usr/src/cmd/sgs/libconv/common/lddstub.c

   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
  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 *
  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 }