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 * $FreeBSD: releng/5.1/sys/compat/linux/linux_uid16.c 111797 2003-03-03 09:14:26Z des $
27 */
28
29 #include <sys/param.h>
30 #include <sys/lock.h>
31 #include <sys/malloc.h>
32 #include <sys/mutex.h>
33 #include <sys/proc.h>
34 #include <sys/syscallsubr.h>
35 #include <sys/sysproto.h>
36 #include <sys/systm.h>
37
38 #include <machine/../linux/linux.h>
39 #include <machine/../linux/linux_proto.h>
40
41 #include <compat/linux/linux_util.h>
42
43 DUMMY(setfsuid16);
44 DUMMY(setfsgid16);
45 DUMMY(getresuid16);
46 DUMMY(getresgid16);
47
48 #define CAST_NOCHG(x) ((x == 0xFFFF) ? -1 : x)
49
50 int
51 linux_chown16(struct thread *td, struct linux_chown16_args *args)
52 {
53 char *path;
54 int error;
55
56 LCONVPATHEXIST(td, args->path, &path);
57
58 #ifdef DEBUG
59 if (ldebug(chown16))
60 printf(ARGS(chown16, "%s, %d, %d"), path, args->uid, args->gid);
61 #endif
62 error = kern_chown(td, path, UIO_SYSSPACE, CAST_NOCHG(args->uid),
63 CAST_NOCHG(args->gid));
64 LFREEPATH(path);
65 return (error);
66 }
67
68 int
69 linux_lchown16(struct thread *td, struct linux_lchown16_args *args)
70 {
71 char *path;
72 int error;
73
74 LCONVPATHEXIST(td, args->path, &path);
75
76 #ifdef DEBUG
77 if (ldebug(lchown16))
78 printf(ARGS(lchown16, "%s, %d, %d"), path, args->uid,
79 args->gid);
80 #endif
81 error = kern_lchown(td, path, UIO_SYSSPACE, CAST_NOCHG(args->uid),
82 CAST_NOCHG(args->gid));
83 LFREEPATH(path);
84 return (error);
85 }
86
87 int
88 linux_setgroups16(struct thread *td, struct linux_setgroups16_args *args)
89 {
90 struct ucred *newcred, *oldcred;
91 l_gid16_t linux_gidset[NGROUPS];
92 gid_t *bsd_gidset;
93 int ngrp, error;
94 struct proc *p;
95
96 #ifdef DEBUG
97 if (ldebug(setgroups16))
98 printf(ARGS(setgroups16, "%d, *"), args->gidsetsize);
99 #endif
100
101 ngrp = args->gidsetsize;
102 if (ngrp >= NGROUPS)
103 return (EINVAL);
104 error = copyin(args->gidset, linux_gidset, ngrp * sizeof(l_gid16_t));
105 if (error)
106 return (error);
107 newcred = crget();
108 p = td->td_proc;
109 PROC_LOCK(p);
110 oldcred = p->p_ucred;
111
112 /*
113 * cr_groups[0] holds egid. Setting the whole set from
114 * the supplied set will cause egid to be changed too.
115 * Keep cr_groups[0] unchanged to prevent that.
116 */
117
118 if ((error = suser_cred(oldcred, PRISON_ROOT)) != 0) {
119 PROC_UNLOCK(p);
120 crfree(newcred);
121 return (error);
122 }
123
124 crcopy(newcred, oldcred);
125 if (ngrp > 0) {
126 newcred->cr_ngroups = ngrp + 1;
127
128 bsd_gidset = newcred->cr_groups;
129 ngrp--;
130 while (ngrp >= 0) {
131 bsd_gidset[ngrp + 1] = linux_gidset[ngrp];
132 ngrp--;
133 }
134 }
135 else
136 newcred->cr_ngroups = 1;
137
138 setsugid(td->td_proc);
139 p->p_ucred = newcred;
140 PROC_UNLOCK(p);
141 crfree(oldcred);
142 return (0);
143 }
144
145 int
146 linux_getgroups16(struct thread *td, struct linux_getgroups16_args *args)
147 {
148 struct ucred *cred;
149 l_gid16_t linux_gidset[NGROUPS];
150 gid_t *bsd_gidset;
151 int bsd_gidsetsz, ngrp, error;
152
153 #ifdef DEBUG
154 if (ldebug(getgroups16))
155 printf(ARGS(getgroups16, "%d, *"), args->gidsetsize);
156 #endif
157
158 cred = td->td_ucred;
159 bsd_gidset = cred->cr_groups;
160 bsd_gidsetsz = cred->cr_ngroups - 1;
161
162 /*
163 * cr_groups[0] holds egid. Returning the whole set
164 * here will cause a duplicate. Exclude cr_groups[0]
165 * to prevent that.
166 */
167
168 if ((ngrp = args->gidsetsize) == 0) {
169 td->td_retval[0] = bsd_gidsetsz;
170 return (0);
171 }
172
173 if (ngrp < bsd_gidsetsz)
174 return (EINVAL);
175
176 ngrp = 0;
177 while (ngrp < bsd_gidsetsz) {
178 linux_gidset[ngrp] = bsd_gidset[ngrp + 1];
179 ngrp++;
180 }
181
182 error = copyout(linux_gidset, args->gidset, ngrp * sizeof(l_gid16_t));
183 if (error)
184 return (error);
185
186 td->td_retval[0] = ngrp;
187 return (0);
188 }
189
190 /*
191 * The FreeBSD native getgid(2) and getuid(2) also modify td->td_retval[1]
192 * when COMPAT_43 or COMPAT_SUNOS is defined. This globbers registers that
193 * are assumed to be preserved. The following lightweight syscalls fixes
194 * this. See also linux_getpid(2), linux_getgid(2) and linux_getuid(2) in
195 * linux_misc.c
196 *
197 * linux_getgid16() - MP SAFE
198 * linux_getuid16() - MP SAFE
199 */
200
201 int
202 linux_getgid16(struct thread *td, struct linux_getgid16_args *args)
203 {
204
205 td->td_retval[0] = td->td_ucred->cr_rgid;
206 return (0);
207 }
208
209 int
210 linux_getuid16(struct thread *td, struct linux_getuid16_args *args)
211 {
212
213 td->td_retval[0] = td->td_ucred->cr_ruid;
214 return (0);
215 }
216
217 int
218 linux_getegid16(struct thread *td, struct linux_getegid16_args *args)
219 {
220 struct getegid_args bsd;
221
222 return (getegid(td, &bsd));
223 }
224
225 int
226 linux_geteuid16(struct thread *td, struct linux_geteuid16_args *args)
227 {
228 struct geteuid_args bsd;
229
230 return (geteuid(td, &bsd));
231 }
232
233 int
234 linux_setgid16(struct thread *td, struct linux_setgid16_args *args)
235 {
236 struct setgid_args bsd;
237
238 bsd.gid = args->gid;
239 return (setgid(td, &bsd));
240 }
241
242 int
243 linux_setuid16(struct thread *td, struct linux_setuid16_args *args)
244 {
245 struct setuid_args bsd;
246
247 bsd.uid = args->uid;
248 return (setuid(td, &bsd));
249 }
250
251 int
252 linux_setregid16(struct thread *td, struct linux_setregid16_args *args)
253 {
254 struct setregid_args bsd;
255
256 bsd.rgid = CAST_NOCHG(args->rgid);
257 bsd.egid = CAST_NOCHG(args->egid);
258 return (setregid(td, &bsd));
259 }
260
261 int
262 linux_setreuid16(struct thread *td, struct linux_setreuid16_args *args)
263 {
264 struct setreuid_args bsd;
265
266 bsd.ruid = CAST_NOCHG(args->ruid);
267 bsd.euid = CAST_NOCHG(args->euid);
268 return (setreuid(td, &bsd));
269 }
270
271 int
272 linux_setresgid16(struct thread *td, struct linux_setresgid16_args *args)
273 {
274 struct setresgid_args bsd;
275
276 bsd.rgid = CAST_NOCHG(args->rgid);
277 bsd.egid = CAST_NOCHG(args->egid);
278 bsd.sgid = CAST_NOCHG(args->sgid);
279 return (setresgid(td, &bsd));
280 }
281
282 int
283 linux_setresuid16(struct thread *td, struct linux_setresuid16_args *args)
284 {
285 struct setresuid_args bsd;
286
287 bsd.ruid = CAST_NOCHG(args->ruid);
288 bsd.euid = CAST_NOCHG(args->euid);
289 bsd.suid = CAST_NOCHG(args->suid);
290 return (setresuid(td, &bsd));
291 }
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