On Wed, Nov 03, 2021 at 01:22:58PM -0700, Yang Shi wrote: > commit a4aeaa06d45e90f9b279f0b09de84bd00006e733 upstream. > > The read-only THP for filesystems will collapse THP for files opened > readonly and mapped with VM_EXEC. The intended usecase is to avoid TLB > misses for large text segments. But it doesn't restrict the file types > so a THP could be collapsed for a non-regular file, for example, block > device, if it is opened readonly and mapped with EXEC permission. This > may cause bugs, like [1] and [2]. > > This is definitely not the intended usecase, so just collapse THP for > regular files in order to close the attack surface. > > [shy828301@xxxxxxxxx: fix vm_file check [3]] Now queued up, thanks. greg k-h
