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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_UACCESS_H
#define _ASM_X86_UACCESS_H
/*
 * User space memory access functions
 */
#include <linux/compiler.h>
#include <linux/kasan-checks.h>
#include <linux/string.h>
#include <asm/asm.h>
#include <asm/page.h>
#include <asm/smap.h>
#include <asm/extable.h>

/*
 * The fs value determines whether argument validity checking should be
 * performed or not.  If get_fs() == USER_DS, checking is performed, with
 * get_fs() == KERNEL_DS, checking is bypassed.
 *
 * For historical reasons, these macros are grossly misnamed.
 */

#define MAKE_MM_SEG(s)	((mm_segment_t) { (s) })

#define KERNEL_DS	MAKE_MM_SEG(-1UL)
#define USER_DS 	MAKE_MM_SEG(TASK_SIZE_MAX)

#define get_ds()	(KERNEL_DS)
#define get_fs()	(current->thread.addr_limit)
static inline void set_fs(mm_segment_t fs)
{
	current->thread.addr_limit = fs;
	/* On user-mode return, check fs is correct */
	set_thread_flag(TIF_FSCHECK);
}

#define segment_eq(a, b)	((a).seg == (b).seg)

#define user_addr_max() (current->thread.addr_limit.seg)
#define __addr_ok(addr) 	\
	((unsigned long __force)(addr) < user_addr_max())

/*
 * Test whether a block of memory is a valid user space address.
 * Returns 0 if the range is valid, nonzero otherwise.
 */
static inline bool __chk_range_not_ok(unsigned long addr, unsigned long size, unsigned long limit)
{
	/*
	 * If we have used "sizeof()" for the size,
	 * we know it won't overflow the limit (but
	 * it might overflow the 'addr', so it's
	 * important to subtract the size from the
	 * limit, not add it to the address).
	 */
	if (__builtin_constant_p(size))
		return unlikely(addr > limit - size);

	/* Arbitrary sizes? Be careful about overflow */
	addr += size;
	if (unlikely(addr < size))
		return true;
	return unlikely(addr > limit);
}

#define __range_not_ok(addr, size, limit)				\
({									\
	__chk_user_ptr(addr);						\
	__chk_range_not_ok((unsigned long __force)(addr), size, limit); \
})

#ifdef CONFIG_DEBUG_ATOMIC_SLEEP
# define WARN_ON_IN_IRQ()	WARN_ON_ONCE(!in_task())
#else
# define WARN_ON_IN_IRQ()
#endif

/**
 * access_ok: - Checks if a user space pointer is valid
 * @type: Type of access: %VERIFY_READ or %VERIFY_WRITE.  Note that
 *        %VERIFY_WRITE is a superset of %VERIFY_READ - if it is safe
 *        to write to a block, it is always safe to read from it.
 * @addr: User space pointer to start of block to check
 * @size: Size of block to check
 *
 * Context: User context only. This function may sleep if pagefaults are
 *          enabled.
 *
 * Checks if a pointer to a block of memory in user space is valid.
 *
 * Returns true (nonzero) if the memory block may be valid, false (zero)
 * if it is definitely invalid.
 *
 * Note that, depending on architecture, this function probably just
 * checks that the pointer is in the user space range - after calling
 * this function, memory access functions may still return -EFAULT.
 */
#define access_ok(type, addr, size)					\
({									\
	WARN_ON_IN_IRQ();						\
	likely(!__range_not_ok(addr, size, user_addr_max()));		\
})

/*
 * These are the main single-value transfer routines.  They automatically
 * use the right size if we just have the right pointer type.
 *
 * This gets kind of ugly. We want to return _two_ values in "get_user()"
 * and yet we don't want to do any pointers, because that is too much
 * of a performance impact. Thus we have a few rather ugly macros here,
 * and hide all the ugliness from the user.
 *
 * The "__xxx" versions of the user access functions are versions that
 * do not verify the address space, that must have been done previously
 * with a separate "access_ok()" call (this is used when we do multiple
 * accesses to the same area of user memory).
 */

extern int __get_user_1(void);
extern int __get_user_2(void);
extern int __get_user_4(void);
extern int __get_user_8(void);
extern int __get_user_bad(void);

#define __uaccess_begin() stac()
#define __uaccess_end()   clac()
#define __uaccess_begin_nospec()	\
({					\
	stac();				\
	barrier_nospec();		\
})

/*
 * This is a type: either unsigned long, if the argument fits into
 * that type, or otherwise unsigned long long.
 */
#define __inttype(x) \
__typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL))

/**
 * get_user: - Get a simple variable from user space.
 * @x:   Variable to store result.
 * @ptr: Source address, in user space.
 *
 * Context: User context only. This function may sleep if pagefaults are
 *          enabled.
 *
 * This macro copies a single simple variable from user space to kernel
 * space.  It supports simple types like char and int, but not larger
 * data types like structures or arrays.
 *
 * @ptr must have pointer-to-simple-variable type, and the result of
 * dereferencing @ptr must be assignable to @x without a cast.
 *
 * Returns zero on success, or -EFAULT on error.
 * On error, the variable @x is set to zero.
 */
/*
 * Careful: we have to cast the result to the type of the pointer
 * for sign reasons.
 *
 * The use of _ASM_DX as the register specifier is a bit of a
 * simplification, as gcc only cares about it as the starting point
 * and not size: for a 64-bit value it will use %ecx:%edx on 32 bits
 * (%ecx being the next register in gcc's x86 register sequence), and
 * %rdx on 64 bits.
 *
 * Clang/LLVM cares about the size of the register, but still wants
 * the base register for something that ends up being a pair.
 */
#define get_user(x, ptr)						\
({									\
	int __ret_gu;							\
	register __inttype(*(ptr)) __val_gu asm("%"_ASM_DX);		\
	__chk_user_ptr(ptr);						\
	might_fault();							\
	asm volatile("call __get_user_%P4"				\
		     : "=a" (__ret_gu), "=r" (__val_gu),		\
			ASM_CALL_CONSTRAINT				\
		     : "0" (ptr), "i" (sizeof(*(ptr))));		\
	(x) = (__force __typeof__(*(ptr))) __val_gu;			\
	__builtin_expect(__ret_gu, 0);					\
})

#define __put_user_x(size, x, ptr, __ret_pu)			\
	asm volatile("call __put_user_" #size : "=a" (__ret_pu)	\
		     : "0" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx")



#ifdef CONFIG_X86_32
#define __put_user_asm_u64(x, addr, err, errret)			\
	asm volatile("\n"						\
		     "1:	movl %%eax,0(%2)\n"			\
		     "2:	movl %%edx,4(%2)\n"			\
		     "3:"						\
		     ".section .fixup,\"ax\"\n"				\
		     "4:	movl %3,%0\n"				\
		     "	jmp 3b\n"					\
		     ".previous\n"					\
		     _ASM_EXTABLE(1b, 4b)				\
		     _ASM_EXTABLE(2b, 4b)				\
		     : "=r" (err)					\
		     : "A" (x), "r" (addr), "i" (errret), "0" (err))

#define __put_user_asm_ex_u64(x, addr)					\
	asm volatile("\n"						\
		     "1:	movl %%eax,0(%1)\n"			\
		     "2:	movl %%edx,4(%1)\n"			\
		     "3:"						\
		     _ASM_EXTABLE_EX(1b, 2b)				\
		     _ASM_EXTABLE_EX(2b, 3b)				\
		     : : "A" (x), "r" (addr))

#define __put_user_x8(x, ptr, __ret_pu)				\
	asm volatile("call __put_user_8" : "=a" (__ret_pu)	\
		     : "A" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx")
#else
#define __put_user_asm_u64(x, ptr, retval, errret) \
	__put_user_asm(x, ptr, retval, "q", "", "er", errret)
#define __put_user_asm_ex_u64(x, addr)	\
	__put_user_asm_ex(x, addr, "q", "", "er")
#define __put_user_x8(x, ptr, __ret_pu) __put_user_x(8, x, ptr, __ret_pu)
#endif

extern void __put_user_bad(void);

/*
 * Strange magic calling convention: pointer in %ecx,
 * value in %eax(:%edx), return value in %eax. clobbers %rbx
 */
extern void __put_user_1(void);
extern void __put_user_2(void);
extern void __put_user_4(void);
extern void __put_user_8(void);

/**
 * put_user: - Write a simple value into user space.
 * @x:   Value to copy to user space.
 * @ptr: Destination address, in user space.
 *
 * Context: User context only. This function may sleep if pagefaults are
 *          enabled.
 *
 * This macro copies a single simple value from kernel space to user
 * space.  It supports simple types like char and int, but not larger
 * data types like structures or arrays.
 *
 * @ptr must have pointer-to-simple-variable type, and @x must be assignable
 * to the result of dereferencing @ptr.
 *
 * Returns zero on success, or -EFAULT on error.
 */
#define put_user(x, ptr)					\
({								\
	int __ret_pu;						\
	__typeof__(*(ptr)) __pu_val;				\
	__chk_user_ptr(ptr);					\
	might_fault();						\
	__pu_val = x;						\
	switch (sizeof(*(ptr))) {				\
	case 1:							\
		__put_user_x(1, __pu_val, ptr, __ret_pu);	\
		break;						\
	case 2:							\
		__put_user_x(2, __pu_val, ptr, __ret_pu);	\
		break;						\
	case 4:							\
		__put_user_x(4, __pu_val, ptr, __ret_pu);	\
		break;						\
	case 8:							\
		__put_user_x8(__pu_val, ptr, __ret_pu);		\
		break;						\
	default:						\
		__put_user_x(X, __pu_val, ptr, __ret_pu);	\
		break;						\
	}							\
	__builtin_expect(__ret_pu, 0);				\
})

#define __put_user_size(x, ptr, size, retval, errret)			\
do {									\
	retval = 0;							\
	__chk_user_ptr(ptr);						\
	switch (size) {							\
	case 1:								\
		__put_user_asm(x, ptr, retval, "b", "b", "iq", errret);	\
		break;							\
	case 2:								\
		__put_user_asm(x, ptr, retval, "w", "w", "ir", errret);	\
		break;							\
	case 4:								\
		__put_user_asm(x, ptr, retval, "l", "k", "ir", errret);	\
		break;							\
	case 8:								\
		__put_user_asm_u64(x, ptr, retval, errret);		\
		break;							\
	default:							\
		__put_user_bad();					\
	}								\
} while (0)

/*
 * This doesn't do __uaccess_begin/end - the exception handling
 * around it must do that.
 */
#define __put_user_size_ex(x, ptr, size)				\
do {									\
	__chk_user_ptr(ptr);						\
	switch (size) {							\
	case 1:								\
		__put_user_asm_ex(x, ptr, "b", "b", "iq");		\
		break;							\
	case 2:								\
		__put_user_asm_ex(x, ptr, "w", "w", "ir");		\
		break;							\
	case 4:								\
		__put_user_asm_ex(x, ptr, "l", "k", "ir");		\
		break;							\
	case 8:								\
		__put_user_asm_ex_u64((__typeof__(*ptr))(x), ptr);	\
		break;							\
	default:							\
		__put_user_bad();					\
	}								\
} while (0)

#ifdef CONFIG_X86_32
#define __get_user_asm_u64(x, ptr, retval, errret)			\
({									\
	__typeof__(ptr) __ptr = (ptr);					\
	asm volatile("\n"					\
		     "1:	movl %2,%%eax\n"			\
		     "2:	movl %3,%%edx\n"			\
		     "3:\n"				\
		     ".section .fixup,\"ax\"\n"				\
		     "4:	mov %4,%0\n"				\
		     "	xorl %%eax,%%eax\n"				\
		     "	xorl %%edx,%%edx\n"				\
		     "	jmp 3b\n"					\
		     ".previous\n"					\
		     _ASM_EXTABLE(1b, 4b)				\
		     _ASM_EXTABLE(2b, 4b)				\
		     : "=r" (retval), "=&A"(x)				\
		     : "m" (__m(__ptr)), "m" __m(((u32 __user *)(__ptr)) + 1),	\
		       "i" (errret), "0" (retval));			\
})

#define __get_user_asm_ex_u64(x, ptr)			(x) = __get_user_bad()
#else
#define __get_user_asm_u64(x, ptr, retval, errret) \
	 __get_user_asm(x, ptr, retval, "q", "", "=r", errret)
#define __get_user_asm_ex_u64(x, ptr) \
	 __get_user_asm_ex(x, ptr, "q", "", "=r")
#endif

#define __get_user_size(x, ptr, size, retval, errret)			\
do {									\
	retval = 0;							\
	__chk_user_ptr(ptr);						\
	switch (size) {							\
	case 1:								\
		__get_user_asm(x, ptr, retval, "b", "b", "=q", errret);	\
		break;							\
	case 2:								\
		__get_user_asm(x, ptr, retval, "w", "w", "=r", errret);	\
		break;							\
	case 4:								\
		__get_user_asm(x, ptr, retval, "l", "k", "=r", errret);	\
		break;							\
	case 8:								\
		__get_user_asm_u64(x, ptr, retval, errret);		\
		break;							\
	default:							\
		(x) = __get_user_bad();					\
	}								\
} while (0)

#define __get_user_asm(x, addr, err, itype, rtype, ltype, errret)	\
	asm volatile("\n"						\
		     "1:	mov"itype" %2,%"rtype"1\n"		\
		     "2:\n"						\
		     ".section .fixup,\"ax\"\n"				\
		     "3:	mov %3,%0\n"				\
		     "	xor"itype" %"rtype"1,%"rtype"1\n"		\
		     "	jmp 2b\n"					\
		     ".previous\n"					\
		     _ASM_EXTABLE(1b, 3b)				\
		     : "=r" (err), ltype(x)				\
		     : "m" (__m(addr)), "i" (errret), "0" (err))

#define __get_user_asm_nozero(x, addr, err, itype, rtype, ltype, errret)	\
	asm volatile("\n"						\
		     "1:	mov"itype" %2,%"rtype"1\n"		\
		     "2:\n"						\
		     ".section .fixup,\"ax\"\n"				\
		     "3:	mov %3,%0\n"				\
		     "	jmp 2b\n"					\
		     ".previous\n"					\
		     _ASM_EXTABLE(1b, 3b)				\
		     : "=r" (err), ltype(x)				\
		     : "m" (__m(addr)), "i" (errret), "0" (err))

/*
 * This doesn't do __uaccess_begin/end - the exception handling
 * around it must do that.
 */
#define __get_user_size_ex(x, ptr, size)				\
do {									\
	__chk_user_ptr(ptr);						\
	switch (size) {							\
	case 1:								\
		__get_user_asm_ex(x, ptr, "b", "b", "=q");		\
		break;							\
	case 2:								\
		__get_user_asm_ex(x, ptr, "w", "w", "=r");		\
		break;							\
	case 4:								\
		__get_user_asm_ex(x, ptr, "l", "k", "=r");		\
		break;							\
	case 8:								\
		__get_user_asm_ex_u64(x, ptr);				\
		break;							\
	default:							\
		(x) = __get_user_bad();					\
	}								\
} while (0)

#define __get_user_asm_ex(x, addr, itype, rtype, ltype)			\
	asm volatile("1:	mov"itype" %1,%"rtype"0\n"		\
		     "2:\n"						\
		     ".section .fixup,\"ax\"\n"				\
                     "3:xor"itype" %"rtype"0,%"rtype"0\n"		\
		     "  jmp 2b\n"					\
		     ".previous\n"					\
		     _ASM_EXTABLE_EX(1b, 3b)				\
		     : ltype(x) : "m" (__m(addr)))

#define __put_user_nocheck(x, ptr, size)			\
({								\
	int __pu_err;						\
	__typeof__(*(ptr)) __pu_val;				\
	__pu_val = x;						\
	__uaccess_begin();					\
	__put_user_size(__pu_val, (ptr), (size), __pu_err, -EFAULT);\
	__uaccess_end();					\
	__builtin_expect(__pu_err, 0);				\
})

#define __get_user_nocheck(x, ptr, size)				\
({									\
	int __gu_err;							\
	__inttype(*(ptr)) __gu_val;					\
	__typeof__(ptr) __gu_ptr = (ptr);				\
	__typeof__(size) __gu_size = (size);				\
	__uaccess_begin_nospec();					\
	__get_user_size(__gu_val, __gu_ptr, __gu_size, __gu_err, -EFAULT);	\
	__uaccess_end();						\
	(x) = (__force __typeof__(*(ptr)))__gu_val;			\
	__builtin_expect(__gu_err, 0);					\
})

/* FIXME: this hack is definitely wrong -AK */
struct __large_struct { unsigned long buf[100]; };
#define __m(x) (*(struct __large_struct __user *)(x))

/*
 * Tell gcc we read from memory instead of writing: this is because
 * we do not write to any memory gcc knows about, so there are no
 * aliasing issues.
 */
#define __put_user_asm(x, addr, err, itype, rtype, ltype, errret)	\
	asm volatile("\n"						\
		     "1:	mov"itype" %"rtype"1,%2\n"		\
		     "2:\n"						\
		     ".section .fixup,\"ax\"\n"				\
		     "3:	mov %3,%0\n"				\
		     "	jmp 2b\n"					\
		     ".previous\n"					\
		     _ASM_EXTABLE(1b, 3b)				\
		     : "=r"(err)					\
		     : ltype(x), "m" (__m(addr)), "i" (errret), "0" (err))

#define __put_user_asm_ex(x, addr, itype, rtype, ltype)			\
	asm volatile("1:	mov"itype" %"rtype"0,%1\n"		\
		     "2:\n"						\
		     _ASM_EXTABLE_EX(1b, 2b)				\
		     : : ltype(x), "m" (__m(addr)))

/*
 * uaccess_try and catch
 */
#define uaccess_try	do {						\
	current->thread.uaccess_err = 0;				\
	__uaccess_begin();						\
	barrier();

#define uaccess_try_nospec do {						\
	current->thread.uaccess_err = 0;				\
	__uaccess_begin_nospec();					\

#define uaccess_catch(err)						\
	__uaccess_end();						\
	(err) |= (current->thread.uaccess_err ? -EFAULT : 0);		\
} while (0)

/**
 * __get_user: - Get a simple variable from user space, with less checking.
 * @x:   Variable to store result.
 * @ptr: Source address, in user space.
 *
 * Context: User context only. This function may sleep if pagefaults are
 *          enabled.
 *
 * This macro copies a single simple variable from user space to kernel
 * space.  It supports simple types like char and int, but not larger
 * data types like structures or arrays.
 *
 * @ptr must have pointer-to-simple-variable type, and the result of
 * dereferencing @ptr must be assignable to @x without a cast.
 *
 * Caller must check the pointer with access_ok() before calling this
 * function.
 *
 * Returns zero on success, or -EFAULT on error.
 * On error, the variable @x is set to zero.
 */

#define __get_user(x, ptr)						\
	__get_user_nocheck((x), (ptr), sizeof(*(ptr)))

/**
 * __put_user: - Write a simple value into user space, with less checking.
 * @x:   Value to copy to user space.
 * @ptr: Destination address, in user space.
 *
 * Context: User context only. This function may sleep if pagefaults are
 *          enabled.
 *
 * This macro copies a single simple value from kernel space to user
 * space.  It supports simple types like char and int, but not larger
 * data types like structures or arrays.
 *
 * @ptr must have pointer-to-simple-variable type, and @x must be assignable
 * to the result of dereferencing @ptr.
 *
 * Caller must check the pointer with access_ok() before calling this
 * function.
 *
 * Returns zero on success, or -EFAULT on error.
 */

#define __put_user(x, ptr)						\
	__put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))

/*
 * {get|put}_user_try and catch
 *
 * get_user_try {
 *	get_user_ex(...);
 * } get_user_catch(err)
 */
#define get_user_try		uaccess_try_nospec
#define get_user_catch(err)	uaccess_catch(err)

#define get_user_ex(x, ptr)	do {					\
	unsigned long __gue_val;					\
	__get_user_size_ex((__gue_val), (ptr), (sizeof(*(ptr))));	\
	(x) = (__force __typeof__(*(ptr)))__gue_val;			\
} while (0)

#define put_user_try		uaccess_try
#define put_user_catch(err)	uaccess_catch(err)

#define put_user_ex(x, ptr)						\
	__put_user_size_ex((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))

extern unsigned long
copy_from_user_nmi(void *to, const void __user *from, unsigned long n);
extern __must_check long
strncpy_from_user(char *dst, const char __user *src, long count);

extern __must_check long strnlen_user(const char __user *str, long n);

unsigned long __must_check clear_user(void __user *mem, unsigned long len);
unsigned long __must_check __clear_user(void __user *mem, unsigned long len);

extern void __cmpxchg_wrong_size(void)
	__compiletime_error("Bad argument size for cmpxchg");

#define __user_atomic_cmpxchg_inatomic(uval, ptr, old, new, size)	\
({									\
	int __ret = 0;							\
	__typeof__(ptr) __uval = (uval);				\
	__typeof__(*(ptr)) __old = (old);				\
	__typeof__(*(ptr)) __new = (new);				\
	__uaccess_begin_nospec();					\
	switch (size) {							\
	case 1:								\
	{								\
		asm volatile("\n"					\
			"1:\t" LOCK_PREFIX "cmpxchgb %4, %2\n"		\
			"2:\n"						\
			"\t.section .fixup, \"ax\"\n"			\
			"3:\tmov     %3, %0\n"				\
			"\tjmp     2b\n"				\
			"\t.previous\n"					\
			_ASM_EXTABLE(1b, 3b)				\
			: "+r" (__ret), "=a" (__old), "+m" (*(ptr))	\
			: "i" (-EFAULT), "q" (__new), "1" (__old)	\
			: "memory"					\
		);							\
		break;							\
	}								\
	case 2:								\
	{								\
		asm volatile("\n"					\
			"1:\t" LOCK_PREFIX "cmpxchgw %4, %2\n"		\
			"2:\n"						\
			"\t.section .fixup, \"ax\"\n"			\
			"3:\tmov     %3, %0\n"				\
			"\tjmp     2b\n"				\
			"\t.previous\n"					\
			_ASM_EXTABLE(1b, 3b)				\
			: "+r" (__ret), "=a" (__old), "+m" (*(ptr))	\
			: "i" (-EFAULT), "r" (__new), "1" (__old)	\
			: "memory"					\
		);							\
		break;							\
	}								\
	case 4:								\
	{								\
		asm volatile("\n"					\
			"1:\t" LOCK_PREFIX "cmpxchgl %4, %2\n"		\
			"2:\n"						\
			"\t.section .fixup, \"ax\"\n"			\
			"3:\tmov     %3, %0\n"				\
			"\tjmp     2b\n"				\
			"\t.previous\n"					\
			_ASM_EXTABLE(1b, 3b)				\
			: "+r" (__ret), "=a" (__old), "+m" (*(ptr))	\
			: "i" (-EFAULT), "r" (__new), "1" (__old)	\
			: "memory"					\
		);							\
		break;							\
	}								\
	case 8:								\
	{								\
		if (!IS_ENABLED(CONFIG_X86_64))				\
			__cmpxchg_wrong_size();				\
									\
		asm volatile("\n"					\
			"1:\t" LOCK_PREFIX "cmpxchgq %4, %2\n"		\
			"2:\n"						\
			"\t.section .fixup, \"ax\"\n"			\
			"3:\tmov     %3, %0\n"				\
			"\tjmp     2b\n"				\
			"\t.previous\n"					\
			_ASM_EXTABLE(1b, 3b)				\
			: "+r" (__ret), "=a" (__old), "+m" (*(ptr))	\
			: "i" (-EFAULT), "r" (__new), "1" (__old)	\
			: "memory"					\
		);							\
		break;							\
	}								\
	default:							\
		__cmpxchg_wrong_size();					\
	}								\
	__uaccess_end();						\
	*__uval = __old;						\
	__ret;								\
})

#define user_atomic_cmpxchg_inatomic(uval, ptr, old, new)		\
({									\
	access_ok(VERIFY_WRITE, (ptr), sizeof(*(ptr))) ?		\
		__user_atomic_cmpxchg_inatomic((uval), (ptr),		\
				(old), (new), sizeof(*(ptr))) :		\
		-EFAULT;						\
})

/*
 * movsl can be slow when source and dest are not both 8-byte aligned
 */
#ifdef CONFIG_X86_INTEL_USERCOPY
extern struct movsl_mask {
	int mask;
} ____cacheline_aligned_in_smp movsl_mask;
#endif

#define ARCH_HAS_NOCACHE_UACCESS 1

#ifdef CONFIG_X86_32
# include <asm/uaccess_32.h>
#else
# include <asm/uaccess_64.h>
#endif

/*
 * We rely on the nested NMI work to allow atomic faults from the NMI path; the
 * nested NMI paths are careful to preserve CR2.
 *
 * Caller must use pagefault_enable/disable, or run in interrupt context,
 * and also do a uaccess_ok() check
 */
#define __copy_from_user_nmi __copy_from_user_inatomic

/*
 * The "unsafe" user accesses aren't really "unsafe", but the naming
 * is a big fat warning: you have to not only do the access_ok()
 * checking before using them, but you have to surround them with the
 * user_access_begin/end() pair.
 */
static __must_check inline bool user_access_begin(int type,
						  const void __user *ptr,
						  size_t len)
{
	if (unlikely(!access_ok(type, ptr, len)))
		return 0;
	__uaccess_begin_nospec();
	return 1;
}

#define user_access_begin(a, b, c)	user_access_begin(a, b, c)
#define user_access_end()	__uaccess_end()

#define unsafe_put_user(x, ptr, err_label)					\
do {										\
	int __pu_err;								\
	__typeof__(*(ptr)) __pu_val = (x);					\
	__put_user_size(__pu_val, (ptr), sizeof(*(ptr)), __pu_err, -EFAULT);	\
	if (unlikely(__pu_err)) goto err_label;					\
} while (0)

#define unsafe_get_user(x, ptr, err_label)					\
do {										\
	int __gu_err;								\
	__inttype(*(ptr)) __gu_val;						\
	__get_user_size(__gu_val, (ptr), sizeof(*(ptr)), __gu_err, -EFAULT);	\
	(x) = (__force __typeof__(*(ptr)))__gu_val;				\
	if (unlikely(__gu_err)) goto err_label;					\
} while (0)

#endif /* _ASM_X86_UACCESS_H */


Filemanager

Name Type Size Permission Actions
crypto Folder 0755
e820 Folder 0755
fpu Folder 0755
numachip Folder 0755
trace Folder 0755
uv Folder 0755
xen Folder 0755
Kbuild File 294 B 0644
a.out-core.h File 1.89 KB 0644
acenv.h File 1.56 KB 0644
acpi.h File 4.76 KB 0644
agp.h File 1.04 KB 0644
alternative-asm.h File 2.43 KB 0644
alternative.h File 8.28 KB 0644
amd_nb.h File 2.98 KB 0644
apb_timer.h File 1.43 KB 0644
apic.h File 14.53 KB 0644
apic_flat_64.h File 151 B 0644
apicdef.h File 11.26 KB 0644
apm.h File 1.8 KB 0644
arch_hweight.h File 1.28 KB 0644
archrandom.h File 3.03 KB 0644
asm-offsets.h File 35 B 0644
asm-prototypes.h File 946 B 0644
asm.h File 4.97 KB 0644
atomic.h File 6.02 KB 0644
atomic64_32.h File 8.71 KB 0644
atomic64_64.h File 6.31 KB 0644
barrier.h File 3.6 KB 0644
bios_ebda.h File 914 B 0644
bitops.h File 13.78 KB 0644
boot.h File 1.53 KB 0644
bootparam_utils.h File 2.86 KB 0644
bug.h File 2.07 KB 0644
bugs.h File 493 B 0644
cache.h File 641 B 0644
cacheflush.h File 306 B 0644
cacheinfo.h File 209 B 0644
calgary.h File 2.31 KB 0644
ce4100.h File 121 B 0644
checksum.h File 133 B 0644
checksum_32.h File 4.86 KB 0644
checksum_64.h File 5.41 KB 0644
clocksource.h File 488 B 0644
cmdline.h File 302 B 0644
cmpxchg.h File 7.68 KB 0644
cmpxchg_32.h File 3.15 KB 0644
cmpxchg_64.h File 543 B 0644
compat.h File 7.37 KB 0644
cpu.h File 975 B 0644
cpu_device_id.h File 1.38 KB 0644
cpu_entry_area.h File 2.27 KB 0644
cpufeature.h File 7.75 KB 0644
cpufeatures.h File 24.62 KB 0644
cpumask.h File 408 B 0644
crash.h File 320 B 0644
current.h File 443 B 0644
debugreg.h File 2.67 KB 0644
delay.h File 208 B 0644
desc.h File 11.42 KB 0644
desc_defs.h File 3.16 KB 0644
device.h File 568 B 0644
disabled-features.h File 2.31 KB 0644
div64.h File 1.79 KB 0644
dma-mapping.h File 2.4 KB 0644
dma.h File 9.58 KB 0644
dmi.h File 556 B 0644
dwarf2.h File 2.43 KB 0644
edac.h File 474 B 0644
efi.h File 6.9 KB 0644
elf.h File 10.82 KB 0644
emergency-restart.h File 202 B 0644
entry_arch.h File 1.88 KB 0644
espfix.h File 426 B 0644
exec.h File 37 B 0644
export.h File 120 B 0644
extable.h File 1.27 KB 0644
fb.h File 540 B 0644
fixmap.h File 6.04 KB 0644
floppy.h File 6.59 KB 0644
frame.h File 815 B 0644
ftrace.h File 1.8 KB 0644
futex.h File 2.2 KB 0644
gart.h File 2.64 KB 0644
genapic.h File 22 B 0644
geode.h File 842 B 0644
hardirq.h File 2.3 KB 0644
highmem.h File 2.6 KB 0644
hpet.h File 3.38 KB 0644
hugetlb.h File 2.15 KB 0644
hw_breakpoint.h File 1.96 KB 0644
hw_irq.h File 3.85 KB 0644
hypervisor.h File 1.84 KB 0644
i8259.h File 1.93 KB 0644
ia32.h File 1.46 KB 0644
ia32_unistd.h File 313 B 0644
imr.h File 1.81 KB 0644
inat.h File 6.58 KB 0644
inat_types.h File 1013 B 0644
init.h File 632 B 0644
insn-eval.h File 837 B 0644
insn.h File 7.46 KB 0644
inst.h File 5.07 KB 0644
intel-family.h File 3.29 KB 0644
intel-mid.h File 4.91 KB 0644
intel_ds.h File 793 B 0644
intel_mid_vrtc.h File 326 B 0644
intel_pmc_ipc.h File 2.08 KB 0644
intel_pt.h File 292 B 0644
intel_punit_ipc.h File 4.56 KB 0644
intel_rdt_sched.h File 2.59 KB 0644
intel_scu_ipc.h File 2.3 KB 0644
intel_telemetry.h File 3.96 KB 0644
invpcid.h File 1.57 KB 0644
io.h File 12.21 KB 0644
io_apic.h File 5.63 KB 0644
iomap.h File 1.22 KB 0644
iommu.h File 392 B 0644
iommu_table.h File 3.82 KB 0644
iosf_mbi.h File 5.74 KB 0644
ipi.h File 2.84 KB 0644
irq.h File 1.12 KB 0644
irq_regs.h File 679 B 0644
irq_remapping.h File 2.96 KB 0644
irq_vectors.h File 4.12 KB 0644
irq_work.h File 397 B 0644
irqdomain.h File 1.61 KB 0644
irqflags.h File 4.38 KB 0644
ist.h File 735 B 0644
jump_label.h File 2.44 KB 0644
kasan.h File 966 B 0644
kaslr.h File 424 B 0644
kbdleds.h File 454 B 0644
kdebug.h File 752 B 0644
kexec-bzimage64.h File 189 B 0644
kexec.h File 6.69 KB 0644
kgdb.h File 2.09 KB 0644
kmap_types.h File 289 B 0644
kprobes.h File 3.82 KB 0644
kvm_emulate.h File 15.23 KB 0644
kvm_guest.h File 172 B 0644
kvm_host.h File 42.72 KB 0644
kvm_page_track.h File 2.48 KB 0644
kvm_para.h File 3 KB 0644
kvmclock.h File 170 B 0644
linkage.h File 581 B 0644
livepatch.h File 1.12 KB 0644
local.h File 3.83 KB 0644
local64.h File 33 B 0644
mach_timer.h File 1.55 KB 0644
mach_traps.h File 1013 B 0644
math_emu.h File 395 B 0644
mc146818rtc.h File 2.76 KB 0644
mce.h File 12.54 KB 0644
mem_encrypt.h File 2.83 KB 0644
microcode.h File 4.14 KB 0644
microcode_amd.h File 1.41 KB 0644
microcode_intel.h File 2.46 KB 0644
misc.h File 143 B 0644
mmconfig.h File 374 B 0644
mmu.h File 1.57 KB 0644
mmu_context.h File 10.27 KB 0644
mmx.h File 337 B 0644
mmzone.h File 129 B 0644
mmzone_32.h File 1.16 KB 0644
mmzone_64.h File 430 B 0644
module.h File 2.05 KB 0644
mpspec.h File 3.93 KB 0644
mpspec_def.h File 3.93 KB 0644
mpx.h File 2.97 KB 0644
mshyperv.h File 10.69 KB 0644
msi.h File 392 B 0644
msidef.h File 1.77 KB 0644
msr-index.h File 30.36 KB 0644
msr-trace.h File 1.35 KB 0644
msr.h File 10.85 KB 0644
mtrr.h File 4.62 KB 0644
mwait.h File 3.74 KB 0644
nmi.h File 1.39 KB 0644
nops.h File 4.31 KB 0644
nospec-branch.h File 10.87 KB 0644
numa.h File 2.18 KB 0644
numa_32.h File 256 B 0644
olpc.h File 3.16 KB 0644
olpc_ofw.h File 1.1 KB 0644
orc_lookup.h File 1.63 KB 0644
orc_types.h File 3.47 KB 0644
page.h File 2.18 KB 0644
page_32.h File 1.01 KB 0644
page_32_types.h File 1.7 KB 0644
page_64.h File 1.42 KB 0644
page_64_types.h File 2.34 KB 0644
page_types.h File 2.29 KB 0644
paravirt.h File 23.31 KB 0644
paravirt_types.h File 22.15 KB 0644
parport.h File 314 B 0644
pat.h File 768 B 0644
pci-direct.h File 995 B 0644
pci-functions.h File 654 B 0644
pci.h File 3.51 KB 0644
pci_64.h File 684 B 0644
pci_x86.h File 5.71 KB 0644
percpu.h File 18.97 KB 0644
perf_event.h File 8.82 KB 0644
perf_event_p4.h File 26.1 KB 0644
pgalloc.h File 5.57 KB 0644
pgtable-2level.h File 2.75 KB 0644
pgtable-2level_types.h File 867 B 0644
pgtable-3level.h File 10.24 KB 0644
pgtable-3level_types.h File 1.06 KB 0644
pgtable-invert.h File 1.07 KB 0644
pgtable.h File 33.91 KB 0644
pgtable_32.h File 3.1 KB 0644
pgtable_32_types.h File 2.01 KB 0644
pgtable_64.h File 7.37 KB 0644
pgtable_64_types.h File 3.67 KB 0644
pgtable_types.h File 16.75 KB 0644
pkeys.h File 3.17 KB 0644
platform_sst_audio.h File 3.18 KB 0644
pm-trace.h File 611 B 0644
posix_types.h File 144 B 0644
preempt.h File 3.04 KB 0644
probe_roms.h File 273 B 0644
processor-cyrix.h File 879 B 0644
processor-flags.h File 1.71 KB 0644
processor.h File 24.54 KB 0644
prom.h File 1 KB 0644
proto.h File 1003 B 0644
pti.h File 369 B 0644
ptrace.h File 8.52 KB 0644
purgatory.h File 571 B 0644
pvclock-abi.h File 1.49 KB 0644
pvclock.h File 2.64 KB 0644
qrwlock.h File 199 B 0644
qspinlock.h File 2.54 KB 0644
qspinlock_paravirt.h File 1.85 KB 0644
realmode.h File 1.76 KB 0644
reboot.h File 850 B 0644
reboot_fixups.h File 183 B 0644
refcount.h File 2.83 KB 0644
required-features.h File 2.81 KB 0644
rio.h File 2.57 KB 0644
rmwcc.h File 1.62 KB 0644
rwsem.h File 7.02 KB 0644
seccomp.h File 510 B 0644
sections.h File 465 B 0644
segment.h File 9.47 KB 0644
serial.h File 1.11 KB 0644
set_memory.h File 3.86 KB 0644
setup.h File 3.4 KB 0644
setup_arch.h File 77 B 0644
shmparam.h File 193 B 0644
sigcontext.h File 261 B 0644
sigframe.h File 2.25 KB 0644
sighandling.h File 649 B 0644
signal.h File 2.37 KB 0644
simd.h File 287 B 0644
smap.h File 1.71 KB 0644
smp.h File 4.73 KB 0644
sparsemem.h File 1.01 KB 0644
spec-ctrl.h File 2.81 KB 0644
special_insns.h File 5.04 KB 0644
spinlock.h File 1.19 KB 0644
spinlock_types.h File 719 B 0644
sta2x11.h File 352 B 0644
stackprotector.h File 4.13 KB 0644
stacktrace.h File 2.57 KB 0644
string.h File 129 B 0644
string_32.h File 7.74 KB 0644
string_64.h File 3.56 KB 0644
suspend.h File 131 B 0644
suspend_32.h File 822 B 0644
suspend_64.h File 1.79 KB 0644
svm.h File 7.06 KB 0644
swiotlb.h File 991 B 0644
switch_to.h File 2.98 KB 0644
sync_bitops.h File 3.42 KB 0644
sys_ia32.h File 1.8 KB 0644
syscall.h File 5.14 KB 0644
syscalls.h File 1.39 KB 0644
sysfb.h File 2.54 KB 0644
tce.h File 1.68 KB 0644
text-patching.h File 2.3 KB 0644
thread_info.h File 9.33 KB 0644
time.h File 331 B 0644
timer.h File 1 KB 0644
timex.h File 546 B 0644
tlb.h File 1.05 KB 0644
tlbbatch.h File 332 B 0644
tlbflush.h File 17.09 KB 0644
topology.h File 4.84 KB 0644
trace_clock.h File 406 B 0644
traps.h File 5.74 KB 0644
tsc.h File 1.93 KB 0644
uaccess.h File 21.69 KB 0644
uaccess_32.h File 1.54 KB 0644
uaccess_64.h File 5.32 KB 0644
umip.h File 329 B 0644
unaligned.h File 345 B 0644
unistd.h File 1.45 KB 0644
unwind.h File 3.13 KB 0644
unwind_hints.h File 3.01 KB 0644
uprobes.h File 1.57 KB 0644
user.h File 2.2 KB 0644
user32.h File 2.11 KB 0644
user_32.h File 4.92 KB 0644
user_64.h File 5.21 KB 0644
vdso.h File 1.09 KB 0644
vga.h File 740 B 0644
vgtod.h File 2.13 KB 0644
virtext.h File 2.62 KB 0644
vm86.h File 2.16 KB 0644
vmx.h File 23.5 KB 0644
vsyscall.h File 635 B 0644
vvar.h File 1.38 KB 0644
word-at-a-time.h File 2.54 KB 0644
x86_init.h File 9.25 KB 0644
xor.h File 10.26 KB 0644
xor_32.h File 14.4 KB 0644
xor_64.h File 716 B 0644
xor_avx.h File 4.5 KB 0644