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svlogd: fix compat problem: svlogd -tt should timestanp stderr too
[busybox.git] / modutils / insmod.c
blob6f3b7d0f46383441d086129e19481bc1515cf6b2
1 /* vi: set sw=4 ts=4: */
2 /*
3 * Mini insmod implementation for busybox
4 *
5 * This version of insmod supports ARM, CRIS, H8/300, x86, ia64, x86_64,
6 * m68k, MIPS, PowerPC, S390, SH3/4/5, Sparc, v850e, and x86_64.
7 *
8 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
9 * and Ron Alder <alder@lineo.com>
10 *
11 * Rodney Radford <rradford@mindspring.com> 17-Aug-2004.
12 * Added x86_64 support.
13 *
14 * Miles Bader <miles@gnu.org> added NEC V850E support.
15 *
16 * Modified by Bryan Rittmeyer <bryan@ixiacom.com> to support SH4
17 * and (theoretically) SH3. I have only tested SH4 in little endian mode.
18 *
19 * Modified by Alcove, Julien Gaulmin <julien.gaulmin@alcove.fr> and
20 * Nicolas Ferre <nicolas.ferre@alcove.fr> to support ARM7TDMI. Only
21 * very minor changes required to also work with StrongArm and presumably
22 * all ARM based systems.
23 *
24 * Yoshinori Sato <ysato@users.sourceforge.jp> 19-May-2004.
25 * added Renesas H8/300 support.
26 *
27 * Paul Mundt <lethal@linux-sh.org> 08-Aug-2003.
28 * Integrated support for sh64 (SH-5), from preliminary modutils
29 * patches from Benedict Gaster <benedict.gaster@superh.com>.
30 * Currently limited to support for 32bit ABI.
31 *
32 * Magnus Damm <damm@opensource.se> 22-May-2002.
33 * The plt and got code are now using the same structs.
34 * Added generic linked list code to fully support PowerPC.
35 * Replaced the mess in arch_apply_relocation() with architecture blocks.
36 * The arch_create_got() function got cleaned up with architecture blocks.
37 * These blocks should be easy maintain and sync with obj_xxx.c in modutils.
38 *
39 * Magnus Damm <damm@opensource.se> added PowerPC support 20-Feb-2001.
40 * PowerPC specific code stolen from modutils-2.3.16,
41 * written by Paul Mackerras, Copyright 1996, 1997 Linux International.
42 * I've only tested the code on mpc8xx platforms in big-endian mode.
43 * Did some cleanup and added USE_xxx_ENTRIES...
44 *
45 * Quinn Jensen <jensenq@lineo.com> added MIPS support 23-Feb-2001.
46 * based on modutils-2.4.2
47 * MIPS specific support for Elf loading and relocation.
48 * Copyright 1996, 1997 Linux International.
49 * Contributed by Ralf Baechle <ralf@gnu.ai.mit.edu>
50 *
51 * Based almost entirely on the Linux modutils-2.3.11 implementation.
52 * Copyright 1996, 1997 Linux International.
53 * New implementation contributed by Richard Henderson <rth@tamu.edu>
54 * Based on original work by Bjorn Ekwall <bj0rn@blox.se>
55 * Restructured (and partly rewritten) by:
56 * Björn Ekwall <bj0rn@blox.se> February 1999
57 *
58 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
59 */
60
61 #include "libbb.h"
62 #include <libgen.h>
63 #include <sys/utsname.h>
64
65 #if !ENABLE_FEATURE_2_4_MODULES && !ENABLE_FEATURE_2_6_MODULES
66 #undef ENABLE_FEATURE_2_4_MODULES
67 #define ENABLE_FEATURE_2_4_MODULES 1
68 #endif
69
70 #if !ENABLE_FEATURE_2_4_MODULES
71 #define insmod_ng_main insmod_main
72 #endif
73
74 #if ENABLE_FEATURE_2_6_MODULES
75 extern int insmod_ng_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
76 #endif
77
78
79 #if ENABLE_FEATURE_2_4_MODULES
80
81
82 #if ENABLE_FEATURE_INSMOD_LOADINKMEM
83 #define LOADBITS 0
84 #else
85 #define LOADBITS 1
86 #endif
87
88
89 /* Alpha */
90 #if defined(__alpha__)
91 #define MATCH_MACHINE(x) (x == EM_ALPHA)
92 #define SHT_RELM SHT_RELA
93 #define Elf64_RelM Elf64_Rela
94 #define ELFCLASSM ELFCLASS64
95 #endif
96
97 /* ARM support */
98 #if defined(__arm__)
99 #define MATCH_MACHINE(x) (x == EM_ARM)
100 #define SHT_RELM SHT_REL
101 #define Elf32_RelM Elf32_Rel
102 #define ELFCLASSM ELFCLASS32
103 #define USE_PLT_ENTRIES
104 #define PLT_ENTRY_SIZE 8
105 #define USE_GOT_ENTRIES
106 #define GOT_ENTRY_SIZE 8
107 #define USE_SINGLE
108 #endif
109
110 /* blackfin */
111 #if defined(BFIN)
112 #define MATCH_MACHINE(x) (x == EM_BLACKFIN)
113 #define SHT_RELM SHT_RELA
114 #define Elf32_RelM Elf32_Rela
115 #define ELFCLASSM ELFCLASS32
116 #endif
117
118 /* CRIS */
119 #if defined(__cris__)
120 #define MATCH_MACHINE(x) (x == EM_CRIS)
121 #define SHT_RELM SHT_RELA
122 #define Elf32_RelM Elf32_Rela
123 #define ELFCLASSM ELFCLASS32
124 #ifndef EM_CRIS
125 #define EM_CRIS 76
126 #define R_CRIS_NONE 0
127 #define R_CRIS_32 3
128 #endif
129 #endif
130
131 /* H8/300 */
132 #if defined(__H8300H__) || defined(__H8300S__)
133 #define MATCH_MACHINE(x) (x == EM_H8_300)
134 #define SHT_RELM SHT_RELA
135 #define Elf32_RelM Elf32_Rela
136 #define ELFCLASSM ELFCLASS32
137 #define USE_SINGLE
138 #define SYMBOL_PREFIX "_"
139 #endif
140
141 /* PA-RISC / HP-PA */
142 #if defined(__hppa__)
143 #define MATCH_MACHINE(x) (x == EM_PARISC)
144 #define SHT_RELM SHT_RELA
145 #if defined(__LP64__)
146 #define Elf64_RelM Elf64_Rela
147 #define ELFCLASSM ELFCLASS64
148 #else
149 #define Elf32_RelM Elf32_Rela
150 #define ELFCLASSM ELFCLASS32
151 #endif
152 #endif
153
154 /* x86 */
155 #if defined(__i386__)
156 #ifndef EM_486
157 #define MATCH_MACHINE(x) (x == EM_386)
158 #else
159 #define MATCH_MACHINE(x) (x == EM_386 || x == EM_486)
160 #endif
161 #define SHT_RELM SHT_REL
162 #define Elf32_RelM Elf32_Rel
163 #define ELFCLASSM ELFCLASS32
164 #define USE_GOT_ENTRIES
165 #define GOT_ENTRY_SIZE 4
166 #define USE_SINGLE
167 #endif
168
169 /* IA64, aka Itanium */
170 #if defined(__ia64__)
171 #define MATCH_MACHINE(x) (x == EM_IA_64)
172 #define SHT_RELM SHT_RELA
173 #define Elf64_RelM Elf64_Rela
174 #define ELFCLASSM ELFCLASS64
175 #endif
176
177 /* m68k */
178 #if defined(__mc68000__)
179 #define MATCH_MACHINE(x) (x == EM_68K)
180 #define SHT_RELM SHT_RELA
181 #define Elf32_RelM Elf32_Rela
182 #define ELFCLASSM ELFCLASS32
183 #define USE_GOT_ENTRIES
184 #define GOT_ENTRY_SIZE 4
185 #define USE_SINGLE
186 #endif
187
188 /* Microblaze */
189 #if defined(__microblaze__)
190 #define USE_SINGLE
191 #define MATCH_MACHINE(x) (x == EM_XILINX_MICROBLAZE)
192 #define SHT_RELM SHT_RELA
193 #define Elf32_RelM Elf32_Rela
194 #define ELFCLASSM ELFCLASS32
195 #endif
196
197 /* MIPS */
198 #if defined(__mips__)
199 #define MATCH_MACHINE(x) (x == EM_MIPS || x == EM_MIPS_RS3_LE)
200 #define SHT_RELM SHT_REL
201 #define Elf32_RelM Elf32_Rel
202 #define ELFCLASSM ELFCLASS32
203 /* Account for ELF spec changes. */
204 #ifndef EM_MIPS_RS3_LE
205 #ifdef EM_MIPS_RS4_BE
206 #define EM_MIPS_RS3_LE EM_MIPS_RS4_BE
207 #else
208 #define EM_MIPS_RS3_LE 10
209 #endif
210 #endif /* !EM_MIPS_RS3_LE */
211 #define ARCHDATAM "__dbe_table"
212 #endif
213
214 /* Nios II */
215 #if defined(__nios2__)
216 #define MATCH_MACHINE(x) (x == EM_ALTERA_NIOS2)
217 #define SHT_RELM SHT_RELA
218 #define Elf32_RelM Elf32_Rela
219 #define ELFCLASSM ELFCLASS32
220 #endif
221
222 /* PowerPC */
223 #if defined(__powerpc64__)
224 #define MATCH_MACHINE(x) (x == EM_PPC64)
225 #define SHT_RELM SHT_RELA
226 #define Elf64_RelM Elf64_Rela
227 #define ELFCLASSM ELFCLASS64
228 #elif defined(__powerpc__)
229 #define MATCH_MACHINE(x) (x == EM_PPC)
230 #define SHT_RELM SHT_RELA
231 #define Elf32_RelM Elf32_Rela
232 #define ELFCLASSM ELFCLASS32
233 #define USE_PLT_ENTRIES
234 #define PLT_ENTRY_SIZE 16
235 #define USE_PLT_LIST
236 #define LIST_ARCHTYPE ElfW(Addr)
237 #define USE_LIST
238 #define ARCHDATAM "__ftr_fixup"
239 #endif
240
241 /* S390 */
242 #if defined(__s390__)
243 #define MATCH_MACHINE(x) (x == EM_S390)
244 #define SHT_RELM SHT_RELA
245 #define Elf32_RelM Elf32_Rela
246 #define ELFCLASSM ELFCLASS32
247 #define USE_PLT_ENTRIES
248 #define PLT_ENTRY_SIZE 8
249 #define USE_GOT_ENTRIES
250 #define GOT_ENTRY_SIZE 8
251 #define USE_SINGLE
252 #endif
253
254 /* SuperH */
255 #if defined(__sh__)
256 #define MATCH_MACHINE(x) (x == EM_SH)
257 #define SHT_RELM SHT_RELA
258 #define Elf32_RelM Elf32_Rela
259 #define ELFCLASSM ELFCLASS32
260 #define USE_GOT_ENTRIES
261 #define GOT_ENTRY_SIZE 4
262 #define USE_SINGLE
263 /* the SH changes have only been tested in =little endian= mode */
264 /* I'm not sure about big endian, so let's warn: */
265 #if defined(__sh__) && BB_BIG_ENDIAN
266 # error insmod.c may require changes for use on big endian SH
267 #endif
268 /* it may or may not work on the SH1/SH2... Error on those also */
269 #if ((!(defined(__SH3__) || defined(__SH4__) || defined(__SH5__)))) && (defined(__sh__))
270 #error insmod.c may require changes for SH1 or SH2 use
271 #endif
272 #endif
273
274 /* Sparc */
275 #if defined(__sparc__)
276 #define MATCH_MACHINE(x) (x == EM_SPARC)
277 #define SHT_RELM SHT_RELA
278 #define Elf32_RelM Elf32_Rela
279 #define ELFCLASSM ELFCLASS32
280 #endif
281
282 /* v850e */
283 #if defined(__v850e__)
284 #define MATCH_MACHINE(x) ((x) == EM_V850 || (x) == EM_CYGNUS_V850)
285 #define SHT_RELM SHT_RELA
286 #define Elf32_RelM Elf32_Rela
287 #define ELFCLASSM ELFCLASS32
288 #define USE_PLT_ENTRIES
289 #define PLT_ENTRY_SIZE 8
290 #define USE_SINGLE
291 #ifndef EM_CYGNUS_V850 /* grumble */
292 #define EM_CYGNUS_V850 0x9080
293 #endif
294 #define SYMBOL_PREFIX "_"
295 #endif
296
297 /* X86_64 */
298 #if defined(__x86_64__)
299 #define MATCH_MACHINE(x) (x == EM_X86_64)
300 #define SHT_RELM SHT_RELA
301 #define USE_GOT_ENTRIES
302 #define GOT_ENTRY_SIZE 8
303 #define USE_SINGLE
304 #define Elf64_RelM Elf64_Rela
305 #define ELFCLASSM ELFCLASS64
306 #endif
307
308 #ifndef SHT_RELM
309 #error Sorry, but insmod.c does not yet support this architecture...
310 #endif
311
312
313 //----------------------------------------------------------------------------
314 //--------modutils module.h, lines 45-242
315 //----------------------------------------------------------------------------
316
317 /* Definitions for the Linux module syscall interface.
318 Copyright 1996, 1997 Linux International.
319
320 Contributed by Richard Henderson <rth@tamu.edu>
321
322 This file is part of the Linux modutils.
323
324 This program is free software; you can redistribute it and/or modify it
325 under the terms of the GNU General Public License as published by the
326 Free Software Foundation; either version 2 of the License, or (at your
327 option) any later version.
328
329 This program is distributed in the hope that it will be useful, but
330 WITHOUT ANY WARRANTY; without even the implied warranty of
331 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
332 General Public License for more details.
333
334 You should have received a copy of the GNU General Public License
335 along with this program; if not, write to the Free Software Foundation,
336 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
337
338
339 #ifndef MODUTILS_MODULE_H
340
341 /*======================================================================*/
342 /* For sizeof() which are related to the module platform and not to the
343 environment isnmod is running in, use sizeof_xx instead of sizeof(xx). */
344
345 #define tgt_sizeof_char sizeof(char)
346 #define tgt_sizeof_short sizeof(short)
347 #define tgt_sizeof_int sizeof(int)
348 #define tgt_sizeof_long sizeof(long)
349 #define tgt_sizeof_char_p sizeof(char *)
350 #define tgt_sizeof_void_p sizeof(void *)
351 #define tgt_long long
352
353 #if defined(__sparc__) && !defined(__sparc_v9__) && defined(ARCH_sparc64)
354 #undef tgt_sizeof_long
355 #undef tgt_sizeof_char_p
356 #undef tgt_sizeof_void_p
357 #undef tgt_long
358 enum {
359 tgt_sizeof_long = 8,
360 tgt_sizeof_char_p = 8,
361 tgt_sizeof_void_p = 8
362 };
363 #define tgt_long long long
364 #endif
365
366 /*======================================================================*/
367 /* The structures used in Linux 2.1. */
368
369 /* Note: new_module_symbol does not use tgt_long intentionally */
370 struct new_module_symbol {
371 unsigned long value;
372 unsigned long name;
373 };
374
375 struct new_module_persist;
376
377 struct new_module_ref {
378 unsigned tgt_long dep; /* kernel addresses */
379 unsigned tgt_long ref;
380 unsigned tgt_long next_ref;
381 };
382
383 struct new_module {
384 unsigned tgt_long size_of_struct; /* == sizeof(module) */
385 unsigned tgt_long next;
386 unsigned tgt_long name;
387 unsigned tgt_long size;
388
389 tgt_long usecount;
390 unsigned tgt_long flags; /* AUTOCLEAN et al */
391
392 unsigned nsyms;
393 unsigned ndeps;
394
395 unsigned tgt_long syms;
396 unsigned tgt_long deps;
397 unsigned tgt_long refs;
398 unsigned tgt_long init;
399 unsigned tgt_long cleanup;
400 unsigned tgt_long ex_table_start;
401 unsigned tgt_long ex_table_end;
402 #ifdef __alpha__
403 unsigned tgt_long gp;
404 #endif
405 /* Everything after here is extension. */
406 unsigned tgt_long persist_start;
407 unsigned tgt_long persist_end;
408 unsigned tgt_long can_unload;
409 unsigned tgt_long runsize;
410 const char *kallsyms_start; /* All symbols for kernel debugging */
411 const char *kallsyms_end;
412 const char *archdata_start; /* arch specific data for module */
413 const char *archdata_end;
414 const char *kernel_data; /* Reserved for kernel internal use */
415 };
416
417 #ifdef ARCHDATAM
418 #define ARCHDATA_SEC_NAME ARCHDATAM
419 #else
420 #define ARCHDATA_SEC_NAME "__archdata"
421 #endif
422 #define KALLSYMS_SEC_NAME "__kallsyms"
423
424
425 struct new_module_info {
426 unsigned long addr;
427 unsigned long size;
428 unsigned long flags;
429 long usecount;
430 };
431
432 /* Bits of module.flags. */
433 enum {
434 NEW_MOD_RUNNING = 1,
435 NEW_MOD_DELETED = 2,
436 NEW_MOD_AUTOCLEAN = 4,
437 NEW_MOD_VISITED = 8,
438 NEW_MOD_USED_ONCE = 16
439 };
440
441 int init_module(const char *name, const struct new_module *);
442 int query_module(const char *name, int which, void *buf,
443 size_t bufsize, size_t *ret);
444
445 /* Values for query_module's which. */
446 enum {
447 QM_MODULES = 1,
448 QM_DEPS = 2,
449 QM_REFS = 3,
450 QM_SYMBOLS = 4,
451 QM_INFO = 5
452 };
453
454 /*======================================================================*/
455 /* The system calls unchanged between 2.0 and 2.1. */
456
457 unsigned long create_module(const char *, size_t);
458 int delete_module(const char *);
459
460
461 #endif /* module.h */
462
463 //----------------------------------------------------------------------------
464 //--------end of modutils module.h
465 //----------------------------------------------------------------------------
466
467
468
469 //----------------------------------------------------------------------------
470 //--------modutils obj.h, lines 253-462
471 //----------------------------------------------------------------------------
472
473 /* Elf object file loading and relocation routines.
474 Copyright 1996, 1997 Linux International.
475
476 Contributed by Richard Henderson <rth@tamu.edu>
477
478 This file is part of the Linux modutils.
479
480 This program is free software; you can redistribute it and/or modify it
481 under the terms of the GNU General Public License as published by the
482 Free Software Foundation; either version 2 of the License, or (at your
483 option) any later version.
484
485 This program is distributed in the hope that it will be useful, but
486 WITHOUT ANY WARRANTY; without even the implied warranty of
487 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
488 General Public License for more details.
489
490 You should have received a copy of the GNU General Public License
491 along with this program; if not, write to the Free Software Foundation,
492 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
493
494
495 #ifndef MODUTILS_OBJ_H
496
497 /* The relocatable object is manipulated using elfin types. */
498
499 #include <elf.h>
500 #include <endian.h>
501
502 #ifndef ElfW
503 # if ELFCLASSM == ELFCLASS32
504 # define ElfW(x) Elf32_ ## x
505 # define ELFW(x) ELF32_ ## x
506 # else
507 # define ElfW(x) Elf64_ ## x
508 # define ELFW(x) ELF64_ ## x
509 # endif
510 #endif
511
512 /* For some reason this is missing from some ancient C libraries.... */
513 #ifndef ELF32_ST_INFO
514 # define ELF32_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf))
515 #endif
516
517 #ifndef ELF64_ST_INFO
518 # define ELF64_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf))
519 #endif
520
521 #define ELF_ST_BIND(info) ELFW(ST_BIND)(info)
522 #define ELF_ST_TYPE(info) ELFW(ST_TYPE)(info)
523 #define ELF_ST_INFO(bind, type) ELFW(ST_INFO)(bind, type)
524 #define ELF_R_TYPE(val) ELFW(R_TYPE)(val)
525 #define ELF_R_SYM(val) ELFW(R_SYM)(val)
526
527 struct obj_string_patch;
528 struct obj_symbol_patch;
529
530 struct obj_section
531 {
532 ElfW(Shdr) header;
533 const char *name;
534 char *contents;
535 struct obj_section *load_next;
536 int idx;
537 };
538
539 struct obj_symbol
540 {
541 struct obj_symbol *next; /* hash table link */
542 const char *name;
543 unsigned long value;
544 unsigned long size;
545 int secidx; /* the defining section index/module */
546 int info;
547 int ksymidx; /* for export to the kernel symtab */
548 int referenced; /* actually used in the link */
549 };
550
551 /* Hardcode the hash table size. We shouldn't be needing so many
552 symbols that we begin to degrade performance, and we get a big win
553 by giving the compiler a constant divisor. */
554
555 #define HASH_BUCKETS 521
556
557 struct obj_file {
558 ElfW(Ehdr) header;
559 ElfW(Addr) baseaddr;
560 struct obj_section **sections;
561 struct obj_section *load_order;
562 struct obj_section **load_order_search_start;
563 struct obj_string_patch *string_patches;
564 struct obj_symbol_patch *symbol_patches;
565 int (*symbol_cmp)(const char *, const char *);
566 unsigned long (*symbol_hash)(const char *);
567 unsigned long local_symtab_size;
568 struct obj_symbol **local_symtab;
569 struct obj_symbol *symtab[HASH_BUCKETS];
570 };
571
572 enum obj_reloc {
573 obj_reloc_ok,
574 obj_reloc_overflow,
575 obj_reloc_dangerous,
576 obj_reloc_unhandled
577 };
578
579 struct obj_string_patch {
580 struct obj_string_patch *next;
581 int reloc_secidx;
582 ElfW(Addr) reloc_offset;
583 ElfW(Addr) string_offset;
584 };
585
586 struct obj_symbol_patch {
587 struct obj_symbol_patch *next;
588 int reloc_secidx;
589 ElfW(Addr) reloc_offset;
590 struct obj_symbol *sym;
591 };
592
593
594 /* Generic object manipulation routines. */
595
596 static unsigned long obj_elf_hash(const char *);
597
598 static unsigned long obj_elf_hash_n(const char *, unsigned long len);
599
600 static struct obj_symbol *obj_find_symbol(struct obj_file *f,
601 const char *name);
602
603 static ElfW(Addr) obj_symbol_final_value(struct obj_file *f,
604 struct obj_symbol *sym);
605
606 #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING
607 static void obj_set_symbol_compare(struct obj_file *f,
608 int (*cmp)(const char *, const char *),
609 unsigned long (*hash)(const char *));
610 #endif
611
612 static struct obj_section *obj_find_section(struct obj_file *f,
613 const char *name);
614
615 static void obj_insert_section_load_order(struct obj_file *f,
616 struct obj_section *sec);
617
618 static struct obj_section *obj_create_alloced_section(struct obj_file *f,
619 const char *name,
620 unsigned long align,
621 unsigned long size);
622
623 static struct obj_section *obj_create_alloced_section_first(struct obj_file *f,
624 const char *name,
625 unsigned long align,
626 unsigned long size);
627
628 static void *obj_extend_section(struct obj_section *sec, unsigned long more);
629
630 static int obj_string_patch(struct obj_file *f, int secidx, ElfW(Addr) offset,
631 const char *string);
632
633 static int obj_symbol_patch(struct obj_file *f, int secidx, ElfW(Addr) offset,
634 struct obj_symbol *sym);
635
636 static int obj_check_undefineds(struct obj_file *f);
637
638 static void obj_allocate_commons(struct obj_file *f);
639
640 static unsigned long obj_load_size(struct obj_file *f);
641
642 static int obj_relocate(struct obj_file *f, ElfW(Addr) base);
643
644 static struct obj_file *obj_load(FILE *f, int loadprogbits);
645
646 static int obj_create_image(struct obj_file *f, char *image);
647
648 /* Architecture specific manipulation routines. */
649
650 static struct obj_file *arch_new_file(void);
651
652 static struct obj_section *arch_new_section(void);
653
654 static struct obj_symbol *arch_new_symbol(void);
655
656 static enum obj_reloc arch_apply_relocation(struct obj_file *f,
657 struct obj_section *targsec,
658 struct obj_section *symsec,
659 struct obj_symbol *sym,
660 ElfW(RelM) *rel, ElfW(Addr) value);
661
662 static void arch_create_got(struct obj_file *f);
663 #if ENABLE_FEATURE_CHECK_TAINTED_MODULE
664 static int obj_gpl_license(struct obj_file *f, const char **license);
665 #endif /* FEATURE_CHECK_TAINTED_MODULE */
666 #endif /* obj.h */
667 //----------------------------------------------------------------------------
668 //--------end of modutils obj.h
669 //----------------------------------------------------------------------------
670
671
672 /* SPFX is always a string, so it can be concatenated to string constants. */
673 #ifdef SYMBOL_PREFIX
674 #define SPFX SYMBOL_PREFIX
675 #else
676 #define SPFX ""
677 #endif
678
679
680 #define _PATH_MODULES "/lib/modules"
681 enum { STRVERSIONLEN = 64 };
682
683 /*======================================================================*/
684
685 #define OPTION_STR "sLo:fkvqx" USE_FEATURE_INSMOD_LOAD_MAP("m")
686 enum {
687 OPT_s = 0x1, // -s /* log to syslog */
688 /* Not supported but kernel needs this for request_module(),
689 as this calls: modprobe -k -s -- <module>
690 so silently ignore this flag */
691 OPT_L = 0x2, // -L /* Stub warning */
692 /* Compatibility with modprobe.
693 In theory, this does locking, but we don't do
694 that. So be careful and plan your life around not
695 loading the same module 50 times concurrently. */
696 OPT_o = 0x4, // -o /* name the output module */
697 OPT_f = 0x8, // -f /* force loading */
698 OPT_k = 0x10, // -k /* module loaded by kerneld, auto-cleanable */
699 OPT_v = 0x20, // -v /* verbose output */
700 OPT_q = 0x40, // -q /* silent */
701 OPT_x = 0x80, // -x /* do not export externs */
702 OPT_m = 0x100, // -m /* print module load map */
703 };
704 #define flag_force_load (option_mask32 & OPT_f)
705 #define flag_autoclean (option_mask32 & OPT_k)
706 #define flag_verbose (option_mask32 & OPT_v)
707 #define flag_quiet (option_mask32 & OPT_q)
708 #define flag_noexport (option_mask32 & OPT_x)
709 #if ENABLE_FEATURE_INSMOD_LOAD_MAP
710 #define flag_print_load_map (option_mask32 & OPT_m)
711 #else
712 #define flag_print_load_map 0
713 #endif
714
715 /*======================================================================*/
716
717 #if defined(USE_LIST)
718
719 struct arch_list_entry
720 {
721 struct arch_list_entry *next;
722 LIST_ARCHTYPE addend;
723 int offset;
724 int inited : 1;
725 };
726
727 #endif
728
729 #if defined(USE_SINGLE)
730
731 struct arch_single_entry
732 {
733 int offset;
734 int inited : 1;
735 int allocated : 1;
736 };
737
738 #endif
739
740 #if defined(__mips__)
741 struct mips_hi16
742 {
743 struct mips_hi16 *next;
744 ElfW(Addr) *addr;
745 ElfW(Addr) value;
746 };
747 #endif
748
749 struct arch_file {
750 struct obj_file root;
751 #if defined(USE_PLT_ENTRIES)
752 struct obj_section *plt;
753 #endif
754 #if defined(USE_GOT_ENTRIES)
755 struct obj_section *got;
756 #endif
757 #if defined(__mips__)
758 struct mips_hi16 *mips_hi16_list;
759 #endif
760 };
761
762 struct arch_symbol {
763 struct obj_symbol root;
764 #if defined(USE_PLT_ENTRIES)
765 #if defined(USE_PLT_LIST)
766 struct arch_list_entry *pltent;
767 #else
768 struct arch_single_entry pltent;
769 #endif
770 #endif
771 #if defined(USE_GOT_ENTRIES)
772 struct arch_single_entry gotent;
773 #endif
774 };
775
776
777 struct external_module {
778 const char *name;
779 ElfW(Addr) addr;
780 int used;
781 size_t nsyms;
782 struct new_module_symbol *syms;
783 };
784
785 static struct new_module_symbol *ksyms;
786 static size_t nksyms;
787
788 static struct external_module *ext_modules;
789 static int n_ext_modules;
790 static int n_ext_modules_used;
791 extern int delete_module(const char *);
792
793 static char *m_filename;
794 static char *m_fullName;
795
796
797 /*======================================================================*/
798
799
800 static int check_module_name_match(const char *filename, struct stat *statbuf,
801 void *userdata, int depth)
802 {
803 char *fullname = (char *) userdata;
804
805 if (fullname[0] == '\0')
806 return FALSE;
807 else {
808 char *tmp, *tmp1 = xstrdup(filename);
809 tmp = bb_get_last_path_component_nostrip(tmp1);
810 if (strcmp(tmp, fullname) == 0) {
811 free(tmp1);
812 /* Stop searching if we find a match */
813 m_filename = xstrdup(filename);
814 return FALSE;
815 }
816 free(tmp1);
817 }
818 return TRUE;
819 }
820
821
822 /*======================================================================*/
823
824 static struct obj_file *arch_new_file(void)
825 {
826 struct arch_file *f;
827 f = xmalloc(sizeof(*f));
828
829 memset(f, 0, sizeof(*f));
830
831 return &f->root;
832 }
833
834 static struct obj_section *arch_new_section(void)
835 {
836 return xmalloc(sizeof(struct obj_section));
837 }
838
839 static struct obj_symbol *arch_new_symbol(void)
840 {
841 struct arch_symbol *sym;
842 sym = xmalloc(sizeof(*sym));
843
844 memset(sym, 0, sizeof(*sym));
845
846 return &sym->root;
847 }
848
849 static enum obj_reloc
850 arch_apply_relocation(struct obj_file *f,
851 struct obj_section *targsec,
852 struct obj_section *symsec,
853 struct obj_symbol *sym,
854 ElfW(RelM) *rel, ElfW(Addr) v)
855 {
856 struct arch_file *ifile = (struct arch_file *) f;
857 enum obj_reloc ret = obj_reloc_ok;
858 ElfW(Addr) *loc = (ElfW(Addr) *) (targsec->contents + rel->r_offset);
859 ElfW(Addr) dot = targsec->header.sh_addr + rel->r_offset;
860 #if defined(USE_GOT_ENTRIES) || defined(USE_PLT_ENTRIES)
861 struct arch_symbol *isym = (struct arch_symbol *) sym;
862 #endif
863 #if defined(__arm__) || defined(__i386__) || defined(__mc68000__) || defined(__sh__) || defined(__s390__)
864 #if defined(USE_GOT_ENTRIES)
865 ElfW(Addr) got = ifile->got ? ifile->got->header.sh_addr : 0;
866 #endif
867 #endif
868 #if defined(USE_PLT_ENTRIES)
869 ElfW(Addr) plt = ifile->plt ? ifile->plt->header.sh_addr : 0;
870 unsigned long *ip;
871 # if defined(USE_PLT_LIST)
872 struct arch_list_entry *pe;
873 # else
874 struct arch_single_entry *pe;
875 # endif
876 #endif
877
878 switch (ELF_R_TYPE(rel->r_info)) {
879
880 #if defined(__arm__)
881
882 case R_ARM_NONE:
883 break;
884
885 case R_ARM_ABS32:
886 *loc += v;
887 break;
888
889 case R_ARM_GOT32:
890 goto bb_use_got;
891
892 case R_ARM_GOTPC:
893 /* relative reloc, always to _GLOBAL_OFFSET_TABLE_
894 * (which is .got) similar to branch,
895 * but is full 32 bits relative */
896
897 *loc += got - dot;
898 break;
899
900 case R_ARM_PC24:
901 case R_ARM_PLT32:
902 goto bb_use_plt;
903
904 case R_ARM_GOTOFF: /* address relative to the got */
905 *loc += v - got;
906 break;
907
908 #elif defined(__cris__)
909
910 case R_CRIS_NONE:
911 break;
912
913 case R_CRIS_32:
914 /* CRIS keeps the relocation value in the r_addend field and
915 * should not use whats in *loc at all
916 */
917 *loc = v;
918 break;
919
920 #elif defined(__H8300H__) || defined(__H8300S__)
921
922 case R_H8_DIR24R8:
923 loc = (ElfW(Addr) *)((ElfW(Addr))loc - 1);
924 *loc = (*loc & 0xff000000) | ((*loc & 0xffffff) + v);
925 break;
926 case R_H8_DIR24A8:
927 *loc += v;
928 break;
929 case R_H8_DIR32:
930 case R_H8_DIR32A16:
931 *loc += v;
932 break;
933 case R_H8_PCREL16:
934 v -= dot + 2;
935 if ((ElfW(Sword))v > 0x7fff ||
936 (ElfW(Sword))v < -(ElfW(Sword))0x8000)
937 ret = obj_reloc_overflow;
938 else
939 *(unsigned short *)loc = v;
940 break;
941 case R_H8_PCREL8:
942 v -= dot + 1;
943 if ((ElfW(Sword))v > 0x7f ||
944 (ElfW(Sword))v < -(ElfW(Sword))0x80)
945 ret = obj_reloc_overflow;
946 else
947 *(unsigned char *)loc = v;
948 break;
949
950 #elif defined(__i386__)
951
952 case R_386_NONE:
953 break;
954
955 case R_386_32:
956 *loc += v;
957 break;
958
959 case R_386_PLT32:
960 case R_386_PC32:
961 *loc += v - dot;
962 break;
963
964 case R_386_GLOB_DAT:
965 case R_386_JMP_SLOT:
966 *loc = v;
967 break;
968
969 case R_386_RELATIVE:
970 *loc += f->baseaddr;
971 break;
972
973 case R_386_GOTPC:
974 *loc += got - dot;
975 break;
976
977 case R_386_GOT32:
978 goto bb_use_got;
979
980 case R_386_GOTOFF:
981 *loc += v - got;
982 break;
983
984 #elif defined(__microblaze__)
985 case R_MICROBLAZE_NONE:
986 case R_MICROBLAZE_64_NONE:
987 case R_MICROBLAZE_32_SYM_OP_SYM:
988 case R_MICROBLAZE_32_PCREL:
989 break;
990
991 case R_MICROBLAZE_64_PCREL: {
992 /* dot is the address of the current instruction.
993 * v is the target symbol address.
994 * So we need to extract the offset in the code,
995 * adding v, then subtrating the current address
996 * of this instruction.
997 * Ex: "IMM 0xFFFE bralid 0x0000" = "bralid 0xFFFE0000"
998 */
999
1000 /* Get split offset stored in code */
1001 unsigned int temp = (loc[0] & 0xFFFF) << 16 |
1002 (loc[1] & 0xFFFF);
1003
1004 /* Adjust relative offset. -4 adjustment required
1005 * because dot points to the IMM insn, but branch
1006 * is computed relative to the branch instruction itself.
1007 */
1008 temp += v - dot - 4;
1009
1010 /* Store back into code */
1011 loc[0] = (loc[0] & 0xFFFF0000) | temp >> 16;
1012 loc[1] = (loc[1] & 0xFFFF0000) | (temp & 0xFFFF);
1013
1014 break;
1015 }
1016
1017 case R_MICROBLAZE_32:
1018 *loc += v;
1019 break;
1020
1021 case R_MICROBLAZE_64: {
1022 /* Get split pointer stored in code */
1023 unsigned int temp1 = (loc[0] & 0xFFFF) << 16 |
1024 (loc[1] & 0xFFFF);
1025
1026 /* Add reloc offset */
1027 temp1+=v;
1028
1029 /* Store back into code */
1030 loc[0] = (loc[0] & 0xFFFF0000) | temp1 >> 16;
1031 loc[1] = (loc[1] & 0xFFFF0000) | (temp1 & 0xFFFF);
1032
1033 break;
1034 }
1035
1036 case R_MICROBLAZE_32_PCREL_LO:
1037 case R_MICROBLAZE_32_LO:
1038 case R_MICROBLAZE_SRO32:
1039 case R_MICROBLAZE_SRW32:
1040 ret = obj_reloc_unhandled;
1041 break;
1042
1043 #elif defined(__mc68000__)
1044
1045 case R_68K_NONE:
1046 break;
1047
1048 case R_68K_32:
1049 *loc += v;
1050 break;
1051
1052 case R_68K_8:
1053 if (v > 0xff) {
1054 ret = obj_reloc_overflow;
1055 }
1056 *(char *)loc = v;
1057 break;
1058
1059 case R_68K_16:
1060 if (v > 0xffff) {
1061 ret = obj_reloc_overflow;
1062 }
1063 *(short *)loc = v;
1064 break;
1065
1066 case R_68K_PC8:
1067 v -= dot;
1068 if ((ElfW(Sword))v > 0x7f ||
1069 (ElfW(Sword))v < -(ElfW(Sword))0x80) {
1070 ret = obj_reloc_overflow;
1071 }
1072 *(char *)loc = v;
1073 break;
1074
1075 case R_68K_PC16:
1076 v -= dot;
1077 if ((ElfW(Sword))v > 0x7fff ||
1078 (ElfW(Sword))v < -(ElfW(Sword))0x8000) {
1079 ret = obj_reloc_overflow;
1080 }
1081 *(short *)loc = v;
1082 break;
1083
1084 case R_68K_PC32:
1085 *(int *)loc = v - dot;
1086 break;
1087
1088 case R_68K_GLOB_DAT:
1089 case R_68K_JMP_SLOT:
1090 *loc = v;
1091 break;
1092
1093 case R_68K_RELATIVE:
1094 *(int *)loc += f->baseaddr;
1095 break;
1096
1097 case R_68K_GOT32:
1098 goto bb_use_got;
1099
1100 # ifdef R_68K_GOTOFF
1101 case R_68K_GOTOFF:
1102 *loc += v - got;
1103 break;
1104 # endif
1105
1106 #elif defined(__mips__)
1107
1108 case R_MIPS_NONE:
1109 break;
1110
1111 case R_MIPS_32:
1112 *loc += v;
1113 break;
1114
1115 case R_MIPS_26:
1116 if (v % 4)
1117 ret = obj_reloc_dangerous;
1118 if ((v & 0xf0000000) != ((dot + 4) & 0xf0000000))
1119 ret = obj_reloc_overflow;
1120 *loc =
1121 (*loc & ~0x03ffffff) | ((*loc + (v >> 2)) &
1122 0x03ffffff);
1123 break;
1124
1125 case R_MIPS_HI16:
1126 {
1127 struct mips_hi16 *n;
1128
1129 /* We cannot relocate this one now because we don't know the value
1130 of the carry we need to add. Save the information, and let LO16
1131 do the actual relocation. */
1132 n = xmalloc(sizeof *n);
1133 n->addr = loc;
1134 n->value = v;
1135 n->next = ifile->mips_hi16_list;
1136 ifile->mips_hi16_list = n;
1137 break;
1138 }
1139
1140 case R_MIPS_LO16:
1141 {
1142 unsigned long insnlo = *loc;
1143 ElfW(Addr) val, vallo;
1144
1145 /* Sign extend the addend we extract from the lo insn. */
1146 vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000;
1147
1148 if (ifile->mips_hi16_list != NULL) {
1149 struct mips_hi16 *l;
1150
1151 l = ifile->mips_hi16_list;
1152 while (l != NULL) {
1153 struct mips_hi16 *next;
1154 unsigned long insn;
1155
1156 /* Do the HI16 relocation. Note that we actually don't
1157 need to know anything about the LO16 itself, except where
1158 to find the low 16 bits of the addend needed by the LO16. */
1159 insn = *l->addr;
1160 val =
1161 ((insn & 0xffff) << 16) +
1162 vallo;
1163 val += v;
1164
1165 /* Account for the sign extension that will happen in the
1166 low bits. */
1167 val =
1168 ((val >> 16) +
1169 ((val & 0x8000) !=
1170 0)) & 0xffff;
1171
1172 insn = (insn & ~0xffff) | val;
1173 *l->addr = insn;
1174
1175 next = l->next;
1176 free(l);
1177 l = next;
1178 }
1179
1180 ifile->mips_hi16_list = NULL;
1181 }
1182
1183 /* Ok, we're done with the HI16 relocs. Now deal with the LO16. */
1184 val = v + vallo;
1185 insnlo = (insnlo & ~0xffff) | (val & 0xffff);
1186 *loc = insnlo;
1187 break;
1188 }
1189
1190 #elif defined(__nios2__)
1191
1192 case R_NIOS2_NONE:
1193 break;
1194
1195 case R_NIOS2_BFD_RELOC_32:
1196 *loc += v;
1197 break;
1198
1199 case R_NIOS2_BFD_RELOC_16:
1200 if (v > 0xffff) {
1201 ret = obj_reloc_overflow;
1202 }
1203 *(short *)loc = v;
1204 break;
1205
1206 case R_NIOS2_BFD_RELOC_8:
1207 if (v > 0xff) {
1208 ret = obj_reloc_overflow;
1209 }
1210 *(char *)loc = v;
1211 break;
1212
1213 case R_NIOS2_S16:
1214 {
1215 Elf32_Addr word;
1216
1217 if ((Elf32_Sword)v > 0x7fff ||
1218 (Elf32_Sword)v < -(Elf32_Sword)0x8000) {
1219 ret = obj_reloc_overflow;
1220 }
1221
1222 word = *loc;
1223 *loc = ((((word >> 22) << 16) | (v & 0xffff)) << 6) |
1224 (word & 0x3f);
1225 }
1226 break;
1227
1228 case R_NIOS2_U16:
1229 {
1230 Elf32_Addr word;
1231
1232 if (v > 0xffff) {
1233 ret = obj_reloc_overflow;
1234 }
1235
1236 word = *loc;
1237 *loc = ((((word >> 22) << 16) | (v & 0xffff)) << 6) |
1238 (word & 0x3f);
1239 }
1240 break;
1241
1242 case R_NIOS2_PCREL16:
1243 {
1244 Elf32_Addr word;
1245
1246 v -= dot + 4;
1247 if ((Elf32_Sword)v > 0x7fff ||
1248 (Elf32_Sword)v < -(Elf32_Sword)0x8000) {
1249 ret = obj_reloc_overflow;
1250 }
1251
1252 word = *loc;
1253 *loc = ((((word >> 22) << 16) | (v & 0xffff)) << 6) | (word & 0x3f);
1254 }
1255 break;
1256
1257 case R_NIOS2_GPREL:
1258 {
1259 Elf32_Addr word, gp;
1260 /* get _gp */
1261 gp = obj_symbol_final_value(f, obj_find_symbol(f, SPFX "_gp"));
1262 v-=gp;
1263 if ((Elf32_Sword)v > 0x7fff ||
1264 (Elf32_Sword)v < -(Elf32_Sword)0x8000) {
1265 ret = obj_reloc_overflow;
1266 }
1267
1268 word = *loc;
1269 *loc = ((((word >> 22) << 16) | (v & 0xffff)) << 6) | (word & 0x3f);
1270 }
1271 break;
1272
1273 case R_NIOS2_CALL26:
1274 if (v & 3)
1275 ret = obj_reloc_dangerous;
1276 if ((v >> 28) != (dot >> 28))
1277 ret = obj_reloc_overflow;
1278 *loc = (*loc & 0x3f) | ((v >> 2) << 6);
1279 break;
1280
1281 case R_NIOS2_IMM5:
1282 {
1283 Elf32_Addr word;
1284
1285 if (v > 0x1f) {
1286 ret = obj_reloc_overflow;
1287 }
1288
1289 word = *loc & ~0x7c0;
1290 *loc = word | ((v & 0x1f) << 6);
1291 }
1292 break;
1293
1294 case R_NIOS2_IMM6:
1295 {
1296 Elf32_Addr word;
1297
1298 if (v > 0x3f) {
1299 ret = obj_reloc_overflow;
1300 }
1301
1302 word = *loc & ~0xfc0;
1303 *loc = word | ((v & 0x3f) << 6);
1304 }
1305 break;
1306
1307 case R_NIOS2_IMM8:
1308 {
1309 Elf32_Addr word;
1310
1311 if (v > 0xff) {
1312 ret = obj_reloc_overflow;
1313 }
1314
1315 word = *loc & ~0x3fc0;
1316 *loc = word | ((v & 0xff) << 6);
1317 }
1318 break;
1319
1320 case R_NIOS2_HI16:
1321 {
1322 Elf32_Addr word;
1323
1324 word = *loc;
1325 *loc = ((((word >> 22) << 16) | ((v >>16) & 0xffff)) << 6) |
1326 (word & 0x3f);
1327 }
1328 break;
1329
1330 case R_NIOS2_LO16:
1331 {
1332 Elf32_Addr word;
1333
1334 word = *loc;
1335 *loc = ((((word >> 22) << 16) | (v & 0xffff)) << 6) |
1336 (word & 0x3f);
1337 }
1338 break;
1339
1340 case R_NIOS2_HIADJ16:
1341 {
1342 Elf32_Addr word1, word2;
1343
1344 word1 = *loc;
1345 word2 = ((v >> 16) + ((v >> 15) & 1)) & 0xffff;
1346 *loc = ((((word1 >> 22) << 16) | word2) << 6) |
1347 (word1 & 0x3f);
1348 }
1349 break;
1350
1351 #elif defined(__powerpc64__)
1352 /* PPC64 needs a 2.6 kernel, 2.4 module relocation irrelevant */
1353
1354 #elif defined(__powerpc__)
1355
1356 case R_PPC_ADDR16_HA:
1357 *(unsigned short *)loc = (v + 0x8000) >> 16;
1358 break;
1359
1360 case R_PPC_ADDR16_HI:
1361 *(unsigned short *)loc = v >> 16;
1362 break;
1363
1364 case R_PPC_ADDR16_LO:
1365 *(unsigned short *)loc = v;
1366 break;
1367
1368 case R_PPC_REL24:
1369 goto bb_use_plt;
1370
1371 case R_PPC_REL32:
1372 *loc = v - dot;
1373 break;
1374
1375 case R_PPC_ADDR32:
1376 *loc = v;
1377 break;
1378
1379 #elif defined(__s390__)
1380
1381 case R_390_32:
1382 *(unsigned int *) loc += v;
1383 break;
1384 case R_390_16:
1385 *(unsigned short *) loc += v;
1386 break;
1387 case R_390_8:
1388 *(unsigned char *) loc += v;
1389 break;
1390
1391 case R_390_PC32:
1392 *(unsigned int *) loc += v - dot;
1393 break;
1394 case R_390_PC16DBL:
1395 *(unsigned short *) loc += (v - dot) >> 1;
1396 break;
1397 case R_390_PC16:
1398 *(unsigned short *) loc += v - dot;
1399 break;
1400
1401 case R_390_PLT32:
1402 case R_390_PLT16DBL:
1403 /* find the plt entry and initialize it. */
1404 pe = (struct arch_single_entry *) &isym->pltent;
1405 if (pe->inited == 0) {
1406 ip = (unsigned long *)(ifile->plt->contents + pe->offset);
1407 ip[0] = 0x0d105810; /* basr 1,0; lg 1,10(1); br 1 */
1408 ip[1] = 0x100607f1;
1409 if (ELF_R_TYPE(rel->r_info) == R_390_PLT16DBL)
1410 ip[2] = v - 2;
1411 else
1412 ip[2] = v;
1413 pe->inited = 1;
1414 }
1415
1416 /* Insert relative distance to target. */
1417 v = plt + pe->offset - dot;
1418 if (ELF_R_TYPE(rel->r_info) == R_390_PLT32)
1419 *(unsigned int *) loc = (unsigned int) v;
1420 else if (ELF_R_TYPE(rel->r_info) == R_390_PLT16DBL)
1421 *(unsigned short *) loc = (unsigned short) ((v + 2) >> 1);
1422 break;
1423
1424 case R_390_GLOB_DAT:
1425 case R_390_JMP_SLOT:
1426 *loc = v;
1427 break;
1428
1429 case R_390_RELATIVE:
1430 *loc += f->baseaddr;
1431 break;
1432
1433 case R_390_GOTPC:
1434 *(unsigned long *) loc += got - dot;
1435 break;
1436
1437 case R_390_GOT12:
1438 case R_390_GOT16:
1439 case R_390_GOT32:
1440 if (!isym->gotent.inited)
1441 {
1442 isym->gotent.inited = 1;
1443 *(ElfW(Addr) *)(ifile->got->contents + isym->gotent.offset) = v;
1444 }
1445 if (ELF_R_TYPE(rel->r_info) == R_390_GOT12)
1446 *(unsigned short *) loc |= (*(unsigned short *) loc + isym->gotent.offset) & 0xfff;
1447 else if (ELF_R_TYPE(rel->r_info) == R_390_GOT16)
1448 *(unsigned short *) loc += isym->gotent.offset;
1449 else if (ELF_R_TYPE(rel->r_info) == R_390_GOT32)
1450 *(unsigned int *) loc += isym->gotent.offset;
1451 break;
1452
1453 # ifndef R_390_GOTOFF32
1454 # define R_390_GOTOFF32 R_390_GOTOFF
1455 # endif
1456 case R_390_GOTOFF32:
1457 *loc += v - got;
1458 break;
1459
1460 #elif defined(__sh__)
1461
1462 case R_SH_NONE:
1463 break;
1464
1465 case R_SH_DIR32:
1466 *loc += v;
1467 break;
1468
1469 case R_SH_REL32:
1470 *loc += v - dot;
1471 break;
1472
1473 case R_SH_PLT32:
1474 *loc = v - dot;
1475 break;
1476
1477 case R_SH_GLOB_DAT:
1478 case R_SH_JMP_SLOT:
1479 *loc = v;
1480 break;
1481
1482 case R_SH_RELATIVE:
1483 *loc = f->baseaddr + rel->r_addend;
1484 break;
1485
1486 case R_SH_GOTPC:
1487 *loc = got - dot + rel->r_addend;
1488 break;
1489
1490 case R_SH_GOT32:
1491 goto bb_use_got;
1492
1493 case R_SH_GOTOFF:
1494 *loc = v - got;
1495 break;
1496
1497 # if defined(__SH5__)
1498 case R_SH_IMM_MEDLOW16:
1499 case R_SH_IMM_LOW16:
1500 {
1501 ElfW(Addr) word;
1502
1503 if (ELF_R_TYPE(rel->r_info) == R_SH_IMM_MEDLOW16)
1504 v >>= 16;
1505
1506 /*
1507 * movi and shori have the format:
1508 *
1509 * | op | imm | reg | reserved |
1510 * 31..26 25..10 9.. 4 3 .. 0
1511 *
1512 * so we simply mask and or in imm.
1513 */
1514 word = *loc & ~0x3fffc00;
1515 word |= (v & 0xffff) << 10;
1516
1517 *loc = word;
1518
1519 break;
1520 }
1521
1522 case R_SH_IMM_MEDLOW16_PCREL:
1523 case R_SH_IMM_LOW16_PCREL:
1524 {
1525 ElfW(Addr) word;
1526
1527 word = *loc & ~0x3fffc00;
1528
1529 v -= dot;
1530
1531 if (ELF_R_TYPE(rel->r_info) == R_SH_IMM_MEDLOW16_PCREL)
1532 v >>= 16;
1533
1534 word |= (v & 0xffff) << 10;
1535
1536 *loc = word;
1537
1538 break;
1539 }
1540 # endif /* __SH5__ */
1541
1542 #elif defined(__v850e__)
1543
1544 case R_V850_NONE:
1545 break;
1546
1547 case R_V850_32:
1548 /* We write two shorts instead of a long because even
1549 32-bit insns only need half-word alignment, but
1550 32-bit data needs to be long-word aligned. */
1551 v += ((unsigned short *)loc)[0];
1552 v += ((unsigned short *)loc)[1] << 16;
1553 ((unsigned short *)loc)[0] = v & 0xffff;
1554 ((unsigned short *)loc)[1] = (v >> 16) & 0xffff;
1555 break;
1556
1557 case R_V850_22_PCREL:
1558 goto bb_use_plt;
1559
1560 #elif defined(__x86_64__)
1561
1562 case R_X86_64_NONE:
1563 break;
1564
1565 case R_X86_64_64:
1566 *loc += v;
1567 break;
1568
1569 case R_X86_64_32:
1570 *(unsigned int *) loc += v;
1571 if (v > 0xffffffff)
1572 {
1573 ret = obj_reloc_overflow; /* Kernel module compiled without -mcmodel=kernel. */
1574 /* error("Possibly is module compiled without -mcmodel=kernel!"); */
1575 }
1576 break;
1577
1578 case R_X86_64_32S:
1579 *(signed int *) loc += v;
1580 break;
1581
1582 case R_X86_64_16:
1583 *(unsigned short *) loc += v;
1584 break;
1585
1586 case R_X86_64_8:
1587 *(unsigned char *) loc += v;
1588 break;
1589
1590 case R_X86_64_PC32:
1591 *(unsigned int *) loc += v - dot;
1592 break;
1593
1594 case R_X86_64_PC16:
1595 *(unsigned short *) loc += v - dot;
1596 break;
1597
1598 case R_X86_64_PC8:
1599 *(unsigned char *) loc += v - dot;
1600 break;
1601
1602 case R_X86_64_GLOB_DAT:
1603 case R_X86_64_JUMP_SLOT:
1604 *loc = v;
1605 break;
1606
1607 case R_X86_64_RELATIVE:
1608 *loc += f->baseaddr;
1609 break;
1610
1611 case R_X86_64_GOT32:
1612 case R_X86_64_GOTPCREL:
1613 goto bb_use_got;
1614 # if 0
1615 if (!isym->gotent.reloc_done)
1616 {
1617 isym->gotent.reloc_done = 1;
1618 *(Elf64_Addr *)(ifile->got->contents + isym->gotent.offset) = v;
1619 }
1620 /* XXX are these really correct? */
1621 if (ELF64_R_TYPE(rel->r_info) == R_X86_64_GOTPCREL)
1622 *(unsigned int *) loc += v + isym->gotent.offset;
1623 else
1624 *loc += isym->gotent.offset;
1625 break;
1626 # endif
1627
1628 #else
1629 # warning "no idea how to handle relocations on your arch"
1630 #endif
1631
1632 default:
1633 printf("Warning: unhandled reloc %d\n",(int)ELF_R_TYPE(rel->r_info));
1634 ret = obj_reloc_unhandled;
1635 break;
1636
1637 #if defined(USE_PLT_ENTRIES)
1638
1639 bb_use_plt:
1640
1641 /* find the plt entry and initialize it if necessary */
1642
1643 #if defined(USE_PLT_LIST)
1644 for (pe = isym->pltent; pe != NULL && pe->addend != rel->r_addend;)
1645 pe = pe->next;
1646 #else
1647 pe = &isym->pltent;
1648 #endif
1649
1650 if (! pe->inited) {
1651 ip = (unsigned long *) (ifile->plt->contents + pe->offset);
1652
1653 /* generate some machine code */
1654
1655 #if defined(__arm__)
1656 ip[0] = 0xe51ff004; /* ldr pc,[pc,#-4] */
1657 ip[1] = v; /* sym@ */
1658 #endif
1659 #if defined(__powerpc__)
1660 ip[0] = 0x3d600000 + ((v + 0x8000) >> 16); /* lis r11,sym@ha */
1661 ip[1] = 0x396b0000 + (v & 0xffff); /* addi r11,r11,sym@l */
1662 ip[2] = 0x7d6903a6; /* mtctr r11 */
1663 ip[3] = 0x4e800420; /* bctr */
1664 #endif
1665 #if defined(__v850e__)
1666 /* We have to trash a register, so we assume that any control
1667 transfer more than 21-bits away must be a function call
1668 (so we can use a call-clobbered register). */
1669 ip[0] = 0x0621 + ((v & 0xffff) << 16); /* mov sym, r1 ... */
1670 ip[1] = ((v >> 16) & 0xffff) + 0x610000; /* ...; jmp r1 */
1671 #endif
1672 pe->inited = 1;
1673 }
1674
1675 /* relative distance to target */
1676 v -= dot;
1677 /* if the target is too far away.... */
1678 #if defined(__arm__) || defined(__powerpc__)
1679 if ((int)v < -0x02000000 || (int)v >= 0x02000000)
1680 #elif defined(__v850e__)
1681 if ((ElfW(Sword))v > 0x1fffff || (ElfW(Sword))v < (ElfW(Sword))-0x200000)
1682 #endif
1683 /* go via the plt */
1684 v = plt + pe->offset - dot;
1685
1686 #if defined(__v850e__)
1687 if (v & 1)
1688 #else
1689 if (v & 3)
1690 #endif
1691 ret = obj_reloc_dangerous;
1692
1693 /* merge the offset into the instruction. */
1694 #if defined(__arm__)
1695 /* Convert to words. */
1696 v >>= 2;
1697
1698 *loc = (*loc & ~0x00ffffff) | ((v + *loc) & 0x00ffffff);
1699 #endif
1700 #if defined(__powerpc__)
1701 *loc = (*loc & ~0x03fffffc) | (v & 0x03fffffc);
1702 #endif
1703 #if defined(__v850e__)
1704 /* We write two shorts instead of a long because even 32-bit insns
1705 only need half-word alignment, but the 32-bit data write needs
1706 to be long-word aligned. */
1707 ((unsigned short *)loc)[0] =
1708 (*(unsigned short *)loc & 0xffc0) /* opcode + reg */
1709 | ((v >> 16) & 0x3f); /* offs high part */
1710 ((unsigned short *)loc)[1] =
1711 (v & 0xffff); /* offs low part */
1712 #endif
1713 break;
1714 #endif /* USE_PLT_ENTRIES */
1715
1716 #if defined(USE_GOT_ENTRIES)
1717 bb_use_got:
1718
1719 /* needs an entry in the .got: set it, once */
1720 if (!isym->gotent.inited) {
1721 isym->gotent.inited = 1;
1722 *(ElfW(Addr) *) (ifile->got->contents + isym->gotent.offset) = v;
1723 }
1724 /* make the reloc with_respect_to_.got */
1725 #if defined(__sh__)
1726 *loc += isym->gotent.offset + rel->r_addend;
1727 #elif defined(__i386__) || defined(__arm__) || defined(__mc68000__)
1728 *loc += isym->gotent.offset;
1729 #endif
1730 break;
1731
1732 #endif /* USE_GOT_ENTRIES */
1733 }
1734
1735 return ret;
1736 }
1737
1738
1739 #if defined(USE_LIST)
1740
1741 static int arch_list_add(ElfW(RelM) *rel, struct arch_list_entry **list,
1742 int offset, int size)
1743 {
1744 struct arch_list_entry *pe;
1745
1746 for (pe = *list; pe != NULL; pe = pe->next) {
1747 if (pe->addend == rel->r_addend) {
1748 break;
1749 }
1750 }
1751
1752 if (pe == NULL) {
1753 pe = xmalloc(sizeof(struct arch_list_entry));
1754 pe->next = *list;
1755 pe->addend = rel->r_addend;
1756 pe->offset = offset;
1757 pe->inited = 0;
1758 *list = pe;
1759 return size;
1760 }
1761 return 0;
1762 }
1763
1764 #endif
1765
1766 #if defined(USE_SINGLE)
1767
1768 static int arch_single_init(ElfW(RelM) *rel, struct arch_single_entry *single,
1769 int offset, int size)
1770 {
1771 if (single->allocated == 0) {
1772 single->allocated = 1;
1773 single->offset = offset;
1774 single->inited = 0;
1775 return size;
1776 }
1777 return 0;
1778 }
1779
1780 #endif
1781
1782 #if defined(USE_GOT_ENTRIES) || defined(USE_PLT_ENTRIES)
1783
1784 static struct obj_section *arch_xsect_init(struct obj_file *f, const char *name,
1785 int offset, int size)
1786 {
1787 struct obj_section *myrelsec = obj_find_section(f, name);
1788
1789 if (offset == 0) {
1790 offset += size;
1791 }
1792
1793 if (myrelsec) {
1794 obj_extend_section(myrelsec, offset);
1795 } else {
1796 myrelsec = obj_create_alloced_section(f, name,
1797 size, offset);
1798 }
1799
1800 return myrelsec;
1801 }
1802
1803 #endif
1804
1805 static void arch_create_got(struct obj_file *f)
1806 {
1807 #if defined(USE_GOT_ENTRIES) || defined(USE_PLT_ENTRIES)
1808 struct arch_file *ifile = (struct arch_file *) f;
1809 int i;
1810 #if defined(USE_GOT_ENTRIES)
1811 int got_offset = 0, got_needed = 0, got_allocate;
1812 #endif
1813 #if defined(USE_PLT_ENTRIES)
1814 int plt_offset = 0, plt_needed = 0, plt_allocate;
1815 #endif
1816 struct obj_section *relsec, *symsec, *strsec;
1817 ElfW(RelM) *rel, *relend;
1818 ElfW(Sym) *symtab, *extsym;
1819 const char *strtab, *name;
1820 struct arch_symbol *intsym;
1821
1822 for (i = 0; i < f->header.e_shnum; ++i) {
1823 relsec = f->sections[i];
1824 if (relsec->header.sh_type != SHT_RELM)
1825 continue;
1826
1827 symsec = f->sections[relsec->header.sh_link];
1828 strsec = f->sections[symsec->header.sh_link];
1829
1830 rel = (ElfW(RelM) *) relsec->contents;
1831 relend = rel + (relsec->header.sh_size / sizeof(ElfW(RelM)));
1832 symtab = (ElfW(Sym) *) symsec->contents;
1833 strtab = (const char *) strsec->contents;
1834
1835 for (; rel < relend; ++rel) {
1836 extsym = &symtab[ELF_R_SYM(rel->r_info)];
1837
1838 #if defined(USE_GOT_ENTRIES)
1839 got_allocate = 0;
1840 #endif
1841 #if defined(USE_PLT_ENTRIES)
1842 plt_allocate = 0;
1843 #endif
1844
1845 switch (ELF_R_TYPE(rel->r_info)) {
1846 #if defined(__arm__)
1847 case R_ARM_PC24:
1848 case R_ARM_PLT32:
1849 plt_allocate = 1;
1850 break;
1851
1852 case R_ARM_GOTOFF:
1853 case R_ARM_GOTPC:
1854 got_needed = 1;
1855 continue;
1856
1857 case R_ARM_GOT32:
1858 got_allocate = 1;
1859 break;
1860
1861 #elif defined(__i386__)
1862 case R_386_GOTPC:
1863 case R_386_GOTOFF:
1864 got_needed = 1;
1865 continue;
1866
1867 case R_386_GOT32:
1868 got_allocate = 1;
1869 break;
1870
1871 #elif defined(__powerpc__)
1872 case R_PPC_REL24:
1873 plt_allocate = 1;
1874 break;
1875
1876 #elif defined(__mc68000__)
1877 case R_68K_GOT32:
1878 got_allocate = 1;
1879 break;
1880
1881 #ifdef R_68K_GOTOFF
1882 case R_68K_GOTOFF:
1883 got_needed = 1;
1884 continue;
1885 #endif
1886
1887 #elif defined(__sh__)
1888 case R_SH_GOT32:
1889 got_allocate = 1;
1890 break;
1891
1892 case R_SH_GOTPC:
1893 case R_SH_GOTOFF:
1894 got_needed = 1;
1895 continue;
1896
1897 #elif defined(__v850e__)
1898 case R_V850_22_PCREL:
1899 plt_needed = 1;
1900 break;
1901
1902 #endif
1903 default:
1904 continue;
1905 }
1906
1907 if (extsym->st_name != 0) {
1908 name = strtab + extsym->st_name;
1909 } else {
1910 name = f->sections[extsym->st_shndx]->name;
1911 }
1912 intsym = (struct arch_symbol *) obj_find_symbol(f, name);
1913 #if defined(USE_GOT_ENTRIES)
1914 if (got_allocate) {
1915 got_offset += arch_single_init(
1916 rel, &intsym->gotent,
1917 got_offset, GOT_ENTRY_SIZE);
1918
1919 got_needed = 1;
1920 }
1921 #endif
1922 #if defined(USE_PLT_ENTRIES)
1923 if (plt_allocate) {
1924 #if defined(USE_PLT_LIST)
1925 plt_offset += arch_list_add(
1926 rel, &intsym->pltent,
1927 plt_offset, PLT_ENTRY_SIZE);
1928 #else
1929 plt_offset += arch_single_init(
1930 rel, &intsym->pltent,
1931 plt_offset, PLT_ENTRY_SIZE);
1932 #endif
1933 plt_needed = 1;
1934 }
1935 #endif
1936 }
1937 }
1938
1939 #if defined(USE_GOT_ENTRIES)
1940 if (got_needed) {
1941 ifile->got = arch_xsect_init(f, ".got", got_offset,
1942 GOT_ENTRY_SIZE);
1943 }
1944 #endif
1945
1946 #if defined(USE_PLT_ENTRIES)
1947 if (plt_needed) {
1948 ifile->plt = arch_xsect_init(f, ".plt", plt_offset,
1949 PLT_ENTRY_SIZE);
1950 }
1951 #endif
1952
1953 #endif /* defined(USE_GOT_ENTRIES) || defined(USE_PLT_ENTRIES) */
1954 }
1955
1956 /*======================================================================*/
1957
1958 /* Standard ELF hash function. */
1959 static unsigned long obj_elf_hash_n(const char *name, unsigned long n)
1960 {
1961 unsigned long h = 0;
1962 unsigned long g;
1963 unsigned char ch;
1964
1965 while (n > 0) {
1966 ch = *name++;
1967 h = (h << 4) + ch;
1968 if ((g = (h & 0xf0000000)) != 0) {
1969 h ^= g >> 24;
1970 h &= ~g;
1971 }
1972 n--;
1973 }
1974 return h;
1975 }
1976
1977 static unsigned long obj_elf_hash(const char *name)
1978 {
1979 return obj_elf_hash_n(name, strlen(name));
1980 }
1981
1982 #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING
1983 /* String comparison for non-co-versioned kernel and module. */
1984
1985 static int ncv_strcmp(const char *a, const char *b)
1986 {
1987 size_t alen = strlen(a), blen = strlen(b);
1988
1989 if (blen == alen + 10 && b[alen] == '_' && b[alen + 1] == 'R')
1990 return strncmp(a, b, alen);
1991 else if (alen == blen + 10 && a[blen] == '_' && a[blen + 1] == 'R')
1992 return strncmp(a, b, blen);
1993 else
1994 return strcmp(a, b);
1995 }
1996
1997 /* String hashing for non-co-versioned kernel and module. Here
1998 we are simply forced to drop the crc from the hash. */
1999
2000 static unsigned long ncv_symbol_hash(const char *str)
2001 {
2002 size_t len = strlen(str);
2003 if (len > 10 && str[len - 10] == '_' && str[len - 9] == 'R')
2004 len -= 10;
2005 return obj_elf_hash_n(str, len);
2006 }
2007
2008 static void
2009 obj_set_symbol_compare(struct obj_file *f,
2010 int (*cmp) (const char *, const char *),
2011 unsigned long (*hash) (const char *))
2012 {
2013 if (cmp)
2014 f->symbol_cmp = cmp;
2015 if (hash) {
2016 struct obj_symbol *tmptab[HASH_BUCKETS], *sym, *next;
2017 int i;
2018
2019 f->symbol_hash = hash;
2020
2021 memcpy(tmptab, f->symtab, sizeof(tmptab));
2022 memset(f->symtab, 0, sizeof(f->symtab));
2023
2024 for (i = 0; i < HASH_BUCKETS; ++i)
2025 for (sym = tmptab[i]; sym; sym = next) {
2026 unsigned long h = hash(sym->name) % HASH_BUCKETS;
2027 next = sym->next;
2028 sym->next = f->symtab[h];
2029 f->symtab[h] = sym;
2030 }
2031 }
2032 }
2033
2034 #endif /* FEATURE_INSMOD_VERSION_CHECKING */
2035
2036 static struct obj_symbol *
2037 obj_add_symbol(struct obj_file *f, const char *name,
2038 unsigned long symidx, int info,
2039 int secidx, ElfW(Addr) value,
2040 unsigned long size)
2041 {
2042 struct obj_symbol *sym;
2043 unsigned long hash = f->symbol_hash(name) % HASH_BUCKETS;
2044 int n_type = ELF_ST_TYPE(info);
2045 int n_binding = ELF_ST_BIND(info);
2046
2047 for (sym = f->symtab[hash]; sym; sym = sym->next)
2048 if (f->symbol_cmp(sym->name, name) == 0) {
2049 int o_secidx = sym->secidx;
2050 int o_info = sym->info;
2051 int o_type = ELF_ST_TYPE(o_info);
2052 int o_binding = ELF_ST_BIND(o_info);
2053
2054 /* A redefinition! Is it legal? */
2055
2056 if (secidx == SHN_UNDEF)
2057 return sym;
2058 else if (o_secidx == SHN_UNDEF)
2059 goto found;
2060 else if (n_binding == STB_GLOBAL && o_binding == STB_LOCAL) {
2061 /* Cope with local and global symbols of the same name
2062 in the same object file, as might have been created
2063 by ld -r. The only reason locals are now seen at this
2064 level at all is so that we can do semi-sensible things
2065 with parameters. */
2066
2067 struct obj_symbol *nsym, **p;
2068
2069 nsym = arch_new_symbol();
2070 nsym->next = sym->next;
2071 nsym->ksymidx = -1;
2072
2073 /* Excise the old (local) symbol from the hash chain. */
2074 for (p = &f->symtab[hash]; *p != sym; p = &(*p)->next)
2075 continue;
2076 *p = sym = nsym;
2077 goto found;
2078 } else if (n_binding == STB_LOCAL) {
2079 /* Another symbol of the same name has already been defined.
2080 Just add this to the local table. */
2081 sym = arch_new_symbol();
2082 sym->next = NULL;
2083 sym->ksymidx = -1;
2084 f->local_symtab[symidx] = sym;
2085 goto found;
2086 } else if (n_binding == STB_WEAK)
2087 return sym;
2088 else if (o_binding == STB_WEAK)
2089 goto found;
2090 /* Don't unify COMMON symbols with object types the programmer
2091 doesn't expect. */
2092 else if (secidx == SHN_COMMON
2093 && (o_type == STT_NOTYPE || o_type == STT_OBJECT))
2094 return sym;
2095 else if (o_secidx == SHN_COMMON
2096 && (n_type == STT_NOTYPE || n_type == STT_OBJECT))
2097 goto found;
2098 else {
2099 /* Don't report an error if the symbol is coming from
2100 the kernel or some external module. */
2101 if (secidx <= SHN_HIRESERVE)
2102 bb_error_msg("%s multiply defined", name);
2103 return sym;
2104 }
2105 }
2106
2107 /* Completely new symbol. */
2108 sym = arch_new_symbol();
2109 sym->next = f->symtab[hash];
2110 f->symtab[hash] = sym;
2111 sym->ksymidx = -1;
2112
2113 if (ELF_ST_BIND(info) == STB_LOCAL && symidx != -1) {
2114 if (symidx >= f->local_symtab_size)
2115 bb_error_msg("local symbol %s with index %ld exceeds local_symtab_size %ld",
2116 name, (long) symidx, (long) f->local_symtab_size);
2117 else
2118 f->local_symtab[symidx] = sym;
2119 }
2120
2121 found:
2122 sym->name = name;
2123 sym->value = value;
2124 sym->size = size;
2125 sym->secidx = secidx;
2126 sym->info = info;
2127
2128 return sym;
2129 }
2130
2131 static struct obj_symbol *
2132 obj_find_symbol(struct obj_file *f, const char *name)
2133 {
2134 struct obj_symbol *sym;
2135 unsigned long hash = f->symbol_hash(name) % HASH_BUCKETS;
2136
2137 for (sym = f->symtab[hash]; sym; sym = sym->next)
2138 if (f->symbol_cmp(sym->name, name) == 0)
2139 return sym;
2140
2141 return NULL;
2142 }
2143
2144 static ElfW(Addr) obj_symbol_final_value(struct obj_file * f, struct obj_symbol * sym)
2145 {
2146 if (sym) {
2147 if (sym->secidx >= SHN_LORESERVE)
2148 return sym->value;
2149
2150 return sym->value + f->sections[sym->secidx]->header.sh_addr;
2151 } else {
2152 /* As a special case, a NULL sym has value zero. */
2153 return 0;
2154 }
2155 }
2156
2157 static struct obj_section *obj_find_section(struct obj_file *f, const char *name)
2158 {
2159 int i, n = f->header.e_shnum;
2160
2161 for (i = 0; i < n; ++i)
2162 if (strcmp(f->sections[i]->name, name) == 0)
2163 return f->sections[i];
2164
2165 return NULL;
2166 }
2167
2168 static int obj_load_order_prio(struct obj_section *a)
2169 {
2170 unsigned long af, ac;
2171
2172 af = a->header.sh_flags;
2173
2174 ac = 0;
2175 if (a->name[0] != '.' || strlen(a->name) != 10 ||
2176 strcmp(a->name + 5, ".init"))
2177 ac |= 32;
2178 if (af & SHF_ALLOC)
2179 ac |= 16;
2180 if (!(af & SHF_WRITE))
2181 ac |= 8;
2182 if (af & SHF_EXECINSTR)
2183 ac |= 4;
2184 if (a->header.sh_type != SHT_NOBITS)
2185 ac |= 2;
2186
2187 return ac;
2188 }
2189
2190 static void
2191 obj_insert_section_load_order(struct obj_file *f, struct obj_section *sec)
2192 {
2193 struct obj_section **p;
2194 int prio = obj_load_order_prio(sec);
2195 for (p = f->load_order_search_start; *p; p = &(*p)->load_next)
2196 if (obj_load_order_prio(*p) < prio)
2197 break;
2198 sec->load_next = *p;
2199 *p = sec;
2200 }
2201
2202 static struct obj_section *obj_create_alloced_section(struct obj_file *f,
2203 const char *name,
2204 unsigned long align,
2205 unsigned long size)
2206 {
2207 int newidx = f->header.e_shnum++;
2208 struct obj_section *sec;
2209
2210 f->sections = xrealloc(f->sections, (newidx + 1) * sizeof(sec));
2211 f->sections[newidx] = sec = arch_new_section();
2212
2213 memset(sec, 0, sizeof(*sec));
2214 sec->header.sh_type = SHT_PROGBITS;
2215 sec->header.sh_flags = SHF_WRITE | SHF_ALLOC;
2216 sec->header.sh_size = size;
2217 sec->header.sh_addralign = align;
2218 sec->name = name;
2219 sec->idx = newidx;
2220 if (size)
2221 sec->contents = xmalloc(size);
2222
2223 obj_insert_section_load_order(f, sec);
2224
2225 return sec;
2226 }
2227
2228 static struct obj_section *obj_create_alloced_section_first(struct obj_file *f,
2229 const char *name,
2230 unsigned long align,
2231 unsigned long size)
2232 {
2233 int newidx = f->header.e_shnum++;
2234 struct obj_section *sec;
2235
2236 f->sections = xrealloc(f->sections, (newidx + 1) * sizeof(sec));
2237 f->sections[newidx] = sec = arch_new_section();
2238
2239 memset(sec, 0, sizeof(*sec));
2240 sec->header.sh_type = SHT_PROGBITS;
2241 sec->header.sh_flags = SHF_WRITE | SHF_ALLOC;
2242 sec->header.sh_size = size;
2243 sec->header.sh_addralign = align;
2244 sec->name = name;
2245 sec->idx = newidx;
2246 if (size)
2247 sec->contents = xmalloc(size);
2248
2249 sec->load_next = f->load_order;
2250 f->load_order = sec;
2251 if (f->load_order_search_start == &f->load_order)
2252 f->load_order_search_start = &sec->load_next;
2253
2254 return sec;
2255 }
2256
2257 static void *obj_extend_section(struct obj_section *sec, unsigned long more)
2258 {
2259 unsigned long oldsize = sec->header.sh_size;
2260 if (more) {
2261 sec->contents = xrealloc(sec->contents, sec->header.sh_size += more);
2262 }
2263 return sec->contents + oldsize;
2264 }
2265
2266
2267 /* Conditionally add the symbols from the given symbol set to the
2268 new module. */
2269
2270 static int
2271 add_symbols_from( struct obj_file *f,
2272 int idx, struct new_module_symbol *syms, size_t nsyms)
2273 {
2274 struct new_module_symbol *s;
2275 size_t i;
2276 int used = 0;
2277 #ifdef SYMBOL_PREFIX
2278 char *name_buf = 0;
2279 size_t name_alloced_size = 0;
2280 #endif
2281 #if ENABLE_FEATURE_CHECK_TAINTED_MODULE
2282 int gpl;
2283
2284 gpl = obj_gpl_license(f, NULL) == 0;
2285 #endif
2286 for (i = 0, s = syms; i < nsyms; ++i, ++s) {
2287 /* Only add symbols that are already marked external.
2288 If we override locals we may cause problems for
2289 argument initialization. We will also create a false
2290 dependency on the module. */
2291 struct obj_symbol *sym;
2292 char *name;
2293
2294 /* GPL licensed modules can use symbols exported with
2295 * EXPORT_SYMBOL_GPL, so ignore any GPLONLY_ prefix on the
2296 * exported names. Non-GPL modules never see any GPLONLY_
2297 * symbols so they cannot fudge it by adding the prefix on
2298 * their references.
2299 */
2300 if (strncmp((char *)s->name, "GPLONLY_", 8) == 0) {
2301 #if ENABLE_FEATURE_CHECK_TAINTED_MODULE
2302 if (gpl)
2303 s->name += 8;
2304 else
2305 #endif
2306 continue;
2307 }
2308 name = (char *)s->name;
2309
2310 #ifdef SYMBOL_PREFIX
2311 /* Prepend SYMBOL_PREFIX to the symbol's name (the
2312 kernel exports `C names', but module object files
2313 reference `linker names'). */
2314 size_t extra = sizeof SYMBOL_PREFIX;
2315 size_t name_size = strlen(name) + extra;
2316 if (name_size > name_alloced_size) {
2317 name_alloced_size = name_size * 2;
2318 name_buf = alloca(name_alloced_size);
2319 }
2320 strcpy(name_buf, SYMBOL_PREFIX);
2321 strcpy(name_buf + extra - 1, name);
2322 name = name_buf;
2323 #endif /* SYMBOL_PREFIX */
2324
2325 sym = obj_find_symbol(f, name);
2326 if (sym && !(ELF_ST_BIND(sym->info) == STB_LOCAL)) {
2327 #ifdef SYMBOL_PREFIX
2328 /* Put NAME_BUF into more permanent storage. */
2329 name = xmalloc(name_size);
2330 strcpy(name, name_buf);
2331 #endif
2332 sym = obj_add_symbol(f, name, -1,
2333 ELF_ST_INFO(STB_GLOBAL,
2334 STT_NOTYPE),
2335 idx, s->value, 0);
2336 /* Did our symbol just get installed? If so, mark the
2337 module as "used". */
2338 if (sym->secidx == idx)
2339 used = 1;
2340 }
2341 }
2342
2343 return used;
2344 }
2345
2346 static void add_kernel_symbols(struct obj_file *f)
2347 {
2348 struct external_module *m;
2349 int i, nused = 0;
2350
2351 /* Add module symbols first. */
2352
2353 for (i = 0, m = ext_modules; i < n_ext_modules; ++i, ++m) {
2354 if (m->nsyms
2355 && add_symbols_from(f, SHN_HIRESERVE + 2 + i, m->syms, m->nsyms)
2356 ) {
2357 m->used = 1;
2358 ++nused;
2359 }
2360 }
2361
2362 n_ext_modules_used = nused;
2363
2364 /* And finally the symbols from the kernel proper. */
2365
2366 if (nksyms)
2367 add_symbols_from(f, SHN_HIRESERVE + 1, ksyms, nksyms);
2368 }
2369
2370 static char *get_modinfo_value(struct obj_file *f, const char *key)
2371 {
2372 struct obj_section *sec;
2373 char *p, *v, *n, *ep;
2374 size_t klen = strlen(key);
2375
2376 sec = obj_find_section(f, ".modinfo");
2377 if (sec == NULL)
2378 return NULL;
2379 p = sec->contents;
2380 ep = p + sec->header.sh_size;
2381 while (p < ep) {
2382 v = strchr(p, '=');
2383 n = strchr(p, '\0');
2384 if (v) {
2385 if (p + klen == v && strncmp(p, key, klen) == 0)
2386 return v + 1;
2387 } else {
2388 if (p + klen == n && strcmp(p, key) == 0)
2389 return n;
2390 }
2391 p = n + 1;
2392 }
2393
2394 return NULL;
2395 }
2396
2397
2398 /*======================================================================*/
2399 /* Functions relating to module loading after 2.1.18. */
2400
2401 static int
2402 new_process_module_arguments(struct obj_file *f, int argc, char **argv)
2403 {
2404 while (argc > 0) {
2405 char *p, *q, *key, *sym_name;
2406 struct obj_symbol *sym;
2407 char *contents, *loc;
2408 int min, max, n;
2409
2410 p = *argv;
2411 if ((q = strchr(p, '=')) == NULL) {
2412 argc--;
2413 continue;
2414 }
2415
2416 key = alloca(q - p + 6);
2417 memcpy(key, "parm_", 5);
2418 memcpy(key + 5, p, q - p);
2419 key[q - p + 5] = 0;
2420
2421 p = get_modinfo_value(f, key);
2422 key += 5;
2423 if (p == NULL) {
2424 bb_error_msg("invalid parameter %s", key);
2425 return 0;
2426 }
2427
2428 #ifdef SYMBOL_PREFIX
2429 sym_name = alloca(strlen(key) + sizeof SYMBOL_PREFIX);
2430 strcpy(sym_name, SYMBOL_PREFIX);
2431 strcat(sym_name, key);
2432 #else
2433 sym_name = key;
2434 #endif
2435 sym = obj_find_symbol(f, sym_name);
2436
2437 /* Also check that the parameter was not resolved from the kernel. */
2438 if (sym == NULL || sym->secidx > SHN_HIRESERVE) {
2439 bb_error_msg("symbol for parameter %s not found", key);
2440 return 0;
2441 }
2442
2443 if (isdigit(*p)) {
2444 min = strtoul(p, &p, 10);
2445 if (*p == '-')
2446 max = strtoul(p + 1, &p, 10);
2447 else
2448 max = min;
2449 } else
2450 min = max = 1;
2451
2452 contents = f->sections[sym->secidx]->contents;
2453 loc = contents + sym->value;
2454 n = (*++q != '\0');
2455
2456 while (1) {
2457 if ((*p == 's') || (*p == 'c')) {
2458 char *str;
2459
2460 /* Do C quoting if we begin with a ", else slurp the lot. */
2461 if (*q == '"') {
2462 char *r;
2463
2464 str = alloca(strlen(q));
2465 for (r = str, q++; *q != '"'; ++q, ++r) {
2466 if (*q == '\0') {
2467 bb_error_msg("improperly terminated string argument for %s",
2468 key);
2469 return 0;
2470 } else if (*q == '\\')
2471 switch (*++q) {
2472 case 'a':
2473 *r = '\a';
2474 break;
2475 case 'b':
2476 *r = '\b';
2477 break;
2478 case 'e':
2479 *r = '\033';
2480 break;
2481 case 'f':
2482 *r = '\f';
2483 break;
2484 case 'n':
2485 *r = '\n';
2486 break;
2487 case 'r':
2488 *r = '\r';
2489 break;
2490 case 't':
2491 *r = '\t';
2492 break;
2493
2494 case '0':
2495 case '1':
2496 case '2':
2497 case '3':
2498 case '4':
2499 case '5':
2500 case '6':
2501 case '7':
2502 {
2503 int c = *q - '0';
2504 if (q[1] >= '0' && q[1] <= '7') {
2505 c = (c * 8) + *++q - '0';
2506 if (q[1] >= '0' && q[1] <= '7')
2507 c = (c * 8) + *++q - '0';
2508 }
2509 *r = c;
2510 }
2511 break;
2512
2513 default:
2514 *r = *q;
2515 break;
2516 } else
2517 *r = *q;
2518 }
2519 *r = '\0';
2520 ++q;
2521 } else {
2522 char *r;
2523
2524 /* In this case, the string is not quoted. We will break
2525 it using the coma (like for ints). If the user wants to
2526 include comas in a string, he just has to quote it */
2527
2528 /* Search the next coma */
2529 r = strchr(q, ',');
2530
2531 /* Found ? */
2532 if (r != (char *) NULL) {
2533 /* Recopy the current field */
2534 str = alloca(r - q + 1);
2535 memcpy(str, q, r - q);
2536
2537 /* I don't know if it is useful, as the previous case
2538 doesn't nul terminate the string ??? */
2539 str[r - q] = '\0';
2540
2541 /* Keep next fields */
2542 q = r;
2543 } else {
2544 /* last string */
2545 str = q;
2546 q = (char*)"";
2547 }
2548 }
2549
2550 if (*p == 's') {
2551 /* Normal string */
2552 obj_string_patch(f, sym->secidx, loc - contents, str);
2553 loc += tgt_sizeof_char_p;
2554 } else {
2555 /* Array of chars (in fact, matrix!) */
2556 unsigned long charssize; /* size of each member */
2557
2558 /* Get the size of each member */
2559 /* Probably we should do that outside the loop ? */
2560 if (!isdigit(*(p + 1))) {
2561 bb_error_msg("parameter type 'c' for %s must be followed by"
2562 " the maximum size", key);
2563 return 0;
2564 }
2565 charssize = strtoul(p + 1, (char **) NULL, 10);
2566
2567 /* Check length */
2568 if (strlen(str) >= charssize) {
2569 bb_error_msg("string too long for %s (max %ld)", key,
2570 charssize - 1);
2571 return 0;
2572 }
2573
2574 /* Copy to location */
2575 strcpy((char *) loc, str);
2576 loc += charssize;
2577 }
2578 } else {
2579 long v = strtoul(q, &q, 0);
2580 switch (*p) {
2581 case 'b':
2582 *loc++ = v;
2583 break;
2584 case 'h':
2585 *(short *) loc = v;
2586 loc += tgt_sizeof_short;
2587 break;
2588 case 'i':
2589 *(int *) loc = v;
2590 loc += tgt_sizeof_int;
2591 break;
2592 case 'l':
2593 *(long *) loc = v;
2594 loc += tgt_sizeof_long;
2595 break;
2596
2597 default:
2598 bb_error_msg("unknown parameter type '%c' for %s", *p, key);
2599 return 0;
2600 }
2601 }
2602
2603 retry_end_of_value:
2604 switch (*q) {
2605 case '\0':
2606 goto end_of_arg;
2607
2608 case ' ':
2609 case '\t':
2610 case '\n':
2611 case '\r':
2612 ++q;
2613 goto retry_end_of_value;
2614
2615 case ',':
2616 if (++n > max) {
2617 bb_error_msg("too many values for %s (max %d)", key, max);
2618 return 0;
2619 }
2620 ++q;
2621 break;
2622
2623 default:
2624 bb_error_msg("invalid argument syntax for %s", key);
2625 return 0;
2626 }
2627 }
2628
2629 end_of_arg:
2630 if (n < min) {
2631 bb_error_msg("too few values for %s (min %d)", key, min);
2632 return 0;
2633 }
2634
2635 argc--, argv++;
2636 }
2637
2638 return 1;
2639 }
2640
2641 #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING
2642 static int new_is_module_checksummed(struct obj_file *f)
2643 {
2644 const char *p = get_modinfo_value(f, "using_checksums");
2645 if (p)
2646 return xatoi(p);
2647 else
2648 return 0;
2649 }
2650
2651 /* Get the module's kernel version in the canonical integer form. */
2652
2653 static int
2654 new_get_module_version(struct obj_file *f, char str[STRVERSIONLEN])
2655 {
2656 char *p, *q;
2657 int a, b, c;
2658
2659 p = get_modinfo_value(f, "kernel_version");
2660 if (p == NULL)
2661 return -1;
2662 safe_strncpy(str, p, STRVERSIONLEN);
2663
2664 a = strtoul(p, &p, 10);
2665 if (*p != '.')
2666 return -1;
2667 b = strtoul(p + 1, &p, 10);
2668 if (*p != '.')
2669 return -1;
2670 c = strtoul(p + 1, &q, 10);
2671 if (p + 1 == q)
2672 return -1;
2673
2674 return a << 16 | b << 8 | c;
2675 }
2676
2677 #endif /* FEATURE_INSMOD_VERSION_CHECKING */
2678
2679
2680 /* Fetch the loaded modules, and all currently exported symbols. */
2681
2682 static int new_get_kernel_symbols(void)
2683 {
2684 char *module_names, *mn;
2685 struct external_module *modules, *m;
2686 struct new_module_symbol *syms, *s;
2687 size_t ret, bufsize, nmod, nsyms, i, j;
2688
2689 /* Collect the loaded modules. */
2690
2691 module_names = xmalloc(bufsize = 256);
2692 retry_modules_load:
2693 if (query_module(NULL, QM_MODULES, module_names, bufsize, &ret)) {
2694 if (errno == ENOSPC && bufsize < ret) {
2695 module_names = xrealloc(module_names, bufsize = ret);
2696 goto retry_modules_load;
2697 }
2698 bb_perror_msg("QM_MODULES");
2699 return 0;
2700 }
2701
2702 n_ext_modules = nmod = ret;
2703
2704 /* Collect the modules' symbols. */
2705
2706 if (nmod) {
2707 ext_modules = modules = xmalloc(nmod * sizeof(*modules));
2708 memset(modules, 0, nmod * sizeof(*modules));
2709 for (i = 0, mn = module_names, m = modules;
2710 i < nmod; ++i, ++m, mn += strlen(mn) + 1) {
2711 struct new_module_info info;
2712
2713 if (query_module(mn, QM_INFO, &info, sizeof(info), &ret)) {
2714 if (errno == ENOENT) {
2715 /* The module was removed out from underneath us. */
2716 continue;
2717 }
2718 bb_perror_msg("query_module: QM_INFO: %s", mn);
2719 return 0;
2720 }
2721
2722 syms = xmalloc(bufsize = 1024);
2723 retry_mod_sym_load:
2724 if (query_module(mn, QM_SYMBOLS, syms, bufsize, &ret)) {
2725 switch (errno) {
2726 case ENOSPC:
2727 syms = xrealloc(syms, bufsize = ret);
2728 goto retry_mod_sym_load;
2729 case ENOENT:
2730 /* The module was removed out from underneath us. */
2731 continue;
2732 default:
2733 bb_perror_msg("query_module: QM_SYMBOLS: %s", mn);
2734 return 0;
2735 }
2736 }
2737 nsyms = ret;
2738
2739 m->name = mn;
2740 m->addr = info.addr;
2741 m->nsyms = nsyms;
2742 m->syms = syms;
2743
2744 for (j = 0, s = syms; j < nsyms; ++j, ++s) {
2745 s->name += (unsigned long) syms;
2746 }
2747 }
2748 }
2749
2750 /* Collect the kernel's symbols. */
2751
2752 syms = xmalloc(bufsize = 16 * 1024);
2753 retry_kern_sym_load:
2754 if (query_module(NULL, QM_SYMBOLS, syms, bufsize, &ret)) {
2755 if (errno == ENOSPC && bufsize < ret) {
2756 syms = xrealloc(syms, bufsize = ret);
2757 goto retry_kern_sym_load;
2758 }
2759 bb_perror_msg("kernel: QM_SYMBOLS");
2760 return 0;
2761 }
2762 nksyms = nsyms = ret;
2763 ksyms = syms;
2764
2765 for (j = 0, s = syms; j < nsyms; ++j, ++s) {
2766 s->name += (unsigned long) syms;
2767 }
2768 return 1;
2769 }
2770
2771
2772 /* Return the kernel symbol checksum version, or zero if not used. */
2773
2774 static int new_is_kernel_checksummed(void)
2775 {
2776 struct new_module_symbol *s;
2777 size_t i;
2778
2779 /* Using_Versions is not the first symbol, but it should be in there. */
2780
2781 for (i = 0, s = ksyms; i < nksyms; ++i, ++s)
2782 if (strcmp((char *) s->name, "Using_Versions") == 0)
2783 return s->value;
2784
2785 return 0;
2786 }
2787
2788
2789 static int new_create_this_module(struct obj_file *f, const char *m_name)
2790 {
2791 struct obj_section *sec;
2792
2793 sec = obj_create_alloced_section_first(f, ".this", tgt_sizeof_long,
2794 sizeof(struct new_module));
2795 memset(sec->contents, 0, sizeof(struct new_module));
2796
2797 obj_add_symbol(f, SPFX "__this_module", -1,
2798 ELF_ST_INFO(STB_LOCAL, STT_OBJECT), sec->idx, 0,
2799 sizeof(struct new_module));
2800
2801 obj_string_patch(f, sec->idx, offsetof(struct new_module, name),
2802 m_name);
2803
2804 return 1;
2805 }
2806
2807 #if ENABLE_FEATURE_INSMOD_KSYMOOPS_SYMBOLS
2808 /* add an entry to the __ksymtab section, creating it if necessary */
2809 static void new_add_ksymtab(struct obj_file *f, struct obj_symbol *sym)
2810 {
2811 struct obj_section *sec;
2812 ElfW(Addr) ofs;
2813
2814 /* ensure __ksymtab is allocated, EXPORT_NOSYMBOLS creates a non-alloc section.
2815 * If __ksymtab is defined but not marked alloc, x out the first character
2816 * (no obj_delete routine) and create a new __ksymtab with the correct
2817 * characteristics.
2818 */
2819 sec = obj_find_section(f, "__ksymtab");
2820 if (sec && !(sec->header.sh_flags & SHF_ALLOC)) {
2821 *((char *)(sec->name)) = 'x'; /* override const */
2822 sec = NULL;
2823 }
2824 if (!sec)
2825 sec = obj_create_alloced_section(f, "__ksymtab",
2826 tgt_sizeof_void_p, 0);
2827 if (!sec)
2828 return;
2829 sec->header.sh_flags |= SHF_ALLOC;
2830 /* Empty section might be byte-aligned */
2831 sec->header.sh_addralign = tgt_sizeof_void_p;
2832 ofs = sec->header.sh_size;
2833 obj_symbol_patch(f, sec->idx, ofs, sym);
2834 obj_string_patch(f, sec->idx, ofs + tgt_sizeof_void_p, sym->name);
2835 obj_extend_section(sec, 2 * tgt_sizeof_char_p);
2836 }
2837 #endif /* FEATURE_INSMOD_KSYMOOPS_SYMBOLS */
2838
2839 static int new_create_module_ksymtab(struct obj_file *f)
2840 {
2841 struct obj_section *sec;
2842 int i;
2843
2844 /* We must always add the module references. */
2845
2846 if (n_ext_modules_used) {
2847 struct new_module_ref *dep;
2848 struct obj_symbol *tm;
2849
2850 sec = obj_create_alloced_section(f, ".kmodtab", tgt_sizeof_void_p,
2851 (sizeof(struct new_module_ref)
2852 * n_ext_modules_used));
2853 if (!sec)
2854 return 0;
2855
2856 tm = obj_find_symbol(f, SPFX "__this_module");
2857 dep = (struct new_module_ref *) sec->contents;
2858 for (i = 0; i < n_ext_modules; ++i)
2859 if (ext_modules[i].used) {
2860 dep->dep = ext_modules[i].addr;
2861 obj_symbol_patch(f, sec->idx,
2862 (char *) &dep->ref - sec->contents, tm);
2863 dep->next_ref = 0;
2864 ++dep;
2865 }
2866 }
2867
2868 if (!flag_noexport && !obj_find_section(f, "__ksymtab")) {
2869 size_t nsyms;
2870 int *loaded;
2871
2872 sec = obj_create_alloced_section(f, "__ksymtab", tgt_sizeof_void_p, 0);
2873
2874 /* We don't want to export symbols residing in sections that
2875 aren't loaded. There are a number of these created so that
2876 we make sure certain module options don't appear twice. */
2877
2878 loaded = alloca(sizeof(int) * (i = f->header.e_shnum));
2879 while (--i >= 0)
2880 loaded[i] = (f->sections[i]->header.sh_flags & SHF_ALLOC) != 0;
2881
2882 for (nsyms = i = 0; i < HASH_BUCKETS; ++i) {
2883 struct obj_symbol *sym;
2884 for (sym = f->symtab[i]; sym; sym = sym->next)
2885 if (ELF_ST_BIND(sym->info) != STB_LOCAL
2886 && sym->secidx <= SHN_HIRESERVE
2887 && (sym->secidx >= SHN_LORESERVE
2888 || loaded[sym->secidx])) {
2889 ElfW(Addr) ofs = nsyms * 2 * tgt_sizeof_void_p;
2890
2891 obj_symbol_patch(f, sec->idx, ofs, sym);
2892 obj_string_patch(f, sec->idx, ofs + tgt_sizeof_void_p,
2893 sym->name);
2894
2895 nsyms++;
2896 }
2897 }
2898
2899 obj_extend_section(sec, nsyms * 2 * tgt_sizeof_char_p);
2900 }
2901
2902 return 1;
2903 }
2904
2905
2906 static int
2907 new_init_module(const char *m_name, struct obj_file *f, unsigned long m_size)
2908 {
2909 struct new_module *module;
2910 struct obj_section *sec;
2911 void *image;
2912 int ret;
2913 tgt_long m_addr;
2914
2915 sec = obj_find_section(f, ".this");
2916 if (!sec || !sec->contents) {
2917 bb_perror_msg_and_die("corrupt module %s?",m_name);
2918 }
2919 module = (struct new_module *) sec->contents;
2920 m_addr = sec->header.sh_addr;
2921
2922 module->size_of_struct = sizeof(*module);
2923 module->size = m_size;
2924 module->flags = flag_autoclean ? NEW_MOD_AUTOCLEAN : 0;
2925
2926 sec = obj_find_section(f, "__ksymtab");
2927 if (sec && sec->header.sh_size) {
2928 module->syms = sec->header.sh_addr;
2929 module->nsyms = sec->header.sh_size / (2 * tgt_sizeof_char_p);
2930 }
2931
2932 if (n_ext_modules_used) {
2933 sec = obj_find_section(f, ".kmodtab");
2934 module->deps = sec->header.sh_addr;
2935 module->ndeps = n_ext_modules_used;
2936 }
2937
2938 module->init =
2939 obj_symbol_final_value(f, obj_find_symbol(f, SPFX "init_module"));
2940 module->cleanup =
2941 obj_symbol_final_value(f, obj_find_symbol(f, SPFX "cleanup_module"));
2942
2943 sec = obj_find_section(f, "__ex_table");
2944 if (sec) {
2945 module->ex_table_start = sec->header.sh_addr;
2946 module->ex_table_end = sec->header.sh_addr + sec->header.sh_size;
2947 }
2948
2949 sec = obj_find_section(f, ".text.init");
2950 if (sec) {
2951 module->runsize = sec->header.sh_addr - m_addr;
2952 }
2953 sec = obj_find_section(f, ".data.init");
2954 if (sec) {
2955 if (!module->runsize ||
2956 module->runsize > sec->header.sh_addr - m_addr)
2957 module->runsize = sec->header.sh_addr - m_addr;
2958 }
2959 sec = obj_find_section(f, ARCHDATA_SEC_NAME);
2960 if (sec && sec->header.sh_size) {
2961 module->archdata_start = (void*)sec->header.sh_addr;
2962 module->archdata_end = module->archdata_start + sec->header.sh_size;
2963 }
2964 sec = obj_find_section(f, KALLSYMS_SEC_NAME);
2965 if (sec && sec->header.sh_size) {
2966 module->kallsyms_start = (void*)sec->header.sh_addr;
2967 module->kallsyms_end = module->kallsyms_start + sec->header.sh_size;
2968 }
2969
2970 /* Whew! All of the initialization is complete. Collect the final
2971 module image and give it to the kernel. */
2972
2973 image = xmalloc(m_size);
2974 obj_create_image(f, image);
2975
2976 ret = init_module(m_name, (struct new_module *) image);
2977 if (ret)
2978 bb_perror_msg("init_module: %s", m_name);
2979
2980 free(image);
2981
2982 return ret == 0;
2983 }
2984
2985
2986 /*======================================================================*/
2987
2988 static int
2989 obj_string_patch(struct obj_file *f, int secidx, ElfW(Addr) offset,
2990 const char *string)
2991 {
2992 struct obj_string_patch *p;
2993 struct obj_section *strsec;
2994 size_t len = strlen(string) + 1;
2995 char *loc;
2996
2997 p = xmalloc(sizeof(*p));
2998 p->next = f->string_patches;
2999 p->reloc_secidx = secidx;
3000 p->reloc_offset = offset;
3001 f->string_patches = p;
3002
3003 strsec = obj_find_section(f, ".kstrtab");
3004 if (strsec == NULL) {
3005 strsec = obj_create_alloced_section(f, ".kstrtab", 1, len);
3006 p->string_offset = 0;
3007 loc = strsec->contents;
3008 } else {
3009 p->string_offset = strsec->header.sh_size;
3010 loc = obj_extend_section(strsec, len);
3011 }
3012 memcpy(loc, string, len);
3013
3014 return 1;
3015 }
3016
3017 static int
3018 obj_symbol_patch(struct obj_file *f, int secidx, ElfW(Addr) offset,
3019 struct obj_symbol *sym)
3020 {
3021 struct obj_symbol_patch *p;
3022
3023 p = xmalloc(sizeof(*p));
3024 p->next = f->symbol_patches;
3025 p->reloc_secidx = secidx;
3026 p->reloc_offset = offset;
3027 p->sym = sym;
3028 f->symbol_patches = p;
3029
3030 return 1;
3031 }
3032
3033 static int obj_check_undefineds(struct obj_file *f)
3034 {
3035 unsigned long i;
3036 int ret = 1;
3037
3038 for (i = 0; i < HASH_BUCKETS; ++i) {
3039 struct obj_symbol *sym;
3040 for (sym = f->symtab[i]; sym; sym = sym->next)
3041 if (sym->secidx == SHN_UNDEF) {
3042 if (ELF_ST_BIND(sym->info) == STB_WEAK) {
3043 sym->secidx = SHN_ABS;
3044 sym->value = 0;
3045 } else {
3046 if (!flag_quiet) {
3047 bb_error_msg("unresolved symbol %s", sym->name);
3048 }
3049 ret = 0;
3050 }
3051 }
3052 }
3053
3054 return ret;
3055 }
3056
3057 static void obj_allocate_commons(struct obj_file *f)
3058 {
3059 struct common_entry {
3060 struct common_entry *next;
3061 struct obj_symbol *sym;
3062 } *common_head = NULL;
3063
3064 unsigned long i;
3065
3066 for (i = 0; i < HASH_BUCKETS; ++i) {
3067 struct obj_symbol *sym;
3068 for (sym = f->symtab[i]; sym; sym = sym->next)
3069 if (sym->secidx == SHN_COMMON) {
3070 /* Collect all COMMON symbols and sort them by size so as to
3071 minimize space wasted by alignment requirements. */
3072 {
3073 struct common_entry **p, *n;
3074 for (p = &common_head; *p; p = &(*p)->next)
3075 if (sym->size <= (*p)->sym->size)
3076 break;
3077
3078 n = alloca(sizeof(*n));
3079 n->next = *p;
3080 n->sym = sym;
3081 *p = n;
3082 }
3083 }
3084 }
3085
3086 for (i = 1; i < f->local_symtab_size; ++i) {
3087 struct obj_symbol *sym = f->local_symtab[i];
3088 if (sym && sym->secidx == SHN_COMMON) {
3089 struct common_entry **p, *n;
3090 for (p = &common_head; *p; p = &(*p)->next)
3091 if (sym == (*p)->sym)
3092 break;
3093 else if (sym->size < (*p)->sym->size) {
3094 n = alloca(sizeof(*n));
3095 n->next = *p;
3096 n->sym = sym;
3097 *p = n;
3098 break;
3099 }
3100 }
3101 }
3102
3103 if (common_head) {
3104 /* Find the bss section. */
3105 for (i = 0; i < f->header.e_shnum; ++i)
3106 if (f->sections[i]->header.sh_type == SHT_NOBITS)
3107 break;
3108
3109 /* If for some reason there hadn't been one, create one. */
3110 if (i == f->header.e_shnum) {
3111 struct obj_section *sec;
3112
3113 f->sections = xrealloc(f->sections, (i + 1) * sizeof(sec));
3114 f->sections[i] = sec = arch_new_section();
3115 f->header.e_shnum = i + 1;
3116
3117 memset(sec, 0, sizeof(*sec));
3118 sec->header.sh_type = SHT_PROGBITS;
3119 sec->header.sh_flags = SHF_WRITE | SHF_ALLOC;
3120 sec->name = ".bss";
3121 sec->idx = i;
3122 }
3123
3124 /* Allocate the COMMONS. */
3125 {
3126 ElfW(Addr) bss_size = f->sections[i]->header.sh_size;
3127 ElfW(Addr) max_align = f->sections[i]->header.sh_addralign;
3128 struct common_entry *c;
3129
3130 for (c = common_head; c; c = c->next) {
3131 ElfW(Addr) align = c->sym->value;
3132
3133 if (align > max_align)
3134 max_align = align;
3135 if (bss_size & (align - 1))
3136 bss_size = (bss_size | (align - 1)) + 1;
3137
3138 c->sym->secidx = i;
3139 c->sym->value = bss_size;
3140
3141 bss_size += c->sym->size;
3142 }
3143
3144 f->sections[i]->header.sh_size = bss_size;
3145 f->sections[i]->header.sh_addralign = max_align;
3146 }
3147 }
3148
3149 /* For the sake of patch relocation and parameter initialization,
3150 allocate zeroed data for NOBITS sections now. Note that after
3151 this we cannot assume NOBITS are really empty. */
3152 for (i = 0; i < f->header.e_shnum; ++i) {
3153 struct obj_section *s = f->sections[i];
3154 if (s->header.sh_type == SHT_NOBITS) {
3155 if (s->header.sh_size != 0)
3156 s->contents = memset(xmalloc(s->header.sh_size),
3157 0, s->header.sh_size);
3158 else
3159 s->contents = NULL;
3160
3161 s->header.sh_type = SHT_PROGBITS;
3162 }
3163 }
3164 }
3165
3166 static unsigned long obj_load_size(struct obj_file *f)
3167 {
3168 unsigned long dot = 0;
3169 struct obj_section *sec;
3170
3171 /* Finalize the positions of the sections relative to one another. */
3172
3173 for (sec = f->load_order; sec; sec = sec->load_next) {
3174 ElfW(Addr) align;
3175
3176 align = sec->header.sh_addralign;
3177 if (align && (dot & (align - 1)))
3178 dot = (dot | (align - 1)) + 1;
3179
3180 sec->header.sh_addr = dot;
3181 dot += sec->header.sh_size;
3182 }
3183
3184 return dot;
3185 }
3186
3187 static int obj_relocate(struct obj_file *f, ElfW(Addr) base)
3188 {
3189 int i, n = f->header.e_shnum;
3190 int ret = 1;
3191
3192 /* Finalize the addresses of the sections. */
3193
3194 f->baseaddr = base;
3195 for (i = 0; i < n; ++i)
3196 f->sections[i]->header.sh_addr += base;
3197
3198 /* And iterate over all of the relocations. */
3199
3200 for (i = 0; i < n; ++i) {
3201 struct obj_section *relsec, *symsec, *targsec, *strsec;
3202 ElfW(RelM) * rel, *relend;
3203 ElfW(Sym) * symtab;
3204 const char *strtab;
3205
3206 relsec = f->sections[i];
3207 if (relsec->header.sh_type != SHT_RELM)
3208 continue;
3209
3210 symsec = f->sections[relsec->header.sh_link];
3211 targsec = f->sections[relsec->header.sh_info];
3212 strsec = f->sections[symsec->header.sh_link];
3213
3214 rel = (ElfW(RelM) *) relsec->contents;
3215 relend = rel + (relsec->header.sh_size / sizeof(ElfW(RelM)));
3216 symtab = (ElfW(Sym) *) symsec->contents;
3217 strtab = (const char *) strsec->contents;
3218
3219 for (; rel < relend; ++rel) {
3220 ElfW(Addr) value = 0;
3221 struct obj_symbol *intsym = NULL;
3222 unsigned long symndx;
3223 ElfW(Sym) * extsym = 0;
3224 const char *errmsg;
3225
3226 /* Attempt to find a value to use for this relocation. */
3227
3228 symndx = ELF_R_SYM(rel->r_info);
3229 if (symndx) {
3230 /* Note we've already checked for undefined symbols. */
3231
3232 extsym = &symtab[symndx];
3233 if (ELF_ST_BIND(extsym->st_info) == STB_LOCAL) {
3234 /* Local symbols we look up in the local table to be sure
3235 we get the one that is really intended. */
3236 intsym = f->local_symtab[symndx];
3237 } else {
3238 /* Others we look up in the hash table. */
3239 const char *name;
3240 if (extsym->st_name)
3241 name = strtab + extsym->st_name;
3242 else
3243 name = f->sections[extsym->st_shndx]->name;
3244 intsym = obj_find_symbol(f, name);
3245 }
3246
3247 value = obj_symbol_final_value(f, intsym);
3248 intsym->referenced = 1;
3249 }
3250 #if SHT_RELM == SHT_RELA
3251 #if defined(__alpha__) && defined(AXP_BROKEN_GAS)
3252 /* Work around a nasty GAS bug, that is fixed as of 2.7.0.9. */
3253 if (!extsym || !extsym->st_name ||
3254 ELF_ST_BIND(extsym->st_info) != STB_LOCAL)
3255 #endif
3256 value += rel->r_addend;
3257 #endif
3258
3259 /* Do it! */
3260 switch (arch_apply_relocation
3261 (f, targsec, symsec, intsym, rel, value)
3262 ) {
3263 case obj_reloc_ok:
3264 break;
3265
3266 case obj_reloc_overflow:
3267 errmsg = "Relocation overflow";
3268 goto bad_reloc;
3269 case obj_reloc_dangerous:
3270 errmsg = "Dangerous relocation";
3271 goto bad_reloc;
3272 case obj_reloc_unhandled:
3273 errmsg = "Unhandled relocation";
3274 bad_reloc:
3275 if (extsym) {
3276 bb_error_msg("%s of type %ld for %s", errmsg,
3277 (long) ELF_R_TYPE(rel->r_info),
3278 strtab + extsym->st_name);
3279 } else {
3280 bb_error_msg("%s of type %ld", errmsg,
3281 (long) ELF_R_TYPE(rel->r_info));
3282 }
3283 ret = 0;
3284 break;
3285 }
3286 }
3287 }
3288
3289 /* Finally, take care of the patches. */
3290
3291 if (f->string_patches) {
3292 struct obj_string_patch *p;
3293 struct obj_section *strsec;
3294 ElfW(Addr) strsec_base;
3295 strsec = obj_find_section(f, ".kstrtab");
3296 strsec_base = strsec->header.sh_addr;
3297
3298 for (p = f->string_patches; p; p = p->next) {
3299 struct obj_section *targsec = f->sections[p->reloc_secidx];
3300 *(ElfW(Addr) *) (targsec->contents + p->reloc_offset)
3301 = strsec_base + p->string_offset;
3302 }
3303 }
3304
3305 if (f->symbol_patches) {
3306 struct obj_symbol_patch *p;
3307
3308 for (p = f->symbol_patches; p; p = p->next) {
3309 struct obj_section *targsec = f->sections[p->reloc_secidx];
3310 *(ElfW(Addr) *) (targsec->contents + p->reloc_offset)
3311 = obj_symbol_final_value(f, p->sym);
3312 }
3313 }
3314
3315 return ret;
3316 }
3317
3318 static int obj_create_image(struct obj_file *f, char *image)
3319 {
3320 struct obj_section *sec;
3321 ElfW(Addr) base = f->baseaddr;
3322
3323 for (sec = f->load_order; sec; sec = sec->load_next) {
3324 char *secimg;
3325
3326 if (sec->contents == 0 || sec->header.sh_size == 0)
3327 continue;
3328
3329 secimg = image + (sec->header.sh_addr - base);
3330
3331 /* Note that we allocated data for NOBITS sections earlier. */
3332 memcpy(secimg, sec->contents, sec->header.sh_size);
3333 }
3334
3335 return 1;
3336 }
3337
3338 /*======================================================================*/
3339
3340 static struct obj_file *obj_load(FILE * fp, int loadprogbits)
3341 {
3342 struct obj_file *f;
3343 ElfW(Shdr) * section_headers;
3344 int shnum, i;
3345 char *shstrtab;
3346
3347 /* Read the file header. */
3348
3349 f = arch_new_file();
3350 memset(f, 0, sizeof(*f));
3351 f->symbol_cmp = strcmp;
3352 f->symbol_hash = obj_elf_hash;
3353 f->load_order_search_start = &f->load_order;
3354
3355 fseek(fp, 0, SEEK_SET);
3356 if (fread(&f->header, sizeof(f->header), 1, fp) != 1) {
3357 bb_perror_msg("error reading ELF header");
3358 return NULL;
3359 }
3360
3361 if (f->header.e_ident[EI_MAG0] != ELFMAG0
3362 || f->header.e_ident[EI_MAG1] != ELFMAG1
3363 || f->header.e_ident[EI_MAG2] != ELFMAG2
3364 || f->header.e_ident[EI_MAG3] != ELFMAG3) {
3365 bb_error_msg("not an ELF file");
3366 return NULL;
3367 }
3368 if (f->header.e_ident[EI_CLASS] != ELFCLASSM
3369 || f->header.e_ident[EI_DATA] != (BB_BIG_ENDIAN
3370 ? ELFDATA2MSB : ELFDATA2LSB)
3371 || f->header.e_ident[EI_VERSION] != EV_CURRENT
3372 || !MATCH_MACHINE(f->header.e_machine)) {
3373 bb_error_msg("ELF file not for this architecture");
3374 return NULL;
3375 }
3376 if (f->header.e_type != ET_REL) {
3377 bb_error_msg("ELF file not a relocatable object");
3378 return NULL;
3379 }
3380
3381 /* Read the section headers. */
3382
3383 if (f->header.e_shentsize != sizeof(ElfW(Shdr))) {
3384 bb_error_msg("section header size mismatch: %lu != %lu",
3385 (unsigned long) f->header.e_shentsize,
3386 (unsigned long) sizeof(ElfW(Shdr)));
3387 return NULL;
3388 }
3389
3390 shnum = f->header.e_shnum;
3391 f->sections = xmalloc(sizeof(struct obj_section *) * shnum);
3392 memset(f->sections, 0, sizeof(struct obj_section *) * shnum);
3393
3394 section_headers = alloca(sizeof(ElfW(Shdr)) * shnum);
3395 fseek(fp, f->header.e_shoff, SEEK_SET);
3396 if (fread(section_headers, sizeof(ElfW(Shdr)), shnum, fp) != shnum) {
3397 bb_perror_msg("error reading ELF section headers");
3398 return NULL;
3399 }
3400
3401 /* Read the section data. */
3402
3403 for (i = 0; i < shnum; ++i) {
3404 struct obj_section *sec;
3405
3406 f->sections[i] = sec = arch_new_section();
3407 memset(sec, 0, sizeof(*sec));
3408
3409 sec->header = section_headers[i];
3410 sec->idx = i;
3411
3412 if (sec->header.sh_size) {
3413 switch (sec->header.sh_type) {
3414 case SHT_NULL:
3415 case SHT_NOTE:
3416 case SHT_NOBITS:
3417 /* ignore */
3418 break;
3419
3420 case SHT_PROGBITS:
3421 #if LOADBITS
3422 if (!loadprogbits) {
3423 sec->contents = NULL;
3424 break;
3425 }
3426 #endif
3427 case SHT_SYMTAB:
3428 case SHT_STRTAB:
3429 case SHT_RELM:
3430 if (sec->header.sh_size > 0) {
3431 sec->contents = xmalloc(sec->header.sh_size);
3432 fseek(fp, sec->header.sh_offset, SEEK_SET);
3433 if (fread(sec->contents, sec->header.sh_size, 1, fp) != 1) {
3434 bb_perror_msg("error reading ELF section data");
3435 return NULL;
3436 }
3437 } else {
3438 sec->contents = NULL;
3439 }
3440 break;
3441
3442 #if SHT_RELM == SHT_REL
3443 case SHT_RELA:
3444 bb_error_msg("RELA relocations not supported on this architecture");
3445 return NULL;
3446 #else
3447 case SHT_REL:
3448 bb_error_msg("REL relocations not supported on this architecture");
3449 return NULL;
3450 #endif
3451
3452 default:
3453 if (sec->header.sh_type >= SHT_LOPROC) {
3454 /* Assume processor specific section types are debug
3455 info and can safely be ignored. If this is ever not
3456 the case (Hello MIPS?), don't put ifdefs here but
3457 create an arch_load_proc_section(). */
3458 break;
3459 }
3460
3461 bb_error_msg("can't handle sections of type %ld",
3462 (long) sec->header.sh_type);
3463 return NULL;
3464 }
3465 }
3466 }
3467
3468 /* Do what sort of interpretation as needed by each section. */
3469
3470 shstrtab = f->sections[f->header.e_shstrndx]->contents;
3471
3472 for (i = 0; i < shnum; ++i) {
3473 struct obj_section *sec = f->sections[i];
3474 sec->name = shstrtab + sec->header.sh_name;
3475 }
3476
3477 for (i = 0; i < shnum; ++i) {
3478 struct obj_section *sec = f->sections[i];
3479
3480 /* .modinfo should be contents only but gcc has no attribute for that.
3481 * The kernel may have marked .modinfo as ALLOC, ignore this bit.
3482 */
3483 if (strcmp(sec->name, ".modinfo") == 0)
3484 sec->header.sh_flags &= ~SHF_ALLOC;
3485
3486 if (sec->header.sh_flags & SHF_ALLOC)
3487 obj_insert_section_load_order(f, sec);
3488
3489 switch (sec->header.sh_type) {
3490 case SHT_SYMTAB:
3491 {
3492 unsigned long nsym, j;
3493 char *strtab;
3494 ElfW(Sym) * sym;
3495
3496 if (sec->header.sh_entsize != sizeof(ElfW(Sym))) {
3497 bb_error_msg("symbol size mismatch: %lu != %lu",
3498 (unsigned long) sec->header.sh_entsize,
3499 (unsigned long) sizeof(ElfW(Sym)));
3500 return NULL;
3501 }
3502
3503 nsym = sec->header.sh_size / sizeof(ElfW(Sym));
3504 strtab = f->sections[sec->header.sh_link]->contents;
3505 sym = (ElfW(Sym) *) sec->contents;
3506
3507 /* Allocate space for a table of local symbols. */
3508 j = f->local_symtab_size = sec->header.sh_info;
3509 f->local_symtab = xzalloc(j * sizeof(struct obj_symbol *));
3510
3511 /* Insert all symbols into the hash table. */
3512 for (j = 1, ++sym; j < nsym; ++j, ++sym) {
3513 ElfW(Addr) val = sym->st_value;
3514 const char *name;
3515 if (sym->st_name)
3516 name = strtab + sym->st_name;
3517 else if (sym->st_shndx < shnum)
3518 name = f->sections[sym->st_shndx]->name;
3519 else
3520 continue;
3521 #if defined(__SH5__)
3522 /*
3523 * For sh64 it is possible that the target of a branch
3524 * requires a mode switch (32 to 16 and back again).
3525 *
3526 * This is implied by the lsb being set in the target
3527 * address for SHmedia mode and clear for SHcompact.
3528 */
3529 val |= sym->st_other & 4;
3530 #endif
3531
3532 obj_add_symbol(f, name, j, sym->st_info, sym->st_shndx,
3533 val, sym->st_size);
3534 }
3535 }
3536 break;
3537
3538 case SHT_RELM:
3539 if (sec->header.sh_entsize != sizeof(ElfW(RelM))) {
3540 bb_error_msg("relocation entry size mismatch: %lu != %lu",
3541 (unsigned long) sec->header.sh_entsize,
3542 (unsigned long) sizeof(ElfW(RelM)));
3543 return NULL;
3544 }
3545 break;
3546 /* XXX Relocation code from modutils-2.3.19 is not here.
3547 * Why? That's about 20 lines of code from obj/obj_load.c,
3548 * which gets done in a second pass through the sections.
3549 * This BusyBox insmod does similar work in obj_relocate(). */
3550 }
3551 }
3552
3553 return f;
3554 }
3555
3556 #if ENABLE_FEATURE_INSMOD_LOADINKMEM
3557 /*
3558 * load the unloaded sections directly into the memory allocated by
3559 * kernel for the module
3560 */
3561
3562 static int obj_load_progbits(FILE * fp, struct obj_file* f, char* imagebase)
3563 {
3564 ElfW(Addr) base = f->baseaddr;
3565 struct obj_section* sec;
3566
3567 for (sec = f->load_order; sec; sec = sec->load_next) {
3568
3569 /* section already loaded? */
3570 if (sec->contents != NULL)
3571 continue;
3572
3573 if (sec->header.sh_size == 0)
3574 continue;
3575
3576 sec->contents = imagebase + (sec->header.sh_addr - base);
3577 fseek(fp, sec->header.sh_offset, SEEK_SET);
3578 if (fread(sec->contents, sec->header.sh_size, 1, fp) != 1) {
3579 bb_perror_msg("error reading ELF section data");
3580 return 0;
3581 }
3582
3583 }
3584 return 1;
3585 }
3586 #endif
3587
3588 static void hide_special_symbols(struct obj_file *f)
3589 {
3590 static const char *const specials[] = {
3591 SPFX "cleanup_module",
3592 SPFX "init_module",
3593 SPFX "kernel_version",
3594 NULL
3595 };
3596
3597 struct obj_symbol *sym;
3598 const char *const *p;
3599
3600 for (p = specials; *p; ++p) {
3601 sym = obj_find_symbol(f, *p);
3602 if (sym != NULL)
3603 sym->info = ELF_ST_INFO(STB_LOCAL, ELF_ST_TYPE(sym->info));
3604 }
3605 }
3606
3607
3608 #if ENABLE_FEATURE_CHECK_TAINTED_MODULE
3609 static int obj_gpl_license(struct obj_file *f, const char **license)
3610 {
3611 struct obj_section *sec;
3612 /* This list must match *exactly* the list of allowable licenses in
3613 * linux/include/linux/module.h. Checking for leading "GPL" will not
3614 * work, somebody will use "GPL sucks, this is proprietary".
3615 */
3616 static const char *const gpl_licenses[] = {
3617 "GPL",
3618 "GPL v2",
3619 "GPL and additional rights",
3620 "Dual BSD/GPL",
3621 "Dual MPL/GPL"
3622 };
3623
3624 sec = obj_find_section(f, ".modinfo");
3625 if (sec) {
3626 const char *value, *ptr, *endptr;
3627 ptr = sec->contents;
3628 endptr = ptr + sec->header.sh_size;
3629 while (ptr < endptr) {
3630 value = strchr(ptr, '=');
3631 if (value && strncmp(ptr, "license", value-ptr) == 0) {
3632 int i;
3633 if (license)
3634 *license = value+1;
3635 for (i = 0; i < ARRAY_SIZE(gpl_licenses); ++i) {
3636 if (strcmp(value+1, gpl_licenses[i]) == 0)
3637 return 0;
3638 }
3639 return 2;
3640 }
3641 if (strchr(ptr, '\0'))
3642 ptr = strchr(ptr, '\0') + 1;
3643 else
3644 ptr = endptr;
3645 }
3646 }
3647 return 1;
3648 }
3649
3650 #define TAINT_FILENAME "/proc/sys/kernel/tainted"
3651 #define TAINT_PROPRIETORY_MODULE (1<<0)
3652 #define TAINT_FORCED_MODULE (1<<1)
3653 #define TAINT_UNSAFE_SMP (1<<2)
3654 #define TAINT_URL "http://www.tux.org/lkml/#export-tainted"
3655
3656 static void set_tainted(struct obj_file *f, int fd, char *m_name,
3657 int kernel_has_tainted, int taint, const char *text1, const char *text2)
3658 {
3659 static smallint printed_info;
3660
3661 char buf[80];
3662 int oldval;
3663
3664 if (fd < 0 && !kernel_has_tainted)
3665 return; /* New modutils on old kernel */
3666 printf("Warning: loading %s will taint the kernel: %s%s\n",
3667 m_name, text1, text2);
3668 if (!printed_info) {
3669 printf(" See %s for information about tainted modules\n", TAINT_URL);
3670 printed_info = 1;
3671 }
3672 if (fd >= 0) {
3673 read(fd, buf, sizeof(buf)-1);
3674 buf[sizeof(buf)-1] = '\0';
3675 oldval = strtoul(buf, NULL, 10);
3676 sprintf(buf, "%d\n", oldval | taint);
3677 write(fd, buf, strlen(buf));
3678 }
3679 }
3680
3681 /* Check if loading this module will taint the kernel. */
3682 static void check_tainted_module(struct obj_file *f, char *m_name)
3683 {
3684 static const char tainted_file[] ALIGN1 = TAINT_FILENAME;
3685
3686 int fd, kernel_has_tainted;
3687 const char *ptr;
3688
3689 kernel_has_tainted = 1;
3690 fd = open(tainted_file, O_RDWR);
3691 if (fd < 0) {
3692 if (errno == ENOENT)
3693 kernel_has_tainted = 0;
3694 else if (errno == EACCES)
3695 kernel_has_tainted = 1;
3696 else {
3697 perror(tainted_file);
3698 kernel_has_tainted = 0;
3699 }
3700 }
3701
3702 switch (obj_gpl_license(f, &ptr)) {
3703 case 0:
3704 break;
3705 case 1:
3706 set_tainted(f, fd, m_name, kernel_has_tainted, TAINT_PROPRIETORY_MODULE, "no license", "");
3707 break;
3708 case 2:
3709 /* The module has a non-GPL license so we pretend that the
3710 * kernel always has a taint flag to get a warning even on
3711 * kernels without the proc flag.
3712 */
3713 set_tainted(f, fd, m_name, 1, TAINT_PROPRIETORY_MODULE, "non-GPL license - ", ptr);
3714 break;
3715 default:
3716 set_tainted(f, fd, m_name, 1, TAINT_PROPRIETORY_MODULE, "Unexpected return from obj_gpl_license", "");
3717 break;
3718 }
3719
3720 if (flag_force_load)
3721 set_tainted(f, fd, m_name, 1, TAINT_FORCED_MODULE, "forced load", "");
3722
3723 if (fd >= 0)
3724 close(fd);
3725 }
3726 #else /* FEATURE_CHECK_TAINTED_MODULE */
3727 #define check_tainted_module(x, y) do { } while (0);
3728 #endif /* FEATURE_CHECK_TAINTED_MODULE */
3729
3730 #if ENABLE_FEATURE_INSMOD_KSYMOOPS_SYMBOLS
3731 /* add module source, timestamp, kernel version and a symbol for the
3732 * start of some sections. this info is used by ksymoops to do better
3733 * debugging.
3734 */
3735 static int
3736 get_module_version(struct obj_file *f, char str[STRVERSIONLEN])
3737 {
3738 #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING
3739 return new_get_module_version(f, str);
3740 #else /* FEATURE_INSMOD_VERSION_CHECKING */
3741 strncpy(str, "???", sizeof(str));
3742 return -1;
3743 #endif /* FEATURE_INSMOD_VERSION_CHECKING */
3744 }
3745
3746 /* add module source, timestamp, kernel version and a symbol for the
3747 * start of some sections. this info is used by ksymoops to do better
3748 * debugging.
3749 */
3750 static void
3751 add_ksymoops_symbols(struct obj_file *f, const char *filename,
3752 const char *m_name)
3753 {
3754 static const char symprefix[] ALIGN1 = "__insmod_";
3755
3756 struct obj_section *sec;
3757 struct obj_symbol *sym;
3758 char *name, *absolute_filename;
3759 char str[STRVERSIONLEN], real[PATH_MAX];
3760 int i, l, lm_name, lfilename, use_ksymtab, version;
3761 struct stat statbuf;
3762
3763 static const char *section_names[] = {
3764 ".text",
3765 ".rodata",
3766 ".data",
3767 ".bss",
3768 ".sbss"
3769 };
3770
3771 if (realpath(filename, real)) {
3772 absolute_filename = xstrdup(real);
3773 } else {
3774 bb_perror_msg("cannot get realpath for %s", filename);
3775 absolute_filename = xstrdup(filename);
3776 }
3777
3778 lm_name = strlen(m_name);
3779 lfilename = strlen(absolute_filename);
3780
3781 /* add to ksymtab if it already exists or there is no ksymtab and other symbols
3782 * are not to be exported. otherwise leave ksymtab alone for now, the
3783 * "export all symbols" compatibility code will export these symbols later.
3784 */
3785 use_ksymtab = obj_find_section(f, "__ksymtab") || flag_noexport;
3786
3787 sec = obj_find_section(f, ".this");
3788 if (sec) {
3789 /* tag the module header with the object name, last modified
3790 * timestamp and module version. worst case for module version
3791 * is 0xffffff, decimal 16777215. putting all three fields in
3792 * one symbol is less readable but saves kernel space.
3793 */
3794 l = sizeof(symprefix)+ /* "__insmod_" */
3795 lm_name+ /* module name */
3796 2+ /* "_O" */
3797 lfilename+ /* object filename */
3798 2+ /* "_M" */
3799 2*sizeof(statbuf.st_mtime)+ /* mtime in hex */
3800 2+ /* "_V" */
3801 8+ /* version in dec */
3802 1; /* nul */
3803 name = xmalloc(l);
3804 if (stat(absolute_filename, &statbuf) != 0)
3805 statbuf.st_mtime = 0;
3806 version = get_module_version(f, str); /* -1 if not found */
3807 snprintf(name, l, "%s%s_O%s_M%0*lX_V%d",
3808 symprefix, m_name, absolute_filename,
3809 (int)(2*sizeof(statbuf.st_mtime)), statbuf.st_mtime,
3810 version);
3811 sym = obj_add_symbol(f, name, -1,
3812 ELF_ST_INFO(STB_GLOBAL, STT_NOTYPE),
3813 sec->idx, sec->header.sh_addr, 0);
3814 if (use_ksymtab)
3815 new_add_ksymtab(f, sym);
3816 }
3817 free(absolute_filename);
3818 #ifdef _NOT_SUPPORTED_
3819 /* record where the persistent data is going, same address as previous symbol */
3820
3821 if (f->persist) {
3822 l = sizeof(symprefix)+ /* "__insmod_" */
3823 lm_name+ /* module name */
3824 2+ /* "_P" */
3825 strlen(f->persist)+ /* data store */
3826 1; /* nul */
3827 name = xmalloc(l);
3828 snprintf(name, l, "%s%s_P%s",
3829 symprefix, m_name, f->persist);
3830 sym = obj_add_symbol(f, name, -1, ELF_ST_INFO(STB_GLOBAL, STT_NOTYPE),
3831 sec->idx, sec->header.sh_addr, 0);
3832 if (use_ksymtab)
3833 new_add_ksymtab(f, sym);
3834 }
3835 #endif /* _NOT_SUPPORTED_ */
3836 /* tag the desired sections if size is non-zero */
3837
3838 for (i = 0; i < ARRAY_SIZE(section_names); ++i) {
3839 sec = obj_find_section(f, section_names[i]);
3840 if (sec && sec->header.sh_size) {
3841 l = sizeof(symprefix)+ /* "__insmod_" */
3842 lm_name+ /* module name */
3843 2+ /* "_S" */
3844 strlen(sec->name)+ /* section name */
3845 2+ /* "_L" */
3846 8+ /* length in dec */
3847 1; /* nul */
3848 name = xmalloc(l);
3849 snprintf(name, l, "%s%s_S%s_L%ld",
3850 symprefix, m_name, sec->name,
3851 (long)sec->header.sh_size);
3852 sym = obj_add_symbol(f, name, -1, ELF_ST_INFO(STB_GLOBAL, STT_NOTYPE),
3853 sec->idx, sec->header.sh_addr, 0);
3854 if (use_ksymtab)
3855 new_add_ksymtab(f, sym);
3856 }
3857 }
3858 }
3859 #endif /* FEATURE_INSMOD_KSYMOOPS_SYMBOLS */
3860
3861 #if ENABLE_FEATURE_INSMOD_LOAD_MAP
3862 static void print_load_map(struct obj_file *f)
3863 {
3864 struct obj_section *sec;
3865 #if ENABLE_FEATURE_INSMOD_LOAD_MAP_FULL
3866 struct obj_symbol **all, **p;
3867 int i, nsyms, *loaded;
3868 struct obj_symbol *sym;
3869 #endif
3870 /* Report on the section layout. */
3871
3872 printf("Sections: Size %-*s Align\n",
3873 (int) (2 * sizeof(void *)), "Address");
3874
3875 for (sec = f->load_order; sec; sec = sec->load_next) {
3876 int a;
3877 unsigned long tmp;
3878
3879 for (a = -1, tmp = sec->header.sh_addralign; tmp; ++a)
3880 tmp >>= 1;
3881 if (a == -1)
3882 a = 0;
3883
3884 printf("%-15s %08lx %0*lx 2**%d\n",
3885 sec->name,
3886 (long)sec->header.sh_size,
3887 (int) (2 * sizeof(void *)),
3888 (long)sec->header.sh_addr,
3889 a);
3890 }
3891 #if ENABLE_FEATURE_INSMOD_LOAD_MAP_FULL
3892 /* Quick reference which section indicies are loaded. */
3893
3894 loaded = alloca(sizeof(int) * (i = f->header.e_shnum));
3895 while (--i >= 0)
3896 loaded[i] = (f->sections[i]->header.sh_flags & SHF_ALLOC) != 0;
3897
3898 /* Collect the symbols we'll be listing. */
3899
3900 for (nsyms = i = 0; i < HASH_BUCKETS; ++i)
3901 for (sym = f->symtab[i]; sym; sym = sym->next)
3902 if (sym->secidx <= SHN_HIRESERVE
3903 && (sym->secidx >= SHN_LORESERVE || loaded[sym->secidx]))
3904 ++nsyms;
3905
3906 all = alloca(nsyms * sizeof(struct obj_symbol *));
3907
3908 for (i = 0, p = all; i < HASH_BUCKETS; ++i)
3909 for (sym = f->symtab[i]; sym; sym = sym->next)
3910 if (sym->secidx <= SHN_HIRESERVE
3911 && (sym->secidx >= SHN_LORESERVE || loaded[sym->secidx]))
3912 *p++ = sym;
3913
3914 /* And list them. */
3915 printf("\nSymbols:\n");
3916 for (p = all; p < all + nsyms; ++p) {
3917 char type = '?';
3918 unsigned long value;
3919
3920 sym = *p;
3921 if (sym->secidx == SHN_ABS) {
3922 type = 'A';
3923 value = sym->value;
3924 } else if (sym->secidx == SHN_UNDEF) {
3925 type = 'U';
3926 value = 0;
3927 } else {
3928 sec = f->sections[sym->secidx];
3929
3930 if (sec->header.sh_type == SHT_NOBITS)
3931 type = 'B';
3932 else if (sec->header.sh_flags & SHF_ALLOC) {
3933 if (sec->header.sh_flags & SHF_EXECINSTR)
3934 type = 'T';
3935 else if (sec->header.sh_flags & SHF_WRITE)
3936 type = 'D';
3937 else
3938 type = 'R';
3939 }
3940 value = sym->value + sec->header.sh_addr;
3941 }
3942
3943 if (ELF_ST_BIND(sym->info) == STB_LOCAL)
3944 type = tolower(type);
3945
3946 printf("%0*lx %c %s\n", (int) (2 * sizeof(void *)), value,
3947 type, sym->name);
3948 }
3949 #endif
3950 }
3951 #else /* !FEATURE_INSMOD_LOAD_MAP */
3952 void print_load_map(struct obj_file *f);
3953 #endif
3954
3955 int insmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
3956 int insmod_main(int argc, char **argv)
3957 {
3958 char *opt_o, *arg1;
3959 int len;
3960 int k_crcs;
3961 char *tmp, *tmp1;
3962 unsigned long m_size;
3963 ElfW(Addr) m_addr;
3964 struct obj_file *f;
3965 struct stat st;
3966 char *m_name = 0;
3967 int exit_status = EXIT_FAILURE;
3968 int m_has_modinfo;
3969 #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING
3970 struct utsname uts_info;
3971 char m_strversion[STRVERSIONLEN];
3972 int m_version, m_crcs;
3973 #endif
3974 #if ENABLE_FEATURE_CLEAN_UP
3975 FILE *fp = NULL;
3976 #else
3977 FILE *fp;
3978 #endif
3979 int k_version = 0;
3980 struct utsname myuname;
3981
3982 /* Parse any options */
3983 getopt32(argv, OPTION_STR, &opt_o);
3984 arg1 = argv[optind];
3985 if (option_mask32 & OPT_o) { // -o /* name the output module */
3986 free(m_name);
3987 m_name = xstrdup(opt_o);
3988 }
3989
3990 if (arg1 == NULL) {
3991 bb_show_usage();
3992 }
3993
3994 /* Grab the module name */
3995 tmp1 = xstrdup(arg1);
3996 tmp = basename(tmp1);
3997 len = strlen(tmp);
3998
3999 if (uname(&myuname) == 0) {
4000 if (myuname.release[0] == '2') {
4001 k_version = myuname.release[2] - '0';
4002 }
4003 }
4004
4005 #if ENABLE_FEATURE_2_6_MODULES
4006 if (k_version > 4 && len > 3 && tmp[len - 3] == '.'
4007 && tmp[len - 2] == 'k' && tmp[len - 1] == 'o'
4008 ) {
4009 len -= 3;
4010 tmp[len] = '\0';
4011 } else
4012 #endif
4013 if (len > 2 && tmp[len - 2] == '.' && tmp[len - 1] == 'o') {
4014 len -= 2;
4015 tmp[len] = '\0';
4016 }
4017
4018
4019 #if ENABLE_FEATURE_2_6_MODULES
4020 if (k_version > 4)
4021 m_fullName = xasprintf("%s.ko", tmp);
4022 else
4023 #endif
4024 m_fullName = xasprintf("%s.o", tmp);
4025
4026 if (!m_name) {
4027 m_name = tmp;
4028 } else {
4029 free(tmp1);
4030 tmp1 = 0; /* flag for free(m_name) before exit() */
4031 }
4032
4033 /* Get a filedesc for the module. Check that we have a complete path */
4034 if (stat(arg1, &st) < 0 || !S_ISREG(st.st_mode)
4035 || (fp = fopen(arg1, "r")) == NULL
4036 ) {
4037 /* Hmm. Could not open it. First search under /lib/modules/`uname -r`,
4038 * but do not error out yet if we fail to find it... */
4039 if (k_version) { /* uname succeedd */
4040 char *module_dir;
4041 char *tmdn;
4042 char real_module_dir[FILENAME_MAX];
4043
4044 tmdn = concat_path_file(_PATH_MODULES, myuname.release);
4045 /* Jump through hoops in case /lib/modules/`uname -r`
4046 * is a symlink. We do not want recursive_action to
4047 * follow symlinks, but we do want to follow the
4048 * /lib/modules/`uname -r` dir, So resolve it ourselves
4049 * if it is a link... */
4050 if (realpath(tmdn, real_module_dir) == NULL)
4051 module_dir = tmdn;
4052 else
4053 module_dir = real_module_dir;
4054 recursive_action(module_dir, ACTION_RECURSE,
4055 check_module_name_match, 0, m_fullName, 0);
4056 free(tmdn);
4057 }
4058
4059 /* Check if we have found anything yet */
4060 if (!m_filename || ((fp = fopen(m_filename, "r")) == NULL)) {
4061 char module_dir[FILENAME_MAX];
4062
4063 free(m_filename);
4064 m_filename = NULL;
4065 if (realpath(_PATH_MODULES, module_dir) == NULL)
4066 strcpy(module_dir, _PATH_MODULES);
4067 /* No module found under /lib/modules/`uname -r`, this
4068 * time cast the net a bit wider. Search /lib/modules/ */
4069 if (!recursive_action(module_dir, ACTION_RECURSE,
4070 check_module_name_match, 0, m_fullName, 0)
4071 ) {
4072 if (m_filename == 0
4073 || ((fp = fopen(m_filename, "r")) == NULL)
4074 ) {
4075 bb_error_msg("%s: module not found", m_fullName);
4076 goto out;
4077 }
4078 } else
4079 bb_error_msg_and_die("%s: module not found", m_fullName);
4080 }
4081 } else
4082 m_filename = xstrdup(arg1);
4083
4084 if (flag_verbose)
4085 printf("Using %s\n", m_filename);
4086
4087 #if ENABLE_FEATURE_2_6_MODULES
4088 if (k_version > 4) {
4089 argv[optind] = m_filename;
4090 optind--;
4091 return insmod_ng_main(argc - optind, argv + optind);
4092 }
4093 #endif
4094
4095 f = obj_load(fp, LOADBITS);
4096 if (f == NULL)
4097 bb_perror_msg_and_die("cannot load the module");
4098
4099 if (get_modinfo_value(f, "kernel_version") == NULL)
4100 m_has_modinfo = 0;
4101 else
4102 m_has_modinfo = 1;
4103
4104 #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING
4105 /* Version correspondence? */
4106 if (!flag_quiet) {
4107 if (uname(&uts_info) < 0)
4108 uts_info.release[0] = '\0';
4109 if (m_has_modinfo) {
4110 m_version = new_get_module_version(f, m_strversion);
4111 if (m_version == -1) {
4112 bb_error_msg("cannot find the kernel version the module was "
4113 "compiled for");
4114 goto out;
4115 }
4116 }
4117
4118 if (strncmp(uts_info.release, m_strversion, STRVERSIONLEN) != 0) {
4119 bb_error_msg("%skernel-module version mismatch\n"
4120 "\t%s was compiled for kernel version %s\n"
4121 "\twhile this kernel is version %s",
4122 flag_force_load ? "warning: " : "",
4123 m_filename, m_strversion, uts_info.release);
4124 if (!flag_force_load)
4125 goto out;
4126 }
4127 }
4128 k_crcs = 0;
4129 #endif /* FEATURE_INSMOD_VERSION_CHECKING */
4130
4131 if (!query_module(NULL, 0, NULL, 0, NULL)) {
4132 if (!new_get_kernel_symbols())
4133 goto out;
4134 k_crcs = new_is_kernel_checksummed();
4135 } else {
4136 bb_error_msg("not configured to support old kernels");
4137 goto out;
4138 }
4139
4140 #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING
4141 m_crcs = 0;
4142 if (m_has_modinfo)
4143 m_crcs = new_is_module_checksummed(f);
4144
4145 if (m_crcs != k_crcs)
4146 obj_set_symbol_compare(f, ncv_strcmp, ncv_symbol_hash);
4147 #endif /* FEATURE_INSMOD_VERSION_CHECKING */
4148
4149 /* Let the module know about the kernel symbols. */
4150 add_kernel_symbols(f);
4151
4152 /* Allocate common symbols, symbol tables, and string tables. */
4153
4154 if (!new_create_this_module(f, m_name)) {
4155 goto out;
4156 }
4157
4158 if (!obj_check_undefineds(f)) {
4159 goto out;
4160 }
4161 obj_allocate_commons(f);
4162 check_tainted_module(f, m_name);
4163
4164 /* done with the module name, on to the optional var=value arguments */
4165 ++optind;
4166 if (optind < argc) {
4167 if (!new_process_module_arguments(f, argc - optind, argv + optind)) {
4168 goto out;
4169 }
4170 }
4171
4172 arch_create_got(f);
4173 hide_special_symbols(f);
4174
4175 #if ENABLE_FEATURE_INSMOD_KSYMOOPS_SYMBOLS
4176 add_ksymoops_symbols(f, m_filename, m_name);
4177 #endif /* FEATURE_INSMOD_KSYMOOPS_SYMBOLS */
4178
4179 new_create_module_ksymtab(f);
4180
4181 /* Find current size of the module */
4182 m_size = obj_load_size(f);
4183
4184
4185 m_addr = create_module(m_name, m_size);
4186 if (m_addr == -1) switch (errno) {
4187 case EEXIST:
4188 bb_error_msg("a module named %s already exists", m_name);
4189 goto out;
4190 case ENOMEM:
4191 bb_error_msg("can't allocate kernel memory for module; needed %lu bytes",
4192 m_size);
4193 goto out;
4194 default:
4195 bb_perror_msg("create_module: %s", m_name);
4196 goto out;
4197 }
4198
4199 #if !LOADBITS
4200 /*
4201 * the PROGBITS section was not loaded by the obj_load
4202 * now we can load them directly into the kernel memory
4203 */
4204 if (!obj_load_progbits(fp, f, (char*)m_addr)) {
4205 delete_module(m_name);
4206 goto out;
4207 }
4208 #endif
4209
4210 if (!obj_relocate(f, m_addr)) {
4211 delete_module(m_name);
4212 goto out;
4213 }
4214
4215 if (!new_init_module(m_name, f, m_size)) {
4216 delete_module(m_name);
4217 goto out;
4218 }
4219
4220 if (flag_print_load_map)
4221 print_load_map(f);
4222
4223 exit_status = EXIT_SUCCESS;
4224
4225 out:
4226 #if ENABLE_FEATURE_CLEAN_UP
4227 if (fp)
4228 fclose(fp);
4229 free(tmp1);
4230 if (!tmp1)
4231 free(m_name);
4232 free(m_filename);
4233 #endif
4234 return exit_status;
4235 }
4236
4237
4238 #endif
4239
4240
4241 #if ENABLE_FEATURE_2_6_MODULES
4242
4243 #include <sys/mman.h>
4244 #include <asm/unistd.h>
4245 #include <sys/syscall.h>
4246
4247 /* We use error numbers in a loose translation... */
4248 static const char *moderror(int err)
4249 {
4250 switch (err) {
4251 case ENOEXEC:
4252 return "Invalid module format";
4253 case ENOENT:
4254 return "Unknown symbol in module";
4255 case ESRCH:
4256 return "Module has wrong symbol version";
4257 case EINVAL:
4258 return "Invalid parameters";
4259 default:
4260 return strerror(err);
4261 }
4262 }
4263
4264 int insmod_ng_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
4265 int insmod_ng_main(int argc, char **argv)
4266 {
4267 long ret;
4268 size_t len;
4269 int optlen;
4270 void *map;
4271 char *filename, *options;
4272
4273 filename = *++argv;
4274 if (!filename)
4275 bb_show_usage();
4276
4277 /* Rest is options */
4278 options = xzalloc(1);
4279 optlen = 0;
4280 while (*++argv) {
4281 options = xrealloc(options, optlen + 2 + strlen(*argv) + 2);
4282 /* Spaces handled by "" pairs, but no way of escaping quotes */
4283 optlen += sprintf(options + optlen, (strchr(*argv,' ') ? "\"%s\" " : "%s "), *argv);
4284 }
4285
4286 #if 0
4287 /* Any special reason why mmap? It isn't performace critical... */
4288 int fd;
4289 struct stat st;
4290 unsigned long len;
4291 fd = xopen(filename, O_RDONLY);
4292 fstat(fd, &st);
4293 len = st.st_size;
4294 map = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd, 0);
4295 if (map == MAP_FAILED) {
4296 bb_perror_msg_and_die("cannot mmap '%s'", filename);
4297 }
4298
4299 /* map == NULL on Blackfin, probably on other MMU-less systems too. Workaround. */
4300 if (map == NULL) {
4301 map = xmalloc(len);
4302 xread(fd, map, len);
4303 }
4304 #else
4305 len = MAXINT(ssize_t);
4306 map = xmalloc_open_read_close(filename, &len);
4307 #endif
4308
4309 ret = syscall(__NR_init_module, map, len, options);
4310 if (ret != 0) {
4311 bb_perror_msg_and_die("cannot insert '%s': %s (%li)",
4312 filename, moderror(errno), ret);
4313 }
4314
4315 return 0;
4316 }
4317
4318 #endif
Busybox: The Swiss Army Knife of Embedded Linux