE_SOCKADDR(struct sockaddr_can *, addr, msg->msg_name);
- if (msg->msg_namelen < CAN_REQUIRED_SIZE(*addr, can_ifindex))
+ if (msg->msg_namelen < BCM_MIN_NAMELEN)
return -EINVAL;
if (addr->can_family != AF_CAN)
@@ -1534,7 +1536,7 @@ static int bcm_connect(struct socket *sock, struct sockaddr *uaddr, int len,
struct net *net = sock_net(sk);
int ret = 0;
- if (len < CAN_REQUIRED_SIZE(*addr, can_ifindex))
+ if (len < BCM_MIN_NAMELEN)
return -EINVAL;
lock_sock(sk);
@@ -1616,8 +1618,8 @@ static int bcm_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
sock_recv_ts_and_drops(msg, sk, skb);
if (msg->msg_name) {
- __sockaddr_check_size(sizeof(struct sockaddr_can));
- msg->msg_namelen = sizeof(struct sockaddr_can);
+ __sockaddr_check_size(BCM_MIN_NAMELEN);
+ msg->msg_namelen = BCM_MIN_NAMELEN;
memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
}
diff --git a/net/can/raw.c b/net/can/raw.c
index 37b47a39a3ed..139d9471ddcf 100644
--- a/net/can/raw.c
+++ b/net/can/raw.c
@@ -60,6 +60,8 @@ MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Urs Thuermann <urs.thuermann@volkswagen.de>");
MODULE_ALIAS("can-proto-1");
+#define RAW_MIN_NAMELEN CAN_REQUIRED_SIZE(struct sockaddr_can, can_ifindex)
+
#define MASK_ALL 0
/* A raw socket has a list of can_filters attached to it, each receiving
@@ -394,7 +396,7 @@ static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len)
int err = 0;
int notify_enetdown = 0;
- if (len < CAN_REQUIRED_SIZE(*addr, can_ifindex))
+ if (len < RAW_MIN_NAMELEN)
return -EINVAL;
if (addr->can_family != AF_CAN)
return -EINVAL;
@@ -475,11 +477,11 @@ static int raw_getname(struct socket *sock, struct sockaddr *uaddr,
if (peer)
return -EOPNOTSUPP;
- memset(addr, 0, sizeof(*addr));
+ memset(addr, 0, RAW_MIN_NAMELEN);
addr->can_family = AF_CAN;
addr->can_ifindex = ro->ifindex;
- return sizeof(*addr);
+ return RAW_MIN_NAMELEN;
}
static int raw_setsockopt(struct socket *sock, int level, int optname,
@@ -739,7 +741,7 @@ static int raw_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
if (msg->msg_name) {
DECLARE_SOCKADDR(struct sockaddr_can *, addr, msg->msg_name);
- if (msg->msg_namelen < CAN_REQUIRED_SIZE(*addr, can_ifindex))
+ if (msg->msg_namelen < RAW_MIN_NAMELEN)
return -EINVAL;
if (addr->can_family != AF_CAN)
@@ -832,8 +834,8 @@ static int raw_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
sock_recv_ts_and_drops(msg, sk, skb);
if (msg->msg_name) {
- __sockaddr_check_size(sizeof(struct sockaddr_can));
- msg->msg_namelen = sizeof(struct sockaddr_can);
+ __sockaddr_check_size(RAW_MIN_NAMELEN);
+ msg->msg_namelen = RAW_MIN_NAMELEN;
memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
}