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