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 7 unsigned 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 } 19 EXPORT_SYMBOL(_copy_from_user); 20 #endif 21 22 #ifndef INLINE_COPY_TO_USER 23 unsigned long _copy_to_user(void *to, const void __user *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 } 32 EXPORT_SYMBOL(_copy_to_user); 33 #endif 34