Release 4.7 arch/s390/include/asm/uaccess.h
/*
* S390 version
* Copyright IBM Corp. 1999, 2000
* Author(s): Hartmut Penner (hp@de.ibm.com),
* Martin Schwidefsky (schwidefsky@de.ibm.com)
*
* Derived from "include/asm-i386/uaccess.h"
*/
#ifndef __S390_UACCESS_H
#define __S390_UACCESS_H
/*
* User space memory access functions
*/
#include <linux/sched.h>
#include <linux/errno.h>
#include <asm/ctl_reg.h>
#define VERIFY_READ 0
#define VERIFY_WRITE 1
/*
* 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(a) ((mm_segment_t) { (a) })
#define KERNEL_DS MAKE_MM_SEG(0)
#define USER_DS MAKE_MM_SEG(1)
#define get_ds() (KERNEL_DS)
#define get_fs() (current->thread.mm_segment)
#define set_fs(x) \
({ \
unsigned long __pto; \
current->thread.mm_segment = (x); \
__pto = current->thread.mm_segment.ar4 ? \
S390_lowcore.user_asce : S390_lowcore.kernel_asce; \
__ctl_load(__pto, 7, 7); \
})
#define segment_eq(a,b) ((a).ar4 == (b).ar4)
static inline int __range_ok(unsigned long addr, unsigned long size)
{
return 1;
}
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#define __access_ok(addr, size) \
({ \
__chk_user_ptr(addr); \
__range_ok((unsigned long)(addr), (size)); \
})
#define access_ok(type, addr, size) __access_ok(addr, size)
/*
* The exception table consists of pairs of addresses: the first is the
* address of an instruction that is allowed to fault, and the second is
* the address at which the program should continue. No registers are
* modified, so it is entirely up to the continuation code to figure out
* what to do.
*
* All the routines below use bits of fixup code that are out of line
* with the main instruction path. This means when everything is well,
* we don't even have to jump over them. Further, they do not intrude
* on our cache or tlb entries.
*/
struct exception_table_entry
{
int insn, fixup;
};
static inline unsigned long extable_fixup(const struct exception_table_entry *x)
{
return (unsigned long)&x->fixup + x->fixup;
}
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#define ARCH_HAS_RELATIVE_EXTABLE
/**
* __copy_from_user: - Copy a block of data from user space, with less checking.
* @to: Destination address, in kernel space.
* @from: Source address, in user space.
* @n: Number of bytes to copy.
*
* Context: User context only. This function may sleep if pagefaults are
* enabled.
*
* Copy data from user space to kernel space. Caller must check
* the specified block with access_ok() before calling this function.
*
* Returns number of bytes that could not be copied.
* On success, this will be zero.
*
* If some data could not be copied, this function will pad the copied
* data to the requested size using zero bytes.
*/
unsigned long __must_check __copy_from_user(void *to, const void __user *from,
unsigned long n);
/**
* __copy_to_user: - Copy a block of data into user space, with less checking.
* @to: Destination address, in user space.
* @from: Source address, in kernel space.
* @n: Number of bytes to copy.
*
* Context: User context only. This function may sleep if pagefaults are
* enabled.
*
* Copy data from kernel space to user space. Caller must check
* the specified block with access_ok() before calling this function.
*
* Returns number of bytes that could not be copied.
* On success, this will be zero.
*/
unsigned long __must_check __copy_to_user(void __user *to, const void *from,
unsigned long n);
#define __copy_to_user_inatomic __copy_to_user
#define __copy_from_user_inatomic __copy_from_user
#ifdef CONFIG_HAVE_MARCH_Z10_FEATURES
#define __put_get_user_asm(to, from, size, spec) \
({ \
register unsigned long __reg0 asm("0") = spec; \
int __rc; \
\
asm volatile( \
"0: mvcos %1,%3,%2\n" \
"1: xr %0,%0\n" \
"2:\n" \
".pushsection .fixup, \"ax\"\n" \
"3: lhi %0,%5\n" \
" jg 2b\n" \
".popsection\n" \
EX_TABLE(0b,3b) EX_TABLE(1b,3b) \
: "=d" (__rc), "=Q" (*(to)) \
: "d" (size), "Q" (*(from)), \
"d" (__reg0), "K" (-EFAULT) \
: "cc"); \
__rc; \
})
#define __put_user_fn(x, ptr, size) __put_get_user_asm(ptr, x, size, 0x810000UL)
#define __get_user_fn(x, ptr, size) __put_get_user_asm(x, ptr, size, 0x81UL)
#else /* CONFIG_HAVE_MARCH_Z10_FEATURES */
static inline int __put_user_fn(void *x, void __user *ptr, unsigned long size)
{
size = __copy_to_user(ptr, x, size);
return size ? -EFAULT : 0;
}
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| gerald schaefer | gerald schaefer | 29 | 74.36% | 1 | 25.00% |
| heiko carstens | heiko carstens | 10 | 25.64% | 3 | 75.00% |
| Total | 39 | 100.00% | 4 | 100.00% |
static inline int __get_user_fn(void *x, const void __user *ptr, unsigned long size)
{
size = __copy_from_user(x, ptr, size);
return size ? -EFAULT : 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| gerald schaefer | gerald schaefer | 26 | 65.00% | 1 | 20.00% |
| heiko carstens | heiko carstens | 10 | 25.00% | 3 | 60.00% |
| martin schwidefsky | martin schwidefsky | 4 | 10.00% | 1 | 20.00% |
| Total | 40 | 100.00% | 5 | 100.00% |
#endif /* CONFIG_HAVE_MARCH_Z10_FEATURES */
/*
* These are the main single-value transfer routines. They automatically
* use the right size if we just have the right pointer type.
*/
#define __put_user(x, ptr) \
({ \
__typeof__(*(ptr)) __x = (x); \
int __pu_err = -EFAULT; \
__chk_user_ptr(ptr); \
switch (sizeof (*(ptr))) { \
case 1: \
case 2: \
case 4: \
case 8: \
__pu_err = __put_user_fn(&__x, ptr, \
sizeof(*(ptr))); \
break; \
default: \
__put_user_bad(); \
break; \
} \
__pu_err; \
})
#define put_user(x, ptr) \
({ \
might_fault(); \
__put_user(x, ptr); \
})
int __put_user_bad(void) __attribute__((noreturn));
#define __get_user(x, ptr) \
({ \
int __gu_err = -EFAULT; \
__chk_user_ptr(ptr); \
switch (sizeof(*(ptr))) { \
case 1: { \
unsigned char __x; \
__gu_err = __get_user_fn(&__x, ptr, \
sizeof(*(ptr))); \
(x) = *(__force __typeof__(*(ptr)) *) &__x; \
break; \
}; \
case 2: { \
unsigned short __x; \
__gu_err = __get_user_fn(&__x, ptr, \
sizeof(*(ptr))); \
(x) = *(__force __typeof__(*(ptr)) *) &__x; \
break; \
}; \
case 4: { \
unsigned int __x; \
__gu_err = __get_user_fn(&__x, ptr, \
sizeof(*(ptr))); \
(x) = *(__force __typeof__(*(ptr)) *) &__x; \
break; \
}; \
case 8: { \
unsigned long long __x; \
__gu_err = __get_user_fn(&__x, ptr, \
sizeof(*(ptr))); \
(x) = *(__force __typeof__(*(ptr)) *) &__x; \
break; \
}; \
default: \
__get_user_bad(); \
break; \
} \
__gu_err; \
})
#define get_user(x, ptr) \
({ \
might_fault(); \
__get_user(x, ptr); \
})
int __get_user_bad(void) __attribute__((noreturn));
#define __put_user_unaligned __put_user
#define __get_user_unaligned __get_user
/**
* copy_to_user: - Copy a block of data into user space.
* @to: Destination address, in user space.
* @from: Source address, in kernel space.
* @n: Number of bytes to copy.
*
* Context: User context only. This function may sleep if pagefaults are
* enabled.
*
* Copy data from kernel space to user space.
*
* Returns number of bytes that could not be copied.
* On success, this will be zero.
*/
static inline unsigned long __must_check
copy_to_user(void __user *to, const void *from, unsigned long n)
{
might_fault();
return __copy_to_user(to, from, n);
}
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| Person | Tokens | Prop | Commits | CommitProp |
| andrew morton | andrew morton | 25 | 69.44% | 1 | 20.00% |
| pre-git | pre-git | 8 | 22.22% | 1 | 20.00% |
| heiko carstens | heiko carstens | 3 | 8.33% | 3 | 60.00% |
| Total | 36 | 100.00% | 5 | 100.00% |
void copy_from_user_overflow(void)
#ifdef CONFIG_DEBUG_STRICT_USER_COPY_CHECKS
__compiletime_warning("copy_from_user() buffer size is not provably correct")
#endif
;
/**
* copy_from_user: - Copy a block of data from user space.
* @to: Destination address, in kernel space.
* @from: Source address, in user space.
* @n: Number of bytes to copy.
*
* Context: User context only. This function may sleep if pagefaults are
* enabled.
*
* Copy data from user space to kernel space.
*
* Returns number of bytes that could not be copied.
* On success, this will be zero.
*
* If some data could not be copied, this function will pad the copied
* data to the requested size using zero bytes.
*/
static inline unsigned long __must_check
copy_from_user(void *to, const void __user *from, unsigned long n)
{
unsigned int sz = __compiletime_object_size(to);
might_fault();
if (unlikely(sz != -1 && sz < n)) {
copy_from_user_overflow();
return n;
}
return __copy_from_user(to, from, n);
}
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| Person | Tokens | Prop | Commits | CommitProp |
| heiko carstens | heiko carstens | 32 | 47.76% | 4 | 66.67% |
| andrew morton | andrew morton | 27 | 40.30% | 1 | 16.67% |
| pre-git | pre-git | 8 | 11.94% | 1 | 16.67% |
| Total | 67 | 100.00% | 6 | 100.00% |
unsigned long __must_check
__copy_in_user(void __user *to, const void __user *from, unsigned long n);
static inline unsigned long __must_check
copy_in_user(void __user *to, const void __user *from, unsigned long n)
{
might_fault();
return __copy_in_user(to, from, n);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| andrew morton | andrew morton | 17 | 45.95% | 1 | 16.67% |
| pre-git | pre-git | 14 | 37.84% | 1 | 16.67% |
| gerald schaefer | gerald schaefer | 3 | 8.11% | 1 | 16.67% |
| heiko carstens | heiko carstens | 3 | 8.11% | 3 | 50.00% |
| Total | 37 | 100.00% | 6 | 100.00% |
/*
* Copy a null terminated string from userspace.
*/
long __strncpy_from_user(char *dst, const char __user *src, long count);
static inline long __must_check
strncpy_from_user(char *dst, const char __user *src, long count)
{
might_fault();
return __strncpy_from_user(dst, src, count);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| linus torvalds | linus torvalds | 23 | 67.65% | 1 | 10.00% |
| heiko carstens | heiko carstens | 6 | 17.65% | 5 | 50.00% |
| andrew morton | andrew morton | 2 | 5.88% | 2 | 20.00% |
| martin schwidefsky | martin schwidefsky | 2 | 5.88% | 1 | 10.00% |
| gerald schaefer | gerald schaefer | 1 | 2.94% | 1 | 10.00% |
| Total | 34 | 100.00% | 10 | 100.00% |
unsigned long __must_check __strnlen_user(const char __user *src, unsigned long count);
static inline unsigned long strnlen_user(const char __user *src, unsigned long n)
{
might_fault();
return __strnlen_user(src, n);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| martin schwidefsky | martin schwidefsky | 17 | 58.62% | 2 | 22.22% |
| heiko carstens | heiko carstens | 8 | 27.59% | 4 | 44.44% |
| andrew morton | andrew morton | 4 | 13.79% | 3 | 33.33% |
| Total | 29 | 100.00% | 9 | 100.00% |
/**
* strlen_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 there is a limit on the length of a valid string, you may wish to
* consider using strnlen_user() instead.
*/
#define strlen_user(str) strnlen_user(str, ~0UL)
/*
* Zero Userspace
*/
unsigned long __must_check __clear_user(void __user *to, unsigned long size);
static inline unsigned long __must_check clear_user(void __user *to, unsigned long n)
{
might_fault();
return __clear_user(to, n);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| linus torvalds | linus torvalds | 13 | 44.83% | 1 | 9.09% |
| heiko carstens | heiko carstens | 10 | 34.48% | 6 | 54.55% |
| martin schwidefsky | martin schwidefsky | 2 | 6.90% | 1 | 9.09% |
| pre-git | pre-git | 2 | 6.90% | 1 | 9.09% |
| gerald schaefer | gerald schaefer | 1 | 3.45% | 1 | 9.09% |
| andrew morton | andrew morton | 1 | 3.45% | 1 | 9.09% |
| Total | 29 | 100.00% | 11 | 100.00% |
int copy_to_user_real(void __user *dest, void *src, unsigned long count);
void s390_kernel_write(void *dst, const void *src, size_t size);
#endif /* __S390_UACCESS_H */
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| Person | Tokens | Prop | Commits | CommitProp |
| heiko carstens | heiko carstens | 287 | 37.96% | 13 | 43.33% |
| pre-git | pre-git | 142 | 18.78% | 1 | 3.33% |
| andrew morton | andrew morton | 126 | 16.67% | 4 | 13.33% |
| gerald schaefer | gerald schaefer | 82 | 10.85% | 2 | 6.67% |
| martin schwidefsky | martin schwidefsky | 51 | 6.75% | 5 | 16.67% |
| linus torvalds | linus torvalds | 36 | 4.76% | 1 | 3.33% |
| david howells | david howells | 18 | 2.38% | 1 | 3.33% |
| arun sharma | arun sharma | 8 | 1.06% | 1 | 3.33% |
| david hildenbrand | david hildenbrand | 5 | 0.66% | 1 | 3.33% |
| ard biesheuvel | ard biesheuvel | 1 | 0.13% | 1 | 3.33% |
| Total | 756 | 100.00% | 30 | 100.00% |
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