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("$FreeBSD$");
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_trace = 0;
106 SYSCTL_INT(_debug, OID_AUTO, __elfN(trace), CTLFLAG_RW, &elf_trace, 0, "");
107
108 static int elf_legacy_coredump = 0;
109 SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW,
110 &elf_legacy_coredump, 0, "");
111
112 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS];
113
114 #define trunc_page_ps(va, ps) ((va) & ~(ps - 1))
115 #define round_page_ps(va, ps) (((va) + (ps - 1)) & ~(ps - 1))
116 #define aligned(a, t) (trunc_page_ps((u_long)(a), sizeof(t)) == (u_long)(a))
117
118 static const char FREEBSD_ABI_VENDOR[] = "FreeBSD";
119
120 Elf_Brandnote __elfN(freebsd_brandnote) = {
121 .hdr.n_namesz = sizeof(FREEBSD_ABI_VENDOR),
122 .hdr.n_descsz = sizeof(int32_t),
123 .hdr.n_type = 1,
124 .vendor = FREEBSD_ABI_VENDOR,
125 .flags = BN_TRANSLATE_OSREL,
126 .trans_osrel = __elfN(freebsd_trans_osrel)
127 };
128
129 static boolean_t
130 __elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel)
131 {
132 uintptr_t p;
133
134 p = (uintptr_t)(note + 1);
135 p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
136 *osrel = *(const int32_t *)(p);
137
138 return (TRUE);
139 }
140
141 static const char GNU_ABI_VENDOR[] = "GNU";
142 static int GNU_KFREEBSD_ABI_DESC = 3;
143
144 Elf_Brandnote __elfN(kfreebsd_brandnote) = {
145 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR),
146 .hdr.n_descsz = 16, /* XXX at least 16 */
147 .hdr.n_type = 1,
148 .vendor = GNU_ABI_VENDOR,
149 .flags = BN_TRANSLATE_OSREL,
150 .trans_osrel = kfreebsd_trans_osrel
151 };
152
153 static boolean_t
154 kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel)
155 {
156 const Elf32_Word *desc;
157 uintptr_t p;
158
159 p = (uintptr_t)(note + 1);
160 p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
161
162 desc = (const Elf32_Word *)p;
163 if (desc[0] != GNU_KFREEBSD_ABI_DESC)
164 return (FALSE);
165
166 /*
167 * Debian GNU/kFreeBSD embed the earliest compatible kernel version
168 * (__FreeBSD_version: <major><two digit minor>Rxx) in the LSB way.
169 */
170 *osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3];
171
172 return (TRUE);
173 }
174
175 int
176 __elfN(insert_brand_entry)(Elf_Brandinfo *entry)
177 {
178 int i;
179
180 for (i = 0; i < MAX_BRANDS; i++) {
181 if (elf_brand_list[i] == NULL) {
182 elf_brand_list[i] = entry;
183 break;
184 }
185 }
186 if (i == MAX_BRANDS)
187 return (-1);
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 if (curthread->td_proc != p)
567 panic("elf_load_file - thread"); /* XXXKSE DIAGNOSTIC */
568
569 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK);
570 nd = &tempdata->nd;
571 attr = &tempdata->attr;
572 imgp = &tempdata->image_params;
573
574 /*
575 * Initialize part of the common data
576 */
577 imgp->proc = p;
578 imgp->attr = attr;
579 imgp->firstpage = NULL;
580 imgp->image_header = NULL;
581 imgp->object = NULL;
582 imgp->execlabel = NULL;
583
584 /* XXXKSE */
585 NDINIT(nd, LOOKUP, MPSAFE|LOCKLEAF|FOLLOW, UIO_SYSSPACE, file,
586 curthread);
587 vfslocked = 0;
588 if ((error = namei(nd)) != 0) {
589 nd->ni_vp = NULL;
590 goto fail;
591 }
592 vfslocked = NDHASGIANT(nd);
593 NDFREE(nd, NDF_ONLY_PNBUF);
594 imgp->vp = nd->ni_vp;
595
596 /*
597 * Check permissions, modes, uid, etc on the file, and "open" it.
598 */
599 error = exec_check_permissions(imgp);
600 if (error)
601 goto fail;
602
603 error = exec_map_first_page(imgp);
604 if (error)
605 goto fail;
606
607 /*
608 * Also make certain that the interpreter stays the same, so set
609 * its VV_TEXT flag, too.
610 */
611 nd->ni_vp->v_vflag |= VV_TEXT;
612
613 imgp->object = nd->ni_vp->v_object;
614
615 hdr = (const Elf_Ehdr *)imgp->image_header;
616 if ((error = __elfN(check_header)(hdr)) != 0)
617 goto fail;
618 if (hdr->e_type == ET_DYN)
619 rbase = *addr;
620 else if (hdr->e_type == ET_EXEC)
621 rbase = 0;
622 else {
623 error = ENOEXEC;
624 goto fail;
625 }
626
627 /* Only support headers that fit within first page for now */
628 /* (multiplication of two Elf_Half fields will not overflow) */
629 if ((hdr->e_phoff > PAGE_SIZE) ||
630 (hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE - hdr->e_phoff) {
631 error = ENOEXEC;
632 goto fail;
633 }
634
635 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
636 if (!aligned(phdr, Elf_Addr)) {
637 error = ENOEXEC;
638 goto fail;
639 }
640
641 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) {
642 if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) {
643 /* Loadable segment */
644 prot = 0;
645 if (phdr[i].p_flags & PF_X)
646 prot |= VM_PROT_EXECUTE;
647 if (phdr[i].p_flags & PF_W)
648 prot |= VM_PROT_WRITE;
649 if (phdr[i].p_flags & PF_R)
650 prot |= VM_PROT_READ;
651
652 if ((error = __elfN(load_section)(vmspace,
653 imgp->object, phdr[i].p_offset,
654 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase,
655 phdr[i].p_memsz, phdr[i].p_filesz, prot,
656 pagesize)) != 0)
657 goto fail;
658 /*
659 * Establish the base address if this is the
660 * first segment.
661 */
662 if (numsegs == 0)
663 base_addr = trunc_page(phdr[i].p_vaddr +
664 rbase);
665 numsegs++;
666 }
667 }
668 *addr = base_addr;
669 *entry = (unsigned long)hdr->e_entry + rbase;
670
671 fail:
672 if (imgp->firstpage)
673 exec_unmap_first_page(imgp);
674
675 if (nd->ni_vp)
676 vput(nd->ni_vp);
677
678 VFS_UNLOCK_GIANT(vfslocked);
679 free(tempdata, M_TEMP);
680
681 return (error);
682 }
683
684 static int
685 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp)
686 {
687 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
688 const Elf_Phdr *phdr;
689 Elf_Auxargs *elf_auxargs;
690 struct vmspace *vmspace;
691 vm_prot_t prot;
692 u_long text_size = 0, data_size = 0, total_size = 0;
693 u_long text_addr = 0, data_addr = 0;
694 u_long seg_size, seg_addr;
695 u_long addr, baddr, et_dyn_addr, entry = 0, proghdr = 0;
696 int32_t osrel = 0;
697 int error = 0, i, n;
698 const char *interp = NULL, *newinterp = NULL;
699 Elf_Brandinfo *brand_info;
700 char *path;
701 struct thread *td = curthread;
702 struct sysentvec *sv;
703
704 /*
705 * Do we have a valid ELF header ?
706 *
707 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later
708 * if particular brand doesn't support it.
709 */
710 if (__elfN(check_header)(hdr) != 0 ||
711 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN))
712 return (-1);
713
714 /*
715 * From here on down, we return an errno, not -1, as we've
716 * detected an ELF file.
717 */
718
719 if ((hdr->e_phoff > PAGE_SIZE) ||
720 (hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) {
721 /* Only support headers in first page for now */
722 return (ENOEXEC);
723 }
724 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
725 if (!aligned(phdr, Elf_Addr))
726 return (ENOEXEC);
727 n = 0;
728 baddr = 0;
729 for (i = 0; i < hdr->e_phnum; i++) {
730 if (phdr[i].p_type == PT_LOAD) {
731 if (n == 0)
732 baddr = phdr[i].p_vaddr;
733 n++;
734 continue;
735 }
736 if (phdr[i].p_type == PT_INTERP) {
737 /* Path to interpreter */
738 if (phdr[i].p_filesz > MAXPATHLEN ||
739 phdr[i].p_offset + phdr[i].p_filesz > PAGE_SIZE)
740 return (ENOEXEC);
741 interp = imgp->image_header + phdr[i].p_offset;
742 continue;
743 }
744 }
745
746 brand_info = __elfN(get_brandinfo)(imgp, interp, &osrel);
747 if (brand_info == NULL) {
748 uprintf("ELF binary type \"%u\" not known.\n",
749 hdr->e_ident[EI_OSABI]);
750 return (ENOEXEC);
751 }
752 if (hdr->e_type == ET_DYN) {
753 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0)
754 return (ENOEXEC);
755 /*
756 * Honour the base load address from the dso if it is
757 * non-zero for some reason.
758 */
759 if (baddr == 0)
760 et_dyn_addr = ET_DYN_LOAD_ADDR;
761 else
762 et_dyn_addr = 0;
763 } else
764 et_dyn_addr = 0;
765 sv = brand_info->sysvec;
766 if (interp != NULL && brand_info->interp_newpath != NULL)
767 newinterp = brand_info->interp_newpath;
768
769 /*
770 * Avoid a possible deadlock if the current address space is destroyed
771 * and that address space maps the locked vnode. In the common case,
772 * the locked vnode's v_usecount is decremented but remains greater
773 * than zero. Consequently, the vnode lock is not needed by vrele().
774 * However, in cases where the vnode lock is external, such as nullfs,
775 * v_usecount may become zero.
776 */
777 VOP_UNLOCK(imgp->vp, 0, td);
778
779 error = exec_new_vmspace(imgp, sv);
780 imgp->proc->p_sysent = sv;
781
782 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY, td);
783 if (error)
784 return (error);
785
786 vmspace = imgp->proc->p_vmspace;
787
788 for (i = 0; i < hdr->e_phnum; i++) {
789 switch (phdr[i].p_type) {
790 case PT_LOAD: /* Loadable segment */
791 if (phdr[i].p_memsz == 0)
792 break;
793 prot = 0;
794 if (phdr[i].p_flags & PF_X)
795 prot |= VM_PROT_EXECUTE;
796 if (phdr[i].p_flags & PF_W)
797 prot |= VM_PROT_WRITE;
798 if (phdr[i].p_flags & PF_R)
799 prot |= VM_PROT_READ;
800
801 #if defined(__ia64__) && __ELF_WORD_SIZE == 32 && defined(IA32_ME_HARDER)
802 /*
803 * Some x86 binaries assume read == executable,
804 * notably the M3 runtime and therefore cvsup
805 */
806 if (prot & VM_PROT_READ)
807 prot |= VM_PROT_EXECUTE;
808 #endif
809
810 if ((error = __elfN(load_section)(vmspace,
811 imgp->object, phdr[i].p_offset,
812 (caddr_t)(uintptr_t)phdr[i].p_vaddr + et_dyn_addr,
813 phdr[i].p_memsz, phdr[i].p_filesz, prot,
814 sv->sv_pagesize)) != 0)
815 return (error);
816
817 /*
818 * If this segment contains the program headers,
819 * remember their virtual address for the AT_PHDR
820 * aux entry. Static binaries don't usually include
821 * a PT_PHDR entry.
822 */
823 if (phdr[i].p_offset == 0 &&
824 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize
825 <= phdr[i].p_filesz)
826 proghdr = phdr[i].p_vaddr + hdr->e_phoff +
827 et_dyn_addr;
828
829 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr);
830 seg_size = round_page(phdr[i].p_memsz +
831 phdr[i].p_vaddr + et_dyn_addr - seg_addr);
832
833 /*
834 * Is this .text or .data? We can't use
835 * VM_PROT_WRITE or VM_PROT_EXEC, it breaks the
836 * alpha terribly and possibly does other bad
837 * things so we stick to the old way of figuring
838 * it out: If the segment contains the program
839 * entry point, it's a text segment, otherwise it
840 * is a data segment.
841 *
842 * Note that obreak() assumes that data_addr +
843 * data_size == end of data load area, and the ELF
844 * file format expects segments to be sorted by
845 * address. If multiple data segments exist, the
846 * last one will be used.
847 */
848 if (hdr->e_entry >= phdr[i].p_vaddr &&
849 hdr->e_entry < (phdr[i].p_vaddr +
850 phdr[i].p_memsz)) {
851 text_size = seg_size;
852 text_addr = seg_addr;
853 entry = (u_long)hdr->e_entry + et_dyn_addr;
854 } else {
855 data_size = seg_size;
856 data_addr = seg_addr;
857 }
858 total_size += seg_size;
859 break;
860 case PT_PHDR: /* Program header table info */
861 proghdr = phdr[i].p_vaddr + et_dyn_addr;
862 break;
863 default:
864 break;
865 }
866 }
867
868 if (data_addr == 0 && data_size == 0) {
869 data_addr = text_addr;
870 data_size = text_size;
871 }
872
873 /*
874 * Check limits. It should be safe to check the
875 * limits after loading the segments since we do
876 * not actually fault in all the segments pages.
877 */
878 PROC_LOCK(imgp->proc);
879 if (data_size > lim_cur(imgp->proc, RLIMIT_DATA) ||
880 text_size > maxtsiz ||
881 total_size > lim_cur(imgp->proc, RLIMIT_VMEM)) {
882 PROC_UNLOCK(imgp->proc);
883 return (ENOMEM);
884 }
885
886 vmspace->vm_tsize = text_size >> PAGE_SHIFT;
887 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr;
888 vmspace->vm_dsize = data_size >> PAGE_SHIFT;
889 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr;
890
891 /*
892 * We load the dynamic linker where a userland call
893 * to mmap(0, ...) would put it. The rationale behind this
894 * calculation is that it leaves room for the heap to grow to
895 * its maximum allowed size.
896 */
897 addr = round_page((vm_offset_t)imgp->proc->p_vmspace->vm_daddr +
898 lim_max(imgp->proc, RLIMIT_DATA));
899 PROC_UNLOCK(imgp->proc);
900
901 imgp->entry_addr = entry;
902
903 if (interp != NULL) {
904 int have_interp = FALSE;
905 VOP_UNLOCK(imgp->vp, 0, td);
906 if (brand_info->emul_path != NULL &&
907 brand_info->emul_path[0] != '\0') {
908 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
909 snprintf(path, MAXPATHLEN, "%s%s",
910 brand_info->emul_path, interp);
911 error = __elfN(load_file)(imgp->proc, path, &addr,
912 &imgp->entry_addr, sv->sv_pagesize);
913 free(path, M_TEMP);
914 if (error == 0)
915 have_interp = TRUE;
916 }
917 if (!have_interp && newinterp != NULL) {
918 error = __elfN(load_file)(imgp->proc, newinterp, &addr,
919 &imgp->entry_addr, sv->sv_pagesize);
920 if (error == 0)
921 have_interp = TRUE;
922 }
923 if (!have_interp) {
924 error = __elfN(load_file)(imgp->proc, interp, &addr,
925 &imgp->entry_addr, sv->sv_pagesize);
926 }
927 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY, td);
928 if (error != 0) {
929 uprintf("ELF interpreter %s not found\n", interp);
930 return (error);
931 }
932 } else
933 addr = et_dyn_addr;
934
935 /*
936 * Construct auxargs table (used by the fixup routine)
937 */
938 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK);
939 elf_auxargs->execfd = -1;
940 elf_auxargs->phdr = proghdr;
941 elf_auxargs->phent = hdr->e_phentsize;
942 elf_auxargs->phnum = hdr->e_phnum;
943 elf_auxargs->pagesz = PAGE_SIZE;
944 elf_auxargs->base = addr;
945 elf_auxargs->flags = 0;
946 elf_auxargs->entry = entry;
947 elf_auxargs->trace = elf_trace;
948
949 imgp->auxargs = elf_auxargs;
950 imgp->interpreted = 0;
951 imgp->proc->p_osrel = osrel;
952
953 return (error);
954 }
955
956 #define suword __CONCAT(suword, __ELF_WORD_SIZE)
957
958 int
959 __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp)
960 {
961 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs;
962 Elf_Addr *base;
963 Elf_Addr *pos;
964
965 base = (Elf_Addr *)*stack_base;
966 pos = base + (imgp->args->argc + imgp->args->envc + 2);
967
968 if (args->execfd != -1) {
969 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
970 }
971 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
972 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
973 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
974 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
975 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
976 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
977 AUXARGS_ENTRY(pos, AT_BASE, args->base);
978 if (imgp->execpathp != 0)
979 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp);
980 AUXARGS_ENTRY(pos, AT_NULL, 0);
981
982 free(imgp->auxargs, M_TEMP);
983 imgp->auxargs = NULL;
984
985 base--;
986 suword(base, (long)imgp->args->argc);
987 *stack_base = (register_t *)base;
988 return (0);
989 }
990
991 /*
992 * Code for generating ELF core dumps.
993 */
994
995 typedef void (*segment_callback)(vm_map_entry_t, void *);
996
997 /* Closure for cb_put_phdr(). */
998 struct phdr_closure {
999 Elf_Phdr *phdr; /* Program header to fill in */
1000 Elf_Off offset; /* Offset of segment in core file */
1001 };
1002
1003 /* Closure for cb_size_segment(). */
1004 struct sseg_closure {
1005 int count; /* Count of writable segments. */
1006 size_t size; /* Total size of all writable segments. */
1007 };
1008
1009 static void cb_put_phdr(vm_map_entry_t, void *);
1010 static void cb_size_segment(vm_map_entry_t, void *);
1011 static void each_writable_segment(struct thread *, segment_callback, void *);
1012 static int __elfN(corehdr)(struct thread *, struct vnode *, struct ucred *,
1013 int, void *, size_t);
1014 static void __elfN(puthdr)(struct thread *, void *, size_t *, int);
1015 static void __elfN(putnote)(void *, size_t *, const char *, int,
1016 const void *, size_t);
1017
1018 int
1019 __elfN(coredump)(td, vp, limit)
1020 struct thread *td;
1021 struct vnode *vp;
1022 off_t limit;
1023 {
1024 struct ucred *cred = td->td_ucred;
1025 int error = 0;
1026 struct sseg_closure seginfo;
1027 void *hdr;
1028 size_t hdrsize;
1029
1030 /* Size the program segments. */
1031 seginfo.count = 0;
1032 seginfo.size = 0;
1033 each_writable_segment(td, cb_size_segment, &seginfo);
1034
1035 /*
1036 * Calculate the size of the core file header area by making
1037 * a dry run of generating it. Nothing is written, but the
1038 * size is calculated.
1039 */
1040 hdrsize = 0;
1041 __elfN(puthdr)(td, (void *)NULL, &hdrsize, seginfo.count);
1042
1043 if (hdrsize + seginfo.size >= limit)
1044 return (EFAULT);
1045
1046 /*
1047 * Allocate memory for building the header, fill it up,
1048 * and write it out.
1049 */
1050 hdr = malloc(hdrsize, M_TEMP, M_WAITOK);
1051 if (hdr == NULL) {
1052 return (EINVAL);
1053 }
1054 error = __elfN(corehdr)(td, vp, cred, seginfo.count, hdr, hdrsize);
1055
1056 /* Write the contents of all of the writable segments. */
1057 if (error == 0) {
1058 Elf_Phdr *php;
1059 off_t offset;
1060 int i;
1061
1062 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1;
1063 offset = hdrsize;
1064 for (i = 0; i < seginfo.count; i++) {
1065 error = vn_rdwr_inchunks(UIO_WRITE, vp,
1066 (caddr_t)(uintptr_t)php->p_vaddr,
1067 php->p_filesz, offset, UIO_USERSPACE,
1068 IO_UNIT | IO_DIRECT, cred, NOCRED, NULL,
1069 curthread); /* XXXKSE */
1070 if (error != 0)
1071 break;
1072 offset += php->p_filesz;
1073 php++;
1074 }
1075 }
1076 free(hdr, M_TEMP);
1077
1078 return (error);
1079 }
1080
1081 /*
1082 * A callback for each_writable_segment() to write out the segment's
1083 * program header entry.
1084 */
1085 static void
1086 cb_put_phdr(entry, closure)
1087 vm_map_entry_t entry;
1088 void *closure;
1089 {
1090 struct phdr_closure *phc = (struct phdr_closure *)closure;
1091 Elf_Phdr *phdr = phc->phdr;
1092
1093 phc->offset = round_page(phc->offset);
1094
1095 phdr->p_type = PT_LOAD;
1096 phdr->p_offset = phc->offset;
1097 phdr->p_vaddr = entry->start;
1098 phdr->p_paddr = 0;
1099 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
1100 phdr->p_align = PAGE_SIZE;
1101 phdr->p_flags = 0;
1102 if (entry->protection & VM_PROT_READ)
1103 phdr->p_flags |= PF_R;
1104 if (entry->protection & VM_PROT_WRITE)
1105 phdr->p_flags |= PF_W;
1106 if (entry->protection & VM_PROT_EXECUTE)
1107 phdr->p_flags |= PF_X;
1108
1109 phc->offset += phdr->p_filesz;
1110 phc->phdr++;
1111 }
1112
1113 /*
1114 * A callback for each_writable_segment() to gather information about
1115 * the number of segments and their total size.
1116 */
1117 static void
1118 cb_size_segment(entry, closure)
1119 vm_map_entry_t entry;
1120 void *closure;
1121 {
1122 struct sseg_closure *ssc = (struct sseg_closure *)closure;
1123
1124 ssc->count++;
1125 ssc->size += entry->end - entry->start;
1126 }
1127
1128 /*
1129 * For each writable segment in the process's memory map, call the given
1130 * function with a pointer to the map entry and some arbitrary
1131 * caller-supplied data.
1132 */
1133 static void
1134 each_writable_segment(td, func, closure)
1135 struct thread *td;
1136 segment_callback func;
1137 void *closure;
1138 {
1139 struct proc *p = td->td_proc;
1140 vm_map_t map = &p->p_vmspace->vm_map;
1141 vm_map_entry_t entry;
1142 vm_object_t backing_object, object;
1143 boolean_t ignore_entry;
1144
1145 vm_map_lock_read(map);
1146 for (entry = map->header.next; entry != &map->header;
1147 entry = entry->next) {
1148 /*
1149 * Don't dump inaccessible mappings, deal with legacy
1150 * coredump mode.
1151 *
1152 * Note that read-only segments related to the elf binary
1153 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer
1154 * need to arbitrarily ignore such segments.
1155 */
1156 if (elf_legacy_coredump) {
1157 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW)
1158 continue;
1159 } else {
1160 if ((entry->protection & VM_PROT_ALL) == 0)
1161 continue;
1162 }
1163
1164 /*
1165 * Dont include memory segment in the coredump if
1166 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in
1167 * madvise(2). Do not dump submaps (i.e. parts of the
1168 * kernel map).
1169 */
1170 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP))
1171 continue;
1172
1173 if ((object = entry->object.vm_object) == NULL)
1174 continue;
1175
1176 /* Ignore memory-mapped devices and such things. */
1177 VM_OBJECT_LOCK(object);
1178 while ((backing_object = object->backing_object) != NULL) {
1179 VM_OBJECT_LOCK(backing_object);
1180 VM_OBJECT_UNLOCK(object);
1181 object = backing_object;
1182 }
1183 ignore_entry = object->type != OBJT_DEFAULT &&
1184 object->type != OBJT_SWAP && object->type != OBJT_VNODE;
1185 VM_OBJECT_UNLOCK(object);
1186 if (ignore_entry)
1187 continue;
1188
1189 (*func)(entry, closure);
1190 }
1191 vm_map_unlock_read(map);
1192 }
1193
1194 /*
1195 * Write the core file header to the file, including padding up to
1196 * the page boundary.
1197 */
1198 static int
1199 __elfN(corehdr)(td, vp, cred, numsegs, hdr, hdrsize)
1200 struct thread *td;
1201 struct vnode *vp;
1202 struct ucred *cred;
1203 int numsegs;
1204 size_t hdrsize;
1205 void *hdr;
1206 {
1207 size_t off;
1208
1209 /* Fill in the header. */
1210 bzero(hdr, hdrsize);
1211 off = 0;
1212 __elfN(puthdr)(td, hdr, &off, numsegs);
1213
1214 /* Write it to the core file. */
1215 return (vn_rdwr_inchunks(UIO_WRITE, vp, hdr, hdrsize, (off_t)0,
1216 UIO_SYSSPACE, IO_UNIT | IO_DIRECT, cred, NOCRED, NULL,
1217 td)); /* XXXKSE */
1218 }
1219
1220 #if defined(COMPAT_IA32) && __ELF_WORD_SIZE == 32
1221 typedef struct prstatus32 elf_prstatus_t;
1222 typedef struct prpsinfo32 elf_prpsinfo_t;
1223 typedef struct fpreg32 elf_prfpregset_t;
1224 typedef struct fpreg32 elf_fpregset_t;
1225 typedef struct reg32 elf_gregset_t;
1226 #else
1227 typedef prstatus_t elf_prstatus_t;
1228 typedef prpsinfo_t elf_prpsinfo_t;
1229 typedef prfpregset_t elf_prfpregset_t;
1230 typedef prfpregset_t elf_fpregset_t;
1231 typedef gregset_t elf_gregset_t;
1232 #endif
1233
1234 static void
1235 __elfN(puthdr)(struct thread *td, void *dst, size_t *off, int numsegs)
1236 {
1237 struct {
1238 elf_prstatus_t status;
1239 elf_prfpregset_t fpregset;
1240 elf_prpsinfo_t psinfo;
1241 } *tempdata;
1242 elf_prstatus_t *status;
1243 elf_prfpregset_t *fpregset;
1244 elf_prpsinfo_t *psinfo;
1245 struct proc *p;
1246 struct thread *thr;
1247 size_t ehoff, noteoff, notesz, phoff;
1248
1249 p = td->td_proc;
1250
1251 ehoff = *off;
1252 *off += sizeof(Elf_Ehdr);
1253
1254 phoff = *off;
1255 *off += (numsegs + 1) * sizeof(Elf_Phdr);
1256
1257 noteoff = *off;
1258 /*
1259 * Don't allocate space for the notes if we're just calculating
1260 * the size of the header. We also don't collect the data.
1261 */
1262 if (dst != NULL) {
1263 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_ZERO|M_WAITOK);
1264 status = &tempdata->status;
1265 fpregset = &tempdata->fpregset;
1266 psinfo = &tempdata->psinfo;
1267 } else {
1268 tempdata = NULL;
1269 status = NULL;
1270 fpregset = NULL;
1271 psinfo = NULL;
1272 }
1273
1274 if (dst != NULL) {
1275 psinfo->pr_version = PRPSINFO_VERSION;
1276 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t);
1277 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname));
1278 /*
1279 * XXX - We don't fill in the command line arguments properly
1280 * yet.
1281 */
1282 strlcpy(psinfo->pr_psargs, p->p_comm,
1283 sizeof(psinfo->pr_psargs));
1284 }
1285 __elfN(putnote)(dst, off, "FreeBSD", NT_PRPSINFO, psinfo,
1286 sizeof *psinfo);
1287
1288 /*
1289 * To have the debugger select the right thread (LWP) as the initial
1290 * thread, we dump the state of the thread passed to us in td first.
1291 * This is the thread that causes the core dump and thus likely to
1292 * be the right thread one wants to have selected in the debugger.
1293 */
1294 thr = td;
1295 while (thr != NULL) {
1296 if (dst != NULL) {
1297 status->pr_version = PRSTATUS_VERSION;
1298 status->pr_statussz = sizeof(elf_prstatus_t);
1299 status->pr_gregsetsz = sizeof(elf_gregset_t);
1300 status->pr_fpregsetsz = sizeof(elf_fpregset_t);
1301 status->pr_osreldate = osreldate;
1302 status->pr_cursig = p->p_sig;
1303 status->pr_pid = thr->td_tid;
1304 #if defined(COMPAT_IA32) && __ELF_WORD_SIZE == 32
1305 fill_regs32(thr, &status->pr_reg);
1306 fill_fpregs32(thr, fpregset);
1307 #else
1308 fill_regs(thr, &status->pr_reg);
1309 fill_fpregs(thr, fpregset);
1310 #endif
1311 }
1312 __elfN(putnote)(dst, off, "FreeBSD", NT_PRSTATUS, status,
1313 sizeof *status);
1314 __elfN(putnote)(dst, off, "FreeBSD", NT_FPREGSET, fpregset,
1315 sizeof *fpregset);
1316 /*
1317 * Allow for MD specific notes, as well as any MD
1318 * specific preparations for writing MI notes.
1319 */
1320 __elfN(dump_thread)(thr, dst, off);
1321
1322 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) :
1323 TAILQ_NEXT(thr, td_plist);
1324 if (thr == td)
1325 thr = TAILQ_NEXT(thr, td_plist);
1326 }
1327
1328 notesz = *off - noteoff;
1329
1330 if (dst != NULL)
1331 free(tempdata, M_TEMP);
1332
1333 /* Align up to a page boundary for the program segments. */
1334 *off = round_page(*off);
1335
1336 if (dst != NULL) {
1337 Elf_Ehdr *ehdr;
1338 Elf_Phdr *phdr;
1339 struct phdr_closure phc;
1340
1341 /*
1342 * Fill in the ELF header.
1343 */
1344 ehdr = (Elf_Ehdr *)((char *)dst + ehoff);
1345 ehdr->e_ident[EI_MAG0] = ELFMAG0;
1346 ehdr->e_ident[EI_MAG1] = ELFMAG1;
1347 ehdr->e_ident[EI_MAG2] = ELFMAG2;
1348 ehdr->e_ident[EI_MAG3] = ELFMAG3;
1349 ehdr->e_ident[EI_CLASS] = ELF_CLASS;
1350 ehdr->e_ident[EI_DATA] = ELF_DATA;
1351 ehdr->e_ident[EI_VERSION] = EV_CURRENT;
1352 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
1353 ehdr->e_ident[EI_ABIVERSION] = 0;
1354 ehdr->e_ident[EI_PAD] = 0;
1355 ehdr->e_type = ET_CORE;
1356 #if defined(COMPAT_IA32) && __ELF_WORD_SIZE == 32
1357 ehdr->e_machine = EM_386;
1358 #else
1359 ehdr->e_machine = ELF_ARCH;
1360 #endif
1361 ehdr->e_version = EV_CURRENT;
1362 ehdr->e_entry = 0;
1363 ehdr->e_phoff = phoff;
1364 ehdr->e_flags = 0;
1365 ehdr->e_ehsize = sizeof(Elf_Ehdr);
1366 ehdr->e_phentsize = sizeof(Elf_Phdr);
1367 ehdr->e_phnum = numsegs + 1;
1368 ehdr->e_shentsize = sizeof(Elf_Shdr);
1369 ehdr->e_shnum = 0;
1370 ehdr->e_shstrndx = SHN_UNDEF;
1371
1372 /*
1373 * Fill in the program header entries.
1374 */
1375 phdr = (Elf_Phdr *)((char *)dst + phoff);
1376
1377 /* The note segement. */
1378 phdr->p_type = PT_NOTE;
1379 phdr->p_offset = noteoff;
1380 phdr->p_vaddr = 0;
1381 phdr->p_paddr = 0;
1382 phdr->p_filesz = notesz;
1383 phdr->p_memsz = 0;
1384 phdr->p_flags = 0;
1385 phdr->p_align = 0;
1386 phdr++;
1387
1388 /* All the writable segments from the program. */
1389 phc.phdr = phdr;
1390 phc.offset = *off;
1391 each_writable_segment(td, cb_put_phdr, &phc);
1392 }
1393 }
1394
1395 static void
1396 __elfN(putnote)(void *dst, size_t *off, const char *name, int type,
1397 const void *desc, size_t descsz)
1398 {
1399 Elf_Note note;
1400
1401 note.n_namesz = strlen(name) + 1;
1402 note.n_descsz = descsz;
1403 note.n_type = type;
1404 if (dst != NULL)
1405 bcopy(¬e, (char *)dst + *off, sizeof note);
1406 *off += sizeof note;
1407 if (dst != NULL)
1408 bcopy(name, (char *)dst + *off, note.n_namesz);
1409 *off += roundup2(note.n_namesz, sizeof(Elf_Size));
1410 if (dst != NULL)
1411 bcopy(desc, (char *)dst + *off, note.n_descsz);
1412 *off += roundup2(note.n_descsz, sizeof(Elf_Size));
1413 }
1414
1415 /*
1416 * Try to find the appropriate ABI-note section for checknote,
1417 * fetch the osreldate for binary from the ELF OSABI-note. Only the
1418 * first page of the image is searched, the same as for headers.
1419 */
1420 static boolean_t
1421 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote,
1422 int32_t *osrel)
1423 {
1424 const Elf_Note *note, *note0, *note_end;
1425 const Elf_Phdr *phdr, *pnote;
1426 const Elf_Ehdr *hdr;
1427 const char *note_name;
1428 int i;
1429
1430 pnote = NULL;
1431 hdr = (const Elf_Ehdr *)imgp->image_header;
1432 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
1433
1434 for (i = 0; i < hdr->e_phnum; i++) {
1435 if (phdr[i].p_type == PT_NOTE) {
1436 pnote = &phdr[i];
1437 break;
1438 }
1439 }
1440
1441 if (pnote == NULL || pnote->p_offset >= PAGE_SIZE ||
1442 pnote->p_offset + pnote->p_filesz >= PAGE_SIZE)
1443 return (FALSE);
1444
1445 note = note0 = (const Elf_Note *)(imgp->image_header + pnote->p_offset);
1446 note_end = (const Elf_Note *)(imgp->image_header +
1447 pnote->p_offset + pnote->p_filesz);
1448 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) {
1449 if (!aligned(note, Elf32_Addr))
1450 return (FALSE);
1451 if (note->n_namesz != checknote->hdr.n_namesz ||
1452 note->n_descsz != checknote->hdr.n_descsz ||
1453 note->n_type != checknote->hdr.n_type)
1454 goto nextnote;
1455 note_name = (const char *)(note + 1);
1456 if (strncmp(checknote->vendor, note_name,
1457 checknote->hdr.n_namesz) != 0)
1458 goto nextnote;
1459
1460 /*
1461 * Fetch the osreldate for binary
1462 * from the ELF OSABI-note if necessary.
1463 */
1464 if ((checknote->flags & BN_TRANSLATE_OSREL) != 0 &&
1465 checknote->trans_osrel != NULL)
1466 return (checknote->trans_osrel(note, osrel));
1467 return (TRUE);
1468
1469 nextnote:
1470 note = (const Elf_Note *)((const char *)(note + 1) +
1471 roundup2(note->n_namesz, sizeof(Elf32_Addr)) +
1472 roundup2(note->n_descsz, sizeof(Elf32_Addr)));
1473 }
1474
1475 return (FALSE);
1476 }
1477
1478 /*
1479 * Tell kern_execve.c about it, with a little help from the linker.
1480 */
1481 static struct execsw __elfN(execsw) = {
1482 __CONCAT(exec_, __elfN(imgact)),
1483 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
1484 };
1485 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw));
Cache object: 4a3094bee41ceefc1694df4dfad51792
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