On Fri, Nov 30, 2018 at 11:01:03AM -0800, Bijan Mottahedeh wrote: > On 11/30/2018 5:44 AM, Michael S. Tsirkin wrote: > > On Thu, Nov 01, 2018 at 04:06:19PM -0700, Linus Torvalds wrote: > > > On Thu, Nov 1, 2018 at 4:00 PM Kees Cook <keescook@xxxxxxxxxxxx> wrote: > > > > + memset(&rsp, 0, sizeof(rsp)); > > > > + rsp.response = VIRTIO_SCSI_S_FUNCTION_REJECTED; > > > > + resp = vq->iov[out].iov_base; > > > > + ret = __copy_to_user(resp, &rsp, sizeof(rsp)); > > > > > > > > Is it actually safe to trust that iov_base has passed an earlier > > > > access_ok() check here? Why not just use copy_to_user() instead? > > > Good point. > > > > > > We really should have removed those double-underscore things ages ago. > > > > > > Also, apart from the address, what about the size? Wouldn't it be > > > better to use copy_to_iter() rather than implement it badly by hand? > > > > > > Linus > > Bijan can you respond please? > > Are you going to look into this and convert code to copy_to_iter? > > I don't think we should release Linux like this, so if you don't > > have the time I'd rather revert for now and you can look > > into reposting for the next release. > > > > Thanks, > > > > Sure, will do. Can I send an individual patch for the fix to > vhost_scsi_send_tmf_reject()? > > Thanks. > > --bijan Please go ahead. -- MST
