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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 __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 | } | |
32 | EXPORT_SYMBOL(_copy_to_user); | |
33 | #endif |