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 (c) 1990, 2010, Oracle and/or its affiliates. All rights reserved.
27 */
28
29 #include <sys/types.h>
30 #include <sys/mman.h>
31 #include <signal.h>
32 #include <dlfcn.h>
33 #include <synch.h>
34 #include <debug.h>
35 #include "_rtld.h"
36
37 /*
38 * Declarations of global variables used in ld.so.
39 */
40 Rt_lock rtldlock;
41 int thr_flg_nolock = 0;
42 int thr_flg_reenter = 0;
43
44 /*
45 * Major link-map lists.
46 */
47 Lm_list lml_main = { 0 }; /* the `main's link map list */
48 Lm_list lml_rtld = { 0 }; /* rtld's link map list */
49
50 /*
51 * Entrance count. Each time ld.so.1 is entered following initial process
52 * setup, this count is bumped. This value serves to identify the present
53 * ld.so.1 operation.
54 *
55 * An ld.so.1 operation can result in many symbol lookup requests (i.e., loading
56 * objects and relocating all symbolic bindings). This count is used to protect
57 * against attempting to re-load a failed lazy load within a single call to
58 * ld.so.1, while allowing such attempts across calls. Should a lazy load fail,
59 * the present operation identifier is saved in the current symbol lookup data
60 * block (Slookup). Should a lazy load fall back operation be triggered, the
61 * identifier in the symbol lookup block is compared to the current ld.so.1
62 * entry count, and if the two are equal the fall back is skipped.
63 *
64 * With this count, there is a danger of wrap-around, although as an unsigned
65 * 32-bit value, it is highly unlikely that any application could usefully make
66 * 4.3 giga-calls into ld.so.1. The worst that can occur is that a fall back
67 * lazy load isn't triggered. However, most lazy loads that fail typically
68 * continue to fail unless the user takes corrective action (adds the necessary
69 * (fixed) dependencies to the system).
70 */
71 ulong_t ld_entry_cnt = 1;
72
73 /*
74 * BEGIN: Exposed to rtld_db, don't change without a coordinated handshake with
75 * librtld_db (remembering that librtld_db must be able to read old as well as
76 * current core files).
77 */
78 APlist *dynlm_list = NULL; /* dynamic list of link-maps */
79 /*
80 * END: Exposed to rtld_db
81 */
82
83 Reglist *reglist = NULL; /* list of register symbols */
84
85 /*
86 * Set of integers to track how many of what type of PLT's have been bound.
87 * This is only really interesting for SPARC since ia32 has only one PLT.
88 */
89 uint32_t pltcnt21d = 0;
90 uint32_t pltcnt24d = 0;
91 uint32_t pltcntu32 = 0;
92 uint32_t pltcntu44 = 0;
93 uint32_t pltcntfull = 0;
94 uint32_t pltcntfar = 0;
95
96 /*
97 * AVL tree pointers.
98 */
99 avl_tree_t *capavl = NULL; /* capabilities files */
100 avl_tree_t *nfavl = NULL; /* not-found path names */
101 avl_tree_t *spavl = NULL; /* secure path names */
102
103 /*
104 * Various other global data.
105 */
106 uint_t rtld_flags = 0;
107 uint_t rtld_flags2 = 0;
108
109 Lc_desc glcs[CI_MAX]; /* global external interfaces */
110
111 const char *procname = NULL;
112 const char *rtldname = MSG_ORIG(MSG_FIL_RTLD);
113
114 char *lasterr = NULL; /* string describing last error */
115 /* cleared by each dlerror() */
116 Interp *interp = NULL; /* ELF interpreter info */
117 APlist *hdl_alp[HDLIST_SZ+2]; /* dlopen() handle list */
118 size_t syspagsz = 0; /* system page size */
119 ulong_t at_flags = 0; /* machine specific file flags */
120 Uts_desc *uts = NULL; /* utsname descriptor */
121 Isa_desc *isa = NULL; /* isalist descriptor */
122
123 uint_t audit_argcnt = 64; /* no. of stack args to copy (default */
124 /* is all) */
125 Audit_desc *auditors = NULL; /* global auditors (LD_AUDIT) */
126 APlist *aud_preinit = NULL; /* list of objects defining local */
127 APlist *aud_activity = NULL; /* preinit and activity auditors */
128
129 const char *rpl_audit = NULL; /* replaceable LD_AUDIT string */
130 const char *rpl_debug = NULL; /* replaceable LD_DEBUG string */
131 const char *rpl_ldflags = NULL; /* replaceable LD_FLAGS string */
132 const char *rpl_libpath = NULL; /* replaceable LD_LIBRARY_PATH string */
133 Alist *rpl_libdirs = NULL; /* and associated Pdesc list */
134 const char *rpl_preload = NULL; /* replaceable LD_PRELOAD string */
135
136 const char *prm_audit = NULL; /* permanent LD_AUDIT string */
137 const char *prm_debug = NULL; /* permanent LD_DEBUG string */
138 const char *prm_ldflags = NULL; /* permanent LD_FLAGS string */
139 const char *prm_libpath = NULL; /* permanent LD_LIBRARY_PATH string */
140 Alist *prm_libdirs = NULL; /* and associated Pdesc list */
141 const char *prm_preload = NULL; /* permanent LD_PRELOAD string */
142
143 uint_t env_info = 0; /* information regarding environment */
144 /* variables */
145 int killsig = SIGKILL; /* signal sent on fatal exit */
146 APlist *free_alp = NULL; /* defragmentation list */
147
148 /*
149 * Capabilities are provided by the system. However, users can define an
150 * alternative set of system capabilities, where they can add, subtract, or
151 * override the system capabilities for testing purposes. Furthermore, these
152 * alternative capabilities can be specified such that they only apply to
153 * specified files rather than to all objects.
154 *
155 * The org_scapset is relied upon by the amd64 version of elf_rtbndr to
156 * determine whether or not AVX registers are present in the system.
157 */
158 static Syscapset scapset = { 0 };
159 Syscapset *org_scapset = &scapset; /* original system and */
160 Syscapset *alt_scapset = &scapset; /* alternative system */
161 /* capabilities */
162
163 const char *rpl_hwcap = NULL; /* replaceable hwcap str */
164 const char *rpl_sfcap = NULL; /* replaceable sfcap str */
165 const char *rpl_machcap = NULL; /* replaceable machcap str */
166 const char *rpl_platcap = NULL; /* replaceable platcap str */
167 const char *rpl_cap_files = NULL; /* associated files */
168
169 const char *prm_hwcap = NULL; /* permanent hwcap str */
170 const char *prm_sfcap = NULL; /* permanent sfcap str */
171 const char *prm_machcap = NULL; /* permanent machcap str */
172 const char *prm_platcap = NULL; /* permanent platcap str */
173 const char *prm_cap_files = NULL; /* associated files */
174
175 /*
176 * Note, the debugging descriptor interposes on the default definition provided
177 * by liblddbg. This is required as ld.so.1 must only have outstanding relative
178 * relocations.
179 */
180 static Dbg_desc _dbg_desc = {0, 0, 0};
181 Dbg_desc *dbg_desc = &_dbg_desc; /* debugging descriptor */
182 const char *dbg_file = NULL; /* debugging directed to file */
183
184 #pragma weak environ = _environ /* environ for PLT tracing - we */
185 char **_environ = NULL; /* supply the pair to satisfy any */
186 /* libc requirements (hwmuldiv) */
187
188 const char *profile_name = NULL; /* object being profiled */
189 const char *profile_out = NULL; /* profile output file */
190 const char *profile_lib = NULL; /* audit library to perform profile */
191
192 uchar_t search_rules[] = { /* dependency search rules */
193 RPLENV, /* replaceable LD_LIBRARY_PATH */
194 PRMENV, /* permanent LD_LIBRARY_PATH */
195 RUNPATH, /* callers runpath */
196 DEFAULT, /* default library path */
197 0
198 };
199
200 Dl_argsinfo argsinfo = { 0 }; /* process argument, environment and */
201 /* auxv information. */
202
203 /*
204 * Frequently used messages are cached here to reduce _dgettext() overhead and
205 * also provide for resetting should the locale change (see _ld_libc()).
206 */
207 const char *err_strs[ERR_NUM] = { NULL };
208 const char *nosym_str = NULL;
209
210
211 /*
212 * Rejection error message tables.
213 */
214 const Msg
215 ldd_reject[SGS_REJ_NUM] = {
216 MSG_STR_EMPTY,
217 MSG_LDD_REJ_MACH, /* MSG_INTL(MSG_LDD_REJ_MACH) */
218 MSG_LDD_REJ_CLASS, /* MSG_INTL(MSG_LDD_REJ_CLASS) */
219 MSG_LDD_REJ_DATA, /* MSG_INTL(MSG_LDD_REJ_DATA) */
220 MSG_LDD_REJ_TYPE, /* MSG_INTL(MSG_LDD_REJ_TYPE) */
221 MSG_LDD_REJ_BADFLAG, /* MSG_INTL(MSG_LDD_REJ_BADFLAG) */
222 MSG_LDD_REJ_MISFLAG, /* MSG_INTL(MSG_LDD_REJ_MISFLAG) */
223 MSG_LDD_REJ_VERSION, /* MSG_INTL(MSG_LDD_REJ_VERSION) */
224 MSG_LDD_REJ_HAL, /* MSG_INTL(MSG_LDD_REJ_HAL) */
225 MSG_LDD_REJ_US3, /* MSG_INTL(MSG_LDD_REJ_US3) */
226 MSG_LDD_REJ_STR, /* MSG_INTL(MSG_LDD_REJ_STR) */
227 MSG_LDD_REJ_UNKFILE, /* MSG_INTL(MSG_LDD_REJ_UNKFILE) */
228 MSG_LDD_REJ_UNKCAP, /* MSG_INTL(MSG_LDD_REJ_UNKCAP) */
229 MSG_LDD_REJ_HWCAP_1, /* MSG_INTL(MSG_LDD_REJ_HWCAP_1) */
230 MSG_LDD_REJ_SFCAP_1, /* MSG_INTL(MSG_LDD_REJ_SFCAP_1) */
231 MSG_LDD_REJ_MACHCAP, /* MSG_INTL(MSG_LDD_REJ_MACHCAP) */
232 MSG_LDD_REJ_PLATCAP, /* MSG_INTL(MSG_LDD_REJ_PLATCAP) */
233 MSG_LDD_REJ_HWCAP_2, /* MSG_INTL(MSG_LDD_REJ_HWCAP_2) */
234 MSG_LDD_REJ_ARCHIVE /* MSG_INTL(MSG_LDD_REJ_ARCHIVE) */
235 };
236 #if SGS_REJ_NUM != (SGS_REJ_ARCHIVE + 1)
237 #error SGS_REJ_NUM has changed
238 #endif
239
240 const Msg
241 err_reject[SGS_REJ_NUM] = {
242 MSG_STR_EMPTY,
243 MSG_ERR_REJ_MACH, /* MSG_INTL(MSG_ERR_REJ_MACH) */
244 MSG_ERR_REJ_CLASS, /* MSG_INTL(MSG_ERR_REJ_CLASS) */
245 MSG_ERR_REJ_DATA, /* MSG_INTL(MSG_ERR_REJ_DATA) */
246 MSG_ERR_REJ_TYPE, /* MSG_INTL(MSG_ERR_REJ_TYPE) */
247 MSG_ERR_REJ_BADFLAG, /* MSG_INTL(MSG_ERR_REJ_BADFLAG) */
248 MSG_ERR_REJ_MISFLAG, /* MSG_INTL(MSG_ERR_REJ_MISFLAG) */
249 MSG_ERR_REJ_VERSION, /* MSG_INTL(MSG_ERR_REJ_VERSION) */
250 MSG_ERR_REJ_HAL, /* MSG_INTL(MSG_ERR_REJ_HAL) */
251 MSG_ERR_REJ_US3, /* MSG_INTL(MSG_ERR_REJ_US3) */
252 MSG_ERR_REJ_STR, /* MSG_INTL(MSG_ERR_REJ_STR) */
253 MSG_ERR_REJ_UNKFILE, /* MSG_INTL(MSG_ERR_REJ_UNKFILE) */
254 MSG_ERR_REJ_UNKCAP, /* MSG_INTL(MSG_ERR_REJ_UNKCAP) */
255 MSG_ERR_REJ_HWCAP_1, /* MSG_INTL(MSG_ERR_REJ_HWCAP_1) */
256 MSG_ERR_REJ_SFCAP_1, /* MSG_INTL(MSG_ERR_REJ_SFCAP_1) */
257 MSG_ERR_REJ_MACHCAP, /* MSG_INTL(MSG_ERR_REJ_MACHCAP) */
258 MSG_ERR_REJ_PLATCAP, /* MSG_INTL(MSG_ERR_REJ_PLATCAP) */
259 MSG_ERR_REJ_HWCAP_2, /* MSG_INTL(MSG_ERR_REJ_HWCAP_2) */
260 MSG_ERR_REJ_ARCHIVE, /* MSG_INTL(MSG_ERR_REJ_ARCHIVE) */
261 };
262 #if SGS_REJ_NUM != (SGS_REJ_ARCHIVE + 1)
263 #error SGS_REJ_NUM has changed
264 #endif
265
266 const Msg
267 ldd_warn[SGS_REJ_NUM] = {
268 MSG_STR_EMPTY,
269 MSG_STR_EMPTY,
270 MSG_STR_EMPTY,
271 MSG_STR_EMPTY,
272 MSG_STR_EMPTY,
273 MSG_STR_EMPTY,
274 MSG_STR_EMPTY,
275 MSG_STR_EMPTY,
276 MSG_STR_EMPTY,
277 MSG_STR_EMPTY,
278 MSG_STR_EMPTY,
279 MSG_STR_EMPTY,
280 MSG_LDD_WARN_UNKCAP, /* MSG_INTL(MSG_LDD_WARN_UNKCAP) */
281 MSG_LDD_WARN_HWCAP_1, /* MSG_INTL(MSG_LDD_WARN_HWCAP_1) */
282 MSG_LDD_WARN_SFCAP_1, /* MSG_INTL(MSG_LDD_WARN_SFCAP_1) */
283 MSG_LDD_WARN_MACHCAP, /* MSG_INTL(MSG_LDD_WARN_MACHCAP) */
284 MSG_LDD_WARN_PLATCAP, /* MSG_INTL(MSG_LDD_WARN_PLATCAP) */
285 MSG_LDD_WARN_HWCAP_2, /* MSG_INTL(MSG_LDD_WARN_HWCAP_2) */
286 MSG_STR_EMPTY
287 };
288 #if SGS_REJ_NUM != (SGS_REJ_ARCHIVE + 1)
289 #error SGS_REJ_NUM has changed
290 #endif