1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/uaccess.h>
 3
 4/* out-of-line parts */
 5
 6#ifndef INLINE_COPY_FROM_USER
 7unsigned long _copy_from_user(void *to, const void __user *from, unsigned long n)
 8{
 9	unsigned long res = n;
10	might_fault();
11	if (likely(access_ok(VERIFY_READ, from, n))) {
12		kasan_check_write(to, n);
13		res = raw_copy_from_user(to, from, n);
14	}
15	if (unlikely(res))
16		memset(to + (n - res), 0, res);
17	return res;
18}
19EXPORT_SYMBOL(_copy_from_user);
20#endif
21
22#ifndef INLINE_COPY_TO_USER
23unsigned long _copy_to_user(void __user *to, const void *from, unsigned long n)
24{
25	might_fault();
26	if (likely(access_ok(VERIFY_WRITE, to, n))) {
27		kasan_check_read(from, n);
28		n = raw_copy_to_user(to, from, n);
29	}
30	return n;
31}
32EXPORT_SYMBOL(_copy_to_user);
33#endif