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) 1988 AT&T 24 * All Rights Reserved 25 * 26 * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 27 * Use is subject to license terms. 28 */ 29 30 #include <sys/types.h> 31 #include <sys/mman.h> 32 #include <signal.h> 33 #include <dlfcn.h> 34 #include <synch.h> 35 #include <debug.h> 36 #include "_rtld.h" 37 38 /* 39 * Declarations of global variables used in ld.so. 40 */ 41 Rt_lock rtldlock; 42 int thr_flg_nolock = 0; 43 int thr_flg_reenter = 0; 44 45 /* 46 * Major link-map lists. 47 */ 48 Lm_list lml_main = { 0 }; /* the `main's link map list */ 49 Lm_list lml_rtld = { 0 }; /* rtld's link map list */ 50 51 /* 52 * Entrance count. Each time ld.so.1 is entered following initial process 53 * setup, this count is bumped. This value serves to identify the present 54 * ld.so.1 operation. 55 * 56 * An ld.so.1 operation can result in many symbol lookup requests (i.e., loading 57 * objects and relocating all symbolic bindings). This count is used to protect 58 * against attempting to re-load a failed lazy load within a single call to 59 * ld.so.1, while allowing such attempts across calls. Should a lazy load fail, 60 * the present operation identifier is saved in the current symbol lookup data 61 * block (Slookup). Should a lazy load fall back operation be triggered, the 62 * identifier in the symbol lookup block is compared to the current ld.so.1 63 * entry count, and if the two are equal the fall back is skipped. 64 * 65 * With this count, there is a danger of wrap-around, although as an unsigned 66 * 32-bit value, it is highly unlikely that any application could usefully make 67 * 4.3 giga-calls into ld.so.1. The worst that can occur is that a fall back 68 * lazy load isn't triggered. However, most lazy loads that fail typically 69 * continue to fail unless the user takes corrective action (adds the necessary 70 * (fixed) dependencies to the system). 71 */ 72 ulong_t ld_entry_cnt = 1; 73 74 /* 75 * BEGIN: Exposed to rtld_db, don't change without a coordinated handshake with 76 * librtld_db (remembering that librtld_db must be able to read old as well as 77 * current core files). 78 */ 79 APlist *dynlm_list = NULL; /* dynamic list of link-maps */ 80 /* 81 * END: Exposed to rtld_db 82 */ 83 84 Reglist *reglist = NULL; /* list of register symbols */ 85 86 /* 87 * Set of integers to track how many of what type of PLT's have been bound. 88 * This is only really interesting for SPARC since ia32 has only one PLT. 89 */ 90 uint32_t pltcnt21d = 0; 91 uint32_t pltcnt24d = 0; 92 uint32_t pltcntu32 = 0; 93 uint32_t pltcntu44 = 0; 94 uint32_t pltcntfull = 0; 95 uint32_t pltcntfar = 0; 96 97 /* 98 * AVL tree pointers. 99 */ 100 avl_tree_t *capavl = NULL; /* capabilities files */ 101 avl_tree_t *nfavl = NULL; /* not-found path names */ 102 avl_tree_t *spavl = NULL; /* secure path names */ 103 104 /* 105 * Various other global data. 106 */ 107 uint_t rtld_flags = 0; 108 uint_t rtld_flags2 = 0; 109 110 Lc_desc glcs[CI_MAX]; /* global external interfaces */ 111 112 const char *procname = NULL; 113 const char *rtldname = MSG_ORIG(MSG_FIL_RTLD); 114 115 char *lasterr = NULL; /* string describing last error */ 116 /* cleared by each dlerror() */ 117 Interp *interp = NULL; /* ELF interpreter info */ 118 APlist *hdl_alp[HDLIST_SZ+2]; /* dlopen() handle list */ 119 size_t syspagsz = 0; /* system page size */ 120 ulong_t at_flags = 0; /* machine specific file flags */ 121 Uts_desc *uts = NULL; /* utsname descriptor */ 122 Isa_desc *isa = NULL; /* isalist descriptor */ 123 124 uint_t audit_argcnt = 64; /* no. of stack args to copy (default */ 125 /* is all) */ 126 Audit_desc *auditors = NULL; /* global auditors (LD_AUDIT) */ 127 128 const char *rpl_audit = NULL; /* replaceable LD_AUDIT string */ 129 const char *rpl_debug = NULL; /* replaceable LD_DEBUG string */ 130 const char *rpl_ldflags = NULL; /* replaceable LD_FLAGS string */ 131 const char *rpl_libpath = NULL; /* replaceable LD_LIBRARY_PATH string */ 132 Alist *rpl_libdirs = NULL; /* and associated Pdesc list */ 133 const char *rpl_preload = NULL; /* replaceable LD_PRELOAD string */ 134 135 const char *prm_audit = NULL; /* permanent LD_AUDIT string */ 136 const char *prm_debug = NULL; /* permanent LD_DEBUG string */ 137 const char *prm_ldflags = NULL; /* permanent LD_FLAGS string */ 138 const char *prm_libpath = NULL; /* permanent LD_LIBRARY_PATH string */ 139 Alist *prm_libdirs = NULL; /* and associated Pdesc list */ 140 const char *prm_preload = NULL; /* permanent LD_PRELOAD string */ 141 142 uint_t env_info = 0; /* information regarding environment */ 143 /* variables */ 144 int killsig = SIGKILL; /* signal sent on fatal exit */ 145 APlist *free_alp = NULL; /* defragmentation list */ 146 147 /* 148 * Capabilities are provided by the system. However, users can define an 149 * alternative set of system capabilities, where they can add, subtract, or 150 * override the system capabilities for testing purposes. Furthermore, these 151 * alternative capabilities can be specified such that they only apply to 152 * specified files rather than to all objects. 153 */ 154 static Syscapset scapset = { 0 }; 155 Syscapset *org_scapset = &scapset; /* original system and */ 156 Syscapset *alt_scapset = &scapset; /* alternative system */ 157 /* capabilities */ 158 159 const char *rpl_hwcap = NULL; /* replaceable hwcap str */ 160 const char *rpl_sfcap = NULL; /* replaceable sfcap str */ 161 const char *rpl_machcap = NULL; /* replaceable machcap str */ 162 const char *rpl_platcap = NULL; /* replaceable platcap str */ 163 const char *rpl_cap_files = NULL; /* associated files */ 164 165 const char *prm_hwcap = NULL; /* permanent hwcap str */ 166 const char *prm_sfcap = NULL; /* permanent sfcap str */ 167 const char *prm_machcap = NULL; /* permanent machcap str */ 168 const char *prm_platcap = NULL; /* permanent platcap str */ 169 const char *prm_cap_files = NULL; /* associated files */ 170 171 /* 172 * Note, the debugging descriptor interposes on the default definition provided 173 * by liblddbg. This is required as ld.so.1 must only have outstanding relative 174 * relocations. 175 */ 176 static Dbg_desc _dbg_desc = {0, 0, 0}; 177 Dbg_desc *dbg_desc = &_dbg_desc; /* debugging descriptor */ 178 const char *dbg_file = NULL; /* debugging directed to file */ 179 180 #pragma weak environ = _environ /* environ for PLT tracing - we */ 181 char **_environ = NULL; /* supply the pair to satisfy any */ 182 /* libc requirements (hwmuldiv) */ 183 184 const char *profile_name = NULL; /* object being profiled */ 185 const char *profile_out = NULL; /* profile output file */ 186 const char *profile_lib = NULL; /* audit library to perform profile */ 187 188 uchar_t search_rules[] = { /* dependency search rules */ 189 RPLENV, /* replaceable LD_LIBRARY_PATH */ 190 PRMENV, /* permanent LD_LIBRARY_PATH */ 191 RUNPATH, /* callers runpath */ 192 DEFAULT, /* default library path */ 193 0 194 }; 195 196 Dl_argsinfo argsinfo = { 0 }; /* process argument, environment and */ 197 /* auxv information. */ 198 199 /* 200 * Frequently used messages are cached here to reduce _dgettext() overhead and 201 * also provide for resetting should the locale change (see _ld_libc()). 202 */ 203 const char *err_strs[ERR_NUM] = { NULL }; 204 const char *nosym_str = NULL; 205 206 207 /* 208 * Rejection error message tables. 209 */ 210 const Msg 211 ldd_reject[] = { 212 MSG_STR_EMPTY, 213 MSG_LDD_REJ_MACH, /* MSG_INTL(MSG_LDD_REJ_MACH) */ 214 MSG_LDD_REJ_CLASS, /* MSG_INTL(MSG_LDD_REJ_CLASS) */ 215 MSG_LDD_REJ_DATA, /* MSG_INTL(MSG_LDD_REJ_DATA) */ 216 MSG_LDD_REJ_TYPE, /* MSG_INTL(MSG_LDD_REJ_TYPE) */ 217 MSG_LDD_REJ_BADFLAG, /* MSG_INTL(MSG_LDD_REJ_BADFLAG) */ 218 MSG_LDD_REJ_MISFLAG, /* MSG_INTL(MSG_LDD_REJ_MISFLAG) */ 219 MSG_LDD_REJ_VERSION, /* MSG_INTL(MSG_LDD_REJ_VERSION) */ 220 MSG_LDD_REJ_HAL, /* MSG_INTL(MSG_LDD_REJ_HAL) */ 221 MSG_LDD_REJ_US3, /* MSG_INTL(MSG_LDD_REJ_US3) */ 222 MSG_LDD_REJ_STR, /* MSG_INTL(MSG_LDD_REJ_STR) */ 223 MSG_LDD_REJ_UNKFILE, /* MSG_INTL(MSG_LDD_REJ_UNKFILE) */ 224 MSG_LDD_REJ_UNKCAP, /* MSG_INTL(MSG_LDD_REJ_UNKCAP) */ 225 MSG_LDD_REJ_HWCAP_1, /* MSG_INTL(MSG_LDD_REJ_HWCAP_1) */ 226 MSG_LDD_REJ_SFCAP_1, /* MSG_INTL(MSG_LDD_REJ_SFCAP_1) */ 227 MSG_LDD_REJ_MACHCAP, /* MSG_INTL(MSG_LDD_REJ_MACHCAP) */ 228 MSG_LDD_REJ_PLATCAP, /* MSG_INTL(MSG_LDD_REJ_PLATCAP) */ 229 MSG_LDD_REJ_HWCAP_2 /* MSG_INTL(MSG_LDD_REJ_HWCAP_2) */ 230 }; 231 232 const Msg 233 err_reject[] = { 234 MSG_STR_EMPTY, 235 MSG_ERR_REJ_MACH, /* MSG_INTL(MSG_ERR_REJ_MACH) */ 236 MSG_ERR_REJ_CLASS, /* MSG_INTL(MSG_ERR_REJ_CLASS) */ 237 MSG_ERR_REJ_DATA, /* MSG_INTL(MSG_ERR_REJ_DATA) */ 238 MSG_ERR_REJ_TYPE, /* MSG_INTL(MSG_ERR_REJ_TYPE) */ 239 MSG_ERR_REJ_BADFLAG, /* MSG_INTL(MSG_ERR_REJ_BADFLAG) */ 240 MSG_ERR_REJ_MISFLAG, /* MSG_INTL(MSG_ERR_REJ_MISFLAG) */ 241 MSG_ERR_REJ_VERSION, /* MSG_INTL(MSG_ERR_REJ_VERSION) */ 242 MSG_ERR_REJ_HAL, /* MSG_INTL(MSG_ERR_REJ_HAL) */ 243 MSG_ERR_REJ_US3, /* MSG_INTL(MSG_ERR_REJ_US3) */ 244 MSG_ERR_REJ_STR, /* MSG_INTL(MSG_ERR_REJ_STR) */ 245 MSG_ERR_REJ_UNKFILE, /* MSG_INTL(MSG_ERR_REJ_UNKFILE) */ 246 MSG_ERR_REJ_UNKCAP, /* MSG_INTL(MSG_ERR_REJ_UNKCAP) */ 247 MSG_ERR_REJ_HWCAP_1, /* MSG_INTL(MSG_ERR_REJ_HWCAP_1) */ 248 MSG_ERR_REJ_SFCAP_1, /* MSG_INTL(MSG_ERR_REJ_SFCAP_1) */ 249 MSG_ERR_REJ_MACHCAP, /* MSG_INTL(MSG_ERR_REJ_MACHCAP) */ 250 MSG_ERR_REJ_PLATCAP, /* MSG_INTL(MSG_ERR_REJ_PLATCAP) */ 251 MSG_ERR_REJ_HWCAP_2 /* MSG_INTL(MSG_ERR_REJ_HWCAP_2) */ 252 }; 253 254 const Msg 255 ldd_warn[] = { 256 MSG_STR_EMPTY, 257 MSG_STR_EMPTY, 258 MSG_STR_EMPTY, 259 MSG_STR_EMPTY, 260 MSG_STR_EMPTY, 261 MSG_STR_EMPTY, 262 MSG_STR_EMPTY, 263 MSG_STR_EMPTY, 264 MSG_STR_EMPTY, 265 MSG_STR_EMPTY, 266 MSG_STR_EMPTY, 267 MSG_STR_EMPTY, 268 MSG_LDD_WARN_UNKCAP, /* MSG_INTL(MSG_LDD_WARN_UNKCAP) */ 269 MSG_LDD_WARN_HWCAP_1, /* MSG_INTL(MSG_LDD_WARN_HWCAP_1) */ 270 MSG_LDD_WARN_SFCAP_1, /* MSG_INTL(MSG_LDD_WARN_SFCAP_1) */ 271 MSG_LDD_WARN_MACHCAP, /* MSG_INTL(MSG_LDD_WARN_MACHCAP) */ 272 MSG_LDD_WARN_PLATCAP, /* MSG_INTL(MSG_LDD_WARN_PLATCAP) */ 273 MSG_LDD_WARN_HWCAP_2 /* MSG_INTL(MSG_LDD_WARN_HWCAP_2) */ 274 }; 275