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// SPDX-License-Identifier: GPL-2.0+
/*
* comedi/comedi_compat32.c
* 32-bit ioctl compatibility for 64-bit comedi kernel module.
*
* Author: Ian Abbott, MEV Ltd. <abbotti@mev.co.uk>
* Copyright (C) 2007 MEV Ltd. <http://www.mev.co.uk/>
*
* COMEDI - Linux Control and Measurement Device Interface
* Copyright (C) 1997-2007 David A. Schleef <ds@schleef.org>
*/
#include <linux/uaccess.h>
#include <linux/compat.h>
#include <linux/fs.h>
#include "comedi.h"
#include "comedi_compat32.h"
#define COMEDI32_CHANINFO _IOR(CIO, 3, struct comedi32_chaninfo_struct)
#define COMEDI32_RANGEINFO _IOR(CIO, 8, struct comedi32_rangeinfo_struct)
/*
* N.B. COMEDI32_CMD and COMEDI_CMD ought to use _IOWR, not _IOR.
* It's too late to change it now, but it only affects the command number.
*/
#define COMEDI32_CMD _IOR(CIO, 9, struct comedi32_cmd_struct)
/*
* N.B. COMEDI32_CMDTEST and COMEDI_CMDTEST ought to use _IOWR, not _IOR.
* It's too late to change it now, but it only affects the command number.
*/
#define COMEDI32_CMDTEST _IOR(CIO, 10, struct comedi32_cmd_struct)
#define COMEDI32_INSNLIST _IOR(CIO, 11, struct comedi32_insnlist_struct)
#define COMEDI32_INSN _IOR(CIO, 12, struct comedi32_insn_struct)
struct comedi32_chaninfo_struct {
unsigned int subdev;
compat_uptr_t maxdata_list; /* 32-bit 'unsigned int *' */
compat_uptr_t flaglist; /* 32-bit 'unsigned int *' */
compat_uptr_t rangelist; /* 32-bit 'unsigned int *' */
unsigned int unused[4];
};
struct comedi32_rangeinfo_struct {
unsigned int range_type;
compat_uptr_t range_ptr; /* 32-bit 'void *' */
};
struct comedi32_cmd_struct {
unsigned int subdev;
unsigned int flags;
unsigned int start_src;
unsigned int start_arg;
unsigned int scan_begin_src;
unsigned int scan_begin_arg;
unsigned int convert_src;
unsigned int convert_arg;
unsigned int scan_end_src;
unsigned int scan_end_arg;
unsigned int stop_src;
unsigned int stop_arg;
compat_uptr_t chanlist; /* 32-bit 'unsigned int *' */
unsigned int chanlist_len;
compat_uptr_t data; /* 32-bit 'short *' */
unsigned int data_len;
};
struct comedi32_insn_struct {
unsigned int insn;
unsigned int n;
compat_uptr_t data; /* 32-bit 'unsigned int *' */
unsigned int subdev;
unsigned int chanspec;
unsigned int unused[3];
};
struct comedi32_insnlist_struct {
unsigned int n_insns;
compat_uptr_t insns; /* 32-bit 'struct comedi_insn *' */
};
/* Handle translated ioctl. */
static int translated_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
if (file->f_op->unlocked_ioctl)
return file->f_op->unlocked_ioctl(file, cmd, arg);
return -ENOTTY;
}
/* Handle 32-bit COMEDI_CHANINFO ioctl. */
static int compat_chaninfo(struct file *file, unsigned long arg)
{
struct comedi_chaninfo __user *chaninfo;
struct comedi32_chaninfo_struct __user *chaninfo32;
int err;
union {
unsigned int uint;
compat_uptr_t uptr;
} temp;
chaninfo32 = compat_ptr(arg);
chaninfo = compat_alloc_user_space(sizeof(*chaninfo));
/* Copy chaninfo structure. Ignore unused members. */
if (!access_ok(chaninfo32, sizeof(*chaninfo32)) ||
!access_ok(chaninfo, sizeof(*chaninfo)))
return -EFAULT;
err = 0;
err |= __get_user(temp.uint, &chaninfo32->subdev);
err |= __put_user(temp.uint, &chaninfo->subdev);
err |= __get_user(temp.uptr, &chaninfo32->maxdata_list);
err |= __put_user(compat_ptr(temp.uptr), &chaninfo->maxdata_list);
err |= __get_user(temp.uptr, &chaninfo32->flaglist);
err |= __put_user(compat_ptr(temp.uptr), &chaninfo->flaglist);
err |= __get_user(temp.uptr, &chaninfo32->rangelist);
err |= __put_user(compat_ptr(temp.uptr), &chaninfo->rangelist);
if (err)
return -EFAULT;
return translated_ioctl(file, COMEDI_CHANINFO, (unsigned long)chaninfo);
}
/* Handle 32-bit COMEDI_RANGEINFO ioctl. */
static int compat_rangeinfo(struct file *file, unsigned long arg)
{
struct comedi_rangeinfo __user *rangeinfo;
struct comedi32_rangeinfo_struct __user *rangeinfo32;
int err;
union {
unsigned int uint;
compat_uptr_t uptr;
} temp;
rangeinfo32 = compat_ptr(arg);
rangeinfo = compat_alloc_user_space(sizeof(*rangeinfo));
/* Copy rangeinfo structure. */
if (!access_ok(rangeinfo32, sizeof(*rangeinfo32)) ||
!access_ok(rangeinfo, sizeof(*rangeinfo)))
return -EFAULT;
err = 0;
err |= __get_user(temp.uint, &rangeinfo32->range_type);
err |= __put_user(temp.uint, &rangeinfo->range_type);
err |= __get_user(temp.uptr, &rangeinfo32->range_ptr);
err |= __put_user(compat_ptr(temp.uptr), &rangeinfo->range_ptr);
if (err)
return -EFAULT;
return translated_ioctl(file, COMEDI_RANGEINFO,
(unsigned long)rangeinfo);
}
/* Copy 32-bit cmd structure to native cmd structure. */
static int get_compat_cmd(struct comedi_cmd __user *cmd,
struct comedi32_cmd_struct __user *cmd32)
{
int err;
union {
unsigned int uint;
compat_uptr_t uptr;
} temp;
/* Copy cmd structure. */
if (!access_ok(cmd32, sizeof(*cmd32)) ||
!access_ok(cmd, sizeof(*cmd)))
return -EFAULT;
err = 0;
err |= __get_user(temp.uint, &cmd32->subdev);
err |= __put_user(temp.uint, &cmd->subdev);
err |= __get_user(temp.uint, &cmd32->flags);
err |= __put_user(temp.uint, &cmd->flags);
err |= __get_user(temp.uint, &cmd32->start_src);
err |= __put_user(temp.uint, &cmd->start_src);
err |= __get_user(temp.uint, &cmd32->start_arg);
err |= __put_user(temp.uint, &cmd->start_arg);
err |= __get_user(temp.uint, &cmd32->scan_begin_src);
err |= __put_user(temp.uint, &cmd->scan_begin_src);
err |= __get_user(temp.uint, &cmd32->scan_begin_arg);
err |= __put_user(temp.uint, &cmd->scan_begin_arg);
err |= __get_user(temp.uint, &cmd32->convert_src);
err |= __put_user(temp.uint, &cmd->convert_src);
err |= __get_user(temp.uint, &cmd32->convert_arg);
err |= __put_user(temp.uint, &cmd->convert_arg);
err |= __get_user(temp.uint, &cmd32->scan_end_src);
err |= __put_user(temp.uint, &cmd->scan_end_src);
err |= __get_user(temp.uint, &cmd32->scan_end_arg);
err |= __put_user(temp.uint, &cmd->scan_end_arg);
err |= __get_user(temp.uint, &cmd32->stop_src);
err |= __put_user(temp.uint, &cmd->stop_src);
err |= __get_user(temp.uint, &cmd32->stop_arg);
err |= __put_user(temp.uint, &cmd->stop_arg);
err |= __get_user(temp.uptr, &cmd32->chanlist);
err |= __put_user((unsigned int __force *)compat_ptr(temp.uptr),
&cmd->chanlist);
err |= __get_user(temp.uint, &cmd32->chanlist_len);
err |= __put_user(temp.uint, &cmd->chanlist_len);
err |= __get_user(temp.uptr, &<
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