forked from Minki/linux
b9f705758a
Add an extra intermediate variable to __get_user and __put_user to give sparse an opportunity to detect mismatches. Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
606 lines
19 KiB
C
606 lines
19 KiB
C
/*
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*/
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#ifndef _ASM_TILE_UACCESS_H
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#define _ASM_TILE_UACCESS_H
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/*
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* User space memory access functions
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*/
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <asm-generic/uaccess-unaligned.h>
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#include <asm/processor.h>
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#include <asm/page.h>
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#define VERIFY_READ 0
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#define VERIFY_WRITE 1
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/*
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* The fs value determines whether argument validity checking should be
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* performed or not. If get_fs() == USER_DS, checking is performed, with
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* get_fs() == KERNEL_DS, checking is bypassed.
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*
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* For historical reasons, these macros are grossly misnamed.
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*/
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#define MAKE_MM_SEG(a) ((mm_segment_t) { (a) })
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#define KERNEL_DS MAKE_MM_SEG(-1UL)
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#define USER_DS MAKE_MM_SEG(PAGE_OFFSET)
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#define get_ds() (KERNEL_DS)
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#define get_fs() (current_thread_info()->addr_limit)
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#define set_fs(x) (current_thread_info()->addr_limit = (x))
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#define segment_eq(a, b) ((a).seg == (b).seg)
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#ifndef __tilegx__
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/*
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* We could allow mapping all 16 MB at 0xfc000000, but we set up a
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* special hack in arch_setup_additional_pages() to auto-create a mapping
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* for the first 16 KB, and it would seem strange to have different
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* user-accessible semantics for memory at 0xfc000000 and above 0xfc004000.
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*/
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static inline int is_arch_mappable_range(unsigned long addr,
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unsigned long size)
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{
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return (addr >= MEM_USER_INTRPT &&
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addr < (MEM_USER_INTRPT + INTRPT_SIZE) &&
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size <= (MEM_USER_INTRPT + INTRPT_SIZE) - addr);
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}
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#define is_arch_mappable_range is_arch_mappable_range
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#else
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#define is_arch_mappable_range(addr, size) 0
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#endif
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/*
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* Test whether a block of memory is a valid user space address.
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* Returns 0 if the range is valid, nonzero otherwise.
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*/
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int __range_ok(unsigned long addr, unsigned long size);
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/**
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* access_ok: - Checks if a user space pointer is valid
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* @type: Type of access: %VERIFY_READ or %VERIFY_WRITE. Note that
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* %VERIFY_WRITE is a superset of %VERIFY_READ - if it is safe
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* to write to a block, it is always safe to read from it.
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* @addr: User space pointer to start of block to check
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* @size: Size of block to check
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*
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* Context: User context only. This function may sleep.
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*
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* Checks if a pointer to a block of memory in user space is valid.
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*
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* Returns true (nonzero) if the memory block may be valid, false (zero)
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* if it is definitely invalid.
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*
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* Note that, depending on architecture, this function probably just
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* checks that the pointer is in the user space range - after calling
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* this function, memory access functions may still return -EFAULT.
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*/
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#define access_ok(type, addr, size) ({ \
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__chk_user_ptr(addr); \
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likely(__range_ok((unsigned long)(addr), (size)) == 0); \
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})
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/*
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* The exception table consists of pairs of addresses: the first is the
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* address of an instruction that is allowed to fault, and the second is
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* the address at which the program should continue. No registers are
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* modified, so it is entirely up to the continuation code to figure out
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* what to do.
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*
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* All the routines below use bits of fixup code that are out of line
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* with the main instruction path. This means when everything is well,
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* we don't even have to jump over them. Further, they do not intrude
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* on our cache or tlb entries.
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*/
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struct exception_table_entry {
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unsigned long insn, fixup;
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};
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extern int fixup_exception(struct pt_regs *regs);
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/*
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* This is a type: either unsigned long, if the argument fits into
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* that type, or otherwise unsigned long long.
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*/
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#define __inttype(x) \
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__typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL))
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/*
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* Support macros for __get_user().
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* Note that __get_user() and __put_user() assume proper alignment.
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*/
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#ifdef __LP64__
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#define _ASM_PTR ".quad"
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#define _ASM_ALIGN ".align 8"
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#else
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#define _ASM_PTR ".long"
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#define _ASM_ALIGN ".align 4"
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#endif
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#define __get_user_asm(OP, x, ptr, ret) \
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asm volatile("1: {" #OP " %1, %2; movei %0, 0 }\n" \
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".pushsection .fixup,\"ax\"\n" \
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"0: { movei %1, 0; movei %0, %3 }\n" \
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"j 9f\n" \
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".section __ex_table,\"a\"\n" \
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_ASM_ALIGN "\n" \
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_ASM_PTR " 1b, 0b\n" \
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".popsection\n" \
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"9:" \
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: "=r" (ret), "=r" (x) \
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: "r" (ptr), "i" (-EFAULT))
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#ifdef __tilegx__
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#define __get_user_1(x, ptr, ret) __get_user_asm(ld1u, x, ptr, ret)
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#define __get_user_2(x, ptr, ret) __get_user_asm(ld2u, x, ptr, ret)
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#define __get_user_4(x, ptr, ret) __get_user_asm(ld4s, x, ptr, ret)
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#define __get_user_8(x, ptr, ret) __get_user_asm(ld, x, ptr, ret)
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#else
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#define __get_user_1(x, ptr, ret) __get_user_asm(lb_u, x, ptr, ret)
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#define __get_user_2(x, ptr, ret) __get_user_asm(lh_u, x, ptr, ret)
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#define __get_user_4(x, ptr, ret) __get_user_asm(lw, x, ptr, ret)
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#ifdef __LITTLE_ENDIAN
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#define __lo32(a, b) a
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#define __hi32(a, b) b
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#else
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#define __lo32(a, b) b
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#define __hi32(a, b) a
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#endif
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#define __get_user_8(x, ptr, ret) \
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({ \
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unsigned int __a, __b; \
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asm volatile("1: { lw %1, %3; addi %2, %3, 4 }\n" \
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"2: { lw %2, %2; movei %0, 0 }\n" \
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".pushsection .fixup,\"ax\"\n" \
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"0: { movei %1, 0; movei %2, 0 }\n" \
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"{ movei %0, %4; j 9f }\n" \
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".section __ex_table,\"a\"\n" \
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".align 4\n" \
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".word 1b, 0b\n" \
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".word 2b, 0b\n" \
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".popsection\n" \
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"9:" \
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: "=r" (ret), "=r" (__a), "=&r" (__b) \
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: "r" (ptr), "i" (-EFAULT)); \
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(x) = (__force __typeof(x))(__inttype(x)) \
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(((u64)__hi32(__a, __b) << 32) | \
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__lo32(__a, __b)); \
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})
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#endif
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extern int __get_user_bad(void)
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__attribute__((warning("sizeof __get_user argument not 1, 2, 4 or 8")));
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/**
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* __get_user: - Get a simple variable from user space, with less checking.
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* @x: Variable to store result.
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* @ptr: Source address, in user space.
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*
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* Context: User context only. This function may sleep.
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*
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* This macro copies a single simple variable from user space to kernel
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* space. It supports simple types like char and int, but not larger
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* data types like structures or arrays.
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*
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* @ptr must have pointer-to-simple-variable type, and the result of
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* dereferencing @ptr must be assignable to @x without a cast.
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*
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* Returns zero on success, or -EFAULT on error.
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* On error, the variable @x is set to zero.
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*
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* Caller must check the pointer with access_ok() before calling this
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* function.
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*/
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#define __get_user(x, ptr) \
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({ \
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int __ret; \
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typeof(x) _x; \
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__chk_user_ptr(ptr); \
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switch (sizeof(*(ptr))) { \
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case 1: __get_user_1(_x, ptr, __ret); break; \
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case 2: __get_user_2(_x, ptr, __ret); break; \
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case 4: __get_user_4(_x, ptr, __ret); break; \
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case 8: __get_user_8(_x, ptr, __ret); break; \
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default: __ret = __get_user_bad(); break; \
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} \
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(x) = (typeof(*(ptr))) _x; \
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__ret; \
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})
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/* Support macros for __put_user(). */
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#define __put_user_asm(OP, x, ptr, ret) \
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asm volatile("1: {" #OP " %1, %2; movei %0, 0 }\n" \
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".pushsection .fixup,\"ax\"\n" \
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"0: { movei %0, %3; j 9f }\n" \
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".section __ex_table,\"a\"\n" \
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_ASM_ALIGN "\n" \
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_ASM_PTR " 1b, 0b\n" \
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".popsection\n" \
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"9:" \
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: "=r" (ret) \
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: "r" (ptr), "r" (x), "i" (-EFAULT))
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#ifdef __tilegx__
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#define __put_user_1(x, ptr, ret) __put_user_asm(st1, x, ptr, ret)
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#define __put_user_2(x, ptr, ret) __put_user_asm(st2, x, ptr, ret)
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#define __put_user_4(x, ptr, ret) __put_user_asm(st4, x, ptr, ret)
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#define __put_user_8(x, ptr, ret) __put_user_asm(st, x, ptr, ret)
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#else
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#define __put_user_1(x, ptr, ret) __put_user_asm(sb, x, ptr, ret)
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#define __put_user_2(x, ptr, ret) __put_user_asm(sh, x, ptr, ret)
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#define __put_user_4(x, ptr, ret) __put_user_asm(sw, x, ptr, ret)
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#define __put_user_8(x, ptr, ret) \
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({ \
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u64 __x = (__force __inttype(x))(x); \
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int __lo = (int) __x, __hi = (int) (__x >> 32); \
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asm volatile("1: { sw %1, %2; addi %0, %1, 4 }\n" \
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"2: { sw %0, %3; movei %0, 0 }\n" \
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".pushsection .fixup,\"ax\"\n" \
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"0: { movei %0, %4; j 9f }\n" \
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".section __ex_table,\"a\"\n" \
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".align 4\n" \
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".word 1b, 0b\n" \
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".word 2b, 0b\n" \
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".popsection\n" \
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"9:" \
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: "=&r" (ret) \
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: "r" (ptr), "r" (__lo32(__lo, __hi)), \
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"r" (__hi32(__lo, __hi)), "i" (-EFAULT)); \
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})
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#endif
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extern int __put_user_bad(void)
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__attribute__((warning("sizeof __put_user argument not 1, 2, 4 or 8")));
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/**
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* __put_user: - Write a simple value into user space, with less checking.
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* @x: Value to copy to user space.
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* @ptr: Destination address, in user space.
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*
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* Context: User context only. This function may sleep.
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*
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* This macro copies a single simple value from kernel space to user
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* space. It supports simple types like char and int, but not larger
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* data types like structures or arrays.
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*
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* @ptr must have pointer-to-simple-variable type, and @x must be assignable
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* to the result of dereferencing @ptr.
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*
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* Caller must check the pointer with access_ok() before calling this
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* function.
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*
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* Returns zero on success, or -EFAULT on error.
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*/
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#define __put_user(x, ptr) \
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({ \
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int __ret; \
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typeof(*(ptr)) _x = (x); \
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__chk_user_ptr(ptr); \
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switch (sizeof(*(ptr))) { \
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case 1: __put_user_1(_x, ptr, __ret); break; \
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case 2: __put_user_2(_x, ptr, __ret); break; \
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case 4: __put_user_4(_x, ptr, __ret); break; \
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case 8: __put_user_8(_x, ptr, __ret); break; \
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default: __ret = __put_user_bad(); break; \
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} \
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__ret; \
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})
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/*
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* The versions of get_user and put_user without initial underscores
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* check the address of their arguments to make sure they are not
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* in kernel space.
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*/
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#define put_user(x, ptr) \
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({ \
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__typeof__(*(ptr)) __user *__Pu_addr = (ptr); \
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access_ok(VERIFY_WRITE, (__Pu_addr), sizeof(*(__Pu_addr))) ? \
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__put_user((x), (__Pu_addr)) : \
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-EFAULT; \
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})
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#define get_user(x, ptr) \
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({ \
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__typeof__(*(ptr)) const __user *__Gu_addr = (ptr); \
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access_ok(VERIFY_READ, (__Gu_addr), sizeof(*(__Gu_addr))) ? \
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__get_user((x), (__Gu_addr)) : \
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((x) = 0, -EFAULT); \
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})
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/**
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* __copy_to_user() - copy data into user space, with less checking.
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* @to: Destination address, in user space.
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* @from: Source address, in kernel space.
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* @n: Number of bytes to copy.
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*
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* Context: User context only. This function may sleep.
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*
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* Copy data from kernel space to user space. Caller must check
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* the specified block with access_ok() before calling this function.
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*
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* Returns number of bytes that could not be copied.
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* On success, this will be zero.
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*
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* An alternate version - __copy_to_user_inatomic() - is designed
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* to be called from atomic context, typically bracketed by calls
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* to pagefault_disable() and pagefault_enable().
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*/
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extern unsigned long __must_check __copy_to_user_inatomic(
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void __user *to, const void *from, unsigned long n);
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static inline unsigned long __must_check
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__copy_to_user(void __user *to, const void *from, unsigned long n)
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{
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might_fault();
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return __copy_to_user_inatomic(to, from, n);
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}
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static inline unsigned long __must_check
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copy_to_user(void __user *to, const void *from, unsigned long n)
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{
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if (access_ok(VERIFY_WRITE, to, n))
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n = __copy_to_user(to, from, n);
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return n;
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}
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/**
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* __copy_from_user() - copy data from user space, with less checking.
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* @to: Destination address, in kernel space.
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* @from: Source address, in user space.
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* @n: Number of bytes to copy.
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*
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* Context: User context only. This function may sleep.
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*
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* Copy data from user space to kernel space. Caller must check
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* the specified block with access_ok() before calling this function.
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*
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* Returns number of bytes that could not be copied.
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* On success, this will be zero.
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*
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* If some data could not be copied, this function will pad the copied
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* data to the requested size using zero bytes.
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*
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* An alternate version - __copy_from_user_inatomic() - is designed
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* to be called from atomic context, typically bracketed by calls
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* to pagefault_disable() and pagefault_enable(). This version
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* does *NOT* pad with zeros.
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*/
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extern unsigned long __must_check __copy_from_user_inatomic(
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void *to, const void __user *from, unsigned long n);
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extern unsigned long __must_check __copy_from_user_zeroing(
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void *to, const void __user *from, unsigned long n);
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static inline unsigned long __must_check
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__copy_from_user(void *to, const void __user *from, unsigned long n)
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{
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might_fault();
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return __copy_from_user_zeroing(to, from, n);
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}
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static inline unsigned long __must_check
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_copy_from_user(void *to, const void __user *from, unsigned long n)
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{
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if (access_ok(VERIFY_READ, from, n))
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n = __copy_from_user(to, from, n);
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else
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memset(to, 0, n);
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return n;
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}
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#ifdef CONFIG_DEBUG_STRICT_USER_COPY_CHECKS
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/*
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* There are still unprovable places in the generic code as of 2.6.34, so this
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* option is not really compatible with -Werror, which is more useful in
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* general.
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*/
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extern void copy_from_user_overflow(void)
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__compiletime_warning("copy_from_user() size is not provably correct");
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static inline unsigned long __must_check copy_from_user(void *to,
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const void __user *from,
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unsigned long n)
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{
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int sz = __compiletime_object_size(to);
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if (likely(sz == -1 || sz >= n))
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n = _copy_from_user(to, from, n);
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else
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copy_from_user_overflow();
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return n;
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}
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#else
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#define copy_from_user _copy_from_user
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#endif
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#ifdef __tilegx__
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/**
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* __copy_in_user() - copy data within user space, with less checking.
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* @to: Destination address, in user space.
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* @from: Source address, in user space.
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* @n: Number of bytes to copy.
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*
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* Context: User context only. This function may sleep.
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*
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* Copy data from user space to user space. Caller must check
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* the specified blocks with access_ok() before calling this function.
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*
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* Returns number of bytes that could not be copied.
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* On success, this will be zero.
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*/
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extern unsigned long __copy_in_user_inatomic(
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void __user *to, const void __user *from, unsigned long n);
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static inline unsigned long __must_check
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__copy_in_user(void __user *to, const void __user *from, unsigned long n)
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{
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might_fault();
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return __copy_in_user_inatomic(to, from, n);
|
|
}
|
|
|
|
static inline unsigned long __must_check
|
|
copy_in_user(void __user *to, const void __user *from, unsigned long n)
|
|
{
|
|
if (access_ok(VERIFY_WRITE, to, n) && access_ok(VERIFY_READ, from, n))
|
|
n = __copy_in_user(to, from, n);
|
|
return n;
|
|
}
|
|
#endif
|
|
|
|
|
|
/**
|
|
* strlen_user: - Get the size of a string in user space.
|
|
* @str: The string to measure.
|
|
*
|
|
* Context: User context only. This function may sleep.
|
|
*
|
|
* Get the size of a NUL-terminated string in user space.
|
|
*
|
|
* Returns the size of the string INCLUDING the terminating NUL.
|
|
* On exception, returns 0.
|
|
*
|
|
* If there is a limit on the length of a valid string, you may wish to
|
|
* consider using strnlen_user() instead.
|
|
*/
|
|
extern long strnlen_user_asm(const char __user *str, long n);
|
|
static inline long __must_check strnlen_user(const char __user *str, long n)
|
|
{
|
|
might_fault();
|
|
return strnlen_user_asm(str, n);
|
|
}
|
|
#define strlen_user(str) strnlen_user(str, LONG_MAX)
|
|
|
|
/**
|
|
* strncpy_from_user: - Copy a NUL terminated string from userspace, with less checking.
|
|
* @dst: Destination address, in kernel space. This buffer must be at
|
|
* least @count bytes long.
|
|
* @src: Source address, in user space.
|
|
* @count: Maximum number of bytes to copy, including the trailing NUL.
|
|
*
|
|
* Copies a NUL-terminated string from userspace to kernel space.
|
|
* Caller must check the specified block with access_ok() before calling
|
|
* this function.
|
|
*
|
|
* On success, returns the length of the string (not including the trailing
|
|
* NUL).
|
|
*
|
|
* If access to userspace fails, returns -EFAULT (some data may have been
|
|
* copied).
|
|
*
|
|
* If @count is smaller than the length of the string, copies @count bytes
|
|
* and returns @count.
|
|
*/
|
|
extern long strncpy_from_user_asm(char *dst, const char __user *src, long);
|
|
static inline long __must_check __strncpy_from_user(
|
|
char *dst, const char __user *src, long count)
|
|
{
|
|
might_fault();
|
|
return strncpy_from_user_asm(dst, src, count);
|
|
}
|
|
static inline long __must_check 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);
|
|
return -EFAULT;
|
|
}
|
|
|
|
/**
|
|
* clear_user: - Zero a block of memory in user space.
|
|
* @mem: Destination address, in user space.
|
|
* @len: Number of bytes to zero.
|
|
*
|
|
* Zero a block of memory in user space.
|
|
*
|
|
* Returns number of bytes that could not be cleared.
|
|
* On success, this will be zero.
|
|
*/
|
|
extern unsigned long clear_user_asm(void __user *mem, unsigned long len);
|
|
static inline unsigned long __must_check __clear_user(
|
|
void __user *mem, unsigned long len)
|
|
{
|
|
might_fault();
|
|
return clear_user_asm(mem, len);
|
|
}
|
|
static inline unsigned long __must_check clear_user(
|
|
void __user *mem, unsigned long len)
|
|
{
|
|
if (access_ok(VERIFY_WRITE, mem, len))
|
|
return __clear_user(mem, len);
|
|
return len;
|
|
}
|
|
|
|
/**
|
|
* flush_user: - Flush a block of memory in user space from cache.
|
|
* @mem: Destination address, in user space.
|
|
* @len: Number of bytes to flush.
|
|
*
|
|
* Returns number of bytes that could not be flushed.
|
|
* On success, this will be zero.
|
|
*/
|
|
extern unsigned long flush_user_asm(void __user *mem, unsigned long len);
|
|
static inline unsigned long __must_check __flush_user(
|
|
void __user *mem, unsigned long len)
|
|
{
|
|
int retval;
|
|
|
|
might_fault();
|
|
retval = flush_user_asm(mem, len);
|
|
mb_incoherent();
|
|
return retval;
|
|
}
|
|
|
|
static inline unsigned long __must_check flush_user(
|
|
void __user *mem, unsigned long len)
|
|
{
|
|
if (access_ok(VERIFY_WRITE, mem, len))
|
|
return __flush_user(mem, len);
|
|
return len;
|
|
}
|
|
|
|
/**
|
|
* finv_user: - Flush-inval a block of memory in user space from cache.
|
|
* @mem: Destination address, in user space.
|
|
* @len: Number of bytes to invalidate.
|
|
*
|
|
* Returns number of bytes that could not be flush-invalidated.
|
|
* On success, this will be zero.
|
|
*/
|
|
extern unsigned long finv_user_asm(void __user *mem, unsigned long len);
|
|
static inline unsigned long __must_check __finv_user(
|
|
void __user *mem, unsigned long len)
|
|
{
|
|
int retval;
|
|
|
|
might_fault();
|
|
retval = finv_user_asm(mem, len);
|
|
mb_incoherent();
|
|
return retval;
|
|
}
|
|
static inline unsigned long __must_check finv_user(
|
|
void __user *mem, unsigned long len)
|
|
{
|
|
if (access_ok(VERIFY_WRITE, mem, len))
|
|
return __finv_user(mem, len);
|
|
return len;
|
|
}
|
|
|
|
#endif /* _ASM_TILE_UACCESS_H */
|