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 2006 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 29 #include <unistd.h> 30 #include <strings.h> 31 #include <limits.h> 32 #include <dlfcn.h> 33 #include "_conv.h" 34 #include "lddstub_msg.h" 35 36 static int 37 originlddstub(char *buffer, const char *orgfile) 38 { 39 int len; 40 41 if (dlinfo(RTLD_SELF, RTLD_DI_ORIGIN, (void *)buffer) == -1) 42 return (-1); 43 if (strlcat(buffer, orgfile, PATH_MAX) >= PATH_MAX) 44 return (-1); 45 if ((len = resolvepath(buffer, buffer, (PATH_MAX - 1))) == -1) 46 return (-1); 47 buffer[len] = '\0'; 48 if (access(buffer, X_OK) == -1) 49 return (-1); 50 51 return (1); 52 } 53 54 static char orgstub[PATH_MAX], orgstub64[PATH_MAX]; 55 static int orgflag, orgflag64; 56 57 /* 58 * Determine what lddstub to run. 59 */ 60 const char * 61 conv_lddstub(int class) 62 { 63 const char *stub; 64 65 /* 66 * Establish defaults. 67 */ 68 if (class == ELFCLASS32) 69 stub = MSG_ORIG(MSG_PTH_LDDSTUB); 70 else 71 stub = MSG_ORIG(MSG_PTH_LDDSTUB_64); 72 73 /* 74 * Provided we're not secure, determine lddstub's location from our 75 * own origin. 76 */ 77 if (geteuid()) { 78 if ((class == ELFCLASS32) && (orgflag != -1)) { 79 if (orgflag == 0) { 80 if ((orgflag = originlddstub(orgstub, 81 MSG_ORIG(MSG_ORG_LDDSTUB))) == -1) 82 return (stub); 83 } 84 stub = (const char *)orgstub; 85 } 86 if ((class == ELFCLASS64) && (orgflag64 != -1)) { 87 if (orgflag64 == 0) { 88 if ((orgflag64 = originlddstub(orgstub64, 89 MSG_ORIG(MSG_ORG_LDDSTUB_64))) == -1) 90 return (stub); 91 } 92 stub = (const char *)orgstub64; 93 } 94 } 95 return (stub); 96 } 97