From patchwork Sat Jul 24 07:20:27 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 485517 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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, 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 03302C4338F for ; Sat, 24 Jul 2021 07:31:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CB10B60E93 for ; Sat, 24 Jul 2021 07:31:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234451AbhGXGvL (ORCPT ); Sat, 24 Jul 2021 02:51:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37400 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234379AbhGXGvL (ORCPT ); Sat, 24 Jul 2021 02:51:11 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 132FDC061575; Sat, 24 Jul 2021 00:31:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=TXLjCGBzNCraw3wgHQUk1fiA2PWPevl08M+7WuaBaFo=; b=tvo/hjLrPXk4ow3N4spaEcAink JOLpHRy/BKDW7juInnFZaAXqsxGVN8JVGVGj+7ecaZall11LZ5d2/BYfKSYr6KoTsmN+xSMiv8HqF 86pPAwPkvGzGexSCiAEFPQCslGIs/yOuXRKe+/qCX36ptWRDEL8q/ytl+pmnUSw3iy+tvFt/NQsHi OPx+PHPnHtkK9G45owCilucCGfNhaxM6E0p6acr9Wus7A2iZayxXqjejUlomyrpI6aL1wErWSQqye TBnCE98vwZK1YQDpCHhJ1ByD7o8Fg5m+JknEupSccqYBjN8xrvRTr96Kn1y7FoycYihv4gLXQbddJ SdYCSoFA==; Received: from [2001:4bb8:184:87c5:85d0:a26b:ef67:d32c] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1m7C7K-00C5U9-Jl; Sat, 24 Jul 2021 07:30:47 +0000 From: Christoph Hellwig To: "Martin K. Petersen" , Jens Axboe , FUJITA Tomonori Cc: Doug Gilbert , =?utf-8?q?Kai_M=C3=A4kisara?= , linux-block@vger.kernel.org, linux-scsi@vger.kernel.org Subject: [PATCH 18/24] scsi_ioctl: move the "block layer" SCSI ioctl handling to drivers/scsi Date: Sat, 24 Jul 2021 09:20:27 +0200 Message-Id: <20210724072033.1284840-19-hch@lst.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210724072033.1284840-1-hch@lst.de> References: <20210724072033.1284840-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Merge the ioctl handling in block/scsi_ioctl.c into its only caller in drivers/scsi/scsi_ioctl.c. Signed-off-by: Christoph Hellwig Signed-off-by: Halil Pasic Reviewed-by: Christoph Hellwig --- block/Makefile | 1 - block/scsi_ioctl.c | 796 -------------------------------------- drivers/scsi/scsi_ioctl.c | 740 ++++++++++++++++++++++++++++++++++- include/linux/blkdev.h | 11 - include/scsi/scsi_ioctl.h | 6 + 5 files changed, 741 insertions(+), 813 deletions(-) delete mode 100644 block/scsi_ioctl.c diff --git a/block/Makefile b/block/Makefile index f37d532c8da5..640afba070fd 100644 --- a/block/Makefile +++ b/block/Makefile @@ -12,7 +12,6 @@ obj-$(CONFIG_BLOCK) := bio.o elevator.o blk-core.o blk-sysfs.o \ disk-events.o obj-$(CONFIG_BOUNCE) += bounce.o -obj-$(CONFIG_BLK_SCSI_REQUEST) += scsi_ioctl.o obj-$(CONFIG_BLK_DEV_BSG_COMMON) += bsg.o obj-$(CONFIG_BLK_DEV_BSGLIB) += bsg-lib.o obj-$(CONFIG_BLK_CGROUP) += blk-cgroup.o diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c deleted file mode 100644 index 3642e145108a..000000000000 --- a/block/scsi_ioctl.c +++ /dev/null @@ -1,796 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Copyright (C) 2001 Jens Axboe - */ -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include -#include -#include - -static int sg_get_version(int __user *p) -{ - static const int sg_version_num = 30527; - return put_user(sg_version_num, p); -} - -static int sg_get_timeout(struct request_queue *q) -{ - return jiffies_to_clock_t(q->sg_timeout); -} - -static int sg_set_timeout(struct request_queue *q, int __user *p) -{ - int timeout, err = get_user(timeout, p); - - if (!err) - q->sg_timeout = clock_t_to_jiffies(timeout); - - return err; -} - -static int sg_get_reserved_size(struct request_queue *q, int __user *p) -{ - int val = min(q->sg_reserved_size, queue_max_bytes(q)); - - return put_user(val, p); -} - -static int sg_set_reserved_size(struct request_queue *q, int __user *p) -{ - int size, err = get_user(size, p); - - if (err) - return err; - - if (size < 0) - return -EINVAL; - - q->sg_reserved_size = min_t(unsigned int, size, queue_max_bytes(q)); - return 0; -} - -/* - * will always return that we are ATAPI even for a real SCSI drive, I'm not - * so sure this is worth doing anything about (why would you care??) - */ -static int sg_emulated_host(struct request_queue *q, int __user *p) -{ - return put_user(1, p); -} - -/* - * Check if the given command is allowed. - * - * For unprivileged users only a small set of whitelisted command is allowed so - * that they can't format the drive or update the firmware. - */ -bool scsi_cmd_allowed(unsigned char *cmd, fmode_t mode) -{ - /* root can do any command. */ - if (capable(CAP_SYS_RAWIO)) - return true; - - /* Anybody who can open the device can do a read-safe command */ - switch (cmd[0]) { - /* Basic read-only commands */ - case TEST_UNIT_READY: - case REQUEST_SENSE: - case READ_6: - case READ_10: - case READ_12: - case READ_16: - case READ_BUFFER: - case READ_DEFECT_DATA: - case READ_CAPACITY: /* also GPCMD_READ_CDVD_CAPACITY */ - case READ_LONG: - case INQUIRY: - case MODE_SENSE: - case MODE_SENSE_10: - case LOG_SENSE: - case START_STOP: - case GPCMD_VERIFY_10: - case VERIFY_16: - case REPORT_LUNS: - case SERVICE_ACTION_IN_16: - case RECEIVE_DIAGNOSTIC: - case MAINTENANCE_IN: /* also GPCMD_SEND_KEY, which is a write command */ - case GPCMD_READ_BUFFER_CAPACITY: - /* Audio CD commands */ - case GPCMD_PLAY_CD: - case GPCMD_PLAY_AUDIO_10: - case GPCMD_PLAY_AUDIO_MSF: - case GPCMD_PLAY_AUDIO_TI: - case GPCMD_PAUSE_RESUME: - /* CD/DVD data reading */ - case GPCMD_READ_CD: - case GPCMD_READ_CD_MSF: - case GPCMD_READ_DISC_INFO: - case GPCMD_READ_DVD_STRUCTURE: - case GPCMD_READ_HEADER: - case GPCMD_READ_TRACK_RZONE_INFO: - case GPCMD_READ_SUBCHANNEL: - case GPCMD_READ_TOC_PMA_ATIP: - case GPCMD_REPORT_KEY: - case GPCMD_SCAN: - case GPCMD_GET_CONFIGURATION: - case GPCMD_READ_FORMAT_CAPACITIES: - case GPCMD_GET_EVENT_STATUS_NOTIFICATION: - case GPCMD_GET_PERFORMANCE: - case GPCMD_SEEK: - case GPCMD_STOP_PLAY_SCAN: - /* ZBC */ - case ZBC_IN: - return true; - /* Basic writing commands */ - case WRITE_6: - case WRITE_10: - case WRITE_VERIFY: - case WRITE_12: - case WRITE_VERIFY_12: - case WRITE_16: - case WRITE_LONG: - case WRITE_LONG_2: - case WRITE_SAME: - case WRITE_SAME_16: - case WRITE_SAME_32: - case ERASE: - case GPCMD_MODE_SELECT_10: - case MODE_SELECT: - case LOG_SELECT: - case GPCMD_BLANK: - case GPCMD_CLOSE_TRACK: - case GPCMD_FLUSH_CACHE: - case GPCMD_FORMAT_UNIT: - case GPCMD_REPAIR_RZONE_TRACK: - case GPCMD_RESERVE_RZONE_TRACK: - case GPCMD_SEND_DVD_STRUCTURE: - case GPCMD_SEND_EVENT: - case GPCMD_SEND_OPC: - case GPCMD_SEND_CUE_SHEET: - case GPCMD_SET_SPEED: - case GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL: - case GPCMD_LOAD_UNLOAD: - case GPCMD_SET_STREAMING: - case GPCMD_SET_READ_AHEAD: - /* ZBC */ - case ZBC_OUT: - return (mode & FMODE_WRITE); - default: - return false; - } -} -EXPORT_SYMBOL(scsi_cmd_allowed); - -static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq, - struct sg_io_hdr *hdr, fmode_t mode) -{ - struct scsi_request *req = scsi_req(rq); - - if (copy_from_user(req->cmd, hdr->cmdp, hdr->cmd_len)) - return -EFAULT; - if (!scsi_cmd_allowed(req->cmd, mode)) - return -EPERM; - - /* - * fill in request structure - */ - req->cmd_len = hdr->cmd_len; - - rq->timeout = msecs_to_jiffies(hdr->timeout); - if (!rq->timeout) - rq->timeout = q->sg_timeout; - if (!rq->timeout) - rq->timeout = BLK_DEFAULT_SG_TIMEOUT; - if (rq->timeout < BLK_MIN_SG_TIMEOUT) - rq->timeout = BLK_MIN_SG_TIMEOUT; - - return 0; -} - -static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr, - struct bio *bio) -{ - struct scsi_request *req = scsi_req(rq); - int r, ret = 0; - - /* - * fill in all the output members - */ - hdr->status = req->result & 0xff; - hdr->masked_status = status_byte(req->result); - hdr->msg_status = COMMAND_COMPLETE; - hdr->host_status = host_byte(req->result); - hdr->driver_status = 0; - if (scsi_status_is_check_condition(hdr->status)) - hdr->driver_status = DRIVER_SENSE; - hdr->info = 0; - if (hdr->masked_status || hdr->host_status || hdr->driver_status) - hdr->info |= SG_INFO_CHECK; - hdr->resid = req->resid_len; - hdr->sb_len_wr = 0; - - if (req->sense_len && hdr->sbp) { - int len = min((unsigned int) hdr->mx_sb_len, req->sense_len); - - if (!copy_to_user(hdr->sbp, req->sense, len)) - hdr->sb_len_wr = len; - else - ret = -EFAULT; - } - - r = blk_rq_unmap_user(bio); - if (!ret) - ret = r; - - return ret; -} - -static int sg_io(struct request_queue *q, struct gendisk *bd_disk, - struct sg_io_hdr *hdr, fmode_t mode) -{ - unsigned long start_time; - ssize_t ret = 0; - int writing = 0; - int at_head = 0; - struct request *rq; - struct scsi_request *req; - struct bio *bio; - - if (hdr->interface_id != 'S') - return -EINVAL; - - if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9)) - return -EIO; - - if (hdr->dxfer_len) - switch (hdr->dxfer_direction) { - default: - return -EINVAL; - case SG_DXFER_TO_DEV: - writing = 1; - break; - case SG_DXFER_TO_FROM_DEV: - case SG_DXFER_FROM_DEV: - break; - } - if (hdr->flags & SG_FLAG_Q_AT_HEAD) - at_head = 1; - - ret = -ENOMEM; - rq = blk_get_request(q, writing ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); - if (IS_ERR(rq)) - return PTR_ERR(rq); - req = scsi_req(rq); - - if (hdr->cmd_len > BLK_MAX_CDB) { - req->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL); - if (!req->cmd) - goto out_put_request; - } - - ret = blk_fill_sghdr_rq(q, rq, hdr, mode); - if (ret < 0) - goto out_free_cdb; - - ret = 0; - if (hdr->iovec_count) { - struct iov_iter i; - struct iovec *iov = NULL; - - ret = import_iovec(rq_data_dir(rq), hdr->dxferp, - hdr->iovec_count, 0, &iov, &i); - if (ret < 0) - goto out_free_cdb; - - /* SG_IO howto says that the shorter of the two wins */ - iov_iter_truncate(&i, hdr->dxfer_len); - - ret = blk_rq_map_user_iov(q, rq, NULL, &i, GFP_KERNEL); - kfree(iov); - } else if (hdr->dxfer_len) - ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len, - GFP_KERNEL); - - if (ret) - goto out_free_cdb; - - bio = rq->bio; - req->retries = 0; - - start_time = jiffies; - - blk_execute_rq(bd_disk, rq, at_head); - - hdr->duration = jiffies_to_msecs(jiffies - start_time); - - ret = blk_complete_sghdr_rq(rq, hdr, bio); - -out_free_cdb: - scsi_req_free_cmd(req); -out_put_request: - blk_put_request(rq); - return ret; -} - -/** - * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl - * @q: request queue to send scsi commands down - * @disk: gendisk to operate on (option) - * @mode: mode used to open the file through which the ioctl has been - * submitted - * @sic: userspace structure describing the command to perform - * - * Send down the scsi command described by @sic to the device below - * the request queue @q. If @file is non-NULL it's used to perform - * fine-grained permission checks that allow users to send down - * non-destructive SCSI commands. If the caller has a struct gendisk - * available it should be passed in as @disk to allow the low level - * driver to use the information contained in it. A non-NULL @disk - * is only allowed if the caller knows that the low level driver doesn't - * need it (e.g. in the scsi subsystem). - * - * Notes: - * - This interface is deprecated - users should use the SG_IO - * interface instead, as this is a more flexible approach to - * performing SCSI commands on a device. - * - The SCSI command length is determined by examining the 1st byte - * of the given command. There is no way to override this. - * - Data transfers are limited to PAGE_SIZE - * - The length (x + y) must be at least OMAX_SB_LEN bytes long to - * accommodate the sense buffer when an error occurs. - * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that - * old code will not be surprised. - * - If a Unix error occurs (e.g. ENOMEM) then the user will receive - * a negative return and the Unix error code in 'errno'. - * If the SCSI command succeeds then 0 is returned. - * Positive numbers returned are the compacted SCSI error codes (4 - * bytes in one int) where the lowest byte is the SCSI status. - */ -int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode, - struct scsi_ioctl_command __user *sic) -{ - enum { OMAX_SB_LEN = 16 }; /* For backward compatibility */ - struct request *rq; - struct scsi_request *req; - int err; - unsigned int in_len, out_len, bytes, opcode, cmdlen; - char *buffer = NULL; - - if (!sic) - return -EINVAL; - - /* - * get in an out lengths, verify they don't exceed a page worth of data - */ - if (get_user(in_len, &sic->inlen)) - return -EFAULT; - if (get_user(out_len, &sic->outlen)) - return -EFAULT; - if (in_len > PAGE_SIZE || out_len > PAGE_SIZE) - return -EINVAL; - if (get_user(opcode, sic->data)) - return -EFAULT; - - bytes = max(in_len, out_len); - if (bytes) { - buffer = kzalloc(bytes, GFP_NOIO | GFP_USER | __GFP_NOWARN); - if (!buffer) - return -ENOMEM; - - } - - rq = blk_get_request(q, in_len ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); - if (IS_ERR(rq)) { - err = PTR_ERR(rq); - goto error_free_buffer; - } - req = scsi_req(rq); - - cmdlen = COMMAND_SIZE(opcode); - - /* - * get command and data to send to device, if any - */ - err = -EFAULT; - req->cmd_len = cmdlen; - if (copy_from_user(req->cmd, sic->data, cmdlen)) - goto error; - - if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len)) - goto error; - - err = -EPERM; - if (!scsi_cmd_allowed(req->cmd, mode)) - goto error; - - /* default. possible overriden later */ - req->retries = 5; - - switch (opcode) { - case SEND_DIAGNOSTIC: - case FORMAT_UNIT: - rq->timeout = FORMAT_UNIT_TIMEOUT; - req->retries = 1; - break; - case START_STOP: - rq->timeout = START_STOP_TIMEOUT; - break; - case MOVE_MEDIUM: - rq->timeout = MOVE_MEDIUM_TIMEOUT; - break; - case READ_ELEMENT_STATUS: - rq->timeout = READ_ELEMENT_STATUS_TIMEOUT; - break; - case READ_DEFECT_DATA: - rq->timeout = READ_DEFECT_DATA_TIMEOUT; - req->retries = 1; - break; - default: - rq->timeout = BLK_DEFAULT_SG_TIMEOUT; - break; - } - - if (bytes) { - err = blk_rq_map_kern(q, rq, buffer, bytes, GFP_NOIO); - if (err) - goto error; - } - - blk_execute_rq(disk, rq, 0); - - err = req->result & 0xff; /* only 8 bit SCSI status */ - if (err) { - if (req->sense_len && req->sense) { - bytes = (OMAX_SB_LEN > req->sense_len) ? - req->sense_len : OMAX_SB_LEN; - if (copy_to_user(sic->data, req->sense, bytes)) - err = -EFAULT; - } - } else { - if (copy_to_user(sic->data, buffer, out_len)) - err = -EFAULT; - } - -error: - blk_put_request(rq); - -error_free_buffer: - kfree(buffer); - - return err; -} -EXPORT_SYMBOL_GPL(sg_scsi_ioctl); - -/* Send basic block requests */ -static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk, - int cmd, int data) -{ - struct request *rq; - int err; - - rq = blk_get_request(q, REQ_OP_DRV_OUT, 0); - if (IS_ERR(rq)) - return PTR_ERR(rq); - rq->timeout = BLK_DEFAULT_SG_TIMEOUT; - scsi_req(rq)->cmd[0] = cmd; - scsi_req(rq)->cmd[4] = data; - scsi_req(rq)->cmd_len = 6; - blk_execute_rq(bd_disk, rq, 0); - err = scsi_req(rq)->result ? -EIO : 0; - blk_put_request(rq); - - return err; -} - -static inline int blk_send_start_stop(struct request_queue *q, - struct gendisk *bd_disk, int data) -{ - return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data); -} - -int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp) -{ -#ifdef CONFIG_COMPAT - if (in_compat_syscall()) { - struct compat_sg_io_hdr hdr32 = { - .interface_id = hdr->interface_id, - .dxfer_direction = hdr->dxfer_direction, - .cmd_len = hdr->cmd_len, - .mx_sb_len = hdr->mx_sb_len, - .iovec_count = hdr->iovec_count, - .dxfer_len = hdr->dxfer_len, - .dxferp = (uintptr_t)hdr->dxferp, - .cmdp = (uintptr_t)hdr->cmdp, - .sbp = (uintptr_t)hdr->sbp, - .timeout = hdr->timeout, - .flags = hdr->flags, - .pack_id = hdr->pack_id, - .usr_ptr = (uintptr_t)hdr->usr_ptr, - .status = hdr->status, - .masked_status = hdr->masked_status, - .msg_status = hdr->msg_status, - .sb_len_wr = hdr->sb_len_wr, - .host_status = hdr->host_status, - .driver_status = hdr->driver_status, - .resid = hdr->resid, - .duration = hdr->duration, - .info = hdr->info, - }; - - if (copy_to_user(argp, &hdr32, sizeof(hdr32))) - return -EFAULT; - - return 0; - } -#endif - - if (copy_to_user(argp, hdr, sizeof(*hdr))) - return -EFAULT; - - return 0; -} -EXPORT_SYMBOL(put_sg_io_hdr); - -int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp) -{ -#ifdef CONFIG_COMPAT - struct compat_sg_io_hdr hdr32; - - if (in_compat_syscall()) { - if (copy_from_user(&hdr32, argp, sizeof(hdr32))) - return -EFAULT; - - *hdr = (struct sg_io_hdr) { - .interface_id = hdr32.interface_id, - .dxfer_direction = hdr32.dxfer_direction, - .cmd_len = hdr32.cmd_len, - .mx_sb_len = hdr32.mx_sb_len, - .iovec_count = hdr32.iovec_count, - .dxfer_len = hdr32.dxfer_len, - .dxferp = compat_ptr(hdr32.dxferp), - .cmdp = compat_ptr(hdr32.cmdp), - .sbp = compat_ptr(hdr32.sbp), - .timeout = hdr32.timeout, - .flags = hdr32.flags, - .pack_id = hdr32.pack_id, - .usr_ptr = compat_ptr(hdr32.usr_ptr), - .status = hdr32.status, - .masked_status = hdr32.masked_status, - .msg_status = hdr32.msg_status, - .sb_len_wr = hdr32.sb_len_wr, - .host_status = hdr32.host_status, - .driver_status = hdr32.driver_status, - .resid = hdr32.resid, - .duration = hdr32.duration, - .info = hdr32.info, - }; - - return 0; - } -#endif - - if (copy_from_user(hdr, argp, sizeof(*hdr))) - return -EFAULT; - - return 0; -} -EXPORT_SYMBOL(get_sg_io_hdr); - -#ifdef CONFIG_COMPAT -struct compat_cdrom_generic_command { - unsigned char cmd[CDROM_PACKET_SIZE]; - compat_caddr_t buffer; - compat_uint_t buflen; - compat_int_t stat; - compat_caddr_t sense; - unsigned char data_direction; - unsigned char pad[3]; - compat_int_t quiet; - compat_int_t timeout; - compat_caddr_t unused; -}; -#endif - -static int scsi_get_cdrom_generic_arg(struct cdrom_generic_command *cgc, - const void __user *arg) -{ -#ifdef CONFIG_COMPAT - if (in_compat_syscall()) { - struct compat_cdrom_generic_command cgc32; - - if (copy_from_user(&cgc32, arg, sizeof(cgc32))) - return -EFAULT; - - *cgc = (struct cdrom_generic_command) { - .buffer = compat_ptr(cgc32.buffer), - .buflen = cgc32.buflen, - .stat = cgc32.stat, - .sense = compat_ptr(cgc32.sense), - .data_direction = cgc32.data_direction, - .quiet = cgc32.quiet, - .timeout = cgc32.timeout, - .unused = compat_ptr(cgc32.unused), - }; - memcpy(&cgc->cmd, &cgc32.cmd, CDROM_PACKET_SIZE); - return 0; - } -#endif - if (copy_from_user(cgc, arg, sizeof(*cgc))) - return -EFAULT; - - return 0; -} - -static int scsi_put_cdrom_generic_arg(const struct cdrom_generic_command *cgc, - void __user *arg) -{ -#ifdef CONFIG_COMPAT - if (in_compat_syscall()) { - struct compat_cdrom_generic_command cgc32 = { - .buffer = (uintptr_t)(cgc->buffer), - .buflen = cgc->buflen, - .stat = cgc->stat, - .sense = (uintptr_t)(cgc->sense), - .data_direction = cgc->data_direction, - .quiet = cgc->quiet, - .timeout = cgc->timeout, - .unused = (uintptr_t)(cgc->unused), - }; - memcpy(&cgc32.cmd, &cgc->cmd, CDROM_PACKET_SIZE); - - if (copy_to_user(arg, &cgc32, sizeof(cgc32))) - return -EFAULT; - - return 0; - } -#endif - if (copy_to_user(arg, cgc, sizeof(*cgc))) - return -EFAULT; - - return 0; -} - -static int scsi_cdrom_send_packet(struct request_queue *q, - struct gendisk *bd_disk, - fmode_t mode, void __user *arg) -{ - struct cdrom_generic_command cgc; - struct sg_io_hdr hdr; - int err; - - err = scsi_get_cdrom_generic_arg(&cgc, arg); - if (err) - return err; - - cgc.timeout = clock_t_to_jiffies(cgc.timeout); - memset(&hdr, 0, sizeof(hdr)); - hdr.interface_id = 'S'; - hdr.cmd_len = sizeof(cgc.cmd); - hdr.dxfer_len = cgc.buflen; - switch (cgc.data_direction) { - case CGC_DATA_UNKNOWN: - hdr.dxfer_direction = SG_DXFER_UNKNOWN; - break; - case CGC_DATA_WRITE: - hdr.dxfer_direction = SG_DXFER_TO_DEV; - break; - case CGC_DATA_READ: - hdr.dxfer_direction = SG_DXFER_FROM_DEV; - break; - case CGC_DATA_NONE: - hdr.dxfer_direction = SG_DXFER_NONE; - break; - default: - return -EINVAL; - } - - hdr.dxferp = cgc.buffer; - hdr.sbp = cgc.sense; - if (hdr.sbp) - hdr.mx_sb_len = sizeof(struct request_sense); - hdr.timeout = jiffies_to_msecs(cgc.timeout); - hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd; - hdr.cmd_len = sizeof(cgc.cmd); - - err = sg_io(q, bd_disk, &hdr, mode); - if (err == -EFAULT) - return -EFAULT; - - if (hdr.status) - return -EIO; - - cgc.stat = err; - cgc.buflen = hdr.resid; - if (scsi_put_cdrom_generic_arg(&cgc, arg)) - return -EFAULT; - - return err; -} - -int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode, - unsigned int cmd, void __user *arg) -{ - int err; - - if (!q) - return -ENXIO; - - switch (cmd) { - /* - * new sgv3 interface - */ - case SG_GET_VERSION_NUM: - err = sg_get_version(arg); - break; - case SG_SET_TIMEOUT: - err = sg_set_timeout(q, arg); - break; - case SG_GET_TIMEOUT: - err = sg_get_timeout(q); - break; - case SG_GET_RESERVED_SIZE: - err = sg_get_reserved_size(q, arg); - break; - case SG_SET_RESERVED_SIZE: - err = sg_set_reserved_size(q, arg); - break; - case SG_EMULATED_HOST: - err = sg_emulated_host(q, arg); - break; - case SG_IO: { - struct sg_io_hdr hdr; - - err = get_sg_io_hdr(&hdr, arg); - if (err) - break; - err = sg_io(q, bd_disk, &hdr, mode); - if (err == -EFAULT) - break; - - if (put_sg_io_hdr(&hdr, arg)) - err = -EFAULT; - break; - } - case CDROM_SEND_PACKET: - err = scsi_cdrom_send_packet(q, bd_disk, mode, arg); - break; - - /* - * old junk scsi send command ioctl - */ - case SCSI_IOCTL_SEND_COMMAND: - printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm); - err = -EINVAL; - if (!arg) - break; - - err = sg_scsi_ioctl(q, bd_disk, mode, arg); - break; - case CDROMCLOSETRAY: - err = blk_send_start_stop(q, bd_disk, 0x03); - break; - case CDROMEJECT: - err = blk_send_start_stop(q, bd_disk, 0x02); - break; - default: - err = -ENOTTY; - } - - return err; -} -EXPORT_SYMBOL(scsi_cmd_ioctl); diff --git a/drivers/scsi/scsi_ioctl.c b/drivers/scsi/scsi_ioctl.c index 7739575b5229..e2c85b7a54f5 100644 --- a/drivers/scsi/scsi_ioctl.c +++ b/drivers/scsi/scsi_ioctl.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include @@ -189,6 +190,706 @@ static int scsi_ioctl_get_pci(struct scsi_device *sdev, void __user *arg) ? -EFAULT: 0; } +static int sg_get_version(int __user *p) +{ + static const int sg_version_num = 30527; + return put_user(sg_version_num, p); +} + +static int sg_get_timeout(struct request_queue *q) +{ + return jiffies_to_clock_t(q->sg_timeout); +} + +static int sg_set_timeout(struct request_queue *q, int __user *p) +{ + int timeout, err = get_user(timeout, p); + + if (!err) + q->sg_timeout = clock_t_to_jiffies(timeout); + + return err; +} + +static int sg_get_reserved_size(struct request_queue *q, int __user *p) +{ + int val = min(q->sg_reserved_size, queue_max_bytes(q)); + + return put_user(val, p); +} + +static int sg_set_reserved_size(struct request_queue *q, int __user *p) +{ + int size, err = get_user(size, p); + + if (err) + return err; + + if (size < 0) + return -EINVAL; + + q->sg_reserved_size = min_t(unsigned int, size, queue_max_bytes(q)); + return 0; +} + +/* + * will always return that we are ATAPI even for a real SCSI drive, I'm not + * so sure this is worth doing anything about (why would you care??) + */ +static int sg_emulated_host(struct request_queue *q, int __user *p) +{ + return put_user(1, p); +} + +/* Send basic block requests */ +static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk, + int cmd, int data) +{ + struct request *rq; + int err; + + rq = blk_get_request(q, REQ_OP_DRV_OUT, 0); + if (IS_ERR(rq)) + return PTR_ERR(rq); + rq->timeout = BLK_DEFAULT_SG_TIMEOUT; + scsi_req(rq)->cmd[0] = cmd; + scsi_req(rq)->cmd[4] = data; + scsi_req(rq)->cmd_len = 6; + blk_execute_rq(bd_disk, rq, 0); + err = scsi_req(rq)->result ? -EIO : 0; + blk_put_request(rq); + + return err; +} + +static inline int blk_send_start_stop(struct request_queue *q, + struct gendisk *bd_disk, int data) +{ + return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data); +} + +/* + * Check if the given command is allowed. + * + * For unprivileged users only a small set of whitelisted command is allowed so + * that they can't format the drive or update the firmware. + */ +bool scsi_cmd_allowed(unsigned char *cmd, fmode_t mode) +{ + /* root can do any command. */ + if (capable(CAP_SYS_RAWIO)) + return true; + + /* Anybody who can open the device can do a read-safe command */ + switch (cmd[0]) { + /* Basic read-only commands */ + case TEST_UNIT_READY: + case REQUEST_SENSE: + case READ_6: + case READ_10: + case READ_12: + case READ_16: + case READ_BUFFER: + case READ_DEFECT_DATA: + case READ_CAPACITY: /* also GPCMD_READ_CDVD_CAPACITY */ + case READ_LONG: + case INQUIRY: + case MODE_SENSE: + case MODE_SENSE_10: + case LOG_SENSE: + case START_STOP: + case GPCMD_VERIFY_10: + case VERIFY_16: + case REPORT_LUNS: + case SERVICE_ACTION_IN_16: + case RECEIVE_DIAGNOSTIC: + case MAINTENANCE_IN: /* also GPCMD_SEND_KEY, which is a write command */ + case GPCMD_READ_BUFFER_CAPACITY: + /* Audio CD commands */ + case GPCMD_PLAY_CD: + case GPCMD_PLAY_AUDIO_10: + case GPCMD_PLAY_AUDIO_MSF: + case GPCMD_PLAY_AUDIO_TI: + case GPCMD_PAUSE_RESUME: + /* CD/DVD data reading */ + case GPCMD_READ_CD: + case GPCMD_READ_CD_MSF: + case GPCMD_READ_DISC_INFO: + case GPCMD_READ_DVD_STRUCTURE: + case GPCMD_READ_HEADER: + case GPCMD_READ_TRACK_RZONE_INFO: + case GPCMD_READ_SUBCHANNEL: + case GPCMD_READ_TOC_PMA_ATIP: + case GPCMD_REPORT_KEY: + case GPCMD_SCAN: + case GPCMD_GET_CONFIGURATION: + case GPCMD_READ_FORMAT_CAPACITIES: + case GPCMD_GET_EVENT_STATUS_NOTIFICATION: + case GPCMD_GET_PERFORMANCE: + case GPCMD_SEEK: + case GPCMD_STOP_PLAY_SCAN: + /* ZBC */ + case ZBC_IN: + return true; + /* Basic writing commands */ + case WRITE_6: + case WRITE_10: + case WRITE_VERIFY: + case WRITE_12: + case WRITE_VERIFY_12: + case WRITE_16: + case WRITE_LONG: + case WRITE_LONG_2: + case WRITE_SAME: + case WRITE_SAME_16: + case WRITE_SAME_32: + case ERASE: + case GPCMD_MODE_SELECT_10: + case MODE_SELECT: + case LOG_SELECT: + case GPCMD_BLANK: + case GPCMD_CLOSE_TRACK: + case GPCMD_FLUSH_CACHE: + case GPCMD_FORMAT_UNIT: + case GPCMD_REPAIR_RZONE_TRACK: + case GPCMD_RESERVE_RZONE_TRACK: + case GPCMD_SEND_DVD_STRUCTURE: + case GPCMD_SEND_EVENT: + case GPCMD_SEND_OPC: + case GPCMD_SEND_CUE_SHEET: + case GPCMD_SET_SPEED: + case GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL: + case GPCMD_LOAD_UNLOAD: + case GPCMD_SET_STREAMING: + case GPCMD_SET_READ_AHEAD: + /* ZBC */ + case ZBC_OUT: + return (mode & FMODE_WRITE); + default: + return false; + } +} +EXPORT_SYMBOL(scsi_cmd_allowed); + +static int scsi_fill_sghdr_rq(struct request_queue *q, struct request *rq, + struct sg_io_hdr *hdr, fmode_t mode) +{ + struct scsi_request *req = scsi_req(rq); + + if (copy_from_user(req->cmd, hdr->cmdp, hdr->cmd_len)) + return -EFAULT; + if (!scsi_cmd_allowed(req->cmd, mode)) + return -EPERM; + + /* + * fill in request structure + */ + req->cmd_len = hdr->cmd_len; + + rq->timeout = msecs_to_jiffies(hdr->timeout); + if (!rq->timeout) + rq->timeout = q->sg_timeout; + if (!rq->timeout) + rq->timeout = BLK_DEFAULT_SG_TIMEOUT; + if (rq->timeout < BLK_MIN_SG_TIMEOUT) + rq->timeout = BLK_MIN_SG_TIMEOUT; + + return 0; +} + +static int scsi_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr, + struct bio *bio) +{ + struct scsi_request *req = scsi_req(rq); + int r, ret = 0; + + /* + * fill in all the output members + */ + hdr->status = req->result & 0xff; + hdr->masked_status = status_byte(req->result); + hdr->msg_status = COMMAND_COMPLETE; + hdr->host_status = host_byte(req->result); + hdr->driver_status = 0; + if (scsi_status_is_check_condition(hdr->status)) + hdr->driver_status = DRIVER_SENSE; + hdr->info = 0; + if (hdr->masked_status || hdr->host_status || hdr->driver_status) + hdr->info |= SG_INFO_CHECK; + hdr->resid = req->resid_len; + hdr->sb_len_wr = 0; + + if (req->sense_len && hdr->sbp) { + int len = min((unsigned int) hdr->mx_sb_len, req->sense_len); + + if (!copy_to_user(hdr->sbp, req->sense, len)) + hdr->sb_len_wr = len; + else + ret = -EFAULT; + } + + r = blk_rq_unmap_user(bio); + if (!ret) + ret = r; + + return ret; +} + +static int sg_io(struct request_queue *q, struct gendisk *bd_disk, + struct sg_io_hdr *hdr, fmode_t mode) +{ + unsigned long start_time; + ssize_t ret = 0; + int writing = 0; + int at_head = 0; + struct request *rq; + struct scsi_request *req; + struct bio *bio; + + if (hdr->interface_id != 'S') + return -EINVAL; + + if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9)) + return -EIO; + + if (hdr->dxfer_len) + switch (hdr->dxfer_direction) { + default: + return -EINVAL; + case SG_DXFER_TO_DEV: + writing = 1; + break; + case SG_DXFER_TO_FROM_DEV: + case SG_DXFER_FROM_DEV: + break; + } + if (hdr->flags & SG_FLAG_Q_AT_HEAD) + at_head = 1; + + ret = -ENOMEM; + rq = blk_get_request(q, writing ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); + if (IS_ERR(rq)) + return PTR_ERR(rq); + req = scsi_req(rq); + + if (hdr->cmd_len > BLK_MAX_CDB) { + req->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL); + if (!req->cmd) + goto out_put_request; + } + + ret = scsi_fill_sghdr_rq(q, rq, hdr, mode); + if (ret < 0) + goto out_free_cdb; + + ret = 0; + if (hdr->iovec_count) { + struct iov_iter i; + struct iovec *iov = NULL; + + ret = import_iovec(rq_data_dir(rq), hdr->dxferp, + hdr->iovec_count, 0, &iov, &i); + if (ret < 0) + goto out_free_cdb; + + /* SG_IO howto says that the shorter of the two wins */ + iov_iter_truncate(&i, hdr->dxfer_len); + + ret = blk_rq_map_user_iov(q, rq, NULL, &i, GFP_KERNEL); + kfree(iov); + } else if (hdr->dxfer_len) + ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len, + GFP_KERNEL); + + if (ret) + goto out_free_cdb; + + bio = rq->bio; + req->retries = 0; + + start_time = jiffies; + + blk_execute_rq(bd_disk, rq, at_head); + + hdr->duration = jiffies_to_msecs(jiffies - start_time); + + ret = scsi_complete_sghdr_rq(rq, hdr, bio); + +out_free_cdb: + scsi_req_free_cmd(req); +out_put_request: + blk_put_request(rq); + return ret; +} + +/** + * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl + * @q: request queue to send scsi commands down + * @disk: gendisk to operate on (option) + * @mode: mode used to open the file through which the ioctl has been + * submitted + * @sic: userspace structure describing the command to perform + * + * Send down the scsi command described by @sic to the device below + * the request queue @q. If @file is non-NULL it's used to perform + * fine-grained permission checks that allow users to send down + * non-destructive SCSI commands. If the caller has a struct gendisk + * available it should be passed in as @disk to allow the low level + * driver to use the information contained in it. A non-NULL @disk + * is only allowed if the caller knows that the low level driver doesn't + * need it (e.g. in the scsi subsystem). + * + * Notes: + * - This interface is deprecated - users should use the SG_IO + * interface instead, as this is a more flexible approach to + * performing SCSI commands on a device. + * - The SCSI command length is determined by examining the 1st byte + * of the given command. There is no way to override this. + * - Data transfers are limited to PAGE_SIZE + * - The length (x + y) must be at least OMAX_SB_LEN bytes long to + * accommodate the sense buffer when an error occurs. + * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that + * old code will not be surprised. + * - If a Unix error occurs (e.g. ENOMEM) then the user will receive + * a negative return and the Unix error code in 'errno'. + * If the SCSI command succeeds then 0 is returned. + * Positive numbers returned are the compacted SCSI error codes (4 + * bytes in one int) where the lowest byte is the SCSI status. + */ +int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode, + struct scsi_ioctl_command __user *sic) +{ + enum { OMAX_SB_LEN = 16 }; /* For backward compatibility */ + struct request *rq; + struct scsi_request *req; + int err; + unsigned int in_len, out_len, bytes, opcode, cmdlen; + char *buffer = NULL; + + if (!sic) + return -EINVAL; + + /* + * get in an out lengths, verify they don't exceed a page worth of data + */ + if (get_user(in_len, &sic->inlen)) + return -EFAULT; + if (get_user(out_len, &sic->outlen)) + return -EFAULT; + if (in_len > PAGE_SIZE || out_len > PAGE_SIZE) + return -EINVAL; + if (get_user(opcode, sic->data)) + return -EFAULT; + + bytes = max(in_len, out_len); + if (bytes) { + buffer = kzalloc(bytes, GFP_NOIO | GFP_USER | __GFP_NOWARN); + if (!buffer) + return -ENOMEM; + + } + + rq = blk_get_request(q, in_len ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); + if (IS_ERR(rq)) { + err = PTR_ERR(rq); + goto error_free_buffer; + } + req = scsi_req(rq); + + cmdlen = COMMAND_SIZE(opcode); + + /* + * get command and data to send to device, if any + */ + err = -EFAULT; + req->cmd_len = cmdlen; + if (copy_from_user(req->cmd, sic->data, cmdlen)) + goto error; + + if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len)) + goto error; + + err = -EPERM; + if (!scsi_cmd_allowed(req->cmd, mode)) + goto error; + + /* default. possible overriden later */ + req->retries = 5; + + switch (opcode) { + case SEND_DIAGNOSTIC: + case FORMAT_UNIT: + rq->timeout = FORMAT_UNIT_TIMEOUT; + req->retries = 1; + break; + case START_STOP: + rq->timeout = START_STOP_TIMEOUT; + break; + case MOVE_MEDIUM: + rq->timeout = MOVE_MEDIUM_TIMEOUT; + break; + case READ_ELEMENT_STATUS: + rq->timeout = READ_ELEMENT_STATUS_TIMEOUT; + break; + case READ_DEFECT_DATA: + rq->timeout = READ_DEFECT_DATA_TIMEOUT; + req->retries = 1; + break; + default: + rq->timeout = BLK_DEFAULT_SG_TIMEOUT; + break; + } + + if (bytes) { + err = blk_rq_map_kern(q, rq, buffer, bytes, GFP_NOIO); + if (err) + goto error; + } + + blk_execute_rq(disk, rq, 0); + + err = req->result & 0xff; /* only 8 bit SCSI status */ + if (err) { + if (req->sense_len && req->sense) { + bytes = (OMAX_SB_LEN > req->sense_len) ? + req->sense_len : OMAX_SB_LEN; + if (copy_to_user(sic->data, req->sense, bytes)) + err = -EFAULT; + } + } else { + if (copy_to_user(sic->data, buffer, out_len)) + err = -EFAULT; + } + +error: + blk_put_request(rq); + +error_free_buffer: + kfree(buffer); + + return err; +} +EXPORT_SYMBOL_GPL(sg_scsi_ioctl); + +int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp) +{ +#ifdef CONFIG_COMPAT + if (in_compat_syscall()) { + struct compat_sg_io_hdr hdr32 = { + .interface_id = hdr->interface_id, + .dxfer_direction = hdr->dxfer_direction, + .cmd_len = hdr->cmd_len, + .mx_sb_len = hdr->mx_sb_len, + .iovec_count = hdr->iovec_count, + .dxfer_len = hdr->dxfer_len, + .dxferp = (uintptr_t)hdr->dxferp, + .cmdp = (uintptr_t)hdr->cmdp, + .sbp = (uintptr_t)hdr->sbp, + .timeout = hdr->timeout, + .flags = hdr->flags, + .pack_id = hdr->pack_id, + .usr_ptr = (uintptr_t)hdr->usr_ptr, + .status = hdr->status, + .masked_status = hdr->masked_status, + .msg_status = hdr->msg_status, + .sb_len_wr = hdr->sb_len_wr, + .host_status = hdr->host_status, + .driver_status = hdr->driver_status, + .resid = hdr->resid, + .duration = hdr->duration, + .info = hdr->info, + }; + + if (copy_to_user(argp, &hdr32, sizeof(hdr32))) + return -EFAULT; + + return 0; + } +#endif + + if (copy_to_user(argp, hdr, sizeof(*hdr))) + return -EFAULT; + + return 0; +} +EXPORT_SYMBOL(put_sg_io_hdr); + +int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp) +{ +#ifdef CONFIG_COMPAT + struct compat_sg_io_hdr hdr32; + + if (in_compat_syscall()) { + if (copy_from_user(&hdr32, argp, sizeof(hdr32))) + return -EFAULT; + + *hdr = (struct sg_io_hdr) { + .interface_id = hdr32.interface_id, + .dxfer_direction = hdr32.dxfer_direction, + .cmd_len = hdr32.cmd_len, + .mx_sb_len = hdr32.mx_sb_len, + .iovec_count = hdr32.iovec_count, + .dxfer_len = hdr32.dxfer_len, + .dxferp = compat_ptr(hdr32.dxferp), + .cmdp = compat_ptr(hdr32.cmdp), + .sbp = compat_ptr(hdr32.sbp), + .timeout = hdr32.timeout, + .flags = hdr32.flags, + .pack_id = hdr32.pack_id, + .usr_ptr = compat_ptr(hdr32.usr_ptr), + .status = hdr32.status, + .masked_status = hdr32.masked_status, + .msg_status = hdr32.msg_status, + .sb_len_wr = hdr32.sb_len_wr, + .host_status = hdr32.host_status, + .driver_status = hdr32.driver_status, + .resid = hdr32.resid, + .duration = hdr32.duration, + .info = hdr32.info, + }; + + return 0; + } +#endif + + if (copy_from_user(hdr, argp, sizeof(*hdr))) + return -EFAULT; + + return 0; +} +EXPORT_SYMBOL(get_sg_io_hdr); + +#ifdef CONFIG_COMPAT +struct compat_cdrom_generic_command { + unsigned char cmd[CDROM_PACKET_SIZE]; + compat_caddr_t buffer; + compat_uint_t buflen; + compat_int_t stat; + compat_caddr_t sense; + unsigned char data_direction; + unsigned char pad[3]; + compat_int_t quiet; + compat_int_t timeout; + compat_caddr_t unused; +}; +#endif + +static int scsi_get_cdrom_generic_arg(struct cdrom_generic_command *cgc, + const void __user *arg) +{ +#ifdef CONFIG_COMPAT + if (in_compat_syscall()) { + struct compat_cdrom_generic_command cgc32; + + if (copy_from_user(&cgc32, arg, sizeof(cgc32))) + return -EFAULT; + + *cgc = (struct cdrom_generic_command) { + .buffer = compat_ptr(cgc32.buffer), + .buflen = cgc32.buflen, + .stat = cgc32.stat, + .sense = compat_ptr(cgc32.sense), + .data_direction = cgc32.data_direction, + .quiet = cgc32.quiet, + .timeout = cgc32.timeout, + .unused = compat_ptr(cgc32.unused), + }; + memcpy(&cgc->cmd, &cgc32.cmd, CDROM_PACKET_SIZE); + return 0; + } +#endif + if (copy_from_user(cgc, arg, sizeof(*cgc))) + return -EFAULT; + + return 0; +} + +static int scsi_put_cdrom_generic_arg(const struct cdrom_generic_command *cgc, + void __user *arg) +{ +#ifdef CONFIG_COMPAT + if (in_compat_syscall()) { + struct compat_cdrom_generic_command cgc32 = { + .buffer = (uintptr_t)(cgc->buffer), + .buflen = cgc->buflen, + .stat = cgc->stat, + .sense = (uintptr_t)(cgc->sense), + .data_direction = cgc->data_direction, + .quiet = cgc->quiet, + .timeout = cgc->timeout, + .unused = (uintptr_t)(cgc->unused), + }; + memcpy(&cgc32.cmd, &cgc->cmd, CDROM_PACKET_SIZE); + + if (copy_to_user(arg, &cgc32, sizeof(cgc32))) + return -EFAULT; + + return 0; + } +#endif + if (copy_to_user(arg, cgc, sizeof(*cgc))) + return -EFAULT; + + return 0; +} + +static int scsi_cdrom_send_packet(struct request_queue *q, + struct gendisk *bd_disk, + fmode_t mode, void __user *arg) +{ + struct cdrom_generic_command cgc; + struct sg_io_hdr hdr; + int err; + + err = scsi_get_cdrom_generic_arg(&cgc, arg); + if (err) + return err; + + cgc.timeout = clock_t_to_jiffies(cgc.timeout); + memset(&hdr, 0, sizeof(hdr)); + hdr.interface_id = 'S'; + hdr.cmd_len = sizeof(cgc.cmd); + hdr.dxfer_len = cgc.buflen; + switch (cgc.data_direction) { + case CGC_DATA_UNKNOWN: + hdr.dxfer_direction = SG_DXFER_UNKNOWN; + break; + case CGC_DATA_WRITE: + hdr.dxfer_direction = SG_DXFER_TO_DEV; + break; + case CGC_DATA_READ: + hdr.dxfer_direction = SG_DXFER_FROM_DEV; + break; + case CGC_DATA_NONE: + hdr.dxfer_direction = SG_DXFER_NONE; + break; + default: + return -EINVAL; + } + + hdr.dxferp = cgc.buffer; + hdr.sbp = cgc.sense; + if (hdr.sbp) + hdr.mx_sb_len = sizeof(struct request_sense); + hdr.timeout = jiffies_to_msecs(cgc.timeout); + hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd; + hdr.cmd_len = sizeof(cgc.cmd); + + err = sg_io(q, bd_disk, &hdr, mode); + if (err == -EFAULT) + return -EFAULT; + + if (hdr.status) + return -EIO; + + cgc.stat = err; + cgc.buflen = hdr.resid; + if (scsi_put_cdrom_generic_arg(&cgc, arg)) + return -EFAULT; + + return err; +} + /** * scsi_ioctl - Dispatch ioctl to scsi device * @sdev: scsi device receiving ioctl @@ -225,13 +926,42 @@ int scsi_ioctl(struct scsi_device *sdev, struct gendisk *disk, fmode_t mode, break; } - if (cmd != SCSI_IOCTL_GET_IDLUN && cmd != SCSI_IOCTL_GET_BUS_NUMBER) { - error = scsi_cmd_ioctl(q, disk, mode, cmd, arg); - if (error != -ENOTTY) + switch (cmd) { + case SG_GET_VERSION_NUM: + return sg_get_version(arg); + case SG_SET_TIMEOUT: + return sg_set_timeout(q, arg); + case SG_GET_TIMEOUT: + return sg_get_timeout(q); + case SG_GET_RESERVED_SIZE: + return sg_get_reserved_size(q, arg); + case SG_SET_RESERVED_SIZE: + return sg_set_reserved_size(q, arg); + case SG_EMULATED_HOST: + return sg_emulated_host(q, arg); + case SG_IO: { + struct sg_io_hdr hdr; + + error = get_sg_io_hdr(&hdr, arg); + if (error) return error; - } - switch (cmd) { + error = sg_io(q, disk, &hdr, mode); + if (error == -EFAULT) + return error; + + if (put_sg_io_hdr(&hdr, arg)) + return -EFAULT; + return 0; + } + case SCSI_IOCTL_SEND_COMMAND: + return sg_scsi_ioctl(q, disk, mode, arg); + case CDROM_SEND_PACKET: + return scsi_cdrom_send_packet(q, disk, mode, arg); + case CDROMCLOSETRAY: + return blk_send_start_stop(q, disk, 0x03); + case CDROMEJECT: + return blk_send_start_stop(q, disk, 0x02); case SCSI_IOCTL_GET_IDLUN: { struct scsi_idlun v = { .dev_id = (sdev->id & 0xff) diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index e28679e63373..8c617a5a5d61 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -28,8 +28,6 @@ #include struct module; -struct scsi_ioctl_command; - struct request_queue; struct elevator_queue; struct blk_trace; @@ -888,13 +886,6 @@ extern blk_status_t blk_insert_cloned_request(struct request_queue *q, struct request *rq); int blk_rq_append_bio(struct request *rq, struct bio *bio); extern void blk_queue_split(struct bio **); -extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, - unsigned int, void __user *); -extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, - struct scsi_ioctl_command __user *); -extern int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp); -extern int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp); - extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags); extern void blk_queue_exit(struct request_queue *q); extern void blk_sync_queue(struct request_queue *q); @@ -1343,8 +1334,6 @@ static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, gfp_mask, 0); } -bool scsi_cmd_allowed(unsigned char *cmd, fmode_t mode); - static inline bool bdev_is_partition(struct block_device *bdev) { return bdev->bd_partno; diff --git a/include/scsi/scsi_ioctl.h b/include/scsi/scsi_ioctl.h index defbe8084eb8..b3918fded464 100644 --- a/include/scsi/scsi_ioctl.h +++ b/include/scsi/scsi_ioctl.h @@ -20,6 +20,7 @@ struct gendisk; struct scsi_device; +struct sg_io_hdr; /* * Structures used for scsi_ioctl et al. @@ -46,6 +47,11 @@ int scsi_ioctl_block_when_processing_errors(struct scsi_device *sdev, int cmd, bool ndelay); int scsi_ioctl(struct scsi_device *sdev, struct gendisk *disk, fmode_t mode, int cmd, void __user *arg); +int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode, + struct scsi_ioctl_command __user *argp); +int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp); +int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp); +bool scsi_cmd_allowed(unsigned char *cmd, fmode_t mode); #endif /* __KERNEL__ */ #endif /* _SCSI_IOCTL_H */