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)))
+ 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;
#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)))
+ 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);