cregit-Linux how code gets into the kernel

Release 4.12 lib/usercopy.c

Directory: lib
#include <linux/uaccess.h>

/* out-of-line parts */

#ifndef INLINE_COPY_FROM_USER

unsigned long _copy_from_user(void *to, const void __user *from, unsigned long n) { unsigned long res = n; if (likely(access_ok(VERIFY_READ, from, n))) res = raw_copy_from_user(to, from, n); if (unlikely(res)) memset(to + (n - res), 0, res); return res; }

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EXPORT_SYMBOL(_copy_from_user); #endif #ifndef INLINE_COPY_TO_USER
unsigned long _copy_to_user(void *to, const void __user *from, unsigned long n) { if (likely(access_ok(VERIFY_WRITE, to, n))) n = raw_copy_to_user(to, from, n); return n; }

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EXPORT_SYMBOL(_copy_to_user); #endif

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Directory: lib
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