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