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/8.4/sys/compat/linux/linux_uid16.c 226641 2011-10-22 18:23:32Z brueffer $");
29
30 #include "opt_compat.h"
31
32 #include <sys/fcntl.h>
33 #include <sys/param.h>
34 #include <sys/lock.h>
35 #include <sys/malloc.h>
36 #include <sys/mutex.h>
37 #include <sys/priv.h>
38 #include <sys/proc.h>
39 #include <sys/syscallsubr.h>
40 #include <sys/sysproto.h>
41 #include <sys/systm.h>
42
43 #ifdef COMPAT_LINUX32
44 #include <machine/../linux32/linux.h>
45 #include <machine/../linux32/linux32_proto.h>
46 #else
47 #include <machine/../linux/linux.h>
48 #include <machine/../linux/linux_proto.h>
49 #endif
50
51 #include <compat/linux/linux_util.h>
52
53 DUMMY(setfsuid16);
54 DUMMY(setfsgid16);
55 DUMMY(getresuid16);
56 DUMMY(getresgid16);
57
58 #define CAST_NOCHG(x) ((x == 0xFFFF) ? -1 : x)
59
60 int
61 linux_chown16(struct thread *td, struct linux_chown16_args *args)
62 {
63 char *path;
64 int error;
65
66 LCONVPATHEXIST(td, args->path, &path);
67
68 #ifdef DEBUG
69 if (ldebug(chown16))
70 printf(ARGS(chown16, "%s, %d, %d"), path, args->uid, args->gid);
71 #endif
72 error = kern_chown(td, path, UIO_SYSSPACE, CAST_NOCHG(args->uid),
73 CAST_NOCHG(args->gid));
74 LFREEPATH(path);
75 return (error);
76 }
77
78 int
79 linux_lchown16(struct thread *td, struct linux_lchown16_args *args)
80 {
81 char *path;
82 int error;
83
84 LCONVPATHEXIST(td, args->path, &path);
85
86 #ifdef DEBUG
87 if (ldebug(lchown16))
88 printf(ARGS(lchown16, "%s, %d, %d"), path, args->uid,
89 args->gid);
90 #endif
91 error = kern_lchown(td, path, UIO_SYSSPACE, CAST_NOCHG(args->uid),
92 CAST_NOCHG(args->gid));
93 LFREEPATH(path);
94 return (error);
95 }
96
97 int
98 linux_setgroups16(struct thread *td, struct linux_setgroups16_args *args)
99 {
100 struct ucred *newcred, *oldcred;
101 l_gid16_t *linux_gidset;
102 gid_t *bsd_gidset;
103 int ngrp, error;
104 struct proc *p;
105
106 #ifdef DEBUG
107 if (ldebug(setgroups16))
108 printf(ARGS(setgroups16, "%d, *"), args->gidsetsize);
109 #endif
110
111 ngrp = args->gidsetsize;
112 if (ngrp < 0 || ngrp >= ngroups_max + 1)
113 return (EINVAL);
114 linux_gidset = malloc(ngrp * sizeof(*linux_gidset), M_TEMP, M_WAITOK);
115 error = copyin(args->gidset, linux_gidset, ngrp * sizeof(l_gid16_t));
116 if (error) {
117 free(linux_gidset, M_TEMP);
118 return (error);
119 }
120 newcred = crget();
121 p = td->td_proc;
122 PROC_LOCK(p);
123 oldcred = crcopysafe(p, newcred);
124
125 /*
126 * cr_groups[0] holds egid. Setting the whole set from
127 * the supplied set will cause egid to be changed too.
128 * Keep cr_groups[0] unchanged to prevent that.
129 */
130
131 if ((error = priv_check_cred(oldcred, PRIV_CRED_SETGROUPS, 0)) != 0) {
132 PROC_UNLOCK(p);
133 crfree(newcred);
134 goto out;
135 }
136
137 if (ngrp > 0) {
138 newcred->cr_ngroups = ngrp + 1;
139
140 bsd_gidset = newcred->cr_groups;
141 ngrp--;
142 while (ngrp >= 0) {
143 bsd_gidset[ngrp + 1] = linux_gidset[ngrp];
144 ngrp--;
145 }
146 }
147 else
148 newcred->cr_ngroups = 1;
149
150 setsugid(td->td_proc);
151 p->p_ucred = newcred;
152 PROC_UNLOCK(p);
153 crfree(oldcred);
154 error = 0;
155 out:
156 free(linux_gidset, M_TEMP);
157 return (error);
158 }
159
160 int
161 linux_getgroups16(struct thread *td, struct linux_getgroups16_args *args)
162 {
163 struct ucred *cred;
164 l_gid16_t *linux_gidset;
165 gid_t *bsd_gidset;
166 int bsd_gidsetsz, ngrp, error;
167
168 #ifdef DEBUG
169 if (ldebug(getgroups16))
170 printf(ARGS(getgroups16, "%d, *"), args->gidsetsize);
171 #endif
172
173 cred = td->td_ucred;
174 bsd_gidset = cred->cr_groups;
175 bsd_gidsetsz = cred->cr_ngroups - 1;
176
177 /*
178 * cr_groups[0] holds egid. Returning the whole set
179 * here will cause a duplicate. Exclude cr_groups[0]
180 * to prevent that.
181 */
182
183 if ((ngrp = args->gidsetsize) == 0) {
184 td->td_retval[0] = bsd_gidsetsz;
185 return (0);
186 }
187
188 if (ngrp < bsd_gidsetsz)
189 return (EINVAL);
190
191 ngrp = 0;
192 linux_gidset = malloc(bsd_gidsetsz * sizeof(*linux_gidset),
193 M_TEMP, M_WAITOK);
194 while (ngrp < bsd_gidsetsz) {
195 linux_gidset[ngrp] = bsd_gidset[ngrp + 1];
196 ngrp++;
197 }
198
199 error = copyout(linux_gidset, args->gidset, ngrp * sizeof(l_gid16_t));
200 free(linux_gidset, M_TEMP);
201 if (error)
202 return (error);
203
204 td->td_retval[0] = ngrp;
205 return (0);
206 }
207
208 /*
209 * The FreeBSD native getgid(2) and getuid(2) also modify td->td_retval[1]
210 * when COMPAT_43 is defined. This clobbers registers that are assumed to
211 * be preserved. The following lightweight syscalls fixes this. See also
212 * linux_getpid(2), linux_getgid(2) and linux_getuid(2) in linux_misc.c
213 *
214 * linux_getgid16() - MP SAFE
215 * linux_getuid16() - MP SAFE
216 */
217
218 int
219 linux_getgid16(struct thread *td, struct linux_getgid16_args *args)
220 {
221
222 td->td_retval[0] = td->td_ucred->cr_rgid;
223 return (0);
224 }
225
226 int
227 linux_getuid16(struct thread *td, struct linux_getuid16_args *args)
228 {
229
230 td->td_retval[0] = td->td_ucred->cr_ruid;
231 return (0);
232 }
233
234 int
235 linux_getegid16(struct thread *td, struct linux_getegid16_args *args)
236 {
237 struct getegid_args bsd;
238
239 return (getegid(td, &bsd));
240 }
241
242 int
243 linux_geteuid16(struct thread *td, struct linux_geteuid16_args *args)
244 {
245 struct geteuid_args bsd;
246
247 return (geteuid(td, &bsd));
248 }
249
250 int
251 linux_setgid16(struct thread *td, struct linux_setgid16_args *args)
252 {
253 struct setgid_args bsd;
254
255 bsd.gid = args->gid;
256 return (setgid(td, &bsd));
257 }
258
259 int
260 linux_setuid16(struct thread *td, struct linux_setuid16_args *args)
261 {
262 struct setuid_args bsd;
263
264 bsd.uid = args->uid;
265 return (setuid(td, &bsd));
266 }
267
268 int
269 linux_setregid16(struct thread *td, struct linux_setregid16_args *args)
270 {
271 struct setregid_args bsd;
272
273 bsd.rgid = CAST_NOCHG(args->rgid);
274 bsd.egid = CAST_NOCHG(args->egid);
275 return (setregid(td, &bsd));
276 }
277
278 int
279 linux_setreuid16(struct thread *td, struct linux_setreuid16_args *args)
280 {
281 struct setreuid_args bsd;
282
283 bsd.ruid = CAST_NOCHG(args->ruid);
284 bsd.euid = CAST_NOCHG(args->euid);
285 return (setreuid(td, &bsd));
286 }
287
288 int
289 linux_setresgid16(struct thread *td, struct linux_setresgid16_args *args)
290 {
291 struct setresgid_args bsd;
292
293 bsd.rgid = CAST_NOCHG(args->rgid);
294 bsd.egid = CAST_NOCHG(args->egid);
295 bsd.sgid = CAST_NOCHG(args->sgid);
296 return (setresgid(td, &bsd));
297 }
298
299 int
300 linux_setresuid16(struct thread *td, struct linux_setresuid16_args *args)
301 {
302 struct setresuid_args bsd;
303
304 bsd.ruid = CAST_NOCHG(args->ruid);
305 bsd.euid = CAST_NOCHG(args->euid);
306 bsd.suid = CAST_NOCHG(args->suid);
307 return (setresuid(td, &bsd));
308 }
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