David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1 | /* |
| 2 | comedi/comedi_compat32.c |
| 3 | 32-bit ioctl compatibility for 64-bit comedi kernel module. |
| 4 | |
| 5 | Author: Ian Abbott, MEV Ltd. <abbotti@mev.co.uk> |
| 6 | Copyright (C) 2007 MEV Ltd. <http://www.mev.co.uk/> |
| 7 | |
| 8 | COMEDI - Linux Control and Measurement Device Interface |
| 9 | Copyright (C) 1997-2007 David A. Schleef <ds@schleef.org> |
| 10 | |
| 11 | This program is free software; you can redistribute it and/or modify |
| 12 | it under the terms of the GNU General Public License as published by |
| 13 | the Free Software Foundation; either version 2 of the License, or |
| 14 | (at your option) any later version. |
| 15 | |
| 16 | This program is distributed in the hope that it will be useful, |
| 17 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | GNU General Public License for more details. |
| 20 | |
| 21 | You should have received a copy of the GNU General Public License |
| 22 | along with this program; if not, write to the Free Software |
| 23 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 24 | |
| 25 | */ |
| 26 | |
| 27 | #define __NO_VERSION__ |
| 28 | #include "comedi.h" |
| 29 | #include <linux/smp_lock.h> |
| 30 | #include <asm/uaccess.h> |
| 31 | |
| 32 | #include "comedi_compat32.h" |
| 33 | |
| 34 | #ifdef CONFIG_COMPAT |
| 35 | |
| 36 | #ifndef HAVE_COMPAT_IOCTL |
| 37 | #include <linux/ioctl32.h> /* for (un)register_ioctl32_conversion */ |
| 38 | #endif |
| 39 | |
Bill Pemberton | 8086fff | 2009-03-16 22:03:35 -0400 | [diff] [blame] | 40 | #define COMEDI32_CHANINFO _IOR(CIO, 3, comedi32_chaninfo) |
Bill Pemberton | bf8db92e | 2009-03-16 22:04:29 -0400 | [diff] [blame] | 41 | #define COMEDI32_RANGEINFO _IOR(CIO, 8, (struct comedi32_rangeinfo_struct)) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 42 | /* N.B. COMEDI32_CMD and COMEDI_CMD ought to use _IOWR, not _IOR. |
| 43 | * It's too late to change it now, but it only affects the command number. */ |
Bill Pemberton | bf8db92e | 2009-03-16 22:04:29 -0400 | [diff] [blame] | 44 | #define COMEDI32_CMD _IOR(CIO, 9, (struct comedi32_cmd_struct)) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 45 | /* N.B. COMEDI32_CMDTEST and COMEDI_CMDTEST ought to use _IOWR, not _IOR. |
| 46 | * It's too late to change it now, but it only affects the command number. */ |
Bill Pemberton | bf8db92e | 2009-03-16 22:04:29 -0400 | [diff] [blame] | 47 | #define COMEDI32_CMDTEST _IOR(CIO, 10, (struct comedi32_cmd_struct)) |
| 48 | #define COMEDI32_INSNLIST _IOR(CIO, 11, (struct comedi32_insnlist_struct)) |
| 49 | #define COMEDI32_INSN _IOR(CIO, 12, (struct comedi32_insn_struct)) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 50 | |
Bill Pemberton | bf8db92e | 2009-03-16 22:04:29 -0400 | [diff] [blame] | 51 | struct comedi32_chaninfo_struct { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 52 | unsigned int subdev; |
Bill Pemberton | 790c554 | 2009-03-16 22:05:02 -0400 | [diff] [blame] | 53 | compat_uptr_t maxdata_list; /* 32-bit 'unsigned int *' */ |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 54 | compat_uptr_t flaglist; /* 32-bit 'unsigned int *' */ |
| 55 | compat_uptr_t rangelist; /* 32-bit 'unsigned int *' */ |
| 56 | unsigned int unused[4]; |
Bill Pemberton | bf8db92e | 2009-03-16 22:04:29 -0400 | [diff] [blame] | 57 | }; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 58 | |
Bill Pemberton | bf8db92e | 2009-03-16 22:04:29 -0400 | [diff] [blame] | 59 | struct comedi32_rangeinfo_struct { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 60 | unsigned int range_type; |
| 61 | compat_uptr_t range_ptr; /* 32-bit 'void *' */ |
Bill Pemberton | bf8db92e | 2009-03-16 22:04:29 -0400 | [diff] [blame] | 62 | }; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 63 | |
Bill Pemberton | bf8db92e | 2009-03-16 22:04:29 -0400 | [diff] [blame] | 64 | struct comedi32_cmd_struct { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 65 | unsigned int subdev; |
| 66 | unsigned int flags; |
| 67 | unsigned int start_src; |
| 68 | unsigned int start_arg; |
| 69 | unsigned int scan_begin_src; |
| 70 | unsigned int scan_begin_arg; |
| 71 | unsigned int convert_src; |
| 72 | unsigned int convert_arg; |
| 73 | unsigned int scan_end_src; |
| 74 | unsigned int scan_end_arg; |
| 75 | unsigned int stop_src; |
| 76 | unsigned int stop_arg; |
| 77 | compat_uptr_t chanlist; /* 32-bit 'unsigned int *' */ |
| 78 | unsigned int chanlist_len; |
Bill Pemberton | 790c554 | 2009-03-16 22:05:02 -0400 | [diff] [blame] | 79 | compat_uptr_t data; /* 32-bit 'short *' */ |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 80 | unsigned int data_len; |
Bill Pemberton | bf8db92e | 2009-03-16 22:04:29 -0400 | [diff] [blame] | 81 | }; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 82 | |
Bill Pemberton | bf8db92e | 2009-03-16 22:04:29 -0400 | [diff] [blame] | 83 | struct comedi32_insn_struct { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 84 | unsigned int insn; |
| 85 | unsigned int n; |
Bill Pemberton | 790c554 | 2009-03-16 22:05:02 -0400 | [diff] [blame] | 86 | compat_uptr_t data; /* 32-bit 'unsigned int *' */ |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 87 | unsigned int subdev; |
| 88 | unsigned int chanspec; |
| 89 | unsigned int unused[3]; |
Bill Pemberton | bf8db92e | 2009-03-16 22:04:29 -0400 | [diff] [blame] | 90 | }; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 91 | |
Bill Pemberton | bf8db92e | 2009-03-16 22:04:29 -0400 | [diff] [blame] | 92 | struct comedi32_insnlist_struct { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 93 | unsigned int n_insns; |
Bill Pemberton | 90035c0 | 2009-03-16 22:05:53 -0400 | [diff] [blame] | 94 | compat_uptr_t insns; /* 32-bit 'struct comedi_insn *' */ |
Bill Pemberton | bf8db92e | 2009-03-16 22:04:29 -0400 | [diff] [blame] | 95 | }; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 96 | |
| 97 | /* Handle translated ioctl. */ |
| 98 | static int translated_ioctl(struct file *file, unsigned int cmd, |
| 99 | unsigned long arg) |
| 100 | { |
Bill Pemberton | 82675f3 | 2009-03-16 22:04:23 -0400 | [diff] [blame] | 101 | if (!file->f_op) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 102 | return -ENOTTY; |
Bill Pemberton | 82675f3 | 2009-03-16 22:04:23 -0400 | [diff] [blame] | 103 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 104 | #ifdef HAVE_UNLOCKED_IOCTL |
| 105 | if (file->f_op->unlocked_ioctl) { |
| 106 | int rc = (int)(*file->f_op->unlocked_ioctl)(file, cmd, arg); |
Bill Pemberton | 82675f3 | 2009-03-16 22:04:23 -0400 | [diff] [blame] | 107 | if (rc == -ENOIOCTLCMD) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 108 | rc = -ENOTTY; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 109 | return rc; |
| 110 | } |
| 111 | #endif |
| 112 | if (file->f_op->ioctl) { |
| 113 | int rc; |
| 114 | lock_kernel(); |
| 115 | rc = (*file->f_op->ioctl)(file->f_dentry->d_inode, |
| 116 | file, cmd, arg); |
| 117 | unlock_kernel(); |
| 118 | return rc; |
| 119 | } |
| 120 | return -ENOTTY; |
| 121 | } |
| 122 | |
| 123 | /* Handle 32-bit COMEDI_CHANINFO ioctl. */ |
| 124 | static int compat_chaninfo(struct file *file, unsigned long arg) |
| 125 | { |
Bill Pemberton | bf8db92e | 2009-03-16 22:04:29 -0400 | [diff] [blame] | 126 | struct comedi_chaninfo_struct __user *chaninfo; |
| 127 | struct comedi32_chaninfo_struct __user *chaninfo32; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 128 | int err; |
| 129 | union { |
| 130 | unsigned int uint; |
| 131 | compat_uptr_t uptr; |
| 132 | } temp; |
| 133 | |
| 134 | chaninfo32 = compat_ptr(arg); |
| 135 | chaninfo = compat_alloc_user_space(sizeof(*chaninfo)); |
| 136 | |
| 137 | /* Copy chaninfo structure. Ignore unused members. */ |
| 138 | if (!access_ok(VERIFY_READ, chaninfo32, sizeof(*chaninfo32)) |
| 139 | || !access_ok(VERIFY_WRITE, chaninfo, |
| 140 | sizeof(*chaninfo))) { |
| 141 | return -EFAULT; |
| 142 | } |
| 143 | err = 0; |
| 144 | err |= __get_user(temp.uint, &chaninfo32->subdev); |
| 145 | err |= __put_user(temp.uint, &chaninfo->subdev); |
| 146 | err |= __get_user(temp.uptr, &chaninfo32->maxdata_list); |
| 147 | err |= __put_user(compat_ptr(temp.uptr), &chaninfo->maxdata_list); |
| 148 | err |= __get_user(temp.uptr, &chaninfo32->flaglist); |
| 149 | err |= __put_user(compat_ptr(temp.uptr), &chaninfo->flaglist); |
| 150 | err |= __get_user(temp.uptr, &chaninfo32->rangelist); |
| 151 | err |= __put_user(compat_ptr(temp.uptr), &chaninfo->rangelist); |
Bill Pemberton | 82675f3 | 2009-03-16 22:04:23 -0400 | [diff] [blame] | 152 | if (err) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 153 | return -EFAULT; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 154 | |
| 155 | return translated_ioctl(file, COMEDI_CHANINFO, (unsigned long)chaninfo); |
| 156 | } |
| 157 | |
| 158 | /* Handle 32-bit COMEDI_RANGEINFO ioctl. */ |
| 159 | static int compat_rangeinfo(struct file *file, unsigned long arg) |
| 160 | { |
| 161 | comedi_rangeinfo __user *rangeinfo; |
Bill Pemberton | bf8db92e | 2009-03-16 22:04:29 -0400 | [diff] [blame] | 162 | struct comedi32_rangeinfo_struct __user *rangeinfo32; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 163 | int err; |
| 164 | union { |
| 165 | unsigned int uint; |
| 166 | compat_uptr_t uptr; |
| 167 | } temp; |
| 168 | |
| 169 | rangeinfo32 = compat_ptr(arg); |
| 170 | rangeinfo = compat_alloc_user_space(sizeof(*rangeinfo)); |
| 171 | |
| 172 | /* Copy rangeinfo structure. */ |
| 173 | if (!access_ok(VERIFY_READ, rangeinfo32, sizeof(*rangeinfo32)) |
| 174 | || !access_ok(VERIFY_WRITE, rangeinfo, |
| 175 | sizeof(*rangeinfo))) { |
| 176 | return -EFAULT; |
| 177 | } |
| 178 | err = 0; |
| 179 | err |= __get_user(temp.uint, &rangeinfo32->range_type); |
| 180 | err |= __put_user(temp.uint, &rangeinfo->range_type); |
| 181 | err |= __get_user(temp.uptr, &rangeinfo32->range_ptr); |
| 182 | err |= __put_user(compat_ptr(temp.uptr), &rangeinfo->range_ptr); |
Bill Pemberton | 82675f3 | 2009-03-16 22:04:23 -0400 | [diff] [blame] | 183 | if (err) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 184 | return -EFAULT; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 185 | |
| 186 | return translated_ioctl(file, COMEDI_RANGEINFO, |
| 187 | (unsigned long)rangeinfo); |
| 188 | } |
| 189 | |
| 190 | /* Copy 32-bit cmd structure to native cmd structure. */ |
Bill Pemberton | ea6d0d4 | 2009-03-16 22:05:47 -0400 | [diff] [blame] | 191 | static int get_compat_cmd(struct comedi_cmd __user *cmd, |
Bill Pemberton | bf8db92e | 2009-03-16 22:04:29 -0400 | [diff] [blame] | 192 | struct comedi32_cmd_struct __user *cmd32) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 193 | { |
| 194 | int err; |
| 195 | union { |
| 196 | unsigned int uint; |
| 197 | compat_uptr_t uptr; |
| 198 | } temp; |
| 199 | |
| 200 | /* Copy cmd structure. */ |
| 201 | if (!access_ok(VERIFY_READ, cmd32, sizeof(*cmd32)) |
| 202 | || !access_ok(VERIFY_WRITE, cmd, sizeof(*cmd))) { |
| 203 | return -EFAULT; |
| 204 | } |
| 205 | err = 0; |
| 206 | err |= __get_user(temp.uint, &cmd32->subdev); |
| 207 | err |= __put_user(temp.uint, &cmd->subdev); |
| 208 | err |= __get_user(temp.uint, &cmd32->flags); |
| 209 | err |= __put_user(temp.uint, &cmd->flags); |
| 210 | err |= __get_user(temp.uint, &cmd32->start_src); |
| 211 | err |= __put_user(temp.uint, &cmd->start_src); |
| 212 | err |= __get_user(temp.uint, &cmd32->start_arg); |
| 213 | err |= __put_user(temp.uint, &cmd->start_arg); |
| 214 | err |= __get_user(temp.uint, &cmd32->scan_begin_src); |
| 215 | err |= __put_user(temp.uint, &cmd->scan_begin_src); |
| 216 | err |= __get_user(temp.uint, &cmd32->scan_begin_arg); |
| 217 | err |= __put_user(temp.uint, &cmd->scan_begin_arg); |
| 218 | err |= __get_user(temp.uint, &cmd32->convert_src); |
| 219 | err |= __put_user(temp.uint, &cmd->convert_src); |
| 220 | err |= __get_user(temp.uint, &cmd32->convert_arg); |
| 221 | err |= __put_user(temp.uint, &cmd->convert_arg); |
| 222 | err |= __get_user(temp.uint, &cmd32->scan_end_src); |
| 223 | err |= __put_user(temp.uint, &cmd->scan_end_src); |
| 224 | err |= __get_user(temp.uint, &cmd32->scan_end_arg); |
| 225 | err |= __put_user(temp.uint, &cmd->scan_end_arg); |
| 226 | err |= __get_user(temp.uint, &cmd32->stop_src); |
| 227 | err |= __put_user(temp.uint, &cmd->stop_src); |
| 228 | err |= __get_user(temp.uint, &cmd32->stop_arg); |
| 229 | err |= __put_user(temp.uint, &cmd->stop_arg); |
| 230 | err |= __get_user(temp.uptr, &cmd32->chanlist); |
| 231 | err |= __put_user(compat_ptr(temp.uptr), &cmd->chanlist); |
| 232 | err |= __get_user(temp.uint, &cmd32->chanlist_len); |
| 233 | err |= __put_user(temp.uint, &cmd->chanlist_len); |
| 234 | err |= __get_user(temp.uptr, &cmd32->data); |
| 235 | err |= __put_user(compat_ptr(temp.uptr), &cmd->data); |
| 236 | err |= __get_user(temp.uint, &cmd32->data_len); |
| 237 | err |= __put_user(temp.uint, &cmd->data_len); |
| 238 | return err ? -EFAULT : 0; |
| 239 | } |
| 240 | |
| 241 | /* Copy native cmd structure to 32-bit cmd structure. */ |
Bill Pemberton | ea6d0d4 | 2009-03-16 22:05:47 -0400 | [diff] [blame] | 242 | static int put_compat_cmd(struct comedi32_cmd_struct __user *cmd32, struct comedi_cmd __user *cmd) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 243 | { |
| 244 | int err; |
| 245 | unsigned int temp; |
| 246 | |
| 247 | /* Copy back most of cmd structure. */ |
| 248 | /* Assume the pointer values are already valid. */ |
| 249 | /* (Could use ptr_to_compat() to set them, but that wasn't implemented |
| 250 | * until kernel version 2.6.11.) */ |
| 251 | if (!access_ok(VERIFY_READ, cmd, sizeof(*cmd)) |
| 252 | || !access_ok(VERIFY_WRITE, cmd32, sizeof(*cmd32))) { |
| 253 | return -EFAULT; |
| 254 | } |
| 255 | err = 0; |
| 256 | err |= __get_user(temp, &cmd->subdev); |
| 257 | err |= __put_user(temp, &cmd32->subdev); |
| 258 | err |= __get_user(temp, &cmd->flags); |
| 259 | err |= __put_user(temp, &cmd32->flags); |
| 260 | err |= __get_user(temp, &cmd->start_src); |
| 261 | err |= __put_user(temp, &cmd32->start_src); |
| 262 | err |= __get_user(temp, &cmd->start_arg); |
| 263 | err |= __put_user(temp, &cmd32->start_arg); |
| 264 | err |= __get_user(temp, &cmd->scan_begin_src); |
| 265 | err |= __put_user(temp, &cmd32->scan_begin_src); |
| 266 | err |= __get_user(temp, &cmd->scan_begin_arg); |
| 267 | err |= __put_user(temp, &cmd32->scan_begin_arg); |
| 268 | err |= __get_user(temp, &cmd->convert_src); |
| 269 | err |= __put_user(temp, &cmd32->convert_src); |
| 270 | err |= __get_user(temp, &cmd->convert_arg); |
| 271 | err |= __put_user(temp, &cmd32->convert_arg); |
| 272 | err |= __get_user(temp, &cmd->scan_end_src); |
| 273 | err |= __put_user(temp, &cmd32->scan_end_src); |
| 274 | err |= __get_user(temp, &cmd->scan_end_arg); |
| 275 | err |= __put_user(temp, &cmd32->scan_end_arg); |
| 276 | err |= __get_user(temp, &cmd->stop_src); |
| 277 | err |= __put_user(temp, &cmd32->stop_src); |
| 278 | err |= __get_user(temp, &cmd->stop_arg); |
| 279 | err |= __put_user(temp, &cmd32->stop_arg); |
| 280 | /* Assume chanlist pointer is unchanged. */ |
| 281 | err |= __get_user(temp, &cmd->chanlist_len); |
| 282 | err |= __put_user(temp, &cmd32->chanlist_len); |
| 283 | /* Assume data pointer is unchanged. */ |
| 284 | err |= __get_user(temp, &cmd->data_len); |
| 285 | err |= __put_user(temp, &cmd32->data_len); |
| 286 | return err ? -EFAULT : 0; |
| 287 | } |
| 288 | |
| 289 | /* Handle 32-bit COMEDI_CMD ioctl. */ |
| 290 | static int compat_cmd(struct file *file, unsigned long arg) |
| 291 | { |
Bill Pemberton | ea6d0d4 | 2009-03-16 22:05:47 -0400 | [diff] [blame] | 292 | struct comedi_cmd __user *cmd; |
Bill Pemberton | bf8db92e | 2009-03-16 22:04:29 -0400 | [diff] [blame] | 293 | struct comedi32_cmd_struct __user *cmd32; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 294 | int rc; |
| 295 | |
| 296 | cmd32 = compat_ptr(arg); |
| 297 | cmd = compat_alloc_user_space(sizeof(*cmd)); |
| 298 | |
| 299 | rc = get_compat_cmd(cmd, cmd32); |
Bill Pemberton | 82675f3 | 2009-03-16 22:04:23 -0400 | [diff] [blame] | 300 | if (rc) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 301 | return rc; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 302 | |
| 303 | return translated_ioctl(file, COMEDI_CMD, (unsigned long)cmd); |
| 304 | } |
| 305 | |
| 306 | /* Handle 32-bit COMEDI_CMDTEST ioctl. */ |
| 307 | static int compat_cmdtest(struct file *file, unsigned long arg) |
| 308 | { |
Bill Pemberton | ea6d0d4 | 2009-03-16 22:05:47 -0400 | [diff] [blame] | 309 | struct comedi_cmd __user *cmd; |
Bill Pemberton | bf8db92e | 2009-03-16 22:04:29 -0400 | [diff] [blame] | 310 | struct comedi32_cmd_struct __user *cmd32; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 311 | int rc, err; |
| 312 | |
| 313 | cmd32 = compat_ptr(arg); |
| 314 | cmd = compat_alloc_user_space(sizeof(*cmd)); |
| 315 | |
| 316 | rc = get_compat_cmd(cmd, cmd32); |
Bill Pemberton | 82675f3 | 2009-03-16 22:04:23 -0400 | [diff] [blame] | 317 | if (rc) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 318 | return rc; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 319 | |
| 320 | rc = translated_ioctl(file, COMEDI_CMDTEST, (unsigned long)cmd); |
Bill Pemberton | 82675f3 | 2009-03-16 22:04:23 -0400 | [diff] [blame] | 321 | if (rc < 0) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 322 | return rc; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 323 | |
| 324 | err = put_compat_cmd(cmd32, cmd); |
Bill Pemberton | 82675f3 | 2009-03-16 22:04:23 -0400 | [diff] [blame] | 325 | if (err) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 326 | rc = err; |
Bill Pemberton | 82675f3 | 2009-03-16 22:04:23 -0400 | [diff] [blame] | 327 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 328 | return rc; |
| 329 | } |
| 330 | |
| 331 | /* Copy 32-bit insn structure to native insn structure. */ |
Bill Pemberton | 90035c0 | 2009-03-16 22:05:53 -0400 | [diff] [blame] | 332 | static int get_compat_insn(struct comedi_insn __user *insn, |
Bill Pemberton | bf8db92e | 2009-03-16 22:04:29 -0400 | [diff] [blame] | 333 | struct comedi32_insn_struct __user *insn32) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 334 | { |
| 335 | int err; |
| 336 | union { |
| 337 | unsigned int uint; |
| 338 | compat_uptr_t uptr; |
| 339 | } temp; |
| 340 | |
| 341 | /* Copy insn structure. Ignore the unused members. */ |
| 342 | err = 0; |
| 343 | if (!access_ok(VERIFY_READ, insn32, sizeof(*insn32)) |
Bill Pemberton | 82675f3 | 2009-03-16 22:04:23 -0400 | [diff] [blame] | 344 | || !access_ok(VERIFY_WRITE, insn, sizeof(*insn))) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 345 | return -EFAULT; |
Bill Pemberton | 82675f3 | 2009-03-16 22:04:23 -0400 | [diff] [blame] | 346 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 347 | err |= __get_user(temp.uint, &insn32->insn); |
| 348 | err |= __put_user(temp.uint, &insn->insn); |
| 349 | err |= __get_user(temp.uint, &insn32->n); |
| 350 | err |= __put_user(temp.uint, &insn->n); |
| 351 | err |= __get_user(temp.uptr, &insn32->data); |
| 352 | err |= __put_user(compat_ptr(temp.uptr), &insn->data); |
| 353 | err |= __get_user(temp.uint, &insn32->subdev); |
| 354 | err |= __put_user(temp.uint, &insn->subdev); |
| 355 | err |= __get_user(temp.uint, &insn32->chanspec); |
| 356 | err |= __put_user(temp.uint, &insn->chanspec); |
| 357 | return err ? -EFAULT : 0; |
| 358 | } |
| 359 | |
| 360 | /* Handle 32-bit COMEDI_INSNLIST ioctl. */ |
| 361 | static int compat_insnlist(struct file *file, unsigned long arg) |
| 362 | { |
| 363 | struct combined_insnlist { |
Bill Pemberton | da613f4 | 2009-03-16 22:05:59 -0400 | [diff] [blame^] | 364 | struct comedi_insnlist insnlist; |
Bill Pemberton | 90035c0 | 2009-03-16 22:05:53 -0400 | [diff] [blame] | 365 | struct comedi_insn insn[1]; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 366 | } __user *s; |
Bill Pemberton | bf8db92e | 2009-03-16 22:04:29 -0400 | [diff] [blame] | 367 | struct comedi32_insnlist_struct __user *insnlist32; |
| 368 | struct comedi32_insn_struct __user *insn32; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 369 | compat_uptr_t uptr; |
| 370 | unsigned int n_insns, n; |
| 371 | int err, rc; |
| 372 | |
| 373 | insnlist32 = compat_ptr(arg); |
| 374 | |
| 375 | /* Get 32-bit insnlist structure. */ |
| 376 | if (!access_ok(VERIFY_READ, insnlist32, sizeof(*insnlist32))) { |
| 377 | return -EFAULT; |
| 378 | } |
| 379 | err = 0; |
| 380 | err |= __get_user(n_insns, &insnlist32->n_insns); |
| 381 | err |= __get_user(uptr, &insnlist32->insns); |
| 382 | insn32 = compat_ptr(uptr); |
Bill Pemberton | 82675f3 | 2009-03-16 22:04:23 -0400 | [diff] [blame] | 383 | if (err) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 384 | return -EFAULT; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 385 | |
| 386 | /* Allocate user memory to copy insnlist and insns into. */ |
| 387 | s = compat_alloc_user_space(offsetof(struct combined_insnlist, |
| 388 | insn[n_insns])); |
| 389 | |
| 390 | /* Set native insnlist structure. */ |
| 391 | if (!access_ok(VERIFY_WRITE, &s->insnlist, sizeof(s->insnlist))) { |
| 392 | return -EFAULT; |
| 393 | } |
| 394 | err |= __put_user(n_insns, &s->insnlist.n_insns); |
| 395 | err |= __put_user(&s->insn[0], &s->insnlist.insns); |
Bill Pemberton | 82675f3 | 2009-03-16 22:04:23 -0400 | [diff] [blame] | 396 | if (err) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 397 | return -EFAULT; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 398 | |
| 399 | /* Copy insn structures. */ |
| 400 | for (n = 0; n < n_insns; n++) { |
| 401 | rc = get_compat_insn(&s->insn[n], &insn32[n]); |
Bill Pemberton | 82675f3 | 2009-03-16 22:04:23 -0400 | [diff] [blame] | 402 | if (rc) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 403 | return rc; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 404 | } |
| 405 | |
| 406 | return translated_ioctl(file, COMEDI_INSNLIST, |
| 407 | (unsigned long)&s->insnlist); |
| 408 | } |
| 409 | |
| 410 | /* Handle 32-bit COMEDI_INSN ioctl. */ |
| 411 | static int compat_insn(struct file *file, unsigned long arg) |
| 412 | { |
Bill Pemberton | 90035c0 | 2009-03-16 22:05:53 -0400 | [diff] [blame] | 413 | struct comedi_insn __user *insn; |
Bill Pemberton | bf8db92e | 2009-03-16 22:04:29 -0400 | [diff] [blame] | 414 | struct comedi32_insn_struct __user *insn32; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 415 | int rc; |
| 416 | |
| 417 | insn32 = compat_ptr(arg); |
| 418 | insn = compat_alloc_user_space(sizeof(*insn)); |
| 419 | |
| 420 | rc = get_compat_insn(insn, insn32); |
Bill Pemberton | 82675f3 | 2009-03-16 22:04:23 -0400 | [diff] [blame] | 421 | if (rc) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 422 | return rc; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 423 | |
| 424 | return translated_ioctl(file, COMEDI_INSN, (unsigned long)insn); |
| 425 | } |
| 426 | |
| 427 | /* Process untranslated ioctl. */ |
| 428 | /* Returns -ENOIOCTLCMD for unrecognised ioctl codes. */ |
| 429 | static inline int raw_ioctl(struct file *file, unsigned int cmd, |
| 430 | unsigned long arg) |
| 431 | { |
| 432 | int rc; |
| 433 | |
| 434 | switch (cmd) { |
| 435 | case COMEDI_DEVCONFIG: |
| 436 | case COMEDI_DEVINFO: |
| 437 | case COMEDI_SUBDINFO: |
| 438 | case COMEDI_BUFCONFIG: |
| 439 | case COMEDI_BUFINFO: |
| 440 | /* Just need to translate the pointer argument. */ |
| 441 | arg = (unsigned long)compat_ptr(arg); |
| 442 | rc = translated_ioctl(file, cmd, arg); |
| 443 | break; |
| 444 | case COMEDI_LOCK: |
| 445 | case COMEDI_UNLOCK: |
| 446 | case COMEDI_CANCEL: |
| 447 | case COMEDI_POLL: |
| 448 | /* No translation needed. */ |
| 449 | rc = translated_ioctl(file, cmd, arg); |
| 450 | break; |
| 451 | case COMEDI32_CHANINFO: |
| 452 | rc = compat_chaninfo(file, arg); |
| 453 | break; |
| 454 | case COMEDI32_RANGEINFO: |
| 455 | rc = compat_rangeinfo(file, arg); |
| 456 | break; |
| 457 | case COMEDI32_CMD: |
| 458 | rc = compat_cmd(file, arg); |
| 459 | break; |
| 460 | case COMEDI32_CMDTEST: |
| 461 | rc = compat_cmdtest(file, arg); |
| 462 | break; |
| 463 | case COMEDI32_INSNLIST: |
| 464 | rc = compat_insnlist(file, arg); |
| 465 | break; |
| 466 | case COMEDI32_INSN: |
| 467 | rc = compat_insn(file, arg); |
| 468 | break; |
| 469 | default: |
| 470 | rc = -ENOIOCTLCMD; |
| 471 | break; |
| 472 | } |
| 473 | return rc; |
| 474 | } |
| 475 | |
| 476 | #ifdef HAVE_COMPAT_IOCTL /* defined in <linux/fs.h> 2.6.11 onwards */ |
| 477 | |
| 478 | /* compat_ioctl file operation. */ |
| 479 | /* Returns -ENOIOCTLCMD for unrecognised ioctl codes. */ |
| 480 | long comedi_compat_ioctl(struct file *file, unsigned int cmd, |
| 481 | unsigned long arg) |
| 482 | { |
| 483 | return raw_ioctl(file, cmd, arg); |
| 484 | } |
| 485 | |
| 486 | #else /* HAVE_COMPAT_IOCTL */ |
| 487 | |
| 488 | /* |
| 489 | * Brain-dead ioctl compatibility for 2.6.10 and earlier. |
| 490 | * |
| 491 | * It's brain-dead because cmd numbers need to be unique system-wide! |
| 492 | * The comedi driver could end up attempting to execute ioctls for non-Comedi |
| 493 | * devices because it registered the system-wide cmd code first. Similarly, |
| 494 | * another driver could end up attempting to execute ioctls for a Comedi |
| 495 | * device because it registered the cmd code first. Chaos ensues. |
| 496 | */ |
| 497 | |
| 498 | /* Handler for all 32-bit ioctl codes registered by this driver. */ |
| 499 | static int mapped_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg, |
| 500 | struct file *file) |
| 501 | { |
| 502 | int rc; |
| 503 | |
| 504 | /* Make sure we are dealing with a Comedi device. */ |
Bill Pemberton | 82675f3 | 2009-03-16 22:04:23 -0400 | [diff] [blame] | 505 | if (imajor(file->f_dentry->d_inode) != COMEDI_MAJOR) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 506 | return -ENOTTY; |
Bill Pemberton | 82675f3 | 2009-03-16 22:04:23 -0400 | [diff] [blame] | 507 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 508 | rc = raw_ioctl(file, cmd, arg); |
| 509 | /* Do not return -ENOIOCTLCMD. */ |
Bill Pemberton | 82675f3 | 2009-03-16 22:04:23 -0400 | [diff] [blame] | 510 | if (rc == -ENOIOCTLCMD) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 511 | rc = -ENOTTY; |
Bill Pemberton | 82675f3 | 2009-03-16 22:04:23 -0400 | [diff] [blame] | 512 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 513 | return rc; |
| 514 | } |
| 515 | |
| 516 | struct ioctl32_map { |
| 517 | unsigned int cmd; |
| 518 | int (*handler)(unsigned int, unsigned int, unsigned long, |
| 519 | struct file *); |
| 520 | int registered; |
| 521 | }; |
| 522 | |
| 523 | static struct ioctl32_map comedi_ioctl32_map[] = { |
| 524 | { COMEDI_DEVCONFIG, mapped_ioctl, 0 }, |
| 525 | { COMEDI_DEVINFO, mapped_ioctl, 0 }, |
| 526 | { COMEDI_SUBDINFO, mapped_ioctl, 0 }, |
| 527 | { COMEDI_BUFCONFIG, mapped_ioctl, 0 }, |
| 528 | { COMEDI_BUFINFO, mapped_ioctl, 0 }, |
| 529 | { COMEDI_LOCK, mapped_ioctl, 0 }, |
| 530 | { COMEDI_UNLOCK, mapped_ioctl, 0 }, |
| 531 | { COMEDI_CANCEL, mapped_ioctl, 0 }, |
| 532 | { COMEDI_POLL, mapped_ioctl, 0 }, |
| 533 | { COMEDI32_CHANINFO, mapped_ioctl, 0 }, |
| 534 | { COMEDI32_RANGEINFO, mapped_ioctl, 0 }, |
| 535 | { COMEDI32_CMD, mapped_ioctl, 0 }, |
| 536 | { COMEDI32_CMDTEST, mapped_ioctl, 0 }, |
| 537 | { COMEDI32_INSNLIST, mapped_ioctl, 0 }, |
| 538 | { COMEDI32_INSN, mapped_ioctl, 0 }, |
| 539 | }; |
| 540 | |
| 541 | #define NUM_IOCTL32_MAPS ARRAY_SIZE(comedi_ioctl32_map) |
| 542 | |
| 543 | /* Register system-wide 32-bit ioctl handlers. */ |
| 544 | void comedi_register_ioctl32(void) |
| 545 | { |
| 546 | int n, rc; |
| 547 | |
| 548 | for (n = 0; n < NUM_IOCTL32_MAPS; n++) { |
| 549 | rc = register_ioctl32_conversion(comedi_ioctl32_map[n].cmd, |
| 550 | comedi_ioctl32_map[n].handler); |
| 551 | if (rc) { |
| 552 | printk(KERN_WARNING |
| 553 | "comedi: failed to register 32-bit " |
| 554 | "compatible ioctl handler for 0x%X - " |
| 555 | "expect bad things to happen!\n", |
| 556 | comedi_ioctl32_map[n].cmd); |
| 557 | } |
| 558 | comedi_ioctl32_map[n].registered = !rc; |
| 559 | } |
| 560 | } |
| 561 | |
| 562 | /* Unregister system-wide 32-bit ioctl translations. */ |
| 563 | void comedi_unregister_ioctl32(void) |
| 564 | { |
| 565 | int n, rc; |
| 566 | |
| 567 | for (n = 0; n < NUM_IOCTL32_MAPS; n++) { |
| 568 | if (comedi_ioctl32_map[n].registered) { |
| 569 | rc = unregister_ioctl32_conversion( |
| 570 | comedi_ioctl32_map[n].cmd, |
| 571 | comedi_ioctl32_map[n].handler); |
| 572 | if (rc) { |
| 573 | printk(KERN_ERR |
| 574 | "comedi: failed to unregister 32-bit " |
| 575 | "compatible ioctl handler for 0x%X - " |
| 576 | "expect kernel Oops!\n", |
| 577 | comedi_ioctl32_map[n].cmd); |
| 578 | } else { |
| 579 | comedi_ioctl32_map[n].registered = 0; |
| 580 | } |
| 581 | } |
| 582 | } |
| 583 | } |
| 584 | |
| 585 | #endif /* HAVE_COMPAT_IOCTL */ |
| 586 | |
| 587 | #endif /* CONFIG_COMPAT */ |