1 /*-
2 * Copyright (c) 2001 The FreeBSD Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: releng/11.1/sys/compat/linux/linux_uid16.c 283427 2015-05-24 16:14:41Z dchagin $");
29
30 #include "opt_compat.h"
31
32 #include <sys/fcntl.h>
33 #include <sys/param.h>
34 #include <sys/kernel.h>
35 #include <sys/lock.h>
36 #include <sys/malloc.h>
37 #include <sys/mutex.h>
38 #include <sys/priv.h>
39 #include <sys/proc.h>
40 #include <sys/sdt.h>
41 #include <sys/syscallsubr.h>
42 #include <sys/sysproto.h>
43 #include <sys/systm.h>
44
45 #ifdef COMPAT_LINUX32
46 #include <machine/../linux32/linux.h>
47 #include <machine/../linux32/linux32_proto.h>
48 #else
49 #include <machine/../linux/linux.h>
50 #include <machine/../linux/linux_proto.h>
51 #endif
52
53 #include <compat/linux/linux_dtrace.h>
54 #include <compat/linux/linux_util.h>
55
56 /* DTrace init */
57 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
58
59 /**
60 * DTrace probes in this module.
61 */
62 LIN_SDT_PROBE_DEFINE3(uid16, linux_chown16, entry, "char *", "l_uid16_t",
63 "l_gid16_t");
64 LIN_SDT_PROBE_DEFINE1(uid16, linux_chown16, conv_path, "char *");
65 LIN_SDT_PROBE_DEFINE1(uid16, linux_chown16, return, "int");
66 LIN_SDT_PROBE_DEFINE3(uid16, linux_lchown16, entry, "char *", "l_uid16_t",
67 "l_gid16_t");
68 LIN_SDT_PROBE_DEFINE1(uid16, linux_lchown16, conv_path, "char *");
69 LIN_SDT_PROBE_DEFINE1(uid16, linux_lchown16, return, "int");
70 LIN_SDT_PROBE_DEFINE2(uid16, linux_setgroups16, entry, "l_uint", "l_gid16_t *");
71 LIN_SDT_PROBE_DEFINE1(uid16, linux_setgroups16, copyin_error, "int");
72 LIN_SDT_PROBE_DEFINE1(uid16, linux_setgroups16, priv_check_cred_error, "int");
73 LIN_SDT_PROBE_DEFINE1(uid16, linux_setgroups16, return, "int");
74 LIN_SDT_PROBE_DEFINE2(uid16, linux_getgroups16, entry, "l_uint", "l_gid16_t *");
75 LIN_SDT_PROBE_DEFINE1(uid16, linux_getgroups16, copyout_error, "int");
76 LIN_SDT_PROBE_DEFINE1(uid16, linux_getgroups16, return, "int");
77 LIN_SDT_PROBE_DEFINE0(uid16, linux_getgid16, entry);
78 LIN_SDT_PROBE_DEFINE1(uid16, linux_getgid16, return, "int");
79 LIN_SDT_PROBE_DEFINE0(uid16, linux_getuid16, entry);
80 LIN_SDT_PROBE_DEFINE1(uid16, linux_getuid16, return, "int");
81 LIN_SDT_PROBE_DEFINE0(uid16, linux_getegid16, entry);
82 LIN_SDT_PROBE_DEFINE1(uid16, linux_getegid16, return, "int");
83 LIN_SDT_PROBE_DEFINE0(uid16, linux_geteuid16, entry);
84 LIN_SDT_PROBE_DEFINE1(uid16, linux_geteuid16, return, "int");
85 LIN_SDT_PROBE_DEFINE1(uid16, linux_setgid16, entry, "l_gid16_t");
86 LIN_SDT_PROBE_DEFINE1(uid16, linux_setgid16, return, "int");
87 LIN_SDT_PROBE_DEFINE1(uid16, linux_setuid16, entry, "l_uid16_t");
88 LIN_SDT_PROBE_DEFINE1(uid16, linux_setuid16, return, "int");
89 LIN_SDT_PROBE_DEFINE2(uid16, linux_setregid16, entry, "l_gid16_t", "l_gid16_t");
90 LIN_SDT_PROBE_DEFINE1(uid16, linux_setregid16, return, "int");
91 LIN_SDT_PROBE_DEFINE2(uid16, linux_setreuid16, entry, "l_uid16_t", "l_uid16_t");
92 LIN_SDT_PROBE_DEFINE1(uid16, linux_setreuid16, return, "int");
93 LIN_SDT_PROBE_DEFINE3(uid16, linux_setresgid16, entry, "l_gid16_t", "l_gid16_t",
94 "l_gid16_t");
95 LIN_SDT_PROBE_DEFINE1(uid16, linux_setresgid16, return, "int");
96 LIN_SDT_PROBE_DEFINE3(uid16, linux_setresuid16, entry, "l_uid16_t", "l_uid16_t",
97 "l_uid16_t");
98 LIN_SDT_PROBE_DEFINE1(uid16, linux_setresuid16, return, "int");
99
100 DUMMY(setfsuid16);
101 DUMMY(setfsgid16);
102 DUMMY(getresuid16);
103 DUMMY(getresgid16);
104
105 #define CAST_NOCHG(x) ((x == 0xFFFF) ? -1 : x)
106
107 int
108 linux_chown16(struct thread *td, struct linux_chown16_args *args)
109 {
110 char *path;
111 int error;
112
113 LCONVPATHEXIST(td, args->path, &path);
114
115 /*
116 * The DTrace probes have to be after the LCONVPATHEXIST, as
117 * LCONVPATHEXIST may return on its own and we do not want to
118 * have a stray entry without the corresponding return.
119 */
120 LIN_SDT_PROBE3(uid16, linux_chown16, entry, args->path, args->uid,
121 args->gid);
122 LIN_SDT_PROBE1(uid16, linux_chown16, conv_path, path);
123
124 error = kern_fchownat(td, AT_FDCWD, path, UIO_SYSSPACE,
125 CAST_NOCHG(args->uid), CAST_NOCHG(args->gid), 0);
126 LFREEPATH(path);
127
128 LIN_SDT_PROBE1(uid16, linux_chown16, return, error);
129 return (error);
130 }
131
132 int
133 linux_lchown16(struct thread *td, struct linux_lchown16_args *args)
134 {
135 char *path;
136 int error;
137
138 LCONVPATHEXIST(td, args->path, &path);
139
140 /*
141 * The DTrace probes have to be after the LCONVPATHEXIST, as
142 * LCONVPATHEXIST may return on its own and we do not want to
143 * have a stray entry without the corresponding return.
144 */
145 LIN_SDT_PROBE3(uid16, linux_lchown16, entry, args->path, args->uid,
146 args->gid);
147 LIN_SDT_PROBE1(uid16, linux_lchown16, conv_path, path);
148
149 error = kern_fchownat(td, AT_FDCWD, path, UIO_SYSSPACE,
150 CAST_NOCHG(args->uid), CAST_NOCHG(args->gid), AT_SYMLINK_NOFOLLOW);
151 LFREEPATH(path);
152
153 LIN_SDT_PROBE1(uid16, linux_lchown16, return, error);
154 return (error);
155 }
156
157 int
158 linux_setgroups16(struct thread *td, struct linux_setgroups16_args *args)
159 {
160 struct ucred *newcred, *oldcred;
161 l_gid16_t *linux_gidset;
162 gid_t *bsd_gidset;
163 int ngrp, error;
164 struct proc *p;
165
166 LIN_SDT_PROBE2(uid16, linux_setgroups16, entry, args->gidsetsize,
167 args->gidset);
168
169 ngrp = args->gidsetsize;
170 if (ngrp < 0 || ngrp >= ngroups_max + 1) {
171 LIN_SDT_PROBE1(uid16, linux_setgroups16, return, EINVAL);
172 return (EINVAL);
173 }
174 linux_gidset = malloc(ngrp * sizeof(*linux_gidset), M_LINUX, M_WAITOK);
175 error = copyin(args->gidset, linux_gidset, ngrp * sizeof(l_gid16_t));
176 if (error) {
177 LIN_SDT_PROBE1(uid16, linux_setgroups16, copyin_error, error);
178 LIN_SDT_PROBE1(uid16, linux_setgroups16, return, error);
179 free(linux_gidset, M_LINUX);
180 return (error);
181 }
182 newcred = crget();
183 p = td->td_proc;
184 PROC_LOCK(p);
185 oldcred = crcopysafe(p, newcred);
186
187 /*
188 * cr_groups[0] holds egid. Setting the whole set from
189 * the supplied set will cause egid to be changed too.
190 * Keep cr_groups[0] unchanged to prevent that.
191 */
192
193 if ((error = priv_check_cred(oldcred, PRIV_CRED_SETGROUPS, 0)) != 0) {
194 PROC_UNLOCK(p);
195 crfree(newcred);
196
197 LIN_SDT_PROBE1(uid16, linux_setgroups16, priv_check_cred_error,
198 error);
199 goto out;
200 }
201
202 if (ngrp > 0) {
203 newcred->cr_ngroups = ngrp + 1;
204
205 bsd_gidset = newcred->cr_groups;
206 ngrp--;
207 while (ngrp >= 0) {
208 bsd_gidset[ngrp + 1] = linux_gidset[ngrp];
209 ngrp--;
210 }
211 }
212 else
213 newcred->cr_ngroups = 1;
214
215 setsugid(td->td_proc);
216 proc_set_cred(p, newcred);
217 PROC_UNLOCK(p);
218 crfree(oldcred);
219 error = 0;
220 out:
221 free(linux_gidset, M_LINUX);
222
223 LIN_SDT_PROBE1(uid16, linux_setgroups16, return, error);
224 return (error);
225 }
226
227 int
228 linux_getgroups16(struct thread *td, struct linux_getgroups16_args *args)
229 {
230 struct ucred *cred;
231 l_gid16_t *linux_gidset;
232 gid_t *bsd_gidset;
233 int bsd_gidsetsz, ngrp, error;
234
235 LIN_SDT_PROBE2(uid16, linux_getgroups16, entry, args->gidsetsize,
236 args->gidset);
237
238 cred = td->td_ucred;
239 bsd_gidset = cred->cr_groups;
240 bsd_gidsetsz = cred->cr_ngroups - 1;
241
242 /*
243 * cr_groups[0] holds egid. Returning the whole set
244 * here will cause a duplicate. Exclude cr_groups[0]
245 * to prevent that.
246 */
247
248 if ((ngrp = args->gidsetsize) == 0) {
249 td->td_retval[0] = bsd_gidsetsz;
250
251 LIN_SDT_PROBE1(uid16, linux_getgroups16, return, 0);
252 return (0);
253 }
254
255 if (ngrp < bsd_gidsetsz) {
256 LIN_SDT_PROBE1(uid16, linux_getgroups16, return, EINVAL);
257 return (EINVAL);
258 }
259
260 ngrp = 0;
261 linux_gidset = malloc(bsd_gidsetsz * sizeof(*linux_gidset),
262 M_LINUX, M_WAITOK);
263 while (ngrp < bsd_gidsetsz) {
264 linux_gidset[ngrp] = bsd_gidset[ngrp + 1];
265 ngrp++;
266 }
267
268 error = copyout(linux_gidset, args->gidset, ngrp * sizeof(l_gid16_t));
269 free(linux_gidset, M_LINUX);
270 if (error) {
271 LIN_SDT_PROBE1(uid16, linux_getgroups16, copyout_error, error);
272 LIN_SDT_PROBE1(uid16, linux_getgroups16, return, error);
273 return (error);
274 }
275
276 td->td_retval[0] = ngrp;
277
278 LIN_SDT_PROBE1(uid16, linux_getgroups16, return, 0);
279 return (0);
280 }
281
282 /*
283 * The FreeBSD native getgid(2) and getuid(2) also modify td->td_retval[1]
284 * when COMPAT_43 is defined. This clobbers registers that are assumed to
285 * be preserved. The following lightweight syscalls fixes this. See also
286 * linux_getpid(2), linux_getgid(2) and linux_getuid(2) in linux_misc.c
287 *
288 * linux_getgid16() - MP SAFE
289 * linux_getuid16() - MP SAFE
290 */
291
292 int
293 linux_getgid16(struct thread *td, struct linux_getgid16_args *args)
294 {
295
296 LIN_SDT_PROBE0(uid16, linux_getgid16, entry);
297
298 td->td_retval[0] = td->td_ucred->cr_rgid;
299
300 LIN_SDT_PROBE1(uid16, linux_getgid16, return, 0);
301 return (0);
302 }
303
304 int
305 linux_getuid16(struct thread *td, struct linux_getuid16_args *args)
306 {
307
308 LIN_SDT_PROBE0(uid16, linux_getuid16, entry);
309
310 td->td_retval[0] = td->td_ucred->cr_ruid;
311
312 LIN_SDT_PROBE1(uid16, linux_getuid16, return, 0);
313 return (0);
314 }
315
316 int
317 linux_getegid16(struct thread *td, struct linux_getegid16_args *args)
318 {
319 struct getegid_args bsd;
320 int error;
321
322 LIN_SDT_PROBE0(uid16, linux_getegid16, entry);
323
324 error = sys_getegid(td, &bsd);
325
326 LIN_SDT_PROBE1(uid16, linux_getegid16, return, error);
327 return (error);
328 }
329
330 int
331 linux_geteuid16(struct thread *td, struct linux_geteuid16_args *args)
332 {
333 struct geteuid_args bsd;
334 int error;
335
336 LIN_SDT_PROBE0(uid16, linux_geteuid16, entry);
337
338 error = sys_geteuid(td, &bsd);
339
340 LIN_SDT_PROBE1(uid16, linux_geteuid16, return, error);
341 return (error);
342 }
343
344 int
345 linux_setgid16(struct thread *td, struct linux_setgid16_args *args)
346 {
347 struct setgid_args bsd;
348 int error;
349
350 LIN_SDT_PROBE1(uid16, linux_setgid16, entry, args->gid);
351
352 bsd.gid = args->gid;
353 error = sys_setgid(td, &bsd);
354
355 LIN_SDT_PROBE1(uid16, linux_setgid16, return, error);
356 return (error);
357 }
358
359 int
360 linux_setuid16(struct thread *td, struct linux_setuid16_args *args)
361 {
362 struct setuid_args bsd;
363 int error;
364
365 LIN_SDT_PROBE1(uid16, linux_setuid16, entry, args->uid);
366
367 bsd.uid = args->uid;
368 error = sys_setuid(td, &bsd);
369
370 LIN_SDT_PROBE1(uid16, linux_setuid16, return, error);
371 return (error);
372 }
373
374 int
375 linux_setregid16(struct thread *td, struct linux_setregid16_args *args)
376 {
377 struct setregid_args bsd;
378 int error;
379
380 LIN_SDT_PROBE2(uid16, linux_setregid16, entry, args->rgid, args->egid);
381
382 bsd.rgid = CAST_NOCHG(args->rgid);
383 bsd.egid = CAST_NOCHG(args->egid);
384 error = sys_setregid(td, &bsd);
385
386 LIN_SDT_PROBE1(uid16, linux_setregid16, return, error);
387 return (error);
388 }
389
390 int
391 linux_setreuid16(struct thread *td, struct linux_setreuid16_args *args)
392 {
393 struct setreuid_args bsd;
394 int error;
395
396 LIN_SDT_PROBE2(uid16, linux_setreuid16, entry, args->ruid, args->euid);
397
398 bsd.ruid = CAST_NOCHG(args->ruid);
399 bsd.euid = CAST_NOCHG(args->euid);
400 error = sys_setreuid(td, &bsd);
401
402 LIN_SDT_PROBE1(uid16, linux_setreuid16, return, error);
403 return (error);
404 }
405
406 int
407 linux_setresgid16(struct thread *td, struct linux_setresgid16_args *args)
408 {
409 struct setresgid_args bsd;
410 int error;
411
412 LIN_SDT_PROBE3(uid16, linux_setresgid16, entry, args->rgid, args->egid,
413 args->sgid);
414
415 bsd.rgid = CAST_NOCHG(args->rgid);
416 bsd.egid = CAST_NOCHG(args->egid);
417 bsd.sgid = CAST_NOCHG(args->sgid);
418 error = sys_setresgid(td, &bsd);
419
420 LIN_SDT_PROBE1(uid16, linux_setresgid16, return, error);
421 return (error);
422 }
423
424 int
425 linux_setresuid16(struct thread *td, struct linux_setresuid16_args *args)
426 {
427 struct setresuid_args bsd;
428 int error;
429
430 LIN_SDT_PROBE3(uid16, linux_setresuid16, entry, args->ruid, args->euid,
431 args->suid);
432
433 bsd.ruid = CAST_NOCHG(args->ruid);
434 bsd.euid = CAST_NOCHG(args->euid);
435 bsd.suid = CAST_NOCHG(args->suid);
436 error = sys_setresuid(td, &bsd);
437
438 LIN_SDT_PROBE1(uid16, linux_setresuid16, return, error);
439 return (error);
440 }
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