// SPDX-License-Identifier: GPL-2.0+
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/*
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* comedi/comedi_compat32.c
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* 32-bit ioctl compatibility for 64-bit comedi kernel module.
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*
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* Author: Ian Abbott, MEV Ltd. <abbotti@mev.co.uk>
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* Copyright (C) 2007 MEV Ltd. <http://www.mev.co.uk/>
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*
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* COMEDI - Linux Control and Measurement Device Interface
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* Copyright (C) 1997-2007 David A. Schleef <ds@schleef.org>
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*/
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#include <linux/uaccess.h>
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#include <linux/compat.h>
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#include <linux/fs.h>
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#include "comedi.h"
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#include "comedi_compat32.h"
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#define COMEDI32_CHANINFO _IOR(CIO, 3, struct comedi32_chaninfo_struct)
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#define COMEDI32_RANGEINFO _IOR(CIO, 8, struct comedi32_rangeinfo_struct)
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/*
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* N.B. COMEDI32_CMD and COMEDI_CMD ought to use _IOWR, not _IOR.
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* It's too late to change it now, but it only affects the command number.
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*/
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#define COMEDI32_CMD _IOR(CIO, 9, struct comedi32_cmd_struct)
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/*
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* N.B. COMEDI32_CMDTEST and COMEDI_CMDTEST ought to use _IOWR, not _IOR.
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* It's too late to change it now, but it only affects the command number.
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*/
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#define COMEDI32_CMDTEST _IOR(CIO, 10, struct comedi32_cmd_struct)
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#define COMEDI32_INSNLIST _IOR(CIO, 11, struct comedi32_insnlist_struct)
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#define COMEDI32_INSN _IOR(CIO, 12, struct comedi32_insn_struct)
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struct comedi32_chaninfo_struct {
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unsigned int subdev;
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compat_uptr_t maxdata_list; /* 32-bit 'unsigned int *' */
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compat_uptr_t flaglist; /* 32-bit 'unsigned int *' */
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compat_uptr_t rangelist; /* 32-bit 'unsigned int *' */
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unsigned int unused[4];
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};
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struct comedi32_rangeinfo_struct {
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unsigned int range_type;
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compat_uptr_t range_ptr; /* 32-bit 'void *' */
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};
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struct comedi32_cmd_struct {
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unsigned int subdev;
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unsigned int flags;
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unsigned int start_src;
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unsigned int start_arg;
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unsigned int scan_begin_src;
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unsigned int scan_begin_arg;
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unsigned int convert_src;
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unsigned int convert_arg;
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unsigned int scan_end_src;
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unsigned int scan_end_arg;
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unsigned int stop_src;
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unsigned int stop_arg;
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compat_uptr_t chanlist; /* 32-bit 'unsigned int *' */
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unsigned int chanlist_len;
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compat_uptr_t data; /* 32-bit 'short *' */
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unsigned int data_len;
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};
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struct comedi32_insn_struct {
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unsigned int insn;
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unsigned int n;
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compat_uptr_t data; /* 32-bit 'unsigned int *' */
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unsigned int subdev;
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unsigned int chanspec;
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unsigned int unused[3];
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};
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struct comedi32_insnlist_struct {
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unsigned int n_insns;
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compat_uptr_t insns; /* 32-bit 'struct comedi_insn *' */
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};
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/* Handle translated ioctl. */
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static int translated_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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if (file->f_op->unlocked_ioctl)
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return file->f_op->unlocked_ioctl(file, cmd, arg);
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return -ENOTTY;
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}
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/* Handle 32-bit COMEDI_CHANINFO ioctl. */
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static int compat_chaninfo(struct file *file, unsigned long arg)
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{
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struct comedi_chaninfo __user *chaninfo;
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struct comedi32_chaninfo_struct __user *chaninfo32;
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int err;
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union {
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unsigned int uint;
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compat_uptr_t uptr;
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} temp;
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chaninfo32 = compat_ptr(arg);
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chaninfo = compat_alloc_user_space(sizeof(*chaninfo));
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/* Copy chaninfo structure. Ignore unused members. */
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if (!access_ok(VERIFY_READ, chaninfo32, sizeof(*chaninfo32)) ||
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!access_ok(VERIFY_WRITE, chaninfo, sizeof(*chaninfo)))
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return -EFAULT;
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err = 0;
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err |= __get_user(temp.uint, &chaninfo32->subdev);
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err |= __put_user(temp.uint, &chaninfo->subdev);
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err |= __get_user(temp.uptr, &chaninfo32->maxdata_list);
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err |= __put_user(compat_ptr(temp.uptr), &chaninfo->maxdata_list);
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err |= __get_user(temp.uptr, &chaninfo32->flaglist);
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err |= __put_user(compat_ptr(temp.uptr), &chaninfo->flaglist);
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err |= __get_user(temp.uptr, &chaninfo32->rangelist);
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err |= __put_user(compat_ptr(temp.uptr), &chaninfo->rangelist);
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if (err)
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return -EFAULT;
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return translated_ioctl(file, COMEDI_CHANINFO, (unsigned long)chaninfo);
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}
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/* Handle 32-bit COMEDI_RANGEINFO ioctl. */
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static int compat_rangeinfo(struct file *file, unsigned long arg)
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{
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struct comedi_rangeinfo __user *rangeinfo;
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struct comedi32_rangeinfo_struct __user *rangeinfo32;
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int err;
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union {
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unsigned int uint;
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compat_uptr_t uptr;
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} temp;
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rangeinfo32 = compat_ptr(arg);
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rangeinfo = compat_alloc_user_space(sizeof(*rangeinfo));
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/* Copy rangeinfo structure. */
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if (!access_ok(VERIFY_READ, rangeinfo32, sizeof(*rangeinfo32)) ||
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!access_ok(VERIFY_WRITE, rangeinfo, sizeof(*rangeinfo)))
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return -EFAULT;
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err = 0;
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err |= __get_user(temp.uint, &rangeinfo32->range_type);
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err |= __put_user(temp.uint, &rangeinfo->range_type);
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err |= __get_user(temp.uptr, &rangeinfo32->range_ptr);
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err |= __put_user(compat_ptr(temp.uptr), &rangeinfo->range_ptr);
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if (err)
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return -EFAULT;
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return translated_ioctl(file, COMEDI_RANGEINFO,
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(unsigned long)rangeinfo);
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}
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/* Copy 32-bit cmd structure to native cmd structure. */
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static int get_compat_cmd(struct comedi_cmd __user *cmd,
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struct comedi32_cmd_struct __user *cmd32)
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{
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int err;
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union {
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unsigned int uint;
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compat_uptr_t uptr;
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} temp;
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/* Copy cmd structure. */
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if (!access_ok(VERIFY_READ, cmd32, sizeof(*cmd32)) ||
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!access_ok(VERIFY_WRITE, cmd, sizeof(*cmd)))
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return -EFAULT;
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err = 0;
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err |= __get_user(temp.uint, &cmd32->subdev);
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err |= __put_user(temp.uint, &cmd->subdev);
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err |= __get_user(temp.uint, &cmd32->flags);
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err |= __put_user(temp.uint, &cmd->flags);
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err |= __get_user(temp.uint, &cmd32->start_src);
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err |= __put_user(temp.uint, &cmd->start_src);
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err |= __get_user(temp.uint, &cmd32->start_arg);
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err |= __put_user(temp.uint, &cmd->start_arg);
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err |= __get_user(temp.uint, &cmd32->scan_begin_src);
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err |= __put_user(temp.uint, &cmd->scan_begin_src);
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err |= __get_user(temp.uint, &cmd32->scan_begin_arg);
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err |= __put_user(temp.uint, &cmd->scan_begin_arg);
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err |= __get_user(temp.uint, &cmd32->convert_src);
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err |= __put_user(temp.uint, &cmd->convert_src);
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err |= __get_user(temp.uint, &cmd32->convert_arg);
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err |= __put_user(temp.uint, &cmd->convert_arg);
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err |= __get_user(temp.uint, &cmd32->scan_end_src);
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err |= __put_user(temp.uint, &cmd->scan_end_src);
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err |= __get_user(temp.uint, &cmd32->scan_end_arg);
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err |= __put_user(temp.uint, &cmd->scan_end_arg);
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err |= __get_user(temp.uint, &cmd32->stop_src);
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err |= __put_user(temp.uint, &cmd->stop_src);
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err |= __get_user(temp.uint, &cmd32->stop_arg);
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err |= __put_user(temp.uint, &cmd->stop_arg);
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err |= __get_user(temp.uptr, &cmd32->chanlist);
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err |= __put_user((unsigned int __force *)compat_ptr(temp.uptr),
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&cmd->chanlist);
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err |= __get_user(temp.uint, &cmd32->chanlist_len);
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err |= __put_user(temp.uint, &cmd->chanlist_len);
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err |= __get_user(temp.uptr, &cmd32->data);
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err |= __put_user(compat_ptr(temp.uptr), &cmd->data);
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err |= __get_user(temp.uint, &cmd32->data_len);
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err |= __put_user(temp.uint, &cmd->data_len);
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return err ? -EFAULT : 0;
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}
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/* Copy native cmd structure to 32-bit cmd structure. */
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static int put_compat_cmd(struct comedi32_cmd_struct __user *cmd32,
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struct comedi_cmd __user *cmd)
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{
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int err;
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unsigned int temp;
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/*
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* Copy back most of cmd structure.
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*
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* Assume the pointer values are already valid.
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* (Could use ptr_to_compat() to set them.)
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*/
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if (!access_ok(VERIFY_READ, cmd, sizeof(*cmd)) ||
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!access_ok(VERIFY_WRITE, cmd32, sizeof(*cmd32)))
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return -EFAULT;
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err = 0;
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err |= __get_user(temp, &cmd->subdev);
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err |= __put_user(temp, &cmd32->subdev);
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err |= __get_user(temp, &cmd->flags);
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err |= __put_user(temp, &cmd32->flags);
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err |= __get_user(temp, &cmd->start_src);
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err |= __put_user(temp, &cmd32->start_src);
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err |= __get_user(temp, &cmd->start_arg);
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err |= __put_user(temp, &cmd32->start_arg);
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err |= __get_user(temp, &cmd->scan_begin_src);
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err |= __put_user(temp, &cmd32->scan_begin_src);
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err |= __get_user(temp, &cmd->scan_begin_arg);
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err |= __put_user(temp, &cmd32->scan_begin_arg);
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err |= __get_user(temp, &cmd->convert_src);
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err |= __put_user(temp, &cmd32->convert_src);
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err |= __get_user(temp, &cmd->convert_arg);
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err |= __put_user(temp, &cmd32->convert_arg);
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err |= __get_user(temp, &cmd->scan_end_src);
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err |= __put_user(temp, &cmd32->scan_end_src);
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err |= __get_user(temp, &cmd->scan_end_arg);
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err |= __put_user(temp, &cmd32->scan_end_arg);
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err |= __get_user(temp, &cmd->stop_src);
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err |= __put_user(temp, &cmd32->stop_src);
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err |= __get_user(temp, &cmd->stop_arg);
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err |= __put_user(temp, &cmd32->stop_arg);
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/* Assume chanlist pointer is unchanged. */
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err |= __get_user(temp, &cmd->chanlist_len);
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err |= __put_user(temp, &cmd32->chanlist_len);
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/* Assume data pointer is unchanged. */
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err |= __get_user(temp, &cmd->data_len);
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err |= __put_user(temp, &cmd32->data_len);
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return err ? -EFAULT : 0;
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}
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/* Handle 32-bit COMEDI_CMD ioctl. */
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static int compat_cmd(struct file *file, unsigned long arg)
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{
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struct comedi_cmd __user *cmd;
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struct comedi32_cmd_struct __user *cmd32;
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int rc, err;
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cmd32 = compat_ptr(arg);
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cmd = compat_alloc_user_space(sizeof(*cmd));
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rc = get_compat_cmd(cmd, cmd32);
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if (rc)
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return rc;
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rc = translated_ioctl(file, COMEDI_CMD, (unsigned long)cmd);
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if (rc == -EAGAIN) {
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/* Special case: copy cmd back to user. */
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err = put_compat_cmd(cmd32, cmd);
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if (err)
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rc = err;
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}
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return rc;
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}
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/* Handle 32-bit COMEDI_CMDTEST ioctl. */
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static int compat_cmdtest(struct file *file, unsigned long arg)
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{
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struct comedi_cmd __user *cmd;
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struct comedi32_cmd_struct __user *cmd32;
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int rc, err;
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cmd32 = compat_ptr(arg);
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cmd = compat_alloc_user_space(sizeof(*cmd));
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rc = get_compat_cmd(cmd, cmd32);
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if (rc)
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return rc;
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rc = translated_ioctl(file, COMEDI_CMDTEST, (unsigned long)cmd);
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if (rc < 0)
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return rc;
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err = put_compat_cmd(cmd32, cmd);
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if (err)
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rc = err;
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return rc;
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}
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/* Copy 32-bit insn structure to native insn structure. */
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static int get_compat_insn(struct comedi_insn __user *insn,
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struct comedi32_insn_struct __user *insn32)
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{
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int err;
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union {
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unsigned int uint;
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compat_uptr_t uptr;
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} temp;
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/* Copy insn structure. Ignore the unused members. */
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err = 0;
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if (!access_ok(VERIFY_READ, insn32, sizeof(*insn32)) ||
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!access_ok(VERIFY_WRITE, insn, sizeof(*insn)))
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return -EFAULT;
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err |= __get_user(temp.uint, &insn32->insn);
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err |= __put_user(temp.uint, &insn->insn);
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err |= __get_user(temp.uint, &insn32->n);
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err |= __put_user(temp.uint, &insn->n);
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err |= __get_user(temp.uptr, &insn32->data);
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err |= __put_user(compat_ptr(temp.uptr), &insn->data);
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err |= __get_user(temp.uint, &insn32->subdev);
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err |= __put_user(temp.uint, &insn->subdev);
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err |= __get_user(temp.uint, &insn32->chanspec);
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err |= __put_user(temp.uint, &insn->chanspec);
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return err ? -EFAULT : 0;
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}
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/* Handle 32-bit COMEDI_INSNLIST ioctl. */
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static int compat_insnlist(struct file *file, unsigned long arg)
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{
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struct combined_insnlist {
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struct comedi_insnlist insnlist;
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struct comedi_insn insn[1];
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} __user *s;
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struct comedi32_insnlist_struct __user *insnlist32;
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struct comedi32_insn_struct __user *insn32;
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compat_uptr_t uptr;
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unsigned int n_insns, n;
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int err, rc;
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insnlist32 = compat_ptr(arg);
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/* Get 32-bit insnlist structure. */
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if (!access_ok(VERIFY_READ, insnlist32, sizeof(*insnlist32)))
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return -EFAULT;
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err = 0;
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err |= __get_user(n_insns, &insnlist32->n_insns);
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err |= __get_user(uptr, &insnlist32->insns);
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insn32 = compat_ptr(uptr);
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if (err)
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return -EFAULT;
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/* Allocate user memory to copy insnlist and insns into. */
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s = compat_alloc_user_space(offsetof(struct combined_insnlist,
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insn[n_insns]));
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/* Set native insnlist structure. */
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if (!access_ok(VERIFY_WRITE, &s->insnlist, sizeof(s->insnlist)))
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return -EFAULT;
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err |= __put_user(n_insns, &s->insnlist.n_insns);
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err |= __put_user(&s->insn[0], &s->insnlist.insns);
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if (err)
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return -EFAULT;
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/* Copy insn structures. */
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for (n = 0; n < n_insns; n++) {
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rc = get_compat_insn(&s->insn[n], &insn32[n]);
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if (rc)
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return rc;
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}
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return translated_ioctl(file, COMEDI_INSNLIST,
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(unsigned long)&s->insnlist);
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}
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/* Handle 32-bit COMEDI_INSN ioctl. */
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static int compat_insn(struct file *file, unsigned long arg)
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{
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struct comedi_insn __user *insn;
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struct comedi32_insn_struct __user *insn32;
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int rc;
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insn32 = compat_ptr(arg);
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insn = compat_alloc_user_space(sizeof(*insn));
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rc = get_compat_insn(insn, insn32);
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if (rc)
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return rc;
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return translated_ioctl(file, COMEDI_INSN, (unsigned long)insn);
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}
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/*
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* compat_ioctl file operation.
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*
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* Returns -ENOIOCTLCMD for unrecognised ioctl codes.
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*/
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long comedi_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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int rc;
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switch (cmd) {
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case COMEDI_DEVCONFIG:
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case COMEDI_DEVINFO:
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case COMEDI_SUBDINFO:
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case COMEDI_BUFCONFIG:
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case COMEDI_BUFINFO:
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/* Just need to translate the pointer argument. */
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arg = (unsigned long)compat_ptr(arg);
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rc = translated_ioctl(file, cmd, arg);
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break;
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case COMEDI_LOCK:
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case COMEDI_UNLOCK:
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case COMEDI_CANCEL:
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case COMEDI_POLL:
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case COMEDI_SETRSUBD:
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case COMEDI_SETWSUBD:
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/* No translation needed. */
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rc = translated_ioctl(file, cmd, arg);
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break;
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case COMEDI32_CHANINFO:
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rc = compat_chaninfo(file, arg);
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break;
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case COMEDI32_RANGEINFO:
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rc = compat_rangeinfo(file, arg);
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break;
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case COMEDI32_CMD:
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rc = compat_cmd(file, arg);
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break;
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case COMEDI32_CMDTEST:
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rc = compat_cmdtest(file, arg);
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break;
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case COMEDI32_INSNLIST:
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rc = compat_insnlist(file, arg);
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break;
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case COMEDI32_INSN:
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rc = compat_insn(file, arg);
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break;
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default:
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rc = -ENOIOCTLCMD;
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break;
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}
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return rc;
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}
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