1 /*
2 * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
3 * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
4 * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
5 * Copyright (c) 1996-2001 Wichert Akkerman <wichert@cistron.nl>
6 * Copyright (c) 1999-2017 The strace developers.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. The name of the author may not be used to endorse or promote products
18 * derived from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include "defs.h"
33 #include <linux/ioctl.h>
34 #include "xlat/ioctl_dirs.h"
35
36 #ifdef HAVE_LINUX_INPUT_H
37 # include <linux/input.h>
38 #endif
39
40 #include "xlat/evdev_abs.h"
41 #include "xlat/evdev_ev.h"
42
43 static int
compare(const void * a,const void * b)44 compare(const void *a, const void *b)
45 {
46 const unsigned int code1 = (const uintptr_t) a;
47 const unsigned int code2 = ((struct_ioctlent *) b)->code;
48 return (code1 > code2) ? 1 : (code1 < code2) ? -1 : 0;
49 }
50
51 static const struct_ioctlent *
ioctl_lookup(const unsigned int code)52 ioctl_lookup(const unsigned int code)
53 {
54 struct_ioctlent *iop;
55
56 iop = bsearch((const void *) (const uintptr_t) code, ioctlent,
57 nioctlents, sizeof(ioctlent[0]), compare);
58 while (iop > ioctlent) {
59 iop--;
60 if (iop->code != code) {
61 iop++;
62 break;
63 }
64 }
65 return iop;
66 }
67
68 static const struct_ioctlent *
ioctl_next_match(const struct_ioctlent * iop)69 ioctl_next_match(const struct_ioctlent *iop)
70 {
71 const unsigned int code = iop->code;
72 iop++;
73 if (iop < ioctlent + nioctlents && iop->code == code)
74 return iop;
75 return NULL;
76 }
77
78 static void
ioctl_print_code(const unsigned int code)79 ioctl_print_code(const unsigned int code)
80 {
81 tprints("_IOC(");
82 printflags(ioctl_dirs, _IOC_DIR(code), "_IOC_???");
83 tprintf(", %#x, %#x, %#x)",
84 _IOC_TYPE(code), _IOC_NR(code), _IOC_SIZE(code));
85 }
86
87 static int
evdev_decode_number(const unsigned int code)88 evdev_decode_number(const unsigned int code)
89 {
90 const unsigned int nr = _IOC_NR(code);
91
92 if (_IOC_DIR(code) == _IOC_WRITE) {
93 if (nr >= 0xc0 && nr <= 0xc0 + 0x3f) {
94 tprints("EVIOCSABS(");
95 printxval(evdev_abs, nr - 0xc0, "ABS_???");
96 tprints(")");
97 return 1;
98 }
99 }
100
101 if (_IOC_DIR(code) != _IOC_READ)
102 return 0;
103
104 if (nr >= 0x20 && nr <= 0x20 + 0x1f) {
105 tprints("EVIOCGBIT(");
106 printxval(evdev_ev, nr - 0x20, "EV_???");
107 tprintf(", %u)", _IOC_SIZE(code));
108 return 1;
109 } else if (nr >= 0x40 && nr <= 0x40 + 0x3f) {
110 tprints("EVIOCGABS(");
111 printxval(evdev_abs, nr - 0x40, "ABS_???");
112 tprints(")");
113 return 1;
114 }
115
116 switch (_IOC_NR(nr)) {
117 case 0x06:
118 tprintf("EVIOCGNAME(%u)", _IOC_SIZE(code));
119 return 1;
120 case 0x07:
121 tprintf("EVIOCGPHYS(%u)", _IOC_SIZE(code));
122 return 1;
123 case 0x08:
124 tprintf("EVIOCGUNIQ(%u)", _IOC_SIZE(code));
125 return 1;
126 case 0x09:
127 tprintf("EVIOCGPROP(%u)", _IOC_SIZE(code));
128 return 1;
129 case 0x0a:
130 tprintf("EVIOCGMTSLOTS(%u)", _IOC_SIZE(code));
131 return 1;
132 case 0x18:
133 tprintf("EVIOCGKEY(%u)", _IOC_SIZE(code));
134 return 1;
135 case 0x19:
136 tprintf("EVIOCGLED(%u)", _IOC_SIZE(code));
137 return 1;
138 case 0x1a:
139 tprintf("EVIOCGSND(%u)", _IOC_SIZE(code));
140 return 1;
141 case 0x1b:
142 tprintf("EVIOCGSW(%u)", _IOC_SIZE(code));
143 return 1;
144 default:
145 return 0;
146 }
147 }
148
149 static int
hiddev_decode_number(const unsigned int code)150 hiddev_decode_number(const unsigned int code)
151 {
152 if (_IOC_DIR(code) == _IOC_READ) {
153 switch (_IOC_NR(code)) {
154 case 0x04:
155 tprintf("HIDIOCGRAWNAME(%u)", _IOC_SIZE(code));
156 return 1;
157 case 0x05:
158 tprintf("HIDIOCGRAWPHYS(%u)", _IOC_SIZE(code));
159 return 1;
160 case 0x06:
161 tprintf("HIDIOCSFEATURE(%u)", _IOC_SIZE(code));
162 return 1;
163 case 0x12:
164 tprintf("HIDIOCGPHYS(%u)", _IOC_SIZE(code));
165 return 1;
166 default:
167 return 0;
168 }
169 } else if (_IOC_DIR(code) == (_IOC_READ | _IOC_WRITE)) {
170 switch (_IOC_NR(code)) {
171 case 0x06:
172 tprintf("HIDIOCSFEATURE(%u)", _IOC_SIZE(code));
173 return 1;
174 case 0x07:
175 tprintf("HIDIOCGFEATURE(%u)", _IOC_SIZE(code));
176 return 1;
177 default:
178 return 0;
179 }
180 }
181
182 return 0;
183 }
184
185 static int
ioctl_decode_command_number(struct tcb * tcp)186 ioctl_decode_command_number(struct tcb *tcp)
187 {
188 const unsigned int code = tcp->u_arg[1];
189
190 switch (_IOC_TYPE(code)) {
191 case 'E':
192 return evdev_decode_number(code);
193 case 'H':
194 return hiddev_decode_number(code);
195 case 'M':
196 if (_IOC_DIR(code) == _IOC_WRITE) {
197 tprintf("MIXER_WRITE(%u)", _IOC_NR(code));
198 return 1;
199 } else if (_IOC_DIR(code) == _IOC_READ) {
200 tprintf("MIXER_READ(%u)", _IOC_NR(code));
201 return 1;
202 }
203 return 0;
204 case 'U':
205 if (_IOC_DIR(code) == _IOC_READ && _IOC_NR(code) == 0x2c) {
206 tprintf("UI_GET_SYSNAME(%u)", _IOC_SIZE(code));
207 return 1;
208 }
209 return 0;
210 case 'j':
211 if (_IOC_DIR(code) == _IOC_READ && _IOC_NR(code) == 0x13) {
212 tprintf("JSIOCGNAME(%u)", _IOC_SIZE(code));
213 return 1;
214 }
215 return 0;
216 case 'k':
217 if (_IOC_DIR(code) == _IOC_WRITE && _IOC_NR(code) == 0) {
218 tprintf("SPI_IOC_MESSAGE(%u)", _IOC_SIZE(code));
219 return 1;
220 }
221 return 0;
222 default:
223 return 0;
224 }
225 }
226
227 static int
ioctl_decode(struct tcb * tcp)228 ioctl_decode(struct tcb *tcp)
229 {
230 const unsigned int code = tcp->u_arg[1];
231 const kernel_ulong_t arg = tcp->u_arg[2];
232
233 switch (_IOC_TYPE(code)) {
234 #if defined(ALPHA) || defined(POWERPC)
235 case 'f': {
236 int ret = file_ioctl(tcp, code, arg);
237 if (ret != RVAL_DECODED)
238 return ret;
239 }
240 case 't':
241 case 'T':
242 return term_ioctl(tcp, code, arg);
243 #else /* !ALPHA */
244 case 'f':
245 return file_ioctl(tcp, code, arg);
246 case 0x54:
247 #endif /* !ALPHA */
248 return term_ioctl(tcp, code, arg);
249 case 0x89:
250 return sock_ioctl(tcp, code, arg);
251 case 'p':
252 return rtc_ioctl(tcp, code, arg);
253 case 0x03:
254 return hdio_ioctl(tcp, code, arg);
255 case 0x12:
256 return block_ioctl(tcp, code, arg);
257 case 'X':
258 return fs_x_ioctl(tcp, code, arg);
259 case 0x22:
260 return scsi_ioctl(tcp, code, arg);
261 case 'L':
262 return loop_ioctl(tcp, code, arg);
263 case 'M':
264 return mtd_ioctl(tcp, code, arg);
265 case 'o':
266 case 'O':
267 return ubi_ioctl(tcp, code, arg);
268 case 'V':
269 return v4l2_ioctl(tcp, code, arg);
270 case '=':
271 return ptp_ioctl(tcp, code, arg);
272 #ifdef HAVE_LINUX_INPUT_H
273 case 'E':
274 return evdev_ioctl(tcp, code, arg);
275 #endif
276 #ifdef HAVE_LINUX_USERFAULTFD_H
277 case 0xaa:
278 return uffdio_ioctl(tcp, code, arg);
279 #endif
280 #ifdef HAVE_LINUX_BTRFS_H
281 case 0x94:
282 return btrfs_ioctl(tcp, code, arg);
283 #endif
284 case 0xb7:
285 return nsfs_ioctl(tcp, code, arg);
286 #ifdef HAVE_LINUX_DM_IOCTL_H
287 case 0xfd:
288 return dm_ioctl(tcp, code, arg);
289 #endif
290 default:
291 break;
292 }
293 return 0;
294 }
295
SYS_FUNC(ioctl)296 SYS_FUNC(ioctl)
297 {
298 const struct_ioctlent *iop;
299 int ret;
300
301 if (entering(tcp)) {
302 printfd(tcp, tcp->u_arg[0]);
303 tprints(", ");
304 ret = ioctl_decode_command_number(tcp);
305 if (!(ret & IOCTL_NUMBER_STOP_LOOKUP)) {
306 iop = ioctl_lookup(tcp->u_arg[1]);
307 if (iop) {
308 if (ret)
309 tprints(" or ");
310 tprints(iop->symbol);
311 while ((iop = ioctl_next_match(iop)))
312 tprintf(" or %s", iop->symbol);
313 } else if (!ret) {
314 ioctl_print_code(tcp->u_arg[1]);
315 }
316 }
317 ret = ioctl_decode(tcp);
318 } else {
319 ret = ioctl_decode(tcp) | RVAL_DECODED;
320 }
321
322 if (ret & RVAL_DECODED) {
323 ret &= ~RVAL_DECODED;
324 if (ret)
325 --ret;
326 else
327 tprintf(", %#" PRI_klx, tcp->u_arg[2]);
328 ret |= RVAL_DECODED;
329 } else {
330 if (ret)
331 --ret;
332 }
333
334 return ret;
335 }
336