On Wed, Jan 17, 2018 at 10:52 AM, Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote: > On Wed, Jan 17, 2018 at 02:17:26PM +0000, Alan Cox wrote: [..] > Incidentally, what about copy_to_iter() and friends? They > check iov_iter flavour and go either into the "copy to kernel buffer" > or "copy to userland" paths. Do we need to deal with mispredictions > there? We are calling a bunch of those on read()... > Those should be protected by the conversion of __uaccess_begin to __uaccess_begin_nospec that includes the lfence.
