diff options
Diffstat (limited to 'drivers/staging/comedi/comedi_compat32.c')
| -rw-r--r-- | drivers/staging/comedi/comedi_compat32.c | 597 |
1 files changed, 597 insertions, 0 deletions
diff --git a/drivers/staging/comedi/comedi_compat32.c b/drivers/staging/comedi/comedi_compat32.c new file mode 100644 index 000000000000..7d0116bcb9ff --- /dev/null +++ b/drivers/staging/comedi/comedi_compat32.c @@ -0,0 +1,597 @@ +/* + 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 "comedi.h" +#include <linux/smp_lock.h> +#include <asm/uaccess.h> + +#include "comedi_compat32.h" + +#ifdef CONFIG_COMPAT + +#ifndef HAVE_COMPAT_IOCTL +#include <linux/ioctl32.h> /* for (un)register_ioctl32_conversion */ +#endif + +#define COMEDI32_CHANINFO _IOR(CIO,3,comedi32_chaninfo) +#define COMEDI32_RANGEINFO _IOR(CIO,8,comedi32_rangeinfo) +/* 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,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) +{ + 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); +} + +/* 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; +} + +#ifdef HAVE_COMPAT_IOCTL /* defined in <linux/fs.h> 2.6.11 onwards */ + +/* 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); +} + +#else /* HAVE_COMPAT_IOCTL */ + +/* + * 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. + */ + +/* Handler for all 32-bit ioctl codes registered by this driver. */ +static int mapped_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg, + struct file *file) +{ + int rc; + + /* Make sure we are dealing with a Comedi device. */ + if (imajor(file->f_dentry->d_inode) != COMEDI_MAJOR) { + return -ENOTTY; + } + rc = raw_ioctl(file, cmd, arg); + /* Do not return -ENOIOCTLCMD. */ + if (rc == -ENOIOCTLCMD) { + rc = -ENOTTY; + } + return rc; +} + +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 */ |