Re: [PATCH 1/2] random: convert to using fops->read_iter()

[Jason A. Donenfeld]

Hi Al,

On Fri, May 20, 2022 at 03:11:06AM +0000, Al Viro wrote:
> >  SYSCALL_DEFINE3(getrandom, char __user *, ubuf, size_t, len,
> >  unsigned int, flags) { +	struct iovec iov = { .iov_base = ubuf };
> >  +	struct iov_iter iter;
> 
> 	import_single_range(READ, ubuf, len, &iov, &iter)
> 
> (note, BTW, that this'll cap len)

I'll incorporate this and send a v4. import_single_range does an
access_ok(), but I would hope that copy_to_iter() also does similar
checks. Does that make this less efficient?

Jason