Release 4.11 arch/powerpc/include/asm/uaccess.h
#ifndef _ARCH_POWERPC_UACCESS_H
#define _ARCH_POWERPC_UACCESS_H
#ifdef __KERNEL__
#ifndef __ASSEMBLY__
#include <linux/sched.h>
#include <linux/errno.h>
#include <asm/asm-compat.h>
#include <asm/ppc_asm.h>
#include <asm/processor.h>
#include <asm/page.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.
*
* The fs/ds values are now the highest legal address in the "segment".
* This simplifies the checking in the routines below.
*/
#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
#define KERNEL_DS MAKE_MM_SEG(~0UL)
#ifdef __powerpc64__
/* We use TASK_SIZE_USER64 as TASK_SIZE is not constant */
#define USER_DS MAKE_MM_SEG(TASK_SIZE_USER64 - 1)
#else
#define USER_DS MAKE_MM_SEG(TASK_SIZE - 1)
#endif
#define get_ds() (KERNEL_DS)
#define get_fs() (current->thread.fs)
#define set_fs(val) (current->thread.fs = (val))
#define segment_eq(a, b) ((a).seg == (b).seg)
#define user_addr_max() (get_fs().seg)
#ifdef __powerpc64__
/*
* This check is sufficient because there is a large enough
* gap between user addresses and the kernel addresses
*/
#define __access_ok(addr, size, segment) \
(((addr) <= (segment).seg) && ((size) <= (segment).seg))
#else
#define __access_ok(addr, size, segment) \
(((addr) <= (segment).seg) && \
(((size) == 0) || (((size) - 1) <= ((segment).seg - (addr)))))
#endif
#define access_ok(type, addr, size) \
(__chk_user_ptr(addr), \
__access_ok((__force unsigned long)(addr), (size), get_fs()))
/*
* The exception table consists of pairs of relative 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.
*/
#define ARCH_HAS_RELATIVE_EXTABLE
struct exception_table_entry {
int insn;
int fixup;
};
static inline unsigned long extable_fixup(const struct exception_table_entry *x)
{
return (unsigned long)&x->fixup + x->fixup;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nicholas Piggin | 28 | 100.00% | 1 | 100.00% |
| Total | 28 | 100.00% | 1 | 100.00% |
/*
* These are the main single-value transfer routines. They automatically
* use the right size if we just have the right pointer type.
*
* This gets kind of ugly. We want to return _two_ values in "get_user()"
* and yet we don't want to do any pointers, because that is too much
* of a performance impact. Thus we have a few rather ugly macros here,
* and hide all the ugliness from the user.
*
* The "__xxx" versions of the user access functions are versions that
* do not verify the address space, that must have been done previously
* with a separate "access_ok()" call (this is used when we do multiple
* accesses to the same area of user memory).
*
* As we use the same address space for kernel and user data on the
* PowerPC, we can just do these as direct assignments. (Of course, the
* exception handling means that it's no longer "just"...)
*
*/
#define get_user(x, ptr) \
__get_user_check((x), (ptr), sizeof(*(ptr)))
#define put_user(x, ptr) \
__put_user_check((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
#define __get_user(x, ptr) \
__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
#define __put_user(x, ptr) \
__put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
#define __get_user_inatomic(x, ptr) \
__get_user_nosleep((x), (ptr), sizeof(*(ptr)))
#define __put_user_inatomic(x, ptr) \
__put_user_nosleep((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
#define __get_user_unaligned __get_user
#define __put_user_unaligned __put_user
extern long __put_user_bad(void);
/*
* We don't tell gcc that we are accessing memory, but this is OK
* because we do not write to any memory gcc knows about, so there
* are no aliasing issues.
*/
#define __put_user_asm(x, addr, err, op) \
__asm__ __volatile__( \
"1: " op " %1,0(%2) # put_user\n" \
"2:\n" \
".section .fixup,\"ax\"\n" \
"3: li %0,%3\n" \
" b 2b\n" \
".previous\n" \
EX_TABLE(1b, 3b) \
: "=r" (err) \
: "r" (x), "b" (addr), "i" (-EFAULT), "0" (err))
#ifdef __powerpc64__
#define __put_user_asm2(x, ptr, retval) \
__put_user_asm(x, ptr, retval, "std")
#else /* __powerpc64__ */
#define __put_user_asm2(x, addr, err) \
__asm__ __volatile__( \
"1: stw %1,0(%2)\n" \
"2: stw %1+1,4(%2)\n" \
"3:\n" \
".section .fixup,\"ax\"\n" \
"4: li %0,%3\n" \
" b 3b\n" \
".previous\n" \
EX_TABLE(1b, 4b) \
EX_TABLE(2b, 4b) \
: "=r" (err) \
: "r" (x), "b" (addr), "i" (-EFAULT), "0" (err))
#endif /* __powerpc64__ */
#define __put_user_size(x, ptr, size, retval) \
do { \
retval = 0; \
switch (size) { \
case 1: __put_user_asm(x, ptr, retval, "stb"); break; \
case 2: __put_user_asm(x, ptr, retval, "sth"); break; \
case 4: __put_user_asm(x, ptr, retval, "stw"); break; \
case 8: __put_user_asm2(x, ptr, retval); break; \
default: __put_user_bad(); \
} \
} while (0)
#define __put_user_nocheck(x, ptr, size) \
({ \
long __pu_err; \
__typeof__(*(ptr)) __user *__pu_addr = (ptr); \
if (!is_kernel_addr((unsigned long)__pu_addr)) \
might_fault(); \
__chk_user_ptr(ptr); \
__put_user_size((x), __pu_addr, (size), __pu_err); \
__pu_err; \
})
#define __put_user_check(x, ptr, size) \
({ \
long __pu_err = -EFAULT; \
__typeof__(*(ptr)) __user *__pu_addr = (ptr); \
might_fault(); \
if (access_ok(VERIFY_WRITE, __pu_addr, size)) \
__put_user_size((x), __pu_addr, (size), __pu_err); \
__pu_err; \
})
#define __put_user_nosleep(x, ptr, size) \
({ \
long __pu_err; \
__typeof__(*(ptr)) __user *__pu_addr = (ptr); \
__chk_user_ptr(ptr); \
__put_user_size((x), __pu_addr, (size), __pu_err); \
__pu_err; \
})
extern long __get_user_bad(void);
#define __get_user_asm(x, addr, err, op) \
__asm__ __volatile__( \
"1: "op" %1,0(%2) # get_user\n" \
"2:\n" \
".section .fixup,\"ax\"\n" \
"3: li %0,%3\n" \
" li %1,0\n" \
" b 2b\n" \
".previous\n" \
EX_TABLE(1b, 3b) \
: "=r" (err), "=r" (x) \
: "b" (addr), "i" (-EFAULT), "0" (err))
#ifdef __powerpc64__
#define __get_user_asm2(x, addr, err) \
__get_user_asm(x, addr, err, "ld")
#else /* __powerpc64__ */
#define __get_user_asm2(x, addr, err) \
__asm__ __volatile__( \
"1: lwz %1,0(%2)\n" \
"2: lwz %1+1,4(%2)\n" \
"3:\n" \
".section .fixup,\"ax\"\n" \
"4: li %0,%3\n" \
" li %1,0\n" \
" li %1+1,0\n" \
" b 3b\n" \
".previous\n" \
EX_TABLE(1b, 4b) \
EX_TABLE(2b, 4b) \
: "=r" (err), "=&r" (x) \
: "b" (addr), "i" (-EFAULT), "0" (err))
#endif /* __powerpc64__ */
#define __get_user_size(x, ptr, size, retval) \
do { \
retval = 0; \
__chk_user_ptr(ptr); \
if (size > sizeof(x)) \
(x) = __get_user_bad(); \
switch (size) { \
case 1: __get_user_asm(x, ptr, retval, "lbz"); break; \
case 2: __get_user_asm(x, ptr, retval, "lhz"); break; \
case 4: __get_user_asm(x, ptr, retval, "lwz"); break; \
case 8: __get_user_asm2(x, ptr, retval); break; \
default: (x) = __get_user_bad(); \
} \
} while (0)
#define __get_user_nocheck(x, ptr, size) \
({ \
long __gu_err; \
unsigned long __gu_val; \
const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
__chk_user_ptr(ptr); \
if (!is_kernel_addr((unsigned long)__gu_addr)) \
might_fault(); \
__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
(x) = (__typeof__(*(ptr)))__gu_val; \
__gu_err; \
})
#define __get_user_check(x, ptr, size) \
({ \
long __gu_err = -EFAULT; \
unsigned long __gu_val = 0; \
const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
might_fault(); \
if (access_ok(VERIFY_READ, __gu_addr, (size))) \
__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
(x) = (__force __typeof__(*(ptr)))__gu_val; \
__gu_err; \
})
#define __get_user_nosleep(x, ptr, size) \
({ \
long __gu_err; \
unsigned long __gu_val; \
const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
__chk_user_ptr(ptr); \
__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
(x) = (__force __typeof__(*(ptr)))__gu_val; \
__gu_err; \
})
/* more complex routines */
extern unsigned long __copy_tofrom_user(void __user *to,
const void __user *from, unsigned long size);
#ifndef __powerpc64__
static inline unsigned long copy_from_user(void *to,
const void __user *from, unsigned long n)
{
if (likely(access_ok(VERIFY_READ, from, n))) {
check_object_size(to, n, false);
return __copy_tofrom_user((__force void __user *)to, from, n);
}
memset(to, 0, n);
return n;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Stephen Rothwell | 54 | 72.00% | 1 | 25.00% |
| Kees Cook | 14 | 18.67% | 1 | 25.00% |
| Al Viro | 6 | 8.00% | 1 | 25.00% |
| Adrian Bunk | 1 | 1.33% | 1 | 25.00% |
| Total | 75 | 100.00% | 4 | 100.00% |
static inline unsigned long copy_to_user(void __user *to,
const void *from, unsigned long n)
{
if (access_ok(VERIFY_WRITE, to, n)) {
check_object_size(from, n, true);
return __copy_tofrom_user(to, (__force void __user *)from, n);
}
return n;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Stephen Rothwell | 51 | 80.95% | 1 | 33.33% |
| Kees Cook | 11 | 17.46% | 1 | 33.33% |
| Adrian Bunk | 1 | 1.59% | 1 | 33.33% |
| Total | 63 | 100.00% | 3 | 100.00% |
#else /* __powerpc64__ */
#define __copy_in_user(to, from, size) \
__copy_tofrom_user((to), (from), (size))
extern unsigned long copy_from_user(void *to, const void __user *from,
unsigned long n);
extern unsigned long copy_to_user(void __user *to, const void *from,
unsigned long n);
extern unsigned long copy_in_user(void __user *to, const void __user *from,
unsigned long n);
#endif /* __powerpc64__ */
static inline unsigned long __copy_from_user_inatomic(void *to,
const void __user *from, unsigned long n)
{
if (__builtin_constant_p(n) && (n <= 8)) {
unsigned long ret = 1;
switch (n) {
case 1:
__get_user_size(*(u8 *)to, from, 1, ret);
break;
case 2:
__get_user_size(*(u16 *)to, from, 2, ret);
break;
case 4:
__get_user_size(*(u32 *)to, from, 4, ret);
break;
case 8:
__get_user_size(*(u64 *)to, from, 8, ret);
break;
}
if (ret == 0)
return 0;
}
check_object_size(to, n, false);
return __copy_tofrom_user((__force void __user *)to, from, n);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Anton Blanchard | 114 | 69.94% | 3 | 37.50% |
| Stephen Rothwell | 27 | 16.56% | 2 | 25.00% |
| Paul Mackerras | 11 | 6.75% | 1 | 12.50% |
| Kees Cook | 9 | 5.52% | 1 | 12.50% |
| Nate Case | 2 | 1.23% | 1 | 12.50% |
| Total | 163 | 100.00% | 8 | 100.00% |
static inline unsigned long __copy_to_user_inatomic(void __user *to,
const void *from, unsigned long n)
{
if (__builtin_constant_p(n) && (n <= 8)) {
unsigned long ret = 1;
switch (n) {
case 1:
__put_user_size(*(u8 *)from, (u8 __user *)to, 1, ret);
break;
case 2:
__put_user_size(*(u16 *)from, (u16 __user *)to, 2, ret);
break;
case 4:
__put_user_size(*(u32 *)from, (u32 __user *)to, 4, ret);
break;
case 8:
__put_user_size(*(u64 *)from, (u64 __user *)to, 8, ret);
break;
}
if (ret == 0)
return 0;
}
check_object_size(from, n, true);
return __copy_tofrom_user(to, (__force const void __user *)from, n);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Anton Blanchard | 123 | 66.85% | 3 | 30.00% |
| Paul Mackerras | 21 | 11.41% | 1 | 10.00% |
| Stephen Rothwell | 18 | 9.78% | 2 | 20.00% |
| Linus Torvalds | 10 | 5.43% | 1 | 10.00% |
| Kees Cook | 9 | 4.89% | 1 | 10.00% |
| Nate Case | 2 | 1.09% | 1 | 10.00% |
| Al Viro | 1 | 0.54% | 1 | 10.00% |
| Total | 184 | 100.00% | 10 | 100.00% |
static inline unsigned long __copy_from_user(void *to,
const void __user *from, unsigned long size)
{
might_fault();
return __copy_from_user_inatomic(to, from, size);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Stephen Rothwell | 34 | 97.14% | 1 | 50.00% |
| Michael S. Tsirkin | 1 | 2.86% | 1 | 50.00% |
| Total | 35 | 100.00% | 2 | 100.00% |
static inline unsigned long __copy_to_user(void __user *to,
const void *from, unsigned long size)
{
might_fault();
return __copy_to_user_inatomic(to, from, size);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Paul Mackerras | 32 | 91.43% | 1 | 33.33% |
| Stephen Rothwell | 2 | 5.71% | 1 | 33.33% |
| Michael S. Tsirkin | 1 | 2.86% | 1 | 33.33% |
| Total | 35 | 100.00% | 3 | 100.00% |
extern unsigned long __clear_user(void __user *addr, unsigned long size);
static inline unsigned long clear_user(void __user *addr, unsigned long size)
{
might_fault();
if (likely(access_ok(VERIFY_WRITE, addr, size)))
return __clear_user(addr, size);
return size;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Anton Blanchard | 36 | 80.00% | 5 | 62.50% |
| Stephen Rothwell | 7 | 15.56% | 1 | 12.50% |
| Linus Torvalds | 1 | 2.22% | 1 | 12.50% |
| Michael S. Tsirkin | 1 | 2.22% | 1 | 12.50% |
| Total | 45 | 100.00% | 8 | 100.00% |
extern long strncpy_from_user(char *dst, const char __user *src, long count);
extern __must_check long strlen_user(const char __user *str);
extern __must_check long strnlen_user(const char __user *str, long n);
#endif /* __ASSEMBLY__ */
#endif /* __KERNEL__ */
#endif /* _ARCH_POWERPC_UACCESS_H */
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Anton Blanchard | 549 | 44.45% | 6 | 21.43% |
| Stephen Rothwell | 429 | 34.74% | 3 | 10.71% |
| Paul Mackerras | 81 | 6.56% | 3 | 10.71% |
| Benjamin Herrenschmidt | 43 | 3.48% | 1 | 3.57% |
| Kees Cook | 43 | 3.48% | 1 | 3.57% |
| Nicholas Piggin | 41 | 3.32% | 2 | 7.14% |
| Linus Torvalds | 16 | 1.30% | 1 | 3.57% |
| Arun Sharma | 8 | 0.65% | 1 | 3.57% |
| Al Viro | 7 | 0.57% | 2 | 7.14% |
| Michael S. Tsirkin | 5 | 0.40% | 1 | 3.57% |
| Nate Case | 4 | 0.32% | 1 | 3.57% |
| Michael Ellerman | 3 | 0.24% | 1 | 3.57% |
| Daniel Axtens | 3 | 0.24% | 3 | 10.71% |
| Adrian Bunk | 2 | 0.16% | 1 | 3.57% |
| Bharat Bhushan | 1 | 0.08% | 1 | 3.57% |
| Total | 1235 | 100.00% | 28 | 100.00% |
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