PPC32: Start adding __user to mark pointers from userspace.

This reduces the number of warnings from Linus' `check' program
for stuff in arch/ppc.

arch/ppc/kernel/align.c

@@ -189,7 +189,7 @@ fix_alignment(struct pt_regs *regs)
 #endif
 	int i, t;
 	int reg, areg;
-	unsigned char *addr;
+	unsigned char __user *addr;
 	union {
 		long l;
 		float f;
@@ -252,7 +252,7 @@ fix_alignment(struct pt_regs *regs)
 	 * pt_regs structure is overloaded and is really from the DEAR.
 	 */
 
-	addr = (unsigned char *)regs->dar;
+	addr = (unsigned char __user *)regs->dar;
 
 	/* Verify the address of the operand */
 	if (user_mode(regs)) {

arch/ppc/kernel/irq.c

@@ -584,7 +584,7 @@ static int irq_affinity_read_proc (char *page, char **start, off_t off,
 	return sprintf (page, "%08x\n", irq_affinity[(int)data]);
 }
 
-static unsigned int parse_hex_value (const char *buffer,
+static unsigned int parse_hex_value (const char __user *buffer,
 		unsigned long count, unsigned long *ret)
 {
 	unsigned char hexnum [HEX_DIGITS];
@@ -621,7 +621,7 @@ static unsigned int parse_hex_value (const char *buffer,
 	return 0;
 }
 
-static int irq_affinity_write_proc (struct file *file, const char *buffer,
+static int irq_affinity_write_proc (struct file *file, const char __user *buffer,
 					unsigned long count, void *data)
 {
 	int irq = (int) data, full_count = count, err;
@@ -660,7 +660,7 @@ static int prof_cpu_mask_read_proc (char *page, char **start, off_t off,
 	return sprintf (page, "%08lx\n", *mask);
 }
 
-static int prof_cpu_mask_write_proc (struct file *file, const char *buffer,
+static int prof_cpu_mask_write_proc (struct file *file, const char __user *buffer,
 					unsigned long count, void *data)
 {
 	unsigned long *mask = (unsigned long *) data, full_count = count, err;

arch/ppc/kernel/ppc_htab.c

@@ -30,13 +30,13 @@
 #include <asm/cputable.h>
 #include <asm/system.h>
 
-static ssize_t ppc_htab_read(struct file * file, char * buf,
+static ssize_t ppc_htab_read(struct file * file, char __user * buf,
 			     size_t count, loff_t *ppos);
-static ssize_t ppc_htab_write(struct file * file, const char * buffer,
+static ssize_t ppc_htab_write(struct file * file, const char __user * buffer,
 			      size_t count, loff_t *ppos);
 static long long ppc_htab_lseek(struct file * file, loff_t offset, int orig);
 int proc_dol2crvec(ctl_table *table, int write, struct file *filp,
-		  void *buffer, size_t *lenp);
+		  void __user *buffer, size_t *lenp);
 
 extern PTE *Hash, *Hash_end;
 extern unsigned long Hash_size, Hash_mask;
@@ -109,7 +109,7 @@ static char *pmc2_lookup(unsigned long mmcr0)
  * is _REALLY_ slow (see the nested for loops below) but nothing
  * in here should be really timing critical. -- Cort
  */
-static ssize_t ppc_htab_read(struct file * file, char * buf,
+static ssize_t ppc_htab_read(struct file * file, char __user * buf,
 			     size_t count, loff_t *ppos)
 {
 	unsigned long mmcr0 = 0, pmc1 = 0, pmc2 = 0;
@@ -211,13 +211,19 @@ static ssize_t ppc_htab_read(struct file * file, char * buf,
 /*
  * Allow user to define performance counters and resize the hash table
  */
-static ssize_t ppc_htab_write(struct file * file, const char * buffer,
+static ssize_t ppc_htab_write(struct file * file, const char __user * ubuffer,
 			      size_t count, loff_t *ppos)
 {
 #ifdef CONFIG_PPC_STD_MMU
 	unsigned long tmp;
+	char buffer[16];
+
 	if ( current->uid != 0 )
 		return -EACCES;
+	if (strncpy_from_user(buffer, ubuffer, 15))
+		return -EFAULT;
+	buffer[15] = 0;
+
 	/* don't set the htab size for now */
 	if ( !strncmp( buffer, "size ", 5) )
 		return -EBUSY;
@@ -387,9 +393,10 @@ ppc_htab_lseek(struct file * file, loff_t offset, int orig)
 }
 
 int proc_dol2crvec(ctl_table *table, int write, struct file *filp,
-		  void *buffer, size_t *lenp)
+		  void __user *buffer_arg, size_t *lenp)
 {
 	int vleft, first=1, len, left, val;
+	char __user *buffer = (char __user *) buffer_arg;
 	#define TMPBUFLEN 256
 	char buf[TMPBUFLEN], *p;
 	static const char *sizestrings[4] = {
@@ -422,12 +429,12 @@ int proc_dol2crvec(ctl_table *table, int write, struct file *filp,
 		if (write) {
 			while (left) {
 				char c;
-				if(get_user(c,(char *) buffer))
+				if(get_user(c, buffer))
 					return -EFAULT;
 				if (!isspace(c))
 					break;
 				left--;
-				((char *) buffer)++;
+				buffer++;
 			}
 			if (!left)
 				break;
@@ -474,7 +481,7 @@ int proc_dol2crvec(ctl_table *table, int write, struct file *filp,
 			len = strlen(buf);
 			if (len > left)
 				len = left;
-			if(copy_to_user(buffer, buf, len))
+			if (copy_to_user(buffer, buf, len))
 				return -EFAULT;
 			left -= len;
 			buffer += len;

arch/ppc/kernel/process.c

@@ -441,8 +441,9 @@ int get_fpexc_mode(struct task_struct *tsk, unsigned long adr)
 	return put_user(val, (unsigned int *) adr);
 }
 
-int sys_clone(unsigned long clone_flags, unsigned long usp, int *parent_tidp,
-	      void *child_threadptr, int *child_tidp, int p6,
+int sys_clone(unsigned long clone_flags, unsigned long usp,
+	      int __user *parent_tidp, void __user *child_threadptr,
+	      int __user *child_tidp, int p6,
 	      struct pt_regs *regs)
 {
 	CHECK_FULL_REGS(regs);
@@ -474,7 +475,7 @@ int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2,
 	int error;
 	char * filename;
 
-	filename = getname((char *) a0);
+	filename = getname((char __user *) a0);
 	error = PTR_ERR(filename);
 	if (IS_ERR(filename))
 		goto out;
@@ -484,7 +485,8 @@ int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2,
 	if (regs->msr & MSR_VEC)
 		giveup_altivec(current);
 #endif /* CONFIG_ALTIVEC */ 
-	error = do_execve(filename, (char **) a1, (char **) a2, regs);
+	error = do_execve(filename, (char __user *__user *) a1,
+			  (char __user *__user *) a2, regs);
 	if (error == 0)
 		current->ptrace &= ~PT_DTRACE;
 	putname(filename);

arch/ppc/kernel/signal.c

@@ -83,8 +83,8 @@ sys_sigsuspend(old_sigset_t mask, int p2, int p3, int p4, int p6, int p7,
 }
 
 int
-sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize, int p3, int p4, int p6,
-		  int p7, struct pt_regs *regs)
+sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize, int p3, int p4,
+		  int p6, int p7, struct pt_regs *regs)
 {
 	sigset_t saveset, newset;
 
@@ -115,15 +115,15 @@ sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize, int p3, int p4, int p6,
 
 
 int
-sys_sigaltstack(const stack_t *uss, stack_t *uoss, int r5, int r6,
-		int r7, int r8, struct pt_regs *regs)
+sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, int r5,
+		int r6, int r7, int r8, struct pt_regs *regs)
 {
 	return do_sigaltstack(uss, uoss, regs->gpr[1]);
 }
 
 int 
-sys_sigaction(int sig, const struct old_sigaction *act,
-	      struct old_sigaction *oact)
+sys_sigaction(int sig, const struct old_sigaction __user *act,
+	      struct old_sigaction __user *oact)
 {
 	struct k_sigaction new_ka, old_ka;
 	int ret;
@@ -195,14 +195,14 @@ struct rt_sigframe
 int sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
 		     struct pt_regs *regs)
 {
-	struct rt_sigframe *rt_sf;
+	struct rt_sigframe __user *rt_sf;
 	struct sigcontext sigctx;
-	struct sigregs *sr;
+	struct sigregs __user *sr;
 	elf_gregset_t saved_regs;  /* an array of ELF_NGREG unsigned longs */
 	sigset_t set;
 	stack_t st;
 
-	rt_sf = (struct rt_sigframe *)(regs->gpr[1] + __SIGNAL_FRAMESIZE);
+	rt_sf = (struct rt_sigframe __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE);
 	if (copy_from_user(&sigctx, &rt_sf->uc.uc_mcontext, sizeof(sigctx))
 	    || copy_from_user(&set, &rt_sf->uc.uc_sigmask, sizeof(set))
 	    || copy_from_user(&st, &rt_sf->uc.uc_stack, sizeof(st)))
@@ -220,7 +220,7 @@ int sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
 	 * preamble frame (where registers are stored) 
 	 * see handle_signal()
 	 */
-	sr = (struct sigregs *) sigctx.regs;
+	sr = (struct sigregs __user *) sigctx.regs;
 	if (copy_from_user(saved_regs, &sr->gp_regs, sizeof(sr->gp_regs)))
 		goto badframe;
 	saved_regs[PT_MSR] = (regs->msr & ~MSR_USERCHANGE)
@@ -229,9 +229,6 @@ int sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
 	if (copy_from_user(current->thread.fpr, &sr->fp_regs,
 			   sizeof(sr->fp_regs)))
 		goto badframe;
-	/* This function sets back the stack flags into
-	   the current task structure.  */
-	sys_sigaltstack(&st, NULL, 0, 0, 0, 0, regs);
 
 	sigreturn_exit(regs);		/* doesn't return here */
 	return 0;
@@ -241,10 +238,10 @@ int sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
 }
 
 static void
-setup_rt_frame(struct pt_regs *regs, struct sigregs *frame,
+setup_rt_frame(struct pt_regs *regs, struct sigregs __user *frame,
 	       signed long newsp)
 {
-	struct rt_sigframe *rt_sf = (struct rt_sigframe *) newsp;
+	struct rt_sigframe __user *rt_sf = (struct rt_sigframe __user *) newsp;
 
 	/* Set up preamble frame */
 	if (verify_area(VERIFY_WRITE, frame, sizeof(*frame)))
@@ -270,11 +267,11 @@ setup_rt_frame(struct pt_regs *regs, struct sigregs *frame,
 	   set up registers for signal handler
 	*/
 	newsp -= __SIGNAL_FRAMESIZE;
-	if (put_user(regs->gpr[1], (unsigned long *)newsp)
+	if (put_user(regs->gpr[1], (unsigned long __user *)newsp)
 	    || get_user(regs->nip, &rt_sf->uc.uc_mcontext.handler)
 	    || get_user(regs->gpr[3], &rt_sf->uc.uc_mcontext.signal)
-	    || get_user(regs->gpr[4], (unsigned long *)&rt_sf->pinfo)
-	    || get_user(regs->gpr[5], (unsigned long *)&rt_sf->puc))
+	    || get_user(regs->gpr[4], (unsigned long __user *)&rt_sf->pinfo)
+	    || get_user(regs->gpr[5], (unsigned long __user *)&rt_sf->puc))
 		goto badframe;
 
 	regs->gpr[1] = newsp;
@@ -297,12 +294,13 @@ setup_rt_frame(struct pt_regs *regs, struct sigregs *frame,
 int sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
 		  struct pt_regs *regs)
 {
-	struct sigcontext *sc, sigctx;
-	struct sigregs *sr;
+	struct sigcontext __user *sc;
+	struct sigcontext sigctx;
+	struct sigregs __user *sr;
 	elf_gregset_t saved_regs;  /* an array of ELF_NGREG unsigned longs */
 	sigset_t set;
 
-	sc = (struct sigcontext *)(regs->gpr[1] + __SIGNAL_FRAMESIZE);
+	sc = (struct sigcontext __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE);
 	if (copy_from_user(&sigctx, sc, sizeof(sigctx)))
 		goto badframe;
 
@@ -319,7 +317,7 @@ int sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
 		giveup_fpu(current);
 
 	/* restore registers */
-	sr = (struct sigregs *) sigctx.regs;
+	sr = (struct sigregs __user *) sigctx.regs;
 	if (copy_from_user(saved_regs, &sr->gp_regs, sizeof(sr->gp_regs)))
 		goto badframe;
 	saved_regs[PT_MSR] = (regs->msr & ~MSR_USERCHANGE)
@@ -341,10 +339,10 @@ int sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
  * Set up a signal frame.
  */
 static void
-setup_frame(struct pt_regs *regs, struct sigregs *frame,
+setup_frame(struct pt_regs *regs, struct sigregs __user *frame,
 	    unsigned long newsp)
 {
-	struct sigcontext *sc = (struct sigcontext *) newsp;
+	struct sigcontext __user *sc = (struct sigcontext __user *) newsp;
 
 	if (verify_area(VERIFY_WRITE, frame, sizeof(*frame)))
 		goto badframe;
@@ -362,7 +360,7 @@ setup_frame(struct pt_regs *regs, struct sigregs *frame,
 	current->thread.fpscr = 0;	/* turn off all fp exceptions */
 
 	newsp -= __SIGNAL_FRAMESIZE;
-	if (put_user(regs->gpr[1], (unsigned long *)newsp)
+	if (put_user(regs->gpr[1], (unsigned long __user *)newsp)
 	    || get_user(regs->nip, &sc->handler)
 	    || get_user(regs->gpr[3], &sc->signal))
 		goto badframe;
@@ -387,8 +385,8 @@ static void
 handle_signal(unsigned long sig, siginfo_t *info, sigset_t *oldset,
 	struct pt_regs * regs, unsigned long *newspp, unsigned long frame)
 {
-	struct sigcontext *sc;
-	struct rt_sigframe *rt_sf;
+	struct sigcontext __user *sc;
+	struct rt_sigframe __user *rt_sf;
 	struct k_sigaction *ka = &current->sighand->action[sig-1];
 
 	if (TRAP(regs) == 0x0C00 /* System Call! */
@@ -408,7 +406,7 @@ handle_signal(unsigned long sig, siginfo_t *info, sigset_t *oldset,
 	if (ka->sa.sa_flags & SA_SIGINFO) {
 		/* Put a Real Time Context onto stack */
 		*newspp -= sizeof(*rt_sf);
-		rt_sf = (struct rt_sigframe *) *newspp;
+		rt_sf = (struct rt_sigframe __user *) *newspp;
 		if (verify_area(VERIFY_WRITE, rt_sf, sizeof(*rt_sf)))
 			goto badframe;
 
@@ -432,7 +430,7 @@ handle_signal(unsigned long sig, siginfo_t *info, sigset_t *oldset,
 	} else {
 		/* Put a sigcontext on the stack */
 		*newspp -= sizeof(*sc);
-		sc = (struct sigcontext *) *newspp;
+		sc = (struct sigcontext __user *) *newspp;
 		if (verify_area(VERIFY_WRITE, sc, sizeof(*sc)))
 			goto badframe;
 		
@@ -516,9 +514,9 @@ int do_signal(sigset_t *oldset, struct pt_regs *regs)
 		return 0;		/* no signals delivered */
 
 	if (ka->sa.sa_flags & SA_SIGINFO)
-		setup_rt_frame(regs, (struct sigregs *) frame, newsp);
+		setup_rt_frame(regs, (struct sigregs __user *) frame, newsp);
 	else
-		setup_frame(regs, (struct sigregs *) frame, newsp);
+		setup_frame(regs, (struct sigregs __user *) frame, newsp);
 	return 1;
 }
 

arch/ppc/kernel/syscalls.c

@@ -52,7 +52,7 @@ check_bugs(void)
  * This is really horribly ugly.
  */
 int
-sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth)
+sys_ipc (uint call, int first, int second, int third, void __user *ptr, long fifth)
 {
 	int version, ret;
 
@@ -62,7 +62,7 @@ sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth)
 	ret = -EINVAL;
 	switch (call) {
 	case SEMOP:
-		ret = sys_semop (first, (struct sembuf *)ptr, second);
+		ret = sys_semop (first, (struct sembuf __user *)ptr, second);
 		break;
 	case SEMGET:
 		ret = sys_semget (first, second, third);
@@ -73,13 +73,13 @@ sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth)
 		if (!ptr)
 			break;
 		if ((ret = verify_area (VERIFY_READ, ptr, sizeof(long)))
-		    || (ret = get_user(fourth.__pad, (void **)ptr)))
+		    || (ret = get_user(fourth.__pad, (void *__user *)ptr)))
 			break;
 		ret = sys_semctl (first, second, third, fourth);
 		break;
 		}
 	case MSGSND:
-		ret = sys_msgsnd (first, (struct msgbuf *) ptr, second, third);
+		ret = sys_msgsnd (first, (struct msgbuf __user *) ptr, second, third);
 		break;
 	case MSGRCV:
 		switch (version) {
@@ -90,7 +90,7 @@ sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth)
 				break;
 			if ((ret = verify_area (VERIFY_READ, ptr, sizeof(tmp)))
 			    || (ret = copy_from_user(&tmp,
-						(struct ipc_kludge *) ptr,
+					(struct ipc_kludge __user *) ptr,
 					sizeof (tmp)) ? -EFAULT : 0))
 				break;
 			ret = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp,
@@ -98,7 +98,7 @@ sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth)
 			break;
 			}
 		default:
-			ret = sys_msgrcv (first, (struct msgbuf *) ptr,
+			ret = sys_msgrcv (first, (struct msgbuf __user *) ptr,
 					  second, fifth, third);
 			break;
 		}
@@ -107,38 +107,28 @@ sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth)
 		ret = sys_msgget ((key_t) first, second);
 		break;
 	case MSGCTL:
-		ret = sys_msgctl (first, second, (struct msqid_ds *) ptr);
+		ret = sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
 		break;
-	case SHMAT:
-		switch (version) {
-		default: {
+	case SHMAT: {
 		ulong raddr;
 
-			if ((ret = verify_area(VERIFY_WRITE, (ulong*) third,
+		if ((ret = verify_area(VERIFY_WRITE, (ulong __user *) third,
 				       sizeof(ulong))))
 			break;
-			ret = sys_shmat (first, (char *) ptr, second, &raddr);
+		ret = sys_shmat (first, (char __user *) ptr, second, &raddr);
 		if (ret)
 			break;
-			ret = put_user (raddr, (ulong *) third);
+		ret = put_user (raddr, (ulong __user *) third);
 		break;
 		}
-		case 1:	/* iBCS2 emulator entry point */
-			if (!segment_eq(get_fs(), get_ds()))
-				break;
-			ret = sys_shmat (first, (char *) ptr, second,
-					 (ulong *) third);
-			break;
-		}
-		break;
 	case SHMDT: 
-		ret = sys_shmdt ((char *)ptr);
+		ret = sys_shmdt ((char __user *)ptr);
 		break;
 	case SHMGET:
 		ret = sys_shmget (first, second, third);
 		break;
 	case SHMCTL:
-		ret = sys_shmctl (first, second, (struct shmid_ds *) ptr);
+		ret = sys_shmctl (first, second, (struct shmid_ds __user *) ptr);
 		break;
 	}
 
@@ -149,7 +139,7 @@ sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth)
  * sys_pipe() is the normal C calling standard for creating
  * a pipe. It's not the way unix traditionally does this, though.
  */
-int sys_pipe(int *fildes)
+int sys_pipe(int __user *fildes)
 {
 	int fd[2];
 	int error;
@@ -219,7 +209,7 @@ ppc_select(int n, fd_set *inp, fd_set *outp, fd_set *exp, struct timeval *tvp)
 {
 	if ( (unsigned long)n >= 4096 )
 	{
-		unsigned long *buffer = (unsigned long *)n;
+		unsigned long __user *buffer = (unsigned long __user *)n;
 		if (verify_area(VERIFY_READ, buffer, 5*sizeof(unsigned long))
 		    || __get_user(n, buffer)
 		    || __get_user(inp, ((fd_set **)(buffer+1)))
@@ -231,7 +221,7 @@ ppc_select(int n, fd_set *inp, fd_set *outp, fd_set *exp, struct timeval *tvp)
 	return sys_select(n, inp, outp, exp, tvp);
 }
 
-int sys_uname(struct old_utsname * name)
+int sys_uname(struct old_utsname __user * name)
 {
 	int err = -EFAULT;
 
@@ -242,7 +232,7 @@ int sys_uname(struct old_utsname * name)
 	return err;
 }
 
-int sys_olduname(struct oldold_utsname * name)
+int sys_olduname(struct oldold_utsname __user * name)
 {
 	int error;
 

arch/ppc/kernel/traps.c

@@ -281,7 +281,7 @@ emulate_instruction(struct pt_regs *regs)
 		return retval;
 	CHECK_FULL_REGS(regs);
 
-	if (get_user(instword, (uint *)(regs->nip)))
+	if (get_user(instword, (uint __user *)(regs->nip)))
 		return -EFAULT;
 
 	/* Emulate the mfspr rD, PVR.

include/asm-ppc/ipc.h

@@ -7,7 +7,7 @@
  * See arch/ppc/kernel/syscalls.c for ugly details..
  */
 struct ipc_kludge {
-	struct msgbuf *msgp;
+	struct msgbuf __user *msgp;
 	long msgtyp;
 };
 

include/asm-ppc/uaccess.h

@@ -32,7 +32,7 @@
 #define __access_ok(addr,size) (__kernel_ok || __user_ok((addr),(size)))
 #define access_ok(type,addr,size) __access_ok((unsigned long)(addr),(size))
 
-extern inline int verify_area(int type, const void * addr, unsigned long size)
+extern inline int verify_area(int type, const void __user * addr, unsigned long size)
 {
 	return access_ok(type,addr,size) ? 0 : -EFAULT;
 }
@@ -225,45 +225,46 @@ do {								\
 
 /* more complex routines */
 
-extern int __copy_tofrom_user(void *to, const void *from, unsigned long size);
+extern int __copy_tofrom_user(void __user *to, const void __user *from,
+			      unsigned long size);
 
 extern inline unsigned long
-copy_from_user(void *to, const void *from, unsigned long n)
+copy_from_user(void *to, const void __user *from, unsigned long n)
 {
 	unsigned long over;
 
 	if (access_ok(VERIFY_READ, from, n))
-		return __copy_tofrom_user(to, from, n);
+		return __copy_tofrom_user((void __user *)to, from, n);
 	if ((unsigned long)from < TASK_SIZE) {
 		over = (unsigned long)from + n - TASK_SIZE;
-		return __copy_tofrom_user(to, from, n - over) + over;
+		return __copy_tofrom_user((void __user *)to, from, n - over) + over;
 	}
 	return n;
 }
 
 extern inline unsigned long
-copy_to_user(void *to, const void *from, unsigned long n)
+copy_to_user(void __user *to, const void *from, unsigned long n)
 {
 	unsigned long over;
 
 	if (access_ok(VERIFY_WRITE, to, n))
-		return __copy_tofrom_user(to, from, n);
+		return __copy_tofrom_user(to, (void __user *) from, n);
 	if ((unsigned long)to < TASK_SIZE) {
 		over = (unsigned long)to + n - TASK_SIZE;
-		return __copy_tofrom_user(to, from, n - over) + over;
+		return __copy_tofrom_user(to, (void __user *) from, n - over) + over;
 	}
 	return n;
 }
 
 #define __copy_from_user(to, from, size) \
-	__copy_tofrom_user((to), (from), (size))
+	__copy_tofrom_user((void __user *)(to), (from), (size))
 #define __copy_to_user(to, from, size) \
-	__copy_tofrom_user((to), (from), (size))
+	__copy_tofrom_user((to), (void __user *)(from), (size))
 
-extern unsigned long __clear_user(void *addr, unsigned long size);
+extern unsigned long __clear_user(void __user *addr, unsigned long size);
 
 extern inline unsigned long
-clear_user(void *addr, unsigned long size)
+clear_user(void __user *addr, unsigned long size)
 {
 	if (access_ok(VERIFY_WRITE, addr, size))
 		return __clear_user(addr, size);
@@ -274,10 +275,10 @@ clear_user(void *addr, unsigned long size)
 	return size;
 }
 
-extern int __strncpy_from_user(char *dst, const char *src, long count);
+extern int __strncpy_from_user(char *dst, const char __user *src, long count);
 
 extern inline long
-strncpy_from_user(char *dst, const char *src, long count)
+strncpy_from_user(char *dst, const char __user *src, long count)
 {
 	if (access_ok(VERIFY_READ, src, 1))
 		return __strncpy_from_user(dst, src, count);
@@ -290,7 +291,7 @@ strncpy_from_user(char *dst, const char *src, long count)
  * Return 0 for error
  */
 
-extern int __strnlen_user(const char *str, long len, unsigned long top);
+extern int __strnlen_user(const char __user *str, long len, unsigned long top);
 
 /*
  * Returns the length of the string at str (including the null byte),
@@ -300,7 +301,7 @@ extern int __strnlen_user(const char *str, long len, unsigned long top);
  * The `top' parameter to __strnlen_user is to make sure that
  * we can never overflow from the user area into kernel space.
  */
-extern __inline__ int strnlen_user(const char *str, long len)
+extern __inline__ int strnlen_user(const char __user *str, long len)
 {
 	unsigned long top = __kernel_ok? ~0UL: TASK_SIZE - 1;