FreeBSD/Linux Kernel Cross Reference
sys/kern/imgact_elf.c
1 /*-
2 * Copyright (c) 2000 David O'Brien
3 * Copyright (c) 1995-1996 Søren Schmidt
4 * Copyright (c) 1996 Peter Wemm
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer
12 * in this position and unchanged.
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 * 3. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD: releng/8.0/sys/kern/imgact_elf.c 198284 2009-10-20 13:34:41Z kib $");
33
34 #include "opt_compat.h"
35
36 #include <sys/param.h>
37 #include <sys/exec.h>
38 #include <sys/fcntl.h>
39 #include <sys/imgact.h>
40 #include <sys/imgact_elf.h>
41 #include <sys/kernel.h>
42 #include <sys/lock.h>
43 #include <sys/malloc.h>
44 #include <sys/mount.h>
45 #include <sys/mutex.h>
46 #include <sys/mman.h>
47 #include <sys/namei.h>
48 #include <sys/pioctl.h>
49 #include <sys/proc.h>
50 #include <sys/procfs.h>
51 #include <sys/resourcevar.h>
52 #include <sys/sf_buf.h>
53 #include <sys/systm.h>
54 #include <sys/signalvar.h>
55 #include <sys/stat.h>
56 #include <sys/sx.h>
57 #include <sys/syscall.h>
58 #include <sys/sysctl.h>
59 #include <sys/sysent.h>
60 #include <sys/vnode.h>
61
62 #include <vm/vm.h>
63 #include <vm/vm_kern.h>
64 #include <vm/vm_param.h>
65 #include <vm/pmap.h>
66 #include <vm/vm_map.h>
67 #include <vm/vm_object.h>
68 #include <vm/vm_extern.h>
69
70 #include <machine/elf.h>
71 #include <machine/md_var.h>
72
73 #if defined(COMPAT_IA32) && __ELF_WORD_SIZE == 32
74 #include <machine/fpu.h>
75 #include <compat/ia32/ia32_reg.h>
76 #endif
77
78 #define OLD_EI_BRAND 8
79
80 static int __elfN(check_header)(const Elf_Ehdr *hdr);
81 static Elf_Brandinfo *__elfN(get_brandinfo)(struct image_params *imgp,
82 const char *interp, int32_t *osrel);
83 static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
84 u_long *entry, size_t pagesize);
85 static int __elfN(load_section)(struct vmspace *vmspace, vm_object_t object,
86 vm_offset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz,
87 vm_prot_t prot, size_t pagesize);
88 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp);
89 static boolean_t __elfN(freebsd_trans_osrel)(const Elf_Note *note,
90 int32_t *osrel);
91 static boolean_t kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel);
92 static boolean_t __elfN(check_note)(struct image_params *imgp,
93 Elf_Brandnote *checknote, int32_t *osrel);
94
95 SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0,
96 "");
97
98 int __elfN(fallback_brand) = -1;
99 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
100 fallback_brand, CTLFLAG_RW, &__elfN(fallback_brand), 0,
101 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort");
102 TUNABLE_INT("kern.elf" __XSTRING(__ELF_WORD_SIZE) ".fallback_brand",
103 &__elfN(fallback_brand));
104
105 static int elf_legacy_coredump = 0;
106 SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW,
107 &elf_legacy_coredump, 0, "");
108
109 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS];
110
111 #define trunc_page_ps(va, ps) ((va) & ~(ps - 1))
112 #define round_page_ps(va, ps) (((va) + (ps - 1)) & ~(ps - 1))
113 #define aligned(a, t) (trunc_page_ps((u_long)(a), sizeof(t)) == (u_long)(a))
114
115 static const char FREEBSD_ABI_VENDOR[] = "FreeBSD";
116
117 Elf_Brandnote __elfN(freebsd_brandnote) = {
118 .hdr.n_namesz = sizeof(FREEBSD_ABI_VENDOR),
119 .hdr.n_descsz = sizeof(int32_t),
120 .hdr.n_type = 1,
121 .vendor = FREEBSD_ABI_VENDOR,
122 .flags = BN_TRANSLATE_OSREL,
123 .trans_osrel = __elfN(freebsd_trans_osrel)
124 };
125
126 static boolean_t
127 __elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel)
128 {
129 uintptr_t p;
130
131 p = (uintptr_t)(note + 1);
132 p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
133 *osrel = *(const int32_t *)(p);
134
135 return (TRUE);
136 }
137
138 static const char GNU_ABI_VENDOR[] = "GNU";
139 static int GNU_KFREEBSD_ABI_DESC = 3;
140
141 Elf_Brandnote __elfN(kfreebsd_brandnote) = {
142 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR),
143 .hdr.n_descsz = 16, /* XXX at least 16 */
144 .hdr.n_type = 1,
145 .vendor = GNU_ABI_VENDOR,
146 .flags = BN_TRANSLATE_OSREL,
147 .trans_osrel = kfreebsd_trans_osrel
148 };
149
150 static boolean_t
151 kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel)
152 {
153 const Elf32_Word *desc;
154 uintptr_t p;
155
156 p = (uintptr_t)(note + 1);
157 p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
158
159 desc = (const Elf32_Word *)p;
160 if (desc[0] != GNU_KFREEBSD_ABI_DESC)
161 return (FALSE);
162
163 /*
164 * Debian GNU/kFreeBSD embed the earliest compatible kernel version
165 * (__FreeBSD_version: <major><two digit minor>Rxx) in the LSB way.
166 */
167 *osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3];
168
169 return (TRUE);
170 }
171
172 int
173 __elfN(insert_brand_entry)(Elf_Brandinfo *entry)
174 {
175 int i;
176
177 for (i = 0; i < MAX_BRANDS; i++) {
178 if (elf_brand_list[i] == NULL) {
179 elf_brand_list[i] = entry;
180 break;
181 }
182 }
183 if (i == MAX_BRANDS)
184 return (-1);
185 return (0);
186 }
187
188 int
189 __elfN(remove_brand_entry)(Elf_Brandinfo *entry)
190 {
191 int i;
192
193 for (i = 0; i < MAX_BRANDS; i++) {
194 if (elf_brand_list[i] == entry) {
195 elf_brand_list[i] = NULL;
196 break;
197 }
198 }
199 if (i == MAX_BRANDS)
200 return (-1);
201 return (0);
202 }
203
204 int
205 __elfN(brand_inuse)(Elf_Brandinfo *entry)
206 {
207 struct proc *p;
208 int rval = FALSE;
209
210 sx_slock(&allproc_lock);
211 FOREACH_PROC_IN_SYSTEM(p) {
212 if (p->p_sysent == entry->sysvec) {
213 rval = TRUE;
214 break;
215 }
216 }
217 sx_sunlock(&allproc_lock);
218
219 return (rval);
220 }
221
222 static Elf_Brandinfo *
223 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp,
224 int32_t *osrel)
225 {
226 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
227 Elf_Brandinfo *bi;
228 boolean_t ret;
229 int i;
230
231 /*
232 * We support four types of branding -- (1) the ELF EI_OSABI field
233 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string
234 * branding w/in the ELF header, (3) path of the `interp_path'
235 * field, and (4) the ".note.ABI-tag" ELF section.
236 */
237
238 /* Look for an ".note.ABI-tag" ELF section */
239 for (i = 0; i < MAX_BRANDS; i++) {
240 bi = elf_brand_list[i];
241 if (bi == NULL)
242 continue;
243 if (hdr->e_machine == bi->machine && (bi->flags &
244 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) {
245 ret = __elfN(check_note)(imgp, bi->brand_note, osrel);
246 if (ret)
247 return (bi);
248 }
249 }
250
251 /* If the executable has a brand, search for it in the brand list. */
252 for (i = 0; i < MAX_BRANDS; i++) {
253 bi = elf_brand_list[i];
254 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
255 continue;
256 if (hdr->e_machine == bi->machine &&
257 (hdr->e_ident[EI_OSABI] == bi->brand ||
258 strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND],
259 bi->compat_3_brand, strlen(bi->compat_3_brand)) == 0))
260 return (bi);
261 }
262
263 /* Lacking a known brand, search for a recognized interpreter. */
264 if (interp != NULL) {
265 for (i = 0; i < MAX_BRANDS; i++) {
266 bi = elf_brand_list[i];
267 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
268 continue;
269 if (hdr->e_machine == bi->machine &&
270 strcmp(interp, bi->interp_path) == 0)
271 return (bi);
272 }
273 }
274
275 /* Lacking a recognized interpreter, try the default brand */
276 for (i = 0; i < MAX_BRANDS; i++) {
277 bi = elf_brand_list[i];
278 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
279 continue;
280 if (hdr->e_machine == bi->machine &&
281 __elfN(fallback_brand) == bi->brand)
282 return (bi);
283 }
284 return (NULL);
285 }
286
287 static int
288 __elfN(check_header)(const Elf_Ehdr *hdr)
289 {
290 Elf_Brandinfo *bi;
291 int i;
292
293 if (!IS_ELF(*hdr) ||
294 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
295 hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
296 hdr->e_ident[EI_VERSION] != EV_CURRENT ||
297 hdr->e_phentsize != sizeof(Elf_Phdr) ||
298 hdr->e_version != ELF_TARG_VER)
299 return (ENOEXEC);
300
301 /*
302 * Make sure we have at least one brand for this machine.
303 */
304
305 for (i = 0; i < MAX_BRANDS; i++) {
306 bi = elf_brand_list[i];
307 if (bi != NULL && bi->machine == hdr->e_machine)
308 break;
309 }
310 if (i == MAX_BRANDS)
311 return (ENOEXEC);
312
313 return (0);
314 }
315
316 static int
317 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
318 vm_offset_t start, vm_offset_t end, vm_prot_t prot)
319 {
320 struct sf_buf *sf;
321 int error;
322 vm_offset_t off;
323
324 /*
325 * Create the page if it doesn't exist yet. Ignore errors.
326 */
327 vm_map_lock(map);
328 vm_map_insert(map, NULL, 0, trunc_page(start), round_page(end),
329 VM_PROT_ALL, VM_PROT_ALL, 0);
330 vm_map_unlock(map);
331
332 /*
333 * Find the page from the underlying object.
334 */
335 if (object) {
336 sf = vm_imgact_map_page(object, offset);
337 if (sf == NULL)
338 return (KERN_FAILURE);
339 off = offset - trunc_page(offset);
340 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start,
341 end - start);
342 vm_imgact_unmap_page(sf);
343 if (error) {
344 return (KERN_FAILURE);
345 }
346 }
347
348 return (KERN_SUCCESS);
349 }
350
351 static int
352 __elfN(map_insert)(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
353 vm_offset_t start, vm_offset_t end, vm_prot_t prot, int cow)
354 {
355 struct sf_buf *sf;
356 vm_offset_t off;
357 vm_size_t sz;
358 int error, rv;
359
360 if (start != trunc_page(start)) {
361 rv = __elfN(map_partial)(map, object, offset, start,
362 round_page(start), prot);
363 if (rv)
364 return (rv);
365 offset += round_page(start) - start;
366 start = round_page(start);
367 }
368 if (end != round_page(end)) {
369 rv = __elfN(map_partial)(map, object, offset +
370 trunc_page(end) - start, trunc_page(end), end, prot);
371 if (rv)
372 return (rv);
373 end = trunc_page(end);
374 }
375 if (end > start) {
376 if (offset & PAGE_MASK) {
377 /*
378 * The mapping is not page aligned. This means we have
379 * to copy the data. Sigh.
380 */
381 rv = vm_map_find(map, NULL, 0, &start, end - start,
382 FALSE, prot | VM_PROT_WRITE, VM_PROT_ALL, 0);
383 if (rv)
384 return (rv);
385 if (object == NULL)
386 return (KERN_SUCCESS);
387 for (; start < end; start += sz) {
388 sf = vm_imgact_map_page(object, offset);
389 if (sf == NULL)
390 return (KERN_FAILURE);
391 off = offset - trunc_page(offset);
392 sz = end - start;
393 if (sz > PAGE_SIZE - off)
394 sz = PAGE_SIZE - off;
395 error = copyout((caddr_t)sf_buf_kva(sf) + off,
396 (caddr_t)start, sz);
397 vm_imgact_unmap_page(sf);
398 if (error) {
399 return (KERN_FAILURE);
400 }
401 offset += sz;
402 }
403 rv = KERN_SUCCESS;
404 } else {
405 vm_object_reference(object);
406 vm_map_lock(map);
407 rv = vm_map_insert(map, object, offset, start, end,
408 prot, VM_PROT_ALL, cow);
409 vm_map_unlock(map);
410 if (rv != KERN_SUCCESS)
411 vm_object_deallocate(object);
412 }
413 return (rv);
414 } else {
415 return (KERN_SUCCESS);
416 }
417 }
418
419 static int
420 __elfN(load_section)(struct vmspace *vmspace,
421 vm_object_t object, vm_offset_t offset,
422 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot,
423 size_t pagesize)
424 {
425 struct sf_buf *sf;
426 size_t map_len;
427 vm_offset_t map_addr;
428 int error, rv, cow;
429 size_t copy_len;
430 vm_offset_t file_addr;
431
432 /*
433 * It's necessary to fail if the filsz + offset taken from the
434 * header is greater than the actual file pager object's size.
435 * If we were to allow this, then the vm_map_find() below would
436 * walk right off the end of the file object and into the ether.
437 *
438 * While I'm here, might as well check for something else that
439 * is invalid: filsz cannot be greater than memsz.
440 */
441 if ((off_t)filsz + offset > object->un_pager.vnp.vnp_size ||
442 filsz > memsz) {
443 uprintf("elf_load_section: truncated ELF file\n");
444 return (ENOEXEC);
445 }
446
447 map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize);
448 file_addr = trunc_page_ps(offset, pagesize);
449
450 /*
451 * We have two choices. We can either clear the data in the last page
452 * of an oversized mapping, or we can start the anon mapping a page
453 * early and copy the initialized data into that first page. We
454 * choose the second..
455 */
456 if (memsz > filsz)
457 map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr;
458 else
459 map_len = round_page_ps(offset + filsz, pagesize) - file_addr;
460
461 if (map_len != 0) {
462 /* cow flags: don't dump readonly sections in core */
463 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT |
464 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP);
465
466 rv = __elfN(map_insert)(&vmspace->vm_map,
467 object,
468 file_addr, /* file offset */
469 map_addr, /* virtual start */
470 map_addr + map_len,/* virtual end */
471 prot,
472 cow);
473 if (rv != KERN_SUCCESS)
474 return (EINVAL);
475
476 /* we can stop now if we've covered it all */
477 if (memsz == filsz) {
478 return (0);
479 }
480 }
481
482
483 /*
484 * We have to get the remaining bit of the file into the first part
485 * of the oversized map segment. This is normally because the .data
486 * segment in the file is extended to provide bss. It's a neat idea
487 * to try and save a page, but it's a pain in the behind to implement.
488 */
489 copy_len = (offset + filsz) - trunc_page_ps(offset + filsz, pagesize);
490 map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize);
491 map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) -
492 map_addr;
493
494 /* This had damn well better be true! */
495 if (map_len != 0) {
496 rv = __elfN(map_insert)(&vmspace->vm_map, NULL, 0, map_addr,
497 map_addr + map_len, VM_PROT_ALL, 0);
498 if (rv != KERN_SUCCESS) {
499 return (EINVAL);
500 }
501 }
502
503 if (copy_len != 0) {
504 vm_offset_t off;
505
506 sf = vm_imgact_map_page(object, offset + filsz);
507 if (sf == NULL)
508 return (EIO);
509
510 /* send the page fragment to user space */
511 off = trunc_page_ps(offset + filsz, pagesize) -
512 trunc_page(offset + filsz);
513 error = copyout((caddr_t)sf_buf_kva(sf) + off,
514 (caddr_t)map_addr, copy_len);
515 vm_imgact_unmap_page(sf);
516 if (error) {
517 return (error);
518 }
519 }
520
521 /*
522 * set it to the specified protection.
523 * XXX had better undo the damage from pasting over the cracks here!
524 */
525 vm_map_protect(&vmspace->vm_map, trunc_page(map_addr),
526 round_page(map_addr + map_len), prot, FALSE);
527
528 return (0);
529 }
530
531 /*
532 * Load the file "file" into memory. It may be either a shared object
533 * or an executable.
534 *
535 * The "addr" reference parameter is in/out. On entry, it specifies
536 * the address where a shared object should be loaded. If the file is
537 * an executable, this value is ignored. On exit, "addr" specifies
538 * where the file was actually loaded.
539 *
540 * The "entry" reference parameter is out only. On exit, it specifies
541 * the entry point for the loaded file.
542 */
543 static int
544 __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
545 u_long *entry, size_t pagesize)
546 {
547 struct {
548 struct nameidata nd;
549 struct vattr attr;
550 struct image_params image_params;
551 } *tempdata;
552 const Elf_Ehdr *hdr = NULL;
553 const Elf_Phdr *phdr = NULL;
554 struct nameidata *nd;
555 struct vmspace *vmspace = p->p_vmspace;
556 struct vattr *attr;
557 struct image_params *imgp;
558 vm_prot_t prot;
559 u_long rbase;
560 u_long base_addr = 0;
561 int vfslocked, error, i, numsegs;
562
563 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK);
564 nd = &tempdata->nd;
565 attr = &tempdata->attr;
566 imgp = &tempdata->image_params;
567
568 /*
569 * Initialize part of the common data
570 */
571 imgp->proc = p;
572 imgp->attr = attr;
573 imgp->firstpage = NULL;
574 imgp->image_header = NULL;
575 imgp->object = NULL;
576 imgp->execlabel = NULL;
577
578 NDINIT(nd, LOOKUP, MPSAFE|LOCKLEAF|FOLLOW, UIO_SYSSPACE, file,
579 curthread);
580 vfslocked = 0;
581 if ((error = namei(nd)) != 0) {
582 nd->ni_vp = NULL;
583 goto fail;
584 }
585 vfslocked = NDHASGIANT(nd);
586 NDFREE(nd, NDF_ONLY_PNBUF);
587 imgp->vp = nd->ni_vp;
588
589 /*
590 * Check permissions, modes, uid, etc on the file, and "open" it.
591 */
592 error = exec_check_permissions(imgp);
593 if (error)
594 goto fail;
595
596 error = exec_map_first_page(imgp);
597 if (error)
598 goto fail;
599
600 /*
601 * Also make certain that the interpreter stays the same, so set
602 * its VV_TEXT flag, too.
603 */
604 nd->ni_vp->v_vflag |= VV_TEXT;
605
606 imgp->object = nd->ni_vp->v_object;
607
608 hdr = (const Elf_Ehdr *)imgp->image_header;
609 if ((error = __elfN(check_header)(hdr)) != 0)
610 goto fail;
611 if (hdr->e_type == ET_DYN)
612 rbase = *addr;
613 else if (hdr->e_type == ET_EXEC)
614 rbase = 0;
615 else {
616 error = ENOEXEC;
617 goto fail;
618 }
619
620 /* Only support headers that fit within first page for now */
621 /* (multiplication of two Elf_Half fields will not overflow) */
622 if ((hdr->e_phoff > PAGE_SIZE) ||
623 (hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE - hdr->e_phoff) {
624 error = ENOEXEC;
625 goto fail;
626 }
627
628 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
629 if (!aligned(phdr, Elf_Addr)) {
630 error = ENOEXEC;
631 goto fail;
632 }
633
634 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) {
635 if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) {
636 /* Loadable segment */
637 prot = 0;
638 if (phdr[i].p_flags & PF_X)
639 prot |= VM_PROT_EXECUTE;
640 if (phdr[i].p_flags & PF_W)
641 prot |= VM_PROT_WRITE;
642 if (phdr[i].p_flags & PF_R)
643 prot |= VM_PROT_READ;
644
645 if ((error = __elfN(load_section)(vmspace,
646 imgp->object, phdr[i].p_offset,
647 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase,
648 phdr[i].p_memsz, phdr[i].p_filesz, prot,
649 pagesize)) != 0)
650 goto fail;
651 /*
652 * Establish the base address if this is the
653 * first segment.
654 */
655 if (numsegs == 0)
656 base_addr = trunc_page(phdr[i].p_vaddr +
657 rbase);
658 numsegs++;
659 }
660 }
661 *addr = base_addr;
662 *entry = (unsigned long)hdr->e_entry + rbase;
663
664 fail:
665 if (imgp->firstpage)
666 exec_unmap_first_page(imgp);
667
668 if (nd->ni_vp)
669 vput(nd->ni_vp);
670
671 VFS_UNLOCK_GIANT(vfslocked);
672 free(tempdata, M_TEMP);
673
674 return (error);
675 }
676
677 static int
678 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp)
679 {
680 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
681 const Elf_Phdr *phdr;
682 Elf_Auxargs *elf_auxargs;
683 struct vmspace *vmspace;
684 vm_prot_t prot;
685 u_long text_size = 0, data_size = 0, total_size = 0;
686 u_long text_addr = 0, data_addr = 0;
687 u_long seg_size, seg_addr;
688 u_long addr, baddr, et_dyn_addr, entry = 0, proghdr = 0;
689 int32_t osrel = 0;
690 int error = 0, i, n;
691 const char *interp = NULL, *newinterp = NULL;
692 Elf_Brandinfo *brand_info;
693 char *path;
694 struct sysentvec *sv;
695
696 /*
697 * Do we have a valid ELF header ?
698 *
699 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later
700 * if particular brand doesn't support it.
701 */
702 if (__elfN(check_header)(hdr) != 0 ||
703 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN))
704 return (-1);
705
706 /*
707 * From here on down, we return an errno, not -1, as we've
708 * detected an ELF file.
709 */
710
711 if ((hdr->e_phoff > PAGE_SIZE) ||
712 (hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) {
713 /* Only support headers in first page for now */
714 return (ENOEXEC);
715 }
716 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
717 if (!aligned(phdr, Elf_Addr))
718 return (ENOEXEC);
719 n = 0;
720 baddr = 0;
721 for (i = 0; i < hdr->e_phnum; i++) {
722 if (phdr[i].p_type == PT_LOAD) {
723 if (n == 0)
724 baddr = phdr[i].p_vaddr;
725 n++;
726 continue;
727 }
728 if (phdr[i].p_type == PT_INTERP) {
729 /* Path to interpreter */
730 if (phdr[i].p_filesz > MAXPATHLEN ||
731 phdr[i].p_offset + phdr[i].p_filesz > PAGE_SIZE)
732 return (ENOEXEC);
733 interp = imgp->image_header + phdr[i].p_offset;
734 continue;
735 }
736 }
737
738 brand_info = __elfN(get_brandinfo)(imgp, interp, &osrel);
739 if (brand_info == NULL) {
740 uprintf("ELF binary type \"%u\" not known.\n",
741 hdr->e_ident[EI_OSABI]);
742 return (ENOEXEC);
743 }
744 if (hdr->e_type == ET_DYN) {
745 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0)
746 return (ENOEXEC);
747 /*
748 * Honour the base load address from the dso if it is
749 * non-zero for some reason.
750 */
751 if (baddr == 0)
752 et_dyn_addr = ET_DYN_LOAD_ADDR;
753 else
754 et_dyn_addr = 0;
755 } else
756 et_dyn_addr = 0;
757 sv = brand_info->sysvec;
758 if (interp != NULL && brand_info->interp_newpath != NULL)
759 newinterp = brand_info->interp_newpath;
760
761 /*
762 * Avoid a possible deadlock if the current address space is destroyed
763 * and that address space maps the locked vnode. In the common case,
764 * the locked vnode's v_usecount is decremented but remains greater
765 * than zero. Consequently, the vnode lock is not needed by vrele().
766 * However, in cases where the vnode lock is external, such as nullfs,
767 * v_usecount may become zero.
768 */
769 VOP_UNLOCK(imgp->vp, 0);
770
771 error = exec_new_vmspace(imgp, sv);
772 imgp->proc->p_sysent = sv;
773
774 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
775 if (error)
776 return (error);
777
778 vmspace = imgp->proc->p_vmspace;
779
780 for (i = 0; i < hdr->e_phnum; i++) {
781 switch (phdr[i].p_type) {
782 case PT_LOAD: /* Loadable segment */
783 if (phdr[i].p_memsz == 0)
784 break;
785 prot = 0;
786 if (phdr[i].p_flags & PF_X)
787 prot |= VM_PROT_EXECUTE;
788 if (phdr[i].p_flags & PF_W)
789 prot |= VM_PROT_WRITE;
790 if (phdr[i].p_flags & PF_R)
791 prot |= VM_PROT_READ;
792
793 #if defined(__ia64__) && __ELF_WORD_SIZE == 32 && defined(IA32_ME_HARDER)
794 /*
795 * Some x86 binaries assume read == executable,
796 * notably the M3 runtime and therefore cvsup
797 */
798 if (prot & VM_PROT_READ)
799 prot |= VM_PROT_EXECUTE;
800 #endif
801
802 if ((error = __elfN(load_section)(vmspace,
803 imgp->object, phdr[i].p_offset,
804 (caddr_t)(uintptr_t)phdr[i].p_vaddr + et_dyn_addr,
805 phdr[i].p_memsz, phdr[i].p_filesz, prot,
806 sv->sv_pagesize)) != 0)
807 return (error);
808
809 /*
810 * If this segment contains the program headers,
811 * remember their virtual address for the AT_PHDR
812 * aux entry. Static binaries don't usually include
813 * a PT_PHDR entry.
814 */
815 if (phdr[i].p_offset == 0 &&
816 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize
817 <= phdr[i].p_filesz)
818 proghdr = phdr[i].p_vaddr + hdr->e_phoff +
819 et_dyn_addr;
820
821 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr);
822 seg_size = round_page(phdr[i].p_memsz +
823 phdr[i].p_vaddr + et_dyn_addr - seg_addr);
824
825 /*
826 * Is this .text or .data? We can't use
827 * VM_PROT_WRITE or VM_PROT_EXEC, it breaks the
828 * alpha terribly and possibly does other bad
829 * things so we stick to the old way of figuring
830 * it out: If the segment contains the program
831 * entry point, it's a text segment, otherwise it
832 * is a data segment.
833 *
834 * Note that obreak() assumes that data_addr +
835 * data_size == end of data load area, and the ELF
836 * file format expects segments to be sorted by
837 * address. If multiple data segments exist, the
838 * last one will be used.
839 */
840 if (hdr->e_entry >= phdr[i].p_vaddr &&
841 hdr->e_entry < (phdr[i].p_vaddr +
842 phdr[i].p_memsz)) {
843 text_size = seg_size;
844 text_addr = seg_addr;
845 entry = (u_long)hdr->e_entry + et_dyn_addr;
846 } else {
847 data_size = seg_size;
848 data_addr = seg_addr;
849 }
850 total_size += seg_size;
851 break;
852 case PT_PHDR: /* Program header table info */
853 proghdr = phdr[i].p_vaddr + et_dyn_addr;
854 break;
855 default:
856 break;
857 }
858 }
859
860 if (data_addr == 0 && data_size == 0) {
861 data_addr = text_addr;
862 data_size = text_size;
863 }
864
865 /*
866 * Check limits. It should be safe to check the
867 * limits after loading the segments since we do
868 * not actually fault in all the segments pages.
869 */
870 PROC_LOCK(imgp->proc);
871 if (data_size > lim_cur(imgp->proc, RLIMIT_DATA) ||
872 text_size > maxtsiz ||
873 total_size > lim_cur(imgp->proc, RLIMIT_VMEM)) {
874 PROC_UNLOCK(imgp->proc);
875 return (ENOMEM);
876 }
877
878 vmspace->vm_tsize = text_size >> PAGE_SHIFT;
879 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr;
880 vmspace->vm_dsize = data_size >> PAGE_SHIFT;
881 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr;
882
883 /*
884 * We load the dynamic linker where a userland call
885 * to mmap(0, ...) would put it. The rationale behind this
886 * calculation is that it leaves room for the heap to grow to
887 * its maximum allowed size.
888 */
889 addr = round_page((vm_offset_t)imgp->proc->p_vmspace->vm_daddr +
890 lim_max(imgp->proc, RLIMIT_DATA));
891 PROC_UNLOCK(imgp->proc);
892
893 imgp->entry_addr = entry;
894
895 if (interp != NULL) {
896 int have_interp = FALSE;
897 VOP_UNLOCK(imgp->vp, 0);
898 if (brand_info->emul_path != NULL &&
899 brand_info->emul_path[0] != '\0') {
900 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
901 snprintf(path, MAXPATHLEN, "%s%s",
902 brand_info->emul_path, interp);
903 error = __elfN(load_file)(imgp->proc, path, &addr,
904 &imgp->entry_addr, sv->sv_pagesize);
905 free(path, M_TEMP);
906 if (error == 0)
907 have_interp = TRUE;
908 }
909 if (!have_interp && newinterp != NULL) {
910 error = __elfN(load_file)(imgp->proc, newinterp, &addr,
911 &imgp->entry_addr, sv->sv_pagesize);
912 if (error == 0)
913 have_interp = TRUE;
914 }
915 if (!have_interp) {
916 error = __elfN(load_file)(imgp->proc, interp, &addr,
917 &imgp->entry_addr, sv->sv_pagesize);
918 }
919 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
920 if (error != 0) {
921 uprintf("ELF interpreter %s not found\n", interp);
922 return (error);
923 }
924 } else
925 addr = et_dyn_addr;
926
927 /*
928 * Construct auxargs table (used by the fixup routine)
929 */
930 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK);
931 elf_auxargs->execfd = -1;
932 elf_auxargs->phdr = proghdr;
933 elf_auxargs->phent = hdr->e_phentsize;
934 elf_auxargs->phnum = hdr->e_phnum;
935 elf_auxargs->pagesz = PAGE_SIZE;
936 elf_auxargs->base = addr;
937 elf_auxargs->flags = 0;
938 elf_auxargs->entry = entry;
939
940 imgp->auxargs = elf_auxargs;
941 imgp->interpreted = 0;
942 imgp->proc->p_osrel = osrel;
943
944 return (error);
945 }
946
947 #define suword __CONCAT(suword, __ELF_WORD_SIZE)
948
949 int
950 __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp)
951 {
952 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs;
953 Elf_Addr *base;
954 Elf_Addr *pos;
955
956 base = (Elf_Addr *)*stack_base;
957 pos = base + (imgp->args->argc + imgp->args->envc + 2);
958
959 if (args->execfd != -1)
960 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
961 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
962 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
963 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
964 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
965 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
966 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
967 AUXARGS_ENTRY(pos, AT_BASE, args->base);
968 if (imgp->execpathp != 0)
969 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp);
970 AUXARGS_ENTRY(pos, AT_NULL, 0);
971
972 free(imgp->auxargs, M_TEMP);
973 imgp->auxargs = NULL;
974
975 base--;
976 suword(base, (long)imgp->args->argc);
977 *stack_base = (register_t *)base;
978 return (0);
979 }
980
981 /*
982 * Code for generating ELF core dumps.
983 */
984
985 typedef void (*segment_callback)(vm_map_entry_t, void *);
986
987 /* Closure for cb_put_phdr(). */
988 struct phdr_closure {
989 Elf_Phdr *phdr; /* Program header to fill in */
990 Elf_Off offset; /* Offset of segment in core file */
991 };
992
993 /* Closure for cb_size_segment(). */
994 struct sseg_closure {
995 int count; /* Count of writable segments. */
996 size_t size; /* Total size of all writable segments. */
997 };
998
999 static void cb_put_phdr(vm_map_entry_t, void *);
1000 static void cb_size_segment(vm_map_entry_t, void *);
1001 static void each_writable_segment(struct thread *, segment_callback, void *);
1002 static int __elfN(corehdr)(struct thread *, struct vnode *, struct ucred *,
1003 int, void *, size_t);
1004 static void __elfN(puthdr)(struct thread *, void *, size_t *, int);
1005 static void __elfN(putnote)(void *, size_t *, const char *, int,
1006 const void *, size_t);
1007
1008 int
1009 __elfN(coredump)(td, vp, limit)
1010 struct thread *td;
1011 struct vnode *vp;
1012 off_t limit;
1013 {
1014 struct ucred *cred = td->td_ucred;
1015 int error = 0;
1016 struct sseg_closure seginfo;
1017 void *hdr;
1018 size_t hdrsize;
1019
1020 /* Size the program segments. */
1021 seginfo.count = 0;
1022 seginfo.size = 0;
1023 each_writable_segment(td, cb_size_segment, &seginfo);
1024
1025 /*
1026 * Calculate the size of the core file header area by making
1027 * a dry run of generating it. Nothing is written, but the
1028 * size is calculated.
1029 */
1030 hdrsize = 0;
1031 __elfN(puthdr)(td, (void *)NULL, &hdrsize, seginfo.count);
1032
1033 if (hdrsize + seginfo.size >= limit)
1034 return (EFAULT);
1035
1036 /*
1037 * Allocate memory for building the header, fill it up,
1038 * and write it out.
1039 */
1040 hdr = malloc(hdrsize, M_TEMP, M_WAITOK);
1041 if (hdr == NULL) {
1042 return (EINVAL);
1043 }
1044 error = __elfN(corehdr)(td, vp, cred, seginfo.count, hdr, hdrsize);
1045
1046 /* Write the contents of all of the writable segments. */
1047 if (error == 0) {
1048 Elf_Phdr *php;
1049 off_t offset;
1050 int i;
1051
1052 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1;
1053 offset = hdrsize;
1054 for (i = 0; i < seginfo.count; i++) {
1055 error = vn_rdwr_inchunks(UIO_WRITE, vp,
1056 (caddr_t)(uintptr_t)php->p_vaddr,
1057 php->p_filesz, offset, UIO_USERSPACE,
1058 IO_UNIT | IO_DIRECT, cred, NOCRED, NULL,
1059 curthread);
1060 if (error != 0)
1061 break;
1062 offset += php->p_filesz;
1063 php++;
1064 }
1065 }
1066 free(hdr, M_TEMP);
1067
1068 return (error);
1069 }
1070
1071 /*
1072 * A callback for each_writable_segment() to write out the segment's
1073 * program header entry.
1074 */
1075 static void
1076 cb_put_phdr(entry, closure)
1077 vm_map_entry_t entry;
1078 void *closure;
1079 {
1080 struct phdr_closure *phc = (struct phdr_closure *)closure;
1081 Elf_Phdr *phdr = phc->phdr;
1082
1083 phc->offset = round_page(phc->offset);
1084
1085 phdr->p_type = PT_LOAD;
1086 phdr->p_offset = phc->offset;
1087 phdr->p_vaddr = entry->start;
1088 phdr->p_paddr = 0;
1089 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
1090 phdr->p_align = PAGE_SIZE;
1091 phdr->p_flags = 0;
1092 if (entry->protection & VM_PROT_READ)
1093 phdr->p_flags |= PF_R;
1094 if (entry->protection & VM_PROT_WRITE)
1095 phdr->p_flags |= PF_W;
1096 if (entry->protection & VM_PROT_EXECUTE)
1097 phdr->p_flags |= PF_X;
1098
1099 phc->offset += phdr->p_filesz;
1100 phc->phdr++;
1101 }
1102
1103 /*
1104 * A callback for each_writable_segment() to gather information about
1105 * the number of segments and their total size.
1106 */
1107 static void
1108 cb_size_segment(entry, closure)
1109 vm_map_entry_t entry;
1110 void *closure;
1111 {
1112 struct sseg_closure *ssc = (struct sseg_closure *)closure;
1113
1114 ssc->count++;
1115 ssc->size += entry->end - entry->start;
1116 }
1117
1118 /*
1119 * For each writable segment in the process's memory map, call the given
1120 * function with a pointer to the map entry and some arbitrary
1121 * caller-supplied data.
1122 */
1123 static void
1124 each_writable_segment(td, func, closure)
1125 struct thread *td;
1126 segment_callback func;
1127 void *closure;
1128 {
1129 struct proc *p = td->td_proc;
1130 vm_map_t map = &p->p_vmspace->vm_map;
1131 vm_map_entry_t entry;
1132 vm_object_t backing_object, object;
1133 boolean_t ignore_entry;
1134
1135 vm_map_lock_read(map);
1136 for (entry = map->header.next; entry != &map->header;
1137 entry = entry->next) {
1138 /*
1139 * Don't dump inaccessible mappings, deal with legacy
1140 * coredump mode.
1141 *
1142 * Note that read-only segments related to the elf binary
1143 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer
1144 * need to arbitrarily ignore such segments.
1145 */
1146 if (elf_legacy_coredump) {
1147 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW)
1148 continue;
1149 } else {
1150 if ((entry->protection & VM_PROT_ALL) == 0)
1151 continue;
1152 }
1153
1154 /*
1155 * Dont include memory segment in the coredump if
1156 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in
1157 * madvise(2). Do not dump submaps (i.e. parts of the
1158 * kernel map).
1159 */
1160 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP))
1161 continue;
1162
1163 if ((object = entry->object.vm_object) == NULL)
1164 continue;
1165
1166 /* Ignore memory-mapped devices and such things. */
1167 VM_OBJECT_LOCK(object);
1168 while ((backing_object = object->backing_object) != NULL) {
1169 VM_OBJECT_LOCK(backing_object);
1170 VM_OBJECT_UNLOCK(object);
1171 object = backing_object;
1172 }
1173 ignore_entry = object->type != OBJT_DEFAULT &&
1174 object->type != OBJT_SWAP && object->type != OBJT_VNODE;
1175 VM_OBJECT_UNLOCK(object);
1176 if (ignore_entry)
1177 continue;
1178
1179 (*func)(entry, closure);
1180 }
1181 vm_map_unlock_read(map);
1182 }
1183
1184 /*
1185 * Write the core file header to the file, including padding up to
1186 * the page boundary.
1187 */
1188 static int
1189 __elfN(corehdr)(td, vp, cred, numsegs, hdr, hdrsize)
1190 struct thread *td;
1191 struct vnode *vp;
1192 struct ucred *cred;
1193 int numsegs;
1194 size_t hdrsize;
1195 void *hdr;
1196 {
1197 size_t off;
1198
1199 /* Fill in the header. */
1200 bzero(hdr, hdrsize);
1201 off = 0;
1202 __elfN(puthdr)(td, hdr, &off, numsegs);
1203
1204 /* Write it to the core file. */
1205 return (vn_rdwr_inchunks(UIO_WRITE, vp, hdr, hdrsize, (off_t)0,
1206 UIO_SYSSPACE, IO_UNIT | IO_DIRECT, cred, NOCRED, NULL,
1207 td));
1208 }
1209
1210 #if defined(COMPAT_IA32) && __ELF_WORD_SIZE == 32
1211 typedef struct prstatus32 elf_prstatus_t;
1212 typedef struct prpsinfo32 elf_prpsinfo_t;
1213 typedef struct fpreg32 elf_prfpregset_t;
1214 typedef struct fpreg32 elf_fpregset_t;
1215 typedef struct reg32 elf_gregset_t;
1216 #else
1217 typedef prstatus_t elf_prstatus_t;
1218 typedef prpsinfo_t elf_prpsinfo_t;
1219 typedef prfpregset_t elf_prfpregset_t;
1220 typedef prfpregset_t elf_fpregset_t;
1221 typedef gregset_t elf_gregset_t;
1222 #endif
1223
1224 static void
1225 __elfN(puthdr)(struct thread *td, void *dst, size_t *off, int numsegs)
1226 {
1227 struct {
1228 elf_prstatus_t status;
1229 elf_prfpregset_t fpregset;
1230 elf_prpsinfo_t psinfo;
1231 } *tempdata;
1232 elf_prstatus_t *status;
1233 elf_prfpregset_t *fpregset;
1234 elf_prpsinfo_t *psinfo;
1235 struct proc *p;
1236 struct thread *thr;
1237 size_t ehoff, noteoff, notesz, phoff;
1238
1239 p = td->td_proc;
1240
1241 ehoff = *off;
1242 *off += sizeof(Elf_Ehdr);
1243
1244 phoff = *off;
1245 *off += (numsegs + 1) * sizeof(Elf_Phdr);
1246
1247 noteoff = *off;
1248 /*
1249 * Don't allocate space for the notes if we're just calculating
1250 * the size of the header. We also don't collect the data.
1251 */
1252 if (dst != NULL) {
1253 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_ZERO|M_WAITOK);
1254 status = &tempdata->status;
1255 fpregset = &tempdata->fpregset;
1256 psinfo = &tempdata->psinfo;
1257 } else {
1258 tempdata = NULL;
1259 status = NULL;
1260 fpregset = NULL;
1261 psinfo = NULL;
1262 }
1263
1264 if (dst != NULL) {
1265 psinfo->pr_version = PRPSINFO_VERSION;
1266 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t);
1267 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname));
1268 /*
1269 * XXX - We don't fill in the command line arguments properly
1270 * yet.
1271 */
1272 strlcpy(psinfo->pr_psargs, p->p_comm,
1273 sizeof(psinfo->pr_psargs));
1274 }
1275 __elfN(putnote)(dst, off, "FreeBSD", NT_PRPSINFO, psinfo,
1276 sizeof *psinfo);
1277
1278 /*
1279 * To have the debugger select the right thread (LWP) as the initial
1280 * thread, we dump the state of the thread passed to us in td first.
1281 * This is the thread that causes the core dump and thus likely to
1282 * be the right thread one wants to have selected in the debugger.
1283 */
1284 thr = td;
1285 while (thr != NULL) {
1286 if (dst != NULL) {
1287 status->pr_version = PRSTATUS_VERSION;
1288 status->pr_statussz = sizeof(elf_prstatus_t);
1289 status->pr_gregsetsz = sizeof(elf_gregset_t);
1290 status->pr_fpregsetsz = sizeof(elf_fpregset_t);
1291 status->pr_osreldate = osreldate;
1292 status->pr_cursig = p->p_sig;
1293 status->pr_pid = thr->td_tid;
1294 #if defined(COMPAT_IA32) && __ELF_WORD_SIZE == 32
1295 fill_regs32(thr, &status->pr_reg);
1296 fill_fpregs32(thr, fpregset);
1297 #else
1298 fill_regs(thr, &status->pr_reg);
1299 fill_fpregs(thr, fpregset);
1300 #endif
1301 }
1302 __elfN(putnote)(dst, off, "FreeBSD", NT_PRSTATUS, status,
1303 sizeof *status);
1304 __elfN(putnote)(dst, off, "FreeBSD", NT_FPREGSET, fpregset,
1305 sizeof *fpregset);
1306 /*
1307 * Allow for MD specific notes, as well as any MD
1308 * specific preparations for writing MI notes.
1309 */
1310 __elfN(dump_thread)(thr, dst, off);
1311
1312 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) :
1313 TAILQ_NEXT(thr, td_plist);
1314 if (thr == td)
1315 thr = TAILQ_NEXT(thr, td_plist);
1316 }
1317
1318 notesz = *off - noteoff;
1319
1320 if (dst != NULL)
1321 free(tempdata, M_TEMP);
1322
1323 /* Align up to a page boundary for the program segments. */
1324 *off = round_page(*off);
1325
1326 if (dst != NULL) {
1327 Elf_Ehdr *ehdr;
1328 Elf_Phdr *phdr;
1329 struct phdr_closure phc;
1330
1331 /*
1332 * Fill in the ELF header.
1333 */
1334 ehdr = (Elf_Ehdr *)((char *)dst + ehoff);
1335 ehdr->e_ident[EI_MAG0] = ELFMAG0;
1336 ehdr->e_ident[EI_MAG1] = ELFMAG1;
1337 ehdr->e_ident[EI_MAG2] = ELFMAG2;
1338 ehdr->e_ident[EI_MAG3] = ELFMAG3;
1339 ehdr->e_ident[EI_CLASS] = ELF_CLASS;
1340 ehdr->e_ident[EI_DATA] = ELF_DATA;
1341 ehdr->e_ident[EI_VERSION] = EV_CURRENT;
1342 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
1343 ehdr->e_ident[EI_ABIVERSION] = 0;
1344 ehdr->e_ident[EI_PAD] = 0;
1345 ehdr->e_type = ET_CORE;
1346 #if defined(COMPAT_IA32) && __ELF_WORD_SIZE == 32
1347 ehdr->e_machine = EM_386;
1348 #else
1349 ehdr->e_machine = ELF_ARCH;
1350 #endif
1351 ehdr->e_version = EV_CURRENT;
1352 ehdr->e_entry = 0;
1353 ehdr->e_phoff = phoff;
1354 ehdr->e_flags = 0;
1355 ehdr->e_ehsize = sizeof(Elf_Ehdr);
1356 ehdr->e_phentsize = sizeof(Elf_Phdr);
1357 ehdr->e_phnum = numsegs + 1;
1358 ehdr->e_shentsize = sizeof(Elf_Shdr);
1359 ehdr->e_shnum = 0;
1360 ehdr->e_shstrndx = SHN_UNDEF;
1361
1362 /*
1363 * Fill in the program header entries.
1364 */
1365 phdr = (Elf_Phdr *)((char *)dst + phoff);
1366
1367 /* The note segement. */
1368 phdr->p_type = PT_NOTE;
1369 phdr->p_offset = noteoff;
1370 phdr->p_vaddr = 0;
1371 phdr->p_paddr = 0;
1372 phdr->p_filesz = notesz;
1373 phdr->p_memsz = 0;
1374 phdr->p_flags = 0;
1375 phdr->p_align = 0;
1376 phdr++;
1377
1378 /* All the writable segments from the program. */
1379 phc.phdr = phdr;
1380 phc.offset = *off;
1381 each_writable_segment(td, cb_put_phdr, &phc);
1382 }
1383 }
1384
1385 static void
1386 __elfN(putnote)(void *dst, size_t *off, const char *name, int type,
1387 const void *desc, size_t descsz)
1388 {
1389 Elf_Note note;
1390
1391 note.n_namesz = strlen(name) + 1;
1392 note.n_descsz = descsz;
1393 note.n_type = type;
1394 if (dst != NULL)
1395 bcopy(¬e, (char *)dst + *off, sizeof note);
1396 *off += sizeof note;
1397 if (dst != NULL)
1398 bcopy(name, (char *)dst + *off, note.n_namesz);
1399 *off += roundup2(note.n_namesz, sizeof(Elf_Size));
1400 if (dst != NULL)
1401 bcopy(desc, (char *)dst + *off, note.n_descsz);
1402 *off += roundup2(note.n_descsz, sizeof(Elf_Size));
1403 }
1404
1405 /*
1406 * Try to find the appropriate ABI-note section for checknote,
1407 * fetch the osreldate for binary from the ELF OSABI-note. Only the
1408 * first page of the image is searched, the same as for headers.
1409 */
1410 static boolean_t
1411 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote,
1412 int32_t *osrel)
1413 {
1414 const Elf_Note *note, *note0, *note_end;
1415 const Elf_Phdr *phdr, *pnote;
1416 const Elf_Ehdr *hdr;
1417 const char *note_name;
1418 int i;
1419
1420 pnote = NULL;
1421 hdr = (const Elf_Ehdr *)imgp->image_header;
1422 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
1423
1424 for (i = 0; i < hdr->e_phnum; i++) {
1425 if (phdr[i].p_type == PT_NOTE) {
1426 pnote = &phdr[i];
1427 break;
1428 }
1429 }
1430
1431 if (pnote == NULL || pnote->p_offset >= PAGE_SIZE ||
1432 pnote->p_offset + pnote->p_filesz >= PAGE_SIZE)
1433 return (FALSE);
1434
1435 note = note0 = (const Elf_Note *)(imgp->image_header + pnote->p_offset);
1436 note_end = (const Elf_Note *)(imgp->image_header +
1437 pnote->p_offset + pnote->p_filesz);
1438 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) {
1439 if (!aligned(note, Elf32_Addr))
1440 return (FALSE);
1441 if (note->n_namesz != checknote->hdr.n_namesz ||
1442 note->n_descsz != checknote->hdr.n_descsz ||
1443 note->n_type != checknote->hdr.n_type)
1444 goto nextnote;
1445 note_name = (const char *)(note + 1);
1446 if (strncmp(checknote->vendor, note_name,
1447 checknote->hdr.n_namesz) != 0)
1448 goto nextnote;
1449
1450 /*
1451 * Fetch the osreldate for binary
1452 * from the ELF OSABI-note if necessary.
1453 */
1454 if ((checknote->flags & BN_TRANSLATE_OSREL) != 0 &&
1455 checknote->trans_osrel != NULL)
1456 return (checknote->trans_osrel(note, osrel));
1457 return (TRUE);
1458
1459 nextnote:
1460 note = (const Elf_Note *)((const char *)(note + 1) +
1461 roundup2(note->n_namesz, sizeof(Elf32_Addr)) +
1462 roundup2(note->n_descsz, sizeof(Elf32_Addr)));
1463 }
1464
1465 return (FALSE);
1466 }
1467
1468 /*
1469 * Tell kern_execve.c about it, with a little help from the linker.
1470 */
1471 static struct execsw __elfN(execsw) = {
1472 __CONCAT(exec_, __elfN(imgact)),
1473 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
1474 };
1475 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw));
Cache object: 8884c6abbd93c994cac2859182ccf565
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