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, -- MST
