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compat_ioctl.c
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compat_ioctl.c 10.83 KiB
#include <linux/blkdev.h>
#include <linux/blkpg.h>
#include <linux/blktrace_api.h>
#include <linux/cdrom.h>
#include <linux/compat.h>
#include <linux/elevator.h>
#include <linux/hdreg.h>
#include <linux/slab.h>
#include <linux/syscalls.h>
#include <linux/types.h>
#include <linux/uaccess.h>
static int compat_put_ushort(unsigned long arg, unsigned short val)
{
return put_user(val, (unsigned short __user *)compat_ptr(arg));
}
static int compat_put_int(unsigned long arg, int val)
{
return put_user(val, (compat_int_t __user *)compat_ptr(arg));
}
static int compat_put_uint(unsigned long arg, unsigned int val)
{
return put_user(val, (compat_uint_t __user *)compat_ptr(arg));
}
static int compat_put_long(unsigned long arg, long val)
{
return put_user(val, (compat_long_t __user *)compat_ptr(arg));
}
static int compat_put_ulong(unsigned long arg, compat_ulong_t val)
{
return put_user(val, (compat_ulong_t __user *)compat_ptr(arg));
}
static int compat_put_u64(unsigned long arg, u64 val)
{
return put_user(val, (compat_u64 __user *)compat_ptr(arg));
}
struct compat_hd_geometry {
unsigned char heads;
unsigned char sectors;
unsigned short cylinders;
u32 start;
};
static int compat_hdio_getgeo(struct gendisk *disk, struct block_device *bdev,
struct compat_hd_geometry __user *ugeo)
{
struct hd_geometry geo;
int ret;
if (!ugeo)
return -EINVAL;
if (!disk->fops->getgeo)
return -ENOTTY;
memset(&geo, 0, sizeof(geo));
/*
* We need to set the startsect first, the driver may
* want to override it.
*/
geo.start = get_start_sect(bdev);
ret = disk->fops->getgeo(bdev, &geo);
if (ret)
return ret;
ret = copy_to_user(ugeo, &geo, 4);
ret |= put_user(geo.start, &ugeo->start);
if (ret)
ret = -EFAULT;
return ret;
}
static int compat_hdio_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg)
{
unsigned long *__user p;
int error;
p = compat_alloc_user_space(sizeof(unsigned long));
error = __blkdev_driver_ioctl(bdev, mode,
cmd, (unsigned long)p);
if (error == 0) {
unsigned int __user *uvp = compat_ptr(arg);
unsigned long v;
if (get_user(v, p) || put_user(v, uvp))
error = -EFAULT;
}
return error;
}
struct compat_cdrom_read_audio {
union cdrom_addr addr;
u8 addr_format;
compat_int_t nframes;
compat_caddr_t buf;
};
struct compat_cdrom_generic_command {
unsigned char cmd[CDROM_PACKET_SIZE];
compat_caddr_t buffer;
compat_uint_t buflen;
compat_int_t stat;
compat_caddr_t sense;
unsigned char data_direction;
compat_int_t quiet;
compat_int_t timeout;
compat_caddr_t reserved[1];
};
static int compat_cdrom_read_audio(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg)
{
struct cdrom_read_audio __user *cdread_audio;
struct compat_cdrom_read_audio __user *cdread_audio32;
__u32 data;
void __user *datap;
cdread_audio = compat_alloc_user_space(sizeof(*cdread_audio));
cdread_audio32 = compat_ptr(arg);
if (copy_in_user(&cdread_audio->addr,
&cdread_audio32->addr,
(sizeof(*cdread_audio32) -
sizeof(compat_caddr_t))))
return -EFAULT;
if (get_user(data, &cdread_audio32->buf))
return -EFAULT;
datap = compat_ptr(data);
if (put_user(datap, &cdread_audio->buf))
return -EFAULT;
return __blkdev_driver_ioctl(bdev, mode, cmd,
(unsigned long)cdread_audio);}
static int compat_cdrom_generic_command(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg)
{
struct cdrom_generic_command __user *cgc;
struct compat_cdrom_generic_command __user *cgc32;
u32 data;
unsigned char dir;
int itmp;
cgc = compat_alloc_user_space(sizeof(*cgc));
cgc32 = compat_ptr(arg);
if (copy_in_user(&cgc->cmd, &cgc32->cmd, sizeof(cgc->cmd)) ||
get_user(data, &cgc32->buffer) ||
put_user(compat_ptr(data), &cgc->buffer) ||
copy_in_user(&cgc->buflen, &cgc32->buflen,
(sizeof(unsigned int) + sizeof(int))) ||
get_user(data, &cgc32->sense) ||
put_user(compat_ptr(data), &cgc->sense) ||
get_user(dir, &cgc32->data_direction) ||
put_user(dir, &cgc->data_direction) ||
get_user(itmp, &cgc32->quiet) ||
put_user(itmp, &cgc->quiet) ||
get_user(itmp, &cgc32->timeout) ||
put_user(itmp, &cgc->timeout) ||
get_user(data, &cgc32->reserved[0]) ||
put_user(compat_ptr(data), &cgc->reserved[0]))
return -EFAULT;
return __blkdev_driver_ioctl(bdev, mode, cmd, (unsigned long)cgc);
}
struct compat_blkpg_ioctl_arg {
compat_int_t op;
compat_int_t flags;
compat_int_t datalen;
compat_caddr_t data;
};
static int compat_blkpg_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, struct compat_blkpg_ioctl_arg __user *ua32)
{
struct blkpg_ioctl_arg __user *a = compat_alloc_user_space(sizeof(*a));
compat_caddr_t udata;
compat_int_t n;
int err;
err = get_user(n, &ua32->op);
err |= put_user(n, &a->op);
err |= get_user(n, &ua32->flags);
err |= put_user(n, &a->flags);
err |= get_user(n, &ua32->datalen);
err |= put_user(n, &a->datalen);
err |= get_user(udata, &ua32->data);
err |= put_user(compat_ptr(udata), &a->data);
if (err)
return err;
return blkdev_ioctl(bdev, mode, cmd, (unsigned long)a);
}
#define BLKBSZGET_32 _IOR(0x12, 112, int)
#define BLKBSZSET_32 _IOW(0x12, 113, int)
#define BLKGETSIZE64_32 _IOR(0x12, 114, int)
static int compat_blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
unsigned cmd, unsigned long arg)
{ switch (cmd) {
case HDIO_GET_UNMASKINTR:
case HDIO_GET_MULTCOUNT:
case HDIO_GET_KEEPSETTINGS:
case HDIO_GET_32BIT:
case HDIO_GET_NOWERR:
case HDIO_GET_DMA:
case HDIO_GET_NICE:
case HDIO_GET_WCACHE:
case HDIO_GET_ACOUSTIC:
case HDIO_GET_ADDRESS:
case HDIO_GET_BUSSTATE:
return compat_hdio_ioctl(bdev, mode, cmd, arg);
case CDROMREADAUDIO:
return compat_cdrom_read_audio(bdev, mode, cmd, arg);
case CDROM_SEND_PACKET:
return compat_cdrom_generic_command(bdev, mode, cmd, arg);
/*
* No handler required for the ones below, we just need to
* convert arg to a 64 bit pointer.
*/
case BLKSECTSET:
/*
* 0x03 -- HD/IDE ioctl's used by hdparm and friends.
* Some need translations, these do not.
*/
case HDIO_GET_IDENTITY:
case HDIO_DRIVE_TASK:
case HDIO_DRIVE_CMD:
/* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */
case 0x330:
/* CDROM stuff */
case CDROMPAUSE:
case CDROMRESUME:
case CDROMPLAYMSF:
case CDROMPLAYTRKIND:
case CDROMREADTOCHDR:
case CDROMREADTOCENTRY:
case CDROMSTOP:
case CDROMSTART:
case CDROMEJECT:
case CDROMVOLCTRL:
case CDROMSUBCHNL:
case CDROMMULTISESSION:
case CDROM_GET_MCN:
case CDROMRESET:
case CDROMVOLREAD:
case CDROMSEEK:
case CDROMPLAYBLK:
case CDROMCLOSETRAY:
case CDROM_DISC_STATUS:
case CDROM_CHANGER_NSLOTS:
case CDROM_GET_CAPABILITY:
/* Ignore cdrom.h about these next 5 ioctls, they absolutely do
* not take a struct cdrom_read, instead they take a struct cdrom_msf
* which is compatible.
*/
case CDROMREADMODE2:
case CDROMREADMODE1:
case CDROMREADRAW:
case CDROMREADCOOKED:
case CDROMREADALL:
/* DVD ioctls */
case DVD_READ_STRUCT:
case DVD_WRITE_STRUCT:
case DVD_AUTH:
arg = (unsigned long)compat_ptr(arg);
/* These intepret arg as an unsigned long, not as a pointer,
* so we must not do compat_ptr() conversion. */ case HDIO_SET_MULTCOUNT:
case HDIO_SET_UNMASKINTR:
case HDIO_SET_KEEPSETTINGS:
case HDIO_SET_32BIT:
case HDIO_SET_NOWERR:
case HDIO_SET_DMA:
case HDIO_SET_PIO_MODE:
case HDIO_SET_NICE:
case HDIO_SET_WCACHE:
case HDIO_SET_ACOUSTIC:
case HDIO_SET_BUSSTATE:
case HDIO_SET_ADDRESS:
case CDROMEJECT_SW:
case CDROM_SET_OPTIONS:
case CDROM_CLEAR_OPTIONS:
case CDROM_SELECT_SPEED:
case CDROM_SELECT_DISC:
case CDROM_MEDIA_CHANGED:
case CDROM_DRIVE_STATUS:
case CDROM_LOCKDOOR:
case CDROM_DEBUG:
break;
default:
/* unknown ioctl number */
return -ENOIOCTLCMD;
}
return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
}
/* Most of the generic ioctls are handled in the normal fallback path.
This assumes the blkdev's low level compat_ioctl always returns
ENOIOCTLCMD for unknown ioctls. */
long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
{
int ret = -ENOIOCTLCMD;
struct inode *inode = file->f_mapping->host;
struct block_device *bdev = inode->i_bdev;
struct gendisk *disk = bdev->bd_disk;
fmode_t mode = file->f_mode;
loff_t size;
unsigned int max_sectors;
/*
* O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
* to updated it before every ioctl.
*/
if (file->f_flags & O_NDELAY)
mode |= FMODE_NDELAY;
else
mode &= ~FMODE_NDELAY;
switch (cmd) {
case HDIO_GETGEO:
return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
case BLKPBSZGET:
return compat_put_uint(arg, bdev_physical_block_size(bdev));
case BLKIOMIN:
return compat_put_uint(arg, bdev_io_min(bdev));
case BLKIOOPT:
return compat_put_uint(arg, bdev_io_opt(bdev));
case BLKALIGNOFF:
return compat_put_int(arg, bdev_alignment_offset(bdev));
case BLKDISCARDZEROES:
return compat_put_uint(arg, 0);
case BLKFLSBUF:
case BLKROSET:
case BLKDISCARD:
case BLKSECDISCARD:
case BLKZEROOUT: /*
* the ones below are implemented in blkdev_locked_ioctl,
* but we call blkdev_ioctl, which gets the lock for us
*/
case BLKRRPART:
return blkdev_ioctl(bdev, mode, cmd,
(unsigned long)compat_ptr(arg));
case BLKBSZSET_32:
return blkdev_ioctl(bdev, mode, BLKBSZSET,
(unsigned long)compat_ptr(arg));
case BLKPG:
return compat_blkpg_ioctl(bdev, mode, cmd, compat_ptr(arg));
case BLKRAGET:
case BLKFRAGET:
if (!arg)
return -EINVAL;
return compat_put_long(arg,
(bdev->bd_bdi->ra_pages * PAGE_SIZE) / 512);
case BLKROGET: /* compatible */
return compat_put_int(arg, bdev_read_only(bdev) != 0);
case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
return compat_put_int(arg, block_size(bdev));
case BLKSSZGET: /* get block device hardware sector size */
return compat_put_int(arg, bdev_logical_block_size(bdev));
case BLKSECTGET:
max_sectors = min_t(unsigned int, USHRT_MAX,
queue_max_sectors(bdev_get_queue(bdev)));
return compat_put_ushort(arg, max_sectors);
case BLKROTATIONAL:
return compat_put_ushort(arg,
!blk_queue_nonrot(bdev_get_queue(bdev)));
case BLKRASET: /* compatible, but no compat_ptr (!) */
case BLKFRASET:
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE;
return 0;
case BLKGETSIZE:
size = i_size_read(bdev->bd_inode);
if ((size >> 9) > ~0UL)
return -EFBIG;
return compat_put_ulong(arg, size >> 9);
case BLKGETSIZE64_32:
return compat_put_u64(arg, i_size_read(bdev->bd_inode));
case BLKTRACESETUP32:
case BLKTRACESTART: /* compatible */
case BLKTRACESTOP: /* compatible */
case BLKTRACETEARDOWN: /* compatible */
ret = blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
return ret;
default:
if (disk->fops->compat_ioctl)
ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
if (ret == -ENOIOCTLCMD)
ret = compat_blkdev_driver_ioctl(bdev, mode, cmd, arg);
return ret;
}
}