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: head/sys/kern/imgact_elf.c 198202 2009-10-18 12:57:48Z 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 printf("WARNING: %s: could not insert brandinfo entry: %p\n",
185 __func__, entry);
186 return (-1);
187 }
188 return (0);
189 }
190
191 int
192 __elfN(remove_brand_entry)(Elf_Brandinfo *entry)
193 {
194 int i;
195
196 for (i = 0; i < MAX_BRANDS; i++) {
197 if (elf_brand_list[i] == entry) {
198 elf_brand_list[i] = NULL;
199 break;
200 }
201 }
202 if (i == MAX_BRANDS)
203 return (-1);
204 return (0);
205 }
206
207 int
208 __elfN(brand_inuse)(Elf_Brandinfo *entry)
209 {
210 struct proc *p;
211 int rval = FALSE;
212
213 sx_slock(&allproc_lock);
214 FOREACH_PROC_IN_SYSTEM(p) {
215 if (p->p_sysent == entry->sysvec) {
216 rval = TRUE;
217 break;
218 }
219 }
220 sx_sunlock(&allproc_lock);
221
222 return (rval);
223 }
224
225 static Elf_Brandinfo *
226 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp,
227 int32_t *osrel)
228 {
229 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
230 Elf_Brandinfo *bi;
231 boolean_t ret;
232 int i;
233
234 /*
235 * We support four types of branding -- (1) the ELF EI_OSABI field
236 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string
237 * branding w/in the ELF header, (3) path of the `interp_path'
238 * field, and (4) the ".note.ABI-tag" ELF section.
239 */
240
241 /* Look for an ".note.ABI-tag" ELF section */
242 for (i = 0; i < MAX_BRANDS; i++) {
243 bi = elf_brand_list[i];
244 if (bi == NULL)
245 continue;
246 if (hdr->e_machine == bi->machine && (bi->flags &
247 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) {
248 ret = __elfN(check_note)(imgp, bi->brand_note, osrel);
249 if (ret)
250 return (bi);
251 }
252 }
253
254 /* If the executable has a brand, search for it in the brand list. */
255 for (i = 0; i < MAX_BRANDS; i++) {
256 bi = elf_brand_list[i];
257 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
258 continue;
259 if (hdr->e_machine == bi->machine &&
260 (hdr->e_ident[EI_OSABI] == bi->brand ||
261 strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND],
262 bi->compat_3_brand, strlen(bi->compat_3_brand)) == 0))
263 return (bi);
264 }
265
266 /* Lacking a known brand, search for a recognized interpreter. */
267 if (interp != NULL) {
268 for (i = 0; i < MAX_BRANDS; i++) {
269 bi = elf_brand_list[i];
270 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
271 continue;
272 if (hdr->e_machine == bi->machine &&
273 strcmp(interp, bi->interp_path) == 0)
274 return (bi);
275 }
276 }
277
278 /* Lacking a recognized interpreter, try the default brand */
279 for (i = 0; i < MAX_BRANDS; i++) {
280 bi = elf_brand_list[i];
281 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
282 continue;
283 if (hdr->e_machine == bi->machine &&
284 __elfN(fallback_brand) == bi->brand)
285 return (bi);
286 }
287 return (NULL);
288 }
289
290 static int
291 __elfN(check_header)(const Elf_Ehdr *hdr)
292 {
293 Elf_Brandinfo *bi;
294 int i;
295
296 if (!IS_ELF(*hdr) ||
297 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
298 hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
299 hdr->e_ident[EI_VERSION] != EV_CURRENT ||
300 hdr->e_phentsize != sizeof(Elf_Phdr) ||
301 hdr->e_version != ELF_TARG_VER)
302 return (ENOEXEC);
303
304 /*
305 * Make sure we have at least one brand for this machine.
306 */
307
308 for (i = 0; i < MAX_BRANDS; i++) {
309 bi = elf_brand_list[i];
310 if (bi != NULL && bi->machine == hdr->e_machine)
311 break;
312 }
313 if (i == MAX_BRANDS)
314 return (ENOEXEC);
315
316 return (0);
317 }
318
319 static int
320 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
321 vm_offset_t start, vm_offset_t end, vm_prot_t prot)
322 {
323 struct sf_buf *sf;
324 int error;
325 vm_offset_t off;
326
327 /*
328 * Create the page if it doesn't exist yet. Ignore errors.
329 */
330 vm_map_lock(map);
331 vm_map_insert(map, NULL, 0, trunc_page(start), round_page(end),
332 VM_PROT_ALL, VM_PROT_ALL, 0);
333 vm_map_unlock(map);
334
335 /*
336 * Find the page from the underlying object.
337 */
338 if (object) {
339 sf = vm_imgact_map_page(object, offset);
340 if (sf == NULL)
341 return (KERN_FAILURE);
342 off = offset - trunc_page(offset);
343 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start,
344 end - start);
345 vm_imgact_unmap_page(sf);
346 if (error) {
347 return (KERN_FAILURE);
348 }
349 }
350
351 return (KERN_SUCCESS);
352 }
353
354 static int
355 __elfN(map_insert)(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
356 vm_offset_t start, vm_offset_t end, vm_prot_t prot, int cow)
357 {
358 struct sf_buf *sf;
359 vm_offset_t off;
360 vm_size_t sz;
361 int error, rv;
362
363 if (start != trunc_page(start)) {
364 rv = __elfN(map_partial)(map, object, offset, start,
365 round_page(start), prot);
366 if (rv)
367 return (rv);
368 offset += round_page(start) - start;
369 start = round_page(start);
370 }
371 if (end != round_page(end)) {
372 rv = __elfN(map_partial)(map, object, offset +
373 trunc_page(end) - start, trunc_page(end), end, prot);
374 if (rv)
375 return (rv);
376 end = trunc_page(end);
377 }
378 if (end > start) {
379 if (offset & PAGE_MASK) {
380 /*
381 * The mapping is not page aligned. This means we have
382 * to copy the data. Sigh.
383 */
384 rv = vm_map_find(map, NULL, 0, &start, end - start,
385 FALSE, prot | VM_PROT_WRITE, VM_PROT_ALL, 0);
386 if (rv)
387 return (rv);
388 if (object == NULL)
389 return (KERN_SUCCESS);
390 for (; start < end; start += sz) {
391 sf = vm_imgact_map_page(object, offset);
392 if (sf == NULL)
393 return (KERN_FAILURE);
394 off = offset - trunc_page(offset);
395 sz = end - start;
396 if (sz > PAGE_SIZE - off)
397 sz = PAGE_SIZE - off;
398 error = copyout((caddr_t)sf_buf_kva(sf) + off,
399 (caddr_t)start, sz);
400 vm_imgact_unmap_page(sf);
401 if (error) {
402 return (KERN_FAILURE);
403 }
404 offset += sz;
405 }
406 rv = KERN_SUCCESS;
407 } else {
408 vm_object_reference(object);
409 vm_map_lock(map);
410 rv = vm_map_insert(map, object, offset, start, end,
411 prot, VM_PROT_ALL, cow);
412 vm_map_unlock(map);
413 if (rv != KERN_SUCCESS)
414 vm_object_deallocate(object);
415 }
416 return (rv);
417 } else {
418 return (KERN_SUCCESS);
419 }
420 }
421
422 static int
423 __elfN(load_section)(struct vmspace *vmspace,
424 vm_object_t object, vm_offset_t offset,
425 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot,
426 size_t pagesize)
427 {
428 struct sf_buf *sf;
429 size_t map_len;
430 vm_offset_t map_addr;
431 int error, rv, cow;
432 size_t copy_len;
433 vm_offset_t file_addr;
434
435 /*
436 * It's necessary to fail if the filsz + offset taken from the
437 * header is greater than the actual file pager object's size.
438 * If we were to allow this, then the vm_map_find() below would
439 * walk right off the end of the file object and into the ether.
440 *
441 * While I'm here, might as well check for something else that
442 * is invalid: filsz cannot be greater than memsz.
443 */
444 if ((off_t)filsz + offset > object->un_pager.vnp.vnp_size ||
445 filsz > memsz) {
446 uprintf("elf_load_section: truncated ELF file\n");
447 return (ENOEXEC);
448 }
449
450 map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize);
451 file_addr = trunc_page_ps(offset, pagesize);
452
453 /*
454 * We have two choices. We can either clear the data in the last page
455 * of an oversized mapping, or we can start the anon mapping a page
456 * early and copy the initialized data into that first page. We
457 * choose the second..
458 */
459 if (memsz > filsz)
460 map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr;
461 else
462 map_len = round_page_ps(offset + filsz, pagesize) - file_addr;
463
464 if (map_len != 0) {
465 /* cow flags: don't dump readonly sections in core */
466 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT |
467 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP);
468
469 rv = __elfN(map_insert)(&vmspace->vm_map,
470 object,
471 file_addr, /* file offset */
472 map_addr, /* virtual start */
473 map_addr + map_len,/* virtual end */
474 prot,
475 cow);
476 if (rv != KERN_SUCCESS)
477 return (EINVAL);
478
479 /* we can stop now if we've covered it all */
480 if (memsz == filsz) {
481 return (0);
482 }
483 }
484
485
486 /*
487 * We have to get the remaining bit of the file into the first part
488 * of the oversized map segment. This is normally because the .data
489 * segment in the file is extended to provide bss. It's a neat idea
490 * to try and save a page, but it's a pain in the behind to implement.
491 */
492 copy_len = (offset + filsz) - trunc_page_ps(offset + filsz, pagesize);
493 map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize);
494 map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) -
495 map_addr;
496
497 /* This had damn well better be true! */
498 if (map_len != 0) {
499 rv = __elfN(map_insert)(&vmspace->vm_map, NULL, 0, map_addr,
500 map_addr + map_len, VM_PROT_ALL, 0);
501 if (rv != KERN_SUCCESS) {
502 return (EINVAL);
503 }
504 }
505
506 if (copy_len != 0) {
507 vm_offset_t off;
508
509 sf = vm_imgact_map_page(object, offset + filsz);
510 if (sf == NULL)
511 return (EIO);
512
513 /* send the page fragment to user space */
514 off = trunc_page_ps(offset + filsz, pagesize) -
515 trunc_page(offset + filsz);
516 error = copyout((caddr_t)sf_buf_kva(sf) + off,
517 (caddr_t)map_addr, copy_len);
518 vm_imgact_unmap_page(sf);
519 if (error) {
520 return (error);
521 }
522 }
523
524 /*
525 * set it to the specified protection.
526 * XXX had better undo the damage from pasting over the cracks here!
527 */
528 vm_map_protect(&vmspace->vm_map, trunc_page(map_addr),
529 round_page(map_addr + map_len), prot, FALSE);
530
531 return (0);
532 }
533
534 /*
535 * Load the file "file" into memory. It may be either a shared object
536 * or an executable.
537 *
538 * The "addr" reference parameter is in/out. On entry, it specifies
539 * the address where a shared object should be loaded. If the file is
540 * an executable, this value is ignored. On exit, "addr" specifies
541 * where the file was actually loaded.
542 *
543 * The "entry" reference parameter is out only. On exit, it specifies
544 * the entry point for the loaded file.
545 */
546 static int
547 __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
548 u_long *entry, size_t pagesize)
549 {
550 struct {
551 struct nameidata nd;
552 struct vattr attr;
553 struct image_params image_params;
554 } *tempdata;
555 const Elf_Ehdr *hdr = NULL;
556 const Elf_Phdr *phdr = NULL;
557 struct nameidata *nd;
558 struct vmspace *vmspace = p->p_vmspace;
559 struct vattr *attr;
560 struct image_params *imgp;
561 vm_prot_t prot;
562 u_long rbase;
563 u_long base_addr = 0;
564 int vfslocked, error, i, numsegs;
565
566 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK);
567 nd = &tempdata->nd;
568 attr = &tempdata->attr;
569 imgp = &tempdata->image_params;
570
571 /*
572 * Initialize part of the common data
573 */
574 imgp->proc = p;
575 imgp->attr = attr;
576 imgp->firstpage = NULL;
577 imgp->image_header = NULL;
578 imgp->object = NULL;
579 imgp->execlabel = NULL;
580
581 NDINIT(nd, LOOKUP, MPSAFE|LOCKLEAF|FOLLOW, UIO_SYSSPACE, file,
582 curthread);
583 vfslocked = 0;
584 if ((error = namei(nd)) != 0) {
585 nd->ni_vp = NULL;
586 goto fail;
587 }
588 vfslocked = NDHASGIANT(nd);
589 NDFREE(nd, NDF_ONLY_PNBUF);
590 imgp->vp = nd->ni_vp;
591
592 /*
593 * Check permissions, modes, uid, etc on the file, and "open" it.
594 */
595 error = exec_check_permissions(imgp);
596 if (error)
597 goto fail;
598
599 error = exec_map_first_page(imgp);
600 if (error)
601 goto fail;
602
603 /*
604 * Also make certain that the interpreter stays the same, so set
605 * its VV_TEXT flag, too.
606 */
607 nd->ni_vp->v_vflag |= VV_TEXT;
608
609 imgp->object = nd->ni_vp->v_object;
610
611 hdr = (const Elf_Ehdr *)imgp->image_header;
612 if ((error = __elfN(check_header)(hdr)) != 0)
613 goto fail;
614 if (hdr->e_type == ET_DYN)
615 rbase = *addr;
616 else if (hdr->e_type == ET_EXEC)
617 rbase = 0;
618 else {
619 error = ENOEXEC;
620 goto fail;
621 }
622
623 /* Only support headers that fit within first page for now */
624 /* (multiplication of two Elf_Half fields will not overflow) */
625 if ((hdr->e_phoff > PAGE_SIZE) ||
626 (hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE - hdr->e_phoff) {
627 error = ENOEXEC;
628 goto fail;
629 }
630
631 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
632 if (!aligned(phdr, Elf_Addr)) {
633 error = ENOEXEC;
634 goto fail;
635 }
636
637 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) {
638 if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) {
639 /* Loadable segment */
640 prot = 0;
641 if (phdr[i].p_flags & PF_X)
642 prot |= VM_PROT_EXECUTE;
643 if (phdr[i].p_flags & PF_W)
644 prot |= VM_PROT_WRITE;
645 if (phdr[i].p_flags & PF_R)
646 prot |= VM_PROT_READ;
647
648 if ((error = __elfN(load_section)(vmspace,
649 imgp->object, phdr[i].p_offset,
650 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase,
651 phdr[i].p_memsz, phdr[i].p_filesz, prot,
652 pagesize)) != 0)
653 goto fail;
654 /*
655 * Establish the base address if this is the
656 * first segment.
657 */
658 if (numsegs == 0)
659 base_addr = trunc_page(phdr[i].p_vaddr +
660 rbase);
661 numsegs++;
662 }
663 }
664 *addr = base_addr;
665 *entry = (unsigned long)hdr->e_entry + rbase;
666
667 fail:
668 if (imgp->firstpage)
669 exec_unmap_first_page(imgp);
670
671 if (nd->ni_vp)
672 vput(nd->ni_vp);
673
674 VFS_UNLOCK_GIANT(vfslocked);
675 free(tempdata, M_TEMP);
676
677 return (error);
678 }
679
680 static int
681 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp)
682 {
683 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
684 const Elf_Phdr *phdr;
685 Elf_Auxargs *elf_auxargs;
686 struct vmspace *vmspace;
687 vm_prot_t prot;
688 u_long text_size = 0, data_size = 0, total_size = 0;
689 u_long text_addr = 0, data_addr = 0;
690 u_long seg_size, seg_addr;
691 u_long addr, baddr, et_dyn_addr, entry = 0, proghdr = 0;
692 int32_t osrel = 0;
693 int error = 0, i, n;
694 const char *interp = NULL, *newinterp = NULL;
695 Elf_Brandinfo *brand_info;
696 char *path;
697 struct sysentvec *sv;
698
699 /*
700 * Do we have a valid ELF header ?
701 *
702 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later
703 * if particular brand doesn't support it.
704 */
705 if (__elfN(check_header)(hdr) != 0 ||
706 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN))
707 return (-1);
708
709 /*
710 * From here on down, we return an errno, not -1, as we've
711 * detected an ELF file.
712 */
713
714 if ((hdr->e_phoff > PAGE_SIZE) ||
715 (hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) {
716 /* Only support headers in first page for now */
717 return (ENOEXEC);
718 }
719 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
720 if (!aligned(phdr, Elf_Addr))
721 return (ENOEXEC);
722 n = 0;
723 baddr = 0;
724 for (i = 0; i < hdr->e_phnum; i++) {
725 if (phdr[i].p_type == PT_LOAD) {
726 if (n == 0)
727 baddr = phdr[i].p_vaddr;
728 n++;
729 continue;
730 }
731 if (phdr[i].p_type == PT_INTERP) {
732 /* Path to interpreter */
733 if (phdr[i].p_filesz > MAXPATHLEN ||
734 phdr[i].p_offset + phdr[i].p_filesz > PAGE_SIZE)
735 return (ENOEXEC);
736 interp = imgp->image_header + phdr[i].p_offset;
737 continue;
738 }
739 }
740
741 brand_info = __elfN(get_brandinfo)(imgp, interp, &osrel);
742 if (brand_info == NULL) {
743 uprintf("ELF binary type \"%u\" not known.\n",
744 hdr->e_ident[EI_OSABI]);
745 return (ENOEXEC);
746 }
747 if (hdr->e_type == ET_DYN) {
748 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0)
749 return (ENOEXEC);
750 /*
751 * Honour the base load address from the dso if it is
752 * non-zero for some reason.
753 */
754 if (baddr == 0)
755 et_dyn_addr = ET_DYN_LOAD_ADDR;
756 else
757 et_dyn_addr = 0;
758 } else
759 et_dyn_addr = 0;
760 sv = brand_info->sysvec;
761 if (interp != NULL && brand_info->interp_newpath != NULL)
762 newinterp = brand_info->interp_newpath;
763
764 /*
765 * Avoid a possible deadlock if the current address space is destroyed
766 * and that address space maps the locked vnode. In the common case,
767 * the locked vnode's v_usecount is decremented but remains greater
768 * than zero. Consequently, the vnode lock is not needed by vrele().
769 * However, in cases where the vnode lock is external, such as nullfs,
770 * v_usecount may become zero.
771 */
772 VOP_UNLOCK(imgp->vp, 0);
773
774 error = exec_new_vmspace(imgp, sv);
775 imgp->proc->p_sysent = sv;
776
777 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
778 if (error)
779 return (error);
780
781 vmspace = imgp->proc->p_vmspace;
782
783 for (i = 0; i < hdr->e_phnum; i++) {
784 switch (phdr[i].p_type) {
785 case PT_LOAD: /* Loadable segment */
786 if (phdr[i].p_memsz == 0)
787 break;
788 prot = 0;
789 if (phdr[i].p_flags & PF_X)
790 prot |= VM_PROT_EXECUTE;
791 if (phdr[i].p_flags & PF_W)
792 prot |= VM_PROT_WRITE;
793 if (phdr[i].p_flags & PF_R)
794 prot |= VM_PROT_READ;
795
796 #if defined(__ia64__) && __ELF_WORD_SIZE == 32 && defined(IA32_ME_HARDER)
797 /*
798 * Some x86 binaries assume read == executable,
799 * notably the M3 runtime and therefore cvsup
800 */
801 if (prot & VM_PROT_READ)
802 prot |= VM_PROT_EXECUTE;
803 #endif
804
805 if ((error = __elfN(load_section)(vmspace,
806 imgp->object, phdr[i].p_offset,
807 (caddr_t)(uintptr_t)phdr[i].p_vaddr + et_dyn_addr,
808 phdr[i].p_memsz, phdr[i].p_filesz, prot,
809 sv->sv_pagesize)) != 0)
810 return (error);
811
812 /*
813 * If this segment contains the program headers,
814 * remember their virtual address for the AT_PHDR
815 * aux entry. Static binaries don't usually include
816 * a PT_PHDR entry.
817 */
818 if (phdr[i].p_offset == 0 &&
819 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize
820 <= phdr[i].p_filesz)
821 proghdr = phdr[i].p_vaddr + hdr->e_phoff +
822 et_dyn_addr;
823
824 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr);
825 seg_size = round_page(phdr[i].p_memsz +
826 phdr[i].p_vaddr + et_dyn_addr - seg_addr);
827
828 /*
829 * Is this .text or .data? We can't use
830 * VM_PROT_WRITE or VM_PROT_EXEC, it breaks the
831 * alpha terribly and possibly does other bad
832 * things so we stick to the old way of figuring
833 * it out: If the segment contains the program
834 * entry point, it's a text segment, otherwise it
835 * is a data segment.
836 *
837 * Note that obreak() assumes that data_addr +
838 * data_size == end of data load area, and the ELF
839 * file format expects segments to be sorted by
840 * address. If multiple data segments exist, the
841 * last one will be used.
842 */
843 if (hdr->e_entry >= phdr[i].p_vaddr &&
844 hdr->e_entry < (phdr[i].p_vaddr +
845 phdr[i].p_memsz)) {
846 text_size = seg_size;
847 text_addr = seg_addr;
848 entry = (u_long)hdr->e_entry + et_dyn_addr;
849 } else {
850 data_size = seg_size;
851 data_addr = seg_addr;
852 }
853 total_size += seg_size;
854 break;
855 case PT_PHDR: /* Program header table info */
856 proghdr = phdr[i].p_vaddr + et_dyn_addr;
857 break;
858 default:
859 break;
860 }
861 }
862
863 if (data_addr == 0 && data_size == 0) {
864 data_addr = text_addr;
865 data_size = text_size;
866 }
867
868 /*
869 * Check limits. It should be safe to check the
870 * limits after loading the segments since we do
871 * not actually fault in all the segments pages.
872 */
873 PROC_LOCK(imgp->proc);
874 if (data_size > lim_cur(imgp->proc, RLIMIT_DATA) ||
875 text_size > maxtsiz ||
876 total_size > lim_cur(imgp->proc, RLIMIT_VMEM)) {
877 PROC_UNLOCK(imgp->proc);
878 return (ENOMEM);
879 }
880
881 vmspace->vm_tsize = text_size >> PAGE_SHIFT;
882 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr;
883 vmspace->vm_dsize = data_size >> PAGE_SHIFT;
884 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr;
885
886 /*
887 * We load the dynamic linker where a userland call
888 * to mmap(0, ...) would put it. The rationale behind this
889 * calculation is that it leaves room for the heap to grow to
890 * its maximum allowed size.
891 */
892 addr = round_page((vm_offset_t)imgp->proc->p_vmspace->vm_daddr +
893 lim_max(imgp->proc, RLIMIT_DATA));
894 PROC_UNLOCK(imgp->proc);
895
896 imgp->entry_addr = entry;
897
898 if (interp != NULL) {
899 int have_interp = FALSE;
900 VOP_UNLOCK(imgp->vp, 0);
901 if (brand_info->emul_path != NULL &&
902 brand_info->emul_path[0] != '\0') {
903 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
904 snprintf(path, MAXPATHLEN, "%s%s",
905 brand_info->emul_path, interp);
906 error = __elfN(load_file)(imgp->proc, path, &addr,
907 &imgp->entry_addr, sv->sv_pagesize);
908 free(path, M_TEMP);
909 if (error == 0)
910 have_interp = TRUE;
911 }
912 if (!have_interp && newinterp != NULL) {
913 error = __elfN(load_file)(imgp->proc, newinterp, &addr,
914 &imgp->entry_addr, sv->sv_pagesize);
915 if (error == 0)
916 have_interp = TRUE;
917 }
918 if (!have_interp) {
919 error = __elfN(load_file)(imgp->proc, interp, &addr,
920 &imgp->entry_addr, sv->sv_pagesize);
921 }
922 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
923 if (error != 0) {
924 uprintf("ELF interpreter %s not found\n", interp);
925 return (error);
926 }
927 } else
928 addr = et_dyn_addr;
929
930 /*
931 * Construct auxargs table (used by the fixup routine)
932 */
933 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK);
934 elf_auxargs->execfd = -1;
935 elf_auxargs->phdr = proghdr;
936 elf_auxargs->phent = hdr->e_phentsize;
937 elf_auxargs->phnum = hdr->e_phnum;
938 elf_auxargs->pagesz = PAGE_SIZE;
939 elf_auxargs->base = addr;
940 elf_auxargs->flags = 0;
941 elf_auxargs->entry = entry;
942
943 imgp->auxargs = elf_auxargs;
944 imgp->interpreted = 0;
945 imgp->proc->p_osrel = osrel;
946
947 return (error);
948 }
949
950 #define suword __CONCAT(suword, __ELF_WORD_SIZE)
951
952 int
953 __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp)
954 {
955 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs;
956 Elf_Addr *base;
957 Elf_Addr *pos;
958
959 base = (Elf_Addr *)*stack_base;
960 pos = base + (imgp->args->argc + imgp->args->envc + 2);
961
962 if (args->execfd != -1)
963 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
964 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
965 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
966 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
967 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
968 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
969 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
970 AUXARGS_ENTRY(pos, AT_BASE, args->base);
971 if (imgp->execpathp != 0)
972 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp);
973 AUXARGS_ENTRY(pos, AT_NULL, 0);
974
975 free(imgp->auxargs, M_TEMP);
976 imgp->auxargs = NULL;
977
978 base--;
979 suword(base, (long)imgp->args->argc);
980 *stack_base = (register_t *)base;
981 return (0);
982 }
983
984 /*
985 * Code for generating ELF core dumps.
986 */
987
988 typedef void (*segment_callback)(vm_map_entry_t, void *);
989
990 /* Closure for cb_put_phdr(). */
991 struct phdr_closure {
992 Elf_Phdr *phdr; /* Program header to fill in */
993 Elf_Off offset; /* Offset of segment in core file */
994 };
995
996 /* Closure for cb_size_segment(). */
997 struct sseg_closure {
998 int count; /* Count of writable segments. */
999 size_t size; /* Total size of all writable segments. */
1000 };
1001
1002 static void cb_put_phdr(vm_map_entry_t, void *);
1003 static void cb_size_segment(vm_map_entry_t, void *);
1004 static void each_writable_segment(struct thread *, segment_callback, void *);
1005 static int __elfN(corehdr)(struct thread *, struct vnode *, struct ucred *,
1006 int, void *, size_t);
1007 static void __elfN(puthdr)(struct thread *, void *, size_t *, int);
1008 static void __elfN(putnote)(void *, size_t *, const char *, int,
1009 const void *, size_t);
1010
1011 int
1012 __elfN(coredump)(td, vp, limit)
1013 struct thread *td;
1014 struct vnode *vp;
1015 off_t limit;
1016 {
1017 struct ucred *cred = td->td_ucred;
1018 int error = 0;
1019 struct sseg_closure seginfo;
1020 void *hdr;
1021 size_t hdrsize;
1022
1023 /* Size the program segments. */
1024 seginfo.count = 0;
1025 seginfo.size = 0;
1026 each_writable_segment(td, cb_size_segment, &seginfo);
1027
1028 /*
1029 * Calculate the size of the core file header area by making
1030 * a dry run of generating it. Nothing is written, but the
1031 * size is calculated.
1032 */
1033 hdrsize = 0;
1034 __elfN(puthdr)(td, (void *)NULL, &hdrsize, seginfo.count);
1035
1036 if (hdrsize + seginfo.size >= limit)
1037 return (EFAULT);
1038
1039 /*
1040 * Allocate memory for building the header, fill it up,
1041 * and write it out.
1042 */
1043 hdr = malloc(hdrsize, M_TEMP, M_WAITOK);
1044 if (hdr == NULL) {
1045 return (EINVAL);
1046 }
1047 error = __elfN(corehdr)(td, vp, cred, seginfo.count, hdr, hdrsize);
1048
1049 /* Write the contents of all of the writable segments. */
1050 if (error == 0) {
1051 Elf_Phdr *php;
1052 off_t offset;
1053 int i;
1054
1055 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1;
1056 offset = hdrsize;
1057 for (i = 0; i < seginfo.count; i++) {
1058 error = vn_rdwr_inchunks(UIO_WRITE, vp,
1059 (caddr_t)(uintptr_t)php->p_vaddr,
1060 php->p_filesz, offset, UIO_USERSPACE,
1061 IO_UNIT | IO_DIRECT, cred, NOCRED, NULL,
1062 curthread);
1063 if (error != 0)
1064 break;
1065 offset += php->p_filesz;
1066 php++;
1067 }
1068 }
1069 free(hdr, M_TEMP);
1070
1071 return (error);
1072 }
1073
1074 /*
1075 * A callback for each_writable_segment() to write out the segment's
1076 * program header entry.
1077 */
1078 static void
1079 cb_put_phdr(entry, closure)
1080 vm_map_entry_t entry;
1081 void *closure;
1082 {
1083 struct phdr_closure *phc = (struct phdr_closure *)closure;
1084 Elf_Phdr *phdr = phc->phdr;
1085
1086 phc->offset = round_page(phc->offset);
1087
1088 phdr->p_type = PT_LOAD;
1089 phdr->p_offset = phc->offset;
1090 phdr->p_vaddr = entry->start;
1091 phdr->p_paddr = 0;
1092 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
1093 phdr->p_align = PAGE_SIZE;
1094 phdr->p_flags = 0;
1095 if (entry->protection & VM_PROT_READ)
1096 phdr->p_flags |= PF_R;
1097 if (entry->protection & VM_PROT_WRITE)
1098 phdr->p_flags |= PF_W;
1099 if (entry->protection & VM_PROT_EXECUTE)
1100 phdr->p_flags |= PF_X;
1101
1102 phc->offset += phdr->p_filesz;
1103 phc->phdr++;
1104 }
1105
1106 /*
1107 * A callback for each_writable_segment() to gather information about
1108 * the number of segments and their total size.
1109 */
1110 static void
1111 cb_size_segment(entry, closure)
1112 vm_map_entry_t entry;
1113 void *closure;
1114 {
1115 struct sseg_closure *ssc = (struct sseg_closure *)closure;
1116
1117 ssc->count++;
1118 ssc->size += entry->end - entry->start;
1119 }
1120
1121 /*
1122 * For each writable segment in the process's memory map, call the given
1123 * function with a pointer to the map entry and some arbitrary
1124 * caller-supplied data.
1125 */
1126 static void
1127 each_writable_segment(td, func, closure)
1128 struct thread *td;
1129 segment_callback func;
1130 void *closure;
1131 {
1132 struct proc *p = td->td_proc;
1133 vm_map_t map = &p->p_vmspace->vm_map;
1134 vm_map_entry_t entry;
1135 vm_object_t backing_object, object;
1136 boolean_t ignore_entry;
1137
1138 vm_map_lock_read(map);
1139 for (entry = map->header.next; entry != &map->header;
1140 entry = entry->next) {
1141 /*
1142 * Don't dump inaccessible mappings, deal with legacy
1143 * coredump mode.
1144 *
1145 * Note that read-only segments related to the elf binary
1146 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer
1147 * need to arbitrarily ignore such segments.
1148 */
1149 if (elf_legacy_coredump) {
1150 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW)
1151 continue;
1152 } else {
1153 if ((entry->protection & VM_PROT_ALL) == 0)
1154 continue;
1155 }
1156
1157 /*
1158 * Dont include memory segment in the coredump if
1159 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in
1160 * madvise(2). Do not dump submaps (i.e. parts of the
1161 * kernel map).
1162 */
1163 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP))
1164 continue;
1165
1166 if ((object = entry->object.vm_object) == NULL)
1167 continue;
1168
1169 /* Ignore memory-mapped devices and such things. */
1170 VM_OBJECT_LOCK(object);
1171 while ((backing_object = object->backing_object) != NULL) {
1172 VM_OBJECT_LOCK(backing_object);
1173 VM_OBJECT_UNLOCK(object);
1174 object = backing_object;
1175 }
1176 ignore_entry = object->type != OBJT_DEFAULT &&
1177 object->type != OBJT_SWAP && object->type != OBJT_VNODE;
1178 VM_OBJECT_UNLOCK(object);
1179 if (ignore_entry)
1180 continue;
1181
1182 (*func)(entry, closure);
1183 }
1184 vm_map_unlock_read(map);
1185 }
1186
1187 /*
1188 * Write the core file header to the file, including padding up to
1189 * the page boundary.
1190 */
1191 static int
1192 __elfN(corehdr)(td, vp, cred, numsegs, hdr, hdrsize)
1193 struct thread *td;
1194 struct vnode *vp;
1195 struct ucred *cred;
1196 int numsegs;
1197 size_t hdrsize;
1198 void *hdr;
1199 {
1200 size_t off;
1201
1202 /* Fill in the header. */
1203 bzero(hdr, hdrsize);
1204 off = 0;
1205 __elfN(puthdr)(td, hdr, &off, numsegs);
1206
1207 /* Write it to the core file. */
1208 return (vn_rdwr_inchunks(UIO_WRITE, vp, hdr, hdrsize, (off_t)0,
1209 UIO_SYSSPACE, IO_UNIT | IO_DIRECT, cred, NOCRED, NULL,
1210 td));
1211 }
1212
1213 #if defined(COMPAT_IA32) && __ELF_WORD_SIZE == 32
1214 typedef struct prstatus32 elf_prstatus_t;
1215 typedef struct prpsinfo32 elf_prpsinfo_t;
1216 typedef struct fpreg32 elf_prfpregset_t;
1217 typedef struct fpreg32 elf_fpregset_t;
1218 typedef struct reg32 elf_gregset_t;
1219 #else
1220 typedef prstatus_t elf_prstatus_t;
1221 typedef prpsinfo_t elf_prpsinfo_t;
1222 typedef prfpregset_t elf_prfpregset_t;
1223 typedef prfpregset_t elf_fpregset_t;
1224 typedef gregset_t elf_gregset_t;
1225 #endif
1226
1227 static void
1228 __elfN(puthdr)(struct thread *td, void *dst, size_t *off, int numsegs)
1229 {
1230 struct {
1231 elf_prstatus_t status;
1232 elf_prfpregset_t fpregset;
1233 elf_prpsinfo_t psinfo;
1234 } *tempdata;
1235 elf_prstatus_t *status;
1236 elf_prfpregset_t *fpregset;
1237 elf_prpsinfo_t *psinfo;
1238 struct proc *p;
1239 struct thread *thr;
1240 size_t ehoff, noteoff, notesz, phoff;
1241
1242 p = td->td_proc;
1243
1244 ehoff = *off;
1245 *off += sizeof(Elf_Ehdr);
1246
1247 phoff = *off;
1248 *off += (numsegs + 1) * sizeof(Elf_Phdr);
1249
1250 noteoff = *off;
1251 /*
1252 * Don't allocate space for the notes if we're just calculating
1253 * the size of the header. We also don't collect the data.
1254 */
1255 if (dst != NULL) {
1256 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_ZERO|M_WAITOK);
1257 status = &tempdata->status;
1258 fpregset = &tempdata->fpregset;
1259 psinfo = &tempdata->psinfo;
1260 } else {
1261 tempdata = NULL;
1262 status = NULL;
1263 fpregset = NULL;
1264 psinfo = NULL;
1265 }
1266
1267 if (dst != NULL) {
1268 psinfo->pr_version = PRPSINFO_VERSION;
1269 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t);
1270 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname));
1271 /*
1272 * XXX - We don't fill in the command line arguments properly
1273 * yet.
1274 */
1275 strlcpy(psinfo->pr_psargs, p->p_comm,
1276 sizeof(psinfo->pr_psargs));
1277 }
1278 __elfN(putnote)(dst, off, "FreeBSD", NT_PRPSINFO, psinfo,
1279 sizeof *psinfo);
1280
1281 /*
1282 * To have the debugger select the right thread (LWP) as the initial
1283 * thread, we dump the state of the thread passed to us in td first.
1284 * This is the thread that causes the core dump and thus likely to
1285 * be the right thread one wants to have selected in the debugger.
1286 */
1287 thr = td;
1288 while (thr != NULL) {
1289 if (dst != NULL) {
1290 status->pr_version = PRSTATUS_VERSION;
1291 status->pr_statussz = sizeof(elf_prstatus_t);
1292 status->pr_gregsetsz = sizeof(elf_gregset_t);
1293 status->pr_fpregsetsz = sizeof(elf_fpregset_t);
1294 status->pr_osreldate = osreldate;
1295 status->pr_cursig = p->p_sig;
1296 status->pr_pid = thr->td_tid;
1297 #if defined(COMPAT_IA32) && __ELF_WORD_SIZE == 32
1298 fill_regs32(thr, &status->pr_reg);
1299 fill_fpregs32(thr, fpregset);
1300 #else
1301 fill_regs(thr, &status->pr_reg);
1302 fill_fpregs(thr, fpregset);
1303 #endif
1304 }
1305 __elfN(putnote)(dst, off, "FreeBSD", NT_PRSTATUS, status,
1306 sizeof *status);
1307 __elfN(putnote)(dst, off, "FreeBSD", NT_FPREGSET, fpregset,
1308 sizeof *fpregset);
1309 /*
1310 * Allow for MD specific notes, as well as any MD
1311 * specific preparations for writing MI notes.
1312 */
1313 __elfN(dump_thread)(thr, dst, off);
1314
1315 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) :
1316 TAILQ_NEXT(thr, td_plist);
1317 if (thr == td)
1318 thr = TAILQ_NEXT(thr, td_plist);
1319 }
1320
1321 notesz = *off - noteoff;
1322
1323 if (dst != NULL)
1324 free(tempdata, M_TEMP);
1325
1326 /* Align up to a page boundary for the program segments. */
1327 *off = round_page(*off);
1328
1329 if (dst != NULL) {
1330 Elf_Ehdr *ehdr;
1331 Elf_Phdr *phdr;
1332 struct phdr_closure phc;
1333
1334 /*
1335 * Fill in the ELF header.
1336 */
1337 ehdr = (Elf_Ehdr *)((char *)dst + ehoff);
1338 ehdr->e_ident[EI_MAG0] = ELFMAG0;
1339 ehdr->e_ident[EI_MAG1] = ELFMAG1;
1340 ehdr->e_ident[EI_MAG2] = ELFMAG2;
1341 ehdr->e_ident[EI_MAG3] = ELFMAG3;
1342 ehdr->e_ident[EI_CLASS] = ELF_CLASS;
1343 ehdr->e_ident[EI_DATA] = ELF_DATA;
1344 ehdr->e_ident[EI_VERSION] = EV_CURRENT;
1345 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
1346 ehdr->e_ident[EI_ABIVERSION] = 0;
1347 ehdr->e_ident[EI_PAD] = 0;
1348 ehdr->e_type = ET_CORE;
1349 #if defined(COMPAT_IA32) && __ELF_WORD_SIZE == 32
1350 ehdr->e_machine = EM_386;
1351 #else
1352 ehdr->e_machine = ELF_ARCH;
1353 #endif
1354 ehdr->e_version = EV_CURRENT;
1355 ehdr->e_entry = 0;
1356 ehdr->e_phoff = phoff;
1357 ehdr->e_flags = 0;
1358 ehdr->e_ehsize = sizeof(Elf_Ehdr);
1359 ehdr->e_phentsize = sizeof(Elf_Phdr);
1360 ehdr->e_phnum = numsegs + 1;
1361 ehdr->e_shentsize = sizeof(Elf_Shdr);
1362 ehdr->e_shnum = 0;
1363 ehdr->e_shstrndx = SHN_UNDEF;
1364
1365 /*
1366 * Fill in the program header entries.
1367 */
1368 phdr = (Elf_Phdr *)((char *)dst + phoff);
1369
1370 /* The note segement. */
1371 phdr->p_type = PT_NOTE;
1372 phdr->p_offset = noteoff;
1373 phdr->p_vaddr = 0;
1374 phdr->p_paddr = 0;
1375 phdr->p_filesz = notesz;
1376 phdr->p_memsz = 0;
1377 phdr->p_flags = 0;
1378 phdr->p_align = 0;
1379 phdr++;
1380
1381 /* All the writable segments from the program. */
1382 phc.phdr = phdr;
1383 phc.offset = *off;
1384 each_writable_segment(td, cb_put_phdr, &phc);
1385 }
1386 }
1387
1388 static void
1389 __elfN(putnote)(void *dst, size_t *off, const char *name, int type,
1390 const void *desc, size_t descsz)
1391 {
1392 Elf_Note note;
1393
1394 note.n_namesz = strlen(name) + 1;
1395 note.n_descsz = descsz;
1396 note.n_type = type;
1397 if (dst != NULL)
1398 bcopy(¬e, (char *)dst + *off, sizeof note);
1399 *off += sizeof note;
1400 if (dst != NULL)
1401 bcopy(name, (char *)dst + *off, note.n_namesz);
1402 *off += roundup2(note.n_namesz, sizeof(Elf_Size));
1403 if (dst != NULL)
1404 bcopy(desc, (char *)dst + *off, note.n_descsz);
1405 *off += roundup2(note.n_descsz, sizeof(Elf_Size));
1406 }
1407
1408 /*
1409 * Try to find the appropriate ABI-note section for checknote,
1410 * fetch the osreldate for binary from the ELF OSABI-note. Only the
1411 * first page of the image is searched, the same as for headers.
1412 */
1413 static boolean_t
1414 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote,
1415 int32_t *osrel)
1416 {
1417 const Elf_Note *note, *note0, *note_end;
1418 const Elf_Phdr *phdr, *pnote;
1419 const Elf_Ehdr *hdr;
1420 const char *note_name;
1421 int i;
1422
1423 pnote = NULL;
1424 hdr = (const Elf_Ehdr *)imgp->image_header;
1425 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
1426
1427 for (i = 0; i < hdr->e_phnum; i++) {
1428 if (phdr[i].p_type == PT_NOTE) {
1429 pnote = &phdr[i];
1430 break;
1431 }
1432 }
1433
1434 if (pnote == NULL || pnote->p_offset >= PAGE_SIZE ||
1435 pnote->p_offset + pnote->p_filesz >= PAGE_SIZE)
1436 return (FALSE);
1437
1438 note = note0 = (const Elf_Note *)(imgp->image_header + pnote->p_offset);
1439 note_end = (const Elf_Note *)(imgp->image_header +
1440 pnote->p_offset + pnote->p_filesz);
1441 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) {
1442 if (!aligned(note, Elf32_Addr))
1443 return (FALSE);
1444 if (note->n_namesz != checknote->hdr.n_namesz ||
1445 note->n_descsz != checknote->hdr.n_descsz ||
1446 note->n_type != checknote->hdr.n_type)
1447 goto nextnote;
1448 note_name = (const char *)(note + 1);
1449 if (strncmp(checknote->vendor, note_name,
1450 checknote->hdr.n_namesz) != 0)
1451 goto nextnote;
1452
1453 /*
1454 * Fetch the osreldate for binary
1455 * from the ELF OSABI-note if necessary.
1456 */
1457 if ((checknote->flags & BN_TRANSLATE_OSREL) != 0 &&
1458 checknote->trans_osrel != NULL)
1459 return (checknote->trans_osrel(note, osrel));
1460 return (TRUE);
1461
1462 nextnote:
1463 note = (const Elf_Note *)((const char *)(note + 1) +
1464 roundup2(note->n_namesz, sizeof(Elf32_Addr)) +
1465 roundup2(note->n_descsz, sizeof(Elf32_Addr)));
1466 }
1467
1468 return (FALSE);
1469 }
1470
1471 /*
1472 * Tell kern_execve.c about it, with a little help from the linker.
1473 */
1474 static struct execsw __elfN(execsw) = {
1475 __CONCAT(exec_, __elfN(imgact)),
1476 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
1477 };
1478 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw));
Cache object: aee43032b71731dee6b50e04c298aab8
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