linux_uid16.c revision 156874 
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: head/sys/compat/linux/linux_uid16.c 156874 2006-03-19 11:10:33Z ru $");
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/proc.h>
37#include <sys/syscallsubr.h>
38#include <sys/sysproto.h>
39#include <sys/systm.h>
40
41#ifdef COMPAT_LINUX32
42#include <machine/../linux32/linux.h>
43#include <machine/../linux32/linux32_proto.h>
44#else
45#include <machine/../linux/linux.h>
46#include <machine/../linux/linux_proto.h>
47#endif
48
49#include <compat/linux/linux_util.h>
50
51DUMMY(setfsuid16);
52DUMMY(setfsgid16);
53DUMMY(getresuid16);
54DUMMY(getresgid16);
55
56#define	CAST_NOCHG(x)	((x == 0xFFFF) ? -1 : x)
57
58int
59linux_chown16(struct thread *td, struct linux_chown16_args *args)
60{
61	char *path;
62	int error;
63
64	LCONVPATHEXIST(td, args->path, &path);
65
66#ifdef DEBUG
67	if (ldebug(chown16))
68		printf(ARGS(chown16, "%s, %d, %d"), path, args->uid, args->gid);
69#endif
70	error = kern_chown(td, path, UIO_SYSSPACE, CAST_NOCHG(args->uid),
71	    CAST_NOCHG(args->gid));
72	LFREEPATH(path);
73	return (error);
74}
75
76int
77linux_lchown16(struct thread *td, struct linux_lchown16_args *args)
78{
79	char *path;
80	int error;
81
82	LCONVPATHEXIST(td, args->path, &path);
83
84#ifdef DEBUG
85	if (ldebug(lchown16))
86		printf(ARGS(lchown16, "%s, %d, %d"), path, args->uid,
87		    args->gid);
88#endif
89	error = kern_lchown(td, path, UIO_SYSSPACE, CAST_NOCHG(args->uid),
90	    CAST_NOCHG(args->gid));
91	LFREEPATH(path);
92	return (error);
93}
94
95int
96linux_setgroups16(struct thread *td, struct linux_setgroups16_args *args)
97{
98	struct ucred *newcred, *oldcred;
99	l_gid16_t linux_gidset[NGROUPS];
100	gid_t *bsd_gidset;
101	int ngrp, error;
102	struct proc *p;
103
104#ifdef DEBUG
105	if (ldebug(setgroups16))
106		printf(ARGS(setgroups16, "%d, *"), args->gidsetsize);
107#endif
108
109	ngrp = args->gidsetsize;
110	if (ngrp < 0 || ngrp >= NGROUPS)
111		return (EINVAL);
112	error = copyin(args->gidset, linux_gidset, ngrp * sizeof(l_gid16_t));
113	if (error)
114		return (error);
115	newcred = crget();
116	p = td->td_proc;
117	PROC_LOCK(p);
118	oldcred = p->p_ucred;
119
120	/*
121	 * cr_groups[0] holds egid. Setting the whole set from
122	 * the supplied set will cause egid to be changed too.
123	 * Keep cr_groups[0] unchanged to prevent that.
124	 */
125
126	if ((error = suser_cred(oldcred, SUSER_ALLOWJAIL)) != 0) {
127		PROC_UNLOCK(p);
128		crfree(newcred);
129		return (error);
130	}
131
132	crcopy(newcred, oldcred);
133	if (ngrp > 0) {
134		newcred->cr_ngroups = ngrp + 1;
135
136		bsd_gidset = newcred->cr_groups;
137		ngrp--;
138		while (ngrp >= 0) {
139			bsd_gidset[ngrp + 1] = linux_gidset[ngrp];
140			ngrp--;
141		}
142	}
143	else
144		newcred->cr_ngroups = 1;
145
146	setsugid(td->td_proc);
147	p->p_ucred = newcred;
148	PROC_UNLOCK(p);
149	crfree(oldcred);
150	return (0);
151}
152
153int
154linux_getgroups16(struct thread *td, struct linux_getgroups16_args *args)
155{
156	struct ucred *cred;
157	l_gid16_t linux_gidset[NGROUPS];
158	gid_t *bsd_gidset;
159	int bsd_gidsetsz, ngrp, error;
160
161#ifdef DEBUG
162	if (ldebug(getgroups16))
163		printf(ARGS(getgroups16, "%d, *"), args->gidsetsize);
164#endif
165
166	cred = td->td_ucred;
167	bsd_gidset = cred->cr_groups;
168	bsd_gidsetsz = cred->cr_ngroups - 1;
169
170	/*
171	 * cr_groups[0] holds egid. Returning the whole set
172	 * here will cause a duplicate. Exclude cr_groups[0]
173	 * to prevent that.
174	 */
175
176	if ((ngrp = args->gidsetsize) == 0) {
177		td->td_retval[0] = bsd_gidsetsz;
178		return (0);
179	}
180
181	if (ngrp < bsd_gidsetsz)
182		return (EINVAL);
183
184	ngrp = 0;
185	while (ngrp < bsd_gidsetsz) {
186		linux_gidset[ngrp] = bsd_gidset[ngrp + 1];
187		ngrp++;
188	}
189
190	error = copyout(linux_gidset, args->gidset, ngrp * sizeof(l_gid16_t));
191	if (error)
192		return (error);
193
194	td->td_retval[0] = ngrp;
195	return (0);
196}
197
198/*
199 * The FreeBSD native getgid(2) and getuid(2) also modify td->td_retval[1]
200 * when COMPAT_43 is defined. This globbers registers that
201 * are assumed to be preserved. The following lightweight syscalls fixes
202 * this. See also linux_getpid(2), linux_getgid(2) and linux_getuid(2) in
203 * linux_misc.c
204 *
205 * linux_getgid16() - MP SAFE
206 * linux_getuid16() - MP SAFE
207 */
208
209int
210linux_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
217int
218linux_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
225int
226linux_getegid16(struct thread *td, struct linux_getegid16_args *args)
227{
228	struct getegid_args bsd;
229
230	return (getegid(td, &bsd));
231}
232
233int
234linux_geteuid16(struct thread *td, struct linux_geteuid16_args *args)
235{
236	struct geteuid_args bsd;
237
238	return (geteuid(td, &bsd));
239}
240
241int
242linux_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
250int
251linux_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
259int
260linux_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
269int
270linux_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
279int
280linux_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
290int
291linux_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}
300