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/7.3/sys/compat/linux/linux_uid16.c 170587 2007-06-12 00:12:01Z rwatson $");
29
30 #include "opt_compat.h"
31
32 #include <sys/param.h>
33 #include <sys/lock.h>
34 #include <sys/malloc.h>
35 #include <sys/mutex.h>
36 #include <sys/priv.h>
37 #include <sys/proc.h>
38 #include <sys/syscallsubr.h>
39 #include <sys/sysproto.h>
40 #include <sys/systm.h>
41
42 #ifdef COMPAT_LINUX32
43 #include <machine/../linux32/linux.h>
44 #include <machine/../linux32/linux32_proto.h>
45 #else
46 #include <machine/../linux/linux.h>
47 #include <machine/../linux/linux_proto.h>
48 #endif
49
50 #include <compat/linux/linux_util.h>
51
52 DUMMY(setfsuid16);
53 DUMMY(setfsgid16);
54 DUMMY(getresuid16);
55 DUMMY(getresgid16);
56
57 #define CAST_NOCHG(x) ((x == 0xFFFF) ? -1 : x)
58
59 int
60 linux_chown16(struct thread *td, struct linux_chown16_args *args)
61 {
62 char *path;
63 int error;
64
65 LCONVPATHEXIST(td, args->path, &path);
66
67 #ifdef DEBUG
68 if (ldebug(chown16))
69 printf(ARGS(chown16, "%s, %d, %d"), path, args->uid, args->gid);
70 #endif
71 error = kern_chown(td, path, UIO_SYSSPACE, CAST_NOCHG(args->uid),
72 CAST_NOCHG(args->gid));
73 LFREEPATH(path);
74 return (error);
75 }
76
77 int
78 linux_lchown16(struct thread *td, struct linux_lchown16_args *args)
79 {
80 char *path;
81 int error;
82
83 LCONVPATHEXIST(td, args->path, &path);
84
85 #ifdef DEBUG
86 if (ldebug(lchown16))
87 printf(ARGS(lchown16, "%s, %d, %d"), path, args->uid,
88 args->gid);
89 #endif
90 error = kern_lchown(td, path, UIO_SYSSPACE, CAST_NOCHG(args->uid),
91 CAST_NOCHG(args->gid));
92 LFREEPATH(path);
93 return (error);
94 }
95
96 int
97 linux_setgroups16(struct thread *td, struct linux_setgroups16_args *args)
98 {
99 struct ucred *newcred, *oldcred;
100 l_gid16_t linux_gidset[NGROUPS];
101 gid_t *bsd_gidset;
102 int ngrp, error;
103 struct proc *p;
104
105 #ifdef DEBUG
106 if (ldebug(setgroups16))
107 printf(ARGS(setgroups16, "%d, *"), args->gidsetsize);
108 #endif
109
110 ngrp = args->gidsetsize;
111 if (ngrp < 0 || ngrp >= NGROUPS)
112 return (EINVAL);
113 error = copyin(args->gidset, linux_gidset, ngrp * sizeof(l_gid16_t));
114 if (error)
115 return (error);
116 newcred = crget();
117 p = td->td_proc;
118 PROC_LOCK(p);
119 oldcred = p->p_ucred;
120
121 /*
122 * cr_groups[0] holds egid. Setting the whole set from
123 * the supplied set will cause egid to be changed too.
124 * Keep cr_groups[0] unchanged to prevent that.
125 */
126
127 if ((error = priv_check_cred(oldcred, PRIV_CRED_SETGROUPS, 0)) != 0) {
128 PROC_UNLOCK(p);
129 crfree(newcred);
130 return (error);
131 }
132
133 crcopy(newcred, oldcred);
134 if (ngrp > 0) {
135 newcred->cr_ngroups = ngrp + 1;
136
137 bsd_gidset = newcred->cr_groups;
138 ngrp--;
139 while (ngrp >= 0) {
140 bsd_gidset[ngrp + 1] = linux_gidset[ngrp];
141 ngrp--;
142 }
143 }
144 else
145 newcred->cr_ngroups = 1;
146
147 setsugid(td->td_proc);
148 p->p_ucred = newcred;
149 PROC_UNLOCK(p);
150 crfree(oldcred);
151 return (0);
152 }
153
154 int
155 linux_getgroups16(struct thread *td, struct linux_getgroups16_args *args)
156 {
157 struct ucred *cred;
158 l_gid16_t linux_gidset[NGROUPS];
159 gid_t *bsd_gidset;
160 int bsd_gidsetsz, ngrp, error;
161
162 #ifdef DEBUG
163 if (ldebug(getgroups16))
164 printf(ARGS(getgroups16, "%d, *"), args->gidsetsize);
165 #endif
166
167 cred = td->td_ucred;
168 bsd_gidset = cred->cr_groups;
169 bsd_gidsetsz = cred->cr_ngroups - 1;
170
171 /*
172 * cr_groups[0] holds egid. Returning the whole set
173 * here will cause a duplicate. Exclude cr_groups[0]
174 * to prevent that.
175 */
176
177 if ((ngrp = args->gidsetsize) == 0) {
178 td->td_retval[0] = bsd_gidsetsz;
179 return (0);
180 }
181
182 if (ngrp < bsd_gidsetsz)
183 return (EINVAL);
184
185 ngrp = 0;
186 while (ngrp < bsd_gidsetsz) {
187 linux_gidset[ngrp] = bsd_gidset[ngrp + 1];
188 ngrp++;
189 }
190
191 error = copyout(linux_gidset, args->gidset, ngrp * sizeof(l_gid16_t));
192 if (error)
193 return (error);
194
195 td->td_retval[0] = ngrp;
196 return (0);
197 }
198
199 /*
200 * The FreeBSD native getgid(2) and getuid(2) also modify td->td_retval[1]
201 * when COMPAT_43 is defined. This clobbers registers that are assumed to
202 * be preserved. The following lightweight syscalls fixes this. See also
203 * linux_getpid(2), linux_getgid(2) and linux_getuid(2) in linux_misc.c
204 *
205 * linux_getgid16() - MP SAFE
206 * linux_getuid16() - MP SAFE
207 */
208
209 int
210 linux_getgid16(struct thread *td, struct linux_getgid16_args *args)
211 {
212
213 td->td_retval[0] = td->td_ucred->cr_rgid;
214 return (0);
215 }
216
217 int
218 linux_getuid16(struct thread *td, struct linux_getuid16_args *args)
219 {
220
221 td->td_retval[0] = td->td_ucred->cr_ruid;
222 return (0);
223 }
224
225 int
226 linux_getegid16(struct thread *td, struct linux_getegid16_args *args)
227 {
228 struct getegid_args bsd;
229
230 return (getegid(td, &bsd));
231 }
232
233 int
234 linux_geteuid16(struct thread *td, struct linux_geteuid16_args *args)
235 {
236 struct geteuid_args bsd;
237
238 return (geteuid(td, &bsd));
239 }
240
241 int
242 linux_setgid16(struct thread *td, struct linux_setgid16_args *args)
243 {
244 struct setgid_args bsd;
245
246 bsd.gid = args->gid;
247 return (setgid(td, &bsd));
248 }
249
250 int
251 linux_setuid16(struct thread *td, struct linux_setuid16_args *args)
252 {
253 struct setuid_args bsd;
254
255 bsd.uid = args->uid;
256 return (setuid(td, &bsd));
257 }
258
259 int
260 linux_setregid16(struct thread *td, struct linux_setregid16_args *args)
261 {
262 struct setregid_args bsd;
263
264 bsd.rgid = CAST_NOCHG(args->rgid);
265 bsd.egid = CAST_NOCHG(args->egid);
266 return (setregid(td, &bsd));
267 }
268
269 int
270 linux_setreuid16(struct thread *td, struct linux_setreuid16_args *args)
271 {
272 struct setreuid_args bsd;
273
274 bsd.ruid = CAST_NOCHG(args->ruid);
275 bsd.euid = CAST_NOCHG(args->euid);
276 return (setreuid(td, &bsd));
277 }
278
279 int
280 linux_setresgid16(struct thread *td, struct linux_setresgid16_args *args)
281 {
282 struct setresgid_args bsd;
283
284 bsd.rgid = CAST_NOCHG(args->rgid);
285 bsd.egid = CAST_NOCHG(args->egid);
286 bsd.sgid = CAST_NOCHG(args->sgid);
287 return (setresgid(td, &bsd));
288 }
289
290 int
291 linux_setresuid16(struct thread *td, struct linux_setresuid16_args *args)
292 {
293 struct setresuid_args bsd;
294
295 bsd.ruid = CAST_NOCHG(args->ruid);
296 bsd.euid = CAST_NOCHG(args->euid);
297 bsd.suid = CAST_NOCHG(args->suid);
298 return (setresuid(td, &bsd));
299 }
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