From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 717ECECE58E for ; Thu, 17 Oct 2019 19:40:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4B7B720650 for ; Thu, 17 Oct 2019 19:40:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2440284AbfJQTkB (ORCPT ); Thu, 17 Oct 2019 15:40:01 -0400 Received: from zeniv.linux.org.uk ([195.92.253.2]:45070 "EHLO ZenIV.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2437782AbfJQTjp (ORCPT ); Thu, 17 Oct 2019 15:39:45 -0400 Received: from viro by ZenIV.linux.org.uk with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1iLBce-0006fd-7Z; Thu, 17 Oct 2019 19:39:44 +0000 From: Al Viro To: linux-scsi@vger.kernel.org Cc: Linus Torvalds , linux-kernel@vger.kernel.org, Al Viro Subject: [RFC PATCH 7/8] sg_write(): get rid of access_ok()/__copy_from_user()/__get_user() Date: Thu, 17 Oct 2019 20:39:24 +0100 Message-Id: <20191017193925.25539-7-viro@ZenIV.linux.org.uk> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191017193925.25539-1-viro@ZenIV.linux.org.uk> References: <20191017193659.GA18702@ZenIV.linux.org.uk> <20191017193925.25539-1-viro@ZenIV.linux.org.uk> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Al Viro Just use plain copy_from_user() and get_user(). Note that while a buf-derived pointer gets stored into ->dxferp, all places that actually use the resulting value feed it either to import_iovec() or to import_single_range(), and both will do validation. Signed-off-by: Al Viro --- drivers/scsi/sg.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c index 9f6534a025cd..f3d090b93cdf 100644 --- a/drivers/scsi/sg.c +++ b/drivers/scsi/sg.c @@ -612,11 +612,9 @@ sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) scsi_block_when_processing_errors(sdp->device))) return -ENXIO; - if (!access_ok(buf, count)) - return -EFAULT; /* protects following copy_from_user()s + get_user()s */ if (count < SZ_SG_HEADER) return -EIO; - if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) + if (copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) return -EFAULT; blocking = !(filp->f_flags & O_NONBLOCK); if (old_hdr.reply_len < 0) @@ -626,7 +624,7 @@ sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) return -EIO; /* The minimum scsi command length is 6 bytes. */ buf += SZ_SG_HEADER; - if (__get_user(opcode, buf)) + if (get_user(opcode, buf)) return -EFAULT; if (!(srp = sg_add_request(sfp))) { @@ -676,7 +674,7 @@ sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) hp->flags = input_size; /* structure abuse ... */ hp->pack_id = old_hdr.pack_id; hp->usr_ptr = NULL; - if (__copy_from_user(cmnd, buf, cmd_size)) + if (copy_from_user(cmnd, buf, cmd_size)) return -EFAULT; /* * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, -- 2.11.0