1 files changed, 85 insertions, 262 deletions

diff --git a/net/socket.c b/net/socket.c
index 0b2dad3bdf7f..3c10504e46d9 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -212,6 +212,7 @@ static const char * const pf_family_names[] = {
 	[PF_QIPCRTR]	= "PF_QIPCRTR",
 	[PF_SMC]	= "PF_SMC",
 	[PF_XDP]	= "PF_XDP",
+	[PF_MCTP]	= "PF_MCTP",
 };
 
 /*
@@ -1064,9 +1065,13 @@ static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from)
  */
 
 static DEFINE_MUTEX(br_ioctl_mutex);
-static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
+static int (*br_ioctl_hook)(struct net *net, struct net_bridge *br,
+			    unsigned int cmd, struct ifreq *ifr,
+			    void __user *uarg);
 
-void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
+void brioctl_set(int (*hook)(struct net *net, struct net_bridge *br,
+			     unsigned int cmd, struct ifreq *ifr,
+			     void __user *uarg))
 {
 	mutex_lock(&br_ioctl_mutex);
 	br_ioctl_hook = hook;
@@ -1074,6 +1079,22 @@ void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
 }
 EXPORT_SYMBOL(brioctl_set);
 
+int br_ioctl_call(struct net *net, struct net_bridge *br, unsigned int cmd,
+		  struct ifreq *ifr, void __user *uarg)
+{
+	int err = -ENOPKG;
+
+	if (!br_ioctl_hook)
+		request_module("bridge");
+
+	mutex_lock(&br_ioctl_mutex);
+	if (br_ioctl_hook)
+		err = br_ioctl_hook(net, br, cmd, ifr, uarg);
+	mutex_unlock(&br_ioctl_mutex);
+
+	return err;
+}
+
 static DEFINE_MUTEX(vlan_ioctl_mutex);
 static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
 
@@ -1088,8 +1109,11 @@ EXPORT_SYMBOL(vlan_ioctl_set);
 static long sock_do_ioctl(struct net *net, struct socket *sock,
 			  unsigned int cmd, unsigned long arg)
 {
+	struct ifreq ifr;
+	bool need_copyout;
 	int err;
 	void __user *argp = (void __user *)arg;
+	void __user *data;
 
 	err = sock->ops->ioctl(sock, cmd, arg);
 
@@ -1100,25 +1124,13 @@ static long sock_do_ioctl(struct net *net, struct socket *sock,
 	if (err != -ENOIOCTLCMD)
 		return err;
 
-	if (cmd == SIOCGIFCONF) {
-		struct ifconf ifc;
-		if (copy_from_user(&ifc, argp, sizeof(struct ifconf)))
-			return -EFAULT;
-		rtnl_lock();
-		err = dev_ifconf(net, &ifc, sizeof(struct ifreq));
-		rtnl_unlock();
-		if (!err && copy_to_user(argp, &ifc, sizeof(struct ifconf)))
-			err = -EFAULT;
-	} else {
-		struct ifreq ifr;
-		bool need_copyout;
-		if (copy_from_user(&ifr, argp, sizeof(struct ifreq)))
+	if (get_user_ifreq(&ifr, &data, argp))
+		return -EFAULT;
+	err = dev_ioctl(net, cmd, &ifr, data, &need_copyout);
+	if (!err && need_copyout)
+		if (put_user_ifreq(&ifr, argp))
 			return -EFAULT;
-		err = dev_ioctl(net, cmd, &ifr, &need_copyout);
-		if (!err && need_copyout)
-			if (copy_to_user(argp, &ifr, sizeof(struct ifreq)))
-				return -EFAULT;
-	}
+
 	return err;
 }
 
@@ -1140,12 +1152,13 @@ static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 	net = sock_net(sk);
 	if (unlikely(cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))) {
 		struct ifreq ifr;
+		void __user *data;
 		bool need_copyout;
-		if (copy_from_user(&ifr, argp, sizeof(struct ifreq)))
+		if (get_user_ifreq(&ifr, &data, argp))
 			return -EFAULT;
-		err = dev_ioctl(net, cmd, &ifr, &need_copyout);
+		err = dev_ioctl(net, cmd, &ifr, data, &need_copyout);
 		if (!err && need_copyout)
-			if (copy_to_user(argp, &ifr, sizeof(struct ifreq)))
+			if (put_user_ifreq(&ifr, argp))
 				return -EFAULT;
 	} else
 #ifdef CONFIG_WEXT_CORE
@@ -1170,14 +1183,7 @@ static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 		case SIOCSIFBR:
 		case SIOCBRADDBR:
 		case SIOCBRDELBR:
-			err = -ENOPKG;
-			if (!br_ioctl_hook)
-				request_module("bridge");
-
-			mutex_lock(&br_ioctl_mutex);
-			if (br_ioctl_hook)
-				err = br_ioctl_hook(net, cmd, argp);
-			mutex_unlock(&br_ioctl_mutex);
+			err = br_ioctl_call(net, NULL, cmd, NULL, argp);
 			break;
 		case SIOCGIFVLAN:
 		case SIOCSIFVLAN:
@@ -1217,6 +1223,11 @@ static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 						   cmd == SIOCGSTAMP_NEW,
 						   false);
 			break;
+
+		case SIOCGIFCONF:
+			err = dev_ifconf(net, argp);
+			break;
+
 		default:
 			err = sock_do_ioctl(net, sock, cmd, arg);
 			break;
@@ -3126,154 +3137,55 @@ void socket_seq_show(struct seq_file *seq)
 }
 #endif				/* CONFIG_PROC_FS */
 
-#ifdef CONFIG_COMPAT
-static int compat_dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
+/* Handle the fact that while struct ifreq has the same *layout* on
+ * 32/64 for everything but ifreq::ifru_ifmap and ifreq::ifru_data,
+ * which are handled elsewhere, it still has different *size* due to
+ * ifreq::ifru_ifmap (which is 16 bytes on 32 bit, 24 bytes on 64-bit,
+ * resulting in struct ifreq being 32 and 40 bytes respectively).
+ * As a result, if the struct happens to be at the end of a page and
+ * the next page isn't readable/writable, we get a fault. To prevent
+ * that, copy back and forth to the full size.
+ */
+int get_user_ifreq(struct ifreq *ifr, void __user **ifrdata, void __user *arg)
 {
-	struct compat_ifconf ifc32;
-	struct ifconf ifc;
-	int err;
+	if (in_compat_syscall()) {
+		struct compat_ifreq *ifr32 = (struct compat_ifreq *)ifr;
 
-	if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
-		return -EFAULT;
+		memset(ifr, 0, sizeof(*ifr));
+		if (copy_from_user(ifr32, arg, sizeof(*ifr32)))
+			return -EFAULT;
 
-	ifc.ifc_len = ifc32.ifc_len;
-	ifc.ifc_req = compat_ptr(ifc32.ifcbuf);
+		if (ifrdata)
+			*ifrdata = compat_ptr(ifr32->ifr_data);
 
-	rtnl_lock();
-	err = dev_ifconf(net, &ifc, sizeof(struct compat_ifreq));
-	rtnl_unlock();
-	if (err)
-		return err;
+		return 0;
+	}
 
-	ifc32.ifc_len = ifc.ifc_len;
-	if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
+	if (copy_from_user(ifr, arg, sizeof(*ifr)))
 		return -EFAULT;
 
+	if (ifrdata)
+		*ifrdata = ifr->ifr_data;
+
 	return 0;
 }
+EXPORT_SYMBOL(get_user_ifreq);
 
-static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
+int put_user_ifreq(struct ifreq *ifr, void __user *arg)
 {
-	struct compat_ethtool_rxnfc __user *compat_rxnfc;
-	bool convert_in = false, convert_out = false;
-	size_t buf_size = 0;
-	struct ethtool_rxnfc __user *rxnfc = NULL;
-	struct ifreq ifr;
-	u32 rule_cnt = 0, actual_rule_cnt;
-	u32 ethcmd;
-	u32 data;
-	int ret;
-
-	if (get_user(data, &ifr32->ifr_ifru.ifru_data))
-		return -EFAULT;
-
-	compat_rxnfc = compat_ptr(data);
-
-	if (get_user(ethcmd, &compat_rxnfc->cmd))
-		return -EFAULT;
+	size_t size = sizeof(*ifr);
 
-	/* Most ethtool structures are defined without padding.
-	 * Unfortunately struct ethtool_rxnfc is an exception.
-	 */
-	switch (ethcmd) {
-	default:
-		break;
-	case ETHTOOL_GRXCLSRLALL:
-		/* Buffer size is variable */
-		if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
-			return -EFAULT;
-		if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
-			return -ENOMEM;
-		buf_size += rule_cnt * sizeof(u32);
-		fallthrough;
-	case ETHTOOL_GRXRINGS:
-	case ETHTOOL_GRXCLSRLCNT:
-	case ETHTOOL_GRXCLSRULE:
-	case ETHTOOL_SRXCLSRLINS:
-		convert_out = true;
-		fallthrough;
-	case ETHTOOL_SRXCLSRLDEL:
-		buf_size += sizeof(struct ethtool_rxnfc);
-		convert_in = true;
-		rxnfc = compat_alloc_user_space(buf_size);
-		break;
-	}
+	if (in_compat_syscall())
+		size = sizeof(struct compat_ifreq);
 
-	if (copy_from_user(&ifr.ifr_name, &ifr32->ifr_name, IFNAMSIZ))
+	if (copy_to_user(arg, ifr, size))
 		return -EFAULT;
 
-	ifr.ifr_data = convert_in ? rxnfc : (void __user *)compat_rxnfc;
-
-	if (convert_in) {
-		/* We expect there to be holes between fs.m_ext and
-		 * fs.ring_cookie and at the end of fs, but nowhere else.
-		 */
-		BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
-			     sizeof(compat_rxnfc->fs.m_ext) !=
-			     offsetof(struct ethtool_rxnfc, fs.m_ext) +
-			     sizeof(rxnfc->fs.m_ext));
-		BUILD_BUG_ON(
-			offsetof(struct compat_ethtool_rxnfc, fs.location) -
-			offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
-			offsetof(struct ethtool_rxnfc, fs.location) -
-			offsetof(struct ethtool_rxnfc, fs.ring_cookie));
-
-		if (copy_in_user(rxnfc, compat_rxnfc,
-				 (void __user *)(&rxnfc->fs.m_ext + 1) -
-				 (void __user *)rxnfc) ||
-		    copy_in_user(&rxnfc->fs.ring_cookie,
-				 &compat_rxnfc->fs.ring_cookie,
-				 (void __user *)(&rxnfc->fs.location + 1) -
-				 (void __user *)&rxnfc->fs.ring_cookie))
-			return -EFAULT;
-		if (ethcmd == ETHTOOL_GRXCLSRLALL) {
-			if (put_user(rule_cnt, &rxnfc->rule_cnt))
-				return -EFAULT;
-		} else if (copy_in_user(&rxnfc->rule_cnt,
-					&compat_rxnfc->rule_cnt,
-					sizeof(rxnfc->rule_cnt)))
-			return -EFAULT;
-	}
-
-	ret = dev_ioctl(net, SIOCETHTOOL, &ifr, NULL);
-	if (ret)
-		return ret;
-
-	if (convert_out) {
-		if (copy_in_user(compat_rxnfc, rxnfc,
-				 (const void __user *)(&rxnfc->fs.m_ext + 1) -
-				 (const void __user *)rxnfc) ||
-		    copy_in_user(&compat_rxnfc->fs.ring_cookie,
-				 &rxnfc->fs.ring_cookie,
-				 (const void __user *)(&rxnfc->fs.location + 1) -
-				 (const void __user *)&rxnfc->fs.ring_cookie) ||
-		    copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
-				 sizeof(rxnfc->rule_cnt)))
-			return -EFAULT;
-
-		if (ethcmd == ETHTOOL_GRXCLSRLALL) {
-			/* As an optimisation, we only copy the actual
-			 * number of rules that the underlying
-			 * function returned.  Since Mallory might
-			 * change the rule count in user memory, we
-			 * check that it is less than the rule count
-			 * originally given (as the user buffer size),
-			 * which has been range-checked.
-			 */
-			if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
-				return -EFAULT;
-			if (actual_rule_cnt < rule_cnt)
-				rule_cnt = actual_rule_cnt;
-			if (copy_in_user(&compat_rxnfc->rule_locs[0],
-					 &rxnfc->rule_locs[0],
-					 rule_cnt * sizeof(u32)))
-				return -EFAULT;
-		}
-	}
-
 	return 0;
 }
+EXPORT_SYMBOL(put_user_ifreq);
 
+#ifdef CONFIG_COMPAT
 static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
 {
 	compat_uptr_t uptr32;
@@ -3281,7 +3193,7 @@ static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32
 	void __user *saved;
 	int err;
 
-	if (copy_from_user(&ifr, uifr32, sizeof(struct compat_ifreq)))
+	if (get_user_ifreq(&ifr, NULL, uifr32))
 		return -EFAULT;
 
 	if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
@@ -3290,10 +3202,10 @@ static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32
 	saved = ifr.ifr_settings.ifs_ifsu.raw_hdlc;
 	ifr.ifr_settings.ifs_ifsu.raw_hdlc = compat_ptr(uptr32);
 
-	err = dev_ioctl(net, SIOCWANDEV, &ifr, NULL);
+	err = dev_ioctl(net, SIOCWANDEV, &ifr, NULL, NULL);
 	if (!err) {
 		ifr.ifr_settings.ifs_ifsu.raw_hdlc = saved;
-		if (copy_to_user(uifr32, &ifr, sizeof(struct compat_ifreq)))
+		if (put_user_ifreq(&ifr, uifr32))
 			err = -EFAULT;
 	}
 	return err;
@@ -3304,97 +3216,13 @@ static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd,
 				 struct compat_ifreq __user *u_ifreq32)
 {
 	struct ifreq ifreq;
-	u32 data32;
+	void __user *data;
 
-	if (copy_from_user(ifreq.ifr_name, u_ifreq32->ifr_name, IFNAMSIZ))
-		return -EFAULT;
-	if (get_user(data32, &u_ifreq32->ifr_data))
+	if (get_user_ifreq(&ifreq, &data, u_ifreq32))
 		return -EFAULT;
-	ifreq.ifr_data = compat_ptr(data32);
+	ifreq.ifr_data = data;
 
-	return dev_ioctl(net, cmd, &ifreq, NULL);
-}
-
-static int compat_ifreq_ioctl(struct net *net, struct socket *sock,
-			      unsigned int cmd,
-			      struct compat_ifreq __user *uifr32)
-{
-	struct ifreq __user *uifr;
-	int err;
-
-	/* Handle the fact that while struct ifreq has the same *layout* on
-	 * 32/64 for everything but ifreq::ifru_ifmap and ifreq::ifru_data,
-	 * which are handled elsewhere, it still has different *size* due to
-	 * ifreq::ifru_ifmap (which is 16 bytes on 32 bit, 24 bytes on 64-bit,
-	 * resulting in struct ifreq being 32 and 40 bytes respectively).
-	 * As a result, if the struct happens to be at the end of a page and
-	 * the next page isn't readable/writable, we get a fault. To prevent
-	 * that, copy back and forth to the full size.
-	 */
-
-	uifr = compat_alloc_user_space(sizeof(*uifr));
-	if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
-		return -EFAULT;
-
-	err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
-
-	if (!err) {
-		switch (cmd) {
-		case SIOCGIFFLAGS:
-		case SIOCGIFMETRIC:
-		case SIOCGIFMTU:
-		case SIOCGIFMEM:
-		case SIOCGIFHWADDR:
-		case SIOCGIFINDEX:
-		case SIOCGIFADDR:
-		case SIOCGIFBRDADDR:
-		case SIOCGIFDSTADDR:
-		case SIOCGIFNETMASK:
-		case SIOCGIFPFLAGS:
-		case SIOCGIFTXQLEN:
-		case SIOCGMIIPHY:
-		case SIOCGMIIREG:
-		case SIOCGIFNAME:
-			if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
-				err = -EFAULT;
-			break;
-		}
-	}
-	return err;
-}
-
-static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
-			struct compat_ifreq __user *uifr32)
-{
-	struct ifreq ifr;
-	struct compat_ifmap __user *uifmap32;
-	int err;
-
-	uifmap32 = &uifr32->ifr_ifru.ifru_map;
-	err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
-	err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
-	err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
-	err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
-	err |= get_user(ifr.ifr_map.irq, &uifmap32->irq);
-	err |= get_user(ifr.ifr_map.dma, &uifmap32->dma);
-	err |= get_user(ifr.ifr_map.port, &uifmap32->port);
-	if (err)
-		return -EFAULT;
-
-	err = dev_ioctl(net, cmd, &ifr, NULL);
-
-	if (cmd == SIOCGIFMAP && !err) {
-		err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
-		err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
-		err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
-		err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
-		err |= put_user(ifr.ifr_map.irq, &uifmap32->irq);
-		err |= put_user(ifr.ifr_map.dma, &uifmap32->dma);
-		err |= put_user(ifr.ifr_map.port, &uifmap32->port);
-		if (err)
-			err = -EFAULT;
-	}
-	return err;
+	return dev_ioctl(net, cmd, &ifreq, data, NULL);
 }
 
 /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
@@ -3420,21 +3248,14 @@ static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
 	struct net *net = sock_net(sk);
 
 	if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
-		return compat_ifr_data_ioctl(net, cmd, argp);
+		return sock_ioctl(file, cmd, (unsigned long)argp);
 
 	switch (cmd) {
 	case SIOCSIFBR:
 	case SIOCGIFBR:
 		return old_bridge_ioctl(argp);
-	case SIOCGIFCONF:
-		return compat_dev_ifconf(net, argp);
-	case SIOCETHTOOL:
-		return ethtool_ioctl(net, argp);
 	case SIOCWANDEV:
 		return compat_siocwandev(net, argp);
-	case SIOCGIFMAP:
-	case SIOCSIFMAP:
-		return compat_sioc_ifmap(net, cmd, argp);
 	case SIOCGSTAMP_OLD:
 	case SIOCGSTAMPNS_OLD:
 		if (!sock->ops->gettstamp)
@@ -3442,6 +3263,7 @@ static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
 		return sock->ops->gettstamp(sock, argp, cmd == SIOCGSTAMP_OLD,
 					    !COMPAT_USE_64BIT_TIME);
 
+	case SIOCETHTOOL:
 	case SIOCBONDSLAVEINFOQUERY:
 	case SIOCBONDINFOQUERY:
 	case SIOCSHWTSTAMP:
@@ -3459,10 +3281,13 @@ static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
 	case SIOCGSKNS:
 	case SIOCGSTAMP_NEW:
 	case SIOCGSTAMPNS_NEW:
+	case SIOCGIFCONF:
 		return sock_ioctl(file, cmd, arg);
 
 	case SIOCGIFFLAGS:
 	case SIOCSIFFLAGS:
+	case SIOCGIFMAP:
+	case SIOCSIFMAP:
 	case SIOCGIFMETRIC:
 	case SIOCSIFMETRIC:
 	case SIOCGIFMTU:
@@ -3499,8 +3324,6 @@ static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
 	case SIOCBONDRELEASE:
 	case SIOCBONDSETHWADDR:
 	case SIOCBONDCHANGEACTIVE:
-		return compat_ifreq_ioctl(net, sock, cmd, argp);
-
 	case SIOCSARP:
 	case SIOCGARP:
 	case SIOCDARP: