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kernel - fine-grained namecache and partial vnode MPSAFE work
[dragonfly.git] / sys / kern / imgact_elf.c
blobf20c64da2ada38a8379263f8f75d0c1f1e9f3e7f
1 /*-
2 * Copyright (c) 1995-1996 Søren Schmidt
3 * Copyright (c) 1996 Peter Wemm
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer
11 * in this position and unchanged.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software withough specific prior written permission
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * $FreeBSD: src/sys/kern/imgact_elf.c,v 1.73.2.13 2002/12/28 19:49:41 dillon Exp $
30 * $DragonFly: src/sys/kern/imgact_elf.c,v 1.55 2008/08/17 17:21:36 nth Exp $
31 */
32
33 #include <sys/param.h>
34 #include <sys/exec.h>
35 #include <sys/fcntl.h>
36 #include <sys/file.h>
37 #include <sys/imgact.h>
38 #include <sys/imgact_elf.h>
39 #include <sys/kernel.h>
40 #include <sys/malloc.h>
41 #include <sys/mman.h>
42 #include <sys/systm.h>
43 #include <sys/proc.h>
44 #include <sys/nlookup.h>
45 #include <sys/pioctl.h>
46 #include <sys/procfs.h>
47 #include <sys/resourcevar.h>
48 #include <sys/signalvar.h>
49 #include <sys/stat.h>
50 #include <sys/syscall.h>
51 #include <sys/sysctl.h>
52 #include <sys/sysent.h>
53 #include <sys/vnode.h>
54 #include <sys/sfbuf.h>
55
56 #include <vm/vm.h>
57 #include <vm/vm_kern.h>
58 #include <vm/vm_param.h>
59 #include <vm/pmap.h>
60 #include <sys/lock.h>
61 #include <vm/vm_map.h>
62 #include <vm/vm_object.h>
63 #include <vm/vm_extern.h>
64
65 #include <machine/elf.h>
66 #include <machine/md_var.h>
67 #include <sys/mount.h>
68 #include <sys/ckpt.h>
69 #define OLD_EI_BRAND 8
70
71 __ElfType(Brandinfo);
72 __ElfType(Auxargs);
73
74 static int elf_check_header (const Elf_Ehdr *hdr);
75 static int elf_freebsd_fixup (register_t **stack_base,
76 struct image_params *imgp);
77 static int elf_load_file (struct proc *p, const char *file, u_long *addr,
78 u_long *entry);
79 static int elf_load_section (struct proc *p,
80 struct vmspace *vmspace, struct vnode *vp,
81 vm_offset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz,
82 vm_prot_t prot);
83 static int exec_elf_imgact (struct image_params *imgp);
84
85 static int elf_trace = 0;
86 SYSCTL_INT(_debug, OID_AUTO, elf_trace, CTLFLAG_RW, &elf_trace, 0, "");
87 static int elf_legacy_coredump = 0;
88 SYSCTL_INT(_debug, OID_AUTO, elf_legacy_coredump, CTLFLAG_RW,
89 &elf_legacy_coredump, 0, "");
90
91 static int dragonfly_match_abi_note(const Elf_Note *);
92 static int freebsd_match_abi_note(const Elf_Note *);
93
94 static struct sysentvec elf_freebsd_sysvec = {
95 SYS_MAXSYSCALL,
96 sysent,
97 -1,
98 0,
99 0,
100 0,
101 0,
102 0,
103 elf_freebsd_fixup,
104 sendsig,
105 sigcode,
106 &szsigcode,
107 0,
108 "FreeBSD ELF",
109 elf_coredump,
110 NULL,
111 MINSIGSTKSZ
112 };
113
114 static Elf_Brandinfo freebsd_brand_info = {
115 ELFOSABI_FREEBSD,
116 "FreeBSD",
117 freebsd_match_abi_note,
118 "",
119 "/usr/libexec/ld-elf.so.1",
120 &elf_freebsd_sysvec
121 };
122
123 static Elf_Brandinfo dragonfly_brand_info = {
124 ELFOSABI_NONE,
125 "DragonFly",
126 dragonfly_match_abi_note,
127 "",
128 "/usr/libexec/ld-elf.so.2",
129 &elf_freebsd_sysvec
130 };
131
132 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS] = {
133 &dragonfly_brand_info,
134 &freebsd_brand_info,
135 NULL, NULL, NULL,
136 NULL, NULL, NULL
137 };
138
139 static int
140 freebsd_match_abi_note(const Elf_Note *abi_note)
141 {
142 const char *abi_name = (const char *)
143 ((const uint8_t *)abi_note + sizeof(*abi_note));
144
145 if (abi_note->n_namesz != sizeof("FreeBSD"))
146 return(FALSE);
147 if (memcmp(abi_name, "FreeBSD", sizeof("FreeBSD")))
148 return(FALSE);
149 return(TRUE);
150 }
151
152 static int
153 dragonfly_match_abi_note(const Elf_Note *abi_note)
154 {
155 const char *abi_name = (const char *)
156 ((const uint8_t *)abi_note + sizeof(*abi_note));
157
158 if (abi_note->n_namesz != sizeof("DragonFly"))
159 return(FALSE);
160 if (memcmp(abi_name, "DragonFly", sizeof("DragonFly")))
161 return(FALSE);
162 return(TRUE);
163 }
164
165 int
166 elf_insert_brand_entry(Elf_Brandinfo *entry)
167 {
168 int i;
169
170 for (i=1; i<MAX_BRANDS; i++) {
171 if (elf_brand_list[i] == NULL) {
172 elf_brand_list[i] = entry;
173 break;
174 }
175 }
176 if (i == MAX_BRANDS)
177 return -1;
178 return 0;
179 }
180
181 int
182 elf_remove_brand_entry(Elf_Brandinfo *entry)
183 {
184 int i;
185
186 for (i=1; i<MAX_BRANDS; i++) {
187 if (elf_brand_list[i] == entry) {
188 elf_brand_list[i] = NULL;
189 break;
190 }
191 }
192 if (i == MAX_BRANDS)
193 return -1;
194 return 0;
195 }
196
197 /*
198 * Check if an elf brand is being used anywhere in the system.
199 *
200 * Used by the linux emulation module unloader. This isn't safe from
201 * races.
202 */
203 struct elf_brand_inuse_info {
204 int rval;
205 Elf_Brandinfo *entry;
206 };
207
208 static int elf_brand_inuse_callback(struct proc *p, void *data);
209
210 int
211 elf_brand_inuse(Elf_Brandinfo *entry)
212 {
213 struct elf_brand_inuse_info info;
214
215 info.rval = FALSE;
216 info.entry = entry;
217 allproc_scan(elf_brand_inuse_callback, entry);
218 return (info.rval);
219 }
220
221 static
222 int
223 elf_brand_inuse_callback(struct proc *p, void *data)
224 {
225 struct elf_brand_inuse_info *info = data;
226
227 if (p->p_sysent == info->entry->sysvec) {
228 info->rval = TRUE;
229 return(-1);
230 }
231 return(0);
232 }
233
234 static int
235 elf_check_header(const Elf_Ehdr *hdr)
236 {
237 if (!IS_ELF(*hdr) ||
238 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
239 hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
240 hdr->e_ident[EI_VERSION] != EV_CURRENT ||
241 hdr->e_phentsize != sizeof(Elf_Phdr) ||
242 hdr->e_ehsize != sizeof(Elf_Ehdr) ||
243 hdr->e_version != ELF_TARG_VER)
244 return ENOEXEC;
245
246 if (!ELF_MACHINE_OK(hdr->e_machine))
247 return ENOEXEC;
248
249 return 0;
250 }
251
252 static Elf_Brandinfo *
253 elf_check_abi_note(struct image_params *imgp, const Elf_Phdr *ph)
254 {
255 Elf_Brandinfo *match = NULL;
256 const Elf_Note *tmp_note;
257 struct sf_buf *sfb;
258 const char *page;
259 char *data = NULL;
260 Elf_Off off;
261 size_t firstoff;
262 size_t len;
263 size_t firstlen;
264
265 len = ph->p_filesz;
266 off = ph->p_offset;
267
268 firstoff = off & PAGE_MASK;
269 firstlen = PAGE_SIZE - firstoff;
270
271 if (len < sizeof(Elf_Note) || len > PAGE_SIZE)
272 return NULL; /* ENOEXEC? */
273
274 if (exec_map_page(imgp, off >> PAGE_SHIFT, &sfb, &page))
275 return NULL;
276
277 /*
278 * Crosses page boundary? Is that allowed?
279 */
280 if (firstlen < len) {
281 data = kmalloc(len, M_TEMP, M_WAITOK);
282
283 bcopy(page + firstoff, data, firstlen);
284
285 exec_unmap_page(sfb);
286 if (exec_map_page(imgp, (off >> PAGE_SHIFT) + 1, &sfb, &page)) {
287 kfree(data, M_TEMP);
288 return NULL;
289 }
290 bcopy(page, data + firstlen, len - firstlen);
291 tmp_note = (void *)data;
292 } else {
293 tmp_note = (const void *)(page + firstoff);
294 }
295
296 while (len >= sizeof(Elf_Note)) {
297 int i;
298 size_t nlen = roundup(tmp_note->n_namesz, sizeof(Elf_Word)) +
299 roundup(tmp_note->n_descsz, sizeof(Elf_Word)) +
300 sizeof(Elf_Note);
301
302 if (nlen > len)
303 break;
304
305 if (tmp_note->n_type != 1)
306 goto next;
307
308 for (i = 0; i < MAX_BRANDS; i++) {
309 Elf_Brandinfo *bi = elf_brand_list[i];
310
311 if (bi != NULL && bi->match_abi_note != NULL &&
312 bi->match_abi_note(tmp_note)) {
313 match = bi;
314 break;
315 }
316 }
317
318 if (match != NULL)
319 break;
320
321 next:
322 len -= nlen;
323 tmp_note += nlen;
324 }
325
326 if (data != NULL)
327 kfree(data, M_TEMP);
328 exec_unmap_page(sfb);
329
330 return (match);
331 }
332
333 static int
334 elf_load_section(struct proc *p, struct vmspace *vmspace, struct vnode *vp,
335 vm_offset_t offset, caddr_t vmaddr, size_t memsz,
336 size_t filsz, vm_prot_t prot)
337 {
338 size_t map_len;
339 vm_offset_t map_addr;
340 int error, rv, cow;
341 int count;
342 size_t copy_len;
343 vm_object_t object;
344 vm_offset_t file_addr;
345
346 object = vp->v_object;
347 error = 0;
348
349 /*
350 * It's necessary to fail if the filsz + offset taken from the
351 * header is greater than the actual file pager object's size.
352 * If we were to allow this, then the vm_map_find() below would
353 * walk right off the end of the file object and into the ether.
354 *
355 * While I'm here, might as well check for something else that
356 * is invalid: filsz cannot be greater than memsz.
357 */
358 if ((off_t)filsz + offset > vp->v_filesize || filsz > memsz) {
359 uprintf("elf_load_section: truncated ELF file\n");
360 return (ENOEXEC);
361 }
362
363 map_addr = trunc_page((vm_offset_t)vmaddr);
364 file_addr = trunc_page(offset);
365
366 /*
367 * We have two choices. We can either clear the data in the last page
368 * of an oversized mapping, or we can start the anon mapping a page
369 * early and copy the initialized data into that first page. We
370 * choose the second..
371 */
372 if (memsz > filsz)
373 map_len = trunc_page(offset+filsz) - file_addr;
374 else
375 map_len = round_page(offset+filsz) - file_addr;
376
377 if (map_len != 0) {
378 vm_object_reference(object);
379
380 /* cow flags: don't dump readonly sections in core */
381 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT |
382 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP);
383
384 count = vm_map_entry_reserve(MAP_RESERVE_COUNT);
385 vm_map_lock(&vmspace->vm_map);
386 rv = vm_map_insert(&vmspace->vm_map, &count,
387 object,
388 file_addr, /* file offset */
389 map_addr, /* virtual start */
390 map_addr + map_len,/* virtual end */
391 VM_MAPTYPE_NORMAL,
392 prot, VM_PROT_ALL,
393 cow);
394 vm_map_unlock(&vmspace->vm_map);
395 vm_map_entry_release(count);
396 if (rv != KERN_SUCCESS) {
397 vm_object_deallocate(object);
398 return EINVAL;
399 }
400
401 /* we can stop now if we've covered it all */
402 if (memsz == filsz) {
403 return 0;
404 }
405 }
406
407
408 /*
409 * We have to get the remaining bit of the file into the first part
410 * of the oversized map segment. This is normally because the .data
411 * segment in the file is extended to provide bss. It's a neat idea
412 * to try and save a page, but it's a pain in the behind to implement.
413 */
414 copy_len = (offset + filsz) - trunc_page(offset + filsz);
415 map_addr = trunc_page((vm_offset_t)vmaddr + filsz);
416 map_len = round_page((vm_offset_t)vmaddr + memsz) - map_addr;
417
418 /* This had damn well better be true! */
419 if (map_len != 0) {
420 count = vm_map_entry_reserve(MAP_RESERVE_COUNT);
421 vm_map_lock(&vmspace->vm_map);
422 rv = vm_map_insert(&vmspace->vm_map, &count,
423 NULL, 0,
424 map_addr, map_addr + map_len,
425 VM_MAPTYPE_NORMAL,
426 VM_PROT_ALL, VM_PROT_ALL,
427 0);
428 vm_map_unlock(&vmspace->vm_map);
429 vm_map_entry_release(count);
430 if (rv != KERN_SUCCESS) {
431 return EINVAL;
432 }
433 }
434
435 if (copy_len != 0) {
436 vm_page_t m;
437 struct sf_buf *sf;
438
439 m = vm_fault_object_page(object, trunc_page(offset + filsz),
440 VM_PROT_READ, 0, &error);
441 if (m) {
442 sf = sf_buf_alloc(m, SFB_CPUPRIVATE);
443 error = copyout((caddr_t)sf_buf_kva(sf),
444 (caddr_t)map_addr, copy_len);
445 sf_buf_free(sf);
446 vm_page_unhold(m);
447 }
448 if (error) {
449 return (error);
450 }
451 }
452
453 /*
454 * set it to the specified protection
455 */
456 vm_map_protect(&vmspace->vm_map, map_addr, map_addr + map_len, prot,
457 FALSE);
458
459 return error;
460 }
461
462 /*
463 * Load the file "file" into memory. It may be either a shared object
464 * or an executable.
465 *
466 * The "addr" reference parameter is in/out. On entry, it specifies
467 * the address where a shared object should be loaded. If the file is
468 * an executable, this value is ignored. On exit, "addr" specifies
469 * where the file was actually loaded.
470 *
471 * The "entry" reference parameter is out only. On exit, it specifies
472 * the entry point for the loaded file.
473 */
474 static int
475 elf_load_file(struct proc *p, const char *file, u_long *addr, u_long *entry)
476 {
477 struct {
478 struct nlookupdata nd;
479 struct vattr attr;
480 struct image_params image_params;
481 } *tempdata;
482 const Elf_Ehdr *hdr = NULL;
483 const Elf_Phdr *phdr = NULL;
484 struct nlookupdata *nd;
485 struct vmspace *vmspace = p->p_vmspace;
486 struct vattr *attr;
487 struct image_params *imgp;
488 vm_prot_t prot;
489 u_long rbase;
490 u_long base_addr = 0;
491 int error, i, numsegs;
492
493 tempdata = kmalloc(sizeof(*tempdata), M_TEMP, M_WAITOK);
494 nd = &tempdata->nd;
495 attr = &tempdata->attr;
496 imgp = &tempdata->image_params;
497
498 /*
499 * Initialize part of the common data
500 */
501 imgp->proc = p;
502 imgp->attr = attr;
503 imgp->firstpage = NULL;
504 imgp->image_header = NULL;
505 imgp->vp = NULL;
506
507 error = nlookup_init(nd, file, UIO_SYSSPACE, NLC_FOLLOW);
508 if (error == 0)
509 error = nlookup(nd);
510 if (error == 0)
511 error = cache_vget(&nd->nl_nch, nd->nl_cred, LK_EXCLUSIVE, &imgp->vp);
512 nlookup_done(nd);
513 if (error)
514 goto fail;
515
516 /*
517 * Check permissions, modes, uid, etc on the file, and "open" it.
518 */
519 error = exec_check_permissions(imgp);
520 if (error) {
521 vn_unlock(imgp->vp);
522 goto fail;
523 }
524
525 error = exec_map_first_page(imgp);
526 /*
527 * Also make certain that the interpreter stays the same, so set
528 * its VTEXT flag, too.
529 */
530 if (error == 0)
531 vsetflags(imgp->vp, VTEXT);
532 vn_unlock(imgp->vp);
533 if (error)
534 goto fail;
535
536 hdr = (const Elf_Ehdr *)imgp->image_header;
537 if ((error = elf_check_header(hdr)) != 0)
538 goto fail;
539 if (hdr->e_type == ET_DYN)
540 rbase = *addr;
541 else if (hdr->e_type == ET_EXEC)
542 rbase = 0;
543 else {
544 error = ENOEXEC;
545 goto fail;
546 }
547
548 /* Only support headers that fit within first page for now
549 * (multiplication of two Elf_Half fields will not overflow) */
550 if ((hdr->e_phoff > PAGE_SIZE) ||
551 (hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE - hdr->e_phoff) {
552 error = ENOEXEC;
553 goto fail;
554 }
555
556 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
557
558 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) {
559 if (phdr[i].p_type == PT_LOAD) { /* Loadable segment */
560 prot = 0;
561 if (phdr[i].p_flags & PF_X)
562 prot |= VM_PROT_EXECUTE;
563 if (phdr[i].p_flags & PF_W)
564 prot |= VM_PROT_WRITE;
565 if (phdr[i].p_flags & PF_R)
566 prot |= VM_PROT_READ;
567
568 error = elf_load_section(
569 p, vmspace, imgp->vp,
570 phdr[i].p_offset,
571 (caddr_t)phdr[i].p_vaddr +
572 rbase,
573 phdr[i].p_memsz,
574 phdr[i].p_filesz, prot);
575 if (error != 0)
576 goto fail;
577 /*
578 * Establish the base address if this is the
579 * first segment.
580 */
581 if (numsegs == 0)
582 base_addr = trunc_page(phdr[i].p_vaddr + rbase);
583 numsegs++;
584 }
585 }
586 *addr = base_addr;
587 *entry=(unsigned long)hdr->e_entry + rbase;
588
589 fail:
590 if (imgp->firstpage)
591 exec_unmap_first_page(imgp);
592 if (imgp->vp) {
593 vrele(imgp->vp);
594 imgp->vp = NULL;
595 }
596 kfree(tempdata, M_TEMP);
597
598 return error;
599 }
600
601 /*
602 * non static, as it can be overridden by start_init()
603 */
604 int fallback_elf_brand = -1;
605 SYSCTL_INT(_kern, OID_AUTO, fallback_elf_brand, CTLFLAG_RW,
606 &fallback_elf_brand, -1,
607 "ELF brand of last resort");
608
609 static int can_exec_dyn = 1;
610 SYSCTL_INT(_kern, OID_AUTO, elf_exec_dyn, CTLFLAG_RW,
611 &can_exec_dyn, 1,
612 "ELF: can exec shared libraries");
613
614 static int
615 exec_elf_imgact(struct image_params *imgp)
616 {
617 const Elf_Ehdr *hdr = (const Elf_Ehdr *) imgp->image_header;
618 const Elf_Phdr *phdr;
619 Elf_Auxargs *elf_auxargs = NULL;
620 struct vmspace *vmspace;
621 vm_prot_t prot;
622 u_long text_size = 0, data_size = 0, total_size = 0;
623 u_long text_addr = 0, data_addr = 0;
624 u_long seg_size, seg_addr;
625 u_long addr, entry = 0, proghdr = 0;
626 int error, i;
627 const char *interp = NULL;
628 const Elf_Note *abi_note = NULL;
629 Elf_Brandinfo *brand_info = NULL;
630 char *path;
631
632 error = 0;
633
634 /*
635 * Do we have a valid ELF header ?
636 * We allow execution of ET_EXEC and, if kern.elf_exec_dyn is 1, ET_DYN.
637 */
638 if (elf_check_header(hdr) != 0 ||
639 (hdr->e_type != ET_EXEC && (!can_exec_dyn || hdr->e_type != ET_DYN)))
640 return -1;
641
642 /*
643 * From here on down, we return an errno, not -1, as we've
644 * detected an ELF file.
645 */
646
647 if ((hdr->e_phoff > PAGE_SIZE) ||
648 (hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) {
649 /* Only support headers in first page for now */
650 return ENOEXEC;
651 }
652 phdr = (const Elf_Phdr*)(imgp->image_header + hdr->e_phoff);
653
654 /*
655 * From this point on, we may have resources that need to be freed.
656 */
657
658 exec_new_vmspace(imgp, NULL);
659
660 /*
661 * Yeah, I'm paranoid. There is every reason in the world to get
662 * VTEXT now since from here on out, there are places we can have
663 * a context switch. Better safe than sorry; I really don't want
664 * the file to change while it's being loaded.
665 */
666 vsetflags(imgp->vp, VTEXT);
667
668 vmspace = imgp->proc->p_vmspace;
669
670 for (i = 0; i < hdr->e_phnum; i++) {
671 switch(phdr[i].p_type) {
672
673 case PT_LOAD: /* Loadable segment */
674 prot = 0;
675 if (phdr[i].p_flags & PF_X)
676 prot |= VM_PROT_EXECUTE;
677 if (phdr[i].p_flags & PF_W)
678 prot |= VM_PROT_WRITE;
679 if (phdr[i].p_flags & PF_R)
680 prot |= VM_PROT_READ;
681
682 if ((error = elf_load_section(imgp->proc,
683 vmspace, imgp->vp,
684 phdr[i].p_offset,
685 (caddr_t)phdr[i].p_vaddr,
686 phdr[i].p_memsz,
687 phdr[i].p_filesz, prot)) != 0)
688 goto fail;
689
690 /*
691 * If this segment contains the program headers,
692 * remember their virtual address for the AT_PHDR
693 * aux entry. Static binaries don't usually include
694 * a PT_PHDR entry.
695 */
696 if (phdr[i].p_offset == 0 &&
697 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize
698 <= phdr[i].p_filesz)
699 proghdr = phdr[i].p_vaddr + hdr->e_phoff;
700
701 seg_addr = trunc_page(phdr[i].p_vaddr);
702 seg_size = round_page(phdr[i].p_memsz +
703 phdr[i].p_vaddr - seg_addr);
704
705 /*
706 * Is this .text or .data? We can't use
707 * VM_PROT_WRITE or VM_PROT_EXEC, it breaks the
708 * alpha terribly and possibly does other bad
709 * things so we stick to the old way of figuring
710 * it out: If the segment contains the program
711 * entry point, it's a text segment, otherwise it
712 * is a data segment.
713 *
714 * Note that obreak() assumes that data_addr +
715 * data_size == end of data load area, and the ELF
716 * file format expects segments to be sorted by
717 * address. If multiple data segments exist, the
718 * last one will be used.
719 */
720 if (hdr->e_entry >= phdr[i].p_vaddr &&
721 hdr->e_entry < (phdr[i].p_vaddr +
722 phdr[i].p_memsz)) {
723 text_size = seg_size;
724 text_addr = seg_addr;
725 entry = (u_long)hdr->e_entry;
726 } else {
727 data_size = seg_size;
728 data_addr = seg_addr;
729 }
730 total_size += seg_size;
731
732 /*
733 * Check limits. It should be safe to check the
734 * limits after loading the segment since we do
735 * not actually fault in all the segment's pages.
736 */
737 if (data_size >
738 imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur ||
739 text_size > maxtsiz ||
740 total_size >
741 imgp->proc->p_rlimit[RLIMIT_VMEM].rlim_cur) {
742 error = ENOMEM;
743 goto fail;
744 }
745 break;
746 case PT_INTERP: /* Path to interpreter */
747 if (phdr[i].p_filesz > MAXPATHLEN ||
748 phdr[i].p_offset + phdr[i].p_filesz > PAGE_SIZE) {
749 error = ENOEXEC;
750 goto fail;
751 }
752 interp = imgp->image_header + phdr[i].p_offset;
753 break;
754 case PT_NOTE: /* Check for .note.ABI-tag */
755 if (brand_info == NULL)
756 brand_info = elf_check_abi_note(imgp, &phdr[i]);
757 break;
758 case PT_PHDR: /* Program header table info */
759 proghdr = phdr[i].p_vaddr;
760 break;
761 default:
762 break;
763 }
764 }
765
766 vmspace->vm_tsize = text_size >> PAGE_SHIFT;
767 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr;
768 vmspace->vm_dsize = data_size >> PAGE_SHIFT;
769 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr;
770
771 addr = ELF_RTLD_ADDR(vmspace);
772
773 imgp->entry_addr = entry;
774
775 /* We support three types of branding -- (1) the ELF EI_OSABI field
776 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string
777 * branding w/in the ELF header, and (3) path of the `interp_path'
778 * field. We should also look for an ".note.ABI-tag" ELF section now
779 * in all Linux ELF binaries, FreeBSD 4.1+, and some NetBSD ones.
780 */
781
782 /* If the executable has a brand, search for it in the brand list. */
783 if (brand_info == NULL && hdr->e_ident[EI_OSABI] != ELFOSABI_NONE) {
784 for (i = 0; i < MAX_BRANDS; i++) {
785 Elf_Brandinfo *bi = elf_brand_list[i];
786
787 if (bi != NULL &&
788 (hdr->e_ident[EI_OSABI] == bi->brand
789 || 0 ==
790 strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND],
791 bi->compat_3_brand, strlen(bi->compat_3_brand)))) {
792 brand_info = bi;
793 break;
794 }
795 }
796 }
797
798 /* Search for a recognized ABI. */
799 if (brand_info == NULL && abi_note != NULL) {
800 }
801
802 /*
803 * ELFOSABI_NONE == ELFOSABI_SYSV, so a SYSV binary misses all
804 * checks so far, since it is neither branded nor does it have
805 * an ABI note. If the EI_OSABI field is ELFOSABI_NONE, assume
806 * it is svr4 and look for an entry in the elf_brand_list with
807 * match_abi_note == NULL.
808 */
809 if (brand_info == NULL && hdr->e_ident[EI_OSABI] == ELFOSABI_NONE) {
810 for (i = 0; i < MAX_BRANDS; i++) {
811 Elf_Brandinfo *bi = elf_brand_list[i];
812
813 if (bi != NULL && bi->match_abi_note == NULL &&
814 ELFOSABI_SYSV == bi->brand) {
815 brand_info = bi;
816 break;
817 }
818 }
819 }
820
821 /* Lacking a recognized ABI, search for a recognized interpreter. */
822 if (brand_info == NULL && interp != NULL) {
823 for (i = 0; i < MAX_BRANDS; i++) {
824 Elf_Brandinfo *bi = elf_brand_list[i];
825
826 if (bi != NULL &&
827 strcmp(interp, bi->interp_path) == 0) {
828 brand_info = bi;
829 break;
830 }
831 }
832 }
833
834 /* Lacking a recognized interpreter, try the default brand */
835 if (brand_info == NULL) {
836 for (i = 0; i < MAX_BRANDS; i++) {
837 Elf_Brandinfo *bi = elf_brand_list[i];
838
839 if (bi != NULL && fallback_elf_brand == bi->brand) {
840 brand_info = bi;
841 break;
842 }
843 }
844 }
845
846 if (brand_info == NULL) {
847 uprintf("ELF binary type \"%u\" not known.\n",
848 hdr->e_ident[EI_OSABI]);
849 error = ENOEXEC;
850 goto fail;
851 }
852
853 imgp->proc->p_sysent = brand_info->sysvec;
854 if (interp != NULL) {
855 path = kmalloc(MAXPATHLEN, M_TEMP, M_WAITOK);
856 ksnprintf(path, MAXPATHLEN, "%s%s",
857 brand_info->emul_path, interp);
858 if ((error = elf_load_file(imgp->proc, path, &addr,
859 &imgp->entry_addr)) != 0) {
860 if ((error = elf_load_file(imgp->proc, interp, &addr,
861 &imgp->entry_addr)) != 0) {
862 uprintf("ELF interpreter %s not found\n", path);
863 kfree(path, M_TEMP);
864 goto fail;
865 }
866 }
867 kfree(path, M_TEMP);
868 } else {
869 addr = 0;
870 }
871
872 /*
873 * Construct auxargs table (used by the fixup routine)
874 */
875 elf_auxargs = kmalloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK);
876 elf_auxargs->execfd = -1;
877 elf_auxargs->phdr = proghdr;
878 elf_auxargs->phent = hdr->e_phentsize;
879 elf_auxargs->phnum = hdr->e_phnum;
880 elf_auxargs->pagesz = PAGE_SIZE;
881 elf_auxargs->base = addr;
882 elf_auxargs->flags = 0;
883 elf_auxargs->entry = entry;
884 elf_auxargs->trace = elf_trace;
885
886 imgp->auxargs = elf_auxargs;
887 imgp->interpreted = 0;
888
889 fail:
890 return error;
891 }
892
893 static int
894 elf_freebsd_fixup(register_t **stack_base, struct image_params *imgp)
895 {
896 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs;
897 register_t *pos;
898
899 pos = *stack_base + (imgp->args->argc + imgp->args->envc + 2);
900
901 if (args->trace) {
902 AUXARGS_ENTRY(pos, AT_DEBUG, 1);
903 }
904 if (args->execfd != -1) {
905 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
906 }
907 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
908 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
909 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
910 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
911 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
912 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
913 AUXARGS_ENTRY(pos, AT_BASE, args->base);
914 AUXARGS_ENTRY(pos, AT_NULL, 0);
915
916 kfree(imgp->auxargs, M_TEMP);
917 imgp->auxargs = NULL;
918
919 (*stack_base)--;
920 suword(*stack_base, (long) imgp->args->argc);
921 return 0;
922 }
923
924 /*
925 * Code for generating ELF core dumps.
926 */
927
928 typedef int (*segment_callback) (vm_map_entry_t, void *);
929
930 /* Closure for cb_put_phdr(). */
931 struct phdr_closure {
932 Elf_Phdr *phdr; /* Program header to fill in (incremented) */
933 Elf_Phdr *phdr_max; /* Pointer bound for error check */
934 Elf_Off offset; /* Offset of segment in core file */
935 };
936
937 /* Closure for cb_size_segment(). */
938 struct sseg_closure {
939 int count; /* Count of writable segments. */
940 size_t vsize; /* Total size of all writable segments. */
941 };
942
943 /* Closure for cb_put_fp(). */
944 struct fp_closure {
945 struct vn_hdr *vnh;
946 struct vn_hdr *vnh_max;
947 int count;
948 struct stat *sb;
949 };
950
951 typedef struct elf_buf {
952 char *buf;
953 size_t off;
954 size_t off_max;
955 } *elf_buf_t;
956
957 static void *target_reserve(elf_buf_t target, size_t bytes, int *error);
958
959 static int cb_put_phdr (vm_map_entry_t, void *);
960 static int cb_size_segment (vm_map_entry_t, void *);
961 static int cb_fpcount_segment(vm_map_entry_t, void *);
962 static int cb_put_fp(vm_map_entry_t, void *);
963
964
965 static int each_segment (struct proc *, segment_callback, void *, int);
966 static int elf_corehdr (struct lwp *, int, struct file *, struct ucred *,
967 int, elf_buf_t);
968 enum putmode { WRITE, DRYRUN };
969 static int elf_puthdr (struct lwp *, elf_buf_t, int sig, enum putmode,
970 int, struct file *);
971 static int elf_putallnotes(struct lwp *, elf_buf_t, int, enum putmode);
972 static int elf_putnote (elf_buf_t, const char *, int, const void *, size_t);
973
974 static int elf_putsigs(struct lwp *, elf_buf_t);
975 static int elf_puttextvp(struct proc *, elf_buf_t);
976 static int elf_putfiles(struct proc *, elf_buf_t, struct file *);
977
978 extern int osreldate;
979
980 int
981 elf_coredump(struct lwp *lp, int sig, struct vnode *vp, off_t limit)
982 {
983 struct file *fp;
984 int error;
985
986 if ((error = falloc(NULL, &fp, NULL)) != 0)
987 return (error);
988 fsetcred(fp, lp->lwp_proc->p_ucred);
989
990 /*
991 * XXX fixme.
992 */
993 fp->f_type = DTYPE_VNODE;
994 fp->f_flag = O_CREAT|O_WRONLY|O_NOFOLLOW;
995 fp->f_ops = &vnode_fileops;
996 fp->f_data = vp;
997 vn_unlock(vp);
998
999 error = generic_elf_coredump(lp, sig, fp, limit);
1000
1001 fp->f_type = 0;
1002 fp->f_flag = 0;
1003 fp->f_ops = &badfileops;
1004 fp->f_data = NULL;
1005 fdrop(fp);
1006 return (error);
1007 }
1008
1009 int
1010 generic_elf_coredump(struct lwp *lp, int sig, struct file *fp, off_t limit)
1011 {
1012 struct proc *p = lp->lwp_proc;
1013 struct ucred *cred = p->p_ucred;
1014 int error = 0;
1015 struct sseg_closure seginfo;
1016 struct elf_buf target;
1017
1018 if (!fp)
1019 kprintf("can't dump core - null fp\n");
1020
1021 /*
1022 * Size the program segments
1023 */
1024 seginfo.count = 0;
1025 seginfo.vsize = 0;
1026 each_segment(p, cb_size_segment, &seginfo, 1);
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 bzero(&target, sizeof(target));
1034 elf_puthdr(lp, &target, sig, DRYRUN, seginfo.count, fp);
1035
1036 if (target.off + seginfo.vsize >= limit)
1037 return (EFAULT);
1038
1039 /*
1040 * Allocate memory for building the header, fill it up,
1041 * and write it out.
1042 */
1043 target.off_max = target.off;
1044 target.off = 0;
1045 target.buf = kmalloc(target.off_max, M_TEMP, M_WAITOK|M_ZERO);
1046
1047 error = elf_corehdr(lp, sig, fp, cred, seginfo.count, &target);
1048
1049 /* Write the contents of all of the writable segments. */
1050 if (error == 0) {
1051 Elf_Phdr *php;
1052 int i;
1053 ssize_t nbytes;
1054
1055 php = (Elf_Phdr *)(target.buf + sizeof(Elf_Ehdr)) + 1;
1056 for (i = 0; i < seginfo.count; i++) {
1057 error = fp_write(fp, (caddr_t)php->p_vaddr,
1058 php->p_filesz, &nbytes, UIO_USERSPACE);
1059 if (error != 0)
1060 break;
1061 php++;
1062 }
1063 }
1064 kfree(target.buf, M_TEMP);
1065
1066 return error;
1067 }
1068
1069 /*
1070 * A callback for each_segment() to write out the segment's
1071 * program header entry.
1072 */
1073 static int
1074 cb_put_phdr(vm_map_entry_t entry, void *closure)
1075 {
1076 struct phdr_closure *phc = closure;
1077 Elf_Phdr *phdr = phc->phdr;
1078
1079 if (phc->phdr == phc->phdr_max)
1080 return EINVAL;
1081
1082 phc->offset = round_page(phc->offset);
1083
1084 phdr->p_type = PT_LOAD;
1085 phdr->p_offset = phc->offset;
1086 phdr->p_vaddr = entry->start;
1087 phdr->p_paddr = 0;
1088 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
1089 phdr->p_align = PAGE_SIZE;
1090 phdr->p_flags = 0;
1091 if (entry->protection & VM_PROT_READ)
1092 phdr->p_flags |= PF_R;
1093 if (entry->protection & VM_PROT_WRITE)
1094 phdr->p_flags |= PF_W;
1095 if (entry->protection & VM_PROT_EXECUTE)
1096 phdr->p_flags |= PF_X;
1097
1098 phc->offset += phdr->p_filesz;
1099 ++phc->phdr;
1100 return 0;
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 int
1108 cb_size_segment(vm_map_entry_t entry, void *closure)
1109 {
1110 struct sseg_closure *ssc = closure;
1111
1112 ++ssc->count;
1113 ssc->vsize += entry->end - entry->start;
1114 return 0;
1115 }
1116
1117 /*
1118 * A callback for each_segment() to gather information about
1119 * the number of text segments.
1120 */
1121 static int
1122 cb_fpcount_segment(vm_map_entry_t entry, void *closure)
1123 {
1124 int *count = closure;
1125 struct vnode *vp;
1126
1127 if (entry->object.vm_object->type == OBJT_VNODE) {
1128 vp = (struct vnode *)entry->object.vm_object->handle;
1129 if ((vp->v_flag & VCKPT) && curproc->p_textvp == vp)
1130 return 0;
1131 ++*count;
1132 }
1133 return 0;
1134 }
1135
1136 static int
1137 cb_put_fp(vm_map_entry_t entry, void *closure)
1138 {
1139 struct fp_closure *fpc = closure;
1140 struct vn_hdr *vnh = fpc->vnh;
1141 Elf_Phdr *phdr = &vnh->vnh_phdr;
1142 struct vnode *vp;
1143 int error;
1144
1145 /*
1146 * If an entry represents a vnode then write out a file handle.
1147 *
1148 * If we are checkpointing a checkpoint-restored program we do
1149 * NOT record the filehandle for the old checkpoint vnode (which
1150 * is mapped all over the place). Instead we rely on the fact
1151 * that a checkpoint-restored program does not mmap() the checkpt
1152 * vnode NOCORE, so its contents will be written out to the
1153 * new checkpoint file. This is necessary because the 'old'
1154 * checkpoint file is typically destroyed when a new one is created
1155 * and thus cannot be used to restore the new checkpoint.
1156 *
1157 * Theoretically we could create a chain of checkpoint files and
1158 * operate the checkpointing operation kinda like an incremental
1159 * checkpoint, but a checkpoint restore would then likely wind up
1160 * referencing many prior checkpoint files and that is a bit over
1161 * the top for the purpose of the checkpoint API.
1162 */
1163 if (entry->object.vm_object->type == OBJT_VNODE) {
1164 vp = (struct vnode *)entry->object.vm_object->handle;
1165 if ((vp->v_flag & VCKPT) && curproc->p_textvp == vp)
1166 return 0;
1167 if (vnh == fpc->vnh_max)
1168 return EINVAL;
1169
1170 if (vp->v_mount)
1171 vnh->vnh_fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
1172 error = VFS_VPTOFH(vp, &vnh->vnh_fh.fh_fid);
1173 if (error) {
1174 char *freepath, *fullpath;
1175
1176 if (vn_fullpath(curproc, vp, &fullpath, &freepath)) {
1177 kprintf("Warning: coredump, error %d: cannot store file handle for vnode %p\n", error, vp);
1178 } else {
1179 kprintf("Warning: coredump, error %d: cannot store file handle for %s\n", error, fullpath);
1180 kfree(freepath, M_TEMP);
1181 }
1182 error = 0;
1183 }
1184
1185 phdr->p_type = PT_LOAD;
1186 phdr->p_offset = 0; /* not written to core */
1187 phdr->p_vaddr = entry->start;
1188 phdr->p_paddr = 0;
1189 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
1190 phdr->p_align = PAGE_SIZE;
1191 phdr->p_flags = 0;
1192 if (entry->protection & VM_PROT_READ)
1193 phdr->p_flags |= PF_R;
1194 if (entry->protection & VM_PROT_WRITE)
1195 phdr->p_flags |= PF_W;
1196 if (entry->protection & VM_PROT_EXECUTE)
1197 phdr->p_flags |= PF_X;
1198 ++fpc->vnh;
1199 ++fpc->count;
1200 }
1201 return 0;
1202 }
1203
1204 /*
1205 * For each writable segment in the process's memory map, call the given
1206 * function with a pointer to the map entry and some arbitrary
1207 * caller-supplied data.
1208 */
1209 static int
1210 each_segment(struct proc *p, segment_callback func, void *closure, int writable)
1211 {
1212 int error = 0;
1213 vm_map_t map = &p->p_vmspace->vm_map;
1214 vm_map_entry_t entry;
1215
1216 for (entry = map->header.next; error == 0 && entry != &map->header;
1217 entry = entry->next) {
1218 vm_object_t obj;
1219
1220 /*
1221 * Don't dump inaccessible mappings, deal with legacy
1222 * coredump mode.
1223 *
1224 * Note that read-only segments related to the elf binary
1225 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer
1226 * need to arbitrarily ignore such segments.
1227 */
1228 if (elf_legacy_coredump) {
1229 if (writable && (entry->protection & VM_PROT_RW) != VM_PROT_RW)
1230 continue;
1231 } else {
1232 if (writable && (entry->protection & VM_PROT_ALL) == 0)
1233 continue;
1234 }
1235
1236 /*
1237 * Dont include memory segment in the coredump if
1238 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in
1239 * madvise(2).
1240 *
1241 * Currently we only dump normal VM object maps. We do
1242 * not dump submaps or virtual page tables.
1243 */
1244 if (writable && (entry->eflags & MAP_ENTRY_NOCOREDUMP))
1245 continue;
1246 if (entry->maptype != VM_MAPTYPE_NORMAL)
1247 continue;
1248 if ((obj = entry->object.vm_object) == NULL)
1249 continue;
1250
1251 /* Find the deepest backing object. */
1252 while (obj->backing_object != NULL)
1253 obj = obj->backing_object;
1254
1255 /* Ignore memory-mapped devices and such things. */
1256 if (obj->type != OBJT_DEFAULT &&
1257 obj->type != OBJT_SWAP &&
1258 obj->type != OBJT_VNODE)
1259 continue;
1260
1261 error = (*func)(entry, closure);
1262 }
1263 return error;
1264 }
1265
1266 static
1267 void *
1268 target_reserve(elf_buf_t target, size_t bytes, int *error)
1269 {
1270 void *res = NULL;
1271
1272 if (target->buf) {
1273 if (target->off + bytes > target->off_max)
1274 *error = EINVAL;
1275 else
1276 res = target->buf + target->off;
1277 }
1278 target->off += bytes;
1279 return (res);
1280 }
1281
1282 /*
1283 * Write the core file header to the file, including padding up to
1284 * the page boundary.
1285 */
1286 static int
1287 elf_corehdr(struct lwp *lp, int sig, struct file *fp, struct ucred *cred,
1288 int numsegs, elf_buf_t target)
1289 {
1290 int error;
1291 ssize_t nbytes;
1292
1293 /*
1294 * Fill in the header. The fp is passed so we can detect and flag
1295 * a checkpoint file pointer within the core file itself, because
1296 * it may not be restored from the same file handle.
1297 */
1298 error = elf_puthdr(lp, target, sig, WRITE, numsegs, fp);
1299
1300 /* Write it to the core file. */
1301 if (error == 0) {
1302 error = fp_write(fp, target->buf, target->off, &nbytes,
1303 UIO_SYSSPACE);
1304 }
1305 return error;
1306 }
1307
1308 static int
1309 elf_puthdr(struct lwp *lp, elf_buf_t target, int sig, enum putmode mode,
1310 int numsegs, struct file *fp)
1311 {
1312 struct proc *p = lp->lwp_proc;
1313 int error = 0;
1314 size_t phoff;
1315 size_t noteoff;
1316 size_t notesz;
1317 Elf_Ehdr *ehdr;
1318 Elf_Phdr *phdr;
1319
1320 ehdr = target_reserve(target, sizeof(Elf_Ehdr), &error);
1321
1322 phoff = target->off;
1323 phdr = target_reserve(target, (numsegs + 1) * sizeof(Elf_Phdr), &error);
1324
1325 noteoff = target->off;
1326 if (error == 0)
1327 elf_putallnotes(lp, target, sig, mode);
1328 notesz = target->off - noteoff;
1329
1330 /*
1331 * put extra cruft for dumping process state here
1332 * - we really want it be before all the program
1333 * mappings
1334 * - we just need to update the offset accordingly
1335 * and GDB will be none the wiser.
1336 */
1337 if (error == 0)
1338 error = elf_puttextvp(p, target);
1339 if (error == 0)
1340 error = elf_putsigs(lp, target);
1341 if (error == 0)
1342 error = elf_putfiles(p, target, fp);
1343
1344 /*
1345 * Align up to a page boundary for the program segments. The
1346 * actual data will be written to the outptu file, not to elf_buf_t,
1347 * so we do not have to do any further bounds checking.
1348 */
1349 target->off = round_page(target->off);
1350 if (error == 0 && ehdr != NULL) {
1351 /*
1352 * Fill in the ELF header.
1353 */
1354 ehdr->e_ident[EI_MAG0] = ELFMAG0;
1355 ehdr->e_ident[EI_MAG1] = ELFMAG1;
1356 ehdr->e_ident[EI_MAG2] = ELFMAG2;
1357 ehdr->e_ident[EI_MAG3] = ELFMAG3;
1358 ehdr->e_ident[EI_CLASS] = ELF_CLASS;
1359 ehdr->e_ident[EI_DATA] = ELF_DATA;
1360 ehdr->e_ident[EI_VERSION] = EV_CURRENT;
1361 ehdr->e_ident[EI_OSABI] = ELFOSABI_NONE;
1362 ehdr->e_ident[EI_ABIVERSION] = 0;
1363 ehdr->e_ident[EI_PAD] = 0;
1364 ehdr->e_type = ET_CORE;
1365 ehdr->e_machine = ELF_ARCH;
1366 ehdr->e_version = EV_CURRENT;
1367 ehdr->e_entry = 0;
1368 ehdr->e_phoff = phoff;
1369 ehdr->e_flags = 0;
1370 ehdr->e_ehsize = sizeof(Elf_Ehdr);
1371 ehdr->e_phentsize = sizeof(Elf_Phdr);
1372 ehdr->e_phnum = numsegs + 1;
1373 ehdr->e_shentsize = sizeof(Elf_Shdr);
1374 ehdr->e_shnum = 0;
1375 ehdr->e_shstrndx = SHN_UNDEF;
1376 }
1377 if (error == 0 && phdr != NULL) {
1378 /*
1379 * Fill in the program header entries.
1380 */
1381 struct phdr_closure phc;
1382
1383 /* The note segement. */
1384 phdr->p_type = PT_NOTE;
1385 phdr->p_offset = noteoff;
1386 phdr->p_vaddr = 0;
1387 phdr->p_paddr = 0;
1388 phdr->p_filesz = notesz;
1389 phdr->p_memsz = 0;
1390 phdr->p_flags = 0;
1391 phdr->p_align = 0;
1392 ++phdr;
1393
1394 /* All the writable segments from the program. */
1395 phc.phdr = phdr;
1396 phc.phdr_max = phdr + numsegs;
1397 phc.offset = target->off;
1398 each_segment(p, cb_put_phdr, &phc, 1);
1399 }
1400 return (error);
1401 }
1402
1403 /*
1404 * Append core dump notes to target ELF buffer or simply update target size
1405 * if dryrun selected.
1406 */
1407 static int
1408 elf_putallnotes(struct lwp *corelp, elf_buf_t target, int sig,
1409 enum putmode mode)
1410 {
1411 struct proc *p = corelp->lwp_proc;
1412 int error;
1413 struct {
1414 prstatus_t status;
1415 prfpregset_t fpregs;
1416 prpsinfo_t psinfo;
1417 } *tmpdata;
1418 prstatus_t *status;
1419 prfpregset_t *fpregs;
1420 prpsinfo_t *psinfo;
1421 struct lwp *lp;
1422
1423 /*
1424 * Allocate temporary storage for notes on heap to avoid stack overflow.
1425 */
1426 if (mode != DRYRUN) {
1427 tmpdata = kmalloc(sizeof(*tmpdata), M_TEMP, M_ZERO | M_WAITOK);
1428 status = &tmpdata->status;
1429 fpregs = &tmpdata->fpregs;
1430 psinfo = &tmpdata->psinfo;
1431 } else {
1432 tmpdata = NULL;
1433 status = NULL;
1434 fpregs = NULL;
1435 psinfo = NULL;
1436 }
1437
1438 /*
1439 * Append LWP-agnostic note.
1440 */
1441 if (mode != DRYRUN) {
1442 psinfo->pr_version = PRPSINFO_VERSION;
1443 psinfo->pr_psinfosz = sizeof(prpsinfo_t);
1444 strncpy(psinfo->pr_fname, p->p_comm,
1445 sizeof(psinfo->pr_fname) - 1);
1446 /*
1447 * XXX - We don't fill in the command line arguments
1448 * properly yet.
1449 */
1450 strncpy(psinfo->pr_psargs, p->p_comm, PRARGSZ);
1451 }
1452 error =
1453 elf_putnote(target, "CORE", NT_PRPSINFO, psinfo, sizeof *psinfo);
1454 if (error)
1455 goto exit;
1456
1457 /*
1458 * Append first note for LWP that triggered core so that it is
1459 * the selected one when the debugger starts.
1460 */
1461 if (mode != DRYRUN) {
1462 status->pr_version = PRSTATUS_VERSION;
1463 status->pr_statussz = sizeof(prstatus_t);
1464 status->pr_gregsetsz = sizeof(gregset_t);
1465 status->pr_fpregsetsz = sizeof(fpregset_t);
1466 status->pr_osreldate = osreldate;
1467 status->pr_cursig = sig;
1468 /*
1469 * XXX GDB needs unique pr_pid for each LWP and does not
1470 * not support pr_pid==0 but lwp_tid can be 0, so hack unique
1471 * value.
1472 */
1473 status->pr_pid = corelp->lwp_tid;
1474 fill_regs(corelp, &status->pr_reg);
1475 fill_fpregs(corelp, fpregs);
1476 }
1477 error =
1478 elf_putnote(target, "CORE", NT_PRSTATUS, status, sizeof *status);
1479 if (error)
1480 goto exit;
1481 error =
1482 elf_putnote(target, "CORE", NT_FPREGSET, fpregs, sizeof *fpregs);
1483 if (error)
1484 goto exit;
1485
1486 /*
1487 * Then append notes for other LWPs.
1488 */
1489 FOREACH_LWP_IN_PROC(lp, p) {
1490 if (lp == corelp)
1491 continue;
1492 /* skip lwps being created */
1493 if (lp->lwp_thread == NULL)
1494 continue;
1495 if (mode != DRYRUN) {
1496 status->pr_pid = lp->lwp_tid;
1497 fill_regs(lp, &status->pr_reg);
1498 fill_fpregs(lp, fpregs);
1499 }
1500 error = elf_putnote(target, "CORE", NT_PRSTATUS,
1501 status, sizeof *status);
1502 if (error)
1503 goto exit;
1504 error = elf_putnote(target, "CORE", NT_FPREGSET,
1505 fpregs, sizeof *fpregs);
1506 if (error)
1507 goto exit;
1508 }
1509
1510 exit:
1511 if (tmpdata != NULL)
1512 kfree(tmpdata, M_TEMP);
1513 return (error);
1514 }
1515
1516 /*
1517 * Generate a note sub-structure.
1518 *
1519 * NOTE: 4-byte alignment.
1520 */
1521 static int
1522 elf_putnote(elf_buf_t target, const char *name, int type,
1523 const void *desc, size_t descsz)
1524 {
1525 int error = 0;
1526 char *dst;
1527 Elf_Note note;
1528
1529 note.n_namesz = strlen(name) + 1;
1530 note.n_descsz = descsz;
1531 note.n_type = type;
1532 dst = target_reserve(target, sizeof(note), &error);
1533 if (dst != NULL)
1534 bcopy(&note, dst, sizeof note);
1535 dst = target_reserve(target, note.n_namesz, &error);
1536 if (dst != NULL)
1537 bcopy(name, dst, note.n_namesz);
1538 target->off = roundup2(target->off, sizeof(Elf_Word));
1539 dst = target_reserve(target, note.n_descsz, &error);
1540 if (dst != NULL)
1541 bcopy(desc, dst, note.n_descsz);
1542 target->off = roundup2(target->off, sizeof(Elf_Word));
1543 return(error);
1544 }
1545
1546
1547 static int
1548 elf_putsigs(struct lwp *lp, elf_buf_t target)
1549 {
1550 /* XXX lwp handle more than one lwp */
1551 struct proc *p = lp->lwp_proc;
1552 int error = 0;
1553 struct ckpt_siginfo *csi;
1554
1555 csi = target_reserve(target, sizeof(struct ckpt_siginfo), &error);
1556 if (csi) {
1557 csi->csi_ckptpisz = sizeof(struct ckpt_siginfo);
1558 bcopy(p->p_sigacts, &csi->csi_sigacts, sizeof(*p->p_sigacts));
1559 bcopy(&p->p_realtimer, &csi->csi_itimerval, sizeof(struct itimerval));
1560 bcopy(&lp->lwp_sigmask, &csi->csi_sigmask,
1561 sizeof(sigset_t));
1562 csi->csi_sigparent = p->p_sigparent;
1563 }
1564 return(error);
1565 }
1566
1567 static int
1568 elf_putfiles(struct proc *p, elf_buf_t target, struct file *ckfp)
1569 {
1570 int error = 0;
1571 int i;
1572 struct ckpt_filehdr *cfh = NULL;
1573 struct ckpt_fileinfo *cfi;
1574 struct file *fp;
1575 struct vnode *vp;
1576 /*
1577 * the duplicated loop is gross, but it was the only way
1578 * to eliminate uninitialized variable warnings
1579 */
1580 cfh = target_reserve(target, sizeof(struct ckpt_filehdr), &error);
1581 if (cfh) {
1582 cfh->cfh_nfiles = 0;
1583 }
1584
1585 /*
1586 * ignore STDIN/STDERR/STDOUT.
1587 */
1588 for (i = 3; error == 0 && i < p->p_fd->fd_nfiles; i++) {
1589 fp = holdfp(p->p_fd, i, -1);
1590 if (fp == NULL)
1591 continue;
1592 /*
1593 * XXX Only checkpoint vnodes for now.
1594 */
1595 if (fp->f_type != DTYPE_VNODE) {
1596 fdrop(fp);
1597 continue;
1598 }
1599 cfi = target_reserve(target, sizeof(struct ckpt_fileinfo),
1600 &error);
1601 if (cfi == NULL) {
1602 fdrop(fp);
1603 continue;
1604 }
1605 cfi->cfi_index = -1;
1606 cfi->cfi_type = fp->f_type;
1607 cfi->cfi_flags = fp->f_flag;
1608 cfi->cfi_offset = fp->f_offset;
1609 cfi->cfi_ckflags = 0;
1610
1611 if (fp == ckfp)
1612 cfi->cfi_ckflags |= CKFIF_ISCKPTFD;
1613 /* f_count and f_msgcount should not be saved/restored */
1614 /* XXX save cred info */
1615
1616 switch(fp->f_type) {
1617 case DTYPE_VNODE:
1618 vp = (struct vnode *)fp->f_data;
1619 /*
1620 * it looks like a bug in ptrace is marking
1621 * a non-vnode as a vnode - until we find the
1622 * root cause this will at least prevent
1623 * further panics from truss
1624 */
1625 if (vp == NULL || vp->v_mount == NULL)
1626 break;
1627 cfh->cfh_nfiles++;
1628 cfi->cfi_index = i;
1629 cfi->cfi_fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
1630 error = VFS_VPTOFH(vp, &cfi->cfi_fh.fh_fid);
1631 break;
1632 default:
1633 break;
1634 }
1635 fdrop(fp);
1636 }
1637 return(error);
1638 }
1639
1640 static int
1641 elf_puttextvp(struct proc *p, elf_buf_t target)
1642 {
1643 int error = 0;
1644 int *vn_count;
1645 struct fp_closure fpc;
1646 struct ckpt_vminfo *vminfo;
1647
1648 vminfo = target_reserve(target, sizeof(struct ckpt_vminfo), &error);
1649 if (vminfo != NULL) {
1650 vminfo->cvm_dsize = p->p_vmspace->vm_dsize;
1651 vminfo->cvm_tsize = p->p_vmspace->vm_tsize;
1652 vminfo->cvm_daddr = p->p_vmspace->vm_daddr;
1653 vminfo->cvm_taddr = p->p_vmspace->vm_taddr;
1654 }
1655
1656 fpc.count = 0;
1657 vn_count = target_reserve(target, sizeof(int), &error);
1658 if (target->buf != NULL) {
1659 fpc.vnh = (struct vn_hdr *)(target->buf + target->off);
1660 fpc.vnh_max = fpc.vnh +
1661 (target->off_max - target->off) / sizeof(struct vn_hdr);
1662 error = each_segment(p, cb_put_fp, &fpc, 0);
1663 if (vn_count)
1664 *vn_count = fpc.count;
1665 } else {
1666 error = each_segment(p, cb_fpcount_segment, &fpc.count, 0);
1667 }
1668 target->off += fpc.count * sizeof(struct vn_hdr);
1669 return(error);
1670 }
1671
1672
1673 /*
1674 * Tell kern_execve.c about it, with a little help from the linker.
1675 */
1676 static struct execsw elf_execsw = {exec_elf_imgact, "ELF"};
1677 EXEC_SET_ORDERED(elf, elf_execsw, SI_ORDER_FIRST);
DragonFly BSD