diff options
Diffstat (limited to 'drivers/staging/comedi/comedi_compat32.c')
| -rw-r--r-- | drivers/staging/comedi/comedi_compat32.c | 460 |
1 files changed, 460 insertions, 0 deletions
diff --git a/drivers/staging/comedi/comedi_compat32.c b/drivers/staging/comedi/comedi_compat32.c new file mode 100644 index 00000000..ad208cdd --- /dev/null +++ b/drivers/staging/comedi/comedi_compat32.c @@ -0,0 +1,460 @@ +/* + 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. + +*/ + +#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) + return -ENOTTY; + + 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(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, 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) +{ + struct comedi_cmd __user *cmd; + struct comedi32_cmd_struct __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) +{ + 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); +} + +/* Process untranslated ioctl. */ +/* Returns -ENOIOCTLCMD for unrecognised ioctl codes. */ +static inline int raw_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; +} + +/* compat_ioctl file operation. */ +/* Returns -ENOIOCTLCMD for unrecognised ioctl codes. */ +long comedi_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + return raw_ioctl(file, cmd, arg); +} |