forked from mirrors/linux
736706bee3
Every in-kernel use of this function defined it to KERNEL_DS (either as an actual define, or as an inline function). It's an entirely historical artifact, and long long long ago used to actually read the segment selector valueof '%ds' on x86. Which in the kernel is always KERNEL_DS. Inspired by a patch from Jann Horn that just did this for a very small subset of users (the ones in fs/), along with Al who suggested a script. I then just took it to the logical extreme and removed all the remaining gunk. Roughly scripted with git grep -l '(get_ds())' -- :^tools/ | xargs sed -i 's/(get_ds())/(KERNEL_DS)/' git grep -lw 'get_ds' -- :^tools/ | xargs sed -i '/^#define get_ds()/d' plus manual fixups to remove a few unusual usage patterns, the couple of inline function cases and to fix up a comment that had become stale. The 'get_ds()' function remains in an x86 kvm selftest, since in user space it actually does something relevant. Inspired-by: Jann Horn <jannh@google.com> Inspired-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
791 lines
22 KiB
C
791 lines
22 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1996, 1997, 1998, 1999, 2000, 03, 04 by Ralf Baechle
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
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* Copyright (C) 2007 Maciej W. Rozycki
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* Copyright (C) 2014, Imagination Technologies Ltd.
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*/
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#ifndef _ASM_UACCESS_H
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#define _ASM_UACCESS_H
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <asm/asm-eva.h>
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#include <asm/extable.h>
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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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#ifdef CONFIG_32BIT
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#ifdef CONFIG_KVM_GUEST
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#define __UA_LIMIT 0x40000000UL
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#else
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#define __UA_LIMIT 0x80000000UL
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#endif
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#define __UA_ADDR ".word"
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#define __UA_LA "la"
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#define __UA_ADDU "addu"
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#define __UA_t0 "$8"
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#define __UA_t1 "$9"
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#endif /* CONFIG_32BIT */
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#ifdef CONFIG_64BIT
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extern u64 __ua_limit;
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#define __UA_LIMIT __ua_limit
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#define __UA_ADDR ".dword"
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#define __UA_LA "dla"
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#define __UA_ADDU "daddu"
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#define __UA_t0 "$12"
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#define __UA_t1 "$13"
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#endif /* CONFIG_64BIT */
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/*
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* USER_DS is a bitmask that has the bits set that may not be set in a valid
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* userspace address. Note that we limit 32-bit userspace to 0x7fff8000 but
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* the arithmetic we're doing only works if the limit is a power of two, so
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* we use 0x80000000 here on 32-bit kernels. If a process passes an invalid
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* address in this range it's the process's problem, not ours :-)
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*/
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#ifdef CONFIG_KVM_GUEST
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#define KERNEL_DS ((mm_segment_t) { 0x80000000UL })
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#define USER_DS ((mm_segment_t) { 0xC0000000UL })
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#else
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#define KERNEL_DS ((mm_segment_t) { 0UL })
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#define USER_DS ((mm_segment_t) { __UA_LIMIT })
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#endif
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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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/*
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* eva_kernel_access() - determine whether kernel memory access on an EVA system
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*
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* Determines whether memory accesses should be performed to kernel memory
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* on a system using Extended Virtual Addressing (EVA).
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*
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* Return: true if a kernel memory access on an EVA system, else false.
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*/
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static inline bool eva_kernel_access(void)
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{
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if (!IS_ENABLED(CONFIG_EVA))
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return false;
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return uaccess_kernel();
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}
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/*
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* Is a address valid? This does a straightforward calculation rather
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* than tests.
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*
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* Address valid if:
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* - "addr" doesn't have any high-bits set
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* - AND "size" doesn't have any high-bits set
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* - AND "addr+size" doesn't have any high-bits set
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* - OR we are in kernel mode.
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*
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* __ua_size() is a trick to avoid runtime checking of positive constant
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* sizes; for those we already know at compile time that the size is ok.
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*/
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#define __ua_size(size) \
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((__builtin_constant_p(size) && (signed long) (size) > 0) ? 0 : (size))
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/*
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* access_ok: - Checks if a user space pointer is valid
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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 if pagefaults are
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* enabled.
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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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static inline int __access_ok(const void __user *p, unsigned long size)
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{
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unsigned long addr = (unsigned long)p;
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return (get_fs().seg & (addr | (addr + size) | __ua_size(size))) == 0;
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}
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#define access_ok(addr, size) \
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likely(__access_ok((addr), (size)))
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/*
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* put_user: - Write a simple value into user space.
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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 if pagefaults are
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* enabled.
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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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* 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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__put_user_check((x), (ptr), sizeof(*(ptr)))
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/*
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* get_user: - Get a simple variable from user space.
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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 if pagefaults are
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* enabled.
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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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#define get_user(x,ptr) \
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__get_user_check((x), (ptr), sizeof(*(ptr)))
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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 if pagefaults are
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* enabled.
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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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__put_user_nocheck((x), (ptr), sizeof(*(ptr)))
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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 if pagefaults are
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* enabled.
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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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* 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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* On error, the variable @x is set to zero.
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*/
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#define __get_user(x,ptr) \
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__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
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struct __large_struct { unsigned long buf[100]; };
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#define __m(x) (*(struct __large_struct __user *)(x))
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/*
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* Yuck. We need two variants, one for 64bit operation and one
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* for 32 bit mode and old iron.
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*/
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#ifndef CONFIG_EVA
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#define __get_kernel_common(val, size, ptr) __get_user_common(val, size, ptr)
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#else
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/*
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* Kernel specific functions for EVA. We need to use normal load instructions
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* to read data from kernel when operating in EVA mode. We use these macros to
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* avoid redefining __get_user_asm for EVA.
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*/
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#undef _loadd
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#undef _loadw
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#undef _loadh
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#undef _loadb
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#ifdef CONFIG_32BIT
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#define _loadd _loadw
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#else
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#define _loadd(reg, addr) "ld " reg ", " addr
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#endif
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#define _loadw(reg, addr) "lw " reg ", " addr
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#define _loadh(reg, addr) "lh " reg ", " addr
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#define _loadb(reg, addr) "lb " reg ", " addr
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#define __get_kernel_common(val, size, ptr) \
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do { \
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switch (size) { \
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case 1: __get_data_asm(val, _loadb, ptr); break; \
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case 2: __get_data_asm(val, _loadh, ptr); break; \
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case 4: __get_data_asm(val, _loadw, ptr); break; \
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case 8: __GET_DW(val, _loadd, ptr); break; \
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default: __get_user_unknown(); break; \
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} \
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} while (0)
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#endif
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#ifdef CONFIG_32BIT
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#define __GET_DW(val, insn, ptr) __get_data_asm_ll32(val, insn, ptr)
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#endif
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#ifdef CONFIG_64BIT
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#define __GET_DW(val, insn, ptr) __get_data_asm(val, insn, ptr)
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#endif
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extern void __get_user_unknown(void);
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#define __get_user_common(val, size, ptr) \
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do { \
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switch (size) { \
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case 1: __get_data_asm(val, user_lb, ptr); break; \
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case 2: __get_data_asm(val, user_lh, ptr); break; \
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case 4: __get_data_asm(val, user_lw, ptr); break; \
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case 8: __GET_DW(val, user_ld, ptr); break; \
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default: __get_user_unknown(); break; \
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} \
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} while (0)
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#define __get_user_nocheck(x, ptr, size) \
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({ \
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int __gu_err; \
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\
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if (eva_kernel_access()) { \
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__get_kernel_common((x), size, ptr); \
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} else { \
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__chk_user_ptr(ptr); \
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__get_user_common((x), size, ptr); \
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} \
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__gu_err; \
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})
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#define __get_user_check(x, ptr, size) \
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({ \
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int __gu_err = -EFAULT; \
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const __typeof__(*(ptr)) __user * __gu_ptr = (ptr); \
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\
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might_fault(); \
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if (likely(access_ok( __gu_ptr, size))) { \
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if (eva_kernel_access()) \
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__get_kernel_common((x), size, __gu_ptr); \
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else \
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__get_user_common((x), size, __gu_ptr); \
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} else \
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(x) = 0; \
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\
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__gu_err; \
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})
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#define __get_data_asm(val, insn, addr) \
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{ \
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long __gu_tmp; \
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\
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__asm__ __volatile__( \
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"1: "insn("%1", "%3")" \n" \
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"2: \n" \
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" .insn \n" \
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" .section .fixup,\"ax\" \n" \
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"3: li %0, %4 \n" \
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" move %1, $0 \n" \
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" j 2b \n" \
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" .previous \n" \
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" .section __ex_table,\"a\" \n" \
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" "__UA_ADDR "\t1b, 3b \n" \
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" .previous \n" \
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: "=r" (__gu_err), "=r" (__gu_tmp) \
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: "0" (0), "o" (__m(addr)), "i" (-EFAULT)); \
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\
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(val) = (__typeof__(*(addr))) __gu_tmp; \
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}
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/*
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* Get a long long 64 using 32 bit registers.
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*/
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#define __get_data_asm_ll32(val, insn, addr) \
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{ \
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union { \
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unsigned long long l; \
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__typeof__(*(addr)) t; \
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} __gu_tmp; \
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\
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__asm__ __volatile__( \
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"1: " insn("%1", "(%3)")" \n" \
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"2: " insn("%D1", "4(%3)")" \n" \
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"3: \n" \
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" .insn \n" \
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" .section .fixup,\"ax\" \n" \
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"4: li %0, %4 \n" \
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" move %1, $0 \n" \
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" move %D1, $0 \n" \
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" j 3b \n" \
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" .previous \n" \
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" .section __ex_table,\"a\" \n" \
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" " __UA_ADDR " 1b, 4b \n" \
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" " __UA_ADDR " 2b, 4b \n" \
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" .previous \n" \
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: "=r" (__gu_err), "=&r" (__gu_tmp.l) \
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: "0" (0), "r" (addr), "i" (-EFAULT)); \
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\
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(val) = __gu_tmp.t; \
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}
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#ifndef CONFIG_EVA
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#define __put_kernel_common(ptr, size) __put_user_common(ptr, size)
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#else
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/*
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* Kernel specific functions for EVA. We need to use normal load instructions
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* to read data from kernel when operating in EVA mode. We use these macros to
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* avoid redefining __get_data_asm for EVA.
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*/
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#undef _stored
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#undef _storew
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#undef _storeh
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#undef _storeb
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#ifdef CONFIG_32BIT
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#define _stored _storew
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#else
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#define _stored(reg, addr) "ld " reg ", " addr
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#endif
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#define _storew(reg, addr) "sw " reg ", " addr
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#define _storeh(reg, addr) "sh " reg ", " addr
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#define _storeb(reg, addr) "sb " reg ", " addr
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#define __put_kernel_common(ptr, size) \
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do { \
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switch (size) { \
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case 1: __put_data_asm(_storeb, ptr); break; \
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case 2: __put_data_asm(_storeh, ptr); break; \
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case 4: __put_data_asm(_storew, ptr); break; \
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case 8: __PUT_DW(_stored, ptr); break; \
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default: __put_user_unknown(); break; \
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} \
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} while(0)
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#endif
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/*
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* Yuck. We need two variants, one for 64bit operation and one
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* for 32 bit mode and old iron.
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*/
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#ifdef CONFIG_32BIT
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#define __PUT_DW(insn, ptr) __put_data_asm_ll32(insn, ptr)
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#endif
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#ifdef CONFIG_64BIT
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#define __PUT_DW(insn, ptr) __put_data_asm(insn, ptr)
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#endif
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#define __put_user_common(ptr, size) \
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do { \
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switch (size) { \
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case 1: __put_data_asm(user_sb, ptr); break; \
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case 2: __put_data_asm(user_sh, ptr); break; \
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case 4: __put_data_asm(user_sw, ptr); break; \
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case 8: __PUT_DW(user_sd, ptr); break; \
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default: __put_user_unknown(); break; \
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} \
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} while (0)
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#define __put_user_nocheck(x, ptr, size) \
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({ \
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__typeof__(*(ptr)) __pu_val; \
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int __pu_err = 0; \
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\
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__pu_val = (x); \
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if (eva_kernel_access()) { \
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__put_kernel_common(ptr, size); \
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} else { \
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__chk_user_ptr(ptr); \
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__put_user_common(ptr, size); \
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} \
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__pu_err; \
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})
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#define __put_user_check(x, ptr, size) \
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({ \
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__typeof__(*(ptr)) __user *__pu_addr = (ptr); \
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__typeof__(*(ptr)) __pu_val = (x); \
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int __pu_err = -EFAULT; \
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\
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might_fault(); \
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if (likely(access_ok( __pu_addr, size))) { \
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if (eva_kernel_access()) \
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__put_kernel_common(__pu_addr, size); \
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else \
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__put_user_common(__pu_addr, size); \
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} \
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\
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__pu_err; \
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})
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#define __put_data_asm(insn, ptr) \
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{ \
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__asm__ __volatile__( \
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"1: "insn("%z2", "%3")" # __put_data_asm \n" \
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"2: \n" \
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" .insn \n" \
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" .section .fixup,\"ax\" \n" \
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"3: li %0, %4 \n" \
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" j 2b \n" \
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" .previous \n" \
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" .section __ex_table,\"a\" \n" \
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" " __UA_ADDR " 1b, 3b \n" \
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" .previous \n" \
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: "=r" (__pu_err) \
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: "0" (0), "Jr" (__pu_val), "o" (__m(ptr)), \
|
|
"i" (-EFAULT)); \
|
|
}
|
|
|
|
#define __put_data_asm_ll32(insn, ptr) \
|
|
{ \
|
|
__asm__ __volatile__( \
|
|
"1: "insn("%2", "(%3)")" # __put_data_asm_ll32 \n" \
|
|
"2: "insn("%D2", "4(%3)")" \n" \
|
|
"3: \n" \
|
|
" .insn \n" \
|
|
" .section .fixup,\"ax\" \n" \
|
|
"4: li %0, %4 \n" \
|
|
" j 3b \n" \
|
|
" .previous \n" \
|
|
" .section __ex_table,\"a\" \n" \
|
|
" " __UA_ADDR " 1b, 4b \n" \
|
|
" " __UA_ADDR " 2b, 4b \n" \
|
|
" .previous" \
|
|
: "=r" (__pu_err) \
|
|
: "0" (0), "r" (__pu_val), "r" (ptr), \
|
|
"i" (-EFAULT)); \
|
|
}
|
|
|
|
extern void __put_user_unknown(void);
|
|
|
|
/*
|
|
* We're generating jump to subroutines which will be outside the range of
|
|
* jump instructions
|
|
*/
|
|
#ifdef MODULE
|
|
#define __MODULE_JAL(destination) \
|
|
".set\tnoat\n\t" \
|
|
__UA_LA "\t$1, " #destination "\n\t" \
|
|
"jalr\t$1\n\t" \
|
|
".set\tat\n\t"
|
|
#else
|
|
#define __MODULE_JAL(destination) \
|
|
"jal\t" #destination "\n\t"
|
|
#endif
|
|
|
|
#if defined(CONFIG_CPU_DADDI_WORKAROUNDS) || (defined(CONFIG_EVA) && \
|
|
defined(CONFIG_CPU_HAS_PREFETCH))
|
|
#define DADDI_SCRATCH "$3"
|
|
#else
|
|
#define DADDI_SCRATCH "$0"
|
|
#endif
|
|
|
|
extern size_t __copy_user(void *__to, const void *__from, size_t __n);
|
|
|
|
#define __invoke_copy_from(func, to, from, n) \
|
|
({ \
|
|
register void *__cu_to_r __asm__("$4"); \
|
|
register const void __user *__cu_from_r __asm__("$5"); \
|
|
register long __cu_len_r __asm__("$6"); \
|
|
\
|
|
__cu_to_r = (to); \
|
|
__cu_from_r = (from); \
|
|
__cu_len_r = (n); \
|
|
__asm__ __volatile__( \
|
|
".set\tnoreorder\n\t" \
|
|
__MODULE_JAL(func) \
|
|
".set\tnoat\n\t" \
|
|
__UA_ADDU "\t$1, %1, %2\n\t" \
|
|
".set\tat\n\t" \
|
|
".set\treorder" \
|
|
: "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \
|
|
: \
|
|
: "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \
|
|
DADDI_SCRATCH, "memory"); \
|
|
__cu_len_r; \
|
|
})
|
|
|
|
#define __invoke_copy_to(func, to, from, n) \
|
|
({ \
|
|
register void __user *__cu_to_r __asm__("$4"); \
|
|
register const void *__cu_from_r __asm__("$5"); \
|
|
register long __cu_len_r __asm__("$6"); \
|
|
\
|
|
__cu_to_r = (to); \
|
|
__cu_from_r = (from); \
|
|
__cu_len_r = (n); \
|
|
__asm__ __volatile__( \
|
|
__MODULE_JAL(func) \
|
|
: "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \
|
|
: \
|
|
: "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \
|
|
DADDI_SCRATCH, "memory"); \
|
|
__cu_len_r; \
|
|
})
|
|
|
|
#define __invoke_copy_from_kernel(to, from, n) \
|
|
__invoke_copy_from(__copy_user, to, from, n)
|
|
|
|
#define __invoke_copy_to_kernel(to, from, n) \
|
|
__invoke_copy_to(__copy_user, to, from, n)
|
|
|
|
#define ___invoke_copy_in_kernel(to, from, n) \
|
|
__invoke_copy_from(__copy_user, to, from, n)
|
|
|
|
#ifndef CONFIG_EVA
|
|
#define __invoke_copy_from_user(to, from, n) \
|
|
__invoke_copy_from(__copy_user, to, from, n)
|
|
|
|
#define __invoke_copy_to_user(to, from, n) \
|
|
__invoke_copy_to(__copy_user, to, from, n)
|
|
|
|
#define ___invoke_copy_in_user(to, from, n) \
|
|
__invoke_copy_from(__copy_user, to, from, n)
|
|
|
|
#else
|
|
|
|
/* EVA specific functions */
|
|
|
|
extern size_t __copy_from_user_eva(void *__to, const void *__from,
|
|
size_t __n);
|
|
extern size_t __copy_to_user_eva(void *__to, const void *__from,
|
|
size_t __n);
|
|
extern size_t __copy_in_user_eva(void *__to, const void *__from, size_t __n);
|
|
|
|
/*
|
|
* Source or destination address is in userland. We need to go through
|
|
* the TLB
|
|
*/
|
|
#define __invoke_copy_from_user(to, from, n) \
|
|
__invoke_copy_from(__copy_from_user_eva, to, from, n)
|
|
|
|
#define __invoke_copy_to_user(to, from, n) \
|
|
__invoke_copy_to(__copy_to_user_eva, to, from, n)
|
|
|
|
#define ___invoke_copy_in_user(to, from, n) \
|
|
__invoke_copy_from(__copy_in_user_eva, to, from, n)
|
|
|
|
#endif /* CONFIG_EVA */
|
|
|
|
static inline unsigned long
|
|
raw_copy_to_user(void __user *to, const void *from, unsigned long n)
|
|
{
|
|
if (eva_kernel_access())
|
|
return __invoke_copy_to_kernel(to, from, n);
|
|
else
|
|
return __invoke_copy_to_user(to, from, n);
|
|
}
|
|
|
|
static inline unsigned long
|
|
raw_copy_from_user(void *to, const void __user *from, unsigned long n)
|
|
{
|
|
if (eva_kernel_access())
|
|
return __invoke_copy_from_kernel(to, from, n);
|
|
else
|
|
return __invoke_copy_from_user(to, from, n);
|
|
}
|
|
|
|
#define INLINE_COPY_FROM_USER
|
|
#define INLINE_COPY_TO_USER
|
|
|
|
static inline unsigned long
|
|
raw_copy_in_user(void __user*to, const void __user *from, unsigned long n)
|
|
{
|
|
if (eva_kernel_access())
|
|
return ___invoke_copy_in_kernel(to, from, n);
|
|
else
|
|
return ___invoke_copy_in_user(to, from, n);
|
|
}
|
|
|
|
extern __kernel_size_t __bzero_kernel(void __user *addr, __kernel_size_t size);
|
|
extern __kernel_size_t __bzero(void __user *addr, __kernel_size_t size);
|
|
|
|
/*
|
|
* __clear_user: - Zero a block of memory in user space, with less checking.
|
|
* @to: Destination address, in user space.
|
|
* @n: Number of bytes to zero.
|
|
*
|
|
* Zero a block of memory in user space. Caller must check
|
|
* the specified block with access_ok() before calling this function.
|
|
*
|
|
* Returns number of bytes that could not be cleared.
|
|
* On success, this will be zero.
|
|
*/
|
|
static inline __kernel_size_t
|
|
__clear_user(void __user *addr, __kernel_size_t size)
|
|
{
|
|
__kernel_size_t res;
|
|
|
|
#ifdef CONFIG_CPU_MICROMIPS
|
|
/* micromips memset / bzero also clobbers t7 & t8 */
|
|
#define bzero_clobbers "$4", "$5", "$6", __UA_t0, __UA_t1, "$15", "$24", "$31"
|
|
#else
|
|
#define bzero_clobbers "$4", "$5", "$6", __UA_t0, __UA_t1, "$31"
|
|
#endif /* CONFIG_CPU_MICROMIPS */
|
|
|
|
if (eva_kernel_access()) {
|
|
__asm__ __volatile__(
|
|
"move\t$4, %1\n\t"
|
|
"move\t$5, $0\n\t"
|
|
"move\t$6, %2\n\t"
|
|
__MODULE_JAL(__bzero_kernel)
|
|
"move\t%0, $6"
|
|
: "=r" (res)
|
|
: "r" (addr), "r" (size)
|
|
: bzero_clobbers);
|
|
} else {
|
|
might_fault();
|
|
__asm__ __volatile__(
|
|
"move\t$4, %1\n\t"
|
|
"move\t$5, $0\n\t"
|
|
"move\t$6, %2\n\t"
|
|
__MODULE_JAL(__bzero)
|
|
"move\t%0, $6"
|
|
: "=r" (res)
|
|
: "r" (addr), "r" (size)
|
|
: bzero_clobbers);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
#define clear_user(addr,n) \
|
|
({ \
|
|
void __user * __cl_addr = (addr); \
|
|
unsigned long __cl_size = (n); \
|
|
if (__cl_size && access_ok(__cl_addr, __cl_size)) \
|
|
__cl_size = __clear_user(__cl_addr, __cl_size); \
|
|
__cl_size; \
|
|
})
|
|
|
|
extern long __strncpy_from_kernel_asm(char *__to, const char __user *__from, long __len);
|
|
extern long __strncpy_from_user_asm(char *__to, const char __user *__from, long __len);
|
|
|
|
/*
|
|
* strncpy_from_user: - Copy a NUL terminated string from userspace.
|
|
* @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.
|
|
*
|
|
* 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.
|
|
*/
|
|
static inline long
|
|
strncpy_from_user(char *__to, const char __user *__from, long __len)
|
|
{
|
|
long res;
|
|
|
|
if (eva_kernel_access()) {
|
|
__asm__ __volatile__(
|
|
"move\t$4, %1\n\t"
|
|
"move\t$5, %2\n\t"
|
|
"move\t$6, %3\n\t"
|
|
__MODULE_JAL(__strncpy_from_kernel_asm)
|
|
"move\t%0, $2"
|
|
: "=r" (res)
|
|
: "r" (__to), "r" (__from), "r" (__len)
|
|
: "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory");
|
|
} else {
|
|
might_fault();
|
|
__asm__ __volatile__(
|
|
"move\t$4, %1\n\t"
|
|
"move\t$5, %2\n\t"
|
|
"move\t$6, %3\n\t"
|
|
__MODULE_JAL(__strncpy_from_user_asm)
|
|
"move\t%0, $2"
|
|
: "=r" (res)
|
|
: "r" (__to), "r" (__from), "r" (__len)
|
|
: "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory");
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
extern long __strnlen_kernel_asm(const char __user *s, long n);
|
|
extern long __strnlen_user_asm(const char __user *s, long n);
|
|
|
|
/*
|
|
* strnlen_user: - Get the size of a string in user space.
|
|
* @str: The string to measure.
|
|
*
|
|
* Context: User context only. This function may sleep if pagefaults are
|
|
* enabled.
|
|
*
|
|
* 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 the string is too long, returns a value greater than @n.
|
|
*/
|
|
static inline long strnlen_user(const char __user *s, long n)
|
|
{
|
|
long res;
|
|
|
|
might_fault();
|
|
if (eva_kernel_access()) {
|
|
__asm__ __volatile__(
|
|
"move\t$4, %1\n\t"
|
|
"move\t$5, %2\n\t"
|
|
__MODULE_JAL(__strnlen_kernel_asm)
|
|
"move\t%0, $2"
|
|
: "=r" (res)
|
|
: "r" (s), "r" (n)
|
|
: "$2", "$4", "$5", __UA_t0, "$31");
|
|
} else {
|
|
__asm__ __volatile__(
|
|
"move\t$4, %1\n\t"
|
|
"move\t$5, %2\n\t"
|
|
__MODULE_JAL(__strnlen_user_asm)
|
|
"move\t%0, $2"
|
|
: "=r" (res)
|
|
: "r" (s), "r" (n)
|
|
: "$2", "$4", "$5", __UA_t0, "$31");
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
#endif /* _ASM_UACCESS_H */
|