54  * Architectures should provide two primitives (raw_copy_{to,from}_user())
55  * and get rid of their private instances of copy_{to,from}_user() and
56  * __copy_{to,from}_user{,_inatomic}().
58  * raw_copy_{to,from}_user(to, from, size) should copy up to size bytes and
63  * Both of these functions should attempt to copy size bytes starting at from
68  * If raw_copy_{to,from}_user(to, from, size) returns N, size - N bytes starting
69  * at to must become equal to the bytes fetched from the corresponding area
70  * starting at from.  All data past to + size - N must be left unmodified.
79  * on store should happen.  Interpretation of from is affected by set_fs().
84  * the 6 functions (copy_{to,from}_user(), __copy_{to,from}_user_inatomic())
86  * copy_{to,from}_user() might or might not be inlined.  If you want them
87  * inlined, have asm/uaccess.h define INLINE_COPY_{TO,FROM}_USER.
99 __copy_from_user_inatomic(void *to, const void __user *from, unsigned long n)  in __copy_from_user_inatomic()  argument
101 	instrument_copy_from_user(to, from, n);  in __copy_from_user_inatomic()
103 	return raw_copy_from_user(to, from, n);  in __copy_from_user_inatomic()
107 __copy_from_user(void *to, const void __user *from, unsigned long n)  in __copy_from_user()  argument
112 	instrument_copy_from_user(to, from, n);  in __copy_from_user()
114 	return raw_copy_from_user(to, from, n);  in __copy_from_user()
120  * @from: Source address, in kernel space.
125  * Copy data from kernel space to user space.  Caller must check
131 __copy_to_user_inatomic(void __user *to, const void *from, unsigned long n)  in __copy_to_user_inatomic()  argument
135 	instrument_copy_to_user(to, from, n);  in __copy_to_user_inatomic()
136 	check_object_size(from, n, true);  in __copy_to_user_inatomic()
137 	return raw_copy_to_user(to, from, n);  in __copy_to_user_inatomic()
141 __copy_to_user(void __user *to, const void *from, unsigned long n)  in __copy_to_user()  argument
146 	instrument_copy_to_user(to, from, n);  in __copy_to_user()
147 	check_object_size(from, n, true);  in __copy_to_user()
148 	return raw_copy_to_user(to, from, n);  in __copy_to_user()
153 _copy_from_user(void *to, const void __user *from, unsigned long n)  in _copy_from_user()  argument
157 	if (!should_fail_usercopy() && likely(access_ok(from, n))) {  in _copy_from_user()
158 		instrument_copy_from_user(to, from, n);  in _copy_from_user()
159 		res = raw_copy_from_user(to, from, n);  in _copy_from_user()
172 _copy_to_user(void __user *to, const void *from, unsigned long n)  in _copy_to_user()  argument
178 		instrument_copy_to_user(to, from, n);  in _copy_to_user()
179 		n = raw_copy_to_user(to, from, n);  in _copy_to_user()
189 copy_from_user(void *to, const void __user *from, unsigned long n)  in copy_from_user()  argument
192 		n = _copy_from_user(to, from, n);  in copy_from_user()
197 copy_to_user(void __user *to, const void *from, unsigned long n)  in copy_to_user()  argument
199 	if (likely(check_copy_size(from, n, true)))  in copy_to_user()
200 		n = _copy_to_user(to, from, n);  in copy_to_user()
205 copy_in_user(void __user *to, const void __user *from, unsigned long n)  in copy_in_user()  argument
208 	if (access_ok(to, n) && access_ok(from, n))  in copy_in_user()
209 		n = raw_copy_in_user(to, from, n);  in copy_in_user()
241  * User access methods will not sleep when called from a pagefault_disabled()
287 __copy_from_user_inatomic_nocache(void *to, const void __user *from,  in __copy_from_user_inatomic_nocache()  argument
290 	return __copy_from_user_inatomic(to, from, n);  in __copy_from_user_inatomic_nocache()
295 extern __must_check int check_zeroed_user(const void __user *from, size_t size);
298  * copy_struct_from_user: copy a struct from userspace
305  * Copies a struct from userspace to kernel space, in a way that guarantees
382  * get_kernel_nofault(): safely attempt to read from a location
384  * @ptr: address to read from