mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 00:00:52 +07:00
a0e94598e6
Destination is a kernel pointer and source - a userland one
in _copy_from_user(); _copy_to_user() is the other way round.
Fixes: d597580d37 ("generic ...copy_..._user primitives")
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
34 lines
764 B
C
34 lines
764 B
C
// SPDX-License-Identifier: GPL-2.0
|
|
#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 __user *to, const void *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
|