Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
f58c4c0a AB |
2 | #include <linux/blkdev.h> |
3 | #include <linux/blkpg.h> | |
4 | #include <linux/blktrace_api.h> | |
5 | #include <linux/cdrom.h> | |
6 | #include <linux/compat.h> | |
7 | #include <linux/elevator.h> | |
f58c4c0a | 8 | #include <linux/hdreg.h> |
b2c0fcd2 | 9 | #include <linux/pr.h> |
5a0e3ad6 | 10 | #include <linux/slab.h> |
f58c4c0a | 11 | #include <linux/syscalls.h> |
f58c4c0a AB |
12 | #include <linux/types.h> |
13 | #include <linux/uaccess.h> | |
14 | ||
15 | static int compat_put_ushort(unsigned long arg, unsigned short val) | |
16 | { | |
17 | return put_user(val, (unsigned short __user *)compat_ptr(arg)); | |
18 | } | |
19 | ||
20 | static int compat_put_int(unsigned long arg, int val) | |
21 | { | |
22 | return put_user(val, (compat_int_t __user *)compat_ptr(arg)); | |
23 | } | |
24 | ||
ac481c20 MP |
25 | static int compat_put_uint(unsigned long arg, unsigned int val) |
26 | { | |
27 | return put_user(val, (compat_uint_t __user *)compat_ptr(arg)); | |
28 | } | |
29 | ||
f58c4c0a AB |
30 | static int compat_put_long(unsigned long arg, long val) |
31 | { | |
32 | return put_user(val, (compat_long_t __user *)compat_ptr(arg)); | |
33 | } | |
34 | ||
35 | static int compat_put_ulong(unsigned long arg, compat_ulong_t val) | |
36 | { | |
37 | return put_user(val, (compat_ulong_t __user *)compat_ptr(arg)); | |
38 | } | |
39 | ||
40 | static int compat_put_u64(unsigned long arg, u64 val) | |
41 | { | |
42 | return put_user(val, (compat_u64 __user *)compat_ptr(arg)); | |
43 | } | |
44 | ||
9617db08 AB |
45 | struct compat_hd_geometry { |
46 | unsigned char heads; | |
47 | unsigned char sectors; | |
48 | unsigned short cylinders; | |
49 | u32 start; | |
50 | }; | |
51 | ||
52 | static int compat_hdio_getgeo(struct gendisk *disk, struct block_device *bdev, | |
53 | struct compat_hd_geometry __user *ugeo) | |
54 | { | |
55 | struct hd_geometry geo; | |
56 | int ret; | |
57 | ||
58 | if (!ugeo) | |
59 | return -EINVAL; | |
60 | if (!disk->fops->getgeo) | |
61 | return -ENOTTY; | |
62 | ||
8b0d77f1 | 63 | memset(&geo, 0, sizeof(geo)); |
9617db08 AB |
64 | /* |
65 | * We need to set the startsect first, the driver may | |
66 | * want to override it. | |
67 | */ | |
68 | geo.start = get_start_sect(bdev); | |
69 | ret = disk->fops->getgeo(bdev, &geo); | |
70 | if (ret) | |
71 | return ret; | |
72 | ||
73 | ret = copy_to_user(ugeo, &geo, 4); | |
3ddc5b46 | 74 | ret |= put_user(geo.start, &ugeo->start); |
9617db08 AB |
75 | if (ret) |
76 | ret = -EFAULT; | |
77 | ||
78 | return ret; | |
79 | } | |
80 | ||
33c2dca4 AV |
81 | static int compat_hdio_ioctl(struct block_device *bdev, fmode_t mode, |
82 | unsigned int cmd, unsigned long arg) | |
9617db08 | 83 | { |
8363dae2 | 84 | unsigned long __user *p; |
9617db08 AB |
85 | int error; |
86 | ||
30138384 | 87 | p = compat_alloc_user_space(sizeof(unsigned long)); |
33c2dca4 | 88 | error = __blkdev_driver_ioctl(bdev, mode, |
30138384 | 89 | cmd, (unsigned long)p); |
9617db08 | 90 | if (error == 0) { |
30138384 AV |
91 | unsigned int __user *uvp = compat_ptr(arg); |
92 | unsigned long v; | |
93 | if (get_user(v, p) || put_user(v, uvp)) | |
9617db08 AB |
94 | error = -EFAULT; |
95 | } | |
96 | return error; | |
97 | } | |
98 | ||
18cf7f87 AB |
99 | struct compat_blkpg_ioctl_arg { |
100 | compat_int_t op; | |
101 | compat_int_t flags; | |
102 | compat_int_t datalen; | |
103 | compat_caddr_t data; | |
104 | }; | |
105 | ||
56b26add | 106 | static int compat_blkpg_ioctl(struct block_device *bdev, fmode_t mode, |
18cf7f87 AB |
107 | unsigned int cmd, struct compat_blkpg_ioctl_arg __user *ua32) |
108 | { | |
109 | struct blkpg_ioctl_arg __user *a = compat_alloc_user_space(sizeof(*a)); | |
110 | compat_caddr_t udata; | |
111 | compat_int_t n; | |
112 | int err; | |
113 | ||
114 | err = get_user(n, &ua32->op); | |
115 | err |= put_user(n, &a->op); | |
116 | err |= get_user(n, &ua32->flags); | |
117 | err |= put_user(n, &a->flags); | |
118 | err |= get_user(n, &ua32->datalen); | |
119 | err |= put_user(n, &a->datalen); | |
120 | err |= get_user(udata, &ua32->data); | |
121 | err |= put_user(compat_ptr(udata), &a->data); | |
122 | if (err) | |
123 | return err; | |
124 | ||
56b26add | 125 | return blkdev_ioctl(bdev, mode, cmd, (unsigned long)a); |
18cf7f87 AB |
126 | } |
127 | ||
f58c4c0a AB |
128 | #define BLKBSZGET_32 _IOR(0x12, 112, int) |
129 | #define BLKBSZSET_32 _IOW(0x12, 113, int) | |
130 | #define BLKGETSIZE64_32 _IOR(0x12, 114, int) | |
131 | ||
33c2dca4 AV |
132 | static int compat_blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode, |
133 | unsigned cmd, unsigned long arg) | |
7199d4cd | 134 | { |
33013a88 | 135 | switch (cmd) { |
9617db08 AB |
136 | case HDIO_GET_UNMASKINTR: |
137 | case HDIO_GET_MULTCOUNT: | |
138 | case HDIO_GET_KEEPSETTINGS: | |
139 | case HDIO_GET_32BIT: | |
140 | case HDIO_GET_NOWERR: | |
141 | case HDIO_GET_DMA: | |
142 | case HDIO_GET_NICE: | |
143 | case HDIO_GET_WCACHE: | |
144 | case HDIO_GET_ACOUSTIC: | |
145 | case HDIO_GET_ADDRESS: | |
146 | case HDIO_GET_BUSSTATE: | |
33c2dca4 | 147 | return compat_hdio_ioctl(bdev, mode, cmd, arg); |
b3087cc4 | 148 | |
7199d4cd AB |
149 | /* |
150 | * No handler required for the ones below, we just need to | |
151 | * convert arg to a 64 bit pointer. | |
152 | */ | |
153 | case BLKSECTSET: | |
154 | /* | |
155 | * 0x03 -- HD/IDE ioctl's used by hdparm and friends. | |
156 | * Some need translations, these do not. | |
157 | */ | |
158 | case HDIO_GET_IDENTITY: | |
159 | case HDIO_DRIVE_TASK: | |
160 | case HDIO_DRIVE_CMD: | |
7199d4cd AB |
161 | /* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */ |
162 | case 0x330: | |
7199d4cd AB |
163 | /* CDROM stuff */ |
164 | case CDROMPAUSE: | |
165 | case CDROMRESUME: | |
166 | case CDROMPLAYMSF: | |
167 | case CDROMPLAYTRKIND: | |
168 | case CDROMREADTOCHDR: | |
169 | case CDROMREADTOCENTRY: | |
170 | case CDROMSTOP: | |
171 | case CDROMSTART: | |
172 | case CDROMEJECT: | |
173 | case CDROMVOLCTRL: | |
174 | case CDROMSUBCHNL: | |
175 | case CDROMMULTISESSION: | |
176 | case CDROM_GET_MCN: | |
177 | case CDROMRESET: | |
178 | case CDROMVOLREAD: | |
179 | case CDROMSEEK: | |
180 | case CDROMPLAYBLK: | |
181 | case CDROMCLOSETRAY: | |
182 | case CDROM_DISC_STATUS: | |
183 | case CDROM_CHANGER_NSLOTS: | |
184 | case CDROM_GET_CAPABILITY: | |
f3ee6e63 | 185 | case CDROM_SEND_PACKET: |
7199d4cd AB |
186 | /* Ignore cdrom.h about these next 5 ioctls, they absolutely do |
187 | * not take a struct cdrom_read, instead they take a struct cdrom_msf | |
188 | * which is compatible. | |
189 | */ | |
190 | case CDROMREADMODE2: | |
191 | case CDROMREADMODE1: | |
192 | case CDROMREADRAW: | |
193 | case CDROMREADCOOKED: | |
194 | case CDROMREADALL: | |
195 | /* DVD ioctls */ | |
196 | case DVD_READ_STRUCT: | |
197 | case DVD_WRITE_STRUCT: | |
198 | case DVD_AUTH: | |
199 | arg = (unsigned long)compat_ptr(arg); | |
1c925604 AS |
200 | /* These intepret arg as an unsigned long, not as a pointer, |
201 | * so we must not do compat_ptr() conversion. */ | |
202 | case HDIO_SET_MULTCOUNT: | |
203 | case HDIO_SET_UNMASKINTR: | |
204 | case HDIO_SET_KEEPSETTINGS: | |
205 | case HDIO_SET_32BIT: | |
206 | case HDIO_SET_NOWERR: | |
207 | case HDIO_SET_DMA: | |
208 | case HDIO_SET_PIO_MODE: | |
209 | case HDIO_SET_NICE: | |
210 | case HDIO_SET_WCACHE: | |
211 | case HDIO_SET_ACOUSTIC: | |
212 | case HDIO_SET_BUSSTATE: | |
213 | case HDIO_SET_ADDRESS: | |
214 | case CDROMEJECT_SW: | |
215 | case CDROM_SET_OPTIONS: | |
216 | case CDROM_CLEAR_OPTIONS: | |
217 | case CDROM_SELECT_SPEED: | |
218 | case CDROM_SELECT_DISC: | |
219 | case CDROM_MEDIA_CHANGED: | |
220 | case CDROM_DRIVE_STATUS: | |
221 | case CDROM_LOCKDOOR: | |
222 | case CDROM_DEBUG: | |
7199d4cd AB |
223 | break; |
224 | default: | |
225 | /* unknown ioctl number */ | |
226 | return -ENOIOCTLCMD; | |
227 | } | |
228 | ||
33c2dca4 | 229 | return __blkdev_driver_ioctl(bdev, mode, cmd, arg); |
7199d4cd AB |
230 | } |
231 | ||
45048d09 AV |
232 | /* Most of the generic ioctls are handled in the normal fallback path. |
233 | This assumes the blkdev's low level compat_ioctl always returns | |
234 | ENOIOCTLCMD for unknown ioctls. */ | |
235 | long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg) | |
f58c4c0a | 236 | { |
45048d09 AV |
237 | int ret = -ENOIOCTLCMD; |
238 | struct inode *inode = file->f_mapping->host; | |
239 | struct block_device *bdev = inode->i_bdev; | |
240 | struct gendisk *disk = bdev->bd_disk; | |
241 | fmode_t mode = file->f_mode; | |
45048d09 | 242 | loff_t size; |
63f26496 | 243 | unsigned int max_sectors; |
45048d09 | 244 | |
fd4ce1ac CH |
245 | /* |
246 | * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have | |
247 | * to updated it before every ioctl. | |
248 | */ | |
45048d09 | 249 | if (file->f_flags & O_NDELAY) |
fd4ce1ac CH |
250 | mode |= FMODE_NDELAY; |
251 | else | |
252 | mode &= ~FMODE_NDELAY; | |
f58c4c0a AB |
253 | |
254 | switch (cmd) { | |
45048d09 AV |
255 | case HDIO_GETGEO: |
256 | return compat_hdio_getgeo(disk, bdev, compat_ptr(arg)); | |
ac481c20 MP |
257 | case BLKPBSZGET: |
258 | return compat_put_uint(arg, bdev_physical_block_size(bdev)); | |
259 | case BLKIOMIN: | |
260 | return compat_put_uint(arg, bdev_io_min(bdev)); | |
261 | case BLKIOOPT: | |
262 | return compat_put_uint(arg, bdev_io_opt(bdev)); | |
263 | case BLKALIGNOFF: | |
264 | return compat_put_int(arg, bdev_alignment_offset(bdev)); | |
98262f27 | 265 | case BLKDISCARDZEROES: |
48920ff2 | 266 | return compat_put_uint(arg, 0); |
45048d09 AV |
267 | case BLKFLSBUF: |
268 | case BLKROSET: | |
269 | case BLKDISCARD: | |
8d57a98c | 270 | case BLKSECDISCARD: |
3b3a1814 | 271 | case BLKZEROOUT: |
45048d09 AV |
272 | /* |
273 | * the ones below are implemented in blkdev_locked_ioctl, | |
274 | * but we call blkdev_ioctl, which gets the lock for us | |
275 | */ | |
276 | case BLKRRPART: | |
673bdf8c AB |
277 | case BLKREPORTZONE: |
278 | case BLKRESETZONE: | |
4b43f31d AB |
279 | case BLKOPENZONE: |
280 | case BLKCLOSEZONE: | |
281 | case BLKFINISHZONE: | |
21d37340 AB |
282 | case BLKGETZONESZ: |
283 | case BLKGETNRZONES: | |
56b26add | 284 | return blkdev_ioctl(bdev, mode, cmd, |
45048d09 AV |
285 | (unsigned long)compat_ptr(arg)); |
286 | case BLKBSZSET_32: | |
56b26add | 287 | return blkdev_ioctl(bdev, mode, BLKBSZSET, |
45048d09 AV |
288 | (unsigned long)compat_ptr(arg)); |
289 | case BLKPG: | |
56b26add | 290 | return compat_blkpg_ioctl(bdev, mode, cmd, compat_ptr(arg)); |
f58c4c0a AB |
291 | case BLKRAGET: |
292 | case BLKFRAGET: | |
293 | if (!arg) | |
294 | return -EINVAL; | |
f58c4c0a | 295 | return compat_put_long(arg, |
efa7c9f9 | 296 | (bdev->bd_bdi->ra_pages * PAGE_SIZE) / 512); |
f58c4c0a AB |
297 | case BLKROGET: /* compatible */ |
298 | return compat_put_int(arg, bdev_read_only(bdev) != 0); | |
299 | case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */ | |
300 | return compat_put_int(arg, block_size(bdev)); | |
301 | case BLKSSZGET: /* get block device hardware sector size */ | |
e1defc4f | 302 | return compat_put_int(arg, bdev_logical_block_size(bdev)); |
f58c4c0a | 303 | case BLKSECTGET: |
63f26496 AM |
304 | max_sectors = min_t(unsigned int, USHRT_MAX, |
305 | queue_max_sectors(bdev_get_queue(bdev))); | |
306 | return compat_put_ushort(arg, max_sectors); | |
ef00f59c MP |
307 | case BLKROTATIONAL: |
308 | return compat_put_ushort(arg, | |
309 | !blk_queue_nonrot(bdev_get_queue(bdev))); | |
f58c4c0a AB |
310 | case BLKRASET: /* compatible, but no compat_ptr (!) */ |
311 | case BLKFRASET: | |
312 | if (!capable(CAP_SYS_ADMIN)) | |
313 | return -EACCES; | |
efa7c9f9 | 314 | bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE; |
f58c4c0a AB |
315 | return 0; |
316 | case BLKGETSIZE: | |
77304d2a | 317 | size = i_size_read(bdev->bd_inode); |
45048d09 | 318 | if ((size >> 9) > ~0UL) |
f58c4c0a | 319 | return -EFBIG; |
45048d09 | 320 | return compat_put_ulong(arg, size >> 9); |
f58c4c0a AB |
321 | |
322 | case BLKGETSIZE64_32: | |
77304d2a | 323 | return compat_put_u64(arg, i_size_read(bdev->bd_inode)); |
171044d4 AB |
324 | |
325 | case BLKTRACESETUP32: | |
171044d4 AB |
326 | case BLKTRACESTART: /* compatible */ |
327 | case BLKTRACESTOP: /* compatible */ | |
328 | case BLKTRACETEARDOWN: /* compatible */ | |
45048d09 | 329 | ret = blk_trace_ioctl(bdev, cmd, compat_ptr(arg)); |
7199d4cd | 330 | return ret; |
b2c0fcd2 AB |
331 | case IOC_PR_REGISTER: |
332 | case IOC_PR_RESERVE: | |
333 | case IOC_PR_RELEASE: | |
334 | case IOC_PR_PREEMPT: | |
335 | case IOC_PR_PREEMPT_ABORT: | |
336 | case IOC_PR_CLEAR: | |
337 | return blkdev_ioctl(bdev, mode, cmd, | |
338 | (unsigned long)compat_ptr(arg)); | |
45048d09 AV |
339 | default: |
340 | if (disk->fops->compat_ioctl) | |
341 | ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg); | |
342 | if (ret == -ENOIOCTLCMD) | |
343 | ret = compat_blkdev_driver_ioctl(bdev, mode, cmd, arg); | |
344 | return ret; | |
345 | } | |
f58c4c0a | 346 | } |