long copy_from_user_nofault(void *dst, const void __user *src, size_t size)
{
long ret = -EFAULT;
- mm_segment_t old_fs = get_fs();
+ mm_segment_t old_fs = force_uaccess_begin();
- set_fs(USER_DS);
if (access_ok(src, size)) {
pagefault_disable();
ret = __copy_from_user_inatomic(dst, src, size);
pagefault_enable();
}
- set_fs(old_fs);
+ force_uaccess_end(old_fs);
if (ret)
return -EFAULT;
long copy_to_user_nofault(void __user *dst, const void *src, size_t size)
{
long ret = -EFAULT;
- mm_segment_t old_fs = get_fs();
+ mm_segment_t old_fs = force_uaccess_begin();
- set_fs(USER_DS);
if (access_ok(dst, size)) {
pagefault_disable();
ret = __copy_to_user_inatomic(dst, src, size);
pagefault_enable();
}
- set_fs(old_fs);
+ force_uaccess_end(old_fs);
if (ret)
return -EFAULT;
long strncpy_from_user_nofault(char *dst, const void __user *unsafe_addr,
long count)
{
- mm_segment_t old_fs = get_fs();
+ mm_segment_t old_fs;
long ret;
if (unlikely(count <= 0))
return 0;
- set_fs(USER_DS);
+ old_fs = force_uaccess_begin();
pagefault_disable();
ret = strncpy_from_user(dst, unsafe_addr, count);
pagefault_enable();
- set_fs(old_fs);
+ force_uaccess_end(old_fs);
if (ret >= count) {
ret = count;
*/
long strnlen_user_nofault(const void __user *unsafe_addr, long count)
{
- mm_segment_t old_fs = get_fs();
+ mm_segment_t old_fs;
int ret;
- set_fs(USER_DS);
+ old_fs = force_uaccess_begin();
pagefault_disable();
ret = strnlen_user(unsafe_addr, count);
pagefault_enable();
- set_fs(old_fs);
+ force_uaccess_end(old_fs);
return ret;
}