From patchwork Mon Feb 2 07:59:37 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Al Viro X-Patchwork-Id: 5759681 Return-Path: X-Original-To: patchwork-kvm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 09FD39F336 for ; Mon, 2 Feb 2015 08:00:00 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 410B620253 for ; Mon, 2 Feb 2015 07:59:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EFE162015E for ; Mon, 2 Feb 2015 07:59:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932881AbbBBH7s (ORCPT ); Mon, 2 Feb 2015 02:59:48 -0500 Received: from zeniv.linux.org.uk ([195.92.253.2]:32988 "EHLO ZenIV.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932859AbbBBH7k (ORCPT ); Mon, 2 Feb 2015 02:59:40 -0500 Received: from viro by ZenIV.linux.org.uk with local (Exim 4.76 #1 (Red Hat Linux)) id 1YIBv0-0004cQ-TY; Mon, 02 Feb 2015 07:59:38 +0000 From: Al Viro To: David Miller Cc: netdev@vger.kernel.org, "Michael S. Tsirkin" , "Nicholas A. Bellinger" , kvm@vger.kernel.org Subject: [PATCH v2 18/18] vhost: vhost_scsi_handle_vq() should just use copy_from_user() Date: Mon, 2 Feb 2015 07:59:37 +0000 Message-Id: <1422863977-17668-18-git-send-email-viro@ZenIV.linux.org.uk> X-Mailer: git-send-email 1.7.7.6 In-Reply-To: <20150131035513.GK29656@ZenIV.linux.org.uk> References: <20150131035513.GK29656@ZenIV.linux.org.uk> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Al Viro it has just verified that it asks no more than the length of the first segment of iovec. And with that the last user of stuff in lib/iovec.c is gone. RIP. Cc: Michael S. Tsirkin Cc: Nicholas A. Bellinger Cc: kvm@vger.kernel.org Signed-off-by: Al Viro Acked-by: Michael S. Tsirkin --- drivers/vhost/scsi.c | 2 +- include/linux/uio.h | 2 -- lib/Makefile | 2 +- lib/iovec.c | 36 ------------------------------------ 4 files changed, 2 insertions(+), 40 deletions(-) delete mode 100644 lib/iovec.c diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c index d695b16..dc78d87 100644 --- a/drivers/vhost/scsi.c +++ b/drivers/vhost/scsi.c @@ -1079,7 +1079,7 @@ vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) req_size, vq->iov[0].iov_len); break; } - ret = memcpy_fromiovecend(req, &vq->iov[0], 0, req_size); + ret = copy_from_user(req, vq->iov[0].iov_base, req_size); if (unlikely(ret)) { vq_err(vq, "Faulted on virtio_scsi_cmd_req\n"); break; diff --git a/include/linux/uio.h b/include/linux/uio.h index 02bd8a9..3e0cb4e 100644 --- a/include/linux/uio.h +++ b/include/linux/uio.h @@ -135,6 +135,4 @@ static inline void iov_iter_reexpand(struct iov_iter *i, size_t count) size_t csum_and_copy_to_iter(void *addr, size_t bytes, __wsum *csum, struct iov_iter *i); size_t csum_and_copy_from_iter(void *addr, size_t bytes, __wsum *csum, struct iov_iter *i); -int memcpy_fromiovecend(unsigned char *kdata, const struct iovec *iov, - int offset, int len); #endif diff --git a/lib/Makefile b/lib/Makefile index 3c3b30b..1071d06 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -24,7 +24,7 @@ obj-y += lockref.o obj-y += bcd.o div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \ bust_spinlocks.o hexdump.o kasprintf.o bitmap.o scatterlist.o \ - gcd.o lcm.o list_sort.o uuid.o flex_array.o iovec.o clz_ctz.o \ + gcd.o lcm.o list_sort.o uuid.o flex_array.o clz_ctz.o \ bsearch.o find_last_bit.o find_next_bit.o llist.o memweight.o kfifo.o \ percpu-refcount.o percpu_ida.o rhashtable.o reciprocal_div.o obj-y += string_helpers.o diff --git a/lib/iovec.c b/lib/iovec.c deleted file mode 100644 index d8f17a9..0000000 --- a/lib/iovec.c +++ /dev/null @@ -1,36 +0,0 @@ -#include -#include -#include - -/* - * Copy iovec to kernel. Returns -EFAULT on error. - */ - -int memcpy_fromiovecend(unsigned char *kdata, const struct iovec *iov, - int offset, int len) -{ - /* No data? Done! */ - if (len == 0) - return 0; - - /* Skip over the finished iovecs */ - while (offset >= iov->iov_len) { - offset -= iov->iov_len; - iov++; - } - - while (len > 0) { - u8 __user *base = iov->iov_base + offset; - int copy = min_t(unsigned int, len, iov->iov_len - offset); - - offset = 0; - if (copy_from_user(kdata, base, copy)) - return -EFAULT; - len -= copy; - kdata += copy; - iov++; - } - - return 0; -} -EXPORT_SYMBOL(memcpy_fromiovecend);