Release 4.12 block/compat_ioctl.c

#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/fd.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));
}

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static int compat_put_int(unsigned long arg, int val)
{
	return put_user(val, (compat_int_t __user *)compat_ptr(arg));
}

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static int compat_put_uint(unsigned long arg, unsigned int val)
{
	return put_user(val, (compat_uint_t __user *)compat_ptr(arg));
}

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static int compat_put_long(unsigned long arg, long val)
{
	return put_user(val, (compat_long_t __user *)compat_ptr(arg));
}

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static int compat_put_ulong(unsigned long arg, compat_ulong_t val)
{
	return put_user(val, (compat_ulong_t __user *)compat_ptr(arg));
}

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static int compat_put_u64(unsigned long arg, u64 val)
{
	return put_user(val, (compat_u64 __user *)compat_ptr(arg));
}

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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;
}

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static int compat_hdio_ioctl(struct block_device *bdev, fmode_t mode,
		unsigned int cmd, unsigned long arg)
{
	mm_segment_t old_fs = get_fs();
	unsigned long kval;
	unsigned int __user *uvp;
	int error;

	set_fs(KERNEL_DS);
	error = __blkdev_driver_ioctl(bdev, mode,
				cmd, (unsigned long)(&kval));
	set_fs(old_fs);

	if (error == 0) {
		uvp = compat_ptr(arg);
		if (put_user(kval, uvp))
			error = -EFAULT;
	}
	return error;
}

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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);
}

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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);
}

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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);
}

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#define BLKBSZGET_32		_IOR(0x12, 112, int)

#define BLKBSZSET_32		_IOW(0x12, 113, int)

#define BLKGETSIZE64_32		_IOR(0x12, 114, int)


struct compat_floppy_drive_params {
	
char		cmos;
	
compat_ulong_t	max_dtr;
	
compat_ulong_t	hlt;
	
compat_ulong_t	hut;
	
compat_ulong_t	srt;
	
compat_ulong_t	spinup;
	
compat_ulong_t	spindown;
	
unsigned char	spindown_offset;
	
unsigned char	select_delay;
	
unsigned char	rps;
	
unsigned char	tracks;
	
compat_ulong_t	timeout;
	
unsigned char	interleave_sect;
	
struct floppy_max_errors max_errors;
	
char		flags;
	
char		read_track;
	
short		autodetect[8];
	
compat_int_t	checkfreq;
	
compat_int_t	native_format;
};


struct compat_floppy_drive_struct {
	
signed char	flags;
	
compat_ulong_t	spinup_date;
	
compat_ulong_t	select_date;
	
compat_ulong_t	first_read_date;
	
short		probed_format;
	
short		track;
	
short		maxblock;
	
short		maxtrack;
	
compat_int_t	generation;
	
compat_int_t	keep_data;
	
compat_int_t	fd_ref;
	
compat_int_t	fd_device;
	
compat_int_t	last_checked;
	
compat_caddr_t dmabuf;
	
compat_int_t	bufblocks;
};


struct compat_floppy_fdc_state {
	
compat_int_t	spec1;
	
compat_int_t	spec2;
	
compat_int_t	dtr;
	
unsigned char	version;
	
unsigned char	dor;
	
compat_ulong_t	address;
	
unsigned int	rawcmd:2;
	
unsigned int	reset:1;
	
unsigned int	need_configure:1;
	
unsigned int	perp_mode:2;
	
unsigned int	has_fifo:1;
	
unsigned int	driver_version;
	
unsigned char	track[4];
};


struct compat_floppy_write_errors {
	
unsigned int	write_errors;
	
compat_ulong_t	first_error_sector;
	
compat_int_t	first_error_generation;
	
compat_ulong_t	last_error_sector;
	
compat_int_t	last_error_generation;
	
compat_uint_t	badness;
};


#define FDSETPRM32 _IOW(2, 0x42, struct compat_floppy_struct)

#define FDDEFPRM32 _IOW(2, 0x43, struct compat_floppy_struct)

#define FDSETDRVPRM32 _IOW(2, 0x90, struct compat_floppy_drive_params)

#define FDGETDRVPRM32 _IOR(2, 0x11, struct compat_floppy_drive_params)

#define FDGETDRVSTAT32 _IOR(2, 0x12, struct compat_floppy_drive_struct)

#define FDPOLLDRVSTAT32 _IOR(2, 0x13, struct compat_floppy_drive_struct)

#define FDGETFDCSTAT32 _IOR(2, 0x15, struct compat_floppy_fdc_state)

#define FDWERRORGET32  _IOR(2, 0x17, struct compat_floppy_write_errors)

static struct {
	
unsigned int	cmd32;
	
unsigned int	cmd;

} fd_ioctl_trans_table[] = {
	{ FDSETPRM32, FDSETPRM },
	{ FDDEFPRM32, FDDEFPRM },
	{ FDGETPRM32, FDGETPRM },
	{ FDSETDRVPRM32, FDSETDRVPRM },
	{ FDGETDRVPRM32, FDGETDRVPRM },
	{ FDGETDRVSTAT32, FDGETDRVSTAT },
	{ FDPOLLDRVSTAT32, FDPOLLDRVSTAT },
	{ FDGETFDCSTAT32, FDGETFDCSTAT },
	{ FDWERRORGET32, FDWERRORGET }
};


#define NR_FD_IOCTL_TRANS ARRAY_SIZE(fd_ioctl_trans_table)



static int compat_fd_ioctl(struct block_device *bdev, fmode_t mode,
		unsigned int cmd, unsigned long arg)
{
	mm_segment_t old_fs = get_fs();
	void *karg = NULL;
	unsigned int kcmd = 0;
	int i, err;

	for (i = 0; i < NR_FD_IOCTL_TRANS; i++)
		if (cmd == fd_ioctl_trans_table[i].cmd32) {
			kcmd = fd_ioctl_trans_table[i].cmd;
			break;
		}
	if (!kcmd)
		return -EINVAL;

	switch (cmd) {
	case FDSETPRM32:
	case FDDEFPRM32:
	case FDGETPRM32:
	{
		compat_uptr_t name;
		struct compat_floppy_struct __user *uf;
		struct floppy_struct *f;

		uf = compat_ptr(arg);
		f = karg = kmalloc(sizeof(struct floppy_struct), GFP_KERNEL);
		if (!karg)
			return -ENOMEM;
		if (cmd == FDGETPRM32)
			break;
		err = __get_user(f->size, &uf->size);
		err |= __get_user(f->sect, &uf->sect);
		err |= __get_user(f->head, &uf->head);
		err |= __get_user(f->track, &uf->track);
		err |= __get_user(f->stretch, &uf->stretch);
		err |= __get_user(f->gap, &uf->gap);
		err |= __get_user(f->rate, &uf->rate);
		err |= __get_user(f->spec1, &uf->spec1);
		err |= __get_user(f->fmt_gap, &uf->fmt_gap);
		err |= __get_user(name, &uf->name);
		f->name = compat_ptr(name);
		if (err) {
			err = -EFAULT;
			goto out;
		}
		break;
	}
	case FDSETDRVPRM32:
	case FDGETDRVPRM32:
	{
		struct compat_floppy_drive_params __user *uf;
		struct floppy_drive_params *f;

		uf = compat_ptr(arg);
		f = karg = kmalloc(sizeof(struct floppy_drive_params), GFP_KERNEL);
		if (!karg)
			return -ENOMEM;
		if (cmd == FDGETDRVPRM32)
			break;
		err = __get_user(f->cmos, &uf->cmos);
		err |= __get_user(f->max_dtr, &uf->max_dtr);
		err |= __get_user(f->hlt, &uf->hlt);
		err |= __get_user(f->hut, &uf->hut);
		err |= __get_user(f->srt, &uf->srt);
		err |= __get_user(f->spinup, &uf->spinup);
		err |= __get_user(f->spindown, &uf->spindown);
		err |= __get_user(f->spindown_offset, &uf->spindown_offset);
		err |= __get_user(f->select_delay, &uf->select_delay);
		err |= __get_user(f->rps, &uf->rps);
		err |= __get_user(f->tracks, &uf->tracks);
		err |= __get_user(f->timeout, &uf->timeout);
		err |= __get_user(f->interleave_sect, &uf->interleave_sect);
		err |= __copy_from_user(&f->max_errors, &uf->max_errors, sizeof(f->max_errors));
		err |= __get_user(f->flags, &uf->flags);
		err |= __get_user(f->read_track, &uf->read_track);
		err |= __copy_from_user(f->autodetect, uf->autodetect, sizeof(f->autodetect));
		err |= __get_user(f->checkfreq, &uf->checkfreq);
		err |= __get_user(f->native_format, &uf->native_format);
		if (err) {
			err = -EFAULT;
			goto out;
		}
		break;
	}
	case FDGETDRVSTAT32:
	case FDPOLLDRVSTAT32:
		karg = kmalloc(sizeof(struct floppy_drive_struct), GFP_KERNEL);
		if (!karg)
			return -ENOMEM;
		break;
	case FDGETFDCSTAT32:
		karg = kmalloc(sizeof(struct floppy_fdc_state), GFP_KERNEL);
		if (!karg)
			return -ENOMEM;
		break;
	case FDWERRORGET32:
		karg = kmalloc(sizeof(struct floppy_write_errors), GFP_KERNEL);
		if (!karg)
			return -ENOMEM;
		break;
	default:
		return -EINVAL;
	}
	set_fs(KERNEL_DS);
	err = __blkdev_driver_ioctl(bdev, mode, kcmd, (unsigned long)karg);
	set_fs(old_fs);
	if (err)
		goto out;
	switch (cmd) {
	case FDGETPRM32:
	{
		struct floppy_struct *f = karg;
		struct compat_floppy_struct __user *uf = compat_ptr(arg);

		err = __put_user(f->size, &uf->size);
		err |= __put_user(f->sect, &uf->sect);
		err |= __put_user(f->head, &uf->head);
		err |= __put_user(f->track, &uf->track);
		err |= __put_user(f->stretch, &uf->stretch);
		err |= __put_user(f->gap, &uf->gap);
		err |= __put_user(f->rate, &uf->rate);
		err |= __put_user(f->spec1, &uf->spec1);
		err |= __put_user(f->fmt_gap, &uf->fmt_gap);
		err |= __put_user((u64)f->name, (compat_caddr_t __user *)&uf->name);
		break;
	}
	case FDGETDRVPRM32:
	{
		struct compat_floppy_drive_params __user *uf;
		struct floppy_drive_params *f = karg;

		uf = compat_ptr(arg);
		err = __put_user(f->cmos, &uf->cmos);
		err |= __put_user(f->max_dtr, &uf->max_dtr);
		err |= __put_user(f->hlt, &uf->hlt);
		err |= __put_user(f->hut, &uf->hut);
		err |= __put_user(f->srt, &uf->srt);
		err |= __put_user(f->spinup, &uf->spinup);
		err |= __put_user(f->spindown, &uf->spindown);
		err |= __put_user(f->spindown_offset, &uf->spindown_offset);
		err |= __put_user(f->select_delay, &uf->select_delay);
		err |= __put_user(f->rps, &uf->rps);
		err |= __put_user(f->tracks, &uf->tracks);
		err |= __put_user(f->timeout, &uf->timeout);
		err |= __put_user(f->interleave_sect, &uf->interleave_sect);
		err |= __copy_to_user(&uf->max_errors, &f->max_errors, sizeof(f->max_errors));
		err |= __put_user(f->flags, &uf->flags);
		err |= __put_user(f->read_track, &uf->read_track);
		err |= __copy_to_user(uf->autodetect, f->autodetect, sizeof(f->autodetect));
		err |= __put_user(f->checkfreq, &uf->checkfreq);
		err |= __put_user(