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source: vbox/trunk/src/libs/openssl-1.1.1g/crypto/dso/dso_dlfcn.c@ 85622

Last change on this file since 85622 was 83916, checked in by vboxsync, 5 years ago

openssl-1.1.1g: Applied and adjusted our OpenSSL changes to 1.1.1g. bugref:9719
File size: 13.4 KB
Line 
1/*
2 * Copyright 2000-2019 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10/*
11 * We need to do this early, because stdio.h includes the header files that
12 * handle _GNU_SOURCE and other similar macros. Defining it later is simply
13 * too late, because those headers are protected from re- inclusion.
14 */
15#ifndef _GNU_SOURCE
16# define _GNU_SOURCE /* make sure dladdr is declared */
17#endif
18
19#include "dso_local.h"
20#include "e_os.h"
21
22#ifdef DSO_DLFCN
23
24# ifdef HAVE_DLFCN_H
25# ifdef __osf__
26# define __EXTENSIONS__
27# endif
28# include <dlfcn.h>
29# define HAVE_DLINFO 1
30# if defined(__SCO_VERSION__) || defined(_SCO_ELF) || \
31 (defined(__osf__) && !defined(RTLD_NEXT)) || \
32 (defined(__OpenBSD__) && !defined(RTLD_SELF)) || \
33 defined(__ANDROID__)
34# undef HAVE_DLINFO
35# endif
36# endif
37
38/* Part of the hack in "dlfcn_load" ... */
39# define DSO_MAX_TRANSLATED_SIZE 256
40
41static int dlfcn_load(DSO *dso);
42static int dlfcn_unload(DSO *dso);
43static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname);
44static char *dlfcn_name_converter(DSO *dso, const char *filename);
45static char *dlfcn_merger(DSO *dso, const char *filespec1,
46 const char *filespec2);
47static int dlfcn_pathbyaddr(void *addr, char *path, int sz);
48static void *dlfcn_globallookup(const char *name);
49
50static DSO_METHOD dso_meth_dlfcn = {
51 "OpenSSL 'dlfcn' shared library method",
52 dlfcn_load,
53 dlfcn_unload,
54 dlfcn_bind_func,
55 NULL, /* ctrl */
56 dlfcn_name_converter,
57 dlfcn_merger,
58 NULL, /* init */
59 NULL, /* finish */
60 dlfcn_pathbyaddr,
61 dlfcn_globallookup
62};
63
64DSO_METHOD *DSO_METHOD_openssl(void)
65{
66 return &dso_meth_dlfcn;
67}
68
69/*
70 * Prior to using the dlopen() function, we should decide on the flag we
71 * send. There's a few different ways of doing this and it's a messy
72 * venn-diagram to match up which platforms support what. So as we don't have
73 * autoconf yet, I'm implementing a hack that could be hacked further
74 * relatively easily to deal with cases as we find them. Initially this is to
75 * cope with OpenBSD.
76 */
77# if defined(__OpenBSD__) || defined(__NetBSD__)
78# ifdef DL_LAZY
79# define DLOPEN_FLAG DL_LAZY
80# else
81# ifdef RTLD_NOW
82# define DLOPEN_FLAG RTLD_NOW
83# else
84# define DLOPEN_FLAG 0
85# endif
86# endif
87# else
88# define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */
89# endif
90
91/*
92 * For this DSO_METHOD, our meth_data STACK will contain; (i) the handle
93 * (void*) returned from dlopen().
94 */
95
96static int dlfcn_load(DSO *dso)
97{
98 void *ptr = NULL;
99 /* See applicable comments in dso_dl.c */
100 char *filename = DSO_convert_filename(dso, NULL);
101 int flags = DLOPEN_FLAG;
102 int saveerrno = get_last_sys_error();
103
104 if (filename == NULL) {
105 DSOerr(DSO_F_DLFCN_LOAD, DSO_R_NO_FILENAME);
106 goto err;
107 }
108# ifdef RTLD_GLOBAL
109 if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS)
110 flags |= RTLD_GLOBAL;
111# endif
112# ifdef _AIX
113 if (filename[strlen(filename) - 1] == ')')
114 flags |= RTLD_MEMBER;
115# endif
116 ptr = dlopen(filename, flags);
117 if (ptr == NULL) {
118 DSOerr(DSO_F_DLFCN_LOAD, DSO_R_LOAD_FAILED);
119 ERR_add_error_data(4, "filename(", filename, "): ", dlerror());
120 goto err;
121 }
122 /*
123 * Some dlopen() implementations (e.g. solaris) do no preserve errno, even
124 * on a successful call.
125 */
126 set_sys_error(saveerrno);
127 if (!sk_void_push(dso->meth_data, (char *)ptr)) {
128 DSOerr(DSO_F_DLFCN_LOAD, DSO_R_STACK_ERROR);
129 goto err;
130 }
131 /* Success */
132 dso->loaded_filename = filename;
133 return 1;
134 err:
135 /* Cleanup! */
136 OPENSSL_free(filename);
137 if (ptr != NULL)
138 dlclose(ptr);
139 return 0;
140}
141
142static int dlfcn_unload(DSO *dso)
143{
144 void *ptr;
145 if (dso == NULL) {
146 DSOerr(DSO_F_DLFCN_UNLOAD, ERR_R_PASSED_NULL_PARAMETER);
147 return 0;
148 }
149 if (sk_void_num(dso->meth_data) < 1)
150 return 1;
151 ptr = sk_void_pop(dso->meth_data);
152 if (ptr == NULL) {
153 DSOerr(DSO_F_DLFCN_UNLOAD, DSO_R_NULL_HANDLE);
154 /*
155 * Should push the value back onto the stack in case of a retry.
156 */
157 sk_void_push(dso->meth_data, ptr);
158 return 0;
159 }
160 /* For now I'm not aware of any errors associated with dlclose() */
161 dlclose(ptr);
162 return 1;
163}
164
165static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname)
166{
167 void *ptr;
168 union {
169 DSO_FUNC_TYPE sym;
170 void *dlret;
171 } u;
172
173 if ((dso == NULL) || (symname == NULL)) {
174 DSOerr(DSO_F_DLFCN_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER);
175 return NULL;
176 }
177 if (sk_void_num(dso->meth_data) < 1) {
178 DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_STACK_ERROR);
179 return NULL;
180 }
181 ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
182 if (ptr == NULL) {
183 DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_NULL_HANDLE);
184 return NULL;
185 }
186 u.dlret = dlsym(ptr, symname);
187 if (u.dlret == NULL) {
188 DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_SYM_FAILURE);
189 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
190 return NULL;
191 }
192 return u.sym;
193}
194
195static char *dlfcn_merger(DSO *dso, const char *filespec1,
196 const char *filespec2)
197{
198 char *merged;
199
200 if (!filespec1 && !filespec2) {
201 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_PASSED_NULL_PARAMETER);
202 return NULL;
203 }
204 /*
205 * If the first file specification is a rooted path, it rules. same goes
206 * if the second file specification is missing.
207 */
208 if (!filespec2 || (filespec1 != NULL && filespec1[0] == '/')) {
209 merged = OPENSSL_strdup(filespec1);
210 if (merged == NULL) {
211 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
212 return NULL;
213 }
214 }
215 /*
216 * If the first file specification is missing, the second one rules.
217 */
218 else if (!filespec1) {
219 merged = OPENSSL_strdup(filespec2);
220 if (merged == NULL) {
221 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
222 return NULL;
223 }
224 } else {
225 /*
226 * This part isn't as trivial as it looks. It assumes that the
227 * second file specification really is a directory, and makes no
228 * checks whatsoever. Therefore, the result becomes the
229 * concatenation of filespec2 followed by a slash followed by
230 * filespec1.
231 */
232 int spec2len, len;
233
234 spec2len = strlen(filespec2);
235 len = spec2len + strlen(filespec1);
236
237 if (spec2len && filespec2[spec2len - 1] == '/') {
238 spec2len--;
239 len--;
240 }
241 merged = OPENSSL_malloc(len + 2);
242 if (merged == NULL) {
243 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
244 return NULL;
245 }
246 strcpy(merged, filespec2);
247 merged[spec2len] = '/';
248 strcpy(&merged[spec2len + 1], filespec1);
249 }
250 return merged;
251}
252
253static char *dlfcn_name_converter(DSO *dso, const char *filename)
254{
255 char *translated;
256 int len, rsize, transform;
257
258 len = strlen(filename);
259 rsize = len + 1;
260 transform = (strstr(filename, "/") == NULL);
261 if (transform) {
262 /* We will convert this to "%s.so" or "lib%s.so" etc */
263 rsize += strlen(DSO_EXTENSION); /* The length of ".so" */
264 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
265 rsize += 3; /* The length of "lib" */
266 }
267 translated = OPENSSL_malloc(rsize);
268 if (translated == NULL) {
269 DSOerr(DSO_F_DLFCN_NAME_CONVERTER, DSO_R_NAME_TRANSLATION_FAILED);
270 return NULL;
271 }
272 if (transform) {
273 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
274 sprintf(translated, "lib%s" DSO_EXTENSION, filename);
275 else
276 sprintf(translated, "%s" DSO_EXTENSION, filename);
277 } else
278 sprintf(translated, "%s", filename);
279 return translated;
280}
281
282# ifdef __sgi
283/*-
284This is a quote from IRIX manual for dladdr(3c):
285
286 <dlfcn.h> does not contain a prototype for dladdr or definition of
287 Dl_info. The #include <dlfcn.h> in the SYNOPSIS line is traditional,
288 but contains no dladdr prototype and no IRIX library contains an
289 implementation. Write your own declaration based on the code below.
290
291 The following code is dependent on internal interfaces that are not
292 part of the IRIX compatibility guarantee; however, there is no future
293 intention to change this interface, so on a practical level, the code
294 below is safe to use on IRIX.
295*/
296# include <rld_interface.h>
297# ifndef _RLD_INTERFACE_DLFCN_H_DLADDR
298# define _RLD_INTERFACE_DLFCN_H_DLADDR
299typedef struct Dl_info {
300 const char *dli_fname;
301 void *dli_fbase;
302 const char *dli_sname;
303 void *dli_saddr;
304 int dli_version;
305 int dli_reserved1;
306 long dli_reserved[4];
307} Dl_info;
308# else
309typedef struct Dl_info Dl_info;
310# endif
311# define _RLD_DLADDR 14
312
313static int dladdr(void *address, Dl_info *dl)
314{
315 void *v;
316 v = _rld_new_interface(_RLD_DLADDR, address, dl);
317 return (int)v;
318}
319# endif /* __sgi */
320
321# ifdef _AIX
322/*-
323 * See IBM's AIX Version 7.2, Technical Reference:
324 * Base Operating System and Extensions, Volume 1 and 2
325 * https://www.ibm.com/support/knowledgecenter/ssw_aix_72/com.ibm.aix.base/technicalreferences.htm
326 */
327# include <sys/ldr.h>
328# include <errno.h>
329/* ~ 64 * (sizeof(struct ld_info) + _XOPEN_PATH_MAX + _XOPEN_NAME_MAX) */
330# define DLFCN_LDINFO_SIZE 86976
331typedef struct Dl_info {
332 const char *dli_fname;
333} Dl_info;
334/*
335 * This dladdr()-implementation will also find the ptrgl (Pointer Glue) virtual
336 * address of a function, which is just located in the DATA segment instead of
337 * the TEXT segment.
338 */
339static int dladdr(void *ptr, Dl_info *dl)
340{
341 uintptr_t addr = (uintptr_t)ptr;
342 unsigned int found = 0;
343 struct ld_info *ldinfos, *next_ldi, *this_ldi;
344
345 if ((ldinfos = OPENSSL_malloc(DLFCN_LDINFO_SIZE)) == NULL) {
346 errno = ENOMEM;
347 dl->dli_fname = NULL;
348 return 0;
349 }
350
351 if ((loadquery(L_GETINFO, (void *)ldinfos, DLFCN_LDINFO_SIZE)) < 0) {
352 /*-
353 * Error handling is done through errno and dlerror() reading errno:
354 * ENOMEM (ldinfos buffer is too small),
355 * EINVAL (invalid flags),
356 * EFAULT (invalid ldinfos ptr)
357 */
358 OPENSSL_free((void *)ldinfos);
359 dl->dli_fname = NULL;
360 return 0;
361 }
362 next_ldi = ldinfos;
363
364 do {
365 this_ldi = next_ldi;
366 if (((addr >= (uintptr_t)this_ldi->ldinfo_textorg)
367 && (addr < ((uintptr_t)this_ldi->ldinfo_textorg +
368 this_ldi->ldinfo_textsize)))
369 || ((addr >= (uintptr_t)this_ldi->ldinfo_dataorg)
370 && (addr < ((uintptr_t)this_ldi->ldinfo_dataorg +
371 this_ldi->ldinfo_datasize)))) {
372 char *buffer, *member;
373 size_t buffer_sz, member_len;
374
375 buffer_sz = strlen(this_ldi->ldinfo_filename) + 1;
376 member = this_ldi->ldinfo_filename + buffer_sz;
377 if ((member_len = strlen(member)) > 0)
378 buffer_sz += 1 + member_len + 1;
379 found = 1;
380 if ((buffer = OPENSSL_malloc(buffer_sz)) != NULL) {
381 OPENSSL_strlcpy(buffer, this_ldi->ldinfo_filename, buffer_sz);
382 if (member_len > 0) {
383 /*
384 * Need to respect a possible member name and not just
385 * returning the path name in this case. See docs:
386 * sys/ldr.h, loadquery() and dlopen()/RTLD_MEMBER.
387 */
388 OPENSSL_strlcat(buffer, "(", buffer_sz);
389 OPENSSL_strlcat(buffer, member, buffer_sz);
390 OPENSSL_strlcat(buffer, ")", buffer_sz);
391 }
392 dl->dli_fname = buffer;
393 } else {
394 errno = ENOMEM;
395 }
396 } else {
397 next_ldi = (struct ld_info *)((uintptr_t)this_ldi +
398 this_ldi->ldinfo_next);
399 }
400 } while (this_ldi->ldinfo_next && !found);
401 OPENSSL_free((void *)ldinfos);
402 return (found && dl->dli_fname != NULL);
403}
404# endif /* _AIX */
405
406static int dlfcn_pathbyaddr(void *addr, char *path, int sz)
407{
408# ifdef HAVE_DLINFO
409 Dl_info dli;
410 int len;
411
412 if (addr == NULL) {
413 union {
414 int (*f) (void *, char *, int);
415 void *p;
416 } t = {
417 dlfcn_pathbyaddr
418 };
419 addr = t.p;
420 }
421
422 if (dladdr(addr, &dli)) {
423 len = (int)strlen(dli.dli_fname);
424 if (sz <= 0) {
425# ifdef _AIX
426 OPENSSL_free((void *)dli.dli_fname);
427# endif
428 return len + 1;
429 }
430 if (len >= sz)
431 len = sz - 1;
432 memcpy(path, dli.dli_fname, len);
433 path[len++] = 0;
434# ifdef _AIX
435 OPENSSL_free((void *)dli.dli_fname);
436# endif
437 return len;
438 }
439
440 ERR_add_error_data(2, "dlfcn_pathbyaddr(): ", dlerror());
441# endif
442 return -1;
443}
444
445static void *dlfcn_globallookup(const char *name)
446{
447 void *ret = NULL, *handle = dlopen(NULL, RTLD_LAZY);
448
449 if (handle) {
450 ret = dlsym(handle, name);
451 dlclose(handle);
452 }
453
454 return ret;
455}
456#endif /* DSO_DLFCN */
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