1 #include <linux/blkdev.h>
2 #include <linux/blkpg.h>
3 #include <linux/blktrace_api.h>
4 #include <linux/cdrom.h>
5 #include <linux/compat.h>
6 #include <linux/elevator.h>
7 #include <linux/hdreg.h>
8 #include <linux/pr.h>
9 #include <linux/slab.h>
10 #include <linux/syscalls.h>
11 #include <linux/types.h>
12 #include <linux/uaccess.h>
13
compat_put_ushort(unsigned long arg,unsigned short val)14 static int compat_put_ushort(unsigned long arg, unsigned short val)
15 {
16 return put_user(val, (unsigned short __user *)compat_ptr(arg));
17 }
18
compat_put_int(unsigned long arg,int val)19 static int compat_put_int(unsigned long arg, int val)
20 {
21 return put_user(val, (compat_int_t __user *)compat_ptr(arg));
22 }
23
compat_put_uint(unsigned long arg,unsigned int val)24 static int compat_put_uint(unsigned long arg, unsigned int val)
25 {
26 return put_user(val, (compat_uint_t __user *)compat_ptr(arg));
27 }
28
compat_put_long(unsigned long arg,long val)29 static int compat_put_long(unsigned long arg, long val)
30 {
31 return put_user(val, (compat_long_t __user *)compat_ptr(arg));
32 }
33
compat_put_ulong(unsigned long arg,compat_ulong_t val)34 static int compat_put_ulong(unsigned long arg, compat_ulong_t val)
35 {
36 return put_user(val, (compat_ulong_t __user *)compat_ptr(arg));
37 }
38
compat_put_u64(unsigned long arg,u64 val)39 static int compat_put_u64(unsigned long arg, u64 val)
40 {
41 return put_user(val, (compat_u64 __user *)compat_ptr(arg));
42 }
43
44 struct compat_hd_geometry {
45 unsigned char heads;
46 unsigned char sectors;
47 unsigned short cylinders;
48 u32 start;
49 };
50
compat_hdio_getgeo(struct gendisk * disk,struct block_device * bdev,struct compat_hd_geometry __user * ugeo)51 static int compat_hdio_getgeo(struct gendisk *disk, struct block_device *bdev,
52 struct compat_hd_geometry __user *ugeo)
53 {
54 struct hd_geometry geo;
55 int ret;
56
57 if (!ugeo)
58 return -EINVAL;
59 if (!disk->fops->getgeo)
60 return -ENOTTY;
61
62 memset(&geo, 0, sizeof(geo));
63 /*
64 * We need to set the startsect first, the driver may
65 * want to override it.
66 */
67 geo.start = get_start_sect(bdev);
68 ret = disk->fops->getgeo(bdev, &geo);
69 if (ret)
70 return ret;
71
72 ret = copy_to_user(ugeo, &geo, 4);
73 ret |= put_user(geo.start, &ugeo->start);
74 if (ret)
75 ret = -EFAULT;
76
77 return ret;
78 }
79
compat_hdio_ioctl(struct block_device * bdev,fmode_t mode,unsigned int cmd,unsigned long arg)80 static int compat_hdio_ioctl(struct block_device *bdev, fmode_t mode,
81 unsigned int cmd, unsigned long arg)
82 {
83 mm_segment_t old_fs = get_fs();
84 unsigned long kval;
85 unsigned int __user *uvp;
86 int error;
87
88 set_fs(KERNEL_DS);
89 error = __blkdev_driver_ioctl(bdev, mode,
90 cmd, (unsigned long)(&kval));
91 set_fs(old_fs);
92
93 if (error == 0) {
94 uvp = compat_ptr(arg);
95 if (put_user(kval, uvp))
96 error = -EFAULT;
97 }
98 return error;
99 }
100
101 struct compat_cdrom_read_audio {
102 union cdrom_addr addr;
103 u8 addr_format;
104 compat_int_t nframes;
105 compat_caddr_t buf;
106 };
107
108 struct compat_cdrom_generic_command {
109 unsigned char cmd[CDROM_PACKET_SIZE];
110 compat_caddr_t buffer;
111 compat_uint_t buflen;
112 compat_int_t stat;
113 compat_caddr_t sense;
114 unsigned char data_direction;
115 compat_int_t quiet;
116 compat_int_t timeout;
117 compat_caddr_t reserved[1];
118 };
119
compat_cdrom_read_audio(struct block_device * bdev,fmode_t mode,unsigned int cmd,unsigned long arg)120 static int compat_cdrom_read_audio(struct block_device *bdev, fmode_t mode,
121 unsigned int cmd, unsigned long arg)
122 {
123 struct cdrom_read_audio __user *cdread_audio;
124 struct compat_cdrom_read_audio __user *cdread_audio32;
125 __u32 data;
126 void __user *datap;
127
128 cdread_audio = compat_alloc_user_space(sizeof(*cdread_audio));
129 cdread_audio32 = compat_ptr(arg);
130
131 if (copy_in_user(&cdread_audio->addr,
132 &cdread_audio32->addr,
133 (sizeof(*cdread_audio32) -
134 sizeof(compat_caddr_t))))
135 return -EFAULT;
136
137 if (get_user(data, &cdread_audio32->buf))
138 return -EFAULT;
139 datap = compat_ptr(data);
140 if (put_user(datap, &cdread_audio->buf))
141 return -EFAULT;
142
143 return __blkdev_driver_ioctl(bdev, mode, cmd,
144 (unsigned long)cdread_audio);
145 }
146
compat_cdrom_generic_command(struct block_device * bdev,fmode_t mode,unsigned int cmd,unsigned long arg)147 static int compat_cdrom_generic_command(struct block_device *bdev, fmode_t mode,
148 unsigned int cmd, unsigned long arg)
149 {
150 struct cdrom_generic_command __user *cgc;
151 struct compat_cdrom_generic_command __user *cgc32;
152 u32 data;
153 unsigned char dir;
154 int itmp;
155
156 cgc = compat_alloc_user_space(sizeof(*cgc));
157 cgc32 = compat_ptr(arg);
158
159 if (copy_in_user(&cgc->cmd, &cgc32->cmd, sizeof(cgc->cmd)) ||
160 get_user(data, &cgc32->buffer) ||
161 put_user(compat_ptr(data), &cgc->buffer) ||
162 copy_in_user(&cgc->buflen, &cgc32->buflen,
163 (sizeof(unsigned int) + sizeof(int))) ||
164 get_user(data, &cgc32->sense) ||
165 put_user(compat_ptr(data), &cgc->sense) ||
166 get_user(dir, &cgc32->data_direction) ||
167 put_user(dir, &cgc->data_direction) ||
168 get_user(itmp, &cgc32->quiet) ||
169 put_user(itmp, &cgc->quiet) ||
170 get_user(itmp, &cgc32->timeout) ||
171 put_user(itmp, &cgc->timeout) ||
172 get_user(data, &cgc32->reserved[0]) ||
173 put_user(compat_ptr(data), &cgc->reserved[0]))
174 return -EFAULT;
175
176 return __blkdev_driver_ioctl(bdev, mode, cmd, (unsigned long)cgc);
177 }
178
179 struct compat_blkpg_ioctl_arg {
180 compat_int_t op;
181 compat_int_t flags;
182 compat_int_t datalen;
183 compat_caddr_t data;
184 };
185
compat_blkpg_ioctl(struct block_device * bdev,fmode_t mode,unsigned int cmd,struct compat_blkpg_ioctl_arg __user * ua32)186 static int compat_blkpg_ioctl(struct block_device *bdev, fmode_t mode,
187 unsigned int cmd, struct compat_blkpg_ioctl_arg __user *ua32)
188 {
189 struct blkpg_ioctl_arg __user *a = compat_alloc_user_space(sizeof(*a));
190 compat_caddr_t udata;
191 compat_int_t n;
192 int err;
193
194 err = get_user(n, &ua32->op);
195 err |= put_user(n, &a->op);
196 err |= get_user(n, &ua32->flags);
197 err |= put_user(n, &a->flags);
198 err |= get_user(n, &ua32->datalen);
199 err |= put_user(n, &a->datalen);
200 err |= get_user(udata, &ua32->data);
201 err |= put_user(compat_ptr(udata), &a->data);
202 if (err)
203 return err;
204
205 return blkdev_ioctl(bdev, mode, cmd, (unsigned long)a);
206 }
207
208 #define BLKBSZGET_32 _IOR(0x12, 112, int)
209 #define BLKBSZSET_32 _IOW(0x12, 113, int)
210 #define BLKGETSIZE64_32 _IOR(0x12, 114, int)
211
compat_blkdev_driver_ioctl(struct block_device * bdev,fmode_t mode,unsigned cmd,unsigned long arg)212 static int compat_blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
213 unsigned cmd, unsigned long arg)
214 {
215 switch (cmd) {
216 case HDIO_GET_UNMASKINTR:
217 case HDIO_GET_MULTCOUNT:
218 case HDIO_GET_KEEPSETTINGS:
219 case HDIO_GET_32BIT:
220 case HDIO_GET_NOWERR:
221 case HDIO_GET_DMA:
222 case HDIO_GET_NICE:
223 case HDIO_GET_WCACHE:
224 case HDIO_GET_ACOUSTIC:
225 case HDIO_GET_ADDRESS:
226 case HDIO_GET_BUSSTATE:
227 return compat_hdio_ioctl(bdev, mode, cmd, arg);
228 case CDROMREADAUDIO:
229 return compat_cdrom_read_audio(bdev, mode, cmd, arg);
230 case CDROM_SEND_PACKET:
231 return compat_cdrom_generic_command(bdev, mode, cmd, arg);
232
233 /*
234 * No handler required for the ones below, we just need to
235 * convert arg to a 64 bit pointer.
236 */
237 case BLKSECTSET:
238 /*
239 * 0x03 -- HD/IDE ioctl's used by hdparm and friends.
240 * Some need translations, these do not.
241 */
242 case HDIO_GET_IDENTITY:
243 case HDIO_DRIVE_TASK:
244 case HDIO_DRIVE_CMD:
245 /* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */
246 case 0x330:
247 /* CDROM stuff */
248 case CDROMPAUSE:
249 case CDROMRESUME:
250 case CDROMPLAYMSF:
251 case CDROMPLAYTRKIND:
252 case CDROMREADTOCHDR:
253 case CDROMREADTOCENTRY:
254 case CDROMSTOP:
255 case CDROMSTART:
256 case CDROMEJECT:
257 case CDROMVOLCTRL:
258 case CDROMSUBCHNL:
259 case CDROMMULTISESSION:
260 case CDROM_GET_MCN:
261 case CDROMRESET:
262 case CDROMVOLREAD:
263 case CDROMSEEK:
264 case CDROMPLAYBLK:
265 case CDROMCLOSETRAY:
266 case CDROM_DISC_STATUS:
267 case CDROM_CHANGER_NSLOTS:
268 case CDROM_GET_CAPABILITY:
269 /* Ignore cdrom.h about these next 5 ioctls, they absolutely do
270 * not take a struct cdrom_read, instead they take a struct cdrom_msf
271 * which is compatible.
272 */
273 case CDROMREADMODE2:
274 case CDROMREADMODE1:
275 case CDROMREADRAW:
276 case CDROMREADCOOKED:
277 case CDROMREADALL:
278 /* DVD ioctls */
279 case DVD_READ_STRUCT:
280 case DVD_WRITE_STRUCT:
281 case DVD_AUTH:
282 arg = (unsigned long)compat_ptr(arg);
283 /* These intepret arg as an unsigned long, not as a pointer,
284 * so we must not do compat_ptr() conversion. */
285 case HDIO_SET_MULTCOUNT:
286 case HDIO_SET_UNMASKINTR:
287 case HDIO_SET_KEEPSETTINGS:
288 case HDIO_SET_32BIT:
289 case HDIO_SET_NOWERR:
290 case HDIO_SET_DMA:
291 case HDIO_SET_PIO_MODE:
292 case HDIO_SET_NICE:
293 case HDIO_SET_WCACHE:
294 case HDIO_SET_ACOUSTIC:
295 case HDIO_SET_BUSSTATE:
296 case HDIO_SET_ADDRESS:
297 case CDROMEJECT_SW:
298 case CDROM_SET_OPTIONS:
299 case CDROM_CLEAR_OPTIONS:
300 case CDROM_SELECT_SPEED:
301 case CDROM_SELECT_DISC:
302 case CDROM_MEDIA_CHANGED:
303 case CDROM_DRIVE_STATUS:
304 case CDROM_LOCKDOOR:
305 case CDROM_DEBUG:
306 break;
307 default:
308 /* unknown ioctl number */
309 return -ENOIOCTLCMD;
310 }
311
312 return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
313 }
314
315 /* Most of the generic ioctls are handled in the normal fallback path.
316 This assumes the blkdev's low level compat_ioctl always returns
317 ENOIOCTLCMD for unknown ioctls. */
compat_blkdev_ioctl(struct file * file,unsigned cmd,unsigned long arg)318 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
319 {
320 int ret = -ENOIOCTLCMD;
321 struct inode *inode = file->f_mapping->host;
322 struct block_device *bdev = inode->i_bdev;
323 struct gendisk *disk = bdev->bd_disk;
324 fmode_t mode = file->f_mode;
325 struct backing_dev_info *bdi;
326 loff_t size;
327 unsigned int max_sectors;
328
329 /*
330 * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
331 * to updated it before every ioctl.
332 */
333 if (file->f_flags & O_NDELAY)
334 mode |= FMODE_NDELAY;
335 else
336 mode &= ~FMODE_NDELAY;
337
338 switch (cmd) {
339 case HDIO_GETGEO:
340 return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
341 case BLKPBSZGET:
342 return compat_put_uint(arg, bdev_physical_block_size(bdev));
343 case BLKIOMIN:
344 return compat_put_uint(arg, bdev_io_min(bdev));
345 case BLKIOOPT:
346 return compat_put_uint(arg, bdev_io_opt(bdev));
347 case BLKALIGNOFF:
348 return compat_put_int(arg, bdev_alignment_offset(bdev));
349 case BLKDISCARDZEROES:
350 return compat_put_uint(arg, bdev_discard_zeroes_data(bdev));
351 case BLKFLSBUF:
352 case BLKROSET:
353 case BLKDISCARD:
354 case BLKSECDISCARD:
355 case BLKZEROOUT:
356 /*
357 * the ones below are implemented in blkdev_locked_ioctl,
358 * but we call blkdev_ioctl, which gets the lock for us
359 */
360 case BLKRRPART:
361 return blkdev_ioctl(bdev, mode, cmd,
362 (unsigned long)compat_ptr(arg));
363 case BLKBSZSET_32:
364 return blkdev_ioctl(bdev, mode, BLKBSZSET,
365 (unsigned long)compat_ptr(arg));
366 case BLKPG:
367 return compat_blkpg_ioctl(bdev, mode, cmd, compat_ptr(arg));
368 case BLKRAGET:
369 case BLKFRAGET:
370 if (!arg)
371 return -EINVAL;
372 bdi = blk_get_backing_dev_info(bdev);
373 return compat_put_long(arg,
374 (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
375 case BLKROGET: /* compatible */
376 return compat_put_int(arg, bdev_read_only(bdev) != 0);
377 case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
378 return compat_put_int(arg, block_size(bdev));
379 case BLKSSZGET: /* get block device hardware sector size */
380 return compat_put_int(arg, bdev_logical_block_size(bdev));
381 case BLKSECTGET:
382 max_sectors = min_t(unsigned int, USHRT_MAX,
383 queue_max_sectors(bdev_get_queue(bdev)));
384 return compat_put_ushort(arg, max_sectors);
385 case BLKROTATIONAL:
386 return compat_put_ushort(arg,
387 !blk_queue_nonrot(bdev_get_queue(bdev)));
388 case BLKRASET: /* compatible, but no compat_ptr (!) */
389 case BLKFRASET:
390 if (!capable(CAP_SYS_ADMIN))
391 return -EACCES;
392 bdi = blk_get_backing_dev_info(bdev);
393 bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
394 return 0;
395 case BLKGETSIZE:
396 size = i_size_read(bdev->bd_inode);
397 if ((size >> 9) > ~0UL)
398 return -EFBIG;
399 return compat_put_ulong(arg, size >> 9);
400
401 case BLKGETSIZE64_32:
402 return compat_put_u64(arg, i_size_read(bdev->bd_inode));
403
404 case BLKTRACESETUP32:
405 case BLKTRACESTART: /* compatible */
406 case BLKTRACESTOP: /* compatible */
407 case BLKTRACETEARDOWN: /* compatible */
408 ret = blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
409 return ret;
410 case IOC_PR_REGISTER:
411 case IOC_PR_RESERVE:
412 case IOC_PR_RELEASE:
413 case IOC_PR_PREEMPT:
414 case IOC_PR_PREEMPT_ABORT:
415 case IOC_PR_CLEAR:
416 return blkdev_ioctl(bdev, mode, cmd,
417 (unsigned long)compat_ptr(arg));
418 default:
419 if (disk->fops->compat_ioctl)
420 ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
421 if (ret == -ENOIOCTLCMD)
422 ret = compat_blkdev_driver_ioctl(bdev, mode, cmd, arg);
423 return ret;
424 }
425 }
426