1 /* libio vtable validation.
2 Copyright (C) 2016-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #include <dlfcn.h>
20 #include <libioP.h>
21 #include <stdio.h>
22 #include <ldsodefs.h>
23 #include <pointer_guard.h>
24 #include <libio-macros.h>
25
26 /* Both _IO_str_* and _IO_new_file functions are pulled into every link (from
27 stdio initialization). */
28 #ifndef SHARED
29 /* NB: the following directives do add pragma weak for _IO_default _* and
30 _IO_wdefault_* symbols to potentially avoid link failures, since they
31 are always used when the __io_vtables is used. */
32 # pragma weak _IO_wstr_finish
33 # pragma weak _IO_wstr_overflow
34 # pragma weak _IO_wstr_pbackfail
35 # pragma weak _IO_wstr_seekoff
36 # pragma weak _IO_wstr_underflow
37
38 # pragma weak _IO_file_close
39 # pragma weak _IO_file_close_mmap
40 # pragma weak _IO_file_doallocate
41 # pragma weak _IO_file_finish
42 # pragma weak _IO_file_overflow
43 # pragma weak _IO_file_read
44 # pragma weak _IO_file_seek
45 # pragma weak _IO_file_seekoff_maybe_mmap
46 # pragma weak _IO_file_seekoff_mmap
47 # pragma weak _IO_file_setbuf
48 # pragma weak _IO_file_setbuf_mmap
49 # pragma weak _IO_file_setbuf_mmap
50 # pragma weak _IO_file_stat
51 # pragma weak _IO_file_sync
52 # pragma weak _IO_file_sync_mmap
53 # pragma weak _IO_file_underflow
54 # pragma weak _IO_file_underflow_maybe_mmap
55 # pragma weak _IO_file_underflow_mmap
56 # pragma weak _IO_file_xsgetn
57 # pragma weak _IO_file_xsgetn_maybe_mmap
58 # pragma weak _IO_file_xsgetn_mmap
59 # pragma weak _IO_file_xsputn
60
61 # pragma weak _IO_wfile_overflow
62 # pragma weak _IO_wfile_sync
63 # pragma weak _IO_wfile_underflow
64 # pragma weak _IO_wfile_underflow_maybe_mmap
65 # pragma weak _IO_wfile_underflow_mmap
66 # pragma weak _IO_wfile_doallocate
67 # pragma weak _IO_wfile_seekoff
68 # pragma weak _IO_wfile_xsputn
69
70 # pragma weak _IO_new_proc_close
71
72 # pragma weak _IO_cookie_close
73 # pragma weak _IO_cookie_read
74 # pragma weak _IO_cookie_seek
75 # pragma weak _IO_cookie_seekoff
76 # pragma weak _IO_cookie_write
77
78 # pragma weak _IO_mem_finish
79 # pragma weak _IO_mem_sync
80
81 # pragma weak _IO_wmem_finish
82 # pragma weak _IO_wmem_sync
83
84 # pragma weak __printf_buffer_as_file_overflow
85 # pragma weak __printf_buffer_as_file_xsputn
86
87 # pragma weak __wprintf_buffer_as_file_overflow
88 # pragma weak __wprintf_buffer_as_file_xsputn
89 #endif
90
91 const struct _IO_jump_t __io_vtables[IO_VTABLES_LEN] attribute_relro =
92 {
93 /* _IO_str_jumps */
94 [IO_STR_JUMPS] =
95 {
96 JUMP_INIT_DUMMY,
97 JUMP_INIT (finish, _IO_str_finish),
98 JUMP_INIT (overflow, _IO_str_overflow),
99 JUMP_INIT (underflow, _IO_str_underflow),
100 JUMP_INIT (uflow, _IO_default_uflow),
101 JUMP_INIT (pbackfail, _IO_str_pbackfail),
102 JUMP_INIT (xsputn, _IO_default_xsputn),
103 JUMP_INIT (xsgetn, _IO_default_xsgetn),
104 JUMP_INIT (seekoff, _IO_str_seekoff),
105 JUMP_INIT (seekpos, _IO_default_seekpos),
106 JUMP_INIT (setbuf, _IO_default_setbuf),
107 JUMP_INIT (sync, _IO_default_sync),
108 JUMP_INIT (doallocate, _IO_default_doallocate),
109 JUMP_INIT (read, _IO_default_read),
110 JUMP_INIT (write, _IO_default_write),
111 JUMP_INIT (seek, _IO_default_seek),
112 JUMP_INIT (close, _IO_default_close),
113 JUMP_INIT (stat, _IO_default_stat),
114 JUMP_INIT (showmanyc, _IO_default_showmanyc),
115 JUMP_INIT (imbue, _IO_default_imbue)
116 },
117 /* _IO_wstr_jumps */
118 [IO_WSTR_JUMPS] = {
119 JUMP_INIT_DUMMY,
120 JUMP_INIT (finish, _IO_wstr_finish),
121 JUMP_INIT (overflow, (_IO_overflow_t) _IO_wstr_overflow),
122 JUMP_INIT (underflow, (_IO_underflow_t) _IO_wstr_underflow),
123 JUMP_INIT (uflow, (_IO_underflow_t) _IO_wdefault_uflow),
124 JUMP_INIT (pbackfail, (_IO_pbackfail_t) _IO_wstr_pbackfail),
125 JUMP_INIT (xsputn, _IO_wdefault_xsputn),
126 JUMP_INIT (xsgetn, _IO_wdefault_xsgetn),
127 JUMP_INIT (seekoff, _IO_wstr_seekoff),
128 JUMP_INIT (seekpos, _IO_default_seekpos),
129 JUMP_INIT (setbuf, _IO_default_setbuf),
130 JUMP_INIT (sync, _IO_default_sync),
131 JUMP_INIT (doallocate, _IO_wdefault_doallocate),
132 JUMP_INIT (read, _IO_default_read),
133 JUMP_INIT (write, _IO_default_write),
134 JUMP_INIT (seek, _IO_default_seek),
135 JUMP_INIT (close, _IO_default_close),
136 JUMP_INIT (stat, _IO_default_stat),
137 JUMP_INIT (showmanyc, _IO_default_showmanyc),
138 JUMP_INIT (imbue, _IO_default_imbue)
139 },
140 /* _IO_file_jumps */
141 [IO_FILE_JUMPS] = {
142 JUMP_INIT_DUMMY,
143 JUMP_INIT (finish, _IO_file_finish),
144 JUMP_INIT (overflow, _IO_file_overflow),
145 JUMP_INIT (underflow, _IO_file_underflow),
146 JUMP_INIT (uflow, _IO_default_uflow),
147 JUMP_INIT (pbackfail, _IO_default_pbackfail),
148 JUMP_INIT (xsputn, _IO_file_xsputn),
149 JUMP_INIT (xsgetn, _IO_file_xsgetn),
150 JUMP_INIT (seekoff, _IO_new_file_seekoff),
151 JUMP_INIT (seekpos, _IO_default_seekpos),
152 JUMP_INIT (setbuf, _IO_new_file_setbuf),
153 JUMP_INIT (sync, _IO_new_file_sync),
154 JUMP_INIT (doallocate, _IO_file_doallocate),
155 JUMP_INIT (read, _IO_file_read),
156 JUMP_INIT (write, _IO_new_file_write),
157 JUMP_INIT (seek, _IO_file_seek),
158 JUMP_INIT (close, _IO_file_close),
159 JUMP_INIT (stat, _IO_file_stat),
160 JUMP_INIT (showmanyc, _IO_default_showmanyc),
161 JUMP_INIT (imbue, _IO_default_imbue)
162 },
163 /* _IO_file_jumps_mmap */
164 [IO_FILE_JUMPS_MMAP] = {
165 JUMP_INIT_DUMMY,
166 JUMP_INIT (finish, _IO_file_finish),
167 JUMP_INIT (overflow, _IO_file_overflow),
168 JUMP_INIT (underflow, _IO_file_underflow_mmap),
169 JUMP_INIT (uflow, _IO_default_uflow),
170 JUMP_INIT (pbackfail, _IO_default_pbackfail),
171 JUMP_INIT (xsputn, _IO_new_file_xsputn),
172 JUMP_INIT (xsgetn, _IO_file_xsgetn_mmap),
173 JUMP_INIT (seekoff, _IO_file_seekoff_mmap),
174 JUMP_INIT (seekpos, _IO_default_seekpos),
175 JUMP_INIT (setbuf, (_IO_setbuf_t) _IO_file_setbuf_mmap),
176 JUMP_INIT (sync, _IO_file_sync_mmap),
177 JUMP_INIT (doallocate, _IO_file_doallocate),
178 JUMP_INIT (read, _IO_file_read),
179 JUMP_INIT (write, _IO_new_file_write),
180 JUMP_INIT (seek, _IO_file_seek),
181 JUMP_INIT (close, _IO_file_close_mmap),
182 JUMP_INIT (stat, _IO_file_stat),
183 JUMP_INIT (showmanyc, _IO_default_showmanyc),
184 JUMP_INIT (imbue, _IO_default_imbue)
185 },
186 /* _IO_file_jumps_maybe_mmap */
187 [IO_FILE_JUMPS_MAYBE_MMAP] = {
188 JUMP_INIT_DUMMY,
189 JUMP_INIT (finish, _IO_file_finish),
190 JUMP_INIT (overflow, _IO_file_overflow),
191 JUMP_INIT (underflow, _IO_file_underflow_maybe_mmap),
192 JUMP_INIT (uflow, _IO_default_uflow),
193 JUMP_INIT (pbackfail, _IO_default_pbackfail),
194 JUMP_INIT (xsputn, _IO_new_file_xsputn),
195 JUMP_INIT (xsgetn, _IO_file_xsgetn_maybe_mmap),
196 JUMP_INIT (seekoff, _IO_file_seekoff_maybe_mmap),
197 JUMP_INIT (seekpos, _IO_default_seekpos),
198 JUMP_INIT (setbuf, (_IO_setbuf_t) _IO_file_setbuf_mmap),
199 JUMP_INIT (sync, _IO_new_file_sync),
200 JUMP_INIT (doallocate, _IO_file_doallocate),
201 JUMP_INIT (read, _IO_file_read),
202 JUMP_INIT (write, _IO_new_file_write),
203 JUMP_INIT (seek, _IO_file_seek),
204 JUMP_INIT (close, _IO_file_close),
205 JUMP_INIT (stat, _IO_file_stat),
206 JUMP_INIT (showmanyc, _IO_default_showmanyc),
207 JUMP_INIT (imbue, _IO_default_imbue)
208 },
209 /* _IO_wfile_jumps */
210 [IO_WFILE_JUMPS] = {
211 JUMP_INIT_DUMMY,
212 JUMP_INIT (finish, _IO_new_file_finish),
213 JUMP_INIT (overflow, (_IO_overflow_t) _IO_wfile_overflow),
214 JUMP_INIT (underflow, (_IO_underflow_t) _IO_wfile_underflow),
215 JUMP_INIT (uflow, (_IO_underflow_t) _IO_wdefault_uflow),
216 JUMP_INIT (pbackfail, (_IO_pbackfail_t) _IO_wdefault_pbackfail),
217 JUMP_INIT (xsputn, _IO_wfile_xsputn),
218 JUMP_INIT (xsgetn, _IO_file_xsgetn),
219 JUMP_INIT (seekoff, _IO_wfile_seekoff),
220 JUMP_INIT (seekpos, _IO_default_seekpos),
221 JUMP_INIT (setbuf, _IO_new_file_setbuf),
222 JUMP_INIT (sync, (_IO_sync_t) _IO_wfile_sync),
223 JUMP_INIT (doallocate, _IO_wfile_doallocate),
224 JUMP_INIT (read, _IO_file_read),
225 JUMP_INIT (write, _IO_new_file_write),
226 JUMP_INIT (seek, _IO_file_seek),
227 JUMP_INIT (close, _IO_file_close),
228 JUMP_INIT (stat, _IO_file_stat),
229 JUMP_INIT (showmanyc, _IO_default_showmanyc),
230 JUMP_INIT (imbue, _IO_default_imbue)
231 },
232 /* _IO_wfile_jumps_mmap */
233 [IO_WFILE_JUMPS_MMAP] = {
234 JUMP_INIT_DUMMY,
235 JUMP_INIT (finish, _IO_new_file_finish),
236 JUMP_INIT (overflow, (_IO_overflow_t) _IO_wfile_overflow),
237 JUMP_INIT (underflow, (_IO_underflow_t) _IO_wfile_underflow_mmap),
238 JUMP_INIT (uflow, (_IO_underflow_t) _IO_wdefault_uflow),
239 JUMP_INIT (pbackfail, (_IO_pbackfail_t) _IO_wdefault_pbackfail),
240 JUMP_INIT (xsputn, _IO_wfile_xsputn),
241 JUMP_INIT (xsgetn, _IO_file_xsgetn),
242 JUMP_INIT (seekoff, _IO_wfile_seekoff),
243 JUMP_INIT (seekpos, _IO_default_seekpos),
244 JUMP_INIT (setbuf, _IO_file_setbuf_mmap),
245 JUMP_INIT (sync, (_IO_sync_t) _IO_wfile_sync),
246 JUMP_INIT (doallocate, _IO_wfile_doallocate),
247 JUMP_INIT (read, _IO_file_read),
248 JUMP_INIT (write, _IO_new_file_write),
249 JUMP_INIT (seek, _IO_file_seek),
250 JUMP_INIT (close, _IO_file_close_mmap),
251 JUMP_INIT (stat, _IO_file_stat),
252 JUMP_INIT (showmanyc, _IO_default_showmanyc),
253 JUMP_INIT (imbue, _IO_default_imbue)
254 },
255 /* _IO_wfile_jumps_maybe_mmap */
256 [IO_WFILE_JUMPS_MAYBE_MMAP] = {
257 JUMP_INIT_DUMMY,
258 JUMP_INIT (finish, _IO_new_file_finish),
259 JUMP_INIT (overflow, (_IO_overflow_t) _IO_wfile_overflow),
260 JUMP_INIT (underflow, (_IO_underflow_t) _IO_wfile_underflow_maybe_mmap),
261 JUMP_INIT (uflow, (_IO_underflow_t) _IO_wdefault_uflow),
262 JUMP_INIT (pbackfail, (_IO_pbackfail_t) _IO_wdefault_pbackfail),
263 JUMP_INIT (xsputn, _IO_wfile_xsputn),
264 JUMP_INIT (xsgetn, _IO_file_xsgetn),
265 JUMP_INIT (seekoff, _IO_wfile_seekoff),
266 JUMP_INIT (seekpos, _IO_default_seekpos),
267 JUMP_INIT (setbuf, _IO_file_setbuf_mmap),
268 JUMP_INIT (sync, (_IO_sync_t) _IO_wfile_sync),
269 JUMP_INIT (doallocate, _IO_wfile_doallocate),
270 JUMP_INIT (read, _IO_file_read),
271 JUMP_INIT (write, _IO_new_file_write),
272 JUMP_INIT (seek, _IO_file_seek),
273 JUMP_INIT (close, _IO_file_close),
274 JUMP_INIT (stat, _IO_file_stat),
275 JUMP_INIT (showmanyc, _IO_default_showmanyc),
276 JUMP_INIT (imbue, _IO_default_imbue)
277 },
278 /* _IO_cookie_jumps */
279 [IO_COOKIE_JUMPS] = {
280 JUMP_INIT_DUMMY,
281 JUMP_INIT (finish, _IO_file_finish),
282 JUMP_INIT (overflow, _IO_file_overflow),
283 JUMP_INIT (underflow, _IO_file_underflow),
284 JUMP_INIT (uflow, _IO_default_uflow),
285 JUMP_INIT (pbackfail, _IO_default_pbackfail),
286 JUMP_INIT (xsputn, _IO_file_xsputn),
287 JUMP_INIT (xsgetn, _IO_default_xsgetn),
288 JUMP_INIT (seekoff, _IO_cookie_seekoff),
289 JUMP_INIT (seekpos, _IO_default_seekpos),
290 JUMP_INIT (setbuf, _IO_file_setbuf),
291 JUMP_INIT (sync, _IO_file_sync),
292 JUMP_INIT (doallocate, _IO_file_doallocate),
293 JUMP_INIT (read, _IO_cookie_read),
294 JUMP_INIT (write, _IO_cookie_write),
295 JUMP_INIT (seek, _IO_cookie_seek),
296 JUMP_INIT (close, _IO_cookie_close),
297 JUMP_INIT (stat, _IO_default_stat),
298 JUMP_INIT (showmanyc, _IO_default_showmanyc),
299 JUMP_INIT (imbue, _IO_default_imbue),
300 },
301 /* _IO_proc_jumps */
302 [IO_PROC_JUMPS] = {
303 JUMP_INIT_DUMMY,
304 JUMP_INIT (finish, _IO_new_file_finish),
305 JUMP_INIT (overflow, _IO_new_file_overflow),
306 JUMP_INIT (underflow, _IO_new_file_underflow),
307 JUMP_INIT (uflow, _IO_default_uflow),
308 JUMP_INIT (pbackfail, _IO_default_pbackfail),
309 JUMP_INIT (xsputn, _IO_new_file_xsputn),
310 JUMP_INIT (xsgetn, _IO_default_xsgetn),
311 JUMP_INIT (seekoff, _IO_new_file_seekoff),
312 JUMP_INIT (seekpos, _IO_default_seekpos),
313 JUMP_INIT (setbuf, _IO_new_file_setbuf),
314 JUMP_INIT (sync, _IO_new_file_sync),
315 JUMP_INIT (doallocate, _IO_file_doallocate),
316 JUMP_INIT (read, _IO_file_read),
317 JUMP_INIT (write, _IO_new_file_write),
318 JUMP_INIT (seek, _IO_file_seek),
319 JUMP_INIT (close, _IO_new_proc_close),
320 JUMP_INIT (stat, _IO_file_stat),
321 JUMP_INIT (showmanyc, _IO_default_showmanyc),
322 JUMP_INIT (imbue, _IO_default_imbue)
323 },
324 /* _IO_mem_jumps */
325 [IO_MEM_JUMPS] = {
326 JUMP_INIT_DUMMY,
327 JUMP_INIT (finish, _IO_mem_finish),
328 JUMP_INIT (overflow, _IO_str_overflow),
329 JUMP_INIT (underflow, _IO_str_underflow),
330 JUMP_INIT (uflow, _IO_default_uflow),
331 JUMP_INIT (pbackfail, _IO_str_pbackfail),
332 JUMP_INIT (xsputn, _IO_default_xsputn),
333 JUMP_INIT (xsgetn, _IO_default_xsgetn),
334 JUMP_INIT (seekoff, _IO_str_seekoff),
335 JUMP_INIT (seekpos, _IO_default_seekpos),
336 JUMP_INIT (setbuf, _IO_default_setbuf),
337 JUMP_INIT (sync, _IO_mem_sync),
338 JUMP_INIT (doallocate, _IO_default_doallocate),
339 JUMP_INIT (read, _IO_default_read),
340 JUMP_INIT (write, _IO_default_write),
341 JUMP_INIT (seek, _IO_default_seek),
342 JUMP_INIT (close, _IO_default_close),
343 JUMP_INIT (stat, _IO_default_stat),
344 JUMP_INIT (showmanyc, _IO_default_showmanyc),
345 JUMP_INIT (imbue, _IO_default_imbue)
346 },
347 /* _IO_wmem_jumps */
348 [IO_WMEM_JUMPS] = {
349 JUMP_INIT_DUMMY,
350 JUMP_INIT (finish, _IO_wmem_finish),
351 JUMP_INIT (overflow, (_IO_overflow_t) _IO_wstr_overflow),
352 JUMP_INIT (underflow, (_IO_underflow_t) _IO_wstr_underflow),
353 JUMP_INIT (uflow, (_IO_underflow_t) _IO_wdefault_uflow),
354 JUMP_INIT (pbackfail, (_IO_pbackfail_t) _IO_wstr_pbackfail),
355 JUMP_INIT (xsputn, _IO_wdefault_xsputn),
356 JUMP_INIT (xsgetn, _IO_wdefault_xsgetn),
357 JUMP_INIT (seekoff, _IO_wstr_seekoff),
358 JUMP_INIT (seekpos, _IO_default_seekpos),
359 JUMP_INIT (setbuf, _IO_default_setbuf),
360 JUMP_INIT (sync, _IO_wmem_sync),
361 JUMP_INIT (doallocate, _IO_wdefault_doallocate),
362 JUMP_INIT (read, _IO_default_read),
363 JUMP_INIT (write, _IO_default_write),
364 JUMP_INIT (seek, _IO_default_seek),
365 JUMP_INIT (close, _IO_default_close),
366 JUMP_INIT (stat, _IO_default_stat),
367 JUMP_INIT (showmanyc, _IO_default_showmanyc),
368 JUMP_INIT (imbue, _IO_default_imbue)
369 },
370 [IO_PRINTF_BUFFER_AS_FILE_JUMPS] = {
371 JUMP_INIT_DUMMY,
372 JUMP_INIT (finish, NULL),
373 JUMP_INIT (overflow, __printf_buffer_as_file_overflow),
374 JUMP_INIT (underflow, NULL),
375 JUMP_INIT (uflow, NULL),
376 JUMP_INIT (pbackfail, NULL),
377 JUMP_INIT (xsputn, __printf_buffer_as_file_xsputn),
378 JUMP_INIT (xsgetn, NULL),
379 JUMP_INIT (seekoff, NULL),
380 JUMP_INIT (seekpos, NULL),
381 JUMP_INIT (setbuf, NULL),
382 JUMP_INIT (sync, NULL),
383 JUMP_INIT (doallocate, NULL),
384 JUMP_INIT (read, NULL),
385 JUMP_INIT (write, NULL),
386 JUMP_INIT (seek, NULL),
387 JUMP_INIT (close, NULL),
388 JUMP_INIT (stat, NULL),
389 JUMP_INIT (showmanyc, NULL),
390 JUMP_INIT (imbue, NULL)
391 },
392 [IO_WPRINTF_BUFFER_AS_FILE_JUMPS] = {
393 JUMP_INIT_DUMMY,
394 JUMP_INIT (finish, NULL),
395 JUMP_INIT (overflow, (_IO_overflow_t) __wprintf_buffer_as_file_overflow),
396 JUMP_INIT (underflow, NULL),
397 JUMP_INIT (uflow, NULL),
398 JUMP_INIT (pbackfail, NULL),
399 JUMP_INIT (xsputn, __wprintf_buffer_as_file_xsputn),
400 JUMP_INIT (xsgetn, NULL),
401 JUMP_INIT (seekoff, NULL),
402 JUMP_INIT (seekpos, NULL),
403 JUMP_INIT (setbuf, NULL),
404 JUMP_INIT (sync, NULL),
405 JUMP_INIT (doallocate, NULL),
406 JUMP_INIT (read, NULL),
407 JUMP_INIT (write, NULL),
408 JUMP_INIT (seek, NULL),
409 JUMP_INIT (close, NULL),
410 JUMP_INIT (stat, NULL),
411 JUMP_INIT (showmanyc, NULL),
412 JUMP_INIT (imbue, NULL)
413 },
414
415 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
416 /* _IO_old_file_jumps */
417 [IO_OLD_FILE_JUMPS] = {
418 JUMP_INIT_DUMMY,
419 JUMP_INIT (finish, _IO_old_file_finish),
420 JUMP_INIT (overflow, _IO_old_file_overflow),
421 JUMP_INIT (underflow, _IO_old_file_underflow),
422 JUMP_INIT (uflow, _IO_default_uflow),
423 JUMP_INIT (pbackfail, _IO_default_pbackfail),
424 JUMP_INIT (xsputn, _IO_old_file_xsputn),
425 JUMP_INIT (xsgetn, _IO_default_xsgetn),
426 JUMP_INIT (seekoff, _IO_old_file_seekoff),
427 JUMP_INIT (seekpos, _IO_default_seekpos),
428 JUMP_INIT (setbuf, _IO_old_file_setbuf),
429 JUMP_INIT (sync, _IO_old_file_sync),
430 JUMP_INIT (doallocate, _IO_file_doallocate),
431 JUMP_INIT (read, _IO_file_read),
432 JUMP_INIT (write, _IO_old_file_write),
433 JUMP_INIT (seek, _IO_file_seek),
434 JUMP_INIT (close, _IO_file_close),
435 JUMP_INIT (stat, _IO_file_stat)
436 },
437 /* _IO_old_proc_jumps */
438 [IO_OLD_PROC_JUMPS] = {
439 JUMP_INIT_DUMMY,
440 JUMP_INIT (finish, _IO_old_file_finish),
441 JUMP_INIT (overflow, _IO_old_file_overflow),
442 JUMP_INIT (underflow, _IO_old_file_underflow),
443 JUMP_INIT (uflow, _IO_default_uflow),
444 JUMP_INIT (pbackfail, _IO_default_pbackfail),
445 JUMP_INIT (xsputn, _IO_old_file_xsputn),
446 JUMP_INIT (xsgetn, _IO_default_xsgetn),
447 JUMP_INIT (seekoff, _IO_old_file_seekoff),
448 JUMP_INIT (seekpos, _IO_default_seekpos),
449 JUMP_INIT (setbuf, _IO_old_file_setbuf),
450 JUMP_INIT (sync, _IO_old_file_sync),
451 JUMP_INIT (doallocate, _IO_file_doallocate),
452 JUMP_INIT (read, _IO_file_read),
453 JUMP_INIT (write, _IO_old_file_write),
454 JUMP_INIT (seek, _IO_file_seek),
455 JUMP_INIT (close, _IO_old_proc_close),
456 JUMP_INIT (stat, _IO_file_stat),
457 JUMP_INIT (showmanyc, _IO_default_showmanyc),
458 JUMP_INIT (imbue, _IO_default_imbue)
459 },
460 #endif
461
462 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
463 /* _IO_old_cookie_jumps */
464 [IO_OLD_COOKIED_JUMPS] = {
465 JUMP_INIT_DUMMY,
466 JUMP_INIT (finish, _IO_file_finish),
467 JUMP_INIT (overflow, _IO_file_overflow),
468 JUMP_INIT (underflow, _IO_file_underflow),
469 JUMP_INIT (uflow, _IO_default_uflow),
470 JUMP_INIT (pbackfail, _IO_default_pbackfail),
471 JUMP_INIT (xsputn, _IO_file_xsputn),
472 JUMP_INIT (xsgetn, _IO_default_xsgetn),
473 JUMP_INIT (seekoff, _IO_cookie_seekoff),
474 JUMP_INIT (seekpos, _IO_default_seekpos),
475 JUMP_INIT (setbuf, _IO_file_setbuf),
476 JUMP_INIT (sync, _IO_file_sync),
477 JUMP_INIT (doallocate, _IO_file_doallocate),
478 JUMP_INIT (read, _IO_cookie_read),
479 JUMP_INIT (write, _IO_cookie_write),
480 JUMP_INIT (seek, _IO_old_cookie_seek),
481 JUMP_INIT (close, _IO_cookie_close),
482 JUMP_INIT (stat, _IO_default_stat),
483 JUMP_INIT (showmanyc, _IO_default_showmanyc),
484 JUMP_INIT (imbue, _IO_default_imbue),
485 },
486 #endif
487 };
488
489 #ifdef SHARED
490
491 void (*IO_accept_foreign_vtables) (void) attribute_hidden;
492
493 #else /* !SHARED */
494
495 /* Used to check whether static dlopen support is needed. */
496 # pragma weak __dlopen
497
498 #endif
499
500 void attribute_hidden
501 _IO_vtable_check (void)
502 {
503 #ifdef SHARED
504 /* Honor the compatibility flag. */
505 void (*flag) (void) = atomic_load_relaxed (&IO_accept_foreign_vtables);
506 PTR_DEMANGLE (flag);
507 if (flag == &_IO_vtable_check)
508 return;
509
510 /* In case this libc copy is in a non-default namespace, we always
511 need to accept foreign vtables because there is always a
512 possibility that FILE * objects are passed across the linking
513 boundary. */
514 {
515 Dl_info di;
516 struct link_map *l;
517 if (!rtld_active ()
518 || (_dl_addr (_IO_vtable_check, &di, &l, NULL) != 0
519 && l->l_ns != LM_ID_BASE))
520 return;
521 }
522
523 #else /* !SHARED */
524 /* We cannot perform vtable validation in the static dlopen case
525 because FILE * handles might be passed back and forth across the
526 boundary. Therefore, we disable checking in this case. */
527 if (__dlopen != NULL)
528 return;
529 #endif
530
531 __libc_fatal ("Fatal error: glibc detected an invalid stdio handle\n");
532 }
533
534 /* Some variants of libstdc++ interpose _IO_2_1_stdin_ etc. and
535 install their own vtables directly, without calling _IO_init or
536 other functions. Detect this by looking at the vtables values
537 during startup, and disable vtable validation in this case. */
538 #ifdef SHARED
539 __attribute__ ((constructor))
540 static void
541 check_stdfiles_vtables (void)
542 {
543 if (_IO_2_1_stdin_.vtable != &_IO_file_jumps
544 || _IO_2_1_stdout_.vtable != &_IO_file_jumps
545 || _IO_2_1_stderr_.vtable != &_IO_file_jumps)
546 IO_set_accept_foreign_vtables (&_IO_vtable_check);
547 }
548 #endif
549
550 #define STR(s) XSTR(s)
551 #define XSTR(s) #s
552
553 #undef _IO_file_jumps
554 #define _IO_file_jumps_alias "__io_vtables + " STR(IO_FILE_JUMPS_OFFSET)
555 declare_object_symbol_alias (_IO_file_jumps, _IO_file_jumps_alias,
556 IO_JUMP_T_SIZE)
557 #undef _IO_wfile_jumps
558 #define _IO_wfile_jumps_alias "__io_vtables + " STR(IO_WFILE_JUMPS_OFFSET)
559 declare_object_symbol_alias (_IO_wfile_jumps, _IO_wfile_jumps_alias,
560 IO_JUMP_T_SIZE)