Show user0.c syntax highlighted
unsigned long copy_from_user(void $user * $kernel to, void * $user from, unsigned long n);
$$a _op_deref ($$a *$kernel x);
struct msg {
char *buf;
};
void dev_ioctl(long arg)
{
struct msg m;
char c;
copy_from_user(&m, (void*)arg, sizeof (m));
c = m.buf[0];
}
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