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 void *origaddr; /* Used by debuggers. */
74 Elf_Off size;
75 int flags; /* Section flags. */
76 int sec; /* Original section number. */
77 char *name;
78 } Elf_progent;
79
80 typedef struct {
81 Elf_Rel *rel;
82 int nrel;
83 int sec;
84 } Elf_relent;
85
86 typedef struct {
87 Elf_Rela *rela;
88 int nrela;
89 int sec;
90 } Elf_relaent;
91
92 typedef struct elf_file {
93 struct linker_file lf; /* Common fields */
94
95 int preloaded;
96 caddr_t address; /* Relocation address */
97 vm_object_t object; /* VM object to hold file pages */
98 Elf_Shdr *e_shdr;
99
100 Elf_progent *progtab;
101 u_int nprogtab;
102
103 Elf_relaent *relatab;
104 u_int nrelatab;
105
106 Elf_relent *reltab;
107 int nreltab;
108
109 Elf_Sym *ddbsymtab; /* The symbol table we are using */
110 long ddbsymcnt; /* Number of symbols */
111 caddr_t ddbstrtab; /* String table */
112 long ddbstrcnt; /* number of bytes in string table */
113
114 caddr_t shstrtab; /* Section name string table */
115 long shstrcnt; /* number of bytes in string table */
116
117 caddr_t ctftab; /* CTF table */
118 long ctfcnt; /* number of bytes in CTF table */
119 caddr_t ctfoff; /* CTF offset table */
120 caddr_t typoff; /* Type offset table */
121 long typlen; /* Number of type entries. */
122
123 } *elf_file_t;
124
125 #include <kern/kern_ctf.c>
126
127 static int link_elf_link_preload(linker_class_t cls,
128 const char *, linker_file_t *);
129 static int link_elf_link_preload_finish(linker_file_t);
130 static int link_elf_load_file(linker_class_t, const char *, linker_file_t *);
131 static int link_elf_lookup_symbol(linker_file_t, const char *,
132 c_linker_sym_t *);
133 static int link_elf_lookup_debug_symbol(linker_file_t, const char *,
134 c_linker_sym_t *);
135 static int link_elf_lookup_debug_symbol_ctf(linker_file_t lf,
136 const char *name, c_linker_sym_t *sym, linker_ctf_t *lc);
137 static int link_elf_symbol_values(linker_file_t, c_linker_sym_t,
138 linker_symval_t *);
139 static int link_elf_debug_symbol_values(linker_file_t, c_linker_sym_t,
140 linker_symval_t *);
141 static int link_elf_search_symbol(linker_file_t, caddr_t value,
142 c_linker_sym_t *sym, long *diffp);
143
144 static void link_elf_unload_file(linker_file_t);
145 static int link_elf_lookup_set(linker_file_t, const char *,
146 void ***, void ***, int *);
147 static int link_elf_each_function_name(linker_file_t,
148 int (*)(const char *, void *), void *);
149 static int link_elf_each_function_nameval(linker_file_t,
150 linker_function_nameval_callback_t,
151 void *);
152 static int link_elf_reloc_local(linker_file_t, bool);
153 static long link_elf_symtab_get(linker_file_t, const Elf_Sym **);
154 static long link_elf_strtab_get(linker_file_t, caddr_t *);
155 #ifdef VIMAGE
156 static void link_elf_propagate_vnets(linker_file_t);
157 #endif
158
159 static int elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps,
160 Elf_Addr *);
161
162 static kobj_method_t link_elf_methods[] = {
163 KOBJMETHOD(linker_lookup_symbol, link_elf_lookup_symbol),
164 KOBJMETHOD(linker_lookup_debug_symbol, link_elf_lookup_debug_symbol),
165 KOBJMETHOD(linker_lookup_debug_symbol_ctf, link_elf_lookup_debug_symbol_ctf),
166 KOBJMETHOD(linker_symbol_values, link_elf_symbol_values),
167 KOBJMETHOD(linker_debug_symbol_values, link_elf_debug_symbol_values),
168 KOBJMETHOD(linker_search_symbol, link_elf_search_symbol),
169 KOBJMETHOD(linker_unload, link_elf_unload_file),
170 KOBJMETHOD(linker_load_file, link_elf_load_file),
171 KOBJMETHOD(linker_link_preload, link_elf_link_preload),
172 KOBJMETHOD(linker_link_preload_finish, link_elf_link_preload_finish),
173 KOBJMETHOD(linker_lookup_set, link_elf_lookup_set),
174 KOBJMETHOD(linker_each_function_name, link_elf_each_function_name),
175 KOBJMETHOD(linker_each_function_nameval, link_elf_each_function_nameval),
176 KOBJMETHOD(linker_ctf_get, link_elf_ctf_get),
177 KOBJMETHOD(linker_ctf_lookup_typename, link_elf_ctf_lookup_typename),
178 KOBJMETHOD(linker_symtab_get, link_elf_symtab_get),
179 KOBJMETHOD(linker_strtab_get, link_elf_strtab_get),
180 #ifdef VIMAGE
181 KOBJMETHOD(linker_propagate_vnets, link_elf_propagate_vnets),
182 #endif
183 KOBJMETHOD_END
184 };
185
186 static struct linker_class link_elf_class = {
187 #if ELF_TARG_CLASS == ELFCLASS32
188 "elf32_obj",
189 #else
190 "elf64_obj",
191 #endif
192 link_elf_methods, sizeof(struct elf_file)
193 };
194
195 static bool link_elf_obj_leak_locals = true;
196 SYSCTL_BOOL(_debug, OID_AUTO, link_elf_obj_leak_locals,
197 CTLFLAG_RWTUN, &link_elf_obj_leak_locals, 0,
198 "Allow local symbols to participate in global module symbol resolution");
199
200 static int relocate_file(elf_file_t ef);
201 static void elf_obj_cleanup_globals_cache(elf_file_t);
202
203 static void
link_elf_error(const char * filename,const char * s)204 link_elf_error(const char *filename, const char *s)
205 {
206 if (filename == NULL)
207 printf("kldload: %s\n", s);
208 else
209 printf("kldload: %s: %s\n", filename, s);
210 }
211
212 static void
link_elf_init(void * arg)213 link_elf_init(void *arg)
214 {
215
216 linker_add_class(&link_elf_class);
217 }
218 SYSINIT(link_elf_obj, SI_SUB_KLD, SI_ORDER_SECOND, link_elf_init, NULL);
219
220 static void
link_elf_protect_range(elf_file_t ef,vm_offset_t start,vm_offset_t end,vm_prot_t prot)221 link_elf_protect_range(elf_file_t ef, vm_offset_t start, vm_offset_t end,
222 vm_prot_t prot)
223 {
224 int error __unused;
225
226 KASSERT(start <= end && start >= (vm_offset_t)ef->address &&
227 end <= round_page((vm_offset_t)ef->address + ef->lf.size),
228 ("link_elf_protect_range: invalid range %#jx-%#jx",
229 (uintmax_t)start, (uintmax_t)end));
230
231 if (start == end)
232 return;
233 if (ef->preloaded) {
234 #ifdef __amd64__
235 error = pmap_change_prot(start, end - start, prot);
236 KASSERT(error == 0,
237 ("link_elf_protect_range: pmap_change_prot() returned %d",
238 error));
239 #endif
240 return;
241 }
242 error = vm_map_protect(kernel_map, start, end, prot, 0,
243 VM_MAP_PROTECT_SET_PROT);
244 KASSERT(error == KERN_SUCCESS,
245 ("link_elf_protect_range: vm_map_protect() returned %d", error));
246 }
247
248 /*
249 * Restrict permissions on linker file memory based on section flags.
250 * Sections need not be page-aligned, so overlap within a page is possible.
251 */
252 static void
link_elf_protect(elf_file_t ef)253 link_elf_protect(elf_file_t ef)
254 {
255 vm_offset_t end, segend, segstart, start;
256 vm_prot_t gapprot, prot, segprot;
257 int i;
258
259 /*
260 * If the file was preloaded, the last page may contain other preloaded
261 * data which may need to be writeable. ELF files are always
262 * page-aligned, but other preloaded data, such as entropy or CPU
263 * microcode may be loaded with a smaller alignment.
264 */
265 gapprot = ef->preloaded ? VM_PROT_RW : VM_PROT_READ;
266
267 start = end = (vm_offset_t)ef->address;
268 prot = VM_PROT_READ;
269 for (i = 0; i < ef->nprogtab; i++) {
270 /*
271 * VNET and DPCPU sections have their memory allocated by their
272 * respective subsystems.
273 */
274 if (ef->progtab[i].name != NULL && (
275 #ifdef VIMAGE
276 strcmp(ef->progtab[i].name, VNET_SETNAME) == 0 ||
277 #endif
278 strcmp(ef->progtab[i].name, DPCPU_SETNAME) == 0))
279 continue;
280
281 segstart = trunc_page((vm_offset_t)ef->progtab[i].addr);
282 segend = round_page((vm_offset_t)ef->progtab[i].addr +
283 ef->progtab[i].size);
284 segprot = VM_PROT_READ;
285 if ((ef->progtab[i].flags & SHF_WRITE) != 0)
286 segprot |= VM_PROT_WRITE;
287 if ((ef->progtab[i].flags & SHF_EXECINSTR) != 0)
288 segprot |= VM_PROT_EXECUTE;
289
290 if (end <= segstart) {
291 /*
292 * Case 1: there is no overlap between the previous
293 * segment and this one. Apply protections to the
294 * previous segment, and protect the gap between the
295 * previous and current segments, if any.
296 */
297 link_elf_protect_range(ef, start, end, prot);
298 link_elf_protect_range(ef, end, segstart, gapprot);
299
300 start = segstart;
301 end = segend;
302 prot = segprot;
303 } else if (start < segstart && end == segend) {
304 /*
305 * Case 2: the current segment is a subrange of the
306 * previous segment. Apply protections to the
307 * non-overlapping portion of the previous segment.
308 */
309 link_elf_protect_range(ef, start, segstart, prot);
310
311 start = segstart;
312 prot |= segprot;
313 } else if (end < segend) {
314 /*
315 * Case 3: there is partial overlap between the previous
316 * and current segments. Apply protections to the
317 * non-overlapping portion of the previous segment, and
318 * then the overlap, which must use the union of the two
319 * segments' protections.
320 */
321 link_elf_protect_range(ef, start, segstart, prot);
322 link_elf_protect_range(ef, segstart, end,
323 prot | segprot);
324 start = end;
325 end = segend;
326 prot = segprot;
327 } else {
328 /*
329 * Case 4: the two segments reside in the same page.
330 */
331 prot |= segprot;
332 }
333 }
334
335 /*
336 * Fix up the last unprotected segment and trailing data.
337 */
338 link_elf_protect_range(ef, start, end, prot);
339 link_elf_protect_range(ef, end,
340 round_page((vm_offset_t)ef->address + ef->lf.size), gapprot);
341 }
342
343 static int
link_elf_link_preload(linker_class_t cls,const char * filename,linker_file_t * result)344 link_elf_link_preload(linker_class_t cls, const char *filename,
345 linker_file_t *result)
346 {
347 Elf_Ehdr *hdr;
348 Elf_Shdr *shdr;
349 Elf_Sym *es;
350 void *modptr, *baseptr, *sizeptr;
351 char *type;
352 elf_file_t ef;
353 linker_file_t lf;
354 Elf_Addr off;
355 int error, i, j, pb, ra, rl, shstrindex, symstrindex, symtabindex;
356
357 /* Look to see if we have the file preloaded */
358 modptr = preload_search_by_name(filename);
359 if (modptr == NULL)
360 return ENOENT;
361
362 type = (char *)preload_search_info(modptr, MODINFO_TYPE);
363 baseptr = preload_search_info(modptr, MODINFO_ADDR);
364 sizeptr = preload_search_info(modptr, MODINFO_SIZE);
365 hdr = (Elf_Ehdr *)preload_search_info(modptr, MODINFO_METADATA |
366 MODINFOMD_ELFHDR);
367 shdr = (Elf_Shdr *)preload_search_info(modptr, MODINFO_METADATA |
368 MODINFOMD_SHDR);
369 if (type == NULL || strcmp(type, preload_modtype_obj) != 0)
370 return (EFTYPE);
371 if (baseptr == NULL || sizeptr == NULL || hdr == NULL ||
372 shdr == NULL)
373 return (EINVAL);
374
375 lf = linker_make_file(filename, &link_elf_class);
376 if (lf == NULL)
377 return (ENOMEM);
378
379 ef = (elf_file_t)lf;
380 ef->preloaded = 1;
381 ef->address = *(caddr_t *)baseptr;
382 lf->address = *(caddr_t *)baseptr;
383 lf->size = *(size_t *)sizeptr;
384
385 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
386 hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
387 hdr->e_ident[EI_VERSION] != EV_CURRENT ||
388 hdr->e_version != EV_CURRENT ||
389 hdr->e_type != ET_REL ||
390 hdr->e_machine != ELF_TARG_MACH) {
391 error = EFTYPE;
392 goto out;
393 }
394 ef->e_shdr = shdr;
395
396 /* Scan the section header for information and table sizing. */
397 symtabindex = -1;
398 symstrindex = -1;
399 for (i = 0; i < hdr->e_shnum; i++) {
400 switch (shdr[i].sh_type) {
401 case SHT_PROGBITS:
402 case SHT_NOBITS:
403 #ifdef __amd64__
404 case SHT_X86_64_UNWIND:
405 #endif
406 case SHT_INIT_ARRAY:
407 case SHT_FINI_ARRAY:
408 /* Ignore sections not loaded by the loader. */
409 if (shdr[i].sh_addr == 0)
410 break;
411 ef->nprogtab++;
412 break;
413 case SHT_SYMTAB:
414 symtabindex = i;
415 symstrindex = shdr[i].sh_link;
416 break;
417 case SHT_REL:
418 /*
419 * Ignore relocation tables for sections not
420 * loaded by the loader.
421 */
422 if (shdr[shdr[i].sh_info].sh_addr == 0)
423 break;
424 ef->nreltab++;
425 break;
426 case SHT_RELA:
427 if (shdr[shdr[i].sh_info].sh_addr == 0)
428 break;
429 ef->nrelatab++;
430 break;
431 }
432 }
433
434 shstrindex = hdr->e_shstrndx;
435 if (ef->nprogtab == 0 || symstrindex < 0 ||
436 symstrindex >= hdr->e_shnum ||
437 shdr[symstrindex].sh_type != SHT_STRTAB || shstrindex == 0 ||
438 shstrindex >= hdr->e_shnum ||
439 shdr[shstrindex].sh_type != SHT_STRTAB) {
440 printf("%s: bad/missing section headers\n", filename);
441 error = ENOEXEC;
442 goto out;
443 }
444
445 /* Allocate space for tracking the load chunks */
446 if (ef->nprogtab != 0)
447 ef->progtab = malloc(ef->nprogtab * sizeof(*ef->progtab),
448 M_LINKER, M_WAITOK | M_ZERO);
449 if (ef->nreltab != 0)
450 ef->reltab = malloc(ef->nreltab * sizeof(*ef->reltab),
451 M_LINKER, M_WAITOK | M_ZERO);
452 if (ef->nrelatab != 0)
453 ef->relatab = malloc(ef->nrelatab * sizeof(*ef->relatab),
454 M_LINKER, M_WAITOK | M_ZERO);
455 if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
456 (ef->nreltab != 0 && ef->reltab == NULL) ||
457 (ef->nrelatab != 0 && ef->relatab == NULL)) {
458 error = ENOMEM;
459 goto out;
460 }
461
462 /* XXX, relocate the sh_addr fields saved by the loader. */
463 off = 0;
464 for (i = 0; i < hdr->e_shnum; i++) {
465 if (shdr[i].sh_addr != 0 && (off == 0 || shdr[i].sh_addr < off))
466 off = shdr[i].sh_addr;
467 }
468 for (i = 0; i < hdr->e_shnum; i++) {
469 if (shdr[i].sh_addr != 0)
470 shdr[i].sh_addr = shdr[i].sh_addr - off +
471 (Elf_Addr)ef->address;
472 }
473
474 ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
475 ef->ddbsymtab = (Elf_Sym *)shdr[symtabindex].sh_addr;
476 ef->ddbstrcnt = shdr[symstrindex].sh_size;
477 ef->ddbstrtab = (char *)shdr[symstrindex].sh_addr;
478 ef->shstrcnt = shdr[shstrindex].sh_size;
479 ef->shstrtab = (char *)shdr[shstrindex].sh_addr;
480
481 /* Now fill out progtab and the relocation tables. */
482 pb = 0;
483 rl = 0;
484 ra = 0;
485 for (i = 0; i < hdr->e_shnum; i++) {
486 switch (shdr[i].sh_type) {
487 case SHT_PROGBITS:
488 case SHT_NOBITS:
489 #ifdef __amd64__
490 case SHT_X86_64_UNWIND:
491 #endif
492 case SHT_INIT_ARRAY:
493 case SHT_FINI_ARRAY:
494 if (shdr[i].sh_addr == 0)
495 break;
496 ef->progtab[pb].addr = ef->progtab[pb].origaddr =
497 (void *)shdr[i].sh_addr;
498 if (shdr[i].sh_type == SHT_PROGBITS)
499 ef->progtab[pb].name = "<<PROGBITS>>";
500 #ifdef __amd64__
501 else if (shdr[i].sh_type == SHT_X86_64_UNWIND)
502 ef->progtab[pb].name = "<<UNWIND>>";
503 #endif
504 else if (shdr[i].sh_type == SHT_INIT_ARRAY)
505 ef->progtab[pb].name = "<<INIT_ARRAY>>";
506 else if (shdr[i].sh_type == SHT_FINI_ARRAY)
507 ef->progtab[pb].name = "<<FINI_ARRAY>>";
508 else
509 ef->progtab[pb].name = "<<NOBITS>>";
510 ef->progtab[pb].size = shdr[i].sh_size;
511 ef->progtab[pb].flags = shdr[i].sh_flags;
512 ef->progtab[pb].sec = i;
513 if (ef->shstrtab && shdr[i].sh_name != 0)
514 ef->progtab[pb].name =
515 ef->shstrtab + shdr[i].sh_name;
516 if (ef->progtab[pb].name != NULL &&
517 !strcmp(ef->progtab[pb].name, DPCPU_SETNAME)) {
518 void *dpcpu;
519
520 dpcpu = dpcpu_alloc(shdr[i].sh_size);
521 if (dpcpu == NULL) {
522 printf("%s: pcpu module space is out "
523 "of space; cannot allocate %#jx "
524 "for %s\n", __func__,
525 (uintmax_t)shdr[i].sh_size,
526 filename);
527 error = ENOSPC;
528 goto out;
529 }
530 memcpy(dpcpu, ef->progtab[pb].addr,
531 ef->progtab[pb].size);
532 dpcpu_copy(dpcpu, shdr[i].sh_size);
533 ef->progtab[pb].addr = dpcpu;
534 #ifdef VIMAGE
535 } else if (ef->progtab[pb].name != NULL &&
536 !strcmp(ef->progtab[pb].name, VNET_SETNAME)) {
537 void *vnet_data;
538
539 vnet_data = vnet_data_alloc(shdr[i].sh_size);
540 if (vnet_data == NULL) {
541 printf("%s: vnet module space is out "
542 "of space; cannot allocate %#jx "
543 "for %s\n", __func__,
544 (uintmax_t)shdr[i].sh_size,
545 filename);
546 error = ENOSPC;
547 goto out;
548 }
549 memcpy(vnet_data, ef->progtab[pb].addr,
550 ef->progtab[pb].size);
551 ef->progtab[pb].addr = vnet_data;
552 vnet_save_init(ef->progtab[pb].addr,
553 ef->progtab[pb].size);
554 #endif
555 } else if ((ef->progtab[pb].name != NULL &&
556 strcmp(ef->progtab[pb].name, ".ctors") == 0) ||
557 shdr[i].sh_type == SHT_INIT_ARRAY) {
558 if (lf->ctors_addr != 0) {
559 printf(
560 "%s: multiple ctor sections in %s\n",
561 __func__, filename);
562 } else {
563 lf->ctors_addr = ef->progtab[pb].addr;
564 lf->ctors_size = shdr[i].sh_size;
565 }
566 } else if ((ef->progtab[pb].name != NULL &&
567 strcmp(ef->progtab[pb].name, ".dtors") == 0) ||
568 shdr[i].sh_type == SHT_FINI_ARRAY) {
569 if (lf->dtors_addr != 0) {
570 printf(
571 "%s: multiple dtor sections in %s\n",
572 __func__, filename);
573 } else {
574 lf->dtors_addr = ef->progtab[pb].addr;
575 lf->dtors_size = shdr[i].sh_size;
576 }
577 }
578
579 /* Update all symbol values with the offset. */
580 for (j = 0; j < ef->ddbsymcnt; j++) {
581 es = &ef->ddbsymtab[j];
582 if (es->st_shndx != i)
583 continue;
584 es->st_value += (Elf_Addr)ef->progtab[pb].addr;
585 }
586 pb++;
587 break;
588 case SHT_REL:
589 if (shdr[shdr[i].sh_info].sh_addr == 0)
590 break;
591 ef->reltab[rl].rel = (Elf_Rel *)shdr[i].sh_addr;
592 ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
593 ef->reltab[rl].sec = shdr[i].sh_info;
594 rl++;
595 break;
596 case SHT_RELA:
597 if (shdr[shdr[i].sh_info].sh_addr == 0)
598 break;
599 ef->relatab[ra].rela = (Elf_Rela *)shdr[i].sh_addr;
600 ef->relatab[ra].nrela =
601 shdr[i].sh_size / sizeof(Elf_Rela);
602 ef->relatab[ra].sec = shdr[i].sh_info;
603 ra++;
604 break;
605 }
606 }
607 if (pb != ef->nprogtab) {
608 printf("%s: lost progbits\n", filename);
609 error = ENOEXEC;
610 goto out;
611 }
612 if (rl != ef->nreltab) {
613 printf("%s: lost reltab\n", filename);
614 error = ENOEXEC;
615 goto out;
616 }
617 if (ra != ef->nrelatab) {
618 printf("%s: lost relatab\n", filename);
619 error = ENOEXEC;
620 goto out;
621 }
622
623 /*
624 * The file needs to be writeable and executable while applying
625 * relocations. Mapping protections are applied once relocation
626 * processing is complete.
627 */
628 link_elf_protect_range(ef, (vm_offset_t)ef->address,
629 round_page((vm_offset_t)ef->address + ef->lf.size), VM_PROT_ALL);
630
631 /* Local intra-module relocations */
632 error = link_elf_reloc_local(lf, false);
633 if (error != 0)
634 goto out;
635 *result = lf;
636 return (0);
637
638 out:
639 /* preload not done this way */
640 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
641 return (error);
642 }
643
644 static void
link_elf_invoke_cbs(caddr_t addr,size_t size)645 link_elf_invoke_cbs(caddr_t addr, size_t size)
646 {
647 void (**ctor)(void);
648 size_t i, cnt;
649
650 if (addr == NULL || size == 0)
651 return;
652 cnt = size / sizeof(*ctor);
653 ctor = (void *)addr;
654 for (i = 0; i < cnt; i++) {
655 if (ctor[i] != NULL)
656 (*ctor[i])();
657 }
658 }
659
660 static void
link_elf_invoke_ctors(linker_file_t lf)661 link_elf_invoke_ctors(linker_file_t lf)
662 {
663 KASSERT(lf->ctors_invoked == LF_NONE,
664 ("%s: file %s ctor state %d",
665 __func__, lf->filename, lf->ctors_invoked));
666
667 link_elf_invoke_cbs(lf->ctors_addr, lf->ctors_size);
668 lf->ctors_invoked = LF_CTORS;
669 }
670
671 static void
link_elf_invoke_dtors(linker_file_t lf)672 link_elf_invoke_dtors(linker_file_t lf)
673 {
674 KASSERT(lf->ctors_invoked != LF_DTORS,
675 ("%s: file %s ctor state %d",
676 __func__, lf->filename, lf->ctors_invoked));
677
678 if (lf->ctors_invoked == LF_CTORS) {
679 link_elf_invoke_cbs(lf->dtors_addr, lf->dtors_size);
680 lf->ctors_invoked = LF_DTORS;
681 }
682 }
683
684 static int
link_elf_link_preload_finish(linker_file_t lf)685 link_elf_link_preload_finish(linker_file_t lf)
686 {
687 elf_file_t ef;
688 int error;
689
690 ef = (elf_file_t)lf;
691 error = relocate_file(ef);
692 if (error)
693 return (error);
694
695 /* Notify MD code that a module is being loaded. */
696 error = elf_cpu_load_file(lf);
697 if (error)
698 return (error);
699
700 #if defined(__i386__) || defined(__amd64__)
701 /* Now ifuncs. */
702 error = link_elf_reloc_local(lf, true);
703 if (error != 0)
704 return (error);
705 #endif
706
707 /* Apply protections now that relocation processing is complete. */
708 link_elf_protect(ef);
709
710 link_elf_invoke_ctors(lf);
711 return (0);
712 }
713
714 static int
link_elf_load_file(linker_class_t cls,const char * filename,linker_file_t * result)715 link_elf_load_file(linker_class_t cls, const char *filename,
716 linker_file_t *result)
717 {
718 struct nameidata *nd;
719 struct thread *td = curthread; /* XXX */
720 Elf_Ehdr *hdr;
721 Elf_Shdr *shdr;
722 Elf_Sym *es;
723 int nbytes, i, j;
724 vm_offset_t mapbase;
725 size_t mapsize;
726 int error = 0;
727 ssize_t resid;
728 int flags;
729 elf_file_t ef;
730 linker_file_t lf;
731 int symtabindex;
732 int symstrindex;
733 int shstrindex;
734 int nsym;
735 int pb, rl, ra;
736 int alignmask;
737
738 shdr = NULL;
739 lf = NULL;
740 mapsize = 0;
741 hdr = NULL;
742
743 nd = malloc(sizeof(struct nameidata), M_TEMP, M_WAITOK);
744 NDINIT(nd, LOOKUP, FOLLOW, UIO_SYSSPACE, filename);
745 flags = FREAD;
746 error = vn_open(nd, &flags, 0, NULL);
747 if (error) {
748 free(nd, M_TEMP);
749 return error;
750 }
751 NDFREE_PNBUF(nd);
752 if (nd->ni_vp->v_type != VREG) {
753 error = ENOEXEC;
754 goto out;
755 }
756 #ifdef MAC
757 error = mac_kld_check_load(td->td_ucred, nd->ni_vp);
758 if (error) {
759 goto out;
760 }
761 #endif
762
763 /* Read the elf header from the file. */
764 hdr = malloc(sizeof(*hdr), M_LINKER, M_WAITOK);
765 error = vn_rdwr(UIO_READ, nd->ni_vp, (void *)hdr, sizeof(*hdr), 0,
766 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
767 &resid, td);
768 if (error)
769 goto out;
770 if (resid != 0){
771 error = ENOEXEC;
772 goto out;
773 }
774
775 if (!IS_ELF(*hdr)) {
776 error = ENOEXEC;
777 goto out;
778 }
779
780 if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS
781 || hdr->e_ident[EI_DATA] != ELF_TARG_DATA) {
782 link_elf_error(filename, "Unsupported file layout");
783 error = ENOEXEC;
784 goto out;
785 }
786 if (hdr->e_ident[EI_VERSION] != EV_CURRENT
787 || hdr->e_version != EV_CURRENT) {
788 link_elf_error(filename, "Unsupported file version");
789 error = ENOEXEC;
790 goto out;
791 }
792 if (hdr->e_type != ET_REL) {
793 error = ENOSYS;
794 goto out;
795 }
796 if (hdr->e_machine != ELF_TARG_MACH) {
797 link_elf_error(filename, "Unsupported machine");
798 error = ENOEXEC;
799 goto out;
800 }
801
802 lf = linker_make_file(filename, &link_elf_class);
803 if (!lf) {
804 error = ENOMEM;
805 goto out;
806 }
807 ef = (elf_file_t) lf;
808 ef->nprogtab = 0;
809 ef->e_shdr = 0;
810 ef->nreltab = 0;
811 ef->nrelatab = 0;
812
813 /* Allocate and read in the section header */
814 nbytes = hdr->e_shnum * hdr->e_shentsize;
815 if (nbytes == 0 || hdr->e_shoff == 0 ||
816 hdr->e_shentsize != sizeof(Elf_Shdr)) {
817 error = ENOEXEC;
818 goto out;
819 }
820 shdr = malloc(nbytes, M_LINKER, M_WAITOK);
821 ef->e_shdr = shdr;
822 error = vn_rdwr(UIO_READ, nd->ni_vp, (caddr_t)shdr, nbytes,
823 hdr->e_shoff, UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
824 NOCRED, &resid, td);
825 if (error)
826 goto out;
827 if (resid) {
828 error = ENOEXEC;
829 goto out;
830 }
831
832 /* Scan the section header for information and table sizing. */
833 nsym = 0;
834 symtabindex = -1;
835 symstrindex = -1;
836 for (i = 0; i < hdr->e_shnum; i++) {
837 if (shdr[i].sh_size == 0)
838 continue;
839 switch (shdr[i].sh_type) {
840 case SHT_PROGBITS:
841 case SHT_NOBITS:
842 #ifdef __amd64__
843 case SHT_X86_64_UNWIND:
844 #endif
845 case SHT_INIT_ARRAY:
846 case SHT_FINI_ARRAY:
847 if ((shdr[i].sh_flags & SHF_ALLOC) == 0)
848 break;
849 ef->nprogtab++;
850 break;
851 case SHT_SYMTAB:
852 nsym++;
853 symtabindex = i;
854 symstrindex = shdr[i].sh_link;
855 break;
856 case SHT_REL:
857 /*
858 * Ignore relocation tables for unallocated
859 * sections.
860 */
861 if ((shdr[shdr[i].sh_info].sh_flags & SHF_ALLOC) == 0)
862 break;
863 ef->nreltab++;
864 break;
865 case SHT_RELA:
866 if ((shdr[shdr[i].sh_info].sh_flags & SHF_ALLOC) == 0)
867 break;
868 ef->nrelatab++;
869 break;
870 case SHT_STRTAB:
871 break;
872 }
873 }
874 if (ef->nprogtab == 0) {
875 link_elf_error(filename, "file has no contents");
876 error = ENOEXEC;
877 goto out;
878 }
879 if (nsym != 1) {
880 /* Only allow one symbol table for now */
881 link_elf_error(filename,
882 "file must have exactly one symbol table");
883 error = ENOEXEC;
884 goto out;
885 }
886 if (symstrindex < 0 || symstrindex > hdr->e_shnum ||
887 shdr[symstrindex].sh_type != SHT_STRTAB) {
888 link_elf_error(filename, "file has invalid symbol strings");
889 error = ENOEXEC;
890 goto out;
891 }
892
893 /* Allocate space for tracking the load chunks */
894 if (ef->nprogtab != 0)
895 ef->progtab = malloc(ef->nprogtab * sizeof(*ef->progtab),
896 M_LINKER, M_WAITOK | M_ZERO);
897 if (ef->nreltab != 0)
898 ef->reltab = malloc(ef->nreltab * sizeof(*ef->reltab),
899 M_LINKER, M_WAITOK | M_ZERO);
900 if (ef->nrelatab != 0)
901 ef->relatab = malloc(ef->nrelatab * sizeof(*ef->relatab),
902 M_LINKER, M_WAITOK | M_ZERO);
903
904 if (symtabindex == -1) {
905 link_elf_error(filename, "lost symbol table index");
906 error = ENOEXEC;
907 goto out;
908 }
909 /* Allocate space for and load the symbol table */
910 ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
911 ef->ddbsymtab = malloc(shdr[symtabindex].sh_size, M_LINKER, M_WAITOK);
912 error = vn_rdwr(UIO_READ, nd->ni_vp, (void *)ef->ddbsymtab,
913 shdr[symtabindex].sh_size, shdr[symtabindex].sh_offset,
914 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
915 &resid, td);
916 if (error)
917 goto out;
918 if (resid != 0){
919 error = EINVAL;
920 goto out;
921 }
922
923 /* Allocate space for and load the symbol strings */
924 ef->ddbstrcnt = shdr[symstrindex].sh_size;
925 ef->ddbstrtab = malloc(shdr[symstrindex].sh_size, M_LINKER, M_WAITOK);
926 error = vn_rdwr(UIO_READ, nd->ni_vp, ef->ddbstrtab,
927 shdr[symstrindex].sh_size, shdr[symstrindex].sh_offset,
928 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
929 &resid, td);
930 if (error)
931 goto out;
932 if (resid != 0){
933 error = EINVAL;
934 goto out;
935 }
936
937 /* Do we have a string table for the section names? */
938 shstrindex = -1;
939 if (hdr->e_shstrndx != 0 &&
940 shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) {
941 shstrindex = hdr->e_shstrndx;
942 ef->shstrcnt = shdr[shstrindex].sh_size;
943 ef->shstrtab = malloc(shdr[shstrindex].sh_size, M_LINKER,
944 M_WAITOK);
945 error = vn_rdwr(UIO_READ, nd->ni_vp, ef->shstrtab,
946 shdr[shstrindex].sh_size, shdr[shstrindex].sh_offset,
947 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
948 &resid, td);
949 if (error)
950 goto out;
951 if (resid != 0){
952 error = EINVAL;
953 goto out;
954 }
955 }
956
957 /* Size up code/data(progbits) and bss(nobits). */
958 alignmask = 0;
959 for (i = 0; i < hdr->e_shnum; i++) {
960 if (shdr[i].sh_size == 0)
961 continue;
962 switch (shdr[i].sh_type) {
963 case SHT_PROGBITS:
964 case SHT_NOBITS:
965 #ifdef __amd64__
966 case SHT_X86_64_UNWIND:
967 #endif
968 case SHT_INIT_ARRAY:
969 case SHT_FINI_ARRAY:
970 if ((shdr[i].sh_flags & SHF_ALLOC) == 0)
971 break;
972 alignmask = shdr[i].sh_addralign - 1;
973 mapsize += alignmask;
974 mapsize &= ~alignmask;
975 mapsize += shdr[i].sh_size;
976 break;
977 }
978 }
979
980 /*
981 * We know how much space we need for the text/data/bss/etc.
982 * This stuff needs to be in a single chunk so that profiling etc
983 * can get the bounds and gdb can associate offsets with modules
984 */
985 ef->object = vm_pager_allocate(OBJT_PHYS, NULL, round_page(mapsize),
986 VM_PROT_ALL, 0, thread0.td_ucred);
987 if (ef->object == NULL) {
988 error = ENOMEM;
989 goto out;
990 }
991 #if VM_NRESERVLEVEL > 0
992 vm_object_color(ef->object, 0);
993 #endif
994
995 /*
996 * In order to satisfy amd64's architectural requirements on the
997 * location of code and data in the kernel's address space, request a
998 * mapping that is above the kernel.
999 *
1000 * Protections will be restricted once relocations are applied.
1001 */
1002 #ifdef __amd64__
1003 mapbase = KERNBASE;
1004 #else
1005 mapbase = VM_MIN_KERNEL_ADDRESS;
1006 #endif
1007 error = vm_map_find(kernel_map, ef->object, 0, &mapbase,
1008 round_page(mapsize), 0, VMFS_OPTIMAL_SPACE, VM_PROT_ALL,
1009 VM_PROT_ALL, 0);
1010 if (error != KERN_SUCCESS) {
1011 vm_object_deallocate(ef->object);
1012 ef->object = NULL;
1013 error = ENOMEM;
1014 goto out;
1015 }
1016
1017 /* Wire the pages */
1018 error = vm_map_wire(kernel_map, mapbase,
1019 mapbase + round_page(mapsize),
1020 VM_MAP_WIRE_SYSTEM|VM_MAP_WIRE_NOHOLES);
1021 if (error != KERN_SUCCESS) {
1022 error = ENOMEM;
1023 goto out;
1024 }
1025
1026 /* Inform the kld system about the situation */
1027 lf->address = ef->address = (caddr_t)mapbase;
1028 lf->size = mapsize;
1029
1030 /*
1031 * Now load code/data(progbits), zero bss(nobits), allocate space for
1032 * and load relocs
1033 */
1034 pb = 0;
1035 rl = 0;
1036 ra = 0;
1037 alignmask = 0;
1038 for (i = 0; i < hdr->e_shnum; i++) {
1039 if (shdr[i].sh_size == 0)
1040 continue;
1041 switch (shdr[i].sh_type) {
1042 case SHT_PROGBITS:
1043 case SHT_NOBITS:
1044 #ifdef __amd64__
1045 case SHT_X86_64_UNWIND:
1046 #endif
1047 case SHT_INIT_ARRAY:
1048 case SHT_FINI_ARRAY:
1049 if ((shdr[i].sh_flags & SHF_ALLOC) == 0)
1050 break;
1051 alignmask = shdr[i].sh_addralign - 1;
1052 mapbase += alignmask;
1053 mapbase &= ~alignmask;
1054 if (ef->shstrtab != NULL && shdr[i].sh_name != 0) {
1055 ef->progtab[pb].name =
1056 ef->shstrtab + shdr[i].sh_name;
1057 if (!strcmp(ef->progtab[pb].name, ".ctors") ||
1058 shdr[i].sh_type == SHT_INIT_ARRAY) {
1059 if (lf->ctors_addr != 0) {
1060 printf(
1061 "%s: multiple ctor sections in %s\n",
1062 __func__, filename);
1063 } else {
1064 lf->ctors_addr =
1065 (caddr_t)mapbase;
1066 lf->ctors_size =
1067 shdr[i].sh_size;
1068 }
1069 } else if (!strcmp(ef->progtab[pb].name,
1070 ".dtors") ||
1071 shdr[i].sh_type == SHT_FINI_ARRAY) {
1072 if (lf->dtors_addr != 0) {
1073 printf(
1074 "%s: multiple dtor sections in %s\n",
1075 __func__, filename);
1076 } else {
1077 lf->dtors_addr =
1078 (caddr_t)mapbase;
1079 lf->dtors_size =
1080 shdr[i].sh_size;
1081 }
1082 }
1083 } else if (shdr[i].sh_type == SHT_PROGBITS)
1084 ef->progtab[pb].name = "<<PROGBITS>>";
1085 #ifdef __amd64__
1086 else if (shdr[i].sh_type == SHT_X86_64_UNWIND)
1087 ef->progtab[pb].name = "<<UNWIND>>";
1088 #endif
1089 else
1090 ef->progtab[pb].name = "<<NOBITS>>";
1091 if (ef->progtab[pb].name != NULL &&
1092 !strcmp(ef->progtab[pb].name, DPCPU_SETNAME)) {
1093 ef->progtab[pb].origaddr =
1094 (void *)(uintptr_t)mapbase;
1095 ef->progtab[pb].addr =
1096 dpcpu_alloc(shdr[i].sh_size);
1097 if (ef->progtab[pb].addr == NULL) {
1098 printf("%s: pcpu module space is out "
1099 "of space; cannot allocate %#jx "
1100 "for %s\n", __func__,
1101 (uintmax_t)shdr[i].sh_size,
1102 filename);
1103 }
1104 }
1105 #ifdef VIMAGE
1106 else if (ef->progtab[pb].name != NULL &&
1107 !strcmp(ef->progtab[pb].name, VNET_SETNAME)) {
1108 ef->progtab[pb].origaddr =
1109 (void *)(uintptr_t)mapbase;
1110 ef->progtab[pb].addr =
1111 vnet_data_alloc(shdr[i].sh_size);
1112 if (ef->progtab[pb].addr == NULL) {
1113 printf("%s: vnet module space is out "
1114 "of space; cannot allocate %#jx "
1115 "for %s\n", __func__,
1116 (uintmax_t)shdr[i].sh_size,
1117 filename);
1118 }
1119 }
1120 #endif
1121 else
1122 ef->progtab[pb].addr =
1123 (void *)(uintptr_t)mapbase;
1124 if (ef->progtab[pb].addr == NULL) {
1125 error = ENOSPC;
1126 goto out;
1127 }
1128 ef->progtab[pb].size = shdr[i].sh_size;
1129 ef->progtab[pb].flags = shdr[i].sh_flags;
1130 ef->progtab[pb].sec = i;
1131 if (shdr[i].sh_type == SHT_PROGBITS
1132 #ifdef __amd64__
1133 || shdr[i].sh_type == SHT_X86_64_UNWIND
1134 #endif
1135 ) {
1136 error = vn_rdwr(UIO_READ, nd->ni_vp,
1137 ef->progtab[pb].addr,
1138 shdr[i].sh_size, shdr[i].sh_offset,
1139 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
1140 NOCRED, &resid, td);
1141 if (error)
1142 goto out;
1143 if (resid != 0){
1144 error = EINVAL;
1145 goto out;
1146 }
1147 /* Initialize the per-cpu area. */
1148 if (ef->progtab[pb].addr != (void *)mapbase &&
1149 !strcmp(ef->progtab[pb].name, DPCPU_SETNAME))
1150 dpcpu_copy(ef->progtab[pb].addr,
1151 shdr[i].sh_size);
1152 } else
1153 bzero(ef->progtab[pb].addr, shdr[i].sh_size);
1154
1155 #ifdef VIMAGE
1156 if (ef->progtab[pb].addr != (void *)mapbase &&
1157 strcmp(ef->progtab[pb].name, VNET_SETNAME) == 0)
1158 vnet_save_init(ef->progtab[pb].addr,
1159 ef->progtab[pb].size);
1160 #endif
1161 /* Update all symbol values with the offset. */
1162 for (j = 0; j < ef->ddbsymcnt; j++) {
1163 es = &ef->ddbsymtab[j];
1164 if (es->st_shndx != i)
1165 continue;
1166 es->st_value += (Elf_Addr)ef->progtab[pb].addr;
1167 }
1168 mapbase += shdr[i].sh_size;
1169 pb++;
1170 break;
1171 case SHT_REL:
1172 if ((shdr[shdr[i].sh_info].sh_flags & SHF_ALLOC) == 0)
1173 break;
1174 ef->reltab[rl].rel = malloc(shdr[i].sh_size, M_LINKER,
1175 M_WAITOK);
1176 ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
1177 ef->reltab[rl].sec = shdr[i].sh_info;
1178 error = vn_rdwr(UIO_READ, nd->ni_vp,
1179 (void *)ef->reltab[rl].rel,
1180 shdr[i].sh_size, shdr[i].sh_offset,
1181 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
1182 &resid, td);
1183 if (error)
1184 goto out;
1185 if (resid != 0){
1186 error = EINVAL;
1187 goto out;
1188 }
1189 rl++;
1190 break;
1191 case SHT_RELA:
1192 if ((shdr[shdr[i].sh_info].sh_flags & SHF_ALLOC) == 0)
1193 break;
1194 ef->relatab[ra].rela = malloc(shdr[i].sh_size, M_LINKER,
1195 M_WAITOK);
1196 ef->relatab[ra].nrela =
1197 shdr[i].sh_size / sizeof(Elf_Rela);
1198 ef->relatab[ra].sec = shdr[i].sh_info;
1199 error = vn_rdwr(UIO_READ, nd->ni_vp,
1200 (void *)ef->relatab[ra].rela,
1201 shdr[i].sh_size, shdr[i].sh_offset,
1202 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
1203 &resid, td);
1204 if (error)
1205 goto out;
1206 if (resid != 0){
1207 error = EINVAL;
1208 goto out;
1209 }
1210 ra++;
1211 break;
1212 }
1213 }
1214 if (pb != ef->nprogtab) {
1215 link_elf_error(filename, "lost progbits");
1216 error = ENOEXEC;
1217 goto out;
1218 }
1219 if (rl != ef->nreltab) {
1220 link_elf_error(filename, "lost reltab");
1221 error = ENOEXEC;
1222 goto out;
1223 }
1224 if (ra != ef->nrelatab) {
1225 link_elf_error(filename, "lost relatab");
1226 error = ENOEXEC;
1227 goto out;
1228 }
1229 if (mapbase != (vm_offset_t)ef->address + mapsize) {
1230 printf(
1231 "%s: mapbase 0x%lx != address %p + mapsize 0x%lx (0x%lx)\n",
1232 filename != NULL ? filename : "<none>",
1233 (u_long)mapbase, ef->address, (u_long)mapsize,
1234 (u_long)(vm_offset_t)ef->address + mapsize);
1235 error = ENOMEM;
1236 goto out;
1237 }
1238
1239 /* Local intra-module relocations */
1240 error = link_elf_reloc_local(lf, false);
1241 if (error != 0)
1242 goto out;
1243
1244 /* Pull in dependencies */
1245 VOP_UNLOCK(nd->ni_vp);
1246 error = linker_load_dependencies(lf);
1247 vn_lock(nd->ni_vp, LK_EXCLUSIVE | LK_RETRY);
1248 if (error)
1249 goto out;
1250
1251 /* External relocations */
1252 error = relocate_file(ef);
1253 if (error)
1254 goto out;
1255
1256 /* Notify MD code that a module is being loaded. */
1257 error = elf_cpu_load_file(lf);
1258 if (error)
1259 goto out;
1260
1261 #if defined(__i386__) || defined(__amd64__)
1262 /* Now ifuncs. */
1263 error = link_elf_reloc_local(lf, true);
1264 if (error != 0)
1265 goto out;
1266 #endif
1267
1268 link_elf_protect(ef);
1269 link_elf_invoke_ctors(lf);
1270 *result = lf;
1271
1272 out:
1273 VOP_UNLOCK(nd->ni_vp);
1274 vn_close(nd->ni_vp, FREAD, td->td_ucred, td);
1275 free(nd, M_TEMP);
1276 if (error && lf)
1277 linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1278 free(hdr, M_LINKER);
1279
1280 return error;
1281 }
1282
1283 static void
link_elf_unload_file(linker_file_t file)1284 link_elf_unload_file(linker_file_t file)
1285 {
1286 elf_file_t ef = (elf_file_t) file;
1287 u_int i;
1288
1289 link_elf_invoke_dtors(file);
1290
1291 /* Notify MD code that a module is being unloaded. */
1292 elf_cpu_unload_file(file);
1293
1294 if (ef->progtab) {
1295 for (i = 0; i < ef->nprogtab; i++) {
1296 if (ef->progtab[i].size == 0)
1297 continue;
1298 if (ef->progtab[i].name == NULL)
1299 continue;
1300 if (!strcmp(ef->progtab[i].name, DPCPU_SETNAME))
1301 dpcpu_free(ef->progtab[i].addr,
1302 ef->progtab[i].size);
1303 #ifdef VIMAGE
1304 else if (!strcmp(ef->progtab[i].name, VNET_SETNAME))
1305 vnet_data_free(ef->progtab[i].addr,
1306 ef->progtab[i].size);
1307 #endif
1308 }
1309 }
1310 if (ef->preloaded) {
1311 free(ef->reltab, M_LINKER);
1312 free(ef->relatab, M_LINKER);
1313 free(ef->progtab, M_LINKER);
1314 free(ef->ctftab, M_LINKER);
1315 free(ef->ctfoff, M_LINKER);
1316 free(ef->typoff, M_LINKER);
1317 if (file->pathname != NULL)
1318 preload_delete_name(file->pathname);
1319 return;
1320 }
1321
1322 for (i = 0; i < ef->nreltab; i++)
1323 free(ef->reltab[i].rel, M_LINKER);
1324 for (i = 0; i < ef->nrelatab; i++)
1325 free(ef->relatab[i].rela, M_LINKER);
1326 free(ef->reltab, M_LINKER);
1327 free(ef->relatab, M_LINKER);
1328 free(ef->progtab, M_LINKER);
1329
1330 if (ef->object != NULL)
1331 vm_map_remove(kernel_map, (vm_offset_t)ef->address,
1332 (vm_offset_t)ef->address + ptoa(ef->object->size));
1333 free(ef->e_shdr, M_LINKER);
1334 free(ef->ddbsymtab, M_LINKER);
1335 free(ef->ddbstrtab, M_LINKER);
1336 free(ef->shstrtab, M_LINKER);
1337 free(ef->ctftab, M_LINKER);
1338 free(ef->ctfoff, M_LINKER);
1339 free(ef->typoff, M_LINKER);
1340 }
1341
1342 static const char *
symbol_name(elf_file_t ef,Elf_Size r_info)1343 symbol_name(elf_file_t ef, Elf_Size r_info)
1344 {
1345 const Elf_Sym *ref;
1346
1347 if (ELF_R_SYM(r_info)) {
1348 ref = ef->ddbsymtab + ELF_R_SYM(r_info);
1349 return ef->ddbstrtab + ref->st_name;
1350 } else
1351 return NULL;
1352 }
1353
1354 static Elf_Addr
findbase(elf_file_t ef,int sec)1355 findbase(elf_file_t ef, int sec)
1356 {
1357 int i;
1358 Elf_Addr base = 0;
1359
1360 for (i = 0; i < ef->nprogtab; i++) {
1361 if (sec == ef->progtab[i].sec) {
1362 base = (Elf_Addr)ef->progtab[i].addr;
1363 break;
1364 }
1365 }
1366 return base;
1367 }
1368
1369 static int
relocate_file1(elf_file_t ef,bool ifuncs)1370 relocate_file1(elf_file_t ef, bool ifuncs)
1371 {
1372 const Elf_Rel *rellim;
1373 const Elf_Rel *rel;
1374 const Elf_Rela *relalim;
1375 const Elf_Rela *rela;
1376 const char *symname;
1377 const Elf_Sym *sym;
1378 int i;
1379 Elf_Size symidx;
1380 Elf_Addr base;
1381
1382 /* Perform relocations without addend if there are any: */
1383 for (i = 0; i < ef->nreltab; i++) {
1384 rel = ef->reltab[i].rel;
1385 if (rel == NULL) {
1386 link_elf_error(ef->lf.filename, "lost a reltab!");
1387 return (ENOEXEC);
1388 }
1389 rellim = rel + ef->reltab[i].nrel;
1390 base = findbase(ef, ef->reltab[i].sec);
1391 if (base == 0) {
1392 link_elf_error(ef->lf.filename, "lost base for reltab");
1393 return (ENOEXEC);
1394 }
1395 for ( ; rel < rellim; rel++) {
1396 symidx = ELF_R_SYM(rel->r_info);
1397 if (symidx >= ef->ddbsymcnt)
1398 continue;
1399 sym = ef->ddbsymtab + symidx;
1400 /* Local relocs are already done */
1401 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
1402 continue;
1403 if ((ELF_ST_TYPE(sym->st_info) == STT_GNU_IFUNC ||
1404 elf_is_ifunc_reloc(rel->r_info)) != ifuncs)
1405 continue;
1406 if (elf_reloc(&ef->lf, base, rel, ELF_RELOC_REL,
1407 elf_obj_lookup)) {
1408 symname = symbol_name(ef, rel->r_info);
1409 printf("link_elf_obj: symbol %s undefined\n",
1410 symname);
1411 return (ENOENT);
1412 }
1413 }
1414 }
1415
1416 /* Perform relocations with addend if there are any: */
1417 for (i = 0; i < ef->nrelatab; i++) {
1418 rela = ef->relatab[i].rela;
1419 if (rela == NULL) {
1420 link_elf_error(ef->lf.filename, "lost a relatab!");
1421 return (ENOEXEC);
1422 }
1423 relalim = rela + ef->relatab[i].nrela;
1424 base = findbase(ef, ef->relatab[i].sec);
1425 if (base == 0) {
1426 link_elf_error(ef->lf.filename,
1427 "lost base for relatab");
1428 return (ENOEXEC);
1429 }
1430 for ( ; rela < relalim; rela++) {
1431 symidx = ELF_R_SYM(rela->r_info);
1432 if (symidx >= ef->ddbsymcnt)
1433 continue;
1434 sym = ef->ddbsymtab + symidx;
1435 /* Local relocs are already done */
1436 if (ELF_ST_BIND(sym->st_info) == STB_LOCAL)
1437 continue;
1438 if ((ELF_ST_TYPE(sym->st_info) == STT_GNU_IFUNC ||
1439 elf_is_ifunc_reloc(rela->r_info)) != ifuncs)
1440 continue;
1441 if (elf_reloc(&ef->lf, base, rela, ELF_RELOC_RELA,
1442 elf_obj_lookup)) {
1443 symname = symbol_name(ef, rela->r_info);
1444 printf("link_elf_obj: symbol %s undefined\n",
1445 symname);
1446 return (ENOENT);
1447 }
1448 }
1449 }
1450
1451 /*
1452 * Only clean SHN_FBSD_CACHED for successful return. If we
1453 * modified symbol table for the object but found an
1454 * unresolved symbol, there is no reason to roll back.
1455 */
1456 elf_obj_cleanup_globals_cache(ef);
1457
1458 return (0);
1459 }
1460
1461 static int
relocate_file(elf_file_t ef)1462 relocate_file(elf_file_t ef)
1463 {
1464 int error;
1465
1466 error = relocate_file1(ef, false);
1467 if (error == 0)
1468 error = relocate_file1(ef, true);
1469 return (error);
1470 }
1471
1472 static int
link_elf_lookup_symbol1(linker_file_t lf,const char * name,c_linker_sym_t * sym,bool see_local)1473 link_elf_lookup_symbol1(linker_file_t lf, const char *name, c_linker_sym_t *sym,
1474 bool see_local)
1475 {
1476 elf_file_t ef = (elf_file_t)lf;
1477 const Elf_Sym *symp;
1478 const char *strp;
1479 int i;
1480
1481 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1482 strp = ef->ddbstrtab + symp->st_name;
1483 if (symp->st_shndx != SHN_UNDEF && strcmp(name, strp) == 0) {
1484 if (see_local ||
1485 ELF_ST_BIND(symp->st_info) == STB_GLOBAL) {
1486 *sym = (c_linker_sym_t) symp;
1487 return (0);
1488 }
1489 return (ENOENT);
1490 }
1491 }
1492 return (ENOENT);
1493 }
1494
1495 static int
link_elf_lookup_symbol(linker_file_t lf,const char * name,c_linker_sym_t * sym)1496 link_elf_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym)
1497 {
1498 return (link_elf_lookup_symbol1(lf, name, sym,
1499 link_elf_obj_leak_locals));
1500 }
1501
1502 static int
link_elf_lookup_debug_symbol(linker_file_t lf,const char * name,c_linker_sym_t * sym)1503 link_elf_lookup_debug_symbol(linker_file_t lf, const char *name,
1504 c_linker_sym_t *sym)
1505 {
1506 return (link_elf_lookup_symbol1(lf, name, sym, true));
1507 }
1508
1509 static int
link_elf_lookup_debug_symbol_ctf(linker_file_t lf,const char * name,c_linker_sym_t * sym,linker_ctf_t * lc)1510 link_elf_lookup_debug_symbol_ctf(linker_file_t lf, const char *name,
1511 c_linker_sym_t *sym, linker_ctf_t *lc)
1512 {
1513 if (link_elf_lookup_debug_symbol(lf, name, sym))
1514 return (ENOENT);
1515
1516 return (link_elf_ctf_get_ddb(lf, lc));
1517 }
1518
1519 static void
link_elf_ifunc_symbol_value(linker_file_t lf,caddr_t * valp,size_t * sizep)1520 link_elf_ifunc_symbol_value(linker_file_t lf, caddr_t *valp, size_t *sizep)
1521 {
1522 c_linker_sym_t sym;
1523 const Elf_Sym *es;
1524 caddr_t val;
1525 long off;
1526
1527 val = *valp;
1528
1529 /* Provide the value and size of the target symbol, if available. */
1530 val = ((caddr_t (*)(void))val)();
1531 if (link_elf_search_symbol(lf, val, &sym, &off) == 0 && off == 0) {
1532 es = (const Elf_Sym *)sym;
1533 *valp = (caddr_t)es->st_value;
1534 *sizep = es->st_size;
1535 } else {
1536 *valp = val;
1537 *sizep = 0;
1538 }
1539 }
1540
1541 static int
link_elf_symbol_values1(linker_file_t lf,c_linker_sym_t sym,linker_symval_t * symval,bool see_local)1542 link_elf_symbol_values1(linker_file_t lf, c_linker_sym_t sym,
1543 linker_symval_t *symval, bool see_local)
1544 {
1545 elf_file_t ef;
1546 const Elf_Sym *es;
1547 caddr_t val;
1548 size_t size;
1549
1550 ef = (elf_file_t) lf;
1551 es = (const Elf_Sym*) sym;
1552 val = (caddr_t)es->st_value;
1553 if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) {
1554 if (!see_local && ELF_ST_BIND(es->st_info) == STB_LOCAL)
1555 return (ENOENT);
1556 symval->name = ef->ddbstrtab + es->st_name;
1557 val = (caddr_t)es->st_value;
1558 if (ELF_ST_TYPE(es->st_info) == STT_GNU_IFUNC)
1559 link_elf_ifunc_symbol_value(lf, &val, &size);
1560 else
1561 size = es->st_size;
1562 symval->value = val;
1563 symval->size = size;
1564 return (0);
1565 }
1566 return (ENOENT);
1567 }
1568
1569 static int
link_elf_symbol_values(linker_file_t lf,c_linker_sym_t sym,linker_symval_t * symval)1570 link_elf_symbol_values(linker_file_t lf, c_linker_sym_t sym,
1571 linker_symval_t *symval)
1572 {
1573 return (link_elf_symbol_values1(lf, sym, symval,
1574 link_elf_obj_leak_locals));
1575 }
1576
1577 static int
link_elf_debug_symbol_values(linker_file_t lf,c_linker_sym_t sym,linker_symval_t * symval)1578 link_elf_debug_symbol_values(linker_file_t lf, c_linker_sym_t sym,
1579 linker_symval_t *symval)
1580 {
1581 return (link_elf_symbol_values1(lf, sym, symval, true));
1582 }
1583
1584 static int
link_elf_search_symbol(linker_file_t lf,caddr_t value,c_linker_sym_t * sym,long * diffp)1585 link_elf_search_symbol(linker_file_t lf, caddr_t value,
1586 c_linker_sym_t *sym, long *diffp)
1587 {
1588 elf_file_t ef = (elf_file_t)lf;
1589 u_long off = (uintptr_t)(void *)value;
1590 u_long diff = off;
1591 u_long st_value;
1592 const Elf_Sym *es;
1593 const Elf_Sym *best = NULL;
1594 int i;
1595
1596 for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) {
1597 if (es->st_name == 0)
1598 continue;
1599 st_value = es->st_value;
1600 if (off >= st_value) {
1601 if (off - st_value < diff) {
1602 diff = off - st_value;
1603 best = es;
1604 if (diff == 0)
1605 break;
1606 } else if (off - st_value == diff) {
1607 best = es;
1608 }
1609 }
1610 }
1611 if (best == NULL)
1612 *diffp = off;
1613 else
1614 *diffp = diff;
1615 *sym = (c_linker_sym_t) best;
1616
1617 return (0);
1618 }
1619
1620 /*
1621 * Look up a linker set on an ELF system.
1622 */
1623 static int
link_elf_lookup_set(linker_file_t lf,const char * name,void *** startp,void *** stopp,int * countp)1624 link_elf_lookup_set(linker_file_t lf, const char *name,
1625 void ***startp, void ***stopp, int *countp)
1626 {
1627 elf_file_t ef = (elf_file_t)lf;
1628 void **start, **stop;
1629 int i, count;
1630
1631 /* Relative to section number */
1632 for (i = 0; i < ef->nprogtab; i++) {
1633 if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) &&
1634 strcmp(ef->progtab[i].name + 4, name) == 0) {
1635 start = (void **)ef->progtab[i].addr;
1636 stop = (void **)((char *)ef->progtab[i].addr +
1637 ef->progtab[i].size);
1638 count = stop - start;
1639 if (startp)
1640 *startp = start;
1641 if (stopp)
1642 *stopp = stop;
1643 if (countp)
1644 *countp = count;
1645 return (0);
1646 }
1647 }
1648 return (ESRCH);
1649 }
1650
1651 static int
link_elf_each_function_name(linker_file_t file,int (* callback)(const char *,void *),void * opaque)1652 link_elf_each_function_name(linker_file_t file,
1653 int (*callback)(const char *, void *), void *opaque)
1654 {
1655 elf_file_t ef = (elf_file_t)file;
1656 const Elf_Sym *symp;
1657 int i, error;
1658
1659 /* Exhaustive search */
1660 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1661 if (symp->st_value != 0 &&
1662 (ELF_ST_TYPE(symp->st_info) == STT_FUNC ||
1663 ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC)) {
1664 error = callback(ef->ddbstrtab + symp->st_name, opaque);
1665 if (error)
1666 return (error);
1667 }
1668 }
1669 return (0);
1670 }
1671
1672 static int
link_elf_each_function_nameval(linker_file_t file,linker_function_nameval_callback_t callback,void * opaque)1673 link_elf_each_function_nameval(linker_file_t file,
1674 linker_function_nameval_callback_t callback, void *opaque)
1675 {
1676 linker_symval_t symval;
1677 elf_file_t ef = (elf_file_t)file;
1678 const Elf_Sym *symp;
1679 int i, error;
1680
1681 /* Exhaustive search */
1682 for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1683 if (symp->st_value != 0 &&
1684 (ELF_ST_TYPE(symp->st_info) == STT_FUNC ||
1685 ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC)) {
1686 error = link_elf_debug_symbol_values(file,
1687 (c_linker_sym_t)symp, &symval);
1688 if (error == 0)
1689 error = callback(file, i, &symval, opaque);
1690 if (error != 0)
1691 return (error);
1692 }
1693 }
1694 return (0);
1695 }
1696
1697 static void
elf_obj_cleanup_globals_cache(elf_file_t ef)1698 elf_obj_cleanup_globals_cache(elf_file_t ef)
1699 {
1700 Elf_Sym *sym;
1701 Elf_Size i;
1702
1703 for (i = 0; i < ef->ddbsymcnt; i++) {
1704 sym = ef->ddbsymtab + i;
1705 if (sym->st_shndx == SHN_FBSD_CACHED) {
1706 sym->st_shndx = SHN_UNDEF;
1707 sym->st_value = 0;
1708 }
1709 }
1710 }
1711
1712 /*
1713 * Symbol lookup function that can be used when the symbol index is known (ie
1714 * in relocations). It uses the symbol index instead of doing a fully fledged
1715 * hash table based lookup when such is valid. For example for local symbols.
1716 * This is not only more efficient, it's also more correct. It's not always
1717 * the case that the symbol can be found through the hash table.
1718 */
1719 static int
elf_obj_lookup(linker_file_t lf,Elf_Size symidx,int deps,Elf_Addr * res)1720 elf_obj_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *res)
1721 {
1722 elf_file_t ef = (elf_file_t)lf;
1723 Elf_Sym *sym;
1724 const char *symbol;
1725 Elf_Addr res1;
1726
1727 /* Don't even try to lookup the symbol if the index is bogus. */
1728 if (symidx >= ef->ddbsymcnt) {
1729 *res = 0;
1730 return (EINVAL);
1731 }
1732
1733 sym = ef->ddbsymtab + symidx;
1734
1735 /* Quick answer if there is a definition included. */
1736 if (sym->st_shndx != SHN_UNDEF) {
1737 res1 = (Elf_Addr)sym->st_value;
1738 if (ELF_ST_TYPE(sym->st_info) == STT_GNU_IFUNC)
1739 res1 = ((Elf_Addr (*)(void))res1)();
1740 *res = res1;
1741 return (0);
1742 }
1743
1744 /* If we get here, then it is undefined and needs a lookup. */
1745 switch (ELF_ST_BIND(sym->st_info)) {
1746 case STB_LOCAL:
1747 /* Local, but undefined? huh? */
1748 *res = 0;
1749 return (EINVAL);
1750
1751 case STB_GLOBAL:
1752 case STB_WEAK:
1753 /* Relative to Data or Function name */
1754 symbol = ef->ddbstrtab + sym->st_name;
1755
1756 /* Force a lookup failure if the symbol name is bogus. */
1757 if (*symbol == 0) {
1758 *res = 0;
1759 return (EINVAL);
1760 }
1761 res1 = (Elf_Addr)linker_file_lookup_symbol(lf, symbol, deps);
1762
1763 /*
1764 * Cache global lookups during module relocation. The failure
1765 * case is particularly expensive for callers, who must scan
1766 * through the entire globals table doing strcmp(). Cache to
1767 * avoid doing such work repeatedly.
1768 *
1769 * After relocation is complete, undefined globals will be
1770 * restored to SHN_UNDEF in elf_obj_cleanup_globals_cache(),
1771 * above.
1772 */
1773 if (res1 != 0) {
1774 sym->st_shndx = SHN_FBSD_CACHED;
1775 sym->st_value = res1;
1776 *res = res1;
1777 return (0);
1778 } else if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1779 sym->st_value = 0;
1780 *res = 0;
1781 return (0);
1782 }
1783 return (EINVAL);
1784
1785 default:
1786 return (EINVAL);
1787 }
1788 }
1789
1790 static void
link_elf_fix_link_set(elf_file_t ef)1791 link_elf_fix_link_set(elf_file_t ef)
1792 {
1793 static const char startn[] = "__start_";
1794 static const char stopn[] = "__stop_";
1795 Elf_Sym *sym;
1796 const char *sym_name, *linkset_name;
1797 Elf_Addr startp, stopp;
1798 Elf_Size symidx;
1799 int start, i;
1800
1801 startp = stopp = 0;
1802 for (symidx = 1 /* zero entry is special */;
1803 symidx < ef->ddbsymcnt; symidx++) {
1804 sym = ef->ddbsymtab + symidx;
1805 if (sym->st_shndx != SHN_UNDEF)
1806 continue;
1807
1808 sym_name = ef->ddbstrtab + sym->st_name;
1809 if (strncmp(sym_name, startn, sizeof(startn) - 1) == 0) {
1810 start = 1;
1811 linkset_name = sym_name + sizeof(startn) - 1;
1812 }
1813 else if (strncmp(sym_name, stopn, sizeof(stopn) - 1) == 0) {
1814 start = 0;
1815 linkset_name = sym_name + sizeof(stopn) - 1;
1816 }
1817 else
1818 continue;
1819
1820 for (i = 0; i < ef->nprogtab; i++) {
1821 if (strcmp(ef->progtab[i].name, linkset_name) == 0) {
1822 startp = (Elf_Addr)ef->progtab[i].addr;
1823 stopp = (Elf_Addr)(startp + ef->progtab[i].size);
1824 break;
1825 }
1826 }
1827 if (i == ef->nprogtab)
1828 continue;
1829
1830 sym->st_value = start ? startp : stopp;
1831 sym->st_shndx = i;
1832 }
1833 }
1834
1835 static int
link_elf_reloc_local(linker_file_t lf,bool ifuncs)1836 link_elf_reloc_local(linker_file_t lf, bool ifuncs)
1837 {
1838 elf_file_t ef = (elf_file_t)lf;
1839 const Elf_Rel *rellim;
1840 const Elf_Rel *rel;
1841 const Elf_Rela *relalim;
1842 const Elf_Rela *rela;
1843 const Elf_Sym *sym;
1844 Elf_Addr base;
1845 int i;
1846 Elf_Size symidx;
1847
1848 link_elf_fix_link_set(ef);
1849
1850 /* Perform relocations without addend if there are any: */
1851 for (i = 0; i < ef->nreltab; i++) {
1852 rel = ef->reltab[i].rel;
1853 if (rel == NULL) {
1854 link_elf_error(ef->lf.filename, "lost a reltab");
1855 return (ENOEXEC);
1856 }
1857 rellim = rel + ef->reltab[i].nrel;
1858 base = findbase(ef, ef->reltab[i].sec);
1859 if (base == 0) {
1860 link_elf_error(ef->lf.filename, "lost base for reltab");
1861 return (ENOEXEC);
1862 }
1863 for ( ; rel < rellim; rel++) {
1864 symidx = ELF_R_SYM(rel->r_info);
1865 if (symidx >= ef->ddbsymcnt)
1866 continue;
1867 sym = ef->ddbsymtab + symidx;
1868 /* Only do local relocs */
1869 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1870 continue;
1871 if ((ELF_ST_TYPE(sym->st_info) == STT_GNU_IFUNC ||
1872 elf_is_ifunc_reloc(rel->r_info)) != ifuncs)
1873 continue;
1874 if (elf_reloc_local(lf, base, rel, ELF_RELOC_REL,
1875 elf_obj_lookup) != 0)
1876 return (ENOEXEC);
1877 }
1878 }
1879
1880 /* Perform relocations with addend if there are any: */
1881 for (i = 0; i < ef->nrelatab; i++) {
1882 rela = ef->relatab[i].rela;
1883 if (rela == NULL) {
1884 link_elf_error(ef->lf.filename, "lost a relatab!");
1885 return (ENOEXEC);
1886 }
1887 relalim = rela + ef->relatab[i].nrela;
1888 base = findbase(ef, ef->relatab[i].sec);
1889 if (base == 0) {
1890 link_elf_error(ef->lf.filename, "lost base for reltab");
1891 return (ENOEXEC);
1892 }
1893 for ( ; rela < relalim; rela++) {
1894 symidx = ELF_R_SYM(rela->r_info);
1895 if (symidx >= ef->ddbsymcnt)
1896 continue;
1897 sym = ef->ddbsymtab + symidx;
1898 /* Only do local relocs */
1899 if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
1900 continue;
1901 if ((ELF_ST_TYPE(sym->st_info) == STT_GNU_IFUNC ||
1902 elf_is_ifunc_reloc(rela->r_info)) != ifuncs)
1903 continue;
1904 if (elf_reloc_local(lf, base, rela, ELF_RELOC_RELA,
1905 elf_obj_lookup) != 0)
1906 return (ENOEXEC);
1907 }
1908 }
1909 return (0);
1910 }
1911
1912 static long
link_elf_symtab_get(linker_file_t lf,const Elf_Sym ** symtab)1913 link_elf_symtab_get(linker_file_t lf, const Elf_Sym **symtab)
1914 {
1915 elf_file_t ef = (elf_file_t)lf;
1916
1917 *symtab = ef->ddbsymtab;
1918 if (*symtab == NULL)
1919 return (0);
1920 return (ef->ddbsymcnt);
1921 }
1922
1923 static long
link_elf_strtab_get(linker_file_t lf,caddr_t * strtab)1924 link_elf_strtab_get(linker_file_t lf, caddr_t *strtab)
1925 {
1926 elf_file_t ef = (elf_file_t)lf;
1927
1928 *strtab = ef->ddbstrtab;
1929 if (*strtab == NULL)
1930 return (0);
1931 return (ef->ddbstrcnt);
1932 }
1933
1934 #ifdef VIMAGE
1935 static void
link_elf_propagate_vnets(linker_file_t lf)1936 link_elf_propagate_vnets(linker_file_t lf)
1937 {
1938 elf_file_t ef = (elf_file_t) lf;
1939
1940 if (ef->progtab) {
1941 for (int i = 0; i < ef->nprogtab; i++) {
1942 if (ef->progtab[i].size == 0)
1943 continue;
1944 if (ef->progtab[i].name == NULL)
1945 continue;
1946 if (strcmp(ef->progtab[i].name, VNET_SETNAME) == 0) {
1947 vnet_data_copy(ef->progtab[i].addr,
1948 ef->progtab[i].size);
1949 break;
1950 }
1951 }
1952 }
1953 }
1954 #endif
1955