[mirror_ubuntu-artful-kernel.git] / lib / usercopy.c

#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;
	might_fault();
	if (likely(access_ok(VERIFY_READ, from, n))) {
		kasan_check_write(to, n);
		res = raw_copy_from_user(to, from, n);
	}
	if (unlikely(res))
		memset(to + (n - res), 0, res);
	return res;
}
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)
{
	might_fault();
	if (likely(access_ok(VERIFY_WRITE, to, n))) {
		kasan_check_read(from, n);
		n = raw_copy_to_user(to, from, n);
	}
	return n;
}
EXPORT_SYMBOL(_copy_to_user);
#endif
Commit	Line	Data
d597580d AV	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;
9c5f6908 AV	9	might_fault();
	10	if (likely(access_ok(VERIFY_READ, from, n))) {
	11	kasan_check_write(to, n);
d597580d	12	res = raw_copy_from_user(to, from, n);
9c5f6908	13	}
d597580d AV	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	{
9c5f6908 AV	24	might_fault();
	25	if (likely(access_ok(VERIFY_WRITE, to, n))) {
	26	kasan_check_read(from, n);
d597580d	27	n = raw_copy_to_user(to, from, n);
9c5f6908	28	}
d597580d AV	29	return n;
	30	}
	31	EXPORT_SYMBOL(_copy_to_user);
	32	#endif