Re: [PATCH RFC] uaccess: user_access_begin_after_access_ok()

Al Viro
2020-06-04T15:03:42Z

On Thu, Jun 04, 2020 at 06:10:23AM -0400, Michael S. Tsirkin wrote:

> stac()
> for (i = 0; i < 64; ++i) {
> get_user(flags, desc[i].flags)
unsafe_get_user(), please.
> smp_rmb()
> if (!(flags & VALID))
> break;
> copy_from_user(&adesc[i], desc + i, sizeof adesc[i]);
... and that would raw_copy_from_user() (or unsafe_copy_from_user(),
for wrapper that would take a label to bugger off to)
> }
> clac()