412 lines
11 KiB
C
412 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/blkdev.h>
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#include <linux/blkpg.h>
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#include <linux/blktrace_api.h>
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#include <linux/cdrom.h>
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#include <linux/compat.h>
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#include <linux/elevator.h>
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#include <linux/hdreg.h>
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#include <linux/slab.h>
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#include <linux/syscalls.h>
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#include <linux/types.h>
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#include <linux/uaccess.h>
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static int compat_put_ushort(unsigned long arg, unsigned short val)
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{
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return put_user(val, (unsigned short __user *)compat_ptr(arg));
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}
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static int compat_put_int(unsigned long arg, int val)
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{
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return put_user(val, (compat_int_t __user *)compat_ptr(arg));
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}
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static int compat_put_uint(unsigned long arg, unsigned int val)
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{
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return put_user(val, (compat_uint_t __user *)compat_ptr(arg));
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}
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static int compat_put_long(unsigned long arg, long val)
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{
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return put_user(val, (compat_long_t __user *)compat_ptr(arg));
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}
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static int compat_put_ulong(unsigned long arg, compat_ulong_t val)
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{
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return put_user(val, (compat_ulong_t __user *)compat_ptr(arg));
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}
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static int compat_put_u64(unsigned long arg, u64 val)
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{
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return put_user(val, (compat_u64 __user *)compat_ptr(arg));
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}
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struct compat_hd_geometry {
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unsigned char heads;
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unsigned char sectors;
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unsigned short cylinders;
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u32 start;
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};
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static int compat_hdio_getgeo(struct gendisk *disk, struct block_device *bdev,
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struct compat_hd_geometry __user *ugeo)
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{
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struct hd_geometry geo;
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int ret;
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if (!ugeo)
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return -EINVAL;
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if (!disk->fops->getgeo)
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return -ENOTTY;
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memset(&geo, 0, sizeof(geo));
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/*
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* We need to set the startsect first, the driver may
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* want to override it.
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*/
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geo.start = get_start_sect(bdev);
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ret = disk->fops->getgeo(bdev, &geo);
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if (ret)
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return ret;
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ret = copy_to_user(ugeo, &geo, 4);
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ret |= put_user(geo.start, &ugeo->start);
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if (ret)
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ret = -EFAULT;
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return ret;
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}
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static int compat_hdio_ioctl(struct block_device *bdev, fmode_t mode,
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unsigned int cmd, unsigned long arg)
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{
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unsigned long __user *p;
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int error;
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p = compat_alloc_user_space(sizeof(unsigned long));
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error = __blkdev_driver_ioctl(bdev, mode,
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cmd, (unsigned long)p);
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if (error == 0) {
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unsigned int __user *uvp = compat_ptr(arg);
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unsigned long v;
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if (get_user(v, p) || put_user(v, uvp))
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error = -EFAULT;
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}
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return error;
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}
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struct compat_cdrom_read_audio {
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union cdrom_addr addr;
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u8 addr_format;
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compat_int_t nframes;
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compat_caddr_t buf;
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};
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struct compat_cdrom_generic_command {
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unsigned char cmd[CDROM_PACKET_SIZE];
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compat_caddr_t buffer;
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compat_uint_t buflen;
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compat_int_t stat;
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compat_caddr_t sense;
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unsigned char data_direction;
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compat_int_t quiet;
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compat_int_t timeout;
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compat_caddr_t reserved[1];
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};
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static int compat_cdrom_read_audio(struct block_device *bdev, fmode_t mode,
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unsigned int cmd, unsigned long arg)
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{
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struct cdrom_read_audio __user *cdread_audio;
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struct compat_cdrom_read_audio __user *cdread_audio32;
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__u32 data;
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void __user *datap;
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cdread_audio = compat_alloc_user_space(sizeof(*cdread_audio));
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cdread_audio32 = compat_ptr(arg);
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if (copy_in_user(&cdread_audio->addr,
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&cdread_audio32->addr,
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(sizeof(*cdread_audio32) -
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sizeof(compat_caddr_t))))
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return -EFAULT;
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if (get_user(data, &cdread_audio32->buf))
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return -EFAULT;
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datap = compat_ptr(data);
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if (put_user(datap, &cdread_audio->buf))
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return -EFAULT;
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return __blkdev_driver_ioctl(bdev, mode, cmd,
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(unsigned long)cdread_audio);
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}
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static int compat_cdrom_generic_command(struct block_device *bdev, fmode_t mode,
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unsigned int cmd, unsigned long arg)
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{
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struct cdrom_generic_command __user *cgc;
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struct compat_cdrom_generic_command __user *cgc32;
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u32 data;
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unsigned char dir;
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int itmp;
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cgc = compat_alloc_user_space(sizeof(*cgc));
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cgc32 = compat_ptr(arg);
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if (copy_in_user(&cgc->cmd, &cgc32->cmd, sizeof(cgc->cmd)) ||
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get_user(data, &cgc32->buffer) ||
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put_user(compat_ptr(data), &cgc->buffer) ||
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copy_in_user(&cgc->buflen, &cgc32->buflen,
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(sizeof(unsigned int) + sizeof(int))) ||
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get_user(data, &cgc32->sense) ||
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put_user(compat_ptr(data), &cgc->sense) ||
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get_user(dir, &cgc32->data_direction) ||
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put_user(dir, &cgc->data_direction) ||
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get_user(itmp, &cgc32->quiet) ||
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put_user(itmp, &cgc->quiet) ||
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get_user(itmp, &cgc32->timeout) ||
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put_user(itmp, &cgc->timeout) ||
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get_user(data, &cgc32->reserved[0]) ||
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put_user(compat_ptr(data), &cgc->reserved[0]))
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return -EFAULT;
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return __blkdev_driver_ioctl(bdev, mode, cmd, (unsigned long)cgc);
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}
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struct compat_blkpg_ioctl_arg {
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compat_int_t op;
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compat_int_t flags;
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compat_int_t datalen;
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compat_caddr_t data;
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};
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static int compat_blkpg_ioctl(struct block_device *bdev, fmode_t mode,
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unsigned int cmd, struct compat_blkpg_ioctl_arg __user *ua32)
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{
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struct blkpg_ioctl_arg __user *a = compat_alloc_user_space(sizeof(*a));
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compat_caddr_t udata;
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compat_int_t n;
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int err;
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err = get_user(n, &ua32->op);
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err |= put_user(n, &a->op);
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err |= get_user(n, &ua32->flags);
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err |= put_user(n, &a->flags);
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err |= get_user(n, &ua32->datalen);
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err |= put_user(n, &a->datalen);
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err |= get_user(udata, &ua32->data);
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err |= put_user(compat_ptr(udata), &a->data);
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if (err)
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return err;
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return blkdev_ioctl(bdev, mode, cmd, (unsigned long)a);
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}
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#define BLKBSZGET_32 _IOR(0x12, 112, int)
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#define BLKBSZSET_32 _IOW(0x12, 113, int)
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#define BLKGETSIZE64_32 _IOR(0x12, 114, int)
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static int compat_blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
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unsigned cmd, unsigned long arg)
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{
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switch (cmd) {
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case HDIO_GET_UNMASKINTR:
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case HDIO_GET_MULTCOUNT:
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case HDIO_GET_KEEPSETTINGS:
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case HDIO_GET_32BIT:
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case HDIO_GET_NOWERR:
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case HDIO_GET_DMA:
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case HDIO_GET_NICE:
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case HDIO_GET_WCACHE:
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case HDIO_GET_ACOUSTIC:
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case HDIO_GET_ADDRESS:
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case HDIO_GET_BUSSTATE:
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return compat_hdio_ioctl(bdev, mode, cmd, arg);
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case CDROMREADAUDIO:
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return compat_cdrom_read_audio(bdev, mode, cmd, arg);
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case CDROM_SEND_PACKET:
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return compat_cdrom_generic_command(bdev, mode, cmd, arg);
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/*
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* No handler required for the ones below, we just need to
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* convert arg to a 64 bit pointer.
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*/
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case BLKSECTSET:
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/*
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* 0x03 -- HD/IDE ioctl's used by hdparm and friends.
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* Some need translations, these do not.
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*/
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case HDIO_GET_IDENTITY:
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case HDIO_DRIVE_TASK:
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case HDIO_DRIVE_CMD:
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/* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */
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case 0x330:
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/* CDROM stuff */
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case CDROMPAUSE:
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case CDROMRESUME:
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case CDROMPLAYMSF:
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case CDROMPLAYTRKIND:
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case CDROMREADTOCHDR:
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case CDROMREADTOCENTRY:
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case CDROMSTOP:
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case CDROMSTART:
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case CDROMEJECT:
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case CDROMVOLCTRL:
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case CDROMSUBCHNL:
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case CDROMMULTISESSION:
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case CDROM_GET_MCN:
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case CDROMRESET:
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case CDROMVOLREAD:
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case CDROMSEEK:
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case CDROMPLAYBLK:
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case CDROMCLOSETRAY:
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case CDROM_DISC_STATUS:
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case CDROM_CHANGER_NSLOTS:
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case CDROM_GET_CAPABILITY:
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/* Ignore cdrom.h about these next 5 ioctls, they absolutely do
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* not take a struct cdrom_read, instead they take a struct cdrom_msf
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* which is compatible.
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*/
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case CDROMREADMODE2:
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case CDROMREADMODE1:
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case CDROMREADRAW:
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case CDROMREADCOOKED:
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case CDROMREADALL:
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/* DVD ioctls */
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case DVD_READ_STRUCT:
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case DVD_WRITE_STRUCT:
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case DVD_AUTH:
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arg = (unsigned long)compat_ptr(arg);
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/* These intepret arg as an unsigned long, not as a pointer,
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* so we must not do compat_ptr() conversion. */
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case HDIO_SET_MULTCOUNT:
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case HDIO_SET_UNMASKINTR:
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case HDIO_SET_KEEPSETTINGS:
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case HDIO_SET_32BIT:
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case HDIO_SET_NOWERR:
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case HDIO_SET_DMA:
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case HDIO_SET_PIO_MODE:
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case HDIO_SET_NICE:
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case HDIO_SET_WCACHE:
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case HDIO_SET_ACOUSTIC:
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case HDIO_SET_BUSSTATE:
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case HDIO_SET_ADDRESS:
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case CDROMEJECT_SW:
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case CDROM_SET_OPTIONS:
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case CDROM_CLEAR_OPTIONS:
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case CDROM_SELECT_SPEED:
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case CDROM_SELECT_DISC:
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case CDROM_MEDIA_CHANGED:
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case CDROM_DRIVE_STATUS:
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case CDROM_LOCKDOOR:
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case CDROM_DEBUG:
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break;
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default:
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/* unknown ioctl number */
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return -ENOIOCTLCMD;
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}
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return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
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}
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/* Most of the generic ioctls are handled in the normal fallback path.
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This assumes the blkdev's low level compat_ioctl always returns
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ENOIOCTLCMD for unknown ioctls. */
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long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
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{
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int ret = -ENOIOCTLCMD;
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struct inode *inode = file->f_mapping->host;
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struct block_device *bdev = inode->i_bdev;
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struct gendisk *disk = bdev->bd_disk;
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fmode_t mode = file->f_mode;
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loff_t size;
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unsigned int max_sectors;
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/*
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* O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
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* to updated it before every ioctl.
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*/
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if (file->f_flags & O_NDELAY)
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mode |= FMODE_NDELAY;
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else
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mode &= ~FMODE_NDELAY;
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switch (cmd) {
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case HDIO_GETGEO:
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return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
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case BLKPBSZGET:
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return compat_put_uint(arg, bdev_physical_block_size(bdev));
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case BLKIOMIN:
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return compat_put_uint(arg, bdev_io_min(bdev));
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case BLKIOOPT:
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return compat_put_uint(arg, bdev_io_opt(bdev));
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case BLKALIGNOFF:
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return compat_put_int(arg, bdev_alignment_offset(bdev));
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case BLKDISCARDZEROES:
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return compat_put_uint(arg, 0);
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case BLKFLSBUF:
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case BLKROSET:
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case BLKDISCARD:
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case BLKSECDISCARD:
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case BLKZEROOUT:
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/*
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* the ones below are implemented in blkdev_locked_ioctl,
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* but we call blkdev_ioctl, which gets the lock for us
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*/
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case BLKRRPART:
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return blkdev_ioctl(bdev, mode, cmd,
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(unsigned long)compat_ptr(arg));
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case BLKBSZSET_32:
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return blkdev_ioctl(bdev, mode, BLKBSZSET,
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(unsigned long)compat_ptr(arg));
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case BLKPG:
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return compat_blkpg_ioctl(bdev, mode, cmd, compat_ptr(arg));
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case BLKRAGET:
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case BLKFRAGET:
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if (!arg)
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return -EINVAL;
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return compat_put_long(arg,
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(bdev->bd_bdi->ra_pages * PAGE_SIZE) / 512);
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case BLKROGET: /* compatible */
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return compat_put_int(arg, bdev_read_only(bdev) != 0);
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case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
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return compat_put_int(arg, block_size(bdev));
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case BLKSSZGET: /* get block device hardware sector size */
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return compat_put_int(arg, bdev_logical_block_size(bdev));
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case BLKSECTGET:
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max_sectors = min_t(unsigned int, USHRT_MAX,
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queue_max_sectors(bdev_get_queue(bdev)));
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return compat_put_ushort(arg, max_sectors);
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case BLKROTATIONAL:
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return compat_put_ushort(arg,
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!blk_queue_nonrot(bdev_get_queue(bdev)));
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case BLKRASET: /* compatible, but no compat_ptr (!) */
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case BLKFRASET:
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE;
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return 0;
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case BLKGETSIZE:
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size = i_size_read(bdev->bd_inode);
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if ((size >> 9) > ~0UL)
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return -EFBIG;
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return compat_put_ulong(arg, size >> 9);
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case BLKGETSIZE64_32:
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return compat_put_u64(arg, i_size_read(bdev->bd_inode));
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case BLKTRACESETUP32:
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case BLKTRACESTART: /* compatible */
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case BLKTRACESTOP: /* compatible */
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case BLKTRACETEARDOWN: /* compatible */
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ret = blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
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return ret;
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default:
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if (disk->fops->compat_ioctl)
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ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
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if (ret == -ENOIOCTLCMD)
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ret = compat_blkdev_driver_ioctl(bdev, mode, cmd, arg);
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return ret;
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}
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}
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