1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 1998-2000 Doug Rabson
5 * Copyright (c) 2004 Peter Wemm
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include "opt_ddb.h"
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/fcntl.h>
35 #include <sys/kernel.h>
36 #include <sys/lock.h>
37 #include <sys/malloc.h>
38 #include <sys/linker.h>
39 #include <sys/mutex.h>
40 #include <sys/mount.h>
41 #include <sys/namei.h>
42 #include <sys/proc.h>
43 #include <sys/rwlock.h>
44 #include <sys/sysctl.h>
45 #include <sys/vnode.h>
46
47 #include <machine/elf.h>
48
49 #include <net/vnet.h>
50
51 #include <security/mac/mac_framework.h>
52
53 #include <vm/vm.h>
54 #include <vm/vm_param.h>
55 #include <vm/pmap.h>
56 #include <vm/vm_extern.h>
57 #include <vm/vm_kern.h>
58 #include <vm/vm_map.h>
59 #include <vm/vm_object.h>
60 #include <vm/vm_page.h>
61 #include <vm/vm_pager.h>
62
63 #include <sys/link_elf.h>
64
65 #ifdef DDB_CTF
66 #include <contrib/zlib/zlib.h>
67 #endif
68
69 #include "linker_if.h"
70
71 typedef struct {
72 void *addr;
73 Elf_Off size;
74 int flags; /* Section flags. */
75 int sec; /* Original section number. */
76 char *name;
77 } Elf_progent;
78
79 typedef struct {
80 Elf_Rel *rel;
81 int nrel;
82 int sec;
83 } Elf_relent;
84
85 typedef struct {
86 Elf_Rela *rela;
87 int nrela;
88 int sec;
89 } Elf_relaent;
90
91 typedef struct elf_file {
92 struct linker_file lf; /* Common fields */
93
94 int preloaded;
95 caddr_t address; /* Relocation address */
96 vm_object_t object; /* VM object to hold file pages */
97 Elf_Shdr *e_shdr;
98
99 Elf_progent *progtab;
100 u_int nprogtab;
101
102 Elf_relaent *relatab;
103 u_int nrelatab;
104
105 Elf_relent *reltab;
106 int nreltab;
107
108 Elf_Sym *ddbsymtab; /* The symbol table we are using */
109 long ddbsymcnt; /* Number of symbols */
110 caddr_t ddbstrtab; /* String table */
111 long ddbstrcnt; /* number of bytes in string table */
112
113 caddr_t shstrtab; /* Section name string table */
114 long shstrcnt; /* number of bytes in string table */
115
116 caddr_t ctftab; /* CTF table */
117 long ctfcnt; /* number of bytes in CTF table */
118 caddr_t ctfoff; /* CTF offset table */
119 caddr_t typoff; /* Type offset table */
120 long typlen; /* Number of type entries. */
121
122 } *elf_file_t;
123
124 #include <kern/kern_ctf.c>
125
126 static int link_elf_link_preload(linker_class_t cls,
127 const char *, linker_file_t *);
128 static int link_elf_link_preload_finish(linker_file_t);
129 static int link_elf_load_file(linker_class_t, const char *, linker_file_t *);
130 static int link_elf_lookup_symbol(linker_file_t, const char *,
131 c_linker_sym_t *);
132 static int link_elf_lookup_debug_symbol(linker_file_t, const char *,
133 c_linker_sym_t *);
134 static int link_elf_lookup_debug_symbol_ctf(linker_file_t lf,
135 const char *name, c_linker_sym_t *sym, linker_ctf_t *lc);
136 static int link_elf_symbol_values(linker_file_t, c_linker_sym_t,
137 linker_symval_t *);
138 static int link_elf_debug_symbol_values(linker_file_t, c_linker_sym_t,
139 linker_symval_t *);
140 static int link_elf_search_symbol(linker_file_t, caddr_t value,
141 c_linker_sym_t *sym, long *diffp);
142
143 static void link_elf_unload_file(linker_file_t);
144 static int link_elf_lookup_set(linker_file_t, const char *,
145 void ***, void ***, int *);
146 static int link_elf_each_function_name(linker_file_t,
147 int (*)(const char *, void *), void *);
148 static int link_elf_each_function_nameval(linker_file_t,
149 linker_function_nameval_callback_t,
150 void *);
151 static int link_elf_reloc_local(linker_file_t, bool);
152 static long link_elf_symtab_get(linker_file_t, const Elf_Sym **);
153 static long link_elf_strtab_get(linker_file_t, caddr_t *);
154 #ifdef VIMAGE
155 static void link_elf_propagate_vnets(linker_file_t);
156 #endif
157
158 static int elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps,
159 Elf_Addr *);
160
161 static kobj_method_t link_elf_methods[] = {
162 KOBJMETHOD(linker_lookup_symbol, link_elf_lookup_symbol),
163 KOBJMETHOD(linker_lookup_debug_symbol, link_elf_lookup_debug_symbol),
164 KOBJMETHOD(linker_lookup_debug_symbol_ctf, link_elf_lookup_debug_symbol_ctf),
165 KOBJMETHOD(linker_symbol_values, link_elf_symbol_values),
166 KOBJMETHOD(linker_debug_symbol_values, link_elf_debug_symbol_values),
167 KOBJMETHOD(linker_search_symbol, link_elf_search_symbol),
168 KOBJMETHOD(linker_unload, link_elf_unload_file),
169 KOBJMETHOD(linker_load_file, link_elf_load_file),
170 KOBJMETHOD(linker_link_preload, link_elf_link_preload),
171 KOBJMETHOD(linker_link_preload_finish, link_elf_link_preload_finish),
172 KOBJMETHOD(linker_lookup_set, link_elf_lookup_set),
173 KOBJMETHOD(linker_each_function_name, link_elf_each_function_name),
174 KOBJMETHOD(linker_each_function_nameval, link_elf_each_function_nameval),
175 KOBJMETHOD(linker_ctf_get, link_elf_ctf_get),
176 KOBJMETHOD(linker_ctf_lookup_typename, link_elf_ctf_lookup_typename),
177 KOBJMETHOD(linker_symtab_get, link_elf_symtab_get),
178 KOBJMETHOD(linker_strtab_get, link_elf_strtab_get),
179 #ifdef VIMAGE
180 KOBJMETHOD(linker_propagate_vnets, link_elf_propagate_vnets),
181 #endif
182 KOBJMETHOD_END
183 };
184
185 static struct linker_class link_elf_class = {
186 #if ELF_TARG_CLASS == ELFCLASS32
187 "elf32_obj",
188 #else
189 "elf64_obj",
190 #endif
191 link_elf_methods, sizeof(struct elf_file)
192 };
193
194 static bool link_elf_obj_leak_locals = true;
195 SYSCTL_BOOL(_debug, OID_AUTO, link_elf_obj_leak_locals,
196 CTLFLAG_RWTUN, &link_elf_obj_leak_locals, 0,
197 "Allow local symbols to participate in global module symbol resolution");
198
199 static int relocate_file(elf_file_t ef);
200 static void elf_obj_cleanup_globals_cache(elf_file_t);
201
202 static void
link_elf_error(const char * filename,const char * s)203 link_elf_error(const char *filename, const char *s)
204 {
205 if (filename == NULL)
206 printf("kldload: %s\n", s);
207 else
208 printf("kldload: %s: %s\n", filename, s);
209 }
210
211 static void
link_elf_init(void * arg)212 link_elf_init(void *arg)
213 {
214
215 linker_add_class(&link_elf_class);
216 }
217 SYSINIT(link_elf_obj, SI_SUB_KLD, SI_ORDER_SECOND, link_elf_init, NULL);
218
219 static void
link_elf_protect_range(elf_file_t ef,vm_offset_t start,vm_offset_t end,vm_prot_t prot)220 link_elf_protect_range(elf_file_t ef, vm_offset_t start, vm_offset_t end,
221 vm_prot_t prot)
222 {
223 int error __unused;
224
225 KASSERT(start <= end && start >= (vm_offset_t)ef->address &&
226 end <= round_page((vm_offset_t)ef->address + ef->lf.size),
227 ("link_elf_protect_range: invalid range %#jx-%#jx",
228 (uintmax_t)start, (uintmax_t)end));
229
230 if (start == end)
231 return;
232 if (ef->preloaded) {
233 #ifdef __amd64__
234 error = pmap_change_prot(start, end - start, prot);
235 KASSERT(error == 0,
236 ("link_elf_protect_range: pmap_change_prot() returned %d",
237 error));
238 #endif
239 return;
240 }
241 error = vm_map_protect(kernel_map, start, end, prot, 0,
242 VM_MAP_PROTECT_SET_PROT);
243 KASSERT(error == KERN_SUCCESS,
244 ("link_elf_protect_range: vm_map_protect() returned %d", error));
245 }
246
247 /*
248 * Restrict permissions on linker file memory based on section flags.
249 * Sections need not be page-aligned, so overlap within a page is possible.
250 */
251 static void
link_elf_protect(elf_file_t ef)252 link_elf_protect(elf_file_t ef)
253 {
254 vm_offset_t end, segend, segstart, start;
255 vm_prot_t gapprot, prot, segprot;
256 int i;
257
258 /*
259 * If the file was preloaded, the last page may contain other preloaded
260 * data which may need to be writeable. ELF files are always
261 * page-aligned, but other preloaded data, such as entropy or CPU
262 * microcode may be loaded with a smaller alignment.
263 */
264 gapprot = ef->preloaded ? VM_PROT_RW : VM_PROT_READ;
265
266 start = end = (vm_offset_t)ef->address;
267 prot = VM_PROT_READ;
268 for (i = 0; i < ef->nprogtab; i++) {
269 /*
270 * VNET and DPCPU sections have their memory allocated by their
271 * respective subsystems.
272 */
273 if (ef->progtab[i].name != NULL && (
274 #ifdef VIMAGE
275 strcmp(ef->progtab[i].name, VNET_SETNAME) == 0 ||
276 #endif
277 strcmp(ef->progtab[i].name, DPCPU_SETNAME) == 0))
278 continue;
279
280 segstart = trunc_page((vm_offset_t)ef->progtab[i].addr);
281 segend = round_page((vm_offset_t)ef->progtab[i].addr +
282 ef->progtab[i].size);
283 segprot = VM_PROT_READ;
284 if ((ef->progtab[i].flags & SHF_WRITE) != 0)
285 segprot |= VM_PROT_WRITE;
286 if ((ef->progtab[i].flags & SHF_EXECINSTR) != 0)
287 segprot |= VM_PROT_EXECUTE;
288
289 if (end <= segstart) {
290 /*
291 * Case 1: there is no overlap between the previous
292 * segment and this one. Apply protections to the
293 * previous segment, and protect the gap between the
294 * previous and current segments, if any.
295 */
296 link_elf_protect_range(ef, start, end, prot);
297 link_elf_protect_range(ef, end, segstart, gapprot);
298
299 start = segstart;
300 end = segend;
301 prot = segprot;
302 } else if (start < segstart && end == segend) {
303 /*
304 * Case 2: the current segment is a subrange of the
305 * previous segment. Apply protections to the
306 * non-overlapping portion of the previous segment.
307 */
308 link_elf_protect_range(ef, start, segstart, prot);
309
310 start = segstart;
311 prot |= segprot;
312 } else if (end < segend) {
313 /*
314 * Case 3: there is partial overlap between the previous
315 * and current segments. Apply protections to the
316 * non-overlapping portion of the previous segment, and
317 * then the overlap, which must use the union of the two
318 * segments' protections.
319 */
320 link_elf_protect_range(ef, start, segstart, prot);
321 link_elf_protect_range(ef, segstart, end,
322 prot | segprot);
323 start = end;
324 end = segend;
325 prot = segprot;
326 } else {
327 /*
328 * Case 4: the two segments reside in the same page.
329 */
330 prot |= segprot;
331 }
332 }
333
334 /*
335 * Fix up the last unprotected segment and trailing data.
336 */
337 link_elf_protect_range(ef, start, end, prot);
338 link_elf_protect_range(ef, end,
339 round_page((vm_offset_t)ef->address + ef->lf.size), gapprot);
340 }
341
342 static int
link_elf_link_preload(linker_class_t cls,const char * filename,linker_file_t * result)343 link_elf_link_preload(linker_class_t cls, const char *filename,
344 linker_file_t *result)
345 {
346 Elf_Ehdr *hdr;
347 Elf_Shdr *shdr;
348 Elf_Sym *es;
349 void *modptr, *baseptr, *sizeptr;
350 char *type;
351 elf_file_t ef;
352 linker_file_t lf;
353 Elf_Addr off;
354 int error, i, j, pb, ra, rl, shstrindex, symstrindex, symtabindex;
355
356 /* Look to see if we have the file preloaded */
357 modptr = preload_search_by_name(filename);
358 if (modptr == NULL)
359 return ENOENT;
360
361 type = (char *)preload_search_info(modptr, MODINFO_TYPE);
362 baseptr = preload_search_info(modptr, MODINFO_ADDR);
363 sizeptr = preload_search_info(modptr, MODINFO_SIZE);
364 hdr = (Elf_Ehdr *)preload_search_info(modptr, MODINFO_METADATA |
365 MODINFOMD_ELFHDR);
366 shdr = (Elf_Shdr *)preload_search_info(modptr, MODINFO_METADATA |
367 MODINFOMD_SHDR);
368 if (type == NULL || (strcmp(type, "elf" __XSTRING(__ELF_WORD_SIZE)
369 " obj module") != 0 &&
370 strcmp(type, "elf obj module") != 0)) {
371 return (EFTYPE);
372 }
373 if (baseptr == NULL || sizeptr == NULL || hdr == NULL ||
374 shdr == NULL)
375 return (EINVAL);
376
377 lf = linker_make_file(filename, &link_elf_class);
378 if (lf == NULL)
379 return (ENOMEM);
380
381 ef = (elf_file_t)lf;
382 ef->preloaded = 1;
383 ef->address = *(caddr_t *)baseptr;
384 lf->address = *(caddr_t *)baseptr;
385 lf->size = *(size_t *)sizeptr;
386
387 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
388 hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
389 hdr->e_ident[EI_VERSION] != EV_CURRENT ||
390 hdr->e_version != EV_CURRENT ||
391 hdr->e_type != ET_REL ||
392 hdr->e_machine != ELF_TARG_MACH) {
393 error = EFTYPE;
394 goto out;
395 }
396 ef->e_shdr = shdr;
397
398 /* Scan the section header for information and table sizing. */
399 symtabindex = -1;
400 symstrindex = -1;
401 for (i = 0; i < hdr->e_shnum; i++) {
402 switch (shdr[i].sh_type) {
403 case SHT_PROGBITS:
404 case SHT_NOBITS:
405 #ifdef __amd64__
406 case SHT_X86_64_UNWIND:
407 #endif
408 case SHT_INIT_ARRAY:
409 case SHT_FINI_ARRAY:
410 /* Ignore sections not loaded by the loader. */
411 if (shdr[i].sh_addr == 0)
412 break;
413 ef->nprogtab++;
414 break;
415 case SHT_SYMTAB:
416 symtabindex = i;
417 symstrindex = shdr[i].sh_link;
418 break;
419 case SHT_REL:
420 /*
421 * Ignore relocation tables for sections not
422 * loaded by the loader.
423 */
424 if (shdr[shdr[i].sh_info].sh_addr == 0)
425 break;
426 ef->nreltab++;
427 break;
428 case SHT_RELA:
429 if (shdr[shdr[i].sh_info].sh_addr == 0)
430 break;
431 ef->nrelatab++;
432 break;
433 }
434 }
435
436 shstrindex = hdr->e_shstrndx;
437 if (ef->nprogtab == 0 || symstrindex < 0 ||
438 symstrindex >= hdr->e_shnum ||
439 shdr[symstrindex].sh_type != SHT_STRTAB || shstrindex == 0 ||
440 shstrindex >= hdr->e_shnum ||
441 shdr[shstrindex].sh_type != SHT_STRTAB) {
442 printf("%s: bad/missing section headers\n", filename);
443 error = ENOEXEC;
444 goto out;
445 }
446
447 /* Allocate space for tracking the load chunks */
448 if (ef->nprogtab != 0)
449 ef->progtab = malloc(ef->nprogtab * sizeof(*ef->progtab),
450 M_LINKER, M_WAITOK | M_ZERO);
451 if (ef->nreltab != 0)
452 ef->reltab = malloc(ef->nreltab * sizeof(*ef->reltab),
453 M_LINKER, M_WAITOK | M_ZERO);
454 if (ef->nrelatab != 0)
455 ef->relatab = malloc(ef->nrelatab * sizeof(*ef->relatab),
456 M_LINKER, M_WAITOK | M_ZERO);
457 if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
458 (ef->nreltab != 0 && ef->reltab == NULL) ||
459 (ef->nrelatab != 0 && ef->relatab == NULL)) {
460 error = ENOMEM;
461 goto out;
462 }
463
464 /* XXX, relocate the sh_addr fields saved by the loader. */
465 off = 0;
466 for (i = 0; i < hdr->e_shnum; i++) {
467 if (shdr[i].sh_addr != 0 && (off == 0 || shdr[i].sh_addr < off))
468 off = shdr[i].sh_addr;
469 }
470 for (i = 0; i < hdr->e_shnum; i++) {
471 if (shdr[i].sh_addr != 0)
472 shdr[i].sh_addr = shdr[i].sh_addr - off +
473 (Elf_Addr)ef->address;
474 }
475
476 ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
477 ef->ddbsymtab = (Elf_Sym *)shdr[symtabindex].sh_addr;
478 ef->ddbstrcnt = shdr[symstrindex].sh_size;
479 ef->ddbstrtab = (char *)shdr[symstrindex].sh_addr;
480 ef->shstrcnt = shdr[shstrindex].sh_size;
481 ef->shstrtab = (char *)shdr[shstrindex].sh_addr;
482
483 /* Now fill out progtab and the relocation tables. */
484 pb = 0;
485 rl = 0;
486 ra = 0;
487 for (i = 0; i < hdr->e_shnum; i++) {
488 switch (shdr[i].sh_type) {
489 case SHT_PROGBITS:
490 case SHT_NOBITS:
491 #ifdef __amd64__
492 case SHT_X86_64_UNWIND:
493 #endif
494 case SHT_INIT_ARRAY:
495 case SHT_FINI_ARRAY:
496 if (shdr[i].sh_addr == 0)
497 break;
498 ef->progtab[pb].addr = (void *)shdr[i].sh_addr;
499 if (shdr[i].sh_type == SHT_PROGBITS)
500 ef->progtab[pb].name = "<<PROGBITS>>";
501 #ifdef __amd64__
502 else if (shdr[i].sh_type == SHT_X86_64_UNWIND)
503 ef->progtab[pb].name = "<<UNWIND>>";
504 #endif
505 else if (shdr[i].sh_type == SHT_INIT_ARRAY)
506 ef->progtab[pb].name = "<<INIT_ARRAY>>";
507 else if (shdr[i].sh_type == SHT_FINI_ARRAY)
508 ef->progtab[pb].name = "<<FINI_ARRAY>>";
509 else
510 ef->progtab[pb].name = "<<NOBITS>>";
511 ef->progtab[pb].size = shdr[i].sh_size;
512 ef->progtab[pb].flags = shdr[i].sh_flags;
513 ef->progtab[pb].sec = i;
514 if (ef->shstrtab && shdr[i].sh_name != 0)
515 ef->progtab[pb].name =
516 ef->shstrtab + shdr[i].sh_name;
517 if (ef->progtab[pb].name != NULL &&
518 !strcmp(ef->progtab[pb].name, DPCPU_SETNAME)) {
519 void *dpcpu;
520
521 dpcpu = dpcpu_alloc(shdr[i].sh_size);
522 if (dpcpu == NULL) {
523 printf("%s: pcpu module space is out "
524 "of space; cannot allocate %#jx "
525 "for %s\n", __func__,
526 (uintmax_t)shdr[i].sh_size,
527 filename);
528 error = ENOSPC;
529 goto out;
530 }
531 memcpy(dpcpu, ef->progtab[pb].addr,
532 ef->progtab[pb].size);
533 dpcpu_copy(dpcpu, shdr[i].sh_size);
534 ef->progtab[pb].addr = dpcpu;
535 #ifdef VIMAGE
536 } else if (ef->progtab[pb].name != NULL &&
537 !strcmp(ef->progtab[pb].name, VNET_SETNAME)) {
538 void *vnet_data;
539
540 vnet_data = vnet_data_alloc(shdr[i].sh_size);
541 if (vnet_data == NULL) {
542 printf("%s: vnet module space is out "
543 "of space; cannot allocate %#jx "
544 "for %s\n", __func__,
545 (uintmax_t)shdr[i].sh_size,
546 filename);
547 error = ENOSPC;
548 goto out;
549 }
550 memcpy(vnet_data, ef->progtab[pb].addr,
551 ef->progtab[pb].size);
552 ef->progtab[pb].addr = vnet_data;
553 vnet_save_init(ef->progtab[pb].addr,
554 ef->progtab[pb].size);
555 #endif
556 } else if ((ef->progtab[pb].name != NULL &&
557 strcmp(ef->progtab[pb].name, ".ctors") == 0) ||
558 shdr[i].sh_type == SHT_INIT_ARRAY) {
559 if (lf->ctors_addr != 0) {
560 printf(
561 "%s: multiple ctor sections in %s\n",
562 __func__, filename);
563 } else {
564 lf->ctors_addr = ef->progtab[pb].addr;
565 lf->ctors_size = shdr[i].sh_size;
566 }
567 } else if ((ef->progtab[pb].name != NULL &&
568 strcmp(ef->progtab[pb].name, ".dtors") == 0) ||
569 shdr[i].sh_type == SHT_FINI_ARRAY) {
570 if (lf->dtors_addr != 0) {
571 printf(
572 "%s: multiple dtor sections in %s\n",
573 __func__, filename);
574 } else {
575 lf->dtors_addr = ef->progtab[pb].addr;
576 lf->dtors_size = shdr[i].sh_size;
577 }
578 }
579
580 /* Update all symbol values with the offset. */
581 for (j = 0; j < ef->ddbsymcnt; j++) {
582 es = &ef->ddbsymtab[j];
583 if (es->st_shndx != i)
584 continue;
585 es->st_value += (Elf_Addr)ef->progtab[pb].addr;
586 }
587 pb++;
588 break;
589 case SHT_REL:
590 if (shdr[shdr[i].sh_info].sh_addr == 0)
591 break;
592 ef->reltab[rl].rel = (Elf_Rel *)shdr[i].sh_addr;
593 ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
594 ef->reltab[rl].sec = shdr[i].sh_info;
595 rl++;
596 break;
597 case SHT_RELA:
598 if (shdr[shdr[i].sh_info].sh_addr == 0)
599 break;
600 ef->relatab[ra].rela = (Elf_Rela *)shdr[i].sh_addr;
601 ef->relatab[ra].nrela =
602 shdr[i].sh_size / sizeof(Elf_Rela);
603 ef->relatab[ra].sec = shdr[i].sh_info;
604 ra++;
605 break;
606 }
607 }
608 if (pb != ef->nprogtab) {
609 printf("%s: lost progbits\n", filename);
610 error = ENOEXEC;
611 goto out;
612 }
613 if (rl != ef->nreltab) {
614 printf("%s: lost reltab\n", filename);
615 error = ENOEXEC;
616 goto out;
617 }
618 if (ra != ef->nrelatab) {
619 printf("%s: lost relatab\n", filename);
620 error = ENOEXEC;
621 goto out;
622 }
623
624 /*
625 * The file needs to be writeable and executable while applying
626 * relocations. Mapping protections are applied once relocation
627 * processing is complete.
628 */
629 link_elf_protect_range(ef, (vm_offset_t)ef->address,
630 round_page((vm_offset_t)ef->address + ef->lf.size), VM_PROT_ALL);
631
632 /* Local intra-module relocations */
633 error = link_elf_reloc_local(lf, false);
634 if (error != 0)
635 goto out;
636 *result = lf;
637 return (0);
638
639 out:
640 /* preload not done this way */
641 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
642 return (error);
643 }
644
645 static void
link_elf_invoke_cbs(caddr_t addr,size_t size)646 link_elf_invoke_cbs(caddr_t addr, size_t size)
647 {
648 void (**ctor)(void);
649 size_t i, cnt;
650
651 if (addr == NULL || size == 0)
652 return;
653 cnt = size / sizeof(*ctor);
654 ctor = (void *)addr;
655 for (i = 0; i < cnt; i++) {
656 if (ctor[i] != NULL)
657 (*ctor[i])();
658 }
659 }
660
661 static void
link_elf_invoke_ctors(linker_file_t lf)662 link_elf_invoke_ctors(linker_file_t lf)
663 {
664 KASSERT(lf->ctors_invoked == LF_NONE,
665 ("%s: file %s ctor state %d",
666 __func__, lf->filename, lf->ctors_invoked));
667
668 link_elf_invoke_cbs(lf->ctors_addr, lf->ctors_size);
669 lf->ctors_invoked = LF_CTORS;
670 }
671
672 static void
link_elf_invoke_dtors(linker_file_t lf)673 link_elf_invoke_dtors(linker_file_t lf)
674 {
675 KASSERT(lf->ctors_invoked != LF_DTORS,
676 ("%s: file %s ctor state %d",
677 __func__, lf->filename, lf->ctors_invoked));
678
679 if (lf->ctors_invoked == LF_CTORS) {
680 link_elf_invoke_cbs(lf->dtors_addr, lf->dtors_size);
681 lf->ctors_invoked = LF_DTORS;
682 }
683 }
684
685 static int
link_elf_link_preload_finish(linker_file_t lf)686 link_elf_link_preload_finish(linker_file_t lf)
687 {
688 elf_file_t ef;
689 int error;
690
691 ef = (elf_file_t)lf;
692 error = relocate_file(ef);
693 if (error)
694 return (error);
695
696 /* Notify MD code that a module is being loaded. */
697 error = elf_cpu_load_file(lf);
698 if (error)
699 return (error);
700
701 #if defined(__i386__) || defined(__amd64__)
702 /* Now ifuncs. */
703 error = link_elf_reloc_local(lf, true);
704 if (error != 0)
705 return (error);
706 #endif
707
708 /* Apply protections now that relocation processing is complete. */
709 link_elf_protect(ef);
710
711 link_elf_invoke_ctors(lf);
712 return (0);
713 }
714
715 static int
link_elf_load_file(linker_class_t cls,const char * filename,linker_file_t * result)716 link_elf_load_file(linker_class_t cls, const char *filename,
717 linker_file_t *result)
718 {
719 struct nameidata *nd;
720 struct thread *td = curthread; /* XXX */
721 Elf_Ehdr *hdr;
722 Elf_Shdr *shdr;
723 Elf_Sym *es;
724 int nbytes, i, j;
725 vm_offset_t mapbase;
726 size_t mapsize;
727 int error = 0;
728 ssize_t resid;
729 int flags;
730 elf_file_t ef;
731 linker_file_t lf;
732 int symtabindex;
733 int symstrindex;
734 int shstrindex;
735 int nsym;
736 int pb, rl, ra;
737 int alignmask;
738
739 shdr = NULL;
740 lf = NULL;
741 mapsize = 0;
742 hdr = NULL;
743
744 nd = malloc(sizeof(struct nameidata), M_TEMP, M_WAITOK);
745 NDINIT(nd, LOOKUP, FOLLOW, UIO_SYSSPACE, filename);
746 flags = FREAD;
747 error = vn_open(nd, &flags, 0, NULL);
748 if (error) {
749 free(nd, M_TEMP);
750 return error;
751 }
752 NDFREE_PNBUF(nd);
753 if (nd->ni_vp->v_type != VREG) {
754 error = ENOEXEC;
755 goto out;
756 }
757 #ifdef MAC
758 error = mac_kld_check_load(td->td_ucred, nd->ni_vp);
759 if (error) {
760 goto out;
761 }
762 #endif
763
764 /* Read the elf header from the file. */
765 hdr = malloc(sizeof(*hdr), M_LINKER, M_WAITOK);
766 error = vn_rdwr(UIO_READ, nd->ni_vp, (void *)hdr, sizeof(*hdr), 0,
767 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
768 &resid, td);
769 if (error)
770 goto out;
771 if (resid != 0){
772 error = ENOEXEC;
773 goto out;
774 }
775
776 if (!IS_ELF(*hdr)) {
777 error = ENOEXEC;
778 goto out;
779 }
780
781 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS
782 || hdr->e_ident[EI_DATA] != ELF_TARG_DATA) {
783 link_elf_error(filename, "Unsupported file layout");
784 error = ENOEXEC;
785 goto out;
786 }
787 if (hdr->e_ident[EI_VERSION] != EV_CURRENT
788 || hdr->e_version != EV_CURRENT) {
789 link_elf_error(filename, "Unsupported file version");
790 error = ENOEXEC;
791 goto out;
792 }
793 if (hdr->e_type != ET_REL) {
794 error = ENOSYS;
795 goto out;
796 }
797 if (hdr->e_machine != ELF_TARG_MACH) {
798 link_elf_error(filename, "Unsupported machine");
799 error = ENOEXEC;
800 goto out;
801 }
802
803 lf = linker_make_file(filename, &link_elf_class);
804 if (!lf) {
805 error = ENOMEM;
806 goto out;
807 }
808 ef = (elf_file_t) lf;
809 ef->nprogtab = 0;
810 ef->e_shdr = 0;
811 ef->nreltab = 0;
812 ef->nrelatab = 0;
813
814 /* Allocate and read in the section header */
815 nbytes = hdr->e_shnum * hdr->e_shentsize;
816 if (nbytes == 0 || hdr->e_shoff == 0 ||
817 hdr->e_shentsize != sizeof(Elf_Shdr)) {
818 error = ENOEXEC;
819 goto out;
820 }
821 shdr = malloc(nbytes, M_LINKER, M_WAITOK);
822 ef->e_shdr = shdr;
823 error = vn_rdwr(UIO_READ, nd->ni_vp, (caddr_t)shdr, nbytes,
824 hdr->e_shoff, UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
825 NOCRED, &resid, td);
826 if (error)
827 goto out;
828 if (resid) {
829 error = ENOEXEC;
830 goto out;
831 }
832
833 /* Scan the section header for information and table sizing. */
834 nsym = 0;
835 symtabindex = -1;
836 symstrindex = -1;
837 for (i = 0; i < hdr->e_shnum; i++) {
838 if (shdr[i].sh_size == 0)
839 continue;
840 switch (shdr[i].sh_type) {
841 case SHT_PROGBITS:
842 case SHT_NOBITS:
843 #ifdef __amd64__
844 case SHT_X86_64_UNWIND:
845 #endif
846 case SHT_INIT_ARRAY:
847 case SHT_FINI_ARRAY:
848 if ((shdr[i].sh_flags & SHF_ALLOC) == 0)
849 break;
850 ef->nprogtab++;
851 break;
852 case SHT_SYMTAB:
853 nsym++;
854 symtabindex = i;
855 symstrindex = shdr[i].sh_link;
856 break;
857 case SHT_REL:
858 /*
859 * Ignore relocation tables for unallocated
860 * sections.
861 */
862 if ((shdr[shdr[i].sh_info].sh_flags & SHF_ALLOC) == 0)
863 break;
864 ef->nreltab++;
865 break;
866 case SHT_RELA:
867 if ((shdr[shdr[i].sh_info].sh_flags & SHF_ALLOC) == 0)
868 break;
869 ef->nrelatab++;
870 break;
871 case SHT_STRTAB:
872 break;
873 }
874 }
875 if (ef->nprogtab == 0) {
876 link_elf_error(filename, "file has no contents");
877 error = ENOEXEC;
878 goto out;
879 }
880 if (nsym != 1) {
881 /* Only allow one symbol table for now */
882 link_elf_error(filename,
883 "file must have exactly one symbol table");
884 error = ENOEXEC;
885 goto out;
886 }
887 if (symstrindex < 0 || symstrindex > hdr->e_shnum ||
888 shdr[symstrindex].sh_type != SHT_STRTAB) {
889 link_elf_error(filename, "file has invalid symbol strings");
890 error = ENOEXEC;
891 goto out;
892 }
893
894 /* Allocate space for tracking the load chunks */
895 if (ef->nprogtab != 0)
896 ef->progtab = malloc(ef->nprogtab * sizeof(*ef->progtab),
897 M_LINKER, M_WAITOK | M_ZERO);
898 if (ef->nreltab != 0)
899 ef->reltab = malloc(ef->nreltab * sizeof(*ef->reltab),
900 M_LINKER, M_WAITOK | M_ZERO);
901 if (ef->nrelatab != 0)
902 ef->relatab = malloc(ef->nrelatab * sizeof(*ef->relatab),
903 M_LINKER, M_WAITOK | M_ZERO);
904
905 if (symtabindex == -1) {
906 link_elf_error(filename, "lost symbol table index");
907 error = ENOEXEC;
908 goto out;
909 }
910 /* Allocate space for and load the symbol table */
911 ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
912 ef->ddbsymtab = malloc(shdr[symtabindex].sh_size, M_LINKER, M_WAITOK);
913 error = vn_rdwr(UIO_READ, nd->ni_vp, (void *)ef->ddbsymtab,
914 shdr[symtabindex].sh_size, shdr[symtabindex].sh_offset,
915 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
916 &resid, td);
917 if (error)
918 goto out;
919 if (resid != 0){
920 error = EINVAL;
921 goto out;
922 }
923
924 /* Allocate space for and load the symbol strings */
925 ef->ddbstrcnt = shdr[symstrindex].sh_size;
926 ef->ddbstrtab = malloc(shdr[symstrindex].sh_size, M_LINKER, M_WAITOK);
927 error = vn_rdwr(UIO_READ, nd->ni_vp, ef->ddbstrtab,
928 shdr[symstrindex].sh_size, shdr[symstrindex].sh_offset,
929 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
930 &resid, td);
931 if (error)
932 goto out;
933 if (resid != 0){
934 error = EINVAL;
935 goto out;
936 }
937
938 /* Do we have a string table for the section names? */
939 shstrindex = -1;
940 if (hdr->e_shstrndx != 0 &&
941 shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) {
942 shstrindex = hdr->e_shstrndx;
943 ef->shstrcnt = shdr[shstrindex].sh_size;
944 ef->shstrtab = malloc(shdr[shstrindex].sh_size, M_LINKER,
945 M_WAITOK);
946 error = vn_rdwr(UIO_READ, nd->ni_vp, ef->shstrtab,
947 shdr[shstrindex].sh_size, shdr[shstrindex].sh_offset,
948 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
949 &resid, td);
950 if (error)
951 goto out;
952 if (resid != 0){
953 error = EINVAL;
954 goto out;
955 }
956 }
957
958 /* Size up code/data(progbits) and bss(nobits). */
959 alignmask = 0;
960 for (i = 0; i < hdr->e_shnum; i++) {
961 if (shdr[i].sh_size == 0)
962 continue;
963 switch (shdr[i].sh_type) {
964 case SHT_PROGBITS:
965 case SHT_NOBITS:
966 #ifdef __amd64__
967 case SHT_X86_64_UNWIND:
968 #endif
969 case SHT_INIT_ARRAY:
970 case SHT_FINI_ARRAY:
971 if ((shdr[i].sh_flags & SHF_ALLOC) == 0)
972 break;
973 alignmask = shdr[i].sh_addralign - 1;
974 mapsize += alignmask;
975 mapsize &= ~alignmask;
976 mapsize += shdr[i].sh_size;
977 break;
978 }
979 }
980
981 /*
982 * We know how much space we need for the text/data/bss/etc.
983 * This stuff needs to be in a single chunk so that profiling etc
984 * can get the bounds and gdb can associate offsets with modules
985 */
986 ef->object = vm_pager_allocate(OBJT_PHYS, NULL, round_page(mapsize),
987 VM_PROT_ALL, 0, thread0.td_ucred);
988 if (ef->object == NULL) {
989 error = ENOMEM;
990 goto out;
991 }
992 #if VM_NRESERVLEVEL > 0
993 vm_object_color(ef->object, 0);
994 #endif
995
996 /*
997 * In order to satisfy amd64's architectural requirements on the
998 * location of code and data in the kernel's address space, request a
999 * mapping that is above the kernel.
1000 *
1001 * Protections will be restricted once relocations are applied.
1002 */
1003 #ifdef __amd64__
1004 mapbase = KERNBASE;
1005 #else
1006 mapbase = VM_MIN_KERNEL_ADDRESS;
1007 #endif
1008 error = vm_map_find(kernel_map, ef->object, 0, &mapbase,
1009 round_page(mapsize), 0, VMFS_OPTIMAL_SPACE, VM_PROT_ALL,
1010 VM_PROT_ALL, 0);
1011 if (error != KERN_SUCCESS) {
1012 vm_object_deallocate(ef->object);
1013 ef->object = NULL;
1014 error = ENOMEM;
1015 goto out;
1016 }
1017
1018 /* Wire the pages */
1019 error = vm_map_wire(kernel_map, mapbase,
1020 mapbase + round_page(mapsize),
1021 VM_MAP_WIRE_SYSTEM|VM_MAP_WIRE_NOHOLES);
1022 if (error != KERN_SUCCESS) {
1023 error = ENOMEM;
1024 goto out;
1025 }
1026
1027 /* Inform the kld system about the situation */
1028 lf->address = ef->address = (caddr_t)mapbase;
1029 lf->size = mapsize;
1030
1031 /*
1032 * Now load code/data(progbits), zero bss(nobits), allocate space for
1033 * and load relocs
1034 */
1035 pb = 0;
1036 rl = 0;
1037 ra = 0;
1038 alignmask = 0;
1039 for (i = 0; i < hdr->e_shnum; i++) {
1040 if (shdr[i].sh_size == 0)
1041 continue;
1042 switch (shdr[i].sh_type) {
1043 case SHT_PROGBITS:
1044 case SHT_NOBITS:
1045 #ifdef __amd64__
1046 case SHT_X86_64_UNWIND:
1047 #endif
1048 case SHT_INIT_ARRAY:
1049 case SHT_FINI_ARRAY:
1050 if ((shdr[i].sh_flags & SHF_ALLOC) == 0)
1051 break;
1052 alignmask = shdr[i].sh_addralign - 1;
1053 mapbase += alignmask;
1054 mapbase &= ~alignmask;
1055 if (ef->shstrtab != NULL && shdr[i].sh_name != 0) {
1056 ef->progtab[pb].name =
1057 ef->shstrtab + shdr[i].sh_name;
1058 if (!strcmp(ef->progtab[pb].name, ".ctors") ||
1059 shdr[i].sh_type == SHT_INIT_ARRAY) {
1060 if (lf->ctors_addr != 0) {
1061 printf(
1062 "%s: multiple ctor sections in %s\n",
1063 __func__, filename);
1064 } else {
1065 lf->ctors_addr =
1066 (caddr_t)mapbase;
1067 lf->ctors_size =
1068 shdr[i].sh_size;
1069 }
1070 } else if (!strcmp(ef->progtab[pb].name,
1071 ".dtors") ||
1072 shdr[i].sh_type == SHT_FINI_ARRAY) {
1073 if (lf->dtors_addr != 0) {
1074 printf(
1075 "%s: multiple dtor sections in %s\n",
1076 __func__, filename);
1077 } else {
1078 lf->dtors_addr =
1079 (caddr_t)mapbase;
1080 lf->dtors_size =
1081 shdr[i].sh_size;
1082 }
1083 }
1084 } else if (shdr[i].sh_type == SHT_PROGBITS)
1085 ef->progtab[pb].name = "<<PROGBITS>>";
1086 #ifdef __amd64__
1087 else if (shdr[i].sh_type == SHT_X86_64_UNWIND)
1088 ef->progtab[pb].name = "<<UNWIND>>";
1089 #endif
1090 else
1091 ef->progtab[pb].name = "<<NOBITS>>";
1092 if (ef->progtab[pb].name != NULL &&
1093 !strcmp(ef->progtab[pb].name, DPCPU_SETNAME)) {
1094 ef->progtab[pb].addr =
1095 dpcpu_alloc(shdr[i].sh_size);
1096 if (ef->progtab[pb].addr == NULL) {
1097 printf("%s: pcpu module space is out "
1098 "of space; cannot allocate %#jx "
1099 "for %s\n", __func__,
1100 (uintmax_t)shdr[i].sh_size,
1101 filename);
1102 }
1103 }
1104 #ifdef VIMAGE
1105 else if (ef->progtab[pb].name != NULL &&
1106 !strcmp(ef->progtab[pb].name, VNET_SETNAME)) {
1107 ef->progtab[pb].addr =
1108 vnet_data_alloc(shdr[i].sh_size);
1109 if (ef->progtab[pb].addr == NULL) {
1110 printf("%s: vnet module space is out "
1111 "of space; cannot allocate %#jx "
1112 "for %s\n", __func__,
1113 (uintmax_t)shdr[i].sh_size,
1114 filename);
1115 }
1116 }
1117 #endif
1118 else
1119 ef->progtab[pb].addr =
1120 (void *)(uintptr_t)mapbase;
1121 if (ef->progtab[pb].addr == NULL) {
1122 error = ENOSPC;
1123 goto out;
1124 }
1125 ef->progtab[pb].size = shdr[i].sh_size;
1126 ef->progtab[pb].flags = shdr[i].sh_flags;
1127 ef->progtab[pb].sec = i;
1128 if (shdr[i].sh_type == SHT_PROGBITS
1129 #ifdef __amd64__
1130 || shdr[i].sh_type == SHT_X86_64_UNWIND
1131 #endif
1132 ) {
1133 error = vn_rdwr(UIO_READ, nd->ni_vp,
1134 ef->progtab[pb].addr,
1135 shdr[i].sh_size, shdr[i].sh_offset,
1136 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
1137 NOCRED, &resid, td);
1138 if (error)
1139 goto out;
1140 if (resid != 0){
1141 error = EINVAL;
1142 goto out;
1143 }
1144 /* Initialize the per-cpu area. */
1145 if (ef->progtab[pb].addr != (void *)mapbase &&
1146 !strcmp(ef->progtab[pb].name, DPCPU_SETNAME))
1147 dpcpu_copy(ef->progtab[pb].addr,
1148 shdr[i].sh_size);
1149 } else
1150 bzero(ef->progtab[pb].addr, shdr[i].sh_size);
1151
1152 #ifdef VIMAGE
1153 if (ef->progtab[pb].addr != (void *)mapbase &&
1154 strcmp(ef->progtab[pb].name, VNET_SETNAME) == 0)
1155 vnet_save_init(ef->progtab[pb].addr,
1156 ef->progtab[pb].size);
1157 #endif
1158 /* Update all symbol values with the offset. */
1159 for (j = 0; j < ef->ddbsymcnt; j++) {
1160 es = &ef->ddbsymtab[j];
1161 if (es->st_shndx != i)
1162 continue;
1163 es->st_value += (Elf_Addr)ef->progtab[pb].addr;
1164 }
1165 mapbase += shdr[i].sh_size;
1166 pb++;
1167 break;
1168 case SHT_REL:
1169 if ((shdr[shdr[i].sh_info].sh_flags & SHF_ALLOC) == 0)
1170 break;
1171 ef->reltab[rl].rel = malloc(shdr[i].sh_size, M_LINKER,
1172 M_WAITOK);
1173 ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
1174 ef->reltab[rl].sec = shdr[i].sh_info;
1175 error = vn_rdwr(UIO_READ, nd->ni_vp,
1176 (void *)ef->reltab[rl].rel,
1177 shdr[i].sh_size, shdr[i].sh_offset,
1178 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
1179 &resid, td);
1180 if (error)
1181 goto out;
1182 if (resid != 0){
1183 error = EINVAL;
1184 goto out;
1185 }
1186 rl++;
1187 break;
1188 case SHT_RELA:
1189 if ((shdr[shdr[i].sh_info].sh_flags & SHF_ALLOC) == 0)
1190 break;
1191 ef->relatab[ra].rela = malloc(shdr[i].sh_size, M_LINKER,
1192 M_WAITOK);
1193 ef->relatab[ra].nrela =
1194 shdr[i].sh_size / sizeof(Elf_Rela);
1195 ef->relatab[ra].sec = shdr[i].sh_info;
1196 error = vn_rdwr(UIO_READ, nd->ni_vp,
1197 (void *)ef->relatab[ra].rela,
1198 shdr[i].sh_size, shdr[i].sh_offset,
1199 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
1200 &resid, td);
1201 if (error)
1202 goto out;
1203 if (resid != 0){
1204 error = EINVAL;
1205 goto out;
1206 }
1207 ra++;
1208 break;
1209 }
1210 }
1211 if (pb != ef->nprogtab) {
1212 link_elf_error(filename, "lost progbits");
1213 error = ENOEXEC;
1214 goto out;
1215 }
1216 if (rl != ef->nreltab) {
1217 link_elf_error(filename, "lost reltab");
1218 error = ENOEXEC;
1219 goto out;
1220 }
1221 if (ra != ef->nrelatab) {
1222 link_elf_error(filename, "lost relatab");
1223 error = ENOEXEC;
1224 goto out;
1225 }
1226 if (mapbase != (vm_offset_t)ef->address + mapsize) {
1227 printf(
1228 "%s: mapbase 0x%lx != address %p + mapsize 0x%lx (0x%lx)\n",
1229 filename != NULL ? filename : "<none>",
1230 (u_long)mapbase, ef->address, (u_long)mapsize,
1231 (u_long)(vm_offset_t)ef->address + mapsize);
1232 error = ENOMEM;
1233 goto out;
1234 }
1235
1236 /* Local intra-module relocations */
1237 error = link_elf_reloc_local(lf, false);
1238 if (error != 0)
1239 goto out;
1240
1241 /* Pull in dependencies */
1242 VOP_UNLOCK(nd->ni_vp);
1243 error = linker_load_dependencies(lf);
1244 vn_lock(nd->ni_vp, LK_EXCLUSIVE | LK_RETRY);
1245 if (error)
1246 goto out;
1247
1248 /* External relocations */
1249 error = relocate_file(ef);
1250 if (error)
1251 goto out;
1252
1253 /* Notify MD code that a module is being loaded. */
1254 error = elf_cpu_load_file(lf);
1255 if (error)
1256 goto out;
1257
1258 #if defined(__i386__) || defined(__amd64__)
1259 /* Now ifuncs. */
1260 error = link_elf_reloc_local(lf, true);
1261 if (error != 0)
1262 goto out;
1263 #endif
1264
1265 link_elf_protect(ef);
1266 link_elf_invoke_ctors(lf);
1267 *result = lf;
1268
1269 out:
1270 VOP_UNLOCK(nd->ni_vp);
1271 vn_close(nd->ni_vp, FREAD, td->td_ucred, td);
1272 free(nd, M_TEMP);
1273 if (error && lf)
1274 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1275 free(hdr, M_LINKER);
1276
1277 return error;
1278 }
1279
1280 static void
link_elf_unload_file(linker_file_t file)1281 link_elf_unload_file(linker_file_t file)
1282 {
1283 elf_file_t ef = (elf_file_t) file;
1284 u_int i;
1285
1286 link_elf_invoke_dtors(file);
1287
1288 /* Notify MD code that a module is being unloaded. */
1289 elf_cpu_unload_file(file);
1290
1291 if (ef->progtab) {
1292 for (i = 0; i < ef->nprogtab; i++) {
1293 if (ef->progtab[i].size == 0)
1294 continue;
1295 if (ef->progtab[i].name == NULL)
1296 continue;
1297 if (!strcmp(ef->progtab[i].name, DPCPU_SETNAME))
1298 dpcpu_free(ef->progtab[i].addr,
1299 ef->progtab[i].size);
1300 #ifdef VIMAGE
1301 else if (!strcmp(ef->progtab[i].name, VNET_SETNAME))
1302 vnet_data_free(ef->progtab[i].addr,
1303 ef->progtab[i].size);
1304 #endif
1305 }
1306 }
1307 if (ef->preloaded) {
1308 free(ef->reltab, M_LINKER);
1309 free(ef->relatab, M_LINKER);
1310 free(ef->progtab, M_LINKER);
1311 free(ef->ctftab, M_LINKER);
1312 free(ef->ctfoff, M_LINKER);
1313 free(ef->typoff, M_LINKER);
1314 if (file->pathname != NULL)
1315 preload_delete_name(file->pathname);
1316 return;
1317 }
1318
1319 for (i = 0; i < ef->nreltab; i++)
1320 free(ef->reltab[i].rel, M_LINKER);
1321 for (i = 0; i < ef->nrelatab; i++)
1322 free(ef->relatab[i].rela, M_LINKER);
1323 free(ef->reltab, M_LINKER);
1324 free(ef->relatab, M_LINKER);
1325 free(ef->progtab, M_LINKER);
1326
1327 if (ef->object != NULL)
1328 vm_map_remove(kernel_map, (vm_offset_t)ef->address,
1329 (vm_offset_t)ef->address + ptoa(ef->object->size));
1330 free(ef->e_shdr, M_LINKER);
1331 free(ef->ddbsymtab, M_LINKER);
1332 free(ef->ddbstrtab, M_LINKER);
1333 free(ef->shstrtab, M_LINKER);
1334 free(ef->ctftab, M_LINKER);
1335 free(ef->ctfoff, M_LINKER);
1336 free(ef->typoff, M_LINKER);
1337 }
1338
1339 static const char *
symbol_name(elf_file_t ef,Elf_Size r_info)1340 symbol_name(elf_file_t ef, Elf_Size r_info)
1341 {
1342 const Elf_Sym *ref;
1343
1344 if (ELF_R_SYM(r_info)) {
1345 ref = ef->ddbsymtab + ELF_R_SYM(r_info);
1346 return ef->ddbstrtab + ref->st_name;
1347 } else
1348 return NULL;
1349 }
1350
1351 static Elf_Addr
findbase(elf_file_t ef,int sec)1352 findbase(elf_file_t ef, int sec)
1353 {
1354 int i;
1355 Elf_Addr base = 0;
1356
1357 for (i = 0; i < ef->nprogtab; i++) {
1358 if (sec == ef->progtab[i].sec) {
1359 base = (Elf_Addr)ef->progtab[i].addr;
1360 break;
1361 }
1362 }
1363 return base;
1364 }
1365
1366 static int
relocate_file1(elf_file_t ef,bool ifuncs)1367 relocate_file1(elf_file_t ef, bool ifuncs)
1368 {
1369 const Elf_Rel *rellim;
1370 const Elf_Rel *rel;
1371 const Elf_Rela *relalim;
1372 const Elf_Rela *rela;
1373 const char *symname;
1374 const Elf_Sym *sym;
1375 int i;
1376 Elf_Size symidx;
1377 Elf_Addr base;
1378
1379 /* Perform relocations without addend if there are any: */
1380 for (i = 0; i < ef->nreltab; i++) {
1381 rel = ef->reltab[i].rel;
1382 if (rel == NULL) {
1383 link_elf_error(ef->lf.filename, "lost a reltab!");
1384 return (ENOEXEC);
1385 }
1386 rellim = rel + ef->reltab[i].nrel;
1387 base = findbase(ef, ef->reltab[i].sec);
1388 if (base == 0) {
1389 link_elf_error(ef->lf.filename, "lost base for reltab");
1390 return (ENOEXEC);
1391 }
1392 for ( ; rel < rellim; rel++) {
1393 symidx = ELF_R_SYM(rel->r_info);
1394 if (symidx >= ef->ddbsymcnt)
1395 continue;
1396 sym = ef->ddbsymtab + symidx;
1397 /* Local relocs are already done */
1398 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
1399 continue;
1400 if ((ELF_ST_TYPE(sym->st_info) == STT_GNU_IFUNC ||
1401 elf_is_ifunc_reloc(rel->r_info)) != ifuncs)
1402 continue;
1403 if (elf_reloc(&ef->lf, base, rel, ELF_RELOC_REL,
1404 elf_obj_lookup)) {
1405 symname = symbol_name(ef, rel->r_info);
1406 printf("link_elf_obj: symbol %s undefined\n",
1407 symname);
1408 return (ENOENT);
1409 }
1410 }
1411 }
1412
1413 /* Perform relocations with addend if there are any: */
1414 for (i = 0; i < ef->nrelatab; i++) {
1415 rela = ef->relatab[i].rela;
1416 if (rela == NULL) {
1417 link_elf_error(ef->lf.filename, "lost a relatab!");
1418 return (ENOEXEC);
1419 }
1420 relalim = rela + ef->relatab[i].nrela;
1421 base = findbase(ef, ef->relatab[i].sec);
1422 if (base == 0) {
1423 link_elf_error(ef->lf.filename,
1424 "lost base for relatab");
1425 return (ENOEXEC);
1426 }
1427 for ( ; rela < relalim; rela++) {
1428 symidx = ELF_R_SYM(rela->r_info);
1429 if (symidx >= ef->ddbsymcnt)
1430 continue;
1431 sym = ef->ddbsymtab + symidx;
1432 /* Local relocs are already done */
1433 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
1434 continue;
1435 if ((ELF_ST_TYPE(sym->st_info) == STT_GNU_IFUNC ||
1436 elf_is_ifunc_reloc(rela->r_info)) != ifuncs)
1437 continue;
1438 if (elf_reloc(&ef->lf, base, rela, ELF_RELOC_RELA,
1439 elf_obj_lookup)) {
1440 symname = symbol_name(ef, rela->r_info);
1441 printf("link_elf_obj: symbol %s undefined\n",
1442 symname);
1443 return (ENOENT);
1444 }
1445 }
1446 }
1447
1448 /*
1449 * Only clean SHN_FBSD_CACHED for successful return. If we
1450 * modified symbol table for the object but found an
1451 * unresolved symbol, there is no reason to roll back.
1452 */
1453 elf_obj_cleanup_globals_cache(ef);
1454
1455 return (0);
1456 }
1457
1458 static int
relocate_file(elf_file_t ef)1459 relocate_file(elf_file_t ef)
1460 {
1461 int error;
1462
1463 error = relocate_file1(ef, false);
1464 if (error == 0)
1465 error = relocate_file1(ef, true);
1466 return (error);
1467 }
1468
1469 static int
link_elf_lookup_symbol1(linker_file_t lf,const char * name,c_linker_sym_t * sym,bool see_local)1470 link_elf_lookup_symbol1(linker_file_t lf, const char *name, c_linker_sym_t *sym,
1471 bool see_local)
1472 {
1473 elf_file_t ef = (elf_file_t)lf;
1474 const Elf_Sym *symp;
1475 const char *strp;
1476 int i;
1477
1478 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1479 strp = ef->ddbstrtab + symp->st_name;
1480 if (symp->st_shndx != SHN_UNDEF && strcmp(name, strp) == 0) {
1481 if (see_local ||
1482 ELF_ST_BIND(symp->st_info) == STB_GLOBAL) {
1483 *sym = (c_linker_sym_t) symp;
1484 return (0);
1485 }
1486 return (ENOENT);
1487 }
1488 }
1489 return (ENOENT);
1490 }
1491
1492 static int
link_elf_lookup_symbol(linker_file_t lf,const char * name,c_linker_sym_t * sym)1493 link_elf_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym)
1494 {
1495 return (link_elf_lookup_symbol1(lf, name, sym,
1496 link_elf_obj_leak_locals));
1497 }
1498
1499 static int
link_elf_lookup_debug_symbol(linker_file_t lf,const char * name,c_linker_sym_t * sym)1500 link_elf_lookup_debug_symbol(linker_file_t lf, const char *name,
1501 c_linker_sym_t *sym)
1502 {
1503 return (link_elf_lookup_symbol1(lf, name, sym, true));
1504 }
1505
1506 static int
link_elf_lookup_debug_symbol_ctf(linker_file_t lf,const char * name,c_linker_sym_t * sym,linker_ctf_t * lc)1507 link_elf_lookup_debug_symbol_ctf(linker_file_t lf, const char *name,
1508 c_linker_sym_t *sym, linker_ctf_t *lc)
1509 {
1510 if (link_elf_lookup_debug_symbol(lf, name, sym))
1511 return (ENOENT);
1512
1513 return (link_elf_ctf_get_ddb(lf, lc));
1514 }
1515
1516 static int
link_elf_symbol_values1(linker_file_t lf,c_linker_sym_t sym,linker_symval_t * symval,bool see_local)1517 link_elf_symbol_values1(linker_file_t lf, c_linker_sym_t sym,
1518 linker_symval_t *symval, bool see_local)
1519 {
1520 elf_file_t ef;
1521 const Elf_Sym *es;
1522 caddr_t val;
1523
1524 ef = (elf_file_t) lf;
1525 es = (const Elf_Sym*) sym;
1526 val = (caddr_t)es->st_value;
1527 if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) {
1528 if (!see_local && ELF_ST_BIND(es->st_info) == STB_LOCAL)
1529 return (ENOENT);
1530 symval->name = ef->ddbstrtab + es->st_name;
1531 val = (caddr_t)es->st_value;
1532 if (ELF_ST_TYPE(es->st_info) == STT_GNU_IFUNC)
1533 val = ((caddr_t (*)(void))val)();
1534 symval->value = val;
1535 symval->size = es->st_size;
1536 return (0);
1537 }
1538 return (ENOENT);
1539 }
1540
1541 static int
link_elf_symbol_values(linker_file_t lf,c_linker_sym_t sym,linker_symval_t * symval)1542 link_elf_symbol_values(linker_file_t lf, c_linker_sym_t sym,
1543 linker_symval_t *symval)
1544 {
1545 return (link_elf_symbol_values1(lf, sym, symval,
1546 link_elf_obj_leak_locals));
1547 }
1548
1549 static int
link_elf_debug_symbol_values(linker_file_t lf,c_linker_sym_t sym,linker_symval_t * symval)1550 link_elf_debug_symbol_values(linker_file_t lf, c_linker_sym_t sym,
1551 linker_symval_t *symval)
1552 {
1553 return (link_elf_symbol_values1(lf, sym, symval, true));
1554 }
1555
1556 static int
link_elf_search_symbol(linker_file_t lf,caddr_t value,c_linker_sym_t * sym,long * diffp)1557 link_elf_search_symbol(linker_file_t lf, caddr_t value,
1558 c_linker_sym_t *sym, long *diffp)
1559 {
1560 elf_file_t ef = (elf_file_t)lf;
1561 u_long off = (uintptr_t)(void *)value;
1562 u_long diff = off;
1563 u_long st_value;
1564 const Elf_Sym *es;
1565 const Elf_Sym *best = NULL;
1566 int i;
1567
1568 for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) {
1569 if (es->st_name == 0)
1570 continue;
1571 st_value = es->st_value;
1572 if (off >= st_value) {
1573 if (off - st_value < diff) {
1574 diff = off - st_value;
1575 best = es;
1576 if (diff == 0)
1577 break;
1578 } else if (off - st_value == diff) {
1579 best = es;
1580 }
1581 }
1582 }
1583 if (best == NULL)
1584 *diffp = off;
1585 else
1586 *diffp = diff;
1587 *sym = (c_linker_sym_t) best;
1588
1589 return (0);
1590 }
1591
1592 /*
1593 * Look up a linker set on an ELF system.
1594 */
1595 static int
link_elf_lookup_set(linker_file_t lf,const char * name,void *** startp,void *** stopp,int * countp)1596 link_elf_lookup_set(linker_file_t lf, const char *name,
1597 void ***startp, void ***stopp, int *countp)
1598 {
1599 elf_file_t ef = (elf_file_t)lf;
1600 void **start, **stop;
1601 int i, count;
1602
1603 /* Relative to section number */
1604 for (i = 0; i < ef->nprogtab; i++) {
1605 if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) &&
1606 strcmp(ef->progtab[i].name + 4, name) == 0) {
1607 start = (void **)ef->progtab[i].addr;
1608 stop = (void **)((char *)ef->progtab[i].addr +
1609 ef->progtab[i].size);
1610 count = stop - start;
1611 if (startp)
1612 *startp = start;
1613 if (stopp)
1614 *stopp = stop;
1615 if (countp)
1616 *countp = count;
1617 return (0);
1618 }
1619 }
1620 return (ESRCH);
1621 }
1622
1623 static int
link_elf_each_function_name(linker_file_t file,int (* callback)(const char *,void *),void * opaque)1624 link_elf_each_function_name(linker_file_t file,
1625 int (*callback)(const char *, void *), void *opaque)
1626 {
1627 elf_file_t ef = (elf_file_t)file;
1628 const Elf_Sym *symp;
1629 int i, error;
1630
1631 /* Exhaustive search */
1632 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1633 if (symp->st_value != 0 &&
1634 (ELF_ST_TYPE(symp->st_info) == STT_FUNC ||
1635 ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC)) {
1636 error = callback(ef->ddbstrtab + symp->st_name, opaque);
1637 if (error)
1638 return (error);
1639 }
1640 }
1641 return (0);
1642 }
1643
1644 static int
link_elf_each_function_nameval(linker_file_t file,linker_function_nameval_callback_t callback,void * opaque)1645 link_elf_each_function_nameval(linker_file_t file,
1646 linker_function_nameval_callback_t callback, void *opaque)
1647 {
1648 linker_symval_t symval;
1649 elf_file_t ef = (elf_file_t)file;
1650 const Elf_Sym *symp;
1651 int i, error;
1652
1653 /* Exhaustive search */
1654 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1655 if (symp->st_value != 0 &&
1656 (ELF_ST_TYPE(symp->st_info) == STT_FUNC ||
1657 ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC)) {
1658 error = link_elf_debug_symbol_values(file,
1659 (c_linker_sym_t)symp, &symval);
1660 if (error == 0)
1661 error = callback(file, i, &symval, opaque);
1662 if (error != 0)
1663 return (error);
1664 }
1665 }
1666 return (0);
1667 }
1668
1669 static void
elf_obj_cleanup_globals_cache(elf_file_t ef)1670 elf_obj_cleanup_globals_cache(elf_file_t ef)
1671 {
1672 Elf_Sym *sym;
1673 Elf_Size i;
1674
1675 for (i = 0; i < ef->ddbsymcnt; i++) {
1676 sym = ef->ddbsymtab + i;
1677 if (sym->st_shndx == SHN_FBSD_CACHED) {
1678 sym->st_shndx = SHN_UNDEF;
1679 sym->st_value = 0;
1680 }
1681 }
1682 }
1683
1684 /*
1685 * Symbol lookup function that can be used when the symbol index is known (ie
1686 * in relocations). It uses the symbol index instead of doing a fully fledged
1687 * hash table based lookup when such is valid. For example for local symbols.
1688 * This is not only more efficient, it's also more correct. It's not always
1689 * the case that the symbol can be found through the hash table.
1690 */
1691 static int
elf_obj_lookup(linker_file_t lf,Elf_Size symidx,int deps,Elf_Addr * res)1692 elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *res)
1693 {
1694 elf_file_t ef = (elf_file_t)lf;
1695 Elf_Sym *sym;
1696 const char *symbol;
1697 Elf_Addr res1;
1698
1699 /* Don't even try to lookup the symbol if the index is bogus. */
1700 if (symidx >= ef->ddbsymcnt) {
1701 *res = 0;
1702 return (EINVAL);
1703 }
1704
1705 sym = ef->ddbsymtab + symidx;
1706
1707 /* Quick answer if there is a definition included. */
1708 if (sym->st_shndx != SHN_UNDEF) {
1709 res1 = (Elf_Addr)sym->st_value;
1710 if (ELF_ST_TYPE(sym->st_info) == STT_GNU_IFUNC)
1711 res1 = ((Elf_Addr (*)(void))res1)();
1712 *res = res1;
1713 return (0);
1714 }
1715
1716 /* If we get here, then it is undefined and needs a lookup. */
1717 switch (ELF_ST_BIND(sym->st_info)) {
1718 case STB_LOCAL:
1719 /* Local, but undefined? huh? */
1720 *res = 0;
1721 return (EINVAL);
1722
1723 case STB_GLOBAL:
1724 case STB_WEAK:
1725 /* Relative to Data or Function name */
1726 symbol = ef->ddbstrtab + sym->st_name;
1727
1728 /* Force a lookup failure if the symbol name is bogus. */
1729 if (*symbol == 0) {
1730 *res = 0;
1731 return (EINVAL);
1732 }
1733 res1 = (Elf_Addr)linker_file_lookup_symbol(lf, symbol, deps);
1734
1735 /*
1736 * Cache global lookups during module relocation. The failure
1737 * case is particularly expensive for callers, who must scan
1738 * through the entire globals table doing strcmp(). Cache to
1739 * avoid doing such work repeatedly.
1740 *
1741 * After relocation is complete, undefined globals will be
1742 * restored to SHN_UNDEF in elf_obj_cleanup_globals_cache(),
1743 * above.
1744 */
1745 if (res1 != 0) {
1746 sym->st_shndx = SHN_FBSD_CACHED;
1747 sym->st_value = res1;
1748 *res = res1;
1749 return (0);
1750 } else if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1751 sym->st_value = 0;
1752 *res = 0;
1753 return (0);
1754 }
1755 return (EINVAL);
1756
1757 default:
1758 return (EINVAL);
1759 }
1760 }
1761
1762 static void
link_elf_fix_link_set(elf_file_t ef)1763 link_elf_fix_link_set(elf_file_t ef)
1764 {
1765 static const char startn[] = "__start_";
1766 static const char stopn[] = "__stop_";
1767 Elf_Sym *sym;
1768 const char *sym_name, *linkset_name;
1769 Elf_Addr startp, stopp;
1770 Elf_Size symidx;
1771 int start, i;
1772
1773 startp = stopp = 0;
1774 for (symidx = 1 /* zero entry is special */;
1775 symidx < ef->ddbsymcnt; symidx++) {
1776 sym = ef->ddbsymtab + symidx;
1777 if (sym->st_shndx != SHN_UNDEF)
1778 continue;
1779
1780 sym_name = ef->ddbstrtab + sym->st_name;
1781 if (strncmp(sym_name, startn, sizeof(startn) - 1) == 0) {
1782 start = 1;
1783 linkset_name = sym_name + sizeof(startn) - 1;
1784 }
1785 else if (strncmp(sym_name, stopn, sizeof(stopn) - 1) == 0) {
1786 start = 0;
1787 linkset_name = sym_name + sizeof(stopn) - 1;
1788 }
1789 else
1790 continue;
1791
1792 for (i = 0; i < ef->nprogtab; i++) {
1793 if (strcmp(ef->progtab[i].name, linkset_name) == 0) {
1794 startp = (Elf_Addr)ef->progtab[i].addr;
1795 stopp = (Elf_Addr)(startp + ef->progtab[i].size);
1796 break;
1797 }
1798 }
1799 if (i == ef->nprogtab)
1800 continue;
1801
1802 sym->st_value = start ? startp : stopp;
1803 sym->st_shndx = i;
1804 }
1805 }
1806
1807 static int
link_elf_reloc_local(linker_file_t lf,bool ifuncs)1808 link_elf_reloc_local(linker_file_t lf, bool ifuncs)
1809 {
1810 elf_file_t ef = (elf_file_t)lf;
1811 const Elf_Rel *rellim;
1812 const Elf_Rel *rel;
1813 const Elf_Rela *relalim;
1814 const Elf_Rela *rela;
1815 const Elf_Sym *sym;
1816 Elf_Addr base;
1817 int i;
1818 Elf_Size symidx;
1819
1820 link_elf_fix_link_set(ef);
1821
1822 /* Perform relocations without addend if there are any: */
1823 for (i = 0; i < ef->nreltab; i++) {
1824 rel = ef->reltab[i].rel;
1825 if (rel == NULL) {
1826 link_elf_error(ef->lf.filename, "lost a reltab");
1827 return (ENOEXEC);
1828 }
1829 rellim = rel + ef->reltab[i].nrel;
1830 base = findbase(ef, ef->reltab[i].sec);
1831 if (base == 0) {
1832 link_elf_error(ef->lf.filename, "lost base for reltab");
1833 return (ENOEXEC);
1834 }
1835 for ( ; rel < rellim; rel++) {
1836 symidx = ELF_R_SYM(rel->r_info);
1837 if (symidx >= ef->ddbsymcnt)
1838 continue;
1839 sym = ef->ddbsymtab + symidx;
1840 /* Only do local relocs */
1841 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1842 continue;
1843 if ((ELF_ST_TYPE(sym->st_info) == STT_GNU_IFUNC ||
1844 elf_is_ifunc_reloc(rel->r_info)) != ifuncs)
1845 continue;
1846 if (elf_reloc_local(lf, base, rel, ELF_RELOC_REL,
1847 elf_obj_lookup) != 0)
1848 return (ENOEXEC);
1849 }
1850 }
1851
1852 /* Perform relocations with addend if there are any: */
1853 for (i = 0; i < ef->nrelatab; i++) {
1854 rela = ef->relatab[i].rela;
1855 if (rela == NULL) {
1856 link_elf_error(ef->lf.filename, "lost a relatab!");
1857 return (ENOEXEC);
1858 }
1859 relalim = rela + ef->relatab[i].nrela;
1860 base = findbase(ef, ef->relatab[i].sec);
1861 if (base == 0) {
1862 link_elf_error(ef->lf.filename, "lost base for reltab");
1863 return (ENOEXEC);
1864 }
1865 for ( ; rela < relalim; rela++) {
1866 symidx = ELF_R_SYM(rela->r_info);
1867 if (symidx >= ef->ddbsymcnt)
1868 continue;
1869 sym = ef->ddbsymtab + symidx;
1870 /* Only do local relocs */
1871 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1872 continue;
1873 if ((ELF_ST_TYPE(sym->st_info) == STT_GNU_IFUNC ||
1874 elf_is_ifunc_reloc(rela->r_info)) != ifuncs)
1875 continue;
1876 if (elf_reloc_local(lf, base, rela, ELF_RELOC_RELA,
1877 elf_obj_lookup) != 0)
1878 return (ENOEXEC);
1879 }
1880 }
1881 return (0);
1882 }
1883
1884 static long
link_elf_symtab_get(linker_file_t lf,const Elf_Sym ** symtab)1885 link_elf_symtab_get(linker_file_t lf, const Elf_Sym **symtab)
1886 {
1887 elf_file_t ef = (elf_file_t)lf;
1888
1889 *symtab = ef->ddbsymtab;
1890 if (*symtab == NULL)
1891 return (0);
1892 return (ef->ddbsymcnt);
1893 }
1894
1895 static long
link_elf_strtab_get(linker_file_t lf,caddr_t * strtab)1896 link_elf_strtab_get(linker_file_t lf, caddr_t *strtab)
1897 {
1898 elf_file_t ef = (elf_file_t)lf;
1899
1900 *strtab = ef->ddbstrtab;
1901 if (*strtab == NULL)
1902 return (0);
1903 return (ef->ddbstrcnt);
1904 }
1905
1906 #ifdef VIMAGE
1907 static void
link_elf_propagate_vnets(linker_file_t lf)1908 link_elf_propagate_vnets(linker_file_t lf)
1909 {
1910 elf_file_t ef = (elf_file_t) lf;
1911
1912 if (ef->progtab) {
1913 for (int i = 0; i < ef->nprogtab; i++) {
1914 if (ef->progtab[i].size == 0)
1915 continue;
1916 if (ef->progtab[i].name == NULL)
1917 continue;
1918 if (strcmp(ef->progtab[i].name, VNET_SETNAME) == 0) {
1919 vnet_data_copy(ef->progtab[i].addr,
1920 ef->progtab[i].size);
1921 break;
1922 }
1923 }
1924 }
1925 }
1926 #endif
1927