Line data Source code
1 : /* Discard section not used at runtime from object files.
2 : Copyright (C) 2000-2012, 2014, 2015, 2016 Red Hat, Inc.
3 : This file is part of elfutils.
4 : Written by Ulrich Drepper <drepper@redhat.com>, 2000.
5 :
6 : This file is free software; you can redistribute it and/or modify
7 : it under the terms of the GNU General Public License as published by
8 : the Free Software Foundation; either version 3 of the License, or
9 : (at your option) any later version.
10 :
11 : elfutils is distributed in the hope that it will be useful, but
12 : WITHOUT ANY WARRANTY; without even the implied warranty of
13 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 : GNU General Public License for more details.
15 :
16 : You should have received a copy of the GNU General Public License
17 : along with this program. If not, see <http://www.gnu.org/licenses/>. */
18 :
19 : #ifdef HAVE_CONFIG_H
20 : # include <config.h>
21 : #endif
22 :
23 : #include <argp.h>
24 : #include <assert.h>
25 : #include <byteswap.h>
26 : #include <endian.h>
27 : #include <error.h>
28 : #include <fcntl.h>
29 : #include <gelf.h>
30 : #include <libelf.h>
31 : #include <libintl.h>
32 : #include <locale.h>
33 : #include <stdbool.h>
34 : #include <stdio.h>
35 : #include <stdio_ext.h>
36 : #include <stdlib.h>
37 : #include <string.h>
38 : #include <unistd.h>
39 : #include <sys/stat.h>
40 : #include <sys/time.h>
41 :
42 : #include <elf-knowledge.h>
43 : #include <libebl.h>
44 : #include "libdwelf.h"
45 : #include <libeu.h>
46 : #include <system.h>
47 :
48 : typedef uint8_t GElf_Byte;
49 :
50 : /* Name and version of program. */
51 : ARGP_PROGRAM_VERSION_HOOK_DEF = print_version;
52 :
53 : /* Bug report address. */
54 : ARGP_PROGRAM_BUG_ADDRESS_DEF = PACKAGE_BUGREPORT;
55 :
56 :
57 : /* Values for the parameters which have no short form. */
58 : #define OPT_REMOVE_COMMENT 0x100
59 : #define OPT_PERMISSIVE 0x101
60 : #define OPT_STRIP_SECTIONS 0x102
61 : #define OPT_RELOC_DEBUG 0x103
62 :
63 :
64 : /* Definitions of arguments for argp functions. */
65 : static const struct argp_option options[] =
66 : {
67 : { NULL, 0, NULL, 0, N_("Output selection:"), 0 },
68 : { "output", 'o', "FILE", 0, N_("Place stripped output into FILE"), 0 },
69 : { NULL, 'f', "FILE", 0, N_("Extract the removed sections into FILE"), 0 },
70 : { NULL, 'F', "FILE", 0, N_("Embed name FILE instead of -f argument"), 0 },
71 :
72 : { NULL, 0, NULL, 0, N_("Output options:"), 0 },
73 : { "strip-all", 's', NULL, OPTION_HIDDEN, NULL, 0 },
74 : { "strip-debug", 'g', NULL, 0, N_("Remove all debugging symbols"), 0 },
75 : { NULL, 'd', NULL, OPTION_ALIAS, NULL, 0 },
76 : { NULL, 'S', NULL, OPTION_ALIAS, NULL, 0 },
77 : { "strip-sections", OPT_STRIP_SECTIONS, NULL, 0,
78 : N_("Remove section headers (not recommended)"), 0 },
79 : { "preserve-dates", 'p', NULL, 0,
80 : N_("Copy modified/access timestamps to the output"), 0 },
81 : { "reloc-debug-sections", OPT_RELOC_DEBUG, NULL, 0,
82 : N_("Resolve all trivial relocations between debug sections if the removed sections are placed in a debug file (only relevant for ET_REL files, operation is not reversable, needs -f)"), 0 },
83 : { "remove-comment", OPT_REMOVE_COMMENT, NULL, 0,
84 : N_("Remove .comment section"), 0 },
85 : { "remove-section", 'R', "SECTION", OPTION_HIDDEN, NULL, 0 },
86 : { "permissive", OPT_PERMISSIVE, NULL, 0,
87 : N_("Relax a few rules to handle slightly broken ELF files"), 0 },
88 : { NULL, 0, NULL, 0, NULL, 0 }
89 : };
90 :
91 : /* Short description of program. */
92 : static const char doc[] = N_("Discard symbols from object files.");
93 :
94 : /* Strings for arguments in help texts. */
95 : static const char args_doc[] = N_("[FILE...]");
96 :
97 : /* Prototype for option handler. */
98 : static error_t parse_opt (int key, char *arg, struct argp_state *state);
99 :
100 : /* Data structure to communicate with argp functions. */
101 : static struct argp argp =
102 : {
103 : options, parse_opt, args_doc, doc, NULL, NULL, NULL
104 : };
105 :
106 :
107 : /* Print symbols in file named FNAME. */
108 : static int process_file (const char *fname);
109 :
110 : /* Handle one ELF file. */
111 : static int handle_elf (int fd, Elf *elf, const char *prefix,
112 : const char *fname, mode_t mode, struct timespec tvp[2]);
113 :
114 : /* Handle all files contained in the archive. */
115 : static int handle_ar (int fd, Elf *elf, const char *prefix, const char *fname,
116 : struct timespec tvp[2]) __attribute__ ((unused));
117 :
118 : static int debug_fd = -1;
119 : static char *tmp_debug_fname = NULL;
120 :
121 : /* Close debug file descriptor, if opened. And remove temporary debug file. */
122 : static void cleanup_debug (void);
123 :
124 : #define INTERNAL_ERROR(fname) \
125 : do { \
126 : cleanup_debug (); \
127 : error (EXIT_FAILURE, 0, gettext ("%s: INTERNAL ERROR %d (%s): %s"), \
128 : fname, __LINE__, PACKAGE_VERSION, elf_errmsg (-1)); \
129 : } while (0)
130 :
131 :
132 : /* Name of the output file. */
133 : static const char *output_fname;
134 :
135 : /* Name of the debug output file. */
136 : static const char *debug_fname;
137 :
138 : /* Name to pretend the debug output file has. */
139 : static const char *debug_fname_embed;
140 :
141 : /* If true output files shall have same date as the input file. */
142 : static bool preserve_dates;
143 :
144 : /* If true .comment sections will be removed. */
145 : static bool remove_comment;
146 :
147 : /* If true remove all debug sections. */
148 : static bool remove_debug;
149 :
150 : /* If true remove all section headers. */
151 : static bool remove_shdrs;
152 :
153 : /* If true relax some ELF rules for input files. */
154 : static bool permissive;
155 :
156 : /* If true perform relocations between debug sections. */
157 : static bool reloc_debug;
158 :
159 :
160 : int
161 48 : main (int argc, char *argv[])
162 : {
163 : int remaining;
164 48 : int result = 0;
165 :
166 : /* We use no threads here which can interfere with handling a stream. */
167 48 : __fsetlocking (stdin, FSETLOCKING_BYCALLER);
168 48 : __fsetlocking (stdout, FSETLOCKING_BYCALLER);
169 48 : __fsetlocking (stderr, FSETLOCKING_BYCALLER);
170 :
171 : /* Set locale. */
172 48 : setlocale (LC_ALL, "");
173 :
174 : /* Make sure the message catalog can be found. */
175 48 : bindtextdomain (PACKAGE_TARNAME, LOCALEDIR);
176 :
177 : /* Initialize the message catalog. */
178 48 : textdomain (PACKAGE_TARNAME);
179 :
180 : /* Parse and process arguments. */
181 48 : if (argp_parse (&argp, argc, argv, 0, &remaining, NULL) != 0)
182 : return EXIT_FAILURE;
183 :
184 48 : if (reloc_debug && debug_fname == NULL)
185 : error (EXIT_FAILURE, 0,
186 0 : gettext ("--reloc-debug-sections used without -f"));
187 :
188 : /* Tell the library which version we are expecting. */
189 48 : elf_version (EV_CURRENT);
190 :
191 48 : if (remaining == argc)
192 : /* The user didn't specify a name so we use a.out. */
193 0 : result = process_file ("a.out");
194 : else
195 : {
196 : /* If we have seen the '-o' or '-f' option there must be exactly one
197 : input file. */
198 48 : if ((output_fname != NULL || debug_fname != NULL)
199 36 : && remaining + 1 < argc)
200 0 : error (EXIT_FAILURE, 0, gettext ("\
201 : Only one input file allowed together with '-o' and '-f'"));
202 :
203 : /* Process all the remaining files. */
204 : do
205 48 : result |= process_file (argv[remaining]);
206 48 : while (++remaining < argc);
207 : }
208 :
209 : return result;
210 : }
211 :
212 :
213 : /* Handle program arguments. */
214 : static error_t
215 322 : parse_opt (int key, char *arg, struct argp_state *state)
216 : {
217 322 : switch (key)
218 : {
219 : case 'f':
220 30 : if (debug_fname != NULL)
221 : {
222 0 : error (0, 0, gettext ("-f option specified twice"));
223 0 : return EINVAL;
224 : }
225 30 : debug_fname = arg;
226 30 : break;
227 :
228 : case 'F':
229 6 : if (debug_fname_embed != NULL)
230 : {
231 0 : error (0, 0, gettext ("-F option specified twice"));
232 0 : return EINVAL;
233 : }
234 6 : debug_fname_embed = arg;
235 6 : break;
236 :
237 : case 'o':
238 36 : if (output_fname != NULL)
239 : {
240 0 : error (0, 0, gettext ("-o option specified twice"));
241 0 : return EINVAL;
242 : }
243 36 : output_fname = arg;
244 36 : break;
245 :
246 : case 'p':
247 0 : preserve_dates = true;
248 0 : break;
249 :
250 : case OPT_RELOC_DEBUG:
251 10 : reloc_debug = true;
252 10 : break;
253 :
254 : case OPT_REMOVE_COMMENT:
255 0 : remove_comment = true;
256 0 : break;
257 :
258 : case 'R':
259 0 : if (!strcmp (arg, ".comment"))
260 0 : remove_comment = true;
261 : else
262 : {
263 0 : argp_error (state,
264 0 : gettext ("-R option supports only .comment section"));
265 0 : return EINVAL;
266 : }
267 0 : break;
268 :
269 : case 'g':
270 : case 'd':
271 : case 'S':
272 0 : remove_debug = true;
273 0 : break;
274 :
275 : case OPT_STRIP_SECTIONS:
276 0 : remove_shdrs = true;
277 0 : break;
278 :
279 : case OPT_PERMISSIVE:
280 0 : permissive = true;
281 0 : break;
282 :
283 : case 's': /* Ignored for compatibility. */
284 : break;
285 :
286 : default:
287 : return ARGP_ERR_UNKNOWN;
288 : }
289 : return 0;
290 : }
291 :
292 :
293 : static int
294 48 : process_file (const char *fname)
295 : {
296 : /* If we have to preserve the modify and access timestamps get them
297 : now. We cannot use fstat() after opening the file since the open
298 : would change the access time. */
299 : struct stat pre_st;
300 : struct timespec tv[2];
301 : again:
302 48 : if (preserve_dates)
303 : {
304 0 : if (stat (fname, &pre_st) != 0)
305 : {
306 0 : error (0, errno, gettext ("cannot stat input file '%s'"), fname);
307 0 : return 1;
308 : }
309 :
310 : /* If we have to preserve the timestamp, we need it in the
311 : format utimes() understands. */
312 0 : tv[0] = pre_st.st_atim;
313 0 : tv[1] = pre_st.st_mtim;
314 : }
315 :
316 : /* Open the file. */
317 48 : int fd = open (fname, output_fname == NULL ? O_RDWR : O_RDONLY);
318 48 : if (fd == -1)
319 : {
320 0 : error (0, errno, gettext ("while opening '%s'"), fname);
321 0 : return 1;
322 : }
323 :
324 : /* We always use fstat() even if we called stat() before. This is
325 : done to make sure the information returned by stat() is for the
326 : same file. */
327 : struct stat st;
328 48 : if (fstat (fd, &st) != 0)
329 : {
330 0 : error (0, errno, gettext ("cannot stat input file '%s'"), fname);
331 0 : return 1;
332 : }
333 : /* Paranoid mode on. */
334 48 : if (preserve_dates
335 0 : && (st.st_ino != pre_st.st_ino || st.st_dev != pre_st.st_dev))
336 : {
337 : /* We detected a race. Try again. */
338 0 : close (fd);
339 0 : goto again;
340 : }
341 :
342 : /* Now get the ELF descriptor. */
343 48 : Elf *elf = elf_begin (fd, output_fname == NULL ? ELF_C_RDWR : ELF_C_READ,
344 : NULL);
345 : int result;
346 48 : switch (elf_kind (elf))
347 : {
348 : case ELF_K_ELF:
349 48 : result = handle_elf (fd, elf, NULL, fname, st.st_mode & ACCESSPERMS,
350 48 : preserve_dates ? tv : NULL);
351 48 : break;
352 :
353 : case ELF_K_AR:
354 : /* It is not possible to strip the content of an archive direct
355 : the output to a specific file. */
356 0 : if (unlikely (output_fname != NULL || debug_fname != NULL))
357 : {
358 0 : error (0, 0, gettext ("%s: cannot use -o or -f when stripping archive"),
359 : fname);
360 0 : result = 1;
361 : }
362 : else
363 : {
364 : /* We would like to support ar archives, but currently it just
365 : doesn't work at all since we call elf_clone on the members
366 : which doesn't really support ar members.
367 : result = handle_ar (fd, elf, NULL, fname,
368 : preserve_dates ? tv : NULL);
369 : */
370 0 : error (0, 0, gettext ("%s: no support for stripping archive"),
371 : fname);
372 0 : result = 1;
373 : }
374 : break;
375 :
376 : default:
377 0 : error (0, 0, gettext ("%s: File format not recognized"), fname);
378 0 : result = 1;
379 0 : break;
380 : }
381 :
382 48 : if (unlikely (elf_end (elf) != 0))
383 0 : INTERNAL_ERROR (fname);
384 :
385 48 : close (fd);
386 :
387 48 : return result;
388 : }
389 :
390 :
391 : /* Maximum size of array allocated on stack. */
392 : #define MAX_STACK_ALLOC (400 * 1024)
393 :
394 : static int
395 48 : handle_elf (int fd, Elf *elf, const char *prefix, const char *fname,
396 : mode_t mode, struct timespec tvp[2])
397 : {
398 48 : size_t prefix_len = prefix == NULL ? 0 : strlen (prefix);
399 48 : size_t fname_len = strlen (fname) + 1;
400 48 : char *fullname = alloca (prefix_len + 1 + fname_len);
401 48 : char *cp = fullname;
402 48 : Elf *debugelf = NULL;
403 48 : tmp_debug_fname = NULL;
404 48 : int result = 0;
405 48 : size_t shdridx = 0;
406 : size_t shstrndx;
407 : struct shdr_info
408 : {
409 : Elf_Scn *scn;
410 : GElf_Shdr shdr;
411 : Elf_Data *data;
412 : Elf_Data *debug_data;
413 : const char *name;
414 : Elf32_Word idx; /* Index in new file. */
415 : Elf32_Word old_sh_link; /* Original value of shdr.sh_link. */
416 : Elf32_Word symtab_idx;
417 : Elf32_Word version_idx;
418 : Elf32_Word group_idx;
419 : Elf32_Word group_cnt;
420 : Elf_Scn *newscn;
421 : Dwelf_Strent *se;
422 : Elf32_Word *newsymidx;
423 48 : } *shdr_info = NULL;
424 : Elf_Scn *scn;
425 : size_t cnt;
426 : size_t idx;
427 : bool changes;
428 : GElf_Ehdr newehdr_mem;
429 : GElf_Ehdr *newehdr;
430 : GElf_Ehdr debugehdr_mem;
431 : GElf_Ehdr *debugehdr;
432 48 : Dwelf_Strtab *shst = NULL;
433 : Elf_Data debuglink_crc_data;
434 48 : bool any_symtab_changes = false;
435 48 : Elf_Data *shstrtab_data = NULL;
436 48 : void *debuglink_buf = NULL;
437 :
438 : /* Create the full name of the file. */
439 48 : if (prefix != NULL)
440 : {
441 0 : cp = mempcpy (cp, prefix, prefix_len);
442 0 : *cp++ = ':';
443 : }
444 48 : memcpy (cp, fname, fname_len);
445 :
446 : /* If we are not replacing the input file open a new file here. */
447 48 : if (output_fname != NULL)
448 : {
449 36 : fd = open (output_fname, O_RDWR | O_CREAT, mode);
450 36 : if (unlikely (fd == -1))
451 : {
452 0 : error (0, errno, gettext ("cannot open '%s'"), output_fname);
453 0 : return 1;
454 : }
455 : }
456 :
457 48 : debug_fd = -1;
458 :
459 : /* Get the EBL handling. Removing all debugging symbols with the -g
460 : option or resolving all relocations between debug sections with
461 : the --reloc-debug-sections option are currently the only reasons
462 : we need EBL so don't open the backend unless necessary. */
463 48 : Ebl *ebl = NULL;
464 48 : if (remove_debug || reloc_debug)
465 : {
466 10 : ebl = ebl_openbackend (elf);
467 10 : if (ebl == NULL)
468 : {
469 0 : error (0, errno, gettext ("cannot open EBL backend"));
470 0 : result = 1;
471 0 : goto fail;
472 : }
473 : }
474 :
475 : /* Open the additional file the debug information will be stored in. */
476 48 : if (debug_fname != NULL)
477 : {
478 : /* Create a temporary file name. We do not want to overwrite
479 : the debug file if the file would not contain any
480 : information. */
481 30 : size_t debug_fname_len = strlen (debug_fname);
482 30 : tmp_debug_fname = (char *) xmalloc (debug_fname_len + sizeof (".XXXXXX"));
483 30 : strcpy (mempcpy (tmp_debug_fname, debug_fname, debug_fname_len),
484 : ".XXXXXX");
485 :
486 30 : debug_fd = mkstemp (tmp_debug_fname);
487 30 : if (unlikely (debug_fd == -1))
488 : {
489 0 : error (0, errno, gettext ("cannot open '%s'"), debug_fname);
490 0 : result = 1;
491 0 : goto fail;
492 : }
493 : }
494 :
495 : /* Get the information from the old file. */
496 : GElf_Ehdr ehdr_mem;
497 48 : GElf_Ehdr *ehdr = gelf_getehdr (elf, &ehdr_mem);
498 48 : if (ehdr == NULL)
499 0 : INTERNAL_ERROR (fname);
500 :
501 : /* Get the section header string table index. */
502 48 : if (unlikely (elf_getshdrstrndx (elf, &shstrndx) < 0))
503 : {
504 0 : cleanup_debug ();
505 : error (EXIT_FAILURE, 0,
506 0 : gettext ("cannot get section header string table index"));
507 : }
508 :
509 : /* Get the number of phdrs in the old file. */
510 : size_t phnum;
511 48 : if (elf_getphdrnum (elf, &phnum) != 0)
512 : {
513 0 : cleanup_debug ();
514 0 : error (EXIT_FAILURE, 0, gettext ("cannot get number of phdrs"));
515 : }
516 :
517 : /* We now create a new ELF descriptor for the same file. We
518 : construct it almost exactly in the same way with some information
519 : dropped. */
520 : Elf *newelf;
521 48 : if (output_fname != NULL)
522 36 : newelf = elf_begin (fd, ELF_C_WRITE_MMAP, NULL);
523 : else
524 12 : newelf = elf_clone (elf, ELF_C_EMPTY);
525 :
526 48 : if (unlikely (gelf_newehdr (newelf, gelf_getclass (elf)) == 0)
527 48 : || (ehdr->e_type != ET_REL
528 22 : && unlikely (gelf_newphdr (newelf, phnum) == 0)))
529 : {
530 0 : error (0, 0, gettext ("cannot create new file '%s': %s"),
531 0 : output_fname ?: fname, elf_errmsg (-1));
532 : goto fail;
533 : }
534 :
535 : /* Copy over the old program header if needed. */
536 48 : if (ehdr->e_type != ET_REL)
537 180 : for (cnt = 0; cnt < phnum; ++cnt)
538 : {
539 : GElf_Phdr phdr_mem;
540 158 : GElf_Phdr *phdr = gelf_getphdr (elf, cnt, &phdr_mem);
541 158 : if (phdr == NULL
542 158 : || unlikely (gelf_update_phdr (newelf, cnt, phdr) == 0))
543 0 : INTERNAL_ERROR (fname);
544 : }
545 :
546 48 : if (debug_fname != NULL)
547 : {
548 : /* Also create an ELF descriptor for the debug file */
549 30 : debugelf = elf_begin (debug_fd, ELF_C_WRITE_MMAP, NULL);
550 30 : if (unlikely (gelf_newehdr (debugelf, gelf_getclass (elf)) == 0)
551 30 : || (ehdr->e_type != ET_REL
552 8 : && unlikely (gelf_newphdr (debugelf, phnum) == 0)))
553 : {
554 0 : error (0, 0, gettext ("cannot create new file '%s': %s"),
555 : debug_fname, elf_errmsg (-1));
556 : goto fail_close;
557 : }
558 :
559 : /* Copy over the old program header if needed. */
560 30 : if (ehdr->e_type != ET_REL)
561 68 : for (cnt = 0; cnt < phnum; ++cnt)
562 : {
563 : GElf_Phdr phdr_mem;
564 60 : GElf_Phdr *phdr = gelf_getphdr (elf, cnt, &phdr_mem);
565 60 : if (phdr == NULL
566 60 : || unlikely (gelf_update_phdr (debugelf, cnt, phdr) == 0))
567 0 : INTERNAL_ERROR (fname);
568 : }
569 : }
570 :
571 : /* Number of sections. */
572 : size_t shnum;
573 48 : if (unlikely (elf_getshdrnum (elf, &shnum) < 0))
574 : {
575 0 : error (0, 0, gettext ("cannot determine number of sections: %s"),
576 : elf_errmsg (-1));
577 : goto fail_close;
578 : }
579 :
580 48 : if (shstrndx >= shnum)
581 : goto illformed;
582 :
583 : #define elf_assert(test) do { if (!(test)) goto illformed; } while (0)
584 :
585 : /* Storage for section information. We leave room for two more
586 : entries since we unconditionally create a section header string
587 : table. Maybe some weird tool created an ELF file without one.
588 : The other one is used for the debug link section. */
589 48 : if ((shnum + 2) * sizeof (struct shdr_info) > MAX_STACK_ALLOC)
590 0 : shdr_info = (struct shdr_info *) xcalloc (shnum + 2,
591 : sizeof (struct shdr_info));
592 : else
593 : {
594 48 : shdr_info = (struct shdr_info *) alloca ((shnum + 2)
595 : * sizeof (struct shdr_info));
596 48 : memset (shdr_info, '\0', (shnum + 2) * sizeof (struct shdr_info));
597 : }
598 :
599 : /* Prepare section information data structure. */
600 48 : scn = NULL;
601 48 : cnt = 1;
602 1622 : while ((scn = elf_nextscn (elf, scn)) != NULL)
603 : {
604 : /* This should always be true (i.e., there should not be any
605 : holes in the numbering). */
606 1526 : elf_assert (elf_ndxscn (scn) == cnt);
607 :
608 1526 : shdr_info[cnt].scn = scn;
609 :
610 : /* Get the header. */
611 1526 : if (gelf_getshdr (scn, &shdr_info[cnt].shdr) == NULL)
612 0 : INTERNAL_ERROR (fname);
613 :
614 : /* Get the name of the section. */
615 3052 : shdr_info[cnt].name = elf_strptr (elf, shstrndx,
616 1526 : shdr_info[cnt].shdr.sh_name);
617 1526 : if (shdr_info[cnt].name == NULL)
618 : {
619 : illformed:
620 0 : error (0, 0, gettext ("illformed file '%s'"), fname);
621 : goto fail_close;
622 : }
623 :
624 : /* Mark them as present but not yet investigated. */
625 1526 : shdr_info[cnt].idx = 1;
626 :
627 : /* Remember the shdr.sh_link value. */
628 1526 : shdr_info[cnt].old_sh_link = shdr_info[cnt].shdr.sh_link;
629 1526 : if (shdr_info[cnt].old_sh_link >= shnum)
630 : goto illformed;
631 :
632 : /* Sections in files other than relocatable object files which
633 : not loaded can be freely moved by us. In theory we can also
634 : freely move around allocated nobits sections. But we don't
635 : to keep the layout of all allocated sections as similar as
636 : possible to the original file. In relocatable object files
637 : everything can be moved. */
638 1526 : if (ehdr->e_type == ET_REL
639 763 : || (shdr_info[cnt].shdr.sh_flags & SHF_ALLOC) == 0)
640 1009 : shdr_info[cnt].shdr.sh_offset = 0;
641 :
642 : /* If this is an extended section index table store an
643 : appropriate reference. */
644 1526 : if (unlikely (shdr_info[cnt].shdr.sh_type == SHT_SYMTAB_SHNDX))
645 : {
646 0 : elf_assert (shdr_info[shdr_info[cnt].shdr.sh_link].symtab_idx == 0);
647 0 : shdr_info[shdr_info[cnt].shdr.sh_link].symtab_idx = cnt;
648 : }
649 1526 : else if (unlikely (shdr_info[cnt].shdr.sh_type == SHT_GROUP))
650 : {
651 : /* Cross-reference the sections contained in the section
652 : group. */
653 3 : shdr_info[cnt].data = elf_getdata (shdr_info[cnt].scn, NULL);
654 3 : if (shdr_info[cnt].data == NULL
655 3 : || shdr_info[cnt].data->d_size < sizeof (Elf32_Word))
656 0 : INTERNAL_ERROR (fname);
657 :
658 : /* XXX Fix for unaligned access. */
659 3 : Elf32_Word *grpref = (Elf32_Word *) shdr_info[cnt].data->d_buf;
660 : size_t inner;
661 9 : for (inner = 1;
662 6 : inner < shdr_info[cnt].data->d_size / sizeof (Elf32_Word);
663 3 : ++inner)
664 : {
665 3 : if (grpref[inner] < shnum)
666 3 : shdr_info[grpref[inner]].group_idx = cnt;
667 : else
668 : goto illformed;
669 : }
670 :
671 3 : if (inner == 1 || (inner == 2 && (grpref[0] & GRP_COMDAT) == 0))
672 : /* If the section group contains only one element and this
673 : is n COMDAT section we can drop it right away. */
674 0 : shdr_info[cnt].idx = 0;
675 : else
676 3 : shdr_info[cnt].group_cnt = inner - 1;
677 : }
678 1523 : else if (unlikely (shdr_info[cnt].shdr.sh_type == SHT_GNU_versym))
679 : {
680 22 : elf_assert (shdr_info[shdr_info[cnt].shdr.sh_link].version_idx == 0);
681 22 : shdr_info[shdr_info[cnt].shdr.sh_link].version_idx = cnt;
682 : }
683 :
684 : /* If this section is part of a group make sure it is not
685 : discarded right away. */
686 1526 : if ((shdr_info[cnt].shdr.sh_flags & SHF_GROUP) != 0)
687 : {
688 3 : elf_assert (shdr_info[cnt].group_idx != 0);
689 :
690 3 : if (shdr_info[shdr_info[cnt].group_idx].idx == 0)
691 : {
692 : /* The section group section will be removed. */
693 0 : shdr_info[cnt].group_idx = 0;
694 0 : shdr_info[cnt].shdr.sh_flags &= ~SHF_GROUP;
695 : }
696 : }
697 :
698 : /* Increment the counter. */
699 1526 : ++cnt;
700 : }
701 :
702 : /* Now determine which sections can go away. The general rule is that
703 : all sections which are not used at runtime are stripped out. But
704 : there are a few exceptions:
705 :
706 : - special sections named ".comment" and ".note" are kept
707 : - OS or architecture specific sections are kept since we might not
708 : know how to handle them
709 : - if a section is referred to from a section which is not removed
710 : in the sh_link or sh_info element it cannot be removed either
711 : */
712 1574 : for (cnt = 1; cnt < shnum; ++cnt)
713 : /* Check whether the section can be removed. */
714 3052 : if (remove_shdrs ? !(shdr_info[cnt].shdr.sh_flags & SHF_ALLOC)
715 3052 : : ebl_section_strip_p (ebl, ehdr, &shdr_info[cnt].shdr,
716 1526 : shdr_info[cnt].name, remove_comment,
717 : remove_debug))
718 : {
719 : /* For now assume this section will be removed. */
720 744 : shdr_info[cnt].idx = 0;
721 :
722 744 : idx = shdr_info[cnt].group_idx;
723 1489 : while (idx != 0)
724 : {
725 : /* The section group data is already loaded. */
726 1 : elf_assert (shdr_info[idx].data != NULL
727 : && shdr_info[idx].data->d_buf != NULL
728 : && shdr_info[idx].data->d_size >= sizeof (Elf32_Word));
729 :
730 : /* If the references section group is a normal section
731 : group and has one element remaining, or if it is an
732 : empty COMDAT section group it is removed. */
733 2 : bool is_comdat = (((Elf32_Word *) shdr_info[idx].data->d_buf)[0]
734 1 : & GRP_COMDAT) != 0;
735 :
736 1 : --shdr_info[idx].group_cnt;
737 1 : if ((!is_comdat && shdr_info[idx].group_cnt == 1)
738 1 : || (is_comdat && shdr_info[idx].group_cnt == 0))
739 : {
740 1 : shdr_info[idx].idx = 0;
741 : /* Continue recursively. */
742 1 : idx = shdr_info[idx].group_idx;
743 : }
744 : else
745 : break;
746 : }
747 : }
748 :
749 : /* Mark the SHT_NULL section as handled. */
750 48 : shdr_info[0].idx = 2;
751 :
752 :
753 : /* Handle exceptions: section groups and cross-references. We might
754 : have to repeat this a few times since the resetting of the flag
755 : might propagate. */
756 : do
757 : {
758 48 : changes = false;
759 :
760 1574 : for (cnt = 1; cnt < shnum; ++cnt)
761 : {
762 1526 : if (shdr_info[cnt].idx == 0)
763 : {
764 : /* If a relocation section is marked as being removed make
765 : sure the section it is relocating is removed, too. */
766 1384 : if (shdr_info[cnt].shdr.sh_type == SHT_REL
767 692 : || shdr_info[cnt].shdr.sh_type == SHT_RELA)
768 : {
769 234 : if (shdr_info[cnt].shdr.sh_info >= shnum)
770 : goto illformed;
771 234 : else if (shdr_info[shdr_info[cnt].shdr.sh_info].idx != 0)
772 104 : shdr_info[cnt].idx = 1;
773 : }
774 :
775 : /* If a group section is marked as being removed make
776 : sure all the sections it contains are being removed, too. */
777 692 : if (shdr_info[cnt].shdr.sh_type == SHT_GROUP)
778 : {
779 : Elf32_Word *grpref;
780 3 : grpref = (Elf32_Word *) shdr_info[cnt].data->d_buf;
781 7 : for (size_t in = 1;
782 4 : in < shdr_info[cnt].data->d_size / sizeof (Elf32_Word);
783 1 : ++in)
784 3 : if (grpref[in] < shnum)
785 : {
786 3 : if (shdr_info[grpref[in]].idx != 0)
787 : {
788 2 : shdr_info[cnt].idx = 1;
789 2 : break;
790 : }
791 : }
792 : else
793 : goto illformed;
794 : }
795 : }
796 :
797 1526 : if (shdr_info[cnt].idx == 1)
798 : {
799 : /* The content of symbol tables we don't remove must not
800 : reference any section which we do remove. Otherwise
801 : we cannot remove the section. */
802 940 : if (debug_fname != NULL
803 554 : && shdr_info[cnt].debug_data == NULL
804 1020 : && (shdr_info[cnt].shdr.sh_type == SHT_DYNSYM
805 510 : || shdr_info[cnt].shdr.sh_type == SHT_SYMTAB))
806 : {
807 : /* Make sure the data is loaded. */
808 8 : if (shdr_info[cnt].data == NULL)
809 : {
810 : shdr_info[cnt].data
811 8 : = elf_getdata (shdr_info[cnt].scn, NULL);
812 8 : if (shdr_info[cnt].data == NULL)
813 0 : INTERNAL_ERROR (fname);
814 : }
815 8 : Elf_Data *symdata = shdr_info[cnt].data;
816 :
817 : /* If there is an extended section index table load it
818 : as well. */
819 8 : if (shdr_info[cnt].symtab_idx != 0
820 0 : && shdr_info[shdr_info[cnt].symtab_idx].data == NULL)
821 : {
822 0 : elf_assert (shdr_info[cnt].shdr.sh_type == SHT_SYMTAB);
823 :
824 : shdr_info[shdr_info[cnt].symtab_idx].data
825 0 : = elf_getdata (shdr_info[shdr_info[cnt].symtab_idx].scn,
826 : NULL);
827 0 : if (shdr_info[shdr_info[cnt].symtab_idx].data == NULL)
828 0 : INTERNAL_ERROR (fname);
829 : }
830 8 : Elf_Data *xndxdata
831 8 : = shdr_info[shdr_info[cnt].symtab_idx].data;
832 :
833 : /* Go through all symbols and make sure the section they
834 : reference is not removed. */
835 8 : size_t elsize = gelf_fsize (elf, ELF_T_SYM, 1, EV_CURRENT);
836 :
837 371 : for (size_t inner = 0;
838 363 : inner < shdr_info[cnt].data->d_size / elsize;
839 355 : ++inner)
840 : {
841 : GElf_Sym sym_mem;
842 : Elf32_Word xndx;
843 355 : GElf_Sym *sym = gelf_getsymshndx (symdata, xndxdata,
844 : inner, &sym_mem,
845 : &xndx);
846 355 : if (sym == NULL)
847 0 : INTERNAL_ERROR (fname);
848 :
849 355 : size_t scnidx = sym->st_shndx;
850 355 : if (scnidx == SHN_UNDEF || scnidx >= shnum
851 82 : || (scnidx >= SHN_LORESERVE
852 : && scnidx <= SHN_HIRESERVE
853 82 : && scnidx != SHN_XINDEX)
854 : /* Don't count in the section symbols. */
855 82 : || GELF_ST_TYPE (sym->st_info) == STT_SECTION)
856 : /* This is no section index, leave it alone. */
857 305 : continue;
858 50 : else if (scnidx == SHN_XINDEX)
859 0 : scnidx = xndx;
860 :
861 50 : if (scnidx >= shnum)
862 : goto illformed;
863 :
864 50 : if (shdr_info[scnidx].idx == 0)
865 : /* This symbol table has a real symbol in
866 : a discarded section. So preserve the
867 : original table in the debug file. */
868 0 : shdr_info[cnt].debug_data = symdata;
869 : }
870 : }
871 :
872 : /* Cross referencing happens:
873 : - for the cases the ELF specification says. That are
874 : + SHT_DYNAMIC in sh_link to string table
875 : + SHT_HASH in sh_link to symbol table
876 : + SHT_REL and SHT_RELA in sh_link to symbol table
877 : + SHT_SYMTAB and SHT_DYNSYM in sh_link to string table
878 : + SHT_GROUP in sh_link to symbol table
879 : + SHT_SYMTAB_SHNDX in sh_link to symbol table
880 : Other (OS or architecture-specific) sections might as
881 : well use this field so we process it unconditionally.
882 : - references inside section groups
883 : - specially marked references in sh_info if the SHF_INFO_LINK
884 : flag is set
885 : */
886 :
887 940 : if (shdr_info[shdr_info[cnt].shdr.sh_link].idx == 0)
888 : {
889 52 : shdr_info[shdr_info[cnt].shdr.sh_link].idx = 1;
890 52 : changes |= shdr_info[cnt].shdr.sh_link < cnt;
891 : }
892 :
893 : /* Handle references through sh_info. */
894 940 : if (SH_INFO_LINK_P (&shdr_info[cnt].shdr))
895 : {
896 146 : if (shdr_info[cnt].shdr.sh_info >= shnum)
897 : goto illformed;
898 146 : else if ( shdr_info[shdr_info[cnt].shdr.sh_info].idx == 0)
899 : {
900 0 : shdr_info[shdr_info[cnt].shdr.sh_info].idx = 1;
901 0 : changes |= shdr_info[cnt].shdr.sh_info < cnt;
902 : }
903 : }
904 :
905 : /* Mark the section as investigated. */
906 940 : shdr_info[cnt].idx = 2;
907 : }
908 :
909 1526 : if (debug_fname != NULL
910 940 : && (shdr_info[cnt].idx == 0 || shdr_info[cnt].debug_data != NULL))
911 : {
912 : /* This section is being preserved in the debug file.
913 : Sections it refers to must be preserved there too.
914 :
915 : In this pass we mark sections to be preserved in both
916 : files by setting the .debug_data pointer to the original
917 : file's .data pointer. Below, we'll copy the section
918 : contents. */
919 :
920 540 : inline void check_preserved (size_t i)
921 : {
922 540 : if (i != 0 && i < shnum + 2 && shdr_info[i].idx != 0
923 133 : && shdr_info[i].debug_data == NULL)
924 : {
925 44 : if (shdr_info[i].data == NULL)
926 44 : shdr_info[i].data = elf_getdata (shdr_info[i].scn, NULL);
927 44 : if (shdr_info[i].data == NULL)
928 0 : INTERNAL_ERROR (fname);
929 :
930 44 : shdr_info[i].debug_data = shdr_info[i].data;
931 44 : changes |= i < cnt;
932 : }
933 540 : }
934 :
935 430 : check_preserved (shdr_info[cnt].shdr.sh_link);
936 430 : if (SH_INFO_LINK_P (&shdr_info[cnt].shdr))
937 110 : check_preserved (shdr_info[cnt].shdr.sh_info);
938 : }
939 : }
940 : }
941 48 : while (changes);
942 :
943 : /* Copy the removed sections to the debug output file.
944 : The ones that are not removed in the stripped file are SHT_NOBITS. */
945 48 : if (debug_fname != NULL)
946 : {
947 970 : for (cnt = 1; cnt < shnum; ++cnt)
948 : {
949 940 : scn = elf_newscn (debugelf);
950 940 : if (scn == NULL)
951 : {
952 0 : cleanup_debug ();
953 0 : error (EXIT_FAILURE, 0,
954 0 : gettext ("while generating output file: %s"),
955 : elf_errmsg (-1));
956 : }
957 :
958 1880 : bool discard_section = (shdr_info[cnt].idx > 0
959 554 : && shdr_info[cnt].debug_data == NULL
960 510 : && shdr_info[cnt].shdr.sh_type != SHT_NOTE
961 486 : && shdr_info[cnt].shdr.sh_type != SHT_GROUP
962 1424 : && cnt != ehdr->e_shstrndx);
963 :
964 : /* Set the section header in the new file. */
965 940 : GElf_Shdr debugshdr = shdr_info[cnt].shdr;
966 940 : if (discard_section)
967 484 : debugshdr.sh_type = SHT_NOBITS;
968 :
969 940 : if (unlikely (gelf_update_shdr (scn, &debugshdr) == 0))
970 : /* There cannot be any overflows. */
971 0 : INTERNAL_ERROR (fname);
972 :
973 : /* Get the data from the old file if necessary. */
974 940 : if (shdr_info[cnt].data == NULL)
975 : {
976 885 : shdr_info[cnt].data = elf_getdata (shdr_info[cnt].scn, NULL);
977 885 : if (shdr_info[cnt].data == NULL)
978 0 : INTERNAL_ERROR (fname);
979 : }
980 :
981 : /* Set the data. This is done by copying from the old file. */
982 940 : Elf_Data *debugdata = elf_newdata (scn);
983 940 : if (debugdata == NULL)
984 0 : INTERNAL_ERROR (fname);
985 :
986 : /* Copy the structure. This data may be modified in place
987 : before we write out the file. */
988 940 : *debugdata = *shdr_info[cnt].data;
989 940 : if (discard_section)
990 484 : debugdata->d_buf = NULL;
991 456 : else if (shdr_info[cnt].debug_data != NULL
992 412 : || shdr_info[cnt].shdr.sh_type == SHT_GROUP)
993 : {
994 : /* Copy the original data before it gets modified. */
995 47 : shdr_info[cnt].debug_data = debugdata;
996 47 : if (debugdata->d_buf == NULL)
997 0 : INTERNAL_ERROR (fname);
998 47 : debugdata->d_buf = memcpy (xmalloc (debugdata->d_size),
999 : debugdata->d_buf, debugdata->d_size);
1000 : }
1001 : }
1002 :
1003 : /* Finish the ELF header. Fill in the fields not handled by
1004 : libelf from the old file. */
1005 30 : debugehdr = gelf_getehdr (debugelf, &debugehdr_mem);
1006 30 : if (debugehdr == NULL)
1007 0 : INTERNAL_ERROR (fname);
1008 :
1009 30 : memcpy (debugehdr->e_ident, ehdr->e_ident, EI_NIDENT);
1010 30 : debugehdr->e_type = ehdr->e_type;
1011 30 : debugehdr->e_machine = ehdr->e_machine;
1012 30 : debugehdr->e_version = ehdr->e_version;
1013 30 : debugehdr->e_entry = ehdr->e_entry;
1014 30 : debugehdr->e_flags = ehdr->e_flags;
1015 30 : debugehdr->e_shstrndx = ehdr->e_shstrndx;
1016 :
1017 30 : if (unlikely (gelf_update_ehdr (debugelf, debugehdr) == 0))
1018 : {
1019 0 : error (0, 0, gettext ("%s: error while creating ELF header: %s"),
1020 : debug_fname, elf_errmsg (-1));
1021 0 : result = 1;
1022 0 : goto fail_close;
1023 : }
1024 : }
1025 :
1026 : /* Although we always create a new section header string table we
1027 : don't explicitly mark the existing one as unused. It can still
1028 : be used through a symbol table section we are keeping. If not it
1029 : will already be marked as unused. */
1030 :
1031 : /* We need a string table for the section headers. */
1032 48 : shst = dwelf_strtab_init (true);
1033 48 : if (shst == NULL)
1034 : {
1035 0 : cleanup_debug ();
1036 0 : error (EXIT_FAILURE, errno, gettext ("while preparing output for '%s'"),
1037 0 : output_fname ?: fname);
1038 : }
1039 :
1040 : /* Assign new section numbers. */
1041 48 : shdr_info[0].idx = 0;
1042 1574 : for (cnt = idx = 1; cnt < shnum; ++cnt)
1043 1526 : if (shdr_info[cnt].idx > 0)
1044 : {
1045 940 : shdr_info[cnt].idx = idx++;
1046 :
1047 : /* Create a new section. */
1048 940 : shdr_info[cnt].newscn = elf_newscn (newelf);
1049 940 : if (shdr_info[cnt].newscn == NULL)
1050 : {
1051 0 : cleanup_debug ();
1052 0 : error (EXIT_FAILURE, 0,
1053 0 : gettext ("while generating output file: %s"),
1054 : elf_errmsg (-1));
1055 : }
1056 :
1057 940 : elf_assert (elf_ndxscn (shdr_info[cnt].newscn) == shdr_info[cnt].idx);
1058 :
1059 : /* Add this name to the section header string table. */
1060 940 : shdr_info[cnt].se = dwelf_strtab_add (shst, shdr_info[cnt].name);
1061 : }
1062 :
1063 : /* Test whether we are doing anything at all. */
1064 48 : if (cnt == idx)
1065 : /* Nope, all removable sections are already gone. */
1066 : goto fail_close;
1067 :
1068 : /* Create the reference to the file with the debug info. */
1069 48 : if (debug_fname != NULL && !remove_shdrs)
1070 : {
1071 : /* Add the section header string table section name. */
1072 30 : shdr_info[cnt].se = dwelf_strtab_add_len (shst, ".gnu_debuglink", 15);
1073 30 : shdr_info[cnt].idx = idx++;
1074 :
1075 : /* Create the section header. */
1076 30 : shdr_info[cnt].shdr.sh_type = SHT_PROGBITS;
1077 30 : shdr_info[cnt].shdr.sh_flags = 0;
1078 30 : shdr_info[cnt].shdr.sh_addr = 0;
1079 30 : shdr_info[cnt].shdr.sh_link = SHN_UNDEF;
1080 30 : shdr_info[cnt].shdr.sh_info = SHN_UNDEF;
1081 30 : shdr_info[cnt].shdr.sh_entsize = 0;
1082 30 : shdr_info[cnt].shdr.sh_addralign = 4;
1083 : /* We set the offset to zero here. Before we write the ELF file the
1084 : field must have the correct value. This is done in the final
1085 : loop over all section. Then we have all the information needed. */
1086 30 : shdr_info[cnt].shdr.sh_offset = 0;
1087 :
1088 : /* Create the section. */
1089 30 : shdr_info[cnt].newscn = elf_newscn (newelf);
1090 30 : if (shdr_info[cnt].newscn == NULL)
1091 : {
1092 0 : cleanup_debug ();
1093 0 : error (EXIT_FAILURE, 0,
1094 0 : gettext ("while create section header section: %s"),
1095 : elf_errmsg (-1));
1096 : }
1097 30 : elf_assert (elf_ndxscn (shdr_info[cnt].newscn) == shdr_info[cnt].idx);
1098 :
1099 30 : shdr_info[cnt].data = elf_newdata (shdr_info[cnt].newscn);
1100 30 : if (shdr_info[cnt].data == NULL)
1101 : {
1102 0 : cleanup_debug ();
1103 0 : error (EXIT_FAILURE, 0, gettext ("cannot allocate section data: %s"),
1104 : elf_errmsg (-1));
1105 : }
1106 :
1107 30 : char *debug_basename = basename (debug_fname_embed ?: debug_fname);
1108 30 : off_t crc_offset = strlen (debug_basename) + 1;
1109 : /* Align to 4 byte boundary */
1110 30 : crc_offset = ((crc_offset - 1) & ~3) + 4;
1111 :
1112 30 : shdr_info[cnt].data->d_align = 4;
1113 30 : shdr_info[cnt].shdr.sh_size = shdr_info[cnt].data->d_size
1114 30 : = crc_offset + 4;
1115 30 : debuglink_buf = xcalloc (1, shdr_info[cnt].data->d_size);
1116 30 : shdr_info[cnt].data->d_buf = debuglink_buf;
1117 :
1118 30 : strcpy (shdr_info[cnt].data->d_buf, debug_basename);
1119 :
1120 : /* Cache this Elf_Data describing the CRC32 word in the section.
1121 : We'll fill this in when we have written the debug file. */
1122 30 : debuglink_crc_data = *shdr_info[cnt].data;
1123 60 : debuglink_crc_data.d_buf = ((char *) debuglink_crc_data.d_buf
1124 30 : + crc_offset);
1125 30 : debuglink_crc_data.d_size = 4;
1126 :
1127 : /* One more section done. */
1128 30 : ++cnt;
1129 : }
1130 :
1131 : /* Index of the section header table in the shdr_info array. */
1132 48 : shdridx = cnt;
1133 :
1134 : /* Add the section header string table section name. */
1135 48 : shdr_info[cnt].se = dwelf_strtab_add_len (shst, ".shstrtab", 10);
1136 48 : shdr_info[cnt].idx = idx;
1137 :
1138 : /* Create the section header. */
1139 48 : shdr_info[cnt].shdr.sh_type = SHT_STRTAB;
1140 48 : shdr_info[cnt].shdr.sh_flags = 0;
1141 48 : shdr_info[cnt].shdr.sh_addr = 0;
1142 48 : shdr_info[cnt].shdr.sh_link = SHN_UNDEF;
1143 48 : shdr_info[cnt].shdr.sh_info = SHN_UNDEF;
1144 48 : shdr_info[cnt].shdr.sh_entsize = 0;
1145 : /* We set the offset to zero here. Before we write the ELF file the
1146 : field must have the correct value. This is done in the final
1147 : loop over all section. Then we have all the information needed. */
1148 48 : shdr_info[cnt].shdr.sh_offset = 0;
1149 48 : shdr_info[cnt].shdr.sh_addralign = 1;
1150 :
1151 : /* Create the section. */
1152 48 : shdr_info[cnt].newscn = elf_newscn (newelf);
1153 48 : if (shdr_info[cnt].newscn == NULL)
1154 : {
1155 0 : cleanup_debug ();
1156 0 : error (EXIT_FAILURE, 0,
1157 0 : gettext ("while create section header section: %s"),
1158 : elf_errmsg (-1));
1159 : }
1160 48 : elf_assert (elf_ndxscn (shdr_info[cnt].newscn) == idx);
1161 :
1162 : /* Finalize the string table and fill in the correct indices in the
1163 : section headers. */
1164 48 : shstrtab_data = elf_newdata (shdr_info[cnt].newscn);
1165 48 : if (shstrtab_data == NULL)
1166 : {
1167 0 : cleanup_debug ();
1168 0 : error (EXIT_FAILURE, 0,
1169 0 : gettext ("while create section header string table: %s"),
1170 : elf_errmsg (-1));
1171 : }
1172 48 : if (dwelf_strtab_finalize (shst, shstrtab_data) == NULL)
1173 : {
1174 0 : cleanup_debug ();
1175 : error (EXIT_FAILURE, 0,
1176 0 : gettext ("no memory to create section header string table"));
1177 : }
1178 :
1179 : /* We have to set the section size. */
1180 48 : shdr_info[cnt].shdr.sh_size = shstrtab_data->d_size;
1181 :
1182 : /* Update the section information. */
1183 48 : GElf_Off lastoffset = 0;
1184 1652 : for (cnt = 1; cnt <= shdridx; ++cnt)
1185 1604 : if (shdr_info[cnt].idx > 0)
1186 : {
1187 : Elf_Data *newdata;
1188 :
1189 1018 : scn = elf_getscn (newelf, shdr_info[cnt].idx);
1190 1018 : elf_assert (scn != NULL);
1191 :
1192 : /* Update the name. */
1193 1018 : shdr_info[cnt].shdr.sh_name = dwelf_strent_off (shdr_info[cnt].se);
1194 :
1195 : /* Update the section header from the input file. Some fields
1196 : might be section indeces which now have to be adjusted. */
1197 1018 : if (shdr_info[cnt].shdr.sh_link != 0)
1198 286 : shdr_info[cnt].shdr.sh_link =
1199 286 : shdr_info[shdr_info[cnt].shdr.sh_link].idx;
1200 :
1201 1018 : if (shdr_info[cnt].shdr.sh_type == SHT_GROUP)
1202 : {
1203 2 : elf_assert (shdr_info[cnt].data != NULL
1204 : && shdr_info[cnt].data->d_buf != NULL);
1205 :
1206 : Elf32_Word *grpref = (Elf32_Word *) shdr_info[cnt].data->d_buf;
1207 6 : for (size_t inner = 0;
1208 6 : inner < shdr_info[cnt].data->d_size / sizeof (Elf32_Word);
1209 4 : ++inner)
1210 4 : if (grpref[inner] < shnum)
1211 4 : grpref[inner] = shdr_info[grpref[inner]].idx;
1212 : else
1213 : goto illformed;
1214 : }
1215 :
1216 : /* Handle the SHT_REL, SHT_RELA, and SHF_INFO_LINK flag. */
1217 1018 : if (SH_INFO_LINK_P (&shdr_info[cnt].shdr))
1218 146 : shdr_info[cnt].shdr.sh_info =
1219 146 : shdr_info[shdr_info[cnt].shdr.sh_info].idx;
1220 :
1221 : /* Get the data from the old file if necessary. We already
1222 : created the data for the section header string table. */
1223 1018 : if (cnt < shnum)
1224 : {
1225 940 : if (shdr_info[cnt].data == NULL)
1226 : {
1227 386 : shdr_info[cnt].data = elf_getdata (shdr_info[cnt].scn, NULL);
1228 386 : if (shdr_info[cnt].data == NULL)
1229 0 : INTERNAL_ERROR (fname);
1230 : }
1231 :
1232 : /* Set the data. This is done by copying from the old file. */
1233 940 : newdata = elf_newdata (scn);
1234 940 : if (newdata == NULL)
1235 0 : INTERNAL_ERROR (fname);
1236 :
1237 : /* Copy the structure. */
1238 940 : *newdata = *shdr_info[cnt].data;
1239 :
1240 : /* We know the size. */
1241 940 : shdr_info[cnt].shdr.sh_size = shdr_info[cnt].data->d_size;
1242 :
1243 : /* We have to adjust symbol tables. The st_shndx member might
1244 : have to be updated. */
1245 1880 : if (shdr_info[cnt].shdr.sh_type == SHT_DYNSYM
1246 940 : || shdr_info[cnt].shdr.sh_type == SHT_SYMTAB)
1247 : {
1248 48 : Elf_Data *versiondata = NULL;
1249 48 : Elf_Data *shndxdata = NULL;
1250 :
1251 48 : size_t elsize = gelf_fsize (elf, ELF_T_SYM, 1, EV_CURRENT);
1252 :
1253 48 : if (shdr_info[cnt].symtab_idx != 0)
1254 : {
1255 0 : elf_assert (shdr_info[cnt].shdr.sh_type == SHT_SYMTAB_SHNDX);
1256 : /* This section has extended section information.
1257 : We have to modify that information, too. */
1258 0 : shndxdata = elf_getdata (shdr_info[shdr_info[cnt].symtab_idx].scn,
1259 : NULL);
1260 :
1261 0 : elf_assert (shndxdata != NULL
1262 : && shndxdata->d_buf != NULL
1263 : && ((shndxdata->d_size / sizeof (Elf32_Word))
1264 : >= shdr_info[cnt].data->d_size / elsize));
1265 : }
1266 :
1267 48 : if (shdr_info[cnt].version_idx != 0)
1268 : {
1269 22 : elf_assert (shdr_info[cnt].shdr.sh_type == SHT_DYNSYM);
1270 : /* This section has associated version
1271 : information. We have to modify that
1272 : information, too. */
1273 22 : versiondata = elf_getdata (shdr_info[shdr_info[cnt].version_idx].scn,
1274 : NULL);
1275 :
1276 22 : elf_assert (versiondata != NULL
1277 : && versiondata->d_buf != NULL
1278 : && ((versiondata->d_size / sizeof (GElf_Versym))
1279 : >= shdr_info[cnt].data->d_size / elsize));
1280 : }
1281 :
1282 48 : shdr_info[cnt].newsymidx
1283 48 : = (Elf32_Word *) xcalloc (shdr_info[cnt].data->d_size
1284 : / elsize, sizeof (Elf32_Word));
1285 :
1286 48 : bool last_was_local = true;
1287 : size_t destidx;
1288 : size_t inner;
1289 12789 : for (destidx = inner = 1;
1290 12741 : inner < shdr_info[cnt].data->d_size / elsize;
1291 12693 : ++inner)
1292 : {
1293 : Elf32_Word sec;
1294 : GElf_Sym sym_mem;
1295 : Elf32_Word xshndx;
1296 12693 : GElf_Sym *sym = gelf_getsymshndx (shdr_info[cnt].data,
1297 : shndxdata, inner,
1298 : &sym_mem, &xshndx);
1299 12693 : if (sym == NULL)
1300 0 : INTERNAL_ERROR (fname);
1301 :
1302 12693 : if (sym->st_shndx == SHN_UNDEF
1303 11492 : || (sym->st_shndx >= shnum
1304 79 : && sym->st_shndx != SHN_XINDEX))
1305 : {
1306 : /* This is no section index, leave it alone
1307 : unless it is moved. */
1308 1280 : if (destidx != inner
1309 943 : && gelf_update_symshndx (shdr_info[cnt].data,
1310 : shndxdata,
1311 : destidx, sym,
1312 : xshndx) == 0)
1313 0 : INTERNAL_ERROR (fname);
1314 :
1315 1280 : shdr_info[cnt].newsymidx[inner] = destidx++;
1316 :
1317 1280 : if (last_was_local
1318 81 : && GELF_ST_BIND (sym->st_info) != STB_LOCAL)
1319 : {
1320 27 : last_was_local = false;
1321 27 : shdr_info[cnt].shdr.sh_info = destidx - 1;
1322 : }
1323 :
1324 1280 : continue;
1325 : }
1326 :
1327 : /* Get the full section index, if necessary from the
1328 : XINDEX table. */
1329 11413 : if (sym->st_shndx == SHN_XINDEX)
1330 0 : elf_assert (shndxdata != NULL
1331 : && shndxdata->d_buf != NULL);
1332 11413 : size_t sidx = (sym->st_shndx != SHN_XINDEX
1333 11413 : ? sym->st_shndx : xshndx);
1334 11413 : sec = shdr_info[sidx].idx;
1335 :
1336 11413 : if (sec != 0)
1337 : {
1338 : GElf_Section nshndx;
1339 : Elf32_Word nxshndx;
1340 :
1341 907 : if (sec < SHN_LORESERVE)
1342 : {
1343 907 : nshndx = sec;
1344 907 : nxshndx = 0;
1345 : }
1346 : else
1347 : {
1348 : nshndx = SHN_XINDEX;
1349 : nxshndx = sec;
1350 : }
1351 :
1352 907 : elf_assert (sec < SHN_LORESERVE || shndxdata != NULL);
1353 :
1354 907 : if ((inner != destidx || nshndx != sym->st_shndx
1355 666 : || (shndxdata != NULL && nxshndx != xshndx))
1356 482 : && (sym->st_shndx = nshndx,
1357 241 : gelf_update_symshndx (shdr_info[cnt].data,
1358 : shndxdata,
1359 : destidx, sym,
1360 : nxshndx) == 0))
1361 0 : INTERNAL_ERROR (fname);
1362 :
1363 907 : shdr_info[cnt].newsymidx[inner] = destidx++;
1364 :
1365 907 : if (last_was_local
1366 756 : && GELF_ST_BIND (sym->st_info) != STB_LOCAL)
1367 : {
1368 21 : last_was_local = false;
1369 21 : shdr_info[cnt].shdr.sh_info = destidx - 1;
1370 : }
1371 : }
1372 10506 : else if ((shdr_info[cnt].shdr.sh_flags & SHF_ALLOC) != 0
1373 32 : && GELF_ST_TYPE (sym->st_info) != STT_SECTION
1374 0 : && shdr_info[sidx].shdr.sh_type != SHT_GROUP)
1375 : {
1376 : /* Removing a real symbol from an allocated
1377 : symbol table is hard and probably a
1378 : mistake. Really removing it means
1379 : rewriting the dynamic segment and hash
1380 : sections. Just warn and set the symbol
1381 : section to UNDEF. */
1382 0 : error (0, 0,
1383 0 : gettext ("Cannot remove symbol [%zd] from allocated symbol table [%zd]"), inner, cnt);
1384 0 : sym->st_shndx = SHN_UNDEF;
1385 0 : if (gelf_update_sym (shdr_info[cnt].data, destidx,
1386 : sym) == 0)
1387 0 : INTERNAL_ERROR (fname);
1388 0 : shdr_info[cnt].newsymidx[inner] = destidx++;
1389 : }
1390 10506 : else if (debug_fname != NULL
1391 10446 : && shdr_info[cnt].debug_data == NULL)
1392 : /* The symbol points to a section that is discarded
1393 : but isn't preserved in the debug file. Check that
1394 : this is a section or group signature symbol
1395 : for a section which has been removed. */
1396 : {
1397 8 : elf_assert (GELF_ST_TYPE (sym->st_info) == STT_SECTION
1398 : || ((shdr_info[sidx].shdr.sh_type
1399 : == SHT_GROUP)
1400 : && (shdr_info[sidx].shdr.sh_info
1401 : == inner)));
1402 : }
1403 : }
1404 :
1405 48 : if (destidx != inner)
1406 : {
1407 : /* The size of the symbol table changed. */
1408 30 : shdr_info[cnt].shdr.sh_size = newdata->d_size
1409 30 : = destidx * elsize;
1410 30 : any_symtab_changes = true;
1411 : }
1412 : else
1413 : {
1414 : /* The symbol table didn't really change. */
1415 18 : free (shdr_info[cnt].newsymidx);
1416 18 : shdr_info[cnt].newsymidx = NULL;
1417 : }
1418 : }
1419 : }
1420 :
1421 : /* If we have to, compute the offset of the section. */
1422 1018 : if (shdr_info[cnt].shdr.sh_offset == 0)
1423 : shdr_info[cnt].shdr.sh_offset
1424 1002 : = ((lastoffset + shdr_info[cnt].shdr.sh_addralign - 1)
1425 501 : & ~((GElf_Off) (shdr_info[cnt].shdr.sh_addralign - 1)));
1426 :
1427 : /* Set the section header in the new file. */
1428 1018 : if (unlikely (gelf_update_shdr (scn, &shdr_info[cnt].shdr) == 0))
1429 : /* There cannot be any overflows. */
1430 0 : INTERNAL_ERROR (fname);
1431 :
1432 : /* Remember the last section written so far. */
1433 2036 : GElf_Off filesz = (shdr_info[cnt].shdr.sh_type != SHT_NOBITS
1434 1018 : ? shdr_info[cnt].shdr.sh_size : 0);
1435 1018 : if (lastoffset < shdr_info[cnt].shdr.sh_offset + filesz)
1436 967 : lastoffset = shdr_info[cnt].shdr.sh_offset + filesz;
1437 : }
1438 :
1439 : /* Adjust symbol references if symbol tables changed. */
1440 48 : if (any_symtab_changes)
1441 : /* Find all relocation sections which use this symbol table. */
1442 978 : for (cnt = 1; cnt <= shdridx; ++cnt)
1443 : {
1444 : /* Update section headers when the data size has changed.
1445 : We also update the SHT_NOBITS section in the debug
1446 : file so that the section headers match in sh_size. */
1447 8 : inline void update_section_size (const Elf_Data *newdata)
1448 : {
1449 : GElf_Shdr shdr_mem;
1450 8 : GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
1451 8 : shdr->sh_size = newdata->d_size;
1452 8 : (void) gelf_update_shdr (scn, shdr);
1453 8 : if (debugelf != NULL)
1454 : {
1455 : /* libelf will use d_size to set sh_size. */
1456 2 : Elf_Data *debugdata = elf_getdata (elf_getscn (debugelf,
1457 : cnt), NULL);
1458 2 : if (debugdata == NULL)
1459 0 : INTERNAL_ERROR (fname);
1460 2 : debugdata->d_size = newdata->d_size;
1461 : }
1462 8 : }
1463 :
1464 948 : if (shdr_info[cnt].idx == 0 && debug_fname == NULL)
1465 : /* Ignore sections which are discarded. When we are saving a
1466 : relocation section in a separate debug file, we must fix up
1467 : the symbol table references. */
1468 89 : continue;
1469 :
1470 859 : const Elf32_Word symtabidx = shdr_info[cnt].old_sh_link;
1471 859 : elf_assert (symtabidx < shnum + 2);
1472 859 : const Elf32_Word *const newsymidx = shdr_info[symtabidx].newsymidx;
1473 859 : switch (shdr_info[cnt].shdr.sh_type)
1474 : {
1475 : inline bool no_symtab_updates (void)
1476 : {
1477 : /* If the symbol table hasn't changed, do not do anything. */
1478 233 : if (shdr_info[symtabidx].newsymidx == NULL)
1479 : return true;
1480 :
1481 : /* If the symbol table is not discarded, but additionally
1482 : duplicated in the separate debug file and this section
1483 : is discarded, don't adjust anything. */
1484 : return (shdr_info[cnt].idx == 0
1485 233 : && shdr_info[symtabidx].debug_data != NULL);
1486 : }
1487 :
1488 : case SHT_REL:
1489 : case SHT_RELA:
1490 222 : if (no_symtab_updates ())
1491 : break;
1492 :
1493 224 : Elf_Data *d = elf_getdata (shdr_info[cnt].idx == 0
1494 : ? elf_getscn (debugelf, cnt)
1495 112 : : elf_getscn (newelf,
1496 : shdr_info[cnt].idx),
1497 : NULL);
1498 112 : elf_assert (d != NULL && d->d_buf != NULL
1499 : && shdr_info[cnt].shdr.sh_entsize != 0);
1500 112 : size_t nrels = (shdr_info[cnt].shdr.sh_size
1501 : / shdr_info[cnt].shdr.sh_entsize);
1502 :
1503 112 : size_t symsize = gelf_fsize (elf, ELF_T_SYM, 1, EV_CURRENT);
1504 224 : const Elf32_Word symidxn = (shdr_info[symtabidx].data->d_size
1505 112 : / symsize);
1506 112 : if (shdr_info[cnt].shdr.sh_type == SHT_REL)
1507 1608 : for (size_t relidx = 0; relidx < nrels; ++relidx)
1508 : {
1509 : GElf_Rel rel_mem;
1510 1608 : if (gelf_getrel (d, relidx, &rel_mem) == NULL)
1511 0 : INTERNAL_ERROR (fname);
1512 :
1513 1608 : size_t symidx = GELF_R_SYM (rel_mem.r_info);
1514 1608 : elf_assert (symidx < symidxn);
1515 1608 : if (newsymidx[symidx] != symidx)
1516 : {
1517 : rel_mem.r_info
1518 1472 : = GELF_R_INFO (newsymidx[symidx],
1519 : GELF_R_TYPE (rel_mem.r_info));
1520 :
1521 1472 : if (gelf_update_rel (d, relidx, &rel_mem) == 0)
1522 0 : INTERNAL_ERROR (fname);
1523 : }
1524 : }
1525 : else
1526 10179 : for (size_t relidx = 0; relidx < nrels; ++relidx)
1527 : {
1528 : GElf_Rela rel_mem;
1529 10179 : if (gelf_getrela (d, relidx, &rel_mem) == NULL)
1530 0 : INTERNAL_ERROR (fname);
1531 :
1532 10179 : size_t symidx = GELF_R_SYM (rel_mem.r_info);
1533 10179 : elf_assert (symidx < symidxn);
1534 10179 : if (newsymidx[symidx] != symidx)
1535 : {
1536 : rel_mem.r_info
1537 2449 : = GELF_R_INFO (newsymidx[symidx],
1538 : GELF_R_TYPE (rel_mem.r_info));
1539 :
1540 2449 : if (gelf_update_rela (d, relidx, &rel_mem) == 0)
1541 0 : INTERNAL_ERROR (fname);
1542 : }
1543 : }
1544 : break;
1545 :
1546 : case SHT_HASH:
1547 4 : if (no_symtab_updates ())
1548 : break;
1549 :
1550 : /* We have to recompute the hash table. */
1551 :
1552 4 : elf_assert (shdr_info[cnt].idx > 0);
1553 :
1554 : /* The hash section in the new file. */
1555 4 : scn = elf_getscn (newelf, shdr_info[cnt].idx);
1556 :
1557 : /* The symbol table data. */
1558 4 : Elf_Data *symd = elf_getdata (elf_getscn (newelf,
1559 4 : shdr_info[symtabidx].idx),
1560 : NULL);
1561 4 : elf_assert (symd != NULL && symd->d_buf != NULL);
1562 :
1563 : /* The hash table data. */
1564 4 : Elf_Data *hashd = elf_getdata (scn, NULL);
1565 4 : elf_assert (hashd != NULL && hashd->d_buf != NULL);
1566 :
1567 4 : if (shdr_info[cnt].shdr.sh_entsize == sizeof (Elf32_Word))
1568 : {
1569 : /* Sane arches first. */
1570 4 : elf_assert (hashd->d_size >= 2 * sizeof (Elf32_Word));
1571 4 : Elf32_Word *bucket = (Elf32_Word *) hashd->d_buf;
1572 :
1573 4 : size_t strshndx = shdr_info[symtabidx].old_sh_link;
1574 4 : size_t elsize = gelf_fsize (elf, ELF_T_SYM, 1, EV_CURRENT);
1575 :
1576 4 : Elf32_Word nchain = bucket[1];
1577 4 : Elf32_Word nbucket = bucket[0];
1578 8 : uint64_t used_buf = ((2ULL + nchain + nbucket)
1579 4 : * sizeof (Elf32_Word));
1580 4 : elf_assert (used_buf <= hashd->d_size);
1581 :
1582 : /* Adjust the nchain value. The symbol table size
1583 : changed. We keep the same size for the bucket array. */
1584 4 : bucket[1] = symd->d_size / elsize;
1585 4 : bucket += 2;
1586 4 : Elf32_Word *chain = bucket + nbucket;
1587 :
1588 : /* New size of the section. */
1589 8 : size_t n_size = ((2 + symd->d_size / elsize + nbucket)
1590 4 : * sizeof (Elf32_Word));
1591 4 : elf_assert (n_size <= hashd->d_size);
1592 4 : hashd->d_size = n_size;
1593 4 : update_section_size (hashd);
1594 :
1595 : /* Clear the arrays. */
1596 4 : memset (bucket, '\0',
1597 4 : (symd->d_size / elsize + nbucket)
1598 : * sizeof (Elf32_Word));
1599 :
1600 56 : for (size_t inner = shdr_info[symtabidx].shdr.sh_info;
1601 48 : inner < symd->d_size / elsize; ++inner)
1602 : {
1603 : GElf_Sym sym_mem;
1604 48 : GElf_Sym *sym = gelf_getsym (symd, inner, &sym_mem);
1605 48 : elf_assert (sym != NULL);
1606 :
1607 48 : const char *name = elf_strptr (elf, strshndx,
1608 48 : sym->st_name);
1609 48 : elf_assert (name != NULL && nbucket != 0);
1610 48 : size_t hidx = elf_hash (name) % nbucket;
1611 :
1612 48 : if (bucket[hidx] == 0)
1613 40 : bucket[hidx] = inner;
1614 : else
1615 : {
1616 8 : hidx = bucket[hidx];
1617 :
1618 16 : while (chain[hidx] != 0 && chain[hidx] < nchain)
1619 0 : hidx = chain[hidx];
1620 :
1621 8 : chain[hidx] = inner;
1622 : }
1623 : }
1624 : }
1625 : else
1626 : {
1627 : /* Alpha and S390 64-bit use 64-bit SHT_HASH entries. */
1628 0 : elf_assert (shdr_info[cnt].shdr.sh_entsize
1629 : == sizeof (Elf64_Xword));
1630 :
1631 0 : Elf64_Xword *bucket = (Elf64_Xword *) hashd->d_buf;
1632 :
1633 0 : size_t strshndx = shdr_info[symtabidx].old_sh_link;
1634 0 : size_t elsize = gelf_fsize (elf, ELF_T_SYM, 1, EV_CURRENT);
1635 :
1636 0 : elf_assert (symd->d_size >= 2 * sizeof (Elf64_Xword));
1637 0 : Elf64_Xword nbucket = bucket[0];
1638 0 : Elf64_Xword nchain = bucket[1];
1639 0 : uint64_t maxwords = hashd->d_size / sizeof (Elf64_Xword);
1640 0 : elf_assert (maxwords >= 2
1641 : && maxwords - 2 >= nbucket
1642 : && maxwords - 2 - nbucket >= nchain);
1643 :
1644 : /* Adjust the nchain value. The symbol table size
1645 : changed. We keep the same size for the bucket array. */
1646 0 : bucket[1] = symd->d_size / elsize;
1647 0 : bucket += 2;
1648 0 : Elf64_Xword *chain = bucket + nbucket;
1649 :
1650 : /* New size of the section. */
1651 0 : size_t n_size = ((2 + symd->d_size / elsize + nbucket)
1652 0 : * sizeof (Elf64_Xword));
1653 0 : elf_assert (n_size <= hashd->d_size);
1654 0 : hashd->d_size = n_size;
1655 0 : update_section_size (hashd);
1656 :
1657 : /* Clear the arrays. */
1658 0 : memset (bucket, '\0',
1659 0 : (symd->d_size / elsize + nbucket)
1660 : * sizeof (Elf64_Xword));
1661 :
1662 0 : for (size_t inner = shdr_info[symtabidx].shdr.sh_info;
1663 0 : inner < symd->d_size / elsize; ++inner)
1664 : {
1665 : GElf_Sym sym_mem;
1666 0 : GElf_Sym *sym = gelf_getsym (symd, inner, &sym_mem);
1667 0 : elf_assert (sym != NULL);
1668 :
1669 0 : const char *name = elf_strptr (elf, strshndx,
1670 0 : sym->st_name);
1671 0 : elf_assert (name != NULL && nbucket != 0);
1672 0 : size_t hidx = elf_hash (name) % nbucket;
1673 :
1674 0 : if (bucket[hidx] == 0)
1675 0 : bucket[hidx] = inner;
1676 : else
1677 : {
1678 : hidx = bucket[hidx];
1679 :
1680 0 : while (chain[hidx] != 0 && chain[hidx] < nchain)
1681 : hidx = chain[hidx];
1682 :
1683 0 : chain[hidx] = inner;
1684 : }
1685 : }
1686 : }
1687 : break;
1688 :
1689 : case SHT_GNU_versym:
1690 : /* If the symbol table changed we have to adjust the entries. */
1691 4 : if (no_symtab_updates ())
1692 : break;
1693 :
1694 4 : elf_assert (shdr_info[cnt].idx > 0);
1695 :
1696 : /* The symbol version section in the new file. */
1697 4 : scn = elf_getscn (newelf, shdr_info[cnt].idx);
1698 :
1699 : /* The symbol table data. */
1700 4 : symd = elf_getdata (elf_getscn (newelf, shdr_info[symtabidx].idx),
1701 : NULL);
1702 4 : elf_assert (symd != NULL && symd->d_buf != NULL);
1703 4 : size_t symz = gelf_fsize (elf, ELF_T_SYM, 1, EV_CURRENT);
1704 4 : const Elf32_Word syms = (shdr_info[symtabidx].data->d_size / symz);
1705 :
1706 : /* The version symbol data. */
1707 4 : Elf_Data *verd = elf_getdata (scn, NULL);
1708 4 : elf_assert (verd != NULL && verd->d_buf != NULL);
1709 :
1710 : /* The symbol version array. */
1711 4 : GElf_Half *verstab = (GElf_Half *) verd->d_buf;
1712 :
1713 : /* Walk through the list and */
1714 4 : size_t elsize = gelf_fsize (elf, verd->d_type, 1, EV_CURRENT);
1715 4 : Elf32_Word vers = verd->d_size / elsize;
1716 172 : for (size_t inner = 1; inner < vers && inner < syms; ++inner)
1717 168 : if (newsymidx[inner] != 0 && newsymidx[inner] < vers)
1718 : /* Overwriting the same array works since the
1719 : reordering can only move entries to lower indices
1720 : in the array. */
1721 136 : verstab[newsymidx[inner]] = verstab[inner];
1722 :
1723 : /* New size of the section. */
1724 4 : verd->d_size = gelf_fsize (newelf, verd->d_type,
1725 4 : symd->d_size
1726 4 : / gelf_fsize (elf, symd->d_type, 1,
1727 : EV_CURRENT),
1728 : EV_CURRENT);
1729 4 : update_section_size (verd);
1730 4 : break;
1731 :
1732 : case SHT_GROUP:
1733 3 : if (no_symtab_updates ())
1734 : break;
1735 :
1736 : /* Yes, the symbol table changed.
1737 : Update the section header of the section group. */
1738 2 : scn = elf_getscn (newelf, shdr_info[cnt].idx);
1739 : GElf_Shdr shdr_mem;
1740 2 : GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
1741 2 : elf_assert (shdr != NULL);
1742 :
1743 2 : size_t symsz = gelf_fsize (elf, ELF_T_SYM, 1, EV_CURRENT);
1744 4 : const Elf32_Word symn = (shdr_info[symtabidx].data->d_size
1745 2 : / symsz);
1746 2 : elf_assert (shdr->sh_info < symn);
1747 2 : shdr->sh_info = newsymidx[shdr->sh_info];
1748 :
1749 2 : (void) gelf_update_shdr (scn, shdr);
1750 2 : break;
1751 : }
1752 : }
1753 :
1754 : /* Remove any relocations between debug sections in ET_REL
1755 : for the debug file when requested. These relocations are always
1756 : zero based between the unallocated sections. */
1757 48 : if (debug_fname != NULL && reloc_debug && ehdr->e_type == ET_REL)
1758 : {
1759 9 : scn = NULL;
1760 9 : cnt = 0;
1761 294 : while ((scn = elf_nextscn (debugelf, scn)) != NULL)
1762 : {
1763 276 : cnt++;
1764 : /* We need the actual section and header from the debugelf
1765 : not just the cached original in shdr_info because we
1766 : might want to change the size. */
1767 : GElf_Shdr shdr_mem;
1768 276 : GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
1769 276 : if (shdr->sh_type == SHT_REL || shdr->sh_type == SHT_RELA)
1770 : {
1771 : /* Make sure that this relocation section points to a
1772 : section to relocate with contents, that isn't
1773 : allocated and that is a debug section. */
1774 44 : Elf_Scn *tscn = elf_getscn (debugelf, shdr->sh_info);
1775 : GElf_Shdr tshdr_mem;
1776 44 : GElf_Shdr *tshdr = gelf_getshdr (tscn, &tshdr_mem);
1777 44 : if (tshdr->sh_type == SHT_NOBITS
1778 44 : || tshdr->sh_size == 0
1779 44 : || (tshdr->sh_flags & SHF_ALLOC) != 0)
1780 0 : continue;
1781 :
1782 44 : const char *tname = elf_strptr (debugelf, shstrndx,
1783 44 : tshdr->sh_name);
1784 44 : if (! tname || ! ebl_debugscn_p (ebl, tname))
1785 0 : continue;
1786 :
1787 : /* OK, lets relocate all trivial cross debug section
1788 : relocations. */
1789 44 : Elf_Data *reldata = elf_getdata (scn, NULL);
1790 44 : if (reldata == NULL || reldata->d_buf == NULL)
1791 0 : INTERNAL_ERROR (fname);
1792 :
1793 : /* Make sure we adjust the uncompressed debug data
1794 : (and recompress if necessary at the end). */
1795 : GElf_Chdr tchdr;
1796 44 : int tcompress_type = 0;
1797 44 : if (gelf_getchdr (tscn, &tchdr) != NULL)
1798 : {
1799 5 : tcompress_type = tchdr.ch_type;
1800 5 : if (elf_compress (tscn, 0, 0) != 1)
1801 0 : INTERNAL_ERROR (fname);
1802 : }
1803 :
1804 44 : Elf_Data *tdata = elf_getdata (tscn, NULL);
1805 44 : if (tdata == NULL || tdata->d_buf == NULL
1806 44 : || tdata->d_type != ELF_T_BYTE)
1807 0 : INTERNAL_ERROR (fname);
1808 :
1809 : /* Pick up the symbol table and shndx table to
1810 : resolve relocation symbol indexes. */
1811 44 : Elf64_Word symt = shdr->sh_link;
1812 : Elf_Data *symdata, *xndxdata;
1813 44 : elf_assert (symt < shnum + 2);
1814 44 : elf_assert (shdr_info[symt].symtab_idx < shnum + 2);
1815 88 : symdata = (shdr_info[symt].debug_data
1816 44 : ?: shdr_info[symt].data);
1817 88 : xndxdata = (shdr_info[shdr_info[symt].symtab_idx].debug_data
1818 44 : ?: shdr_info[shdr_info[symt].symtab_idx].data);
1819 :
1820 : /* Apply one relocation. Returns true when trivial
1821 : relocation actually done. */
1822 30548 : bool relocate (GElf_Addr offset, const GElf_Sxword addend,
1823 : bool is_rela, int rtype, int symndx)
1824 : {
1825 : /* R_*_NONE relocs can always just be removed. */
1826 30548 : if (rtype == 0)
1827 : return true;
1828 :
1829 : /* We only do simple absolute relocations. */
1830 30548 : Elf_Type type = ebl_reloc_simple_type (ebl, rtype);
1831 30548 : if (type == ELF_T_NUM)
1832 : return false;
1833 :
1834 : /* These are the types we can relocate. */
1835 : #define TYPES DO_TYPE (BYTE, Byte); DO_TYPE (HALF, Half); \
1836 : DO_TYPE (WORD, Word); DO_TYPE (SWORD, Sword); \
1837 : DO_TYPE (XWORD, Xword); DO_TYPE (SXWORD, Sxword)
1838 :
1839 : /* And only for relocations against other debug sections. */
1840 : GElf_Sym sym_mem;
1841 : Elf32_Word xndx;
1842 30548 : GElf_Sym *sym = gelf_getsymshndx (symdata, xndxdata,
1843 : symndx, &sym_mem,
1844 : &xndx);
1845 61096 : Elf32_Word sec = (sym->st_shndx == SHN_XINDEX
1846 30548 : ? xndx : sym->st_shndx);
1847 30548 : if (sec >= shnum + 2)
1848 0 : INTERNAL_ERROR (fname);
1849 :
1850 30548 : if (ebl_debugscn_p (ebl, shdr_info[sec].name))
1851 : {
1852 : size_t size;
1853 :
1854 : #define DO_TYPE(NAME, Name) GElf_##Name Name;
1855 : union { TYPES; } tmpbuf;
1856 : #undef DO_TYPE
1857 :
1858 21657 : switch (type)
1859 : {
1860 : #define DO_TYPE(NAME, Name) \
1861 : case ELF_T_##NAME: \
1862 : size = sizeof (GElf_##Name); \
1863 : tmpbuf.Name = 0; \
1864 : break;
1865 0 : TYPES;
1866 : #undef DO_TYPE
1867 : default:
1868 : return false;
1869 : }
1870 :
1871 21657 : if (offset > tdata->d_size
1872 21657 : || tdata->d_size - offset < size)
1873 : {
1874 0 : cleanup_debug ();
1875 0 : error (EXIT_FAILURE, 0, gettext ("bad relocation"));
1876 : }
1877 :
1878 : /* When the symbol value is zero then for SHT_REL
1879 : sections this is all that needs to be checked.
1880 : The addend is contained in the original data at
1881 : the offset already. So if the (section) symbol
1882 : address is zero and the given addend is zero
1883 : just remove the relocation, it isn't needed
1884 : anymore. */
1885 21657 : if (addend == 0 && sym->st_value == 0)
1886 : return true;
1887 :
1888 18415 : Elf_Data tmpdata =
1889 : {
1890 : .d_type = type,
1891 : .d_buf = &tmpbuf,
1892 : .d_size = size,
1893 : .d_version = EV_CURRENT,
1894 : };
1895 36830 : Elf_Data rdata =
1896 : {
1897 : .d_type = type,
1898 18415 : .d_buf = tdata->d_buf + offset,
1899 : .d_size = size,
1900 : .d_version = EV_CURRENT,
1901 : };
1902 :
1903 18415 : GElf_Addr value = sym->st_value;
1904 18415 : if (is_rela)
1905 : {
1906 : /* For SHT_RELA sections we just take the
1907 : given addend and add it to the value. */
1908 18415 : value += addend;
1909 : }
1910 : else
1911 : {
1912 : /* For SHT_REL sections we have to peek at
1913 : what is already in the section at the given
1914 : offset to get the addend. */
1915 0 : Elf_Data *d = gelf_xlatetom (debugelf, &tmpdata,
1916 : &rdata,
1917 0 : ehdr->e_ident[EI_DATA]);
1918 0 : if (d == NULL)
1919 0 : INTERNAL_ERROR (fname);
1920 0 : assert (d == &tmpdata);
1921 : }
1922 :
1923 18415 : switch (type)
1924 : {
1925 : #define DO_TYPE(NAME, Name) \
1926 : case ELF_T_##NAME: \
1927 : tmpbuf.Name += (GElf_##Name) value; \
1928 : break;
1929 0 : TYPES;
1930 : #undef DO_TYPE
1931 : default:
1932 0 : abort ();
1933 : }
1934 :
1935 : /* Now finally put in the new value. */
1936 18415 : Elf_Data *s = gelf_xlatetof (debugelf, &rdata,
1937 : &tmpdata,
1938 18415 : ehdr->e_ident[EI_DATA]);
1939 18415 : if (s == NULL)
1940 0 : INTERNAL_ERROR (fname);
1941 18415 : assert (s == &rdata);
1942 :
1943 : return true;
1944 : }
1945 : return false;
1946 : }
1947 :
1948 44 : if (shdr->sh_entsize == 0)
1949 0 : INTERNAL_ERROR (fname);
1950 :
1951 44 : size_t nrels = shdr->sh_size / shdr->sh_entsize;
1952 44 : size_t next = 0;
1953 44 : if (shdr->sh_type == SHT_REL)
1954 3212 : for (size_t relidx = 0; relidx < nrels; ++relidx)
1955 : {
1956 : GElf_Rel rel_mem;
1957 3212 : GElf_Rel *r = gelf_getrel (reldata, relidx, &rel_mem);
1958 3212 : if (! relocate (r->r_offset, 0, false,
1959 : GELF_R_TYPE (r->r_info),
1960 3212 : GELF_R_SYM (r->r_info)))
1961 : {
1962 18 : if (relidx != next)
1963 16 : gelf_update_rel (reldata, next, r);
1964 18 : ++next;
1965 : }
1966 : }
1967 : else
1968 27336 : for (size_t relidx = 0; relidx < nrels; ++relidx)
1969 : {
1970 : GElf_Rela rela_mem;
1971 27336 : GElf_Rela *r = gelf_getrela (reldata, relidx, &rela_mem);
1972 27336 : if (! relocate (r->r_offset, r->r_addend, true,
1973 : GELF_R_TYPE (r->r_info),
1974 27336 : GELF_R_SYM (r->r_info)))
1975 : {
1976 8873 : if (relidx != next)
1977 2051 : gelf_update_rela (reldata, next, r);
1978 8873 : ++next;
1979 : }
1980 : }
1981 :
1982 44 : nrels = next;
1983 44 : shdr->sh_size = reldata->d_size = nrels * shdr->sh_entsize;
1984 44 : gelf_update_shdr (scn, shdr);
1985 :
1986 44 : if (tcompress_type != 0)
1987 5 : if (elf_compress (tscn, tcompress_type, ELF_CHF_FORCE) != 1)
1988 0 : INTERNAL_ERROR (fname);
1989 : }
1990 : }
1991 : }
1992 :
1993 : /* Now that we have done all adjustments to the data,
1994 : we can actually write out the debug file. */
1995 48 : if (debug_fname != NULL)
1996 : {
1997 : /* Finally write the file. */
1998 30 : if (unlikely (elf_update (debugelf, ELF_C_WRITE) == -1))
1999 : {
2000 0 : error (0, 0, gettext ("while writing '%s': %s"),
2001 : tmp_debug_fname, elf_errmsg (-1));
2002 0 : result = 1;
2003 0 : goto fail_close;
2004 : }
2005 :
2006 : /* Create the real output file. First rename, then change the
2007 : mode. */
2008 30 : if (rename (tmp_debug_fname, debug_fname) != 0
2009 30 : || fchmod (debug_fd, mode) != 0)
2010 : {
2011 0 : error (0, errno, gettext ("while creating '%s'"), debug_fname);
2012 0 : result = 1;
2013 0 : goto fail_close;
2014 : }
2015 :
2016 : /* The temporary file does not exist anymore. */
2017 30 : free (tmp_debug_fname);
2018 30 : tmp_debug_fname = NULL;
2019 :
2020 30 : if (!remove_shdrs)
2021 : {
2022 : uint32_t debug_crc;
2023 30 : Elf_Data debug_crc_data =
2024 : {
2025 : .d_type = ELF_T_WORD,
2026 : .d_buf = &debug_crc,
2027 : .d_size = sizeof (debug_crc),
2028 : .d_version = EV_CURRENT
2029 : };
2030 :
2031 : /* Compute the checksum which we will add to the executable. */
2032 30 : if (crc32_file (debug_fd, &debug_crc) != 0)
2033 : {
2034 0 : error (0, errno, gettext ("\
2035 : while computing checksum for debug information"));
2036 0 : unlink (debug_fname);
2037 0 : result = 1;
2038 0 : goto fail_close;
2039 : }
2040 :
2041 : /* Store it in the debuglink section data. */
2042 30 : if (unlikely (gelf_xlatetof (newelf, &debuglink_crc_data,
2043 : &debug_crc_data, ehdr->e_ident[EI_DATA])
2044 : != &debuglink_crc_data))
2045 0 : INTERNAL_ERROR (fname);
2046 : }
2047 : }
2048 :
2049 : /* Finally finish the ELF header. Fill in the fields not handled by
2050 : libelf from the old file. */
2051 48 : newehdr = gelf_getehdr (newelf, &newehdr_mem);
2052 48 : if (newehdr == NULL)
2053 0 : INTERNAL_ERROR (fname);
2054 :
2055 48 : memcpy (newehdr->e_ident, ehdr->e_ident, EI_NIDENT);
2056 48 : newehdr->e_type = ehdr->e_type;
2057 48 : newehdr->e_machine = ehdr->e_machine;
2058 48 : newehdr->e_version = ehdr->e_version;
2059 48 : newehdr->e_entry = ehdr->e_entry;
2060 48 : newehdr->e_flags = ehdr->e_flags;
2061 48 : newehdr->e_phoff = ehdr->e_phoff;
2062 :
2063 : /* We need to position the section header table. */
2064 48 : const size_t offsize = gelf_fsize (elf, ELF_T_OFF, 1, EV_CURRENT);
2065 96 : newehdr->e_shoff = ((shdr_info[shdridx].shdr.sh_offset
2066 48 : + shdr_info[shdridx].shdr.sh_size + offsize - 1)
2067 48 : & ~((GElf_Off) (offsize - 1)));
2068 48 : newehdr->e_shentsize = gelf_fsize (elf, ELF_T_SHDR, 1, EV_CURRENT);
2069 :
2070 : /* The new section header string table index. */
2071 48 : if (likely (idx < SHN_HIRESERVE) && likely (idx != SHN_XINDEX))
2072 48 : newehdr->e_shstrndx = idx;
2073 : else
2074 : {
2075 : /* The index does not fit in the ELF header field. */
2076 0 : shdr_info[0].scn = elf_getscn (elf, 0);
2077 :
2078 0 : if (gelf_getshdr (shdr_info[0].scn, &shdr_info[0].shdr) == NULL)
2079 0 : INTERNAL_ERROR (fname);
2080 :
2081 0 : shdr_info[0].shdr.sh_link = idx;
2082 0 : (void) gelf_update_shdr (shdr_info[0].scn, &shdr_info[0].shdr);
2083 :
2084 0 : newehdr->e_shstrndx = SHN_XINDEX;
2085 : }
2086 :
2087 48 : if (gelf_update_ehdr (newelf, newehdr) == 0)
2088 : {
2089 0 : error (0, 0, gettext ("%s: error while creating ELF header: %s"),
2090 0 : output_fname ?: fname, elf_errmsg (-1));
2091 0 : cleanup_debug ();
2092 0 : return 1;
2093 : }
2094 :
2095 : /* We have everything from the old file. */
2096 48 : if (elf_cntl (elf, ELF_C_FDDONE) != 0)
2097 : {
2098 0 : error (0, 0, gettext ("%s: error while reading the file: %s"),
2099 : fname, elf_errmsg (-1));
2100 0 : cleanup_debug ();
2101 0 : return 1;
2102 : }
2103 :
2104 : /* The ELF library better follows our layout when this is not a
2105 : relocatable object file. */
2106 48 : elf_flagelf (newelf, ELF_C_SET,
2107 48 : (ehdr->e_type != ET_REL ? ELF_F_LAYOUT : 0)
2108 48 : | (permissive ? ELF_F_PERMISSIVE : 0));
2109 :
2110 : /* Finally write the file. */
2111 48 : if (elf_update (newelf, ELF_C_WRITE) == -1)
2112 : {
2113 0 : error (0, 0, gettext ("while writing '%s': %s"),
2114 0 : output_fname ?: fname, elf_errmsg (-1));
2115 0 : result = 1;
2116 : }
2117 :
2118 48 : if (remove_shdrs)
2119 : {
2120 : /* libelf can't cope without the section headers being properly intact.
2121 : So we just let it write them normally, and then we nuke them later. */
2122 :
2123 0 : if (newehdr->e_ident[EI_CLASS] == ELFCLASS32)
2124 : {
2125 : assert (offsetof (Elf32_Ehdr, e_shentsize) + sizeof (Elf32_Half)
2126 : == offsetof (Elf32_Ehdr, e_shnum));
2127 : assert (offsetof (Elf32_Ehdr, e_shnum) + sizeof (Elf32_Half)
2128 : == offsetof (Elf32_Ehdr, e_shstrndx));
2129 0 : const Elf32_Off zero_off = 0;
2130 0 : const Elf32_Half zero[3] = { 0, 0, SHN_UNDEF };
2131 0 : if (pwrite_retry (fd, &zero_off, sizeof zero_off,
2132 : offsetof (Elf32_Ehdr, e_shoff)) != sizeof zero_off
2133 0 : || (pwrite_retry (fd, zero, sizeof zero,
2134 : offsetof (Elf32_Ehdr, e_shentsize))
2135 : != sizeof zero)
2136 0 : || ftruncate (fd, shdr_info[shdridx].shdr.sh_offset) < 0)
2137 : {
2138 0 : error (0, errno, gettext ("while writing '%s'"),
2139 0 : output_fname ?: fname);
2140 0 : result = 1;
2141 : }
2142 : }
2143 : else
2144 : {
2145 : assert (offsetof (Elf64_Ehdr, e_shentsize) + sizeof (Elf64_Half)
2146 : == offsetof (Elf64_Ehdr, e_shnum));
2147 : assert (offsetof (Elf64_Ehdr, e_shnum) + sizeof (Elf64_Half)
2148 : == offsetof (Elf64_Ehdr, e_shstrndx));
2149 0 : const Elf64_Off zero_off = 0;
2150 0 : const Elf64_Half zero[3] = { 0, 0, SHN_UNDEF };
2151 0 : if (pwrite_retry (fd, &zero_off, sizeof zero_off,
2152 : offsetof (Elf64_Ehdr, e_shoff)) != sizeof zero_off
2153 0 : || (pwrite_retry (fd, zero, sizeof zero,
2154 : offsetof (Elf64_Ehdr, e_shentsize))
2155 : != sizeof zero)
2156 0 : || ftruncate (fd, shdr_info[shdridx].shdr.sh_offset) < 0)
2157 : {
2158 0 : error (0, errno, gettext ("while writing '%s'"),
2159 0 : output_fname ?: fname);
2160 0 : result = 1;
2161 : }
2162 : }
2163 : }
2164 :
2165 : fail_close:
2166 48 : if (shdr_info != NULL)
2167 : {
2168 : /* For some sections we might have created an table to map symbol
2169 : table indices. */
2170 48 : if (any_symtab_changes)
2171 978 : for (cnt = 1; cnt <= shdridx; ++cnt)
2172 : {
2173 948 : free (shdr_info[cnt].newsymidx);
2174 948 : if (shdr_info[cnt].debug_data != NULL)
2175 47 : free (shdr_info[cnt].debug_data->d_buf);
2176 : }
2177 :
2178 : /* Free data we allocated for the .gnu_debuglink section. */
2179 48 : free (debuglink_buf);
2180 :
2181 : /* Free the memory. */
2182 48 : if ((shnum + 2) * sizeof (struct shdr_info) > MAX_STACK_ALLOC)
2183 0 : free (shdr_info);
2184 : }
2185 :
2186 : /* Free other resources. */
2187 48 : if (shstrtab_data != NULL)
2188 48 : free (shstrtab_data->d_buf);
2189 48 : if (shst != NULL)
2190 48 : dwelf_strtab_free (shst);
2191 :
2192 : /* That was it. Close the descriptors. */
2193 48 : if (elf_end (newelf) != 0)
2194 : {
2195 0 : error (0, 0, gettext ("error while finishing '%s': %s"),
2196 0 : output_fname ?: fname, elf_errmsg (-1));
2197 0 : result = 1;
2198 : }
2199 :
2200 48 : if (debugelf != NULL && elf_end (debugelf) != 0)
2201 : {
2202 0 : error (0, 0, gettext ("error while finishing '%s': %s"), debug_fname,
2203 : elf_errmsg (-1));
2204 0 : result = 1;
2205 : }
2206 :
2207 : fail:
2208 : /* Close the EBL backend. */
2209 48 : if (ebl != NULL)
2210 10 : ebl_closebackend (ebl);
2211 :
2212 48 : cleanup_debug ();
2213 :
2214 : /* If requested, preserve the timestamp. */
2215 48 : if (tvp != NULL)
2216 : {
2217 0 : if (futimens (fd, tvp) != 0)
2218 : {
2219 0 : error (0, errno, gettext ("\
2220 : cannot set access and modification date of '%s'"),
2221 0 : output_fname ?: fname);
2222 0 : result = 1;
2223 : }
2224 : }
2225 :
2226 : /* Close the file descriptor if we created a new file. */
2227 48 : if (output_fname != NULL)
2228 36 : close (fd);
2229 :
2230 : return result;
2231 : }
2232 :
2233 : static void
2234 48 : cleanup_debug (void)
2235 : {
2236 48 : if (debug_fd >= 0)
2237 : {
2238 30 : if (tmp_debug_fname != NULL)
2239 : {
2240 0 : unlink (tmp_debug_fname);
2241 0 : free (tmp_debug_fname);
2242 0 : tmp_debug_fname = NULL;
2243 : }
2244 30 : close (debug_fd);
2245 30 : debug_fd = -1;
2246 : }
2247 48 : }
2248 :
2249 : static int
2250 : handle_ar (int fd, Elf *elf, const char *prefix, const char *fname,
2251 : struct timespec tvp[2])
2252 : {
2253 : size_t prefix_len = prefix == NULL ? 0 : strlen (prefix);
2254 : size_t fname_len = strlen (fname) + 1;
2255 : char new_prefix[prefix_len + 1 + fname_len];
2256 : char *cp = new_prefix;
2257 :
2258 : /* Create the full name of the file. */
2259 : if (prefix != NULL)
2260 : {
2261 : cp = mempcpy (cp, prefix, prefix_len);
2262 : *cp++ = ':';
2263 : }
2264 : memcpy (cp, fname, fname_len);
2265 :
2266 :
2267 : /* Process all the files contained in the archive. */
2268 : Elf *subelf;
2269 : Elf_Cmd cmd = ELF_C_RDWR;
2270 : int result = 0;
2271 : while ((subelf = elf_begin (fd, cmd, elf)) != NULL)
2272 : {
2273 : /* The the header for this element. */
2274 : Elf_Arhdr *arhdr = elf_getarhdr (subelf);
2275 :
2276 : if (elf_kind (subelf) == ELF_K_ELF)
2277 : result |= handle_elf (fd, subelf, new_prefix, arhdr->ar_name, 0, NULL);
2278 : else if (elf_kind (subelf) == ELF_K_AR)
2279 : result |= handle_ar (fd, subelf, new_prefix, arhdr->ar_name, NULL);
2280 :
2281 : /* Get next archive element. */
2282 : cmd = elf_next (subelf);
2283 : if (unlikely (elf_end (subelf) != 0))
2284 : INTERNAL_ERROR (fname);
2285 : }
2286 :
2287 : if (tvp != NULL)
2288 : {
2289 : if (unlikely (futimens (fd, tvp) != 0))
2290 : {
2291 : error (0, errno, gettext ("\
2292 : cannot set access and modification date of '%s'"), fname);
2293 : result = 1;
2294 : }
2295 : }
2296 :
2297 : if (unlikely (close (fd) != 0))
2298 : error (EXIT_FAILURE, errno, gettext ("while closing '%s'"), fname);
2299 :
2300 : return result;
2301 : }
2302 :
2303 :
2304 : #include "debugpred.h"
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