--- /dev/null
+/*
+ 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.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#define __NO_VERSION__
+#include <linux/comedi.h>
+#include <linux/smp_lock.h>
+#include <asm/uaccess.h>
+
+#include "comedi_compat32.h"
+
+#ifdef CONFIG_COMPAT
+
+#define COMEDI32_CHANINFO _IOR(CIO,3,comedi32_chaninfo)
+#define COMEDI32_RANGEINFO _IOR(CIO,8,comedi32_rangeinfo)
+#define COMEDI32_CMD _IOR(CIO,9,comedi32_cmd)
+/* 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,comedi32_cmd)
+#define COMEDI32_INSNLIST _IOR(CIO,11,comedi32_insnlist)
+#define COMEDI32_INSN _IOR(CIO,12,comedi32_insn)
+
+typedef struct comedi32_chaninfo_struct {
+ unsigned int subdev;
+ compat_uptr_t maxdata_list; /* 32-bit 'lsampl_t *' */
+ compat_uptr_t flaglist; /* 32-bit 'unsigned int *' */
+ compat_uptr_t rangelist; /* 32-bit 'unsigned int *' */
+ unsigned int unused[4];
+} comedi32_chaninfo;
+
+typedef struct comedi32_rangeinfo_struct {
+ unsigned int range_type;
+ compat_uptr_t range_ptr; /* 32-bit 'void *' */
+} comedi32_rangeinfo;
+
+typedef 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 'sampl_t *' */
+ unsigned int data_len;
+} comedi32_cmd;
+
+typedef struct comedi32_insn_struct {
+ unsigned int insn;
+ unsigned int n;
+ compat_uptr_t data; /* 32-bit 'lsampl_t *' */
+ unsigned int subdev;
+ unsigned int chanspec;
+ unsigned int unused[3];
+} comedi32_insn;
+
+typedef struct comedi32_insnlist_struct {
+ unsigned int n_insns;
+ compat_uptr_t insns; /* 32-bit 'comedi_insn *' */
+} comedi32_insnlist;
+
+/* Handle translated ioctl. */
+static int translated_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ if (!file->f_op) {
+ return -ENOTTY;
+ }
+#ifdef HAVE_UNLOCKED_IOCTL
+ if (file->f_op->unlocked_ioctl) {
+ int rc = (int)(*file->f_op->unlocked_ioctl)(file, cmd, arg);
+ if (rc == -ENOIOCTLCMD) {
+ rc = -ENOTTY;
+ }
+ return rc;
+ }
+#endif
+ if (file->f_op->ioctl) {
+ int rc;
+ lock_kernel();
+ rc = (*file->f_op->ioctl)(file->f_dentry->d_inode,
+ file, cmd, arg);
+ unlock_kernel();
+ return rc;
+ }
+ return -ENOTTY;
+}
+
+/* Handle 32-bit COMEDI_CHANINFO ioctl. */
+static int compat_chaninfo(struct file *file, unsigned long arg)
+{
+ comedi_chaninfo __user *chaninfo;
+ comedi32_chaninfo __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)
+{
+ comedi_rangeinfo __user *rangeinfo;
+ comedi32_rangeinfo __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(comedi_cmd __user *cmd,
+ comedi32_cmd __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(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(comedi32_cmd __user *cmd32, comedi_cmd __user *cmd)
+{
+ /* N.B. Assume the pointer values in the 32-bit cmd structure are
+ * still valid from when they were copied originally.
+ * (Could use ptr_to_compat(), but it wasn't implemented until
+ * kernel version 2.6.11.) */
+ 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, but that wasn't implemented
+ * until kernel version 2.6.11.) */
+ 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)
+{
+ comedi_cmd __user *cmd;
+ comedi32_cmd __user *cmd32;
+ int rc;
+
+ cmd32 = compat_ptr(arg);
+ cmd = compat_alloc_user_space(sizeof(*cmd));
+
+ rc = get_compat_cmd(cmd, cmd32);
+ if (rc) {
+ return rc;
+ }
+
+ return translated_ioctl(file, COMEDI_CMD, (unsigned long)cmd);
+}
+
+/* Handle 32-bit COMEDI_CMDTEST ioctl. */
+static int compat_cmdtest(struct file *file, unsigned long arg)
+{
+ comedi_cmd __user *cmd;
+ comedi32_cmd __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(comedi_insn __user *insn,
+ comedi32_insn __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 {
+ comedi_insnlist insnlist;
+ comedi_insn insn[1];
+ } __user *s;
+ comedi32_insnlist __user *insnlist32;
+ comedi32_insn __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)
+{
+ comedi_insn __user *insn;
+ comedi32_insn __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);
+}
+
+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:
+ /* 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;
+}
+
+#ifndef HAVE_COMPAT_IOCTL /* defined in <linux/fs.h> 2.6.11 onwards */
+
+/*
+ * Brain-dead ioctl compatibility for 2.6.10 and earlier.
+ *
+ * It's brain-dead because cmd numbers need to be unique system-wide!
+ * The comedi driver could end up attempting to execute ioctls for non-Comedi
+ * devices because it registered the system-wide cmd code first. Similarly,
+ * another driver could end up attempting to execute ioctls for a Comedi
+ * device because it registered the cmd code first. Chaos ensues.
+ */
+
+static int mapped_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg,
+ struct file *file)
+{
+ /* Make sure we are dealing with a Comedi device. */
+ if (imajor(file->f_dentry->d_inode) != COMEDI_MAJOR) {
+ return -ENOTTY;
+ }
+ return (int)comedi_compat_ioctl(file, cmd, arg);
+}
+
+struct ioctl32_map {
+ unsigned int cmd;
+ int (*handler)(unsigned int, unsigned int, unsigned long,
+ struct file *);
+ int registered;
+};
+
+static struct ioctl32_map comedi_ioctl32_map[] = {
+ { COMEDI_DEVCONFIG, mapped_ioctl, 0 },
+ { COMEDI_DEVINFO, mapped_ioctl, 0 },
+ { COMEDI_SUBDINFO, mapped_ioctl, 0 },
+ { COMEDI_BUFCONFIG, mapped_ioctl, 0 },
+ { COMEDI_BUFINFO, mapped_ioctl, 0 },
+ { COMEDI_LOCK, mapped_ioctl, 0 },
+ { COMEDI_UNLOCK, mapped_ioctl, 0 },
+ { COMEDI_CANCEL, mapped_ioctl, 0 },
+ { COMEDI_POLL, mapped_ioctl, 0 },
+ { COMEDI32_CHANINFO, mapped_ioctl, 0 },
+ { COMEDI32_RANGEINFO, mapped_ioctl, 0 },
+ { COMEDI32_CMD, mapped_ioctl, 0 },
+ { COMEDI32_CMDTEST, mapped_ioctl, 0 },
+ { COMEDI32_INSNLIST, mapped_ioctl, 0 },
+ { COMEDI32_INSN, mapped_ioctl, 0 },
+};
+
+#define NUM_IOCTL32_MAPS ARRAY_SIZE(comedi_ioctl32_map)
+
+/* Register system-wide 32-bit ioctl handlers. */
+void comedi_register_ioctl32(void)
+{
+ int n, rc;
+
+ for (n = 0; n < NUM_IOCTL32_MAPS; n++) {
+ rc = register_ioctl32_conversion(comedi_ioctl32_map[n].cmd,
+ comedi_ioctl32_map[n].handler);
+ if (rc) {
+ printk(KERN_WARNING
+ "comedi: failed to register 32-bit "
+ "compatible ioctl handler for 0x%X - "
+ "expect bad things to happen!\n",
+ comedi_ioctl32_map[n].cmd);
+ }
+ comedi_ioctl32_map[n].registered = !rc;
+ }
+}
+
+/* Unregister system-wide 32-bit ioctl translations. */
+void comedi_unregister_ioctl32(void)
+{
+ int n, rc;
+
+ for (n = 0; n < NUM_IOCTL32_MAPS; n++) {
+ if (comedi_ioctl32_map[n].registered) {
+ rc = unregister_ioctl32_conversion(
+ comedi_ioctl32_map[n].cmd,
+ comedi_ioctl32_map[n].handler);
+ if (rc) {
+ printk(KERN_ERR
+ "comedi: failed to unregister 32-bit "
+ "compatible ioctl handler for 0x%X - "
+ "expect kernel Oops!\n",
+ comedi_ioctl32_map[n].cmd);
+ } else {
+ comedi_ioctl32_map[n].registered = 0;
+ }
+ }
+ }
+}
+
+#endif /* HAVE_COMPAT_IOCTL */
+
+#endif /* CONFIG_COMPAT */
projects / comedi.git / commitdiff