On Thu, Sep 17, 2020 at 07:04:06PM +0200, Borislav Petkov wrote: > So actually, I'm thinking: > > .LMCE_during_user_access: > mov $-ENODEV, %eax > ASM_CLAC > ret > > I have no clue which error code we should put there but it should be an > error code which tells you not to retry and to back off immediately.
That does look a lot easier to understand *at this point* in the code. But the existing iterator code is not expecting an error code. Just a count of bytes not copied. So doing this would mean some surgery on the maze of giant #defines that is lib/iov_iter.c -Tony
