#ifndef __SKAS_UACCESS_H
#define __SKAS_UACCESS_H
-#include "linux/string.h"
-#include "linux/sched.h"
-#include "linux/err.h"
-#include "asm/processor.h"
-#include "asm/pgtable.h"
#include "asm/errno.h"
-#include "asm/current.h"
-#include "asm/a.out.h"
-#include "kern_util.h"
#define access_ok_skas(type, addr, size) \
((segment_eq(get_fs(), KERNEL_DS)) || \
(((unsigned long) (addr) < TASK_SIZE) && \
- ((unsigned long) (addr) + (size) < TASK_SIZE)))
+ ((unsigned long) (addr) + (size) <= TASK_SIZE)))
static inline int verify_area_skas(int type, const void * addr,
unsigned long size)
return(access_ok_skas(type, addr, size) ? 0 : -EFAULT);
}
-static inline unsigned long maybe_map(unsigned long virt, int is_write)
-{
- pte_t pte;
-
- void *phys = um_virt_to_phys(current, virt, &pte);
- int dummy_code;
-
- if(IS_ERR(phys) || (is_write && !pte_write(pte))){
- if(handle_page_fault(virt, 0, is_write, 0, &dummy_code))
- return(0);
- phys = um_virt_to_phys(current, virt, NULL);
- }
- return((unsigned long) __va((unsigned long) phys));
-}
-
-static inline int buffer_op(unsigned long addr, int len,
- int (*op)(unsigned long addr, int len, void *arg),
- void *arg)
-{
- int size = min(PAGE_ALIGN(addr) - addr, (unsigned long) len);
- int remain = len, n;
-
- n = (*op)(addr, size, arg);
- if(n != 0)
- return(n < 0 ? remain : 0);
-
- addr += size;
- remain -= size;
- if(remain == 0)
- return(0);
-
- while(addr < ((addr + remain) & PAGE_MASK)){
- n = (*op)(addr, PAGE_SIZE, arg);
- if(n != 0)
- return(n < 0 ? remain : 0);
-
- addr += PAGE_SIZE;
- remain -= PAGE_SIZE;
- }
- if(remain == 0)
- return(0);
-
- n = (*op)(addr, remain, arg);
- if(n != 0)
- return(n < 0 ? remain : 0);
- return(0);
-}
-
-static inline int copy_chunk_from_user(unsigned long from, int len, void *arg)
-{
- unsigned long *to_ptr = arg, to = *to_ptr;
-
- from = maybe_map(from, 0);
- if(from == 0)
- return(-1);
-
- memcpy((void *) to, (void *) from, len);
- *to_ptr += len;
- return(0);
-}
-
-static inline int copy_from_user_skas(void *to, const void *from, int n)
-{
- if(segment_eq(get_fs(), KERNEL_DS)){
- memcpy(to, from, n);
- return(0);
- }
-
- return(access_ok_skas(VERIFY_READ, from, n) ?
- buffer_op((unsigned long) from, n, copy_chunk_from_user, &to) :
- n);
-}
-
-static inline int copy_chunk_to_user(unsigned long to, int len, void *arg)
-{
- unsigned long *from_ptr = arg, from = *from_ptr;
-
- to = maybe_map(to, 1);
- if(to == 0)
- return(-1);
-
- memcpy((void *) to, (void *) from, len);
- *from_ptr += len;
- return(0);
-}
-
-static inline int copy_to_user_skas(void *to, const void *from, int n)
-{
- if(segment_eq(get_fs(), KERNEL_DS)){
- memcpy(to, from, n);
- return(0);
- }
-
- return(access_ok_skas(VERIFY_WRITE, to, n) ?
- buffer_op((unsigned long) to, n, copy_chunk_to_user, &from) :
- n);
-}
-
-static inline int strncpy_chunk_from_user(unsigned long from, int len,
- void *arg)
-{
- char **to_ptr = arg, *to = *to_ptr;
- int n;
-
- from = maybe_map(from, 0);
- if(from == 0)
- return(-1);
-
- strncpy(to, (void *) from, len);
- n = strnlen(to, len);
- *to_ptr += n;
-
- if(n < len)
- return(1);
- return(0);
-}
-
-static inline int strncpy_from_user_skas(char *dst, const char *src, int count)
-{
- int n;
- char *ptr = dst;
-
- if(segment_eq(get_fs(), KERNEL_DS)){
- strncpy(dst, src, count);
- return(strnlen(dst, count));
- }
-
- if(!access_ok_skas(VERIFY_READ, src, 1))
- return(-EFAULT);
-
- n = buffer_op((unsigned long) src, count, strncpy_chunk_from_user,
- &ptr);
- if(n != 0)
- return(-EFAULT);
- return(strnlen(dst, count));
-}
-
-static inline int clear_chunk(unsigned long addr, int len, void *unused)
-{
- addr = maybe_map(addr, 1);
- if(addr == 0)
- return(-1);
-
- memset((void *) addr, 0, len);
- return(0);
-}
-
-static inline int __clear_user_skas(void *mem, int len)
-{
- return(buffer_op((unsigned long) mem, len, clear_chunk, NULL));
-}
-
-static inline int clear_user_skas(void *mem, int len)
-{
- if(segment_eq(get_fs(), KERNEL_DS)){
- memset(mem, 0, len);
- return(0);
- }
-
- return(access_ok_skas(VERIFY_WRITE, mem, len) ?
- buffer_op((unsigned long) mem, len, clear_chunk, NULL) : len);
-}
-
-static inline int strnlen_chunk(unsigned long str, int len, void *arg)
-{
- int *len_ptr = arg, n;
-
- str = maybe_map(str, 0);
- if(str == 0)
- return(-1);
-
- n = strnlen((void *) str, len);
- *len_ptr += n;
-
- if(n < len)
- return(1);
- return(0);
-}
-
-static inline int strnlen_user_skas(const void *str, int len)
-{
- int count = 0, n;
-
- if(segment_eq(get_fs(), KERNEL_DS))
- return(strnlen(str, len) + 1);
-
- n = buffer_op((unsigned long) str, len, strnlen_chunk, &count);
- if(n == 0)
- return(count + 1);
- return(-EFAULT);
-}
+extern int copy_from_user_skas(void *to, const void *from, int n);
+extern int copy_to_user_skas(void *to, const void *from, int n);
+extern int strncpy_from_user_skas(char *dst, const char *src, int count);
+extern int __clear_user_skas(void *mem, int len);
+extern int clear_user_skas(void *mem, int len);
+extern int strnlen_user_skas(const void *str, int len);
#endif
git://git.onelab.eu / linux-2.6.git / blobdiff