1 /*
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * Copyright (c) 1998 Peter Wemm <peter@freebsd.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29
30 #include <sys/param.h>
31 #include <sys/exec.h>
32 #include <sys/linker.h>
33 #include <sys/module.h>
34 #include <sys/stdint.h>
35 #include <string.h>
36 #include <machine/elf.h>
37 #include <stand.h>
38 #define FREEBSD_ELF
39 #include <link.h>
40
41 #include "bootstrap.h"
42
43 #define COPYOUT(s, d, l) archsw.arch_copyout((vm_offset_t)(s), d, l)
44
45 #if defined(__i386__) && __ELF_WORD_SIZE == 64
46 #undef ELF_TARG_CLASS
47 #undef ELF_TARG_MACH
48 #define ELF_TARG_CLASS ELFCLASS64
49 #define ELF_TARG_MACH EM_X86_64
50 #endif
51
52 typedef struct elf_file {
53 Elf_Phdr *ph;
54 Elf_Ehdr *ehdr;
55 Elf_Sym *symtab;
56 Elf_Hashelt *hashtab;
57 Elf_Hashelt nbuckets;
58 Elf_Hashelt nchains;
59 Elf_Hashelt *buckets;
60 Elf_Hashelt *chains;
61 Elf_Rel *rel;
62 size_t relsz;
63 Elf_Rela *rela;
64 size_t relasz;
65 char *strtab;
66 size_t strsz;
67 int fd;
68 caddr_t firstpage;
69 size_t firstlen;
70 int kernel;
71 uint64_t off;
72 } *elf_file_t;
73
74 static int __elfN(loadimage)(struct preloaded_file *, elf_file_t, uint64_t);
75 static int __elfN(lookup_symbol)(struct preloaded_file *, elf_file_t,
76 const char *, Elf_Sym *);
77 static int __elfN(reloc_ptr)(struct preloaded_file *, elf_file_t,
78 Elf_Addr, void *, size_t);
79 static int __elfN(parse_modmetadata)(struct preloaded_file *, elf_file_t,
80 Elf_Addr, Elf_Addr);
81 static symaddr_fn __elfN(symaddr);
82 static char *fake_modname(const char *);
83
84 const char *__elfN(kerneltype) = "elf kernel";
85 const char *__elfN(moduletype) = "elf module";
86
87 uint64_t __elfN(relocation_offset) = 0;
88
89 static int
__elfN(load_elf_header)90 __elfN(load_elf_header)(char *filename, elf_file_t ef)
91 {
92 ssize_t bytes_read;
93 Elf_Ehdr *ehdr;
94 int err;
95
96 /*
97 * Open the image, read and validate the ELF header
98 */
99 if (filename == NULL) /* can't handle nameless */
100 return (EFTYPE);
101 if ((ef->fd = open(filename, O_RDONLY)) == -1)
102 return (errno);
103 ef->firstpage = malloc(PAGE_SIZE);
104 if (ef->firstpage == NULL) {
105 close(ef->fd);
106 return (ENOMEM);
107 }
108 bytes_read = read(ef->fd, ef->firstpage, PAGE_SIZE);
109 ef->firstlen = (size_t)bytes_read;
110 if (bytes_read < 0 || ef->firstlen <= sizeof (Elf_Ehdr)) {
111 err = EFTYPE; /* could be EIO, but may be small file */
112 goto error;
113 }
114 ehdr = ef->ehdr = (Elf_Ehdr *)ef->firstpage;
115
116 /* Is it ELF? */
117 if (!IS_ELF(*ehdr)) {
118 err = EFTYPE;
119 goto error;
120 }
121 if (ehdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || /* Layout ? */
122 ehdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
123 ehdr->e_ident[EI_VERSION] != EV_CURRENT || /* Version ? */
124 ehdr->e_version != EV_CURRENT ||
125 ehdr->e_machine != ELF_TARG_MACH) { /* Machine ? */
126 err = EFTYPE;
127 goto error;
128 }
129
130 return (0);
131
132 error:
133 if (ef->firstpage != NULL) {
134 free(ef->firstpage);
135 ef->firstpage = NULL;
136 }
137 if (ef->fd != -1) {
138 close(ef->fd);
139 ef->fd = -1;
140 }
141 return (err);
142 }
143
144 /*
145 * Attempt to load the file (file) as an ELF module. It will be stored at
146 * (dest), and a pointer to a module structure describing the loaded object
147 * will be saved in (result).
148 */
149 int
__elfN(loadfile)150 __elfN(loadfile)(char *filename, uint64_t dest, struct preloaded_file **result)
151 {
152 return (__elfN(loadfile_raw)(filename, dest, result, 0));
153 }
154
155 int
__elfN(loadfile_raw)156 __elfN(loadfile_raw)(char *filename, uint64_t dest,
157 struct preloaded_file **result, int multiboot)
158 {
159 struct preloaded_file *fp, *kfp;
160 struct elf_file ef;
161 Elf_Ehdr *ehdr;
162 int err;
163
164 fp = NULL;
165 bzero(&ef, sizeof (struct elf_file));
166 ef.fd = -1;
167
168 err = __elfN(load_elf_header)(filename, &ef);
169 if (err != 0)
170 return (err);
171
172 ehdr = ef.ehdr;
173
174 /*
175 * Check to see what sort of module we are.
176 */
177 kfp = file_findfile(NULL, __elfN(kerneltype));
178 #ifdef __powerpc__
179 /*
180 * Kernels can be ET_DYN, so just assume the first loaded object is the
181 * kernel. This assumption will be checked later.
182 */
183 if (kfp == NULL)
184 ef.kernel = 1;
185 #endif
186 if (ef.kernel || ehdr->e_type == ET_EXEC) {
187 /* Looks like a kernel */
188 if (kfp != NULL) {
189 printf("elf" __XSTRING(__ELF_WORD_SIZE)
190 "_loadfile: kernel already loaded\n");
191 err = EPERM;
192 goto oerr;
193 }
194 /*
195 * Calculate destination address based on kernel entrypoint.
196 *
197 * For ARM, the destination address is independent of any
198 * values in the elf header (an ARM kernel can be loaded at
199 * any 2MB boundary), so we leave dest set to the value
200 * calculated by archsw.arch_loadaddr() and passed in to
201 * this function.
202 */
203 #ifndef __arm__
204 if (ehdr->e_type == ET_EXEC)
205 dest = (ehdr->e_entry & ~PAGE_MASK);
206 #endif
207 if ((ehdr->e_entry & ~PAGE_MASK) == 0) {
208 printf("elf" __XSTRING(__ELF_WORD_SIZE)
209 "_loadfile: not a kernel (maybe static binary?)\n");
210 err = EPERM;
211 goto oerr;
212 }
213 ef.kernel = 1;
214
215 } else if (ehdr->e_type == ET_DYN) {
216 /* Looks like a kld module */
217 if (multiboot != 0) {
218 printf("elf" __XSTRING(__ELF_WORD_SIZE)
219 "_loadfile: can't load module as multiboot\n");
220 err = EPERM;
221 goto oerr;
222 }
223 if (kfp == NULL) {
224 printf("elf" __XSTRING(__ELF_WORD_SIZE)
225 "_loadfile: can't load module before kernel\n");
226 err = EPERM;
227 goto oerr;
228 }
229 if (strcmp(__elfN(kerneltype), kfp->f_type)) {
230 printf("elf" __XSTRING(__ELF_WORD_SIZE)
231 "_loadfile: can't load module with "
232 "kernel type '%s'\n", kfp->f_type);
233 err = EPERM;
234 goto oerr;
235 }
236 /* Looks OK, got ahead */
237 ef.kernel = 0;
238 } else {
239 err = EFTYPE;
240 goto oerr;
241 }
242
243 if (archsw.arch_loadaddr != NULL)
244 dest = archsw.arch_loadaddr(LOAD_ELF, ehdr, dest);
245 else
246 dest = roundup(dest, PAGE_SIZE);
247
248 /*
249 * Ok, we think we should handle this.
250 */
251 fp = file_alloc();
252 if (fp == NULL) {
253 printf("elf" __XSTRING(__ELF_WORD_SIZE)
254 "_loadfile: cannot allocate module info\n");
255 err = EPERM;
256 goto out;
257 }
258 if (ef.kernel == 1 && multiboot == 0)
259 setenv("kernelname", filename, 1);
260 fp->f_name = strdup(filename);
261 if (multiboot == 0) {
262 fp->f_type = strdup(ef.kernel ?
263 __elfN(kerneltype) : __elfN(moduletype));
264 } else {
265 if (multiboot == 1)
266 fp->f_type = strdup("elf multiboot kernel");
267 else
268 fp->f_type = strdup("elf multiboot2 kernel");
269 }
270
271 #ifdef ELF_VERBOSE
272 if (ef.kernel)
273 printf("%s entry at 0x%jx\n", filename,
274 (uintmax_t)ehdr->e_entry);
275 #else
276 printf("%s ", filename);
277 #endif
278
279 fp->f_size = __elfN(loadimage)(fp, &ef, dest);
280 if (fp->f_size == 0 || fp->f_addr == 0)
281 goto ioerr;
282
283 /* save exec header as metadata */
284 file_addmetadata(fp, MODINFOMD_ELFHDR, sizeof (*ehdr), ehdr);
285
286 /* Load OK, return module pointer */
287 *result = (struct preloaded_file *)fp;
288 err = 0;
289 goto out;
290
291 ioerr:
292 err = EIO;
293 oerr:
294 file_discard(fp);
295 out:
296 if (ef.firstpage)
297 free(ef.firstpage);
298 if (ef.fd != -1)
299 close(ef.fd);
300 return (err);
301 }
302
303 /*
304 * With the file (fd) open on the image, and (ehdr) containing
305 * the Elf header, load the image at (off)
306 */
307 static int
__elfN(loadimage)308 __elfN(loadimage)(struct preloaded_file *fp, elf_file_t ef, uint64_t off)
309 {
310 int i;
311 uint_t j;
312 Elf_Ehdr *ehdr;
313 Elf_Phdr *phdr, *php;
314 Elf_Shdr *shdr;
315 char *shstr;
316 int ret;
317 vm_offset_t firstaddr;
318 vm_offset_t lastaddr;
319 size_t chunk;
320 ssize_t result;
321 Elf_Addr ssym, esym;
322 Elf_Dyn *dp;
323 Elf_Addr adp;
324 Elf_Addr ctors;
325 int ndp;
326 int symstrindex;
327 int symtabindex;
328 Elf_Size size;
329 uint_t fpcopy;
330 Elf_Sym sym;
331 Elf_Addr p_start, p_end;
332
333 dp = NULL;
334 shdr = NULL;
335 ret = 0;
336 firstaddr = lastaddr = 0;
337 ehdr = ef->ehdr;
338 if (ehdr->e_type == ET_EXEC) {
339 #if defined(__i386__) || defined(__amd64__)
340 #if __ELF_WORD_SIZE == 64
341 /* x86_64 relocates after locore */
342 off = - (off & 0xffffffffff000000ull);
343 #else
344 /* i386 relocates after locore */
345 off = - (off & 0xff000000u);
346 #endif
347 #elif defined(__powerpc__)
348 /*
349 * On the purely virtual memory machines like e500, the kernel
350 * is linked against its final VA range, which is most often
351 * not available at the loader stage, but only after kernel
352 * initializes and completes its VM settings. In such cases
353 * we cannot use p_vaddr field directly to load ELF segments,
354 * but put them at some 'load-time' locations.
355 */
356 if (off & 0xf0000000u) {
357 off = -(off & 0xf0000000u);
358 /*
359 * XXX the physical load address should not be
360 * hardcoded. Note that the Book-E kernel assumes
361 * that it's loaded at a 16MB boundary for now...
362 */
363 off += 0x01000000;
364 ehdr->e_entry += off;
365 #ifdef ELF_VERBOSE
366 printf("Converted entry 0x%08x\n", ehdr->e_entry);
367 #endif
368 } else {
369 off = 0;
370 }
371 #elif defined(__arm__) && !defined(EFI)
372 /*
373 * The elf headers in arm kernels specify virtual addresses
374 * in all header fields, even the ones that should be physical
375 * addresses.
376 * We assume the entry point is in the first page, and masking
377 * the page offset will leave us with the virtual address the
378 * kernel was linked at. We subtract that from the load offset,
379 * making 'off' into the value which, when added to a virtual
380 * address in an elf header, translates it to a physical
381 * address. We do the va->pa conversion on the entry point
382 * address in the header now, so that later we can
383 * launch the kernel by just jumping to that address.
384 *
385 * When booting from UEFI the copyin and copyout functions
386 * handle adjusting the location relative to the first virtual
387 * address. Because of this there is no need to adjust the
388 * offset or entry point address as these will both be handled
389 * by the efi code.
390 */
391 off -= ehdr->e_entry & ~PAGE_MASK;
392 ehdr->e_entry += off;
393 #ifdef ELF_VERBOSE
394 printf("ehdr->e_entry 0x%08x, va<->pa off %llx\n",
395 ehdr->e_entry, off);
396 #endif
397 #else
398 off = 0; /* other archs use direct mapped kernels */
399 #endif
400 }
401 ef->off = off;
402
403 if (ehdr->e_ident[EI_OSABI] == ELFOSABI_SOLARIS) {
404 /* use entry address from header */
405 fp->f_addr = ehdr->e_entry;
406 }
407
408 if (ef->kernel)
409 __elfN(relocation_offset) = off;
410
411 if ((ehdr->e_phoff + ehdr->e_phnum * sizeof (*phdr)) > ef->firstlen) {
412 printf("elf" __XSTRING(__ELF_WORD_SIZE)
413 "_loadimage: program header not within first page\n");
414 goto out;
415 }
416 phdr = (Elf_Phdr *)(ef->firstpage + ehdr->e_phoff);
417
418 for (i = 0; i < ehdr->e_phnum; i++) {
419 /* We want to load PT_LOAD segments only.. */
420 if (phdr[i].p_type != PT_LOAD)
421 continue;
422
423 #ifdef ELF_VERBOSE
424 if (ehdr->e_ident[EI_OSABI] == ELFOSABI_SOLARIS) {
425 printf("Segment: 0x%lx@0x%lx -> 0x%lx-0x%lx",
426 (long)phdr[i].p_filesz, (long)phdr[i].p_offset,
427 (long)(phdr[i].p_paddr + off),
428 (long)(phdr[i].p_paddr + off +
429 phdr[i].p_memsz - 1));
430 } else {
431 printf("Segment: 0x%lx@0x%lx -> 0x%lx-0x%lx",
432 (long)phdr[i].p_filesz, (long)phdr[i].p_offset,
433 (long)(phdr[i].p_vaddr + off),
434 (long)(phdr[i].p_vaddr + off +
435 phdr[i].p_memsz - 1));
436 }
437 #else
438 if ((phdr[i].p_flags & PF_W) == 0) {
439 printf("text=0x%lx ", (long)phdr[i].p_filesz);
440 } else {
441 printf("data=0x%lx", (long)phdr[i].p_filesz);
442 if (phdr[i].p_filesz < phdr[i].p_memsz)
443 printf("+0x%lx",
444 (long)(phdr[i].p_memsz -phdr[i].p_filesz));
445 printf(" ");
446 }
447 #endif
448 fpcopy = 0;
449 if (ef->firstlen > phdr[i].p_offset) {
450 fpcopy = ef->firstlen - phdr[i].p_offset;
451 if (ehdr->e_ident[EI_OSABI] == ELFOSABI_SOLARIS) {
452 archsw.arch_copyin(ef->firstpage +
453 phdr[i].p_offset,
454 phdr[i].p_paddr + off, fpcopy);
455 } else {
456 archsw.arch_copyin(ef->firstpage +
457 phdr[i].p_offset,
458 phdr[i].p_vaddr + off, fpcopy);
459 }
460 }
461 if (phdr[i].p_filesz > fpcopy) {
462 if (ehdr->e_ident[EI_OSABI] == ELFOSABI_SOLARIS) {
463 if (kern_pread(ef->fd,
464 phdr[i].p_paddr + off + fpcopy,
465 phdr[i].p_filesz - fpcopy,
466 phdr[i].p_offset + fpcopy) != 0) {
467 printf("\nelf"
468 __XSTRING(__ELF_WORD_SIZE)
469 "_loadimage: read failed\n");
470 goto out;
471 }
472 } else {
473 if (kern_pread(ef->fd,
474 phdr[i].p_vaddr + off + fpcopy,
475 phdr[i].p_filesz - fpcopy,
476 phdr[i].p_offset + fpcopy) != 0) {
477 printf("\nelf"
478 __XSTRING(__ELF_WORD_SIZE)
479 "_loadimage: read failed\n");
480 goto out;
481 }
482 }
483 }
484 /* clear space from oversized segments; eg: bss */
485 if (phdr[i].p_filesz < phdr[i].p_memsz) {
486 #ifdef ELF_VERBOSE
487 if (ehdr->e_ident[EI_OSABI] == ELFOSABI_SOLARIS) {
488 printf(" (bss: 0x%lx-0x%lx)",
489 (long)(phdr[i].p_paddr + off +
490 phdr[i].p_filesz),
491 (long)(phdr[i].p_paddr + off +
492 phdr[i].p_memsz - 1));
493 } else {
494 printf(" (bss: 0x%lx-0x%lx)",
495 (long)(phdr[i].p_vaddr + off +
496 phdr[i].p_filesz),
497 (long)(phdr[i].p_vaddr + off +
498 phdr[i].p_memsz - 1));
499 }
500 #endif
501
502 if (ehdr->e_ident[EI_OSABI] == ELFOSABI_SOLARIS) {
503 kern_bzero(phdr[i].p_paddr + off +
504 phdr[i].p_filesz,
505 phdr[i].p_memsz - phdr[i].p_filesz);
506 } else {
507 kern_bzero(phdr[i].p_vaddr + off +
508 phdr[i].p_filesz,
509 phdr[i].p_memsz - phdr[i].p_filesz);
510 }
511 }
512 #ifdef ELF_VERBOSE
513 printf("\n");
514 #endif
515
516 if (archsw.arch_loadseg != NULL)
517 archsw.arch_loadseg(ehdr, phdr + i, off);
518
519 if (ehdr->e_ident[EI_OSABI] == ELFOSABI_SOLARIS) {
520 if (firstaddr == 0 ||
521 firstaddr > (phdr[i].p_paddr + off))
522 firstaddr = phdr[i].p_paddr + off;
523 if (lastaddr == 0 || lastaddr <
524 (phdr[i].p_paddr + off + phdr[i].p_memsz))
525 lastaddr = phdr[i].p_paddr + off +
526 phdr[i].p_memsz;
527 } else {
528 if (firstaddr == 0 ||
529 firstaddr > (phdr[i].p_vaddr + off))
530 firstaddr = phdr[i].p_vaddr + off;
531 if (lastaddr == 0 || lastaddr <
532 (phdr[i].p_vaddr + off + phdr[i].p_memsz))
533 lastaddr = phdr[i].p_vaddr + off +
534 phdr[i].p_memsz;
535 }
536 }
537 lastaddr = roundup(lastaddr, sizeof (long));
538
539 /*
540 * Get the section headers. We need this for finding the .ctors
541 * section as well as for loading any symbols. Both may be hard
542 * to do if reading from a .gz file as it involves seeking. I
543 * think the rule is going to have to be that you must strip a
544 * file to remove symbols before gzipping it.
545 */
546 chunk = ehdr->e_shnum * ehdr->e_shentsize;
547 if (chunk == 0 || ehdr->e_shoff == 0)
548 goto nosyms;
549 shdr = alloc_pread(ef->fd, ehdr->e_shoff, chunk);
550 if (shdr == NULL) {
551 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
552 "_loadimage: failed to read section headers");
553 goto nosyms;
554 }
555 file_addmetadata(fp, MODINFOMD_SHDR, chunk, shdr);
556
557 /*
558 * Read the section string table and look for the .ctors section.
559 * We need to tell the kernel where it is so that it can call the
560 * ctors.
561 */
562 chunk = shdr[ehdr->e_shstrndx].sh_size;
563 if (chunk) {
564 shstr = alloc_pread(ef->fd, shdr[ehdr->e_shstrndx].sh_offset,
565 chunk);
566 if (shstr) {
567 for (i = 0; i < ehdr->e_shnum; i++) {
568 if (strcmp(shstr + shdr[i].sh_name,
569 ".ctors") != 0)
570 continue;
571 ctors = shdr[i].sh_addr;
572 file_addmetadata(fp, MODINFOMD_CTORS_ADDR,
573 sizeof (ctors), &ctors);
574 size = shdr[i].sh_size;
575 file_addmetadata(fp, MODINFOMD_CTORS_SIZE,
576 sizeof (size), &size);
577 break;
578 }
579 free(shstr);
580 }
581 }
582
583 /*
584 * Now load any symbols.
585 */
586 symtabindex = -1;
587 symstrindex = -1;
588 for (i = 0; i < ehdr->e_shnum; i++) {
589 if (shdr[i].sh_type != SHT_SYMTAB)
590 continue;
591 for (j = 0; j < ehdr->e_phnum; j++) {
592 if (phdr[j].p_type != PT_LOAD)
593 continue;
594 if (shdr[i].sh_offset >= phdr[j].p_offset &&
595 (shdr[i].sh_offset + shdr[i].sh_size <=
596 phdr[j].p_offset + phdr[j].p_filesz)) {
597 shdr[i].sh_offset = 0;
598 shdr[i].sh_size = 0;
599 break;
600 }
601 }
602 if (shdr[i].sh_offset == 0 || shdr[i].sh_size == 0)
603 continue; /* alread loaded in a PT_LOAD above */
604 /* Save it for loading below */
605 symtabindex = i;
606 symstrindex = shdr[i].sh_link;
607 }
608 if (symtabindex < 0 || symstrindex < 0)
609 goto nosyms;
610
611 /* Ok, committed to a load. */
612 #ifndef ELF_VERBOSE
613 printf("syms=[");
614 #endif
615 ssym = lastaddr;
616 for (i = symtabindex; i >= 0; i = symstrindex) {
617 #ifdef ELF_VERBOSE
618 char *secname;
619
620 switch (shdr[i].sh_type) {
621 case SHT_SYMTAB: /* Symbol table */
622 secname = "symtab";
623 break;
624 case SHT_STRTAB: /* String table */
625 secname = "strtab";
626 break;
627 default:
628 secname = "WHOA!!";
629 break;
630 }
631 #endif
632
633 size = shdr[i].sh_size;
634 archsw.arch_copyin(&size, lastaddr, sizeof (size));
635 lastaddr += sizeof (size);
636
637 #ifdef ELF_VERBOSE
638 printf("\n%s: 0x%jx@0x%jx -> 0x%jx-0x%jx", secname,
639 (uintmax_t)shdr[i].sh_size, (uintmax_t)shdr[i].sh_offset,
640 (uintmax_t)lastaddr,
641 (uintmax_t)(lastaddr + shdr[i].sh_size));
642 #else
643 if (i == symstrindex)
644 printf("+");
645 printf("0x%lx+0x%lx", (long)sizeof (size), (long)size);
646 #endif
647
648 if (lseek(ef->fd, (off_t)shdr[i].sh_offset, SEEK_SET) == -1) {
649 printf("\nelf" __XSTRING(__ELF_WORD_SIZE) "_loadimage:"
650 " could not seek for symbols - skipped!");
651 lastaddr = ssym;
652 ssym = 0;
653 goto nosyms;
654 }
655 result = archsw.arch_readin(ef->fd, lastaddr, shdr[i].sh_size);
656 if (result < 0 || (size_t)result != shdr[i].sh_size) {
657 printf("\nelf" __XSTRING(__ELF_WORD_SIZE) "_loadimage: "
658 "could not read symbols - skipped! (%ju != %ju)",
659 (uintmax_t)result, (uintmax_t)shdr[i].sh_size);
660 lastaddr = ssym;
661 ssym = 0;
662 goto nosyms;
663 }
664 /* Reset offsets relative to ssym */
665 lastaddr += shdr[i].sh_size;
666 lastaddr = roundup(lastaddr, sizeof (size));
667 if (i == symtabindex)
668 symtabindex = -1;
669 else if (i == symstrindex)
670 symstrindex = -1;
671 }
672 esym = lastaddr;
673 #ifndef ELF_VERBOSE
674 printf("]");
675 #endif
676
677 file_addmetadata(fp, MODINFOMD_SSYM, sizeof (ssym), &ssym);
678 file_addmetadata(fp, MODINFOMD_ESYM, sizeof (esym), &esym);
679
680 nosyms:
681 printf("\n");
682
683 ret = lastaddr - firstaddr;
684 if (ehdr->e_ident[EI_OSABI] != ELFOSABI_SOLARIS)
685 fp->f_addr = firstaddr;
686
687 php = NULL;
688 for (i = 0; i < ehdr->e_phnum; i++) {
689 if (phdr[i].p_type == PT_DYNAMIC) {
690 php = phdr + i;
691 adp = php->p_vaddr;
692 file_addmetadata(fp, MODINFOMD_DYNAMIC,
693 sizeof (adp), &adp);
694 break;
695 }
696 }
697
698 if (php == NULL) /* this is bad, we cannot get to symbols or _DYNAMIC */
699 goto out;
700
701 ndp = php->p_filesz / sizeof (Elf_Dyn);
702 if (ndp == 0)
703 goto out;
704 dp = malloc(php->p_filesz);
705 if (dp == NULL)
706 goto out;
707 if (ehdr->e_ident[EI_OSABI] == ELFOSABI_SOLARIS)
708 archsw.arch_copyout(php->p_paddr + off, dp, php->p_filesz);
709 else
710 archsw.arch_copyout(php->p_vaddr + off, dp, php->p_filesz);
711
712 ef->strsz = 0;
713 for (i = 0; i < ndp; i++) {
714 if (dp[i].d_tag == 0)
715 break;
716 switch (dp[i].d_tag) {
717 case DT_HASH:
718 ef->hashtab = (Elf_Hashelt*)(uintptr_t)
719 (dp[i].d_un.d_ptr + off);
720 break;
721 case DT_STRTAB:
722 ef->strtab = (char *)(uintptr_t)
723 (dp[i].d_un.d_ptr + off);
724 break;
725 case DT_STRSZ:
726 ef->strsz = dp[i].d_un.d_val;
727 break;
728 case DT_SYMTAB:
729 ef->symtab = (Elf_Sym*)(uintptr_t)
730 (dp[i].d_un.d_ptr + off);
731 break;
732 case DT_REL:
733 ef->rel = (Elf_Rel *)(uintptr_t)
734 (dp[i].d_un.d_ptr + off);
735 break;
736 case DT_RELSZ:
737 ef->relsz = dp[i].d_un.d_val;
738 break;
739 case DT_RELA:
740 ef->rela = (Elf_Rela *)(uintptr_t)
741 (dp[i].d_un.d_ptr + off);
742 break;
743 case DT_RELASZ:
744 ef->relasz = dp[i].d_un.d_val;
745 break;
746 default:
747 break;
748 }
749 }
750 if (ef->hashtab == NULL || ef->symtab == NULL ||
751 ef->strtab == NULL || ef->strsz == 0)
752 goto out;
753 COPYOUT(ef->hashtab, &ef->nbuckets, sizeof (ef->nbuckets));
754 COPYOUT(ef->hashtab + 1, &ef->nchains, sizeof (ef->nchains));
755 ef->buckets = ef->hashtab + 2;
756 ef->chains = ef->buckets + ef->nbuckets;
757
758 if (__elfN(lookup_symbol)(fp, ef, "__start_set_modmetadata_set",
759 &sym) != 0)
760 return (0);
761 p_start = sym.st_value + ef->off;
762 if (__elfN(lookup_symbol)(fp, ef, "__stop_set_modmetadata_set",
763 &sym) != 0)
764 return (ENOENT);
765 p_end = sym.st_value + ef->off;
766
767 if (__elfN(parse_modmetadata)(fp, ef, p_start, p_end) == 0)
768 goto out;
769
770 if (ef->kernel) /* kernel must not depend on anything */
771 goto out;
772
773 out:
774 free(dp);
775 free(shdr);
776 return (ret);
777 }
778
779 static char invalid_name[] = "bad";
780
781 char *
fake_modname(const char * name)782 fake_modname(const char *name)
783 {
784 const char *sp, *ep;
785 char *fp;
786 size_t len;
787
788 sp = strrchr(name, '/');
789 if (sp)
790 sp++;
791 else
792 sp = name;
793 ep = strrchr(name, '.');
794 if (ep) {
795 if (ep == name) {
796 sp = invalid_name;
797 ep = invalid_name + sizeof (invalid_name) - 1;
798 }
799 } else {
800 ep = name + strlen(name);
801 }
802 len = ep - sp;
803 fp = malloc(len + 1);
804 if (fp == NULL)
805 return (NULL);
806 memcpy(fp, sp, len);
807 fp[len] = '\0';
808 return (fp);
809 }
810
811 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
812 struct mod_metadata64 {
813 int md_version; /* structure version MDTV_* */
814 int md_type; /* type of entry MDT_* */
815 uint64_t md_data; /* specific data */
816 uint64_t md_cval; /* common string label */
817 };
818 #endif
819 #if defined(__amd64__) && __ELF_WORD_SIZE == 32
820 struct mod_metadata32 {
821 int md_version; /* structure version MDTV_* */
822 int md_type; /* type of entry MDT_* */
823 uint32_t md_data; /* specific data */
824 uint32_t md_cval; /* common string label */
825 };
826 #endif
827
828 int
__elfN(load_modmetadata)829 __elfN(load_modmetadata)(struct preloaded_file *fp, uint64_t dest)
830 {
831 struct elf_file ef;
832 int err, i, j;
833 Elf_Shdr *sh_meta, *shdr = NULL;
834 Elf_Shdr *sh_data[2];
835 char *shstrtab = NULL;
836 size_t size;
837 Elf_Addr p_start, p_end;
838
839 bzero(&ef, sizeof (struct elf_file));
840 ef.fd = -1;
841
842 err = __elfN(load_elf_header)(fp->f_name, &ef);
843 if (err != 0)
844 goto out;
845
846 if (ef.kernel == 1 || ef.ehdr->e_type == ET_EXEC) {
847 ef.kernel = 1;
848 } else if (ef.ehdr->e_type != ET_DYN) {
849 err = EFTYPE;
850 goto out;
851 }
852
853 size = ef.ehdr->e_shnum * ef.ehdr->e_shentsize;
854 shdr = alloc_pread(ef.fd, ef.ehdr->e_shoff, size);
855 if (shdr == NULL) {
856 err = ENOMEM;
857 goto out;
858 }
859
860 /* Load shstrtab. */
861 shstrtab = alloc_pread(ef.fd, shdr[ef.ehdr->e_shstrndx].sh_offset,
862 shdr[ef.ehdr->e_shstrndx].sh_size);
863 if (shstrtab == NULL) {
864 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
865 "load_modmetadata: unable to load shstrtab\n");
866 err = EFTYPE;
867 goto out;
868 }
869
870 /* Find set_modmetadata_set and data sections. */
871 sh_data[0] = sh_data[1] = sh_meta = NULL;
872 for (i = 0, j = 0; i < ef.ehdr->e_shnum; i++) {
873 if (strcmp(&shstrtab[shdr[i].sh_name],
874 "set_modmetadata_set") == 0) {
875 sh_meta = &shdr[i];
876 }
877 if ((strcmp(&shstrtab[shdr[i].sh_name], ".data") == 0) ||
878 (strcmp(&shstrtab[shdr[i].sh_name], ".rodata") == 0)) {
879 sh_data[j++] = &shdr[i];
880 }
881 }
882 if (sh_meta == NULL || sh_data[0] == NULL || sh_data[1] == NULL) {
883 printf("\nelf" __XSTRING(__ELF_WORD_SIZE) "load_modmetadata: "
884 "unable to find set_modmetadata_set or data sections\n");
885 err = EFTYPE;
886 goto out;
887 }
888
889 /* Load set_modmetadata_set into memory */
890 err = kern_pread(ef.fd, dest, sh_meta->sh_size, sh_meta->sh_offset);
891 if (err != 0) {
892 printf("\nelf" __XSTRING(__ELF_WORD_SIZE) "load_modmetadata: "
893 "unable to load set_modmetadata_set: %d\n", err);
894 goto out;
895 }
896 p_start = dest;
897 p_end = dest + sh_meta->sh_size;
898 dest += sh_meta->sh_size;
899
900 /* Load data sections into memory. */
901 err = kern_pread(ef.fd, dest, sh_data[0]->sh_size,
902 sh_data[0]->sh_offset);
903 if (err != 0) {
904 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
905 "load_modmetadata: unable to load data: %d\n", err);
906 goto out;
907 }
908
909 /*
910 * We have to increment the dest, so that the offset is the same into
911 * both the .rodata and .data sections.
912 */
913 ef.off = -(sh_data[0]->sh_addr - dest);
914 dest += (sh_data[1]->sh_addr - sh_data[0]->sh_addr);
915
916 err = kern_pread(ef.fd, dest, sh_data[1]->sh_size,
917 sh_data[1]->sh_offset);
918 if (err != 0) {
919 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
920 "load_modmetadata: unable to load data: %d\n", err);
921 goto out;
922 }
923
924 err = __elfN(parse_modmetadata)(fp, &ef, p_start, p_end);
925 if (err != 0) {
926 printf("\nelf" __XSTRING(__ELF_WORD_SIZE)
927 "load_modmetadata: unable to parse metadata: %d\n", err);
928 goto out;
929 }
930
931 out:
932 if (shstrtab != NULL)
933 free(shstrtab);
934 if (shdr != NULL)
935 free(shdr);
936 if (ef.firstpage != NULL)
937 free(ef.firstpage);
938 if (ef.fd != -1)
939 close(ef.fd);
940 return (err);
941 }
942
943 int
__elfN(parse_modmetadata)944 __elfN(parse_modmetadata)(struct preloaded_file *fp, elf_file_t ef,
945 Elf_Addr p_start, Elf_Addr p_end)
946 {
947 struct mod_metadata md;
948 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
949 struct mod_metadata64 md64;
950 #elif defined(__amd64__) && __ELF_WORD_SIZE == 32
951 struct mod_metadata32 md32;
952 #endif
953 struct mod_depend *mdepend;
954 struct mod_version mver;
955 char *s;
956 int error, modcnt, minfolen;
957 Elf_Addr v, p;
958
959 modcnt = 0;
960 p = p_start;
961 while (p < p_end) {
962 COPYOUT(p, &v, sizeof (v));
963 error = __elfN(reloc_ptr)(fp, ef, p, &v, sizeof (v));
964 if (error == EOPNOTSUPP)
965 v += ef->off;
966 else if (error != 0)
967 return (error);
968 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64
969 COPYOUT(v, &md64, sizeof (md64));
970 error = __elfN(reloc_ptr)(fp, ef, v, &md64, sizeof (md64));
971 if (error == EOPNOTSUPP) {
972 md64.md_cval += ef->off;
973 md64.md_data += ef->off;
974 } else if (error != 0)
975 return (error);
976 md.md_version = md64.md_version;
977 md.md_type = md64.md_type;
978 md.md_cval = (const char *)(uintptr_t)md64.md_cval;
979 md.md_data = (void *)(uintptr_t)md64.md_data;
980 #elif defined(__amd64__) && __ELF_WORD_SIZE == 32
981 COPYOUT(v, &md32, sizeof (md32));
982 error = __elfN(reloc_ptr)(fp, ef, v, &md32, sizeof (md32));
983 if (error == EOPNOTSUPP) {
984 md32.md_cval += ef->off;
985 md32.md_data += ef->off;
986 } else if (error != 0)
987 return (error);
988 md.md_version = md32.md_version;
989 md.md_type = md32.md_type;
990 md.md_cval = (const char *)(uintptr_t)md32.md_cval;
991 md.md_data = (void *)(uintptr_t)md32.md_data;
992 #else
993 COPYOUT(v, &md, sizeof (md));
994 error = __elfN(reloc_ptr)(fp, ef, v, &md, sizeof (md));
995 if (error == EOPNOTSUPP) {
996 md.md_cval += ef->off;
997 md.md_data = (void *)((uintptr_t)md.md_data +
998 (uintptr_t)ef->off);
999 } else if (error != 0)
1000 return (error);
1001 #endif
1002 p += sizeof (Elf_Addr);
1003 switch (md.md_type) {
1004 case MDT_DEPEND:
1005 if (ef->kernel) /* kernel must not depend on anything */
1006 break;
1007 s = strdupout((vm_offset_t)md.md_cval);
1008 minfolen = sizeof (*mdepend) + strlen(s) + 1;
1009 mdepend = malloc(minfolen);
1010 if (mdepend == NULL)
1011 return (ENOMEM);
1012 COPYOUT((vm_offset_t)md.md_data, mdepend,
1013 sizeof (*mdepend));
1014 strcpy((char *)(mdepend + 1), s);
1015 free(s);
1016 file_addmetadata(fp, MODINFOMD_DEPLIST, minfolen,
1017 mdepend);
1018 free(mdepend);
1019 break;
1020 case MDT_VERSION:
1021 s = strdupout((vm_offset_t)md.md_cval);
1022 COPYOUT((vm_offset_t)md.md_data, &mver, sizeof (mver));
1023 file_addmodule(fp, s, mver.mv_version, NULL);
1024 free(s);
1025 modcnt++;
1026 break;
1027 }
1028 }
1029 if (modcnt == 0) {
1030 s = fake_modname(fp->f_name);
1031 file_addmodule(fp, s, 1, NULL);
1032 free(s);
1033 }
1034 return (0);
1035 }
1036
1037 static unsigned long
elf_hash(const char * name)1038 elf_hash(const char *name)
1039 {
1040 const unsigned char *p = (const unsigned char *) name;
1041 unsigned long h = 0;
1042 unsigned long g;
1043
1044 while (*p != '\0') {
1045 h = (h << 4) + *p++;
1046 if ((g = h & 0xf0000000) != 0)
1047 h ^= g >> 24;
1048 h &= ~g;
1049 }
1050 return (h);
1051 }
1052
1053 static const char __elfN(bad_symtable)[] = "elf" __XSTRING(__ELF_WORD_SIZE)
1054 "_lookup_symbol: corrupt symbol table\n";
1055
1056 int
__elfN(lookup_symbol)1057 __elfN(lookup_symbol)(struct preloaded_file *fp __unused, elf_file_t ef,
1058 const char *name, Elf_Sym *symp)
1059 {
1060 Elf_Hashelt symnum;
1061 Elf_Sym sym;
1062 char *strp;
1063 unsigned long hash;
1064
1065 hash = elf_hash(name);
1066 COPYOUT(&ef->buckets[hash % ef->nbuckets], &symnum, sizeof (symnum));
1067
1068 while (symnum != STN_UNDEF) {
1069 if (symnum >= ef->nchains) {
1070 printf(__elfN(bad_symtable));
1071 return (ENOENT);
1072 }
1073
1074 COPYOUT(ef->symtab + symnum, &sym, sizeof (sym));
1075 if (sym.st_name == 0) {
1076 printf(__elfN(bad_symtable));
1077 return (ENOENT);
1078 }
1079
1080 strp = strdupout((vm_offset_t)(ef->strtab + sym.st_name));
1081 if (strcmp(name, strp) == 0) {
1082 free(strp);
1083 if (sym.st_shndx != SHN_UNDEF ||
1084 (sym.st_value != 0 &&
1085 ELF_ST_TYPE(sym.st_info) == STT_FUNC)) {
1086 *symp = sym;
1087 return (0);
1088 }
1089 return (ENOENT);
1090 }
1091 free(strp);
1092 COPYOUT(&ef->chains[symnum], &symnum, sizeof (symnum));
1093 }
1094 return (ENOENT);
1095 }
1096
1097 /*
1098 * Apply any intra-module relocations to the value. p is the load address
1099 * of the value and val/len is the value to be modified. This does NOT modify
1100 * the image in-place, because this is done by kern_linker later on.
1101 *
1102 * Returns EOPNOTSUPP if no relocation method is supplied.
1103 */
1104 static int
__elfN(reloc_ptr)1105 __elfN(reloc_ptr)(struct preloaded_file *mp __unused, elf_file_t ef,
1106 Elf_Addr p, void *val, size_t len)
1107 {
1108 size_t n;
1109 Elf_Rela a;
1110 Elf_Rel r;
1111 int error;
1112
1113 /*
1114 * The kernel is already relocated, but we still want to apply
1115 * offset adjustments.
1116 */
1117 if (ef->kernel)
1118 return (EOPNOTSUPP);
1119
1120 for (n = 0; n < ef->relsz / sizeof (r); n++) {
1121 COPYOUT(ef->rel + n, &r, sizeof (r));
1122
1123 error = __elfN(reloc)(ef, __elfN(symaddr), &r, ELF_RELOC_REL,
1124 ef->off, p, val, len);
1125 if (error != 0)
1126 return (error);
1127 }
1128 for (n = 0; n < ef->relasz / sizeof (a); n++) {
1129 COPYOUT(ef->rela + n, &a, sizeof (a));
1130
1131 error = __elfN(reloc)(ef, __elfN(symaddr), &a, ELF_RELOC_RELA,
1132 ef->off, p, val, len);
1133 if (error != 0)
1134 return (error);
1135 }
1136
1137 return (0);
1138 }
1139
1140 static Elf_Addr
__elfN(symaddr)1141 __elfN(symaddr)(struct elf_file *ef __unused, Elf_Size symidx __unused)
1142 {
1143 /* Symbol lookup by index not required here. */
1144 return (0);
1145 }
1146