xref: /titanic_41/usr/src/uts/common/syscall/chown.c (revision b64bfe7dc77dc5c5561cdcd10c80b0b550701a24)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright (c) 1994, 2010, Oracle and/or its affiliates. All rights reserved.
24  */
25 
26 /*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
27 /*	  All Rights Reserved  	*/
28 
29 /*
30  * Portions of this source code were derived from Berkeley 4.3 BSD
31  * under license from the Regents of the University of California.
32  */
33 
34 #include <sys/param.h>
35 #include <sys/isa_defs.h>
36 #include <sys/types.h>
37 #include <sys/sysmacros.h>
38 #include <sys/systm.h>
39 #include <sys/errno.h>
40 #include <sys/fcntl.h>
41 #include <sys/pathname.h>
42 #include <sys/var.h>
43 #include <sys/vfs.h>
44 #include <sys/vnode.h>
45 #include <sys/file.h>
46 #include <sys/mode.h>
47 #include <sys/proc.h>
48 #include <sys/uio.h>
49 #include <sys/filio.h>
50 #include <sys/fcntl.h>
51 #include <sys/debug.h>
52 #include <c2/audit.h>
53 
54 /*
55  * Change ownership of file.
56  */
57 int
58 fchownat(int fd, char *name, uid_t uid, gid_t gid, int flags)
59 {
60 	vnode_t		*startvp, *vp;
61 	file_t 		*filefp;
62 	struct vattr 	vattr;
63 	int 		error = 0;
64 	char 		startchar;
65 	struct zone	*zone = crgetzone(CRED());
66 
67 	if (uid != (uid_t)-1 && !VALID_UID(uid, zone) ||
68 	    gid != (gid_t)-1 && !VALID_GID(gid, zone)) {
69 		return (set_errno(EINVAL));
70 	}
71 	vattr.va_uid = uid;
72 	vattr.va_gid = gid;
73 	vattr.va_mask = 0;
74 	if (vattr.va_uid != -1)
75 		vattr.va_mask |= AT_UID;
76 	if (vattr.va_gid != -1)
77 		vattr.va_mask |= AT_GID;
78 
79 
80 	if (fd == AT_FDCWD && name == NULL)
81 		return (set_errno(EFAULT));
82 
83 	if (name != NULL) {
84 		if (copyin(name, &startchar, sizeof (char)))
85 			return (set_errno(EFAULT));
86 	} else {
87 		startchar = '\0';
88 	}
89 
90 
91 	if (fd == AT_FDCWD)
92 		startvp = NULL;
93 	else {
94 		/*
95 		 * only get fd if not doing absolute lookup
96 		 */
97 		if (startchar != '/') {
98 			if ((filefp = getf(fd)) == NULL)
99 				return (set_errno(EBADF));
100 			startvp = filefp->f_vnode;
101 			VN_HOLD(startvp);
102 			releasef(fd);
103 		} else {
104 			startvp = NULL;
105 		}
106 	}
107 
108 	if (AU_AUDITING() && (startvp != NULL))
109 		audit_setfsat_path(1);
110 
111 	/*
112 	 * Do lookup for fchownat when name not NULL
113 	 */
114 	if (name != NULL) {
115 		if (error = lookupnameat(name, UIO_USERSPACE,
116 		    (flags == AT_SYMLINK_NOFOLLOW) ?
117 		    NO_FOLLOW : FOLLOW,
118 		    NULLVPP, &vp, startvp)) {
119 			if (startvp != NULL)
120 				VN_RELE(startvp);
121 			return (set_errno(error));
122 		}
123 	} else {
124 		vp = startvp;
125 		ASSERT(vp);
126 		VN_HOLD(vp);
127 	}
128 
129 	if (vn_is_readonly(vp)) {
130 		error = EROFS;
131 	} else {
132 		error = VOP_SETATTR(vp, &vattr, 0, CRED(), NULL);
133 	}
134 
135 	if (startvp != NULL)
136 		VN_RELE(startvp);
137 	if (vp != NULL)
138 		VN_RELE(vp);
139 
140 	if (error != 0)
141 		return (set_errno(error));
142 	else
143 		return (error);
144 }
145 
146 int
147 chown(char *fname, uid_t uid, gid_t gid)
148 {
149 	return (fchownat(AT_FDCWD, fname, uid, gid, 0));
150 }
151 
152 int
153 lchown(char *fname, uid_t uid, gid_t gid)
154 {
155 	return (fchownat(AT_FDCWD, fname, uid, gid, AT_SYMLINK_NOFOLLOW));
156 }
157 
158 int
159 fchown(int fd, uid_t uid, uid_t gid)
160 {
161 	return (fchownat(fd, NULL, uid, gid, 0));
162 }
163