On Tue, Jun 2, 2020 at 1:33 PM Michael S. Tsirkin <m...@redhat.com> wrote: > > Hmm are you sure we can drop it? access_ok is done in the context > of the process. Access itself in the context of a kernel thread > that borrows the same mm. IIUC if the process can be 32 bit > while the kernel is 64 bit, access_ok in the context of the > kernel thread will not DTRT.
You're historically expected to just "set_fs()" when you do use_mm(). Then we fixed it in commit... Oh, when I look for it, I notice that it still hasn't gotten merged. It's still pending, see https://lore.kernel.org/lkml/20200416053158.586887-4-...@lst.de/ for the current thing. Linus
