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- /*
- * 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>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- */
- #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(VERIFY_READ, chaninfo32, sizeof(*chaninfo32)) ||
- !access_ok(VERIFY_WRITE, 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(VERIFY_READ, rangeinfo32, sizeof(*rangeinfo32)) ||
- !access_ok(VERIFY_WRITE, 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(VERIFY_READ, cmd32, sizeof(*cmd32)) ||
- !access_ok(VERIFY_WRITE, 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, &cmd32->data);
- err |= __put_user(compat_ptr(temp.uptr), &cmd->data);
- err |= __get_user(temp.uint, &cmd32->data_len);
- err |= __put_user(temp.uint, &cmd->data_len);
- return err ? -EFAULT : 0;
- }
- /* Copy native cmd structure to 32-bit cmd structure. */
- static int put_compat_cmd(struct comedi32_cmd_struct __user *cmd32,
- struct comedi_cmd __user *cmd)
- {
- int err;
- unsigned int temp;
- /*
- * Copy back most of cmd structure.
- *
- * Assume the pointer values are already valid.
- * (Could use ptr_to_compat() to set them.)
- */
- if (!access_ok(VERIFY_READ, cmd, sizeof(*cmd)) ||
- !access_ok(VERIFY_WRITE, cmd32, sizeof(*cmd32)))
- return -EFAULT;
- err = 0;
- err |= __get_user(temp, &cmd->subdev);
- err |= __put_user(temp, &cmd32->subdev);
- err |= __get_user(temp, &cmd->flags);
- err |= __put_user(temp, &cmd32->flags);
- err |= __get_user(temp, &cmd->start_src);
- err |= __put_user(temp, &cmd32->start_src);
- err |= __get_user(temp, &cmd->start_arg);
- err |= __put_user(temp, &cmd32->start_arg);
- err |= __get_user(temp, &cmd->scan_begin_src);
- err |= __put_user(temp, &cmd32->scan_begin_src);
- err |= __get_user(temp, &cmd->scan_begin_arg);
- err |= __put_user(temp, &cmd32->scan_begin_arg);
- err |= __get_user(temp, &cmd->convert_src);
- err |= __put_user(temp, &cmd32->convert_src);
- err |= __get_user(temp, &cmd->convert_arg);
- err |= __put_user(temp, &cmd32->convert_arg);
- err |= __get_user(temp, &cmd->scan_end_src);
- err |= __put_user(temp, &cmd32->scan_end_src);
- err |= __get_user(temp, &cmd->scan_end_arg);
- err |= __put_user(temp, &cmd32->scan_end_arg);
- err |= __get_user(temp, &cmd->stop_src);
- err |= __put_user(temp, &cmd32->stop_src);
- err |= __get_user(temp, &cmd->stop_arg);
- err |= __put_user(temp, &cmd32->stop_arg);
- /* Assume chanlist pointer is unchanged. */
- err |= __get_user(temp, &cmd->chanlist_len);
- err |= __put_user(temp, &cmd32->chanlist_len);
- /* Assume data pointer is unchanged. */
- err |= __get_user(temp, &cmd->data_len);
- err |= __put_user(temp, &cmd32->data_len);
- return err ? -EFAULT : 0;
- }
- /* Handle 32-bit COMEDI_CMD ioctl. */
- static int compat_cmd(struct file *file, unsigned long arg)
- {
- struct comedi_cmd __user *cmd;
- struct comedi32_cmd_struct __user *cmd32;
- int rc, err;
- cmd32 = compat_ptr(arg);
- cmd = compat_alloc_user_space(sizeof(*cmd));
- rc = get_compat_cmd(cmd, cmd32);
- if (rc)
- return rc;
- rc = translated_ioctl(file, COMEDI_CMD, (unsigned long)cmd);
- if (rc == -EAGAIN) {
- /* Special case: copy cmd back to user. */
- err = put_compat_cmd(cmd32, cmd);
- if (err)
- rc = err;
- }
- return rc;
- }
- /* Handle 32-bit COMEDI_CMDTEST ioctl. */
- static int compat_cmdtest(struct file *file, unsigned long arg)
- {
- struct comedi_cmd __user *cmd;
- struct comedi32_cmd_struct __user *cmd32;
- int rc, err;
- cmd32 = compat_ptr(arg);
- cmd = compat_alloc_user_space(sizeof(*cmd));
- rc = get_compat_cmd(cmd, cmd32);
- if (rc)
- return rc;
- rc = translated_ioctl(file, COMEDI_CMDTEST, (unsigned long)cmd);
- if (rc < 0)
- return rc;
- err = put_compat_cmd(cmd32, cmd);
- if (err)
- rc = err;
- return rc;
- }
- /* Copy 32-bit insn structure to native insn structure. */
- static int get_compat_insn(struct comedi_insn __user *insn,
- struct comedi32_insn_struct __user *insn32)
- {
- int err;
- union {
- unsigned int uint;
- compat_uptr_t uptr;
- } temp;
- /* Copy insn structure. Ignore the unused members. */
- err = 0;
- if (!access_ok(VERIFY_READ, insn32, sizeof(*insn32)) ||
- !access_ok(VERIFY_WRITE, insn, sizeof(*insn)))
- return -EFAULT;
- err |= __get_user(temp.uint, &insn32->insn);
- err |= __put_user(temp.uint, &insn->insn);
- err |= __get_user(temp.uint, &insn32->n);
- err |= __put_user(temp.uint, &insn->n);
- err |= __get_user(temp.uptr, &insn32->data);
- err |= __put_user(compat_ptr(temp.uptr), &insn->data);
- err |= __get_user(temp.uint, &insn32->subdev);
- err |= __put_user(temp.uint, &insn->subdev);
- err |= __get_user(temp.uint, &insn32->chanspec);
- err |= __put_user(temp.uint, &insn->chanspec);
- return err ? -EFAULT : 0;
- }
- /* Handle 32-bit COMEDI_INSNLIST ioctl. */
- static int compat_insnlist(struct file *file, unsigned long arg)
- {
- struct combined_insnlist {
- struct comedi_insnlist insnlist;
- struct comedi_insn insn[1];
- } __user *s;
- struct comedi32_insnlist_struct __user *insnlist32;
- struct comedi32_insn_struct __user *insn32;
- compat_uptr_t uptr;
- unsigned int n_insns, n;
- int err, rc;
- insnlist32 = compat_ptr(arg);
- /* Get 32-bit insnlist structure. */
- if (!access_ok(VERIFY_READ, insnlist32, sizeof(*insnlist32)))
- return -EFAULT;
- err = 0;
- err |= __get_user(n_insns, &insnlist32->n_insns);
- err |= __get_user(uptr, &insnlist32->insns);
- insn32 = compat_ptr(uptr);
- if (err)
- return -EFAULT;
- /* Allocate user memory to copy insnlist and insns into. */
- s = compat_alloc_user_space(offsetof(struct combined_insnlist,
- insn[n_insns]));
- /* Set native insnlist structure. */
- if (!access_ok(VERIFY_WRITE, &s->insnlist, sizeof(s->insnlist)))
- return -EFAULT;
- err |= __put_user(n_insns, &s->insnlist.n_insns);
- err |= __put_user(&s->insn[0], &s->insnlist.insns);
- if (err)
- return -EFAULT;
- /* Copy insn structures. */
- for (n = 0; n < n_insns; n++) {
- rc = get_compat_insn(&s->insn[n], &insn32[n]);
- if (rc)
- return rc;
- }
- return translated_ioctl(file, COMEDI_INSNLIST,
- (unsigned long)&s->insnlist);
- }
- /* Handle 32-bit COMEDI_INSN ioctl. */
- static int compat_insn(struct file *file, unsigned long arg)
- {
- struct comedi_insn __user *insn;
- struct comedi32_insn_struct __user *insn32;
- int rc;
- insn32 = compat_ptr(arg);
- insn = compat_alloc_user_space(sizeof(*insn));
- rc = get_compat_insn(insn, insn32);
- if (rc)
- return rc;
- return translated_ioctl(file, COMEDI_INSN, (unsigned long)insn);
- }
- /*
- * compat_ioctl file operation.
- *
- * Returns -ENOIOCTLCMD for unrecognised ioctl codes.
- */
- long comedi_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
- {
- int rc;
- switch (cmd) {
- case COMEDI_DEVCONFIG:
- case COMEDI_DEVINFO:
- case COMEDI_SUBDINFO:
- case COMEDI_BUFCONFIG:
- case COMEDI_BUFINFO:
- /* Just need to translate the pointer argument. */
- arg = (unsigned long)compat_ptr(arg);
- rc = translated_ioctl(file, cmd, arg);
- break;
- case COMEDI_LOCK:
- case COMEDI_UNLOCK:
- case COMEDI_CANCEL:
- case COMEDI_POLL:
- case COMEDI_SETRSUBD:
- case COMEDI_SETWSUBD:
- /* No translation needed. */
- rc = translated_ioctl(file, cmd, arg);
- break;
- case COMEDI32_CHANINFO:
- rc = compat_chaninfo(file, arg);
- break;
- case COMEDI32_RANGEINFO:
- rc = compat_rangeinfo(file, arg);
- break;
- case COMEDI32_CMD:
- rc = compat_cmd(file, arg);
- break;
- case COMEDI32_CMDTEST:
- rc = compat_cmdtest(file, arg);
- break;
- case COMEDI32_INSNLIST:
- rc = compat_insnlist(file, arg);
- break;
- case COMEDI32_INSN:
- rc = compat_insn(file, arg);
- break;
- default:
- rc = -ENOIOCTLCMD;
- break;
- }
- return rc;
- }
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