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 2009 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #include <unistd.h>
28 #include <strings.h>
29 #include <limits.h>
30 #include <dlfcn.h>
31 #include "_conv.h"
32 #include "lddstub_msg.h"
33
34 static int
originlddstub(char * buffer,const char * orgfile)35 originlddstub(char *buffer, const char *orgfile)
36 {
37 int len;
38
39 if (dlinfo(RTLD_SELF, RTLD_DI_ORIGIN, (void *)buffer) == -1)
40 return (-1);
41 if (strlcat(buffer, orgfile, PATH_MAX) >= PATH_MAX)
42 return (-1);
43 if ((len = resolvepath(buffer, buffer, (PATH_MAX - 1))) == -1)
44 return (-1);
45 buffer[len] = '\0';
46 if (access(buffer, X_OK) == -1)
47 return (-1);
48
49 return (1);
50 }
51
52 static char orgstub[PATH_MAX], orgstub64[PATH_MAX];
53 static int orgflag, orgflag64;
54
55 /*
56 * Determine what lddstub to run.
57 */
58 const char *
conv_lddstub(int class)59 conv_lddstub(int class)
60 {
61 const char *stub;
62
63 /*
64 * Establish defaults.
65 */
66 if (class == ELFCLASS32)
67 stub = MSG_ORIG(MSG_PTH_LDDSTUB);
68 else
69 stub = MSG_ORIG(MSG_PTH_LDDSTUB_64);
70
71 /*
72 * Provided we're not secure, determine lddstub's location from our
73 * own origin.
74 */
75 if (geteuid()) {
76 if ((class == ELFCLASS32) && (orgflag != -1)) {
77 if (orgflag == 0) {
78 /* BEGIN CSTYLED */
79 if ((orgflag = originlddstub(orgstub,
80 #ifdef _LP64
81 MSG_ORIG(MSG_ORG_64LDD_32STUB))) == -1)
82 #else
83 MSG_ORIG(MSG_ORG_32LDD_32STUB))) == -1)
84 #endif
85 return (stub);
86 /* END CSTYLED */
87 }
88 stub = (const char *)orgstub;
89 }
90 if ((class == ELFCLASS64) && (orgflag64 != -1)) {
91 if (orgflag64 == 0) {
92 /* BEGIN CSTYLED */
93 if ((orgflag64 = originlddstub(orgstub64,
94 #ifdef _LP64
95 MSG_ORIG(MSG_ORG_64LDD_64STUB))) == -1)
96 #else
97 MSG_ORIG(MSG_ORG_32LDD_64STUB))) == -1)
98 #endif
99 return (stub);
100 /* END CSTYLED */
101 }
102 stub = (const char *)orgstub64;
103 }
104 }
105 return (stub);
106 }
107