Remove 'type' argument from access_ok() function

Nobody has actually used the type (VERIFY_READ vs VERIFY_WRITE) argument
of the user address range verification function since we got rid of the
old racy i386-only code to walk page tables by hand.

It existed because the original 80386 would not honor the write protect
bit when in kernel mode, so you had to do COW by hand before doing any
user access.  But we haven't supported that in a long time, and these
days the 'type' argument is a purely historical artifact.

A discussion about extending 'user_access_begin()' to do the range
checking resulted this patch, because there is no way we're going to
move the old VERIFY_xyz interface to that model.  And it's best done at
the end of the merge window when I've done most of my merges, so let's
just get this done once and for all.

This patch was mostly done with a sed-script, with manual fix-ups for
the cases that weren't of the trivial 'access_ok(VERIFY_xyz' form.

There were a couple of notable cases:

 - csky still had the old "verify_area()" name as an alias.

 - the iter_iov code had magical hardcoded knowledge of the actual
   values of VERIFY_{READ,WRITE} (not that they mattered, since nothing
   really used it)

 - microblaze used the type argument for a debug printout

but other than those oddities this should be a total no-op patch.

I tried to fix up all architectures, did fairly extensive grepping for
access_ok() uses, and the changes are trivial, but I may have missed
something.  Any missed conversion should be trivially fixable, though.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

8 files changed, 22 insertions, 24 deletions

diff --git a/arch/sh/include/asm/checksum_32.h b/arch/sh/include/asm/checksum_32.h
index b58f3d95dc19..36b84cfd3f67 100644
--- a/arch/sh/include/asm/checksum_32.h
+++ b/arch/sh/include/asm/checksum_32.h
@@ -197,7 +197,7 @@ static inline __wsum csum_and_copy_to_user(const void *src,
 					   int len, __wsum sum,
 					   int *err_ptr)
 {
-	if (access_ok(VERIFY_WRITE, dst, len))
+	if (access_ok(dst, len))
 		return csum_partial_copy_generic((__force const void *)src,
 						dst, len, sum, NULL, err_ptr);
 
diff --git a/arch/sh/include/asm/futex.h b/arch/sh/include/asm/futex.h
index 6d192f4908a7..3190ec89df81 100644
--- a/arch/sh/include/asm/futex.h
+++ b/arch/sh/include/asm/futex.h
@@ -22,7 +22,7 @@ static inline int
 futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
 			      u32 oldval, u32 newval)
 {
-	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
+	if (!access_ok(uaddr, sizeof(u32)))
 		return -EFAULT;
 
 	return atomic_futex_op_cmpxchg_inatomic(uval, uaddr, oldval, newval);
diff --git a/arch/sh/include/asm/uaccess.h b/arch/sh/include/asm/uaccess.h
index 32eb56e00c11..deebbfab5342 100644
--- a/arch/sh/include/asm/uaccess.h
+++ b/arch/sh/include/asm/uaccess.h
@@ -18,7 +18,7 @@
  */
 #define __access_ok(addr, size)		\
 	(__addr_ok((addr) + (size)))
-#define access_ok(type, addr, size)	\
+#define access_ok(addr, size)	\
 	(__chk_user_ptr(addr),		\
 	 __access_ok((unsigned long __force)(addr), (size)))
 
@@ -66,7 +66,7 @@ struct __large_struct { unsigned long buf[100]; };
 	long __gu_err = -EFAULT;					\
 	unsigned long __gu_val = 0;					\
 	const __typeof__(*(ptr)) *__gu_addr = (ptr);			\
-	if (likely(access_ok(VERIFY_READ, __gu_addr, (size))))		\
+	if (likely(access_ok(__gu_addr, (size))))		\
 		__get_user_size(__gu_val, __gu_addr, (size), __gu_err);	\
 	(x) = (__force __typeof__(*(ptr)))__gu_val;			\
 	__gu_err;							\
@@ -87,7 +87,7 @@ struct __large_struct { unsigned long buf[100]; };
 	long __pu_err = -EFAULT;				\
 	__typeof__(*(ptr)) __user *__pu_addr = (ptr);		\
 	__typeof__(*(ptr)) __pu_val = x;			\
-	if (likely(access_ok(VERIFY_WRITE, __pu_addr, size)))	\
+	if (likely(access_ok(__pu_addr, size)))	\
 		__put_user_size(__pu_val, __pu_addr, (size),	\
 				__pu_err);			\
 	__pu_err;						\
@@ -132,8 +132,7 @@ __kernel_size_t __clear_user(void *addr, __kernel_size_t size);
 	void __user * __cl_addr = (addr);				\
 	unsigned long __cl_size = (n);					\
 									\
-	if (__cl_size && access_ok(VERIFY_WRITE,			\
-		((unsigned long)(__cl_addr)), __cl_size))		\
+	if (__cl_size && access_ok(__cl_addr, __cl_size))		\
 		__cl_size = __clear_user(__cl_addr, __cl_size);		\
 									\
 	__cl_size;							\
diff --git a/arch/sh/kernel/signal_32.c b/arch/sh/kernel/signal_32.c
index c46c0020ff55..2a2121ba8ebe 100644
--- a/arch/sh/kernel/signal_32.c
+++ b/arch/sh/kernel/signal_32.c
@@ -160,7 +160,7 @@ asmlinkage int sys_sigreturn(void)
         /* Always make any pending restarted system calls return -EINTR */
 	current->restart_block.fn = do_no_restart_syscall;
 
-	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
+	if (!access_ok(frame, sizeof(*frame)))
 		goto badframe;
 
 	if (__get_user(set.sig[0], &frame->sc.oldmask)
@@ -190,7 +190,7 @@ asmlinkage int sys_rt_sigreturn(void)
 	/* Always make any pending restarted system calls return -EINTR */
 	current->restart_block.fn = do_no_restart_syscall;
 
-	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
+	if (!access_ok(frame, sizeof(*frame)))
 		goto badframe;
 
 	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
@@ -272,7 +272,7 @@ static int setup_frame(struct ksignal *ksig, sigset_t *set,
 
 	frame = get_sigframe(&ksig->ka, regs->regs[15], sizeof(*frame));
 
-	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+	if (!access_ok(frame, sizeof(*frame)))
 		return -EFAULT;
 
 	err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
@@ -338,7 +338,7 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
 
 	frame = get_sigframe(&ksig->ka, regs->regs[15], sizeof(*frame));
 
-	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+	if (!access_ok(frame, sizeof(*frame)))
 		return -EFAULT;
 
 	err |= copy_siginfo_to_user(&frame->info, &ksig->info);
diff --git a/arch/sh/kernel/signal_64.c b/arch/sh/kernel/signal_64.c
index 76661dee3c65..f1f1598879c2 100644
--- a/arch/sh/kernel/signal_64.c
+++ b/arch/sh/kernel/signal_64.c
@@ -259,7 +259,7 @@ asmlinkage int sys_sigreturn(unsigned long r2, unsigned long r3,
 	/* Always make any pending restarted system calls return -EINTR */
 	current->restart_block.fn = do_no_restart_syscall;
 
-	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
+	if (!access_ok(frame, sizeof(*frame)))
 		goto badframe;
 
 	if (__get_user(set.sig[0], &frame->sc.oldmask)
@@ -293,7 +293,7 @@ asmlinkage int sys_rt_sigreturn(unsigned long r2, unsigned long r3,
 	/* Always make any pending restarted system calls return -EINTR */
 	current->restart_block.fn = do_no_restart_syscall;
 
-	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
+	if (!access_ok(frame, sizeof(*frame)))
 		goto badframe;
 
 	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
@@ -379,7 +379,7 @@ static int setup_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs
 
 	frame = get_sigframe(&ksig->ka, regs->regs[REG_SP], sizeof(*frame));
 
-	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+	if (!access_ok(frame, sizeof(*frame)))
 		return -EFAULT;
 
 	err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
@@ -465,7 +465,7 @@ static int setup_rt_frame(struct ksignal *kig, sigset_t *set,
 
 	frame = get_sigframe(&ksig->ka, regs->regs[REG_SP], sizeof(*frame));
 
-	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+	if (!access_ok(frame, sizeof(*frame)))
 		return -EFAULT;
 
 	err |= __put_user(&frame->info, &frame->pinfo);
diff --git a/arch/sh/kernel/traps_64.c b/arch/sh/kernel/traps_64.c
index c52bda4d2574..8ce90a7da67d 100644
--- a/arch/sh/kernel/traps_64.c
+++ b/arch/sh/kernel/traps_64.c
@@ -40,7 +40,7 @@ static int read_opcode(reg_size_t pc, insn_size_t *result_opcode, int from_user_
 		/* SHmedia */
 		aligned_pc = pc & ~3;
 		if (from_user_mode) {
-			if (!access_ok(VERIFY_READ, aligned_pc, sizeof(insn_size_t))) {
+			if (!access_ok(aligned_pc, sizeof(insn_size_t))) {
 				get_user_error = -EFAULT;
 			} else {
 				get_user_error = __get_user(opcode, (insn_size_t *)aligned_pc);
@@ -180,7 +180,7 @@ static int misaligned_load(struct pt_regs *regs,
 	if (user_mode(regs)) {
 		__u64 buffer;
 
-		if (!access_ok(VERIFY_READ, (unsigned long) address, 1UL<<width_shift)) {
+		if (!access_ok((unsigned long) address, 1UL<<width_shift)) {
 			return -1;
 		}
 
@@ -254,7 +254,7 @@ static int misaligned_store(struct pt_regs *regs,
 	if (user_mode(regs)) {
 		__u64 buffer;
 
-		if (!access_ok(VERIFY_WRITE, (unsigned long) address, 1UL<<width_shift)) {
+		if (!access_ok((unsigned long) address, 1UL<<width_shift)) {
 			return -1;
 		}
 
@@ -327,7 +327,7 @@ static int misaligned_fpu_load(struct pt_regs *regs,
 		__u64 buffer;
 		__u32 buflo, bufhi;
 
-		if (!access_ok(VERIFY_READ, (unsigned long) address, 1UL<<width_shift)) {
+		if (!access_ok((unsigned long) address, 1UL<<width_shift)) {
 			return -1;
 		}
 
@@ -400,7 +400,7 @@ static int misaligned_fpu_store(struct pt_regs *regs,
 		/* Initialise these to NaNs. */
 		__u32 buflo=0xffffffffUL, bufhi=0xffffffffUL;
 
-		if (!access_ok(VERIFY_WRITE, (unsigned long) address, 1UL<<width_shift)) {
+		if (!access_ok((unsigned long) address, 1UL<<width_shift)) {
 			return -1;
 		}
 
@@ -663,7 +663,7 @@ void do_reserved_inst(unsigned long error_code, struct pt_regs *regs)
 	/* SHmedia : check for defect.  This requires executable vmas
 	   to be readable too. */
 	aligned_pc = pc & ~3;
-	if (!access_ok(VERIFY_READ, aligned_pc, sizeof(insn_size_t)))
+	if (!access_ok(aligned_pc, sizeof(insn_size_t)))
 		get_user_error = -EFAULT;
 	else
 		get_user_error = __get_user(opcode, (insn_size_t *)aligned_pc);
diff --git a/arch/sh/mm/gup.c b/arch/sh/mm/gup.c
index 56c86ca98ecf..3e27f6d1f1ec 100644
--- a/arch/sh/mm/gup.c
+++ b/arch/sh/mm/gup.c
@@ -177,8 +177,7 @@ int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
 	addr = start;
 	len = (unsigned long) nr_pages << PAGE_SHIFT;
 	end = start + len;
-	if (unlikely(!access_ok(write ? VERIFY_WRITE : VERIFY_READ,
-					(void __user *)start, len)))
+	if (unlikely(!access_ok((void __user *)start, len)))
 		return 0;
 
 	/*
diff --git a/arch/sh/oprofile/backtrace.c b/arch/sh/oprofile/backtrace.c
index c7695f99c8c3..8279a7e91043 100644
--- a/arch/sh/oprofile/backtrace.c
+++ b/arch/sh/oprofile/backtrace.c
@@ -51,7 +51,7 @@ user_backtrace(unsigned long *stackaddr, struct pt_regs *regs)
 	unsigned long buf_stack;
 
 	/* Also check accessibility of address */
-	if (!access_ok(VERIFY_READ, stackaddr, sizeof(unsigned long)))
+	if (!access_ok(stackaddr, sizeof(unsigned long)))
 		return NULL;
 
 	if (__copy_from_user_inatomic(&buf_stack, stackaddr, sizeof(unsigned long)))