Merge branch 'net-remove-compat-alloc-user-space'

Arnd Bergmann says:

====================
remove compat_alloc_user_space()

This is the fifth version of my series, now spanning four patches
instead of two, with a new approach for handling struct ifreq
compatibility after I realized that my earlier approach introduces
additional problems.

The idea here is to always push down the compat conversion
deeper into the call stack: rather than pretending to be
native mode with a modified copy of the original data on
the user space stack, have the code that actually works on
the data understand the difference between native and compat
versions.

I have spent a long time looking at all drivers that implement
an ndo_do_ioctl callback to verify that my assumptions are
correct. This has led to a series of ~30 additional patches
that I am not including here but will post separately, fixing
a number of bugs in SIOCDEVPRIVATE ioctls, removing dead
code, and splitting ndo_do_ioctl into multiple new ndo callbacks
for private and ethernet specific commands.

      Arnd

Link: https://lore.kernel.org/netdev/20201124151828.169152-1-arnd@kernel.org/

Changes in v6:
 - Split out and expand linux/compat.h rework
 - Split ifconf change into two patches
 - Rebase on latest net-next/master

Changes in v5:
 - Rebase to v5.14-rc2
 - Fix a few build issues

Changes in v4:
 - build fix without CONFIG_INET
 - build fix without CONFIG_COMPAT
 - style fixes pointed out by hch

Changes in v3:
 - complete rewrite of the series
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/arm64/include/asm/compat.h

@@ -5,6 +5,9 @@
 #ifndef __ASM_COMPAT_H
 #define __ASM_COMPAT_H
 
+#define compat_mode_t compat_mode_t
+typedef u16		compat_mode_t;
+
 #include <asm-generic/compat.h>
 
 #ifdef CONFIG_COMPAT
@@ -27,13 +30,9 @@ typedef u16		__compat_uid_t;
 typedef u16		__compat_gid_t;
 typedef u16		__compat_uid16_t;
 typedef u16		__compat_gid16_t;
-typedef u32		__compat_uid32_t;
-typedef u32		__compat_gid32_t;
-typedef u16		compat_mode_t;
 typedef u32		compat_dev_t;
 typedef s32		compat_nlink_t;
 typedef u16		compat_ipc_pid_t;
-typedef u32		compat_caddr_t;
 typedef __kernel_fsid_t	compat_fsid_t;
 
 struct compat_stat {
@@ -103,13 +102,6 @@ struct compat_statfs {
 
 #define COMPAT_RLIM_INFINITY		0xffffffff
 
-typedef u32		compat_old_sigset_t;
-
-#define _COMPAT_NSIG		64
-#define _COMPAT_NSIG_BPW	32
-
-typedef u32		compat_sigset_word;
-
 #define COMPAT_OFF_T_MAX	0x7fffffff
 
 #define compat_user_stack_pointer() (user_stack_pointer(task_pt_regs(current)))

arch/mips/include/asm/compat.h

@@ -9,20 +9,25 @@
 #include <asm/page.h>
 #include <asm/ptrace.h>
 
+typedef s32		__compat_uid_t;
+typedef s32		__compat_gid_t;
+typedef __compat_uid_t	__compat_uid32_t;
+typedef __compat_gid_t	__compat_gid32_t;
+#define __compat_uid32_t __compat_uid32_t
+#define __compat_gid32_t __compat_gid32_t
+
+#define _COMPAT_NSIG		128		/* Don't ask !$@#% ...	*/
+#define _COMPAT_NSIG_BPW	32
+typedef u32		compat_sigset_word;
+
 #include <asm-generic/compat.h>
 
 #define COMPAT_USER_HZ		100
 #define COMPAT_UTS_MACHINE	"mips\0\0\0"
 
-typedef s32		__compat_uid_t;
-typedef s32		__compat_gid_t;
-typedef __compat_uid_t	__compat_uid32_t;
-typedef __compat_gid_t	__compat_gid32_t;
-typedef u32		compat_mode_t;
 typedef u32		compat_dev_t;
 typedef u32		compat_nlink_t;
 typedef s32		compat_ipc_pid_t;
-typedef s32		compat_caddr_t;
 typedef struct {
 	s32	val[2];
 } compat_fsid_t;
@@ -89,13 +94,6 @@ struct compat_statfs {
 
 #define COMPAT_RLIM_INFINITY	0x7fffffffUL
 
-typedef u32		compat_old_sigset_t;	/* at least 32 bits */
-
-#define _COMPAT_NSIG		128		/* Don't ask !$@#% ...	*/
-#define _COMPAT_NSIG_BPW	32
-
-typedef u32		compat_sigset_word;
-
 #define COMPAT_OFF_T_MAX	0x7fffffff
 
 static inline void __user *arch_compat_alloc_user_space(long len)

arch/parisc/include/asm/compat.h

@@ -8,6 +8,9 @@
 #include <linux/sched.h>
 #include <linux/thread_info.h>
 
+#define compat_mode_t compat_mode_t
+typedef u16	compat_mode_t;
+
 #include <asm-generic/compat.h>
 
 #define COMPAT_USER_HZ 		100
@@ -15,13 +18,9 @@
 
 typedef u32	__compat_uid_t;
 typedef u32	__compat_gid_t;
-typedef u32	__compat_uid32_t;
-typedef u32	__compat_gid32_t;
-typedef u16	compat_mode_t;
 typedef u32	compat_dev_t;
 typedef u16	compat_nlink_t;
 typedef u16	compat_ipc_pid_t;
-typedef u32	compat_caddr_t;
 
 struct compat_stat {
 	compat_dev_t		st_dev;	/* dev_t is 32 bits on parisc */
@@ -96,13 +95,6 @@ struct compat_sigcontext {
 
 #define COMPAT_RLIM_INFINITY 0xffffffff
 
-typedef u32		compat_old_sigset_t;	/* at least 32 bits */
-
-#define _COMPAT_NSIG		64
-#define _COMPAT_NSIG_BPW	32
-
-typedef u32		compat_sigset_word;
-
 #define COMPAT_OFF_T_MAX	0x7fffffff
 
 struct compat_ipc64_perm {

arch/powerpc/include/asm/compat.h

@@ -19,13 +19,9 @@
 
 typedef u32		__compat_uid_t;
 typedef u32		__compat_gid_t;
-typedef u32		__compat_uid32_t;
-typedef u32		__compat_gid32_t;
-typedef u32		compat_mode_t;
 typedef u32		compat_dev_t;
 typedef s16		compat_nlink_t;
 typedef u16		compat_ipc_pid_t;
-typedef u32		compat_caddr_t;
 typedef __kernel_fsid_t	compat_fsid_t;
 
 struct compat_stat {
@@ -85,13 +81,6 @@ struct compat_statfs {
 
 #define COMPAT_RLIM_INFINITY		0xffffffff
 
-typedef u32		compat_old_sigset_t;
-
-#define _COMPAT_NSIG		64
-#define _COMPAT_NSIG_BPW	32
-
-typedef u32		compat_sigset_word;
-
 #define COMPAT_OFF_T_MAX	0x7fffffff
 
 static inline void __user *arch_compat_alloc_user_space(long len)

arch/s390/include/asm/compat.h

@@ -9,6 +9,9 @@
 #include <linux/sched/task_stack.h>
 #include <linux/thread_info.h>
 
+#define compat_mode_t	compat_mode_t
+typedef u16		compat_mode_t;
+
 #include <asm-generic/compat.h>
 
 #define __TYPE_IS_PTR(t) (!__builtin_types_compatible_p( \
@@ -55,13 +58,9 @@
 
 typedef u16		__compat_uid_t;
 typedef u16		__compat_gid_t;
-typedef u32		__compat_uid32_t;
-typedef u32		__compat_gid32_t;
-typedef u16		compat_mode_t;
 typedef u16		compat_dev_t;
 typedef u16		compat_nlink_t;
 typedef u16		compat_ipc_pid_t;
-typedef u32		compat_caddr_t;
 typedef __kernel_fsid_t	compat_fsid_t;
 
 typedef struct {
@@ -155,13 +154,6 @@ struct compat_statfs64 {
 
 #define COMPAT_RLIM_INFINITY		0xffffffff
 
-typedef u32		compat_old_sigset_t;	/* at least 32 bits */
-
-#define _COMPAT_NSIG		64
-#define _COMPAT_NSIG_BPW	32
-
-typedef u32		compat_sigset_word;
-
 #define COMPAT_OFF_T_MAX	0x7fffffff
 
 /*

arch/sparc/include/asm/compat.h

@@ -6,6 +6,9 @@
  */
 #include <linux/types.h>
 
+#define compat_mode_t	compat_mode_t
+typedef u16		compat_mode_t;
+
 #include <asm-generic/compat.h>
 
 #define COMPAT_USER_HZ		100
@@ -13,13 +16,9 @@
 
 typedef u16		__compat_uid_t;
 typedef u16		__compat_gid_t;
-typedef u32		__compat_uid32_t;
-typedef u32		__compat_gid32_t;
-typedef u16		compat_mode_t;
 typedef u16		compat_dev_t;
 typedef s16		compat_nlink_t;
 typedef u16		compat_ipc_pid_t;
-typedef u32		compat_caddr_t;
 typedef __kernel_fsid_t	compat_fsid_t;
 
 struct compat_stat {
@@ -115,13 +114,6 @@ struct compat_statfs {
 
 #define COMPAT_RLIM_INFINITY 0x7fffffff
 
-typedef u32		compat_old_sigset_t;
-
-#define _COMPAT_NSIG		64
-#define _COMPAT_NSIG_BPW	32
-
-typedef u32		compat_sigset_word;
-
 #define COMPAT_OFF_T_MAX	0x7fffffff
 
 #ifdef CONFIG_COMPAT

arch/x86/include/asm/compat.h

@@ -12,6 +12,9 @@
 #include <asm/user32.h>
 #include <asm/unistd.h>
 
+#define compat_mode_t	compat_mode_t
+typedef u16		compat_mode_t;
+
 #include <asm-generic/compat.h>
 
 #define COMPAT_USER_HZ		100
@@ -19,13 +22,9 @@
 
 typedef u16		__compat_uid_t;
 typedef u16		__compat_gid_t;
-typedef u32		__compat_uid32_t;
-typedef u32		__compat_gid32_t;
-typedef u16		compat_mode_t;
 typedef u16		compat_dev_t;
 typedef u16		compat_nlink_t;
 typedef u16		compat_ipc_pid_t;
-typedef u32		compat_caddr_t;
 typedef __kernel_fsid_t	compat_fsid_t;
 
 struct compat_stat {
@@ -92,13 +91,6 @@ struct compat_statfs {
 
 #define COMPAT_RLIM_INFINITY		0xffffffff
 
-typedef u32		compat_old_sigset_t;	/* at least 32 bits */
-
-#define _COMPAT_NSIG		64
-#define _COMPAT_NSIG_BPW	32
-
-typedef u32               compat_sigset_word;
-
 #define COMPAT_OFF_T_MAX	0x7fffffff
 
 struct compat_ipc64_perm {

arch/x86/include/asm/signal.h

@@ -29,6 +29,7 @@ typedef struct {
 #define SA_X32_ABI	0x01000000u
 
 #ifndef CONFIG_COMPAT
+#define compat_sigset_t compat_sigset_t
 typedef sigset_t compat_sigset_t;
 #endif
 

include/asm-generic/compat.h

@@ -20,7 +20,18 @@ typedef u16 compat_ushort_t;
 typedef u32 compat_uint_t;
 typedef u32 compat_ulong_t;
 typedef u32 compat_uptr_t;
+typedef u32 compat_caddr_t;
 typedef u32 compat_aio_context_t;
+typedef u32 compat_old_sigset_t;
+
+#ifndef __compat_uid32_t
+typedef u32 __compat_uid32_t;
+typedef u32 __compat_gid32_t;
+#endif
+
+#ifndef compat_mode_t
+typedef u32 compat_mode_t;
+#endif
 
 #ifdef CONFIG_COMPAT_FOR_U64_ALIGNMENT
 typedef s64 __attribute__((aligned(4))) compat_s64;
@@ -30,4 +41,10 @@ typedef s64 compat_s64;
 typedef u64 compat_u64;
 #endif
 
+#ifndef _COMPAT_NSIG
+typedef u32 compat_sigset_word;
+#define _COMPAT_NSIG _NSIG
+#define _COMPAT_NSIG_BPW 32
+#endif
+
 #endif

include/linux/compat.h

@@ -20,11 +20,8 @@
 #include <linux/unistd.h>
 
 #include <asm/compat.h>
-
-#ifdef CONFIG_COMPAT
 #include <asm/siginfo.h>
 #include <asm/signal.h>
-#endif
 
 #ifdef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
 /*
@@ -95,8 +92,6 @@ struct compat_iovec {
 	compat_size_t	iov_len;
 };
 
-#ifdef CONFIG_COMPAT
-
 #ifndef compat_user_stack_pointer
 #define compat_user_stack_pointer() current_user_stack_pointer()
 #endif
@@ -131,9 +126,11 @@ struct compat_tms {
 
 #define _COMPAT_NSIG_WORDS	(_COMPAT_NSIG / _COMPAT_NSIG_BPW)
 
+#ifndef compat_sigset_t
 typedef struct {
 	compat_sigset_word	sig[_COMPAT_NSIG_WORDS];
 } compat_sigset_t;
+#endif
 
 int set_compat_user_sigmask(const compat_sigset_t __user *umask,
 			    size_t sigsetsize);
@@ -384,6 +381,7 @@ struct compat_keyctl_kdf_params {
 	__u32 __spare[8];
 };
 
+struct compat_stat;
 struct compat_statfs;
 struct compat_statfs64;
 struct compat_old_linux_dirent;
@@ -428,7 +426,7 @@ put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set,
 		  unsigned int size)
 {
 	/* size <= sizeof(compat_sigset_t) <= sizeof(sigset_t) */
-#ifdef __BIG_ENDIAN
+#if defined(__BIG_ENDIAN) && defined(CONFIG_64BIT)
 	compat_sigset_t v;
 	switch (_NSIG_WORDS) {
 	case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
@@ -929,17 +927,6 @@ asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
 
 #endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
 
-
-/*
- * For most but not all architectures, "am I in a compat syscall?" and
- * "am I a compat task?" are the same question.  For architectures on which
- * they aren't the same question, arch code can override in_compat_syscall.
- */
-
-#ifndef in_compat_syscall
-static inline bool in_compat_syscall(void) { return is_compat_task(); }
-#endif
-
 /**
  * ns_to_old_timeval32 - Compat version of ns_to_timeval
  * @nsec:	the nanoseconds value to be converted
@@ -969,6 +956,17 @@ int kcompat_sys_statfs64(const char __user * pathname, compat_size_t sz,
 int kcompat_sys_fstatfs64(unsigned int fd, compat_size_t sz,
 			  struct compat_statfs64 __user * buf);
 
+#ifdef CONFIG_COMPAT
+
+/*
+ * For most but not all architectures, "am I in a compat syscall?" and
+ * "am I a compat task?" are the same question.  For architectures on which
+ * they aren't the same question, arch code can override in_compat_syscall.
+ */
+#ifndef in_compat_syscall
+static inline bool in_compat_syscall(void) { return is_compat_task(); }
+#endif
+
 #else /* !CONFIG_COMPAT */
 
 #define is_compat_task() (0)

include/linux/ethtool.h

@@ -17,8 +17,6 @@
 #include <linux/compat.h>
 #include <uapi/linux/ethtool.h>
 
-#ifdef CONFIG_COMPAT
-
 struct compat_ethtool_rx_flow_spec {
 	u32		flow_type;
 	union ethtool_flow_union h_u;
@@ -38,8 +36,6 @@ struct compat_ethtool_rxnfc {
 	u32				rule_locs[];
 };
 
-#endif /* CONFIG_COMPAT */
-
 #include <linux/rculist.h>
 
 /**

include/linux/inetdevice.h

@@ -178,6 +178,15 @@ static inline struct net_device *ip_dev_find(struct net *net, __be32 addr)
 
 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
 int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *);
+#ifdef CONFIG_INET
+int inet_gifconf(struct net_device *dev, char __user *buf, int len, int size);
+#else
+static inline int inet_gifconf(struct net_device *dev, char __user *buf,
+			       int len, int size)
+{
+	return 0;
+}
+#endif
 void devinet_init(void);
 struct in_device *inetdev_by_index(struct net *, int);
 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope);

include/linux/netdevice.h

@@ -3289,14 +3289,6 @@ static inline bool dev_has_header(const struct net_device *dev)
 	return dev->header_ops && dev->header_ops->create;
 }
 
-typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr,
-			   int len, int size);
-int register_gifconf(unsigned int family, gifconf_func_t *gifconf);
-static inline int unregister_gifconf(unsigned int family)
-{
-	return register_gifconf(family, NULL);
-}
-
 #ifdef CONFIG_NET_FLOW_LIMIT
 #define FLOW_LIMIT_HISTORY	(1 << 7)  /* must be ^2 and !overflow buckets */
 struct sd_flow_limit {
@@ -4014,9 +4006,11 @@ int netdev_rx_handler_register(struct net_device *dev,
 void netdev_rx_handler_unregister(struct net_device *dev);
 
 bool dev_valid_name(const char *name);
+int get_user_ifreq(struct ifreq *ifr, void __user **ifrdata, void __user *arg);
+int put_user_ifreq(struct ifreq *ifr, void __user *arg);
 int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr,
 		bool *need_copyout);
-int dev_ifconf(struct net *net, struct ifconf *, int);
+int dev_ifconf(struct net *net, struct ifconf __user *ifc);
 int dev_ethtool(struct net *net, struct ifreq *);
 unsigned int dev_get_flags(const struct net_device *);
 int __dev_change_flags(struct net_device *dev, unsigned int flags,

net/appletalk/ddp.c

@@ -666,7 +666,7 @@ static int atif_ioctl(int cmd, void __user *arg)
 	struct rtentry rtdef;
 	int add_route;
 
-	if (copy_from_user(&atreq, arg, sizeof(atreq)))
+	if (get_user_ifreq(&atreq, NULL, arg))
 		return -EFAULT;
 
 	dev = __dev_get_by_name(&init_net, atreq.ifr_name);
@@ -865,7 +865,7 @@ static int atif_ioctl(int cmd, void __user *arg)
 		return 0;
 	}
 
-	return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0;
+	return put_user_ifreq(&atreq, arg);
 }
 
 static int atrtr_ioctl_addrt(struct rtentry *rt)

net/core/dev_ioctl.c

 // SPDX-License-Identifier: GPL-2.0
 #include <linux/kmod.h>
 #include <linux/netdevice.h>
+#include <linux/inetdevice.h>
 #include <linux/etherdevice.h>
 #include <linux/rtnetlink.h>
 #include <linux/net_tstamp.h>
@@ -25,79 +26,108 @@ static int dev_ifname(struct net *net, struct ifreq *ifr)
 	return netdev_get_name(net, ifr->ifr_name, ifr->ifr_ifindex);
 }
 
-static gifconf_func_t *gifconf_list[NPROTO];
-
-/**
- *	register_gifconf	-	register a SIOCGIF handler
- *	@family: Address family
- *	@gifconf: Function handler
- *
- *	Register protocol dependent address dumping routines. The handler
- *	that is passed must not be freed or reused until it has been replaced
- *	by another handler.
- */
-int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
-{
-	if (family >= NPROTO)
-		return -EINVAL;
-	gifconf_list[family] = gifconf;
-	return 0;
-}
-EXPORT_SYMBOL(register_gifconf);
-
 /*
  *	Perform a SIOCGIFCONF call. This structure will change
  *	size eventually, and there is nothing I can do about it.
  *	Thus we will need a 'compatibility mode'.
  */
-
-int dev_ifconf(struct net *net, struct ifconf *ifc, int size)
+int dev_ifconf(struct net *net, struct ifconf __user *uifc)
 {
 	struct net_device *dev;
-	char __user *pos;
-	int len;
-	int total;
-	int i;
+	void __user *pos;
+	size_t size;
+	int len, total = 0, done;
 
-	/*
-	 *	Fetch the caller's info block.
-	 */
+	/* both the ifconf and the ifreq structures are slightly different */
+	if (in_compat_syscall()) {
+		struct compat_ifconf ifc32;
 
-	pos = ifc->ifc_buf;
-	len = ifc->ifc_len;
+		if (copy_from_user(&ifc32, uifc, sizeof(struct compat_ifconf)))
+			return -EFAULT;
 
-	/*
-	 *	Loop over the interfaces, and write an info block for each.
-	 */
+		pos = compat_ptr(ifc32.ifcbuf);
+		len = ifc32.ifc_len;
+		size = sizeof(struct compat_ifreq);
+	} else {
+		struct ifconf ifc;
+
+		if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
+			return -EFAULT;
+
+		pos = ifc.ifc_buf;
+		len = ifc.ifc_len;
+		size = sizeof(struct ifreq);
+	}
 
-	total = 0;
+	/* Loop over the interfaces, and write an info block for each. */
+	rtnl_lock();
 	for_each_netdev(net, dev) {
-		for (i = 0; i < NPROTO; i++) {
-			if (gifconf_list[i]) {
-				int done;
-				if (!pos)
-					done = gifconf_list[i](dev, NULL, 0, size);
-				else
-					done = gifconf_list[i](dev, pos + total,
-							       len - total, size);
-				if (done < 0)
-					return -EFAULT;
-				total += done;
-			}
+		if (!pos)
+			done = inet_gifconf(dev, NULL, 0, size);
+		else
+			done = inet_gifconf(dev, pos + total,
+					    len - total, size);
+		if (done < 0) {
+			rtnl_unlock();
+			return -EFAULT;
 		}
+		total += done;
 	}
+	rtnl_unlock();
 
-	/*
-	 *	All done.  Write the updated control block back to the caller.
-	 */
-	ifc->ifc_len = total;
+	return put_user(total, &uifc->ifc_len);
+}
+
+static int dev_getifmap(struct net_device *dev, struct ifreq *ifr)
+{
+	struct ifmap *ifmap = &ifr->ifr_map;
+
+	if (in_compat_syscall()) {
+		struct compat_ifmap *cifmap = (struct compat_ifmap *)ifmap;
+
+		cifmap->mem_start = dev->mem_start;
+		cifmap->mem_end   = dev->mem_end;
+		cifmap->base_addr = dev->base_addr;
+		cifmap->irq       = dev->irq;
+		cifmap->dma       = dev->dma;
+		cifmap->port      = dev->if_port;
+
+		return 0;
+	}
+
+	ifmap->mem_start  = dev->mem_start;
+	ifmap->mem_end    = dev->mem_end;
+	ifmap->base_addr  = dev->base_addr;
+	ifmap->irq        = dev->irq;
+	ifmap->dma        = dev->dma;
+	ifmap->port       = dev->if_port;
 
-	/*
-	 * 	Both BSD and Solaris return 0 here, so we do too.
-	 */
 	return 0;
 }
 
+static int dev_setifmap(struct net_device *dev, struct ifreq *ifr)
+{
+	struct compat_ifmap *cifmap = (struct compat_ifmap *)&ifr->ifr_map;
+
+	if (!dev->netdev_ops->ndo_set_config)
+		return -EOPNOTSUPP;
+
+	if (in_compat_syscall()) {
+		struct ifmap ifmap = {
+			.mem_start  = cifmap->mem_start,
+			.mem_end    = cifmap->mem_end,
+			.base_addr  = cifmap->base_addr,
+			.irq        = cifmap->irq,
+			.dma        = cifmap->dma,
+			.port       = cifmap->port,
+		};
+
+		return dev->netdev_ops->ndo_set_config(dev, &ifmap);
+	}
+
+	return dev->netdev_ops->ndo_set_config(dev, &ifr->ifr_map);
+}
+
 /*
  *	Perform the SIOCxIFxxx calls, inside rcu_read_lock()
  */
@@ -128,13 +158,7 @@ static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cm
 		break;
 
 	case SIOCGIFMAP:
-		ifr->ifr_map.mem_start = dev->mem_start;
-		ifr->ifr_map.mem_end   = dev->mem_end;
-		ifr->ifr_map.base_addr = dev->base_addr;
-		ifr->ifr_map.irq       = dev->irq;
-		ifr->ifr_map.dma       = dev->dma;
-		ifr->ifr_map.port      = dev->if_port;
-		return 0;
+		return dev_getifmap(dev, ifr);
 
 	case SIOCGIFINDEX:
 		ifr->ifr_ifindex = dev->ifindex;
@@ -275,12 +299,7 @@ static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
 		return 0;
 
 	case SIOCSIFMAP:
-		if (ops->ndo_set_config) {
-			if (!netif_device_present(dev))
-				return -ENODEV;
-			return ops->ndo_set_config(dev, &ifr->ifr_map);
-		}
-		return -EOPNOTSUPP;
+		return dev_setifmap(dev, ifr);
 
 	case SIOCADDMULTI:
 		if (!ops->ndo_set_rx_mode ||

net/ethtool/ioctl.c

@@ -7,6 +7,7 @@
  * the information ethtool needs.
  */
 
+#include <linux/compat.h>
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/capability.h>
@@ -807,6 +808,120 @@ static noinline_for_stack int ethtool_get_sset_info(struct net_device *dev,
 	return ret;
 }
 
+static noinline_for_stack int
+ethtool_rxnfc_copy_from_compat(struct ethtool_rxnfc *rxnfc,
+			       const struct compat_ethtool_rxnfc __user *useraddr,
+			       size_t size)
+{
+	struct compat_ethtool_rxnfc crxnfc = {};
+
+	/* We expect there to be holes between fs.m_ext and
+	 * fs.ring_cookie and at the end of fs, but nowhere else.
+	 * On non-x86, no conversion should be needed.
+	 */
+	BUILD_BUG_ON(!IS_ENABLED(CONFIG_X86_64) &&
+		     sizeof(struct compat_ethtool_rxnfc) !=
+		     sizeof(struct ethtool_rxnfc));
+	BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
+		     sizeof(useraddr->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_from_user(&crxnfc, useraddr, min(size, sizeof(crxnfc))))
+		return -EFAULT;
+
+	*rxnfc = (struct ethtool_rxnfc) {
+		.cmd		= crxnfc.cmd,
+		.flow_type	= crxnfc.flow_type,
+		.data		= crxnfc.data,
+		.fs		= {
+			.flow_type	= crxnfc.fs.flow_type,
+			.h_u		= crxnfc.fs.h_u,
+			.h_ext		= crxnfc.fs.h_ext,
+			.m_u		= crxnfc.fs.m_u,
+			.m_ext		= crxnfc.fs.m_ext,
+			.ring_cookie	= crxnfc.fs.ring_cookie,
+			.location	= crxnfc.fs.location,
+		},
+		.rule_cnt	= crxnfc.rule_cnt,
+	};
+
+	return 0;
+}
+
+static int ethtool_rxnfc_copy_from_user(struct ethtool_rxnfc *rxnfc,
+					const void __user *useraddr,
+					size_t size)
+{
+	if (compat_need_64bit_alignment_fixup())
+		return ethtool_rxnfc_copy_from_compat(rxnfc, useraddr, size);
+
+	if (copy_from_user(rxnfc, useraddr, size))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int ethtool_rxnfc_copy_to_compat(void __user *useraddr,
+					const struct ethtool_rxnfc *rxnfc,
+					size_t size, const u32 *rule_buf)
+{
+	struct compat_ethtool_rxnfc crxnfc;
+
+	memset(&crxnfc, 0, sizeof(crxnfc));
+	crxnfc = (struct compat_ethtool_rxnfc) {
+		.cmd		= rxnfc->cmd,
+		.flow_type	= rxnfc->flow_type,
+		.data		= rxnfc->data,
+		.fs		= {
+			.flow_type	= rxnfc->fs.flow_type,
+			.h_u		= rxnfc->fs.h_u,
+			.h_ext		= rxnfc->fs.h_ext,
+			.m_u		= rxnfc->fs.m_u,
+			.m_ext		= rxnfc->fs.m_ext,
+			.ring_cookie	= rxnfc->fs.ring_cookie,
+			.location	= rxnfc->fs.location,
+		},
+		.rule_cnt	= rxnfc->rule_cnt,
+	};
+
+	if (copy_to_user(useraddr, &crxnfc, min(size, sizeof(crxnfc))))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int ethtool_rxnfc_copy_to_user(void __user *useraddr,
+				      const struct ethtool_rxnfc *rxnfc,
+				      size_t size, const u32 *rule_buf)
+{
+	int ret;
+
+	if (compat_need_64bit_alignment_fixup()) {
+		ret = ethtool_rxnfc_copy_to_compat(useraddr, rxnfc, size,
+						   rule_buf);
+		useraddr += offsetof(struct compat_ethtool_rxnfc, rule_locs);
+	} else {
+		ret = copy_to_user(useraddr, &rxnfc, size);
+		useraddr += offsetof(struct ethtool_rxnfc, rule_locs);
+	}
+
+	if (ret)
+		return -EFAULT;
+
+	if (rule_buf) {
+		if (copy_to_user(useraddr, rule_buf,
+				 rxnfc->rule_cnt * sizeof(u32)))
+			return -EFAULT;
+	}
+
+	return 0;
+}
+
 static noinline_for_stack int ethtool_set_rxnfc(struct net_device *dev,
 						u32 cmd, void __user *useraddr)
 {
@@ -825,7 +940,7 @@ static noinline_for_stack int ethtool_set_rxnfc(struct net_device *dev,
 		info_size = (offsetof(struct ethtool_rxnfc, data) +
 			     sizeof(info.data));
 
-	if (copy_from_user(&info, useraddr, info_size))
+	if (ethtool_rxnfc_copy_from_user(&info, useraddr, info_size))
 		return -EFAULT;
 
 	rc = dev->ethtool_ops->set_rxnfc(dev, &info);
@@ -833,7 +948,7 @@ static noinline_for_stack int ethtool_set_rxnfc(struct net_device *dev,
 		return rc;
 
 	if (cmd == ETHTOOL_SRXCLSRLINS &&
-	    copy_to_user(useraddr, &info, info_size))
+	    ethtool_rxnfc_copy_to_user(useraddr, &info, info_size, NULL))
 		return -EFAULT;
 
 	return 0;
@@ -859,7 +974,7 @@ static noinline_for_stack int ethtool_get_rxnfc(struct net_device *dev,
 		info_size = (offsetof(struct ethtool_rxnfc, data) +
 			     sizeof(info.data));
 
-	if (copy_from_user(&info, useraddr, info_size))
+	if (ethtool_rxnfc_copy_from_user(&info, useraddr, info_size))
 		return -EFAULT;
 
 	/* If FLOW_RSS was requested then user-space must be using the
@@ -867,7 +982,7 @@ static noinline_for_stack int ethtool_get_rxnfc(struct net_device *dev,
 	 */
 	if (cmd == ETHTOOL_GRXFH && info.flow_type & FLOW_RSS) {
 		info_size = sizeof(info);
-		if (copy_from_user(&info, useraddr, info_size))
+		if (ethtool_rxnfc_copy_from_user(&info, useraddr, info_size))
 			return -EFAULT;
 		/* Since malicious users may modify the original data,
 		 * we need to check whether FLOW_RSS is still requested.
@@ -893,18 +1008,7 @@ static noinline_for_stack int ethtool_get_rxnfc(struct net_device *dev,
 	if (ret < 0)
 		goto err_out;
 
-	ret = -EFAULT;
-	if (copy_to_user(useraddr, &info, info_size))
-		goto err_out;
-
-	if (rule_buf) {
-		useraddr += offsetof(struct ethtool_rxnfc, rule_locs);
-		if (copy_to_user(useraddr, rule_buf,
-				 info.rule_cnt * sizeof(u32)))
-			goto err_out;
-	}
-	ret = 0;
-
+	ret = ethtool_rxnfc_copy_to_user(useraddr, &info, info_size, rule_buf);
 err_out:
 	kfree(rule_buf);
 

net/ieee802154/socket.c

@@ -129,7 +129,7 @@ static int ieee802154_dev_ioctl(struct sock *sk, struct ifreq __user *arg,
 	int ret = -ENOIOCTLCMD;
 	struct net_device *dev;
 
-	if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
+	if (get_user_ifreq(&ifr, NULL, arg))
 		return -EFAULT;
 
 	ifr.ifr_name[IFNAMSIZ-1] = 0;
@@ -143,7 +143,7 @@ static int ieee802154_dev_ioctl(struct sock *sk, struct ifreq __user *arg,
 	if (dev->type == ARPHRD_IEEE802154 && dev->netdev_ops->ndo_do_ioctl)
 		ret = dev->netdev_ops->ndo_do_ioctl(dev, &ifr, cmd);
 
-	if (!ret && copy_to_user(arg, &ifr, sizeof(struct ifreq)))
+	if (!ret && put_user_ifreq(&ifr, arg))
 		ret = -EFAULT;
 	dev_put(dev);
 

net/ipv4/af_inet.c

@@ -953,10 +953,10 @@ int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 	case SIOCGIFNETMASK:
 	case SIOCGIFDSTADDR:
 	case SIOCGIFPFLAGS:
-		if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
+		if (get_user_ifreq(&ifr, NULL, p))
 			return -EFAULT;
 		err = devinet_ioctl(net, cmd, &ifr);
-		if (!err && copy_to_user(p, &ifr, sizeof(struct ifreq)))
+		if (!err && put_user_ifreq(&ifr, p))
 			err = -EFAULT;
 		break;
 
@@ -966,7 +966,7 @@ int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 	case SIOCSIFDSTADDR:
 	case SIOCSIFPFLAGS:
 	case SIOCSIFFLAGS:
-		if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
+		if (get_user_ifreq(&ifr, NULL, p))
 			return -EFAULT;
 		err = devinet_ioctl(net, cmd, &ifr);
 		break;

net/ipv4/devinet.c

@@ -1243,7 +1243,7 @@ int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr)
 	return ret;
 }
 
-static int inet_gifconf(struct net_device *dev, char __user *buf, int len, int size)
+int inet_gifconf(struct net_device *dev, char __user *buf, int len, int size)
 {
 	struct in_device *in_dev = __in_dev_get_rtnl(dev);
 	const struct in_ifaddr *ifa;
@@ -2766,8 +2766,6 @@ void __init devinet_init(void)
 		INIT_HLIST_HEAD(&inet_addr_lst[i]);
 
 	register_pernet_subsys(&devinet_ops);
-
-	register_gifconf(PF_INET, inet_gifconf);
 	register_netdevice_notifier(&ip_netdev_notifier);
 
 	queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);

net/qrtr/qrtr.c

@@ -1153,14 +1153,14 @@ static int qrtr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 		rc = put_user(len, (int __user *)argp);
 		break;
 	case SIOCGIFADDR:
-		if (copy_from_user(&ifr, argp, sizeof(ifr))) {
+		if (get_user_ifreq(&ifr, NULL, argp)) {
 			rc = -EFAULT;
 			break;
 		}
 
 		sq = (struct sockaddr_qrtr *)&ifr.ifr_addr;
 		*sq = ipc->us;
-		if (copy_to_user(argp, &ifr, sizeof(ifr))) {
+		if (put_user_ifreq(&ifr, argp)) {
 			rc = -EFAULT;
 			break;
 		}