unsigned long __clear_user(void __user *mem, unsigned long len)
{
if (uaccess_kernel()) {
memset((__force void*)mem, 0, len);
return 0;
}
return buffer_op((unsigned long) mem, len, 1, clear_chunk, NULL);
}
unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n)
{
if (uaccess_kernel()) {
memcpy((__force void *) to, from, n);
return 0;
}
return buffer_op((unsigned long) to, n, 1, copy_chunk_to_user, &from);
}
unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n)
{
if (uaccess_kernel()) {
memcpy(to, (__force void*)from, n);
return 0;
}
return buffer_op((unsigned long) from, n, 0, copy_chunk_from_user, &to);
}
int clear_user(void __user *mem, int len)
{
if (segment_eq(get_fs(), KERNEL_DS)) {
memset((__force void*)mem, 0, len);
return 0;
}
return access_ok(VERIFY_WRITE, mem, len) ?
buffer_op((unsigned long) mem, len, 1, clear_chunk, NULL) : len;
}
int copy_to_user(void __user *to, const void *from, int n)
{
if (segment_eq(get_fs(), KERNEL_DS)) {
memcpy((__force void *) to, from, n);
return 0;
}
return access_ok(VERIFY_WRITE, to, n) ?
buffer_op((unsigned long) to, n, 1, copy_chunk_to_user, &from) :
n;
}
int copy_from_user(void *to, const void __user *from, int n)
{
if (segment_eq(get_fs(), KERNEL_DS)) {
memcpy(to, (__force void*)from, n);
return 0;
}
return access_ok(VERIFY_READ, from, n) ?
buffer_op((unsigned long) from, n, 0, copy_chunk_from_user, &to):
n;
}
long __strnlen_user(const void __user *str, long len)
{
int count = 0, n;
if (uaccess_kernel())
return strnlen((__force char*)str, len) + 1;
n = buffer_op((unsigned long) str, len, 0, strnlen_chunk, &count);
if (n == 0)
return count + 1;
return 0;
}
int strnlen_user(const void __user *str, int len)
{
int count = 0, n;
if (segment_eq(get_fs(), KERNEL_DS))
return strnlen((__force char*)str, len) + 1;
n = buffer_op((unsigned long) str, len, 0, strnlen_chunk, &count);
if (n == 0)
return count + 1;
return -EFAULT;
}
long __strncpy_from_user(char *dst, const char __user *src, long count)
{
long n;
char *ptr = dst;
if (uaccess_kernel()) {
strncpy(dst, (__force void *) src, count);
return strnlen(dst, count);
}
n = buffer_op((unsigned long) src, count, 0, strncpy_chunk_from_user,
&ptr);
if (n != 0)
return -EFAULT;
return strnlen(dst, count);
}
int strncpy_from_user(char *dst, const char __user *src, int count)
{
int n;
char *ptr = dst;
if (segment_eq(get_fs(), KERNEL_DS)) {
strncpy(dst, (__force void *) src, count);
return strnlen(dst, count);
}
if (!access_ok(VERIFY_READ, src, 1))
return -EFAULT;
n = buffer_op((unsigned long) src, count, 0, strncpy_chunk_from_user,
&ptr);
if (n != 0)
return -EFAULT;
return strnlen(dst, count);
}
int __clear_user(void __user *mem, int len)
{
return buffer_op((unsigned long) mem, len, 1, clear_chunk, NULL);
}
