Contributors: 3
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Rusty Russell |
184 |
96.84% |
1 |
33.33% |
| Mark Rutland |
5 |
2.63% |
1 |
33.33% |
| Greg Kroah-Hartman |
1 |
0.53% |
1 |
33.33% |
| Total |
190 |
|
3 |
|
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef UACCESS_H
#define UACCESS_H
#include <linux/compiler.h>
extern void *__user_addr_min, *__user_addr_max;
static inline void __chk_user_ptr(const volatile void *p, size_t size)
{
assert(p >= __user_addr_min && p + size <= __user_addr_max);
}
#define put_user(x, ptr) \
({ \
typeof(ptr) __pu_ptr = (ptr); \
__chk_user_ptr(__pu_ptr, sizeof(*__pu_ptr)); \
WRITE_ONCE(*(__pu_ptr), x); \
0; \
})
#define get_user(x, ptr) \
({ \
typeof(ptr) __pu_ptr = (ptr); \
__chk_user_ptr(__pu_ptr, sizeof(*__pu_ptr)); \
x = READ_ONCE(*(__pu_ptr)); \
0; \
})
static void volatile_memcpy(volatile char *to, const volatile char *from,
unsigned long n)
{
while (n--)
*(to++) = *(from++);
}
static inline int copy_from_user(void *to, const void __user volatile *from,
unsigned long n)
{
__chk_user_ptr(from, n);
volatile_memcpy(to, from, n);
return 0;
}
static inline int copy_to_user(void __user volatile *to, const void *from,
unsigned long n)
{
__chk_user_ptr(to, n);
volatile_memcpy(to, from, n);
return 0;
}
#endif /* UACCESS_H */