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_capsicum.h"
35 #include "opt_compat.h"
36 #include "opt_gzio.h"
37
38 #include <sys/param.h>
39 #include <sys/capsicum.h>
40 #include <sys/exec.h>
41 #include <sys/fcntl.h>
42 #include <sys/gzio.h>
43 #include <sys/imgact.h>
44 #include <sys/imgact_elf.h>
45 #include <sys/jail.h>
46 #include <sys/kernel.h>
47 #include <sys/lock.h>
48 #include <sys/malloc.h>
49 #include <sys/mount.h>
50 #include <sys/mman.h>
51 #include <sys/namei.h>
52 #include <sys/pioctl.h>
53 #include <sys/proc.h>
54 #include <sys/procfs.h>
55 #include <sys/racct.h>
56 #include <sys/resourcevar.h>
57 #include <sys/rwlock.h>
58 #include <sys/sbuf.h>
59 #include <sys/sf_buf.h>
60 #include <sys/smp.h>
61 #include <sys/systm.h>
62 #include <sys/signalvar.h>
63 #include <sys/stat.h>
64 #include <sys/sx.h>
65 #include <sys/syscall.h>
66 #include <sys/sysctl.h>
67 #include <sys/sysent.h>
68 #include <sys/vnode.h>
69 #include <sys/syslog.h>
70 #include <sys/eventhandler.h>
71 #include <sys/user.h>
72
73 #include <vm/vm.h>
74 #include <vm/vm_kern.h>
75 #include <vm/vm_param.h>
76 #include <vm/pmap.h>
77 #include <vm/vm_map.h>
78 #include <vm/vm_object.h>
79 #include <vm/vm_extern.h>
80
81 #include <machine/elf.h>
82 #include <machine/md_var.h>
83 #ifdef __arm__
84 #include <machine/acle-compat.h>
85 #endif
86
87 #define ELF_NOTE_ROUNDSIZE 4
88 #define OLD_EI_BRAND 8
89
90 static int __elfN(check_header)(const Elf_Ehdr *hdr);
91 static Elf_Brandinfo *__elfN(get_brandinfo)(struct image_params *imgp,
92 const char *interp, int interp_name_len, int32_t *osrel);
93 static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
94 u_long *entry, size_t pagesize);
95 static int __elfN(load_section)(struct image_params *imgp, vm_offset_t offset,
96 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot,
97 size_t pagesize);
98 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp);
99 static boolean_t __elfN(freebsd_trans_osrel)(const Elf_Note *note,
100 int32_t *osrel);
101 static boolean_t kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel);
102 static boolean_t __elfN(check_note)(struct image_params *imgp,
103 Elf_Brandnote *checknote, int32_t *osrel);
104 static vm_prot_t __elfN(trans_prot)(Elf_Word);
105 static Elf_Word __elfN(untrans_prot)(vm_prot_t);
106
107 SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0,
108 "");
109
110 #define CORE_BUF_SIZE (16 * 1024)
111
112 int __elfN(fallback_brand) = -1;
113 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
114 fallback_brand, CTLFLAG_RWTUN, &__elfN(fallback_brand), 0,
115 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort");
116
117 static int elf_legacy_coredump = 0;
118 SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW,
119 &elf_legacy_coredump, 0, "");
120
121 int __elfN(nxstack) =
122 #if defined(__amd64__) || defined(__powerpc64__) /* both 64 and 32 bit */ || \
123 (defined(__arm__) && __ARM_ARCH >= 7) || defined(__aarch64__)
124 1;
125 #else
126 0;
127 #endif
128 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
129 nxstack, CTLFLAG_RW, &__elfN(nxstack), 0,
130 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable non-executable stack");
131
132 #if __ELF_WORD_SIZE == 32
133 #if defined(__amd64__)
134 int i386_read_exec = 0;
135 SYSCTL_INT(_kern_elf32, OID_AUTO, read_exec, CTLFLAG_RW, &i386_read_exec, 0,
136 "enable execution from readable segments");
137 #endif
138 #endif
139
140 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS];
141
142 #define trunc_page_ps(va, ps) ((va) & ~(ps - 1))
143 #define round_page_ps(va, ps) (((va) + (ps - 1)) & ~(ps - 1))
144 #define aligned(a, t) (trunc_page_ps((u_long)(a), sizeof(t)) == (u_long)(a))
145
146 static const char FREEBSD_ABI_VENDOR[] = "FreeBSD";
147
148 Elf_Brandnote __elfN(freebsd_brandnote) = {
149 .hdr.n_namesz = sizeof(FREEBSD_ABI_VENDOR),
150 .hdr.n_descsz = sizeof(int32_t),
151 .hdr.n_type = NT_FREEBSD_ABI_TAG,
152 .vendor = FREEBSD_ABI_VENDOR,
153 .flags = BN_TRANSLATE_OSREL,
154 .trans_osrel = __elfN(freebsd_trans_osrel)
155 };
156
157 static boolean_t
__elfN(freebsd_trans_osrel)158 __elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel)
159 {
160 uintptr_t p;
161
162 p = (uintptr_t)(note + 1);
163 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
164 *osrel = *(const int32_t *)(p);
165
166 return (TRUE);
167 }
168
169 static const char GNU_ABI_VENDOR[] = "GNU";
170 static int GNU_KFREEBSD_ABI_DESC = 3;
171
172 Elf_Brandnote __elfN(kfreebsd_brandnote) = {
173 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR),
174 .hdr.n_descsz = 16, /* XXX at least 16 */
175 .hdr.n_type = 1,
176 .vendor = GNU_ABI_VENDOR,
177 .flags = BN_TRANSLATE_OSREL,
178 .trans_osrel = kfreebsd_trans_osrel
179 };
180
181 static boolean_t
kfreebsd_trans_osrel(const Elf_Note * note,int32_t * osrel)182 kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel)
183 {
184 const Elf32_Word *desc;
185 uintptr_t p;
186
187 p = (uintptr_t)(note + 1);
188 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
189
190 desc = (const Elf32_Word *)p;
191 if (desc[0] != GNU_KFREEBSD_ABI_DESC)
192 return (FALSE);
193
194 /*
195 * Debian GNU/kFreeBSD embed the earliest compatible kernel version
196 * (__FreeBSD_version: <major><two digit minor>Rxx) in the LSB way.
197 */
198 *osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3];
199
200 return (TRUE);
201 }
202
203 int
__elfN(insert_brand_entry)204 __elfN(insert_brand_entry)(Elf_Brandinfo *entry)
205 {
206 int i;
207
208 for (i = 0; i < MAX_BRANDS; i++) {
209 if (elf_brand_list[i] == NULL) {
210 elf_brand_list[i] = entry;
211 break;
212 }
213 }
214 if (i == MAX_BRANDS) {
215 printf("WARNING: %s: could not insert brandinfo entry: %p\n",
216 __func__, entry);
217 return (-1);
218 }
219 return (0);
220 }
221
222 int
__elfN(remove_brand_entry)223 __elfN(remove_brand_entry)(Elf_Brandinfo *entry)
224 {
225 int i;
226
227 for (i = 0; i < MAX_BRANDS; i++) {
228 if (elf_brand_list[i] == entry) {
229 elf_brand_list[i] = NULL;
230 break;
231 }
232 }
233 if (i == MAX_BRANDS)
234 return (-1);
235 return (0);
236 }
237
238 int
__elfN(brand_inuse)239 __elfN(brand_inuse)(Elf_Brandinfo *entry)
240 {
241 struct proc *p;
242 int rval = FALSE;
243
244 sx_slock(&allproc_lock);
245 FOREACH_PROC_IN_SYSTEM(p) {
246 if (p->p_sysent == entry->sysvec) {
247 rval = TRUE;
248 break;
249 }
250 }
251 sx_sunlock(&allproc_lock);
252
253 return (rval);
254 }
255
256 static Elf_Brandinfo *
__elfN(get_brandinfo)257 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp,
258 int interp_name_len, int32_t *osrel)
259 {
260 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
261 Elf_Brandinfo *bi;
262 boolean_t ret;
263 int i;
264
265 /*
266 * We support four types of branding -- (1) the ELF EI_OSABI field
267 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string
268 * branding w/in the ELF header, (3) path of the `interp_path'
269 * field, and (4) the ".note.ABI-tag" ELF section.
270 */
271
272 /* Look for an ".note.ABI-tag" ELF section */
273 for (i = 0; i < MAX_BRANDS; i++) {
274 bi = elf_brand_list[i];
275 if (bi == NULL)
276 continue;
277 if (hdr->e_machine == bi->machine && (bi->flags &
278 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) {
279 ret = __elfN(check_note)(imgp, bi->brand_note, osrel);
280 /* Give brand a chance to veto check_note's guess */
281 if (ret && bi->header_supported)
282 ret = bi->header_supported(imgp);
283 if (ret)
284 return (bi);
285 }
286 }
287
288 /* If the executable has a brand, search for it in the brand list. */
289 for (i = 0; i < MAX_BRANDS; i++) {
290 bi = elf_brand_list[i];
291 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
292 continue;
293 if (hdr->e_machine == bi->machine &&
294 (hdr->e_ident[EI_OSABI] == bi->brand ||
295 strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND],
296 bi->compat_3_brand, strlen(bi->compat_3_brand)) == 0)) {
297 /* Looks good, but give brand a chance to veto */
298 if (!bi->header_supported || bi->header_supported(imgp))
299 return (bi);
300 }
301 }
302
303 /* No known brand, see if the header is recognized by any brand */
304 for (i = 0; i < MAX_BRANDS; i++) {
305 bi = elf_brand_list[i];
306 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY ||
307 bi->header_supported == NULL)
308 continue;
309 if (hdr->e_machine == bi->machine) {
310 ret = bi->header_supported(imgp);
311 if (ret)
312 return (bi);
313 }
314 }
315
316 /* Lacking a known brand, search for a recognized interpreter. */
317 if (interp != NULL) {
318 for (i = 0; i < MAX_BRANDS; i++) {
319 bi = elf_brand_list[i];
320 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
321 continue;
322 if (hdr->e_machine == bi->machine &&
323 /* ELF image p_filesz includes terminating zero */
324 strlen(bi->interp_path) + 1 == interp_name_len &&
325 strncmp(interp, bi->interp_path, interp_name_len)
326 == 0)
327 return (bi);
328 }
329 }
330
331 /* Lacking a recognized interpreter, try the default brand */
332 for (i = 0; i < MAX_BRANDS; i++) {
333 bi = elf_brand_list[i];
334 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
335 continue;
336 if (hdr->e_machine == bi->machine &&
337 __elfN(fallback_brand) == bi->brand)
338 return (bi);
339 }
340 return (NULL);
341 }
342
343 static int
__elfN(check_header)344 __elfN(check_header)(const Elf_Ehdr *hdr)
345 {
346 Elf_Brandinfo *bi;
347 int i;
348
349 if (!IS_ELF(*hdr) ||
350 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
351 hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
352 hdr->e_ident[EI_VERSION] != EV_CURRENT ||
353 hdr->e_phentsize != sizeof(Elf_Phdr) ||
354 hdr->e_version != ELF_TARG_VER)
355 return (ENOEXEC);
356
357 /*
358 * Make sure we have at least one brand for this machine.
359 */
360
361 for (i = 0; i < MAX_BRANDS; i++) {
362 bi = elf_brand_list[i];
363 if (bi != NULL && bi->machine == hdr->e_machine)
364 break;
365 }
366 if (i == MAX_BRANDS)
367 return (ENOEXEC);
368
369 return (0);
370 }
371
372 static int
__elfN(map_partial)373 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
374 vm_offset_t start, vm_offset_t end, vm_prot_t prot)
375 {
376 struct sf_buf *sf;
377 int error;
378 vm_offset_t off;
379
380 /*
381 * Create the page if it doesn't exist yet. Ignore errors.
382 */
383 vm_map_lock(map);
384 vm_map_insert(map, NULL, 0, trunc_page(start), round_page(end),
385 VM_PROT_ALL, VM_PROT_ALL, 0);
386 vm_map_unlock(map);
387
388 /*
389 * Find the page from the underlying object.
390 */
391 if (object) {
392 sf = vm_imgact_map_page(object, offset);
393 if (sf == NULL)
394 return (KERN_FAILURE);
395 off = offset - trunc_page(offset);
396 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start,
397 end - start);
398 vm_imgact_unmap_page(sf);
399 if (error) {
400 return (KERN_FAILURE);
401 }
402 }
403
404 return (KERN_SUCCESS);
405 }
406
407 static int
__elfN(map_insert)408 __elfN(map_insert)(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
409 vm_offset_t start, vm_offset_t end, vm_prot_t prot, int cow)
410 {
411 struct sf_buf *sf;
412 vm_offset_t off;
413 vm_size_t sz;
414 int error, rv;
415
416 if (start != trunc_page(start)) {
417 rv = __elfN(map_partial)(map, object, offset, start,
418 round_page(start), prot);
419 if (rv)
420 return (rv);
421 offset += round_page(start) - start;
422 start = round_page(start);
423 }
424 if (end != round_page(end)) {
425 rv = __elfN(map_partial)(map, object, offset +
426 trunc_page(end) - start, trunc_page(end), end, prot);
427 if (rv)
428 return (rv);
429 end = trunc_page(end);
430 }
431 if (end > start) {
432 if (offset & PAGE_MASK) {
433 /*
434 * The mapping is not page aligned. This means we have
435 * to copy the data. Sigh.
436 */
437 rv = vm_map_find(map, NULL, 0, &start, end - start, 0,
438 VMFS_NO_SPACE, prot | VM_PROT_WRITE, VM_PROT_ALL,
439 0);
440 if (rv)
441 return (rv);
442 if (object == NULL)
443 return (KERN_SUCCESS);
444 for (; start < end; start += sz) {
445 sf = vm_imgact_map_page(object, offset);
446 if (sf == NULL)
447 return (KERN_FAILURE);
448 off = offset - trunc_page(offset);
449 sz = end - start;
450 if (sz > PAGE_SIZE - off)
451 sz = PAGE_SIZE - off;
452 error = copyout((caddr_t)sf_buf_kva(sf) + off,
453 (caddr_t)start, sz);
454 vm_imgact_unmap_page(sf);
455 if (error) {
456 return (KERN_FAILURE);
457 }
458 offset += sz;
459 }
460 rv = KERN_SUCCESS;
461 } else {
462 vm_object_reference(object);
463 vm_map_lock(map);
464 rv = vm_map_insert(map, object, offset, start, end,
465 prot, VM_PROT_ALL, cow);
466 vm_map_unlock(map);
467 if (rv != KERN_SUCCESS)
468 vm_object_deallocate(object);
469 }
470 return (rv);
471 } else {
472 return (KERN_SUCCESS);
473 }
474 }
475
476 static int
__elfN(load_section)477 __elfN(load_section)(struct image_params *imgp, vm_offset_t offset,
478 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot,
479 size_t pagesize)
480 {
481 struct sf_buf *sf;
482 size_t map_len;
483 vm_map_t map;
484 vm_object_t object;
485 vm_offset_t map_addr;
486 int error, rv, cow;
487 size_t copy_len;
488 vm_offset_t file_addr;
489
490 /*
491 * It's necessary to fail if the filsz + offset taken from the
492 * header is greater than the actual file pager object's size.
493 * If we were to allow this, then the vm_map_find() below would
494 * walk right off the end of the file object and into the ether.
495 *
496 * While I'm here, might as well check for something else that
497 * is invalid: filsz cannot be greater than memsz.
498 */
499 if ((off_t)filsz + offset > imgp->attr->va_size || filsz > memsz) {
500 uprintf("elf_load_section: truncated ELF file\n");
501 return (ENOEXEC);
502 }
503
504 object = imgp->object;
505 map = &imgp->proc->p_vmspace->vm_map;
506 map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize);
507 file_addr = trunc_page_ps(offset, pagesize);
508
509 /*
510 * We have two choices. We can either clear the data in the last page
511 * of an oversized mapping, or we can start the anon mapping a page
512 * early and copy the initialized data into that first page. We
513 * choose the second..
514 */
515 if (memsz > filsz)
516 map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr;
517 else
518 map_len = round_page_ps(offset + filsz, pagesize) - file_addr;
519
520 if (map_len != 0) {
521 /* cow flags: don't dump readonly sections in core */
522 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT |
523 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP);
524
525 rv = __elfN(map_insert)(map,
526 object,
527 file_addr, /* file offset */
528 map_addr, /* virtual start */
529 map_addr + map_len,/* virtual end */
530 prot,
531 cow);
532 if (rv != KERN_SUCCESS)
533 return (EINVAL);
534
535 /* we can stop now if we've covered it all */
536 if (memsz == filsz) {
537 return (0);
538 }
539 }
540
541
542 /*
543 * We have to get the remaining bit of the file into the first part
544 * of the oversized map segment. This is normally because the .data
545 * segment in the file is extended to provide bss. It's a neat idea
546 * to try and save a page, but it's a pain in the behind to implement.
547 */
548 copy_len = (offset + filsz) - trunc_page_ps(offset + filsz, pagesize);
549 map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize);
550 map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) -
551 map_addr;
552
553 /* This had damn well better be true! */
554 if (map_len != 0) {
555 rv = __elfN(map_insert)(map, NULL, 0, map_addr, map_addr +
556 map_len, VM_PROT_ALL, 0);
557 if (rv != KERN_SUCCESS) {
558 return (EINVAL);
559 }
560 }
561
562 if (copy_len != 0) {
563 vm_offset_t off;
564
565 sf = vm_imgact_map_page(object, offset + filsz);
566 if (sf == NULL)
567 return (EIO);
568
569 /* send the page fragment to user space */
570 off = trunc_page_ps(offset + filsz, pagesize) -
571 trunc_page(offset + filsz);
572 error = copyout((caddr_t)sf_buf_kva(sf) + off,
573 (caddr_t)map_addr, copy_len);
574 vm_imgact_unmap_page(sf);
575 if (error) {
576 return (error);
577 }
578 }
579
580 /*
581 * set it to the specified protection.
582 * XXX had better undo the damage from pasting over the cracks here!
583 */
584 vm_map_protect(map, trunc_page(map_addr), round_page(map_addr +
585 map_len), prot, FALSE);
586
587 return (0);
588 }
589
590 /*
591 * Load the file "file" into memory. It may be either a shared object
592 * or an executable.
593 *
594 * The "addr" reference parameter is in/out. On entry, it specifies
595 * the address where a shared object should be loaded. If the file is
596 * an executable, this value is ignored. On exit, "addr" specifies
597 * where the file was actually loaded.
598 *
599 * The "entry" reference parameter is out only. On exit, it specifies
600 * the entry point for the loaded file.
601 */
602 static int
__elfN(load_file)603 __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
604 u_long *entry, size_t pagesize)
605 {
606 struct {
607 struct nameidata nd;
608 struct vattr attr;
609 struct image_params image_params;
610 } *tempdata;
611 const Elf_Ehdr *hdr = NULL;
612 const Elf_Phdr *phdr = NULL;
613 struct nameidata *nd;
614 struct vattr *attr;
615 struct image_params *imgp;
616 vm_prot_t prot;
617 u_long rbase;
618 u_long base_addr = 0;
619 int error, i, numsegs;
620
621 #ifdef CAPABILITY_MODE
622 /*
623 * XXXJA: This check can go away once we are sufficiently confident
624 * that the checks in namei() are correct.
625 */
626 if (IN_CAPABILITY_MODE(curthread))
627 return (ECAPMODE);
628 #endif
629
630 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK);
631 nd = &tempdata->nd;
632 attr = &tempdata->attr;
633 imgp = &tempdata->image_params;
634
635 /*
636 * Initialize part of the common data
637 */
638 imgp->proc = p;
639 imgp->attr = attr;
640 imgp->firstpage = NULL;
641 imgp->image_header = NULL;
642 imgp->object = NULL;
643 imgp->execlabel = NULL;
644
645 NDINIT(nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_SYSSPACE, file, curthread);
646 if ((error = namei(nd)) != 0) {
647 nd->ni_vp = NULL;
648 goto fail;
649 }
650 NDFREE(nd, NDF_ONLY_PNBUF);
651 imgp->vp = nd->ni_vp;
652
653 /*
654 * Check permissions, modes, uid, etc on the file, and "open" it.
655 */
656 error = exec_check_permissions(imgp);
657 if (error)
658 goto fail;
659
660 error = exec_map_first_page(imgp);
661 if (error)
662 goto fail;
663
664 /*
665 * Also make certain that the interpreter stays the same, so set
666 * its VV_TEXT flag, too.
667 */
668 VOP_SET_TEXT(nd->ni_vp);
669
670 imgp->object = nd->ni_vp->v_object;
671
672 hdr = (const Elf_Ehdr *)imgp->image_header;
673 if ((error = __elfN(check_header)(hdr)) != 0)
674 goto fail;
675 if (hdr->e_type == ET_DYN)
676 rbase = *addr;
677 else if (hdr->e_type == ET_EXEC)
678 rbase = 0;
679 else {
680 error = ENOEXEC;
681 goto fail;
682 }
683
684 /* Only support headers that fit within first page for now */
685 if ((hdr->e_phoff > PAGE_SIZE) ||
686 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) {
687 error = ENOEXEC;
688 goto fail;
689 }
690
691 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
692 if (!aligned(phdr, Elf_Addr)) {
693 error = ENOEXEC;
694 goto fail;
695 }
696
697 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) {
698 if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) {
699 /* Loadable segment */
700 prot = __elfN(trans_prot)(phdr[i].p_flags);
701 error = __elfN(load_section)(imgp, phdr[i].p_offset,
702 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase,
703 phdr[i].p_memsz, phdr[i].p_filesz, prot, pagesize);
704 if (error != 0)
705 goto fail;
706 /*
707 * Establish the base address if this is the
708 * first segment.
709 */
710 if (numsegs == 0)
711 base_addr = trunc_page(phdr[i].p_vaddr +
712 rbase);
713 numsegs++;
714 }
715 }
716 *addr = base_addr;
717 *entry = (unsigned long)hdr->e_entry + rbase;
718
719 fail:
720 if (imgp->firstpage)
721 exec_unmap_first_page(imgp);
722
723 if (nd->ni_vp)
724 vput(nd->ni_vp);
725
726 free(tempdata, M_TEMP);
727
728 return (error);
729 }
730
731 static int
__CONCAT(exec_,__elfN (imgact))732 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp)
733 {
734 struct thread *td;
735 const Elf_Ehdr *hdr;
736 const Elf_Phdr *phdr;
737 Elf_Auxargs *elf_auxargs;
738 struct vmspace *vmspace;
739 const char *err_str, *newinterp;
740 char *interp, *interp_buf, *path;
741 Elf_Brandinfo *brand_info;
742 struct sysentvec *sv;
743 vm_prot_t prot;
744 u_long text_size, data_size, total_size, text_addr, data_addr;
745 u_long seg_size, seg_addr, addr, baddr, et_dyn_addr, entry, proghdr;
746 int32_t osrel;
747 int error, i, n, interp_name_len, have_interp;
748
749 hdr = (const Elf_Ehdr *)imgp->image_header;
750
751 /*
752 * Do we have a valid ELF header ?
753 *
754 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later
755 * if particular brand doesn't support it.
756 */
757 if (__elfN(check_header)(hdr) != 0 ||
758 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN))
759 return (-1);
760
761 /*
762 * From here on down, we return an errno, not -1, as we've
763 * detected an ELF file.
764 */
765
766 if ((hdr->e_phoff > PAGE_SIZE) ||
767 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) {
768 /* Only support headers in first page for now */
769 uprintf("Program headers not in the first page\n");
770 return (ENOEXEC);
771 }
772 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
773 if (!aligned(phdr, Elf_Addr)) {
774 uprintf("Unaligned program headers\n");
775 return (ENOEXEC);
776 }
777
778 n = error = 0;
779 baddr = 0;
780 osrel = 0;
781 text_size = data_size = total_size = text_addr = data_addr = 0;
782 entry = proghdr = 0;
783 interp_name_len = 0;
784 err_str = newinterp = NULL;
785 interp = interp_buf = NULL;
786 td = curthread;
787
788 for (i = 0; i < hdr->e_phnum; i++) {
789 switch (phdr[i].p_type) {
790 case PT_LOAD:
791 if (n == 0)
792 baddr = phdr[i].p_vaddr;
793 n++;
794 break;
795 case PT_INTERP:
796 /* Path to interpreter */
797 if (phdr[i].p_filesz > MAXPATHLEN) {
798 uprintf("Invalid PT_INTERP\n");
799 error = ENOEXEC;
800 goto ret;
801 }
802 if (interp != NULL) {
803 uprintf("Multiple PT_INTERP headers\n");
804 error = ENOEXEC;
805 goto ret;
806 }
807 interp_name_len = phdr[i].p_filesz;
808 if (phdr[i].p_offset > PAGE_SIZE ||
809 interp_name_len > PAGE_SIZE - phdr[i].p_offset) {
810 VOP_UNLOCK(imgp->vp, 0);
811 interp_buf = malloc(interp_name_len + 1, M_TEMP,
812 M_WAITOK);
813 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
814 error = vn_rdwr(UIO_READ, imgp->vp, interp_buf,
815 interp_name_len, phdr[i].p_offset,
816 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
817 NOCRED, NULL, td);
818 if (error != 0) {
819 uprintf("i/o error PT_INTERP\n");
820 goto ret;
821 }
822 interp_buf[interp_name_len] = '\0';
823 interp = interp_buf;
824 } else {
825 interp = __DECONST(char *, imgp->image_header) +
826 phdr[i].p_offset;
827 }
828 break;
829 case PT_GNU_STACK:
830 if (__elfN(nxstack))
831 imgp->stack_prot =
832 __elfN(trans_prot)(phdr[i].p_flags);
833 imgp->stack_sz = phdr[i].p_memsz;
834 break;
835 }
836 }
837
838 brand_info = __elfN(get_brandinfo)(imgp, interp, interp_name_len,
839 &osrel);
840 if (brand_info == NULL) {
841 uprintf("ELF binary type \"%u\" not known.\n",
842 hdr->e_ident[EI_OSABI]);
843 error = ENOEXEC;
844 goto ret;
845 }
846 if (hdr->e_type == ET_DYN) {
847 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) {
848 uprintf("Cannot execute shared object\n");
849 error = ENOEXEC;
850 goto ret;
851 }
852 /*
853 * Honour the base load address from the dso if it is
854 * non-zero for some reason.
855 */
856 if (baddr == 0)
857 et_dyn_addr = ET_DYN_LOAD_ADDR;
858 else
859 et_dyn_addr = 0;
860 } else
861 et_dyn_addr = 0;
862 sv = brand_info->sysvec;
863 if (interp != NULL && brand_info->interp_newpath != NULL)
864 newinterp = brand_info->interp_newpath;
865
866 /*
867 * Avoid a possible deadlock if the current address space is destroyed
868 * and that address space maps the locked vnode. In the common case,
869 * the locked vnode's v_usecount is decremented but remains greater
870 * than zero. Consequently, the vnode lock is not needed by vrele().
871 * However, in cases where the vnode lock is external, such as nullfs,
872 * v_usecount may become zero.
873 *
874 * The VV_TEXT flag prevents modifications to the executable while
875 * the vnode is unlocked.
876 */
877 VOP_UNLOCK(imgp->vp, 0);
878
879 error = exec_new_vmspace(imgp, sv);
880 imgp->proc->p_sysent = sv;
881
882 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
883 if (error != 0)
884 goto ret;
885
886 for (i = 0; i < hdr->e_phnum; i++) {
887 switch (phdr[i].p_type) {
888 case PT_LOAD: /* Loadable segment */
889 if (phdr[i].p_memsz == 0)
890 break;
891 prot = __elfN(trans_prot)(phdr[i].p_flags);
892 error = __elfN(load_section)(imgp, phdr[i].p_offset,
893 (caddr_t)(uintptr_t)phdr[i].p_vaddr + et_dyn_addr,
894 phdr[i].p_memsz, phdr[i].p_filesz, prot,
895 sv->sv_pagesize);
896 if (error != 0)
897 goto ret;
898
899 /*
900 * If this segment contains the program headers,
901 * remember their virtual address for the AT_PHDR
902 * aux entry. Static binaries don't usually include
903 * a PT_PHDR entry.
904 */
905 if (phdr[i].p_offset == 0 &&
906 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize
907 <= phdr[i].p_filesz)
908 proghdr = phdr[i].p_vaddr + hdr->e_phoff +
909 et_dyn_addr;
910
911 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr);
912 seg_size = round_page(phdr[i].p_memsz +
913 phdr[i].p_vaddr + et_dyn_addr - seg_addr);
914
915 /*
916 * Make the largest executable segment the official
917 * text segment and all others data.
918 *
919 * Note that obreak() assumes that data_addr +
920 * data_size == end of data load area, and the ELF
921 * file format expects segments to be sorted by
922 * address. If multiple data segments exist, the
923 * last one will be used.
924 */
925
926 if (phdr[i].p_flags & PF_X && text_size < seg_size) {
927 text_size = seg_size;
928 text_addr = seg_addr;
929 } else {
930 data_size = seg_size;
931 data_addr = seg_addr;
932 }
933 total_size += seg_size;
934 break;
935 case PT_PHDR: /* Program header table info */
936 proghdr = phdr[i].p_vaddr + et_dyn_addr;
937 break;
938 default:
939 break;
940 }
941 }
942
943 if (data_addr == 0 && data_size == 0) {
944 data_addr = text_addr;
945 data_size = text_size;
946 }
947
948 entry = (u_long)hdr->e_entry + et_dyn_addr;
949
950 /*
951 * Check limits. It should be safe to check the
952 * limits after loading the segments since we do
953 * not actually fault in all the segments pages.
954 */
955 PROC_LOCK(imgp->proc);
956 if (data_size > lim_cur_proc(imgp->proc, RLIMIT_DATA))
957 err_str = "Data segment size exceeds process limit";
958 else if (text_size > maxtsiz)
959 err_str = "Text segment size exceeds system limit";
960 else if (total_size > lim_cur_proc(imgp->proc, RLIMIT_VMEM))
961 err_str = "Total segment size exceeds process limit";
962 else if (racct_set(imgp->proc, RACCT_DATA, data_size) != 0)
963 err_str = "Data segment size exceeds resource limit";
964 else if (racct_set(imgp->proc, RACCT_VMEM, total_size) != 0)
965 err_str = "Total segment size exceeds resource limit";
966 if (err_str != NULL) {
967 PROC_UNLOCK(imgp->proc);
968 uprintf("%s\n", err_str);
969 error = ENOMEM;
970 goto ret;
971 }
972
973 vmspace = imgp->proc->p_vmspace;
974 vmspace->vm_tsize = text_size >> PAGE_SHIFT;
975 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr;
976 vmspace->vm_dsize = data_size >> PAGE_SHIFT;
977 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr;
978
979 /*
980 * We load the dynamic linker where a userland call
981 * to mmap(0, ...) would put it. The rationale behind this
982 * calculation is that it leaves room for the heap to grow to
983 * its maximum allowed size.
984 */
985 addr = round_page((vm_offset_t)vmspace->vm_daddr + lim_max(td,
986 RLIMIT_DATA));
987 PROC_UNLOCK(imgp->proc);
988
989 imgp->entry_addr = entry;
990
991 if (interp != NULL) {
992 have_interp = FALSE;
993 VOP_UNLOCK(imgp->vp, 0);
994 if (brand_info->emul_path != NULL &&
995 brand_info->emul_path[0] != '\0') {
996 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
997 snprintf(path, MAXPATHLEN, "%s%s",
998 brand_info->emul_path, interp);
999 error = __elfN(load_file)(imgp->proc, path, &addr,
1000 &imgp->entry_addr, sv->sv_pagesize);
1001 free(path, M_TEMP);
1002 if (error == 0)
1003 have_interp = TRUE;
1004 }
1005 if (!have_interp && newinterp != NULL &&
1006 (brand_info->interp_path == NULL ||
1007 strcmp(interp, brand_info->interp_path) == 0)) {
1008 error = __elfN(load_file)(imgp->proc, newinterp, &addr,
1009 &imgp->entry_addr, sv->sv_pagesize);
1010 if (error == 0)
1011 have_interp = TRUE;
1012 }
1013 if (!have_interp) {
1014 error = __elfN(load_file)(imgp->proc, interp, &addr,
1015 &imgp->entry_addr, sv->sv_pagesize);
1016 }
1017 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
1018 if (error != 0) {
1019 uprintf("ELF interpreter %s not found, error %d\n",
1020 interp, error);
1021 goto ret;
1022 }
1023 } else
1024 addr = et_dyn_addr;
1025
1026 /*
1027 * Construct auxargs table (used by the fixup routine)
1028 */
1029 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK);
1030 elf_auxargs->execfd = -1;
1031 elf_auxargs->phdr = proghdr;
1032 elf_auxargs->phent = hdr->e_phentsize;
1033 elf_auxargs->phnum = hdr->e_phnum;
1034 elf_auxargs->pagesz = PAGE_SIZE;
1035 elf_auxargs->base = addr;
1036 elf_auxargs->flags = 0;
1037 elf_auxargs->entry = entry;
1038 elf_auxargs->hdr_eflags = hdr->e_flags;
1039
1040 imgp->auxargs = elf_auxargs;
1041 imgp->interpreted = 0;
1042 imgp->reloc_base = addr;
1043 imgp->proc->p_osrel = osrel;
1044
1045 ret:
1046 free(interp_buf, M_TEMP);
1047 return (error);
1048 }
1049
1050 #define suword __CONCAT(suword, __ELF_WORD_SIZE)
1051
1052 int
__elfN(freebsd_fixup)1053 __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp)
1054 {
1055 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs;
1056 Elf_Addr *base;
1057 Elf_Addr *pos;
1058
1059 base = (Elf_Addr *)*stack_base;
1060 pos = base + (imgp->args->argc + imgp->args->envc + 2);
1061
1062 if (args->execfd != -1)
1063 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
1064 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
1065 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
1066 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
1067 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
1068 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
1069 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
1070 AUXARGS_ENTRY(pos, AT_BASE, args->base);
1071 #ifdef AT_EHDRFLAGS
1072 AUXARGS_ENTRY(pos, AT_EHDRFLAGS, args->hdr_eflags);
1073 #endif
1074 if (imgp->execpathp != 0)
1075 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp);
1076 AUXARGS_ENTRY(pos, AT_OSRELDATE,
1077 imgp->proc->p_ucred->cr_prison->pr_osreldate);
1078 if (imgp->canary != 0) {
1079 AUXARGS_ENTRY(pos, AT_CANARY, imgp->canary);
1080 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen);
1081 }
1082 AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus);
1083 if (imgp->pagesizes != 0) {
1084 AUXARGS_ENTRY(pos, AT_PAGESIZES, imgp->pagesizes);
1085 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen);
1086 }
1087 if (imgp->sysent->sv_timekeep_base != 0) {
1088 AUXARGS_ENTRY(pos, AT_TIMEKEEP,
1089 imgp->sysent->sv_timekeep_base);
1090 }
1091 AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj
1092 != NULL && imgp->stack_prot != 0 ? imgp->stack_prot :
1093 imgp->sysent->sv_stackprot);
1094 AUXARGS_ENTRY(pos, AT_NULL, 0);
1095
1096 free(imgp->auxargs, M_TEMP);
1097 imgp->auxargs = NULL;
1098
1099 base--;
1100 suword(base, (long)imgp->args->argc);
1101 *stack_base = (register_t *)base;
1102 return (0);
1103 }
1104
1105 /*
1106 * Code for generating ELF core dumps.
1107 */
1108
1109 typedef void (*segment_callback)(vm_map_entry_t, void *);
1110
1111 /* Closure for cb_put_phdr(). */
1112 struct phdr_closure {
1113 Elf_Phdr *phdr; /* Program header to fill in */
1114 Elf_Off offset; /* Offset of segment in core file */
1115 };
1116
1117 /* Closure for cb_size_segment(). */
1118 struct sseg_closure {
1119 int count; /* Count of writable segments. */
1120 size_t size; /* Total size of all writable segments. */
1121 };
1122
1123 typedef void (*outfunc_t)(void *, struct sbuf *, size_t *);
1124
1125 struct note_info {
1126 int type; /* Note type. */
1127 outfunc_t outfunc; /* Output function. */
1128 void *outarg; /* Argument for the output function. */
1129 size_t outsize; /* Output size. */
1130 TAILQ_ENTRY(note_info) link; /* Link to the next note info. */
1131 };
1132
1133 TAILQ_HEAD(note_info_list, note_info);
1134
1135 /* Coredump output parameters. */
1136 struct coredump_params {
1137 off_t offset;
1138 struct ucred *active_cred;
1139 struct ucred *file_cred;
1140 struct thread *td;
1141 struct vnode *vp;
1142 struct gzio_stream *gzs;
1143 };
1144
1145 static void cb_put_phdr(vm_map_entry_t, void *);
1146 static void cb_size_segment(vm_map_entry_t, void *);
1147 static int core_write(struct coredump_params *, void *, size_t, off_t,
1148 enum uio_seg);
1149 static void each_writable_segment(struct thread *, segment_callback, void *);
1150 static int __elfN(corehdr)(struct coredump_params *, int, void *, size_t,
1151 struct note_info_list *, size_t);
1152 static void __elfN(prepare_notes)(struct thread *, struct note_info_list *,
1153 size_t *);
1154 static void __elfN(puthdr)(struct thread *, void *, size_t, int, size_t);
1155 static void __elfN(putnote)(struct note_info *, struct sbuf *);
1156 static size_t register_note(struct note_info_list *, int, outfunc_t, void *);
1157 static int sbuf_drain_core_output(void *, const char *, int);
1158 static int sbuf_drain_count(void *arg, const char *data, int len);
1159
1160 static void __elfN(note_fpregset)(void *, struct sbuf *, size_t *);
1161 static void __elfN(note_prpsinfo)(void *, struct sbuf *, size_t *);
1162 static void __elfN(note_prstatus)(void *, struct sbuf *, size_t *);
1163 static void __elfN(note_threadmd)(void *, struct sbuf *, size_t *);
1164 static void __elfN(note_thrmisc)(void *, struct sbuf *, size_t *);
1165 static void __elfN(note_procstat_auxv)(void *, struct sbuf *, size_t *);
1166 static void __elfN(note_procstat_proc)(void *, struct sbuf *, size_t *);
1167 static void __elfN(note_procstat_psstrings)(void *, struct sbuf *, size_t *);
1168 static void note_procstat_files(void *, struct sbuf *, size_t *);
1169 static void note_procstat_groups(void *, struct sbuf *, size_t *);
1170 static void note_procstat_osrel(void *, struct sbuf *, size_t *);
1171 static void note_procstat_rlimit(void *, struct sbuf *, size_t *);
1172 static void note_procstat_umask(void *, struct sbuf *, size_t *);
1173 static void note_procstat_vmmap(void *, struct sbuf *, size_t *);
1174
1175 #ifdef GZIO
1176 extern int compress_user_cores_gzlevel;
1177
1178 /*
1179 * Write out a core segment to the compression stream.
1180 */
1181 static int
compress_chunk(struct coredump_params * p,char * base,char * buf,u_int len)1182 compress_chunk(struct coredump_params *p, char *base, char *buf, u_int len)
1183 {
1184 u_int chunk_len;
1185 int error;
1186
1187 while (len > 0) {
1188 chunk_len = MIN(len, CORE_BUF_SIZE);
1189 copyin(base, buf, chunk_len);
1190 error = gzio_write(p->gzs, buf, chunk_len);
1191 if (error != 0)
1192 break;
1193 base += chunk_len;
1194 len -= chunk_len;
1195 }
1196 return (error);
1197 }
1198
1199 static int
core_gz_write(void * base,size_t len,off_t offset,void * arg)1200 core_gz_write(void *base, size_t len, off_t offset, void *arg)
1201 {
1202
1203 return (core_write((struct coredump_params *)arg, base, len, offset,
1204 UIO_SYSSPACE));
1205 }
1206 #endif /* GZIO */
1207
1208 static int
core_write(struct coredump_params * p,void * base,size_t len,off_t offset,enum uio_seg seg)1209 core_write(struct coredump_params *p, void *base, size_t len, off_t offset,
1210 enum uio_seg seg)
1211 {
1212
1213 return (vn_rdwr_inchunks(UIO_WRITE, p->vp, base, len, offset,
1214 seg, IO_UNIT | IO_DIRECT | IO_RANGELOCKED,
1215 p->active_cred, p->file_cred, NULL, p->td));
1216 }
1217
1218 static int
core_output(void * base,size_t len,off_t offset,struct coredump_params * p,void * tmpbuf)1219 core_output(void *base, size_t len, off_t offset, struct coredump_params *p,
1220 void *tmpbuf)
1221 {
1222
1223 #ifdef GZIO
1224 if (p->gzs != NULL)
1225 return (compress_chunk(p, base, tmpbuf, len));
1226 #endif
1227 return (core_write(p, base, len, offset, UIO_USERSPACE));
1228 }
1229
1230 /*
1231 * Drain into a core file.
1232 */
1233 static int
sbuf_drain_core_output(void * arg,const char * data,int len)1234 sbuf_drain_core_output(void *arg, const char *data, int len)
1235 {
1236 struct coredump_params *p;
1237 int error, locked;
1238
1239 p = (struct coredump_params *)arg;
1240
1241 /*
1242 * Some kern_proc out routines that print to this sbuf may
1243 * call us with the process lock held. Draining with the
1244 * non-sleepable lock held is unsafe. The lock is needed for
1245 * those routines when dumping a live process. In our case we
1246 * can safely release the lock before draining and acquire
1247 * again after.
1248 */
1249 locked = PROC_LOCKED(p->td->td_proc);
1250 if (locked)
1251 PROC_UNLOCK(p->td->td_proc);
1252 #ifdef GZIO
1253 if (p->gzs != NULL)
1254 error = gzio_write(p->gzs, __DECONST(char *, data), len);
1255 else
1256 #endif
1257 error = core_write(p, __DECONST(void *, data), len, p->offset,
1258 UIO_SYSSPACE);
1259 if (locked)
1260 PROC_LOCK(p->td->td_proc);
1261 if (error != 0)
1262 return (-error);
1263 p->offset += len;
1264 return (len);
1265 }
1266
1267 /*
1268 * Drain into a counter.
1269 */
1270 static int
sbuf_drain_count(void * arg,const char * data __unused,int len)1271 sbuf_drain_count(void *arg, const char *data __unused, int len)
1272 {
1273 size_t *sizep;
1274
1275 sizep = (size_t *)arg;
1276 *sizep += len;
1277 return (len);
1278 }
1279
1280 int
__elfN(coredump)1281 __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags)
1282 {
1283 struct ucred *cred = td->td_ucred;
1284 int error = 0;
1285 struct sseg_closure seginfo;
1286 struct note_info_list notelst;
1287 struct coredump_params params;
1288 struct note_info *ninfo;
1289 void *hdr, *tmpbuf;
1290 size_t hdrsize, notesz, coresize;
1291 #ifdef GZIO
1292 boolean_t compress;
1293
1294 compress = (flags & IMGACT_CORE_COMPRESS) != 0;
1295 #endif
1296 hdr = NULL;
1297 tmpbuf = NULL;
1298 TAILQ_INIT(¬elst);
1299
1300 /* Size the program segments. */
1301 seginfo.count = 0;
1302 seginfo.size = 0;
1303 each_writable_segment(td, cb_size_segment, &seginfo);
1304
1305 /*
1306 * Collect info about the core file header area.
1307 */
1308 hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count);
1309 __elfN(prepare_notes)(td, ¬elst, ¬esz);
1310 coresize = round_page(hdrsize + notesz) + seginfo.size;
1311
1312 /* Set up core dump parameters. */
1313 params.offset = 0;
1314 params.active_cred = cred;
1315 params.file_cred = NOCRED;
1316 params.td = td;
1317 params.vp = vp;
1318 params.gzs = NULL;
1319
1320 #ifdef RACCT
1321 if (racct_enable) {
1322 PROC_LOCK(td->td_proc);
1323 error = racct_add(td->td_proc, RACCT_CORE, coresize);
1324 PROC_UNLOCK(td->td_proc);
1325 if (error != 0) {
1326 error = EFAULT;
1327 goto done;
1328 }
1329 }
1330 #endif
1331 if (coresize >= limit) {
1332 error = EFAULT;
1333 goto done;
1334 }
1335
1336 #ifdef GZIO
1337 /* Create a compression stream if necessary. */
1338 if (compress) {
1339 params.gzs = gzio_init(core_gz_write, GZIO_DEFLATE,
1340 CORE_BUF_SIZE, compress_user_cores_gzlevel, ¶ms);
1341 if (params.gzs == NULL) {
1342 error = EFAULT;
1343 goto done;
1344 }
1345 tmpbuf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO);
1346 }
1347 #endif
1348
1349 /*
1350 * Allocate memory for building the header, fill it up,
1351 * and write it out following the notes.
1352 */
1353 hdr = malloc(hdrsize, M_TEMP, M_WAITOK);
1354 if (hdr == NULL) {
1355 error = EINVAL;
1356 goto done;
1357 }
1358 error = __elfN(corehdr)(¶ms, seginfo.count, hdr, hdrsize, ¬elst,
1359 notesz);
1360
1361 /* Write the contents of all of the writable segments. */
1362 if (error == 0) {
1363 Elf_Phdr *php;
1364 off_t offset;
1365 int i;
1366
1367 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1;
1368 offset = round_page(hdrsize + notesz);
1369 for (i = 0; i < seginfo.count; i++) {
1370 error = core_output((caddr_t)(uintptr_t)php->p_vaddr,
1371 php->p_filesz, offset, ¶ms, tmpbuf);
1372 if (error != 0)
1373 break;
1374 offset += php->p_filesz;
1375 php++;
1376 }
1377 #ifdef GZIO
1378 if (error == 0 && compress)
1379 error = gzio_flush(params.gzs);
1380 #endif
1381 }
1382 if (error) {
1383 log(LOG_WARNING,
1384 "Failed to write core file for process %s (error %d)\n",
1385 curproc->p_comm, error);
1386 }
1387
1388 done:
1389 #ifdef GZIO
1390 if (compress) {
1391 free(tmpbuf, M_TEMP);
1392 if (params.gzs != NULL)
1393 gzio_fini(params.gzs);
1394 }
1395 #endif
1396 while ((ninfo = TAILQ_FIRST(¬elst)) != NULL) {
1397 TAILQ_REMOVE(¬elst, ninfo, link);
1398 free(ninfo, M_TEMP);
1399 }
1400 if (hdr != NULL)
1401 free(hdr, M_TEMP);
1402
1403 return (error);
1404 }
1405
1406 /*
1407 * A callback for each_writable_segment() to write out the segment's
1408 * program header entry.
1409 */
1410 static void
cb_put_phdr(entry,closure)1411 cb_put_phdr(entry, closure)
1412 vm_map_entry_t entry;
1413 void *closure;
1414 {
1415 struct phdr_closure *phc = (struct phdr_closure *)closure;
1416 Elf_Phdr *phdr = phc->phdr;
1417
1418 phc->offset = round_page(phc->offset);
1419
1420 phdr->p_type = PT_LOAD;
1421 phdr->p_offset = phc->offset;
1422 phdr->p_vaddr = entry->start;
1423 phdr->p_paddr = 0;
1424 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
1425 phdr->p_align = PAGE_SIZE;
1426 phdr->p_flags = __elfN(untrans_prot)(entry->protection);
1427
1428 phc->offset += phdr->p_filesz;
1429 phc->phdr++;
1430 }
1431
1432 /*
1433 * A callback for each_writable_segment() to gather information about
1434 * the number of segments and their total size.
1435 */
1436 static void
cb_size_segment(entry,closure)1437 cb_size_segment(entry, closure)
1438 vm_map_entry_t entry;
1439 void *closure;
1440 {
1441 struct sseg_closure *ssc = (struct sseg_closure *)closure;
1442
1443 ssc->count++;
1444 ssc->size += entry->end - entry->start;
1445 }
1446
1447 /*
1448 * For each writable segment in the process's memory map, call the given
1449 * function with a pointer to the map entry and some arbitrary
1450 * caller-supplied data.
1451 */
1452 static void
each_writable_segment(td,func,closure)1453 each_writable_segment(td, func, closure)
1454 struct thread *td;
1455 segment_callback func;
1456 void *closure;
1457 {
1458 struct proc *p = td->td_proc;
1459 vm_map_t map = &p->p_vmspace->vm_map;
1460 vm_map_entry_t entry;
1461 vm_object_t backing_object, object;
1462 boolean_t ignore_entry;
1463
1464 vm_map_lock_read(map);
1465 for (entry = map->header.next; entry != &map->header;
1466 entry = entry->next) {
1467 /*
1468 * Don't dump inaccessible mappings, deal with legacy
1469 * coredump mode.
1470 *
1471 * Note that read-only segments related to the elf binary
1472 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer
1473 * need to arbitrarily ignore such segments.
1474 */
1475 if (elf_legacy_coredump) {
1476 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW)
1477 continue;
1478 } else {
1479 if ((entry->protection & VM_PROT_ALL) == 0)
1480 continue;
1481 }
1482
1483 /*
1484 * Dont include memory segment in the coredump if
1485 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in
1486 * madvise(2). Do not dump submaps (i.e. parts of the
1487 * kernel map).
1488 */
1489 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP))
1490 continue;
1491
1492 if ((object = entry->object.vm_object) == NULL)
1493 continue;
1494
1495 /* Ignore memory-mapped devices and such things. */
1496 VM_OBJECT_RLOCK(object);
1497 while ((backing_object = object->backing_object) != NULL) {
1498 VM_OBJECT_RLOCK(backing_object);
1499 VM_OBJECT_RUNLOCK(object);
1500 object = backing_object;
1501 }
1502 ignore_entry = object->type != OBJT_DEFAULT &&
1503 object->type != OBJT_SWAP && object->type != OBJT_VNODE &&
1504 object->type != OBJT_PHYS;
1505 VM_OBJECT_RUNLOCK(object);
1506 if (ignore_entry)
1507 continue;
1508
1509 (*func)(entry, closure);
1510 }
1511 vm_map_unlock_read(map);
1512 }
1513
1514 /*
1515 * Write the core file header to the file, including padding up to
1516 * the page boundary.
1517 */
1518 static int
__elfN(corehdr)1519 __elfN(corehdr)(struct coredump_params *p, int numsegs, void *hdr,
1520 size_t hdrsize, struct note_info_list *notelst, size_t notesz)
1521 {
1522 struct note_info *ninfo;
1523 struct sbuf *sb;
1524 int error;
1525
1526 /* Fill in the header. */
1527 bzero(hdr, hdrsize);
1528 __elfN(puthdr)(p->td, hdr, hdrsize, numsegs, notesz);
1529
1530 sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN);
1531 sbuf_set_drain(sb, sbuf_drain_core_output, p);
1532 sbuf_start_section(sb, NULL);
1533 sbuf_bcat(sb, hdr, hdrsize);
1534 TAILQ_FOREACH(ninfo, notelst, link)
1535 __elfN(putnote)(ninfo, sb);
1536 /* Align up to a page boundary for the program segments. */
1537 sbuf_end_section(sb, -1, PAGE_SIZE, 0);
1538 error = sbuf_finish(sb);
1539 sbuf_delete(sb);
1540
1541 return (error);
1542 }
1543
1544 static void
__elfN(prepare_notes)1545 __elfN(prepare_notes)(struct thread *td, struct note_info_list *list,
1546 size_t *sizep)
1547 {
1548 struct proc *p;
1549 struct thread *thr;
1550 size_t size;
1551
1552 p = td->td_proc;
1553 size = 0;
1554
1555 size += register_note(list, NT_PRPSINFO, __elfN(note_prpsinfo), p);
1556
1557 /*
1558 * To have the debugger select the right thread (LWP) as the initial
1559 * thread, we dump the state of the thread passed to us in td first.
1560 * This is the thread that causes the core dump and thus likely to
1561 * be the right thread one wants to have selected in the debugger.
1562 */
1563 thr = td;
1564 while (thr != NULL) {
1565 size += register_note(list, NT_PRSTATUS,
1566 __elfN(note_prstatus), thr);
1567 size += register_note(list, NT_FPREGSET,
1568 __elfN(note_fpregset), thr);
1569 size += register_note(list, NT_THRMISC,
1570 __elfN(note_thrmisc), thr);
1571 size += register_note(list, -1,
1572 __elfN(note_threadmd), thr);
1573
1574 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) :
1575 TAILQ_NEXT(thr, td_plist);
1576 if (thr == td)
1577 thr = TAILQ_NEXT(thr, td_plist);
1578 }
1579
1580 size += register_note(list, NT_PROCSTAT_PROC,
1581 __elfN(note_procstat_proc), p);
1582 size += register_note(list, NT_PROCSTAT_FILES,
1583 note_procstat_files, p);
1584 size += register_note(list, NT_PROCSTAT_VMMAP,
1585 note_procstat_vmmap, p);
1586 size += register_note(list, NT_PROCSTAT_GROUPS,
1587 note_procstat_groups, p);
1588 size += register_note(list, NT_PROCSTAT_UMASK,
1589 note_procstat_umask, p);
1590 size += register_note(list, NT_PROCSTAT_RLIMIT,
1591 note_procstat_rlimit, p);
1592 size += register_note(list, NT_PROCSTAT_OSREL,
1593 note_procstat_osrel, p);
1594 size += register_note(list, NT_PROCSTAT_PSSTRINGS,
1595 __elfN(note_procstat_psstrings), p);
1596 size += register_note(list, NT_PROCSTAT_AUXV,
1597 __elfN(note_procstat_auxv), p);
1598
1599 *sizep = size;
1600 }
1601
1602 static void
__elfN(puthdr)1603 __elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs,
1604 size_t notesz)
1605 {
1606 Elf_Ehdr *ehdr;
1607 Elf_Phdr *phdr;
1608 struct phdr_closure phc;
1609
1610 ehdr = (Elf_Ehdr *)hdr;
1611 phdr = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr));
1612
1613 ehdr->e_ident[EI_MAG0] = ELFMAG0;
1614 ehdr->e_ident[EI_MAG1] = ELFMAG1;
1615 ehdr->e_ident[EI_MAG2] = ELFMAG2;
1616 ehdr->e_ident[EI_MAG3] = ELFMAG3;
1617 ehdr->e_ident[EI_CLASS] = ELF_CLASS;
1618 ehdr->e_ident[EI_DATA] = ELF_DATA;
1619 ehdr->e_ident[EI_VERSION] = EV_CURRENT;
1620 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
1621 ehdr->e_ident[EI_ABIVERSION] = 0;
1622 ehdr->e_ident[EI_PAD] = 0;
1623 ehdr->e_type = ET_CORE;
1624 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
1625 ehdr->e_machine = ELF_ARCH32;
1626 #else
1627 ehdr->e_machine = ELF_ARCH;
1628 #endif
1629 ehdr->e_version = EV_CURRENT;
1630 ehdr->e_entry = 0;
1631 ehdr->e_phoff = sizeof(Elf_Ehdr);
1632 ehdr->e_flags = 0;
1633 ehdr->e_ehsize = sizeof(Elf_Ehdr);
1634 ehdr->e_phentsize = sizeof(Elf_Phdr);
1635 ehdr->e_phnum = numsegs + 1;
1636 ehdr->e_shentsize = sizeof(Elf_Shdr);
1637 ehdr->e_shnum = 0;
1638 ehdr->e_shstrndx = SHN_UNDEF;
1639
1640 /*
1641 * Fill in the program header entries.
1642 */
1643
1644 /* The note segement. */
1645 phdr->p_type = PT_NOTE;
1646 phdr->p_offset = hdrsize;
1647 phdr->p_vaddr = 0;
1648 phdr->p_paddr = 0;
1649 phdr->p_filesz = notesz;
1650 phdr->p_memsz = 0;
1651 phdr->p_flags = PF_R;
1652 phdr->p_align = ELF_NOTE_ROUNDSIZE;
1653 phdr++;
1654
1655 /* All the writable segments from the program. */
1656 phc.phdr = phdr;
1657 phc.offset = round_page(hdrsize + notesz);
1658 each_writable_segment(td, cb_put_phdr, &phc);
1659 }
1660
1661 static size_t
register_note(struct note_info_list * list,int type,outfunc_t out,void * arg)1662 register_note(struct note_info_list *list, int type, outfunc_t out, void *arg)
1663 {
1664 struct note_info *ninfo;
1665 size_t size, notesize;
1666
1667 size = 0;
1668 out(arg, NULL, &size);
1669 ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK);
1670 ninfo->type = type;
1671 ninfo->outfunc = out;
1672 ninfo->outarg = arg;
1673 ninfo->outsize = size;
1674 TAILQ_INSERT_TAIL(list, ninfo, link);
1675
1676 if (type == -1)
1677 return (size);
1678
1679 notesize = sizeof(Elf_Note) + /* note header */
1680 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) +
1681 /* note name */
1682 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */
1683
1684 return (notesize);
1685 }
1686
1687 static size_t
append_note_data(const void * src,void * dst,size_t len)1688 append_note_data(const void *src, void *dst, size_t len)
1689 {
1690 size_t padded_len;
1691
1692 padded_len = roundup2(len, ELF_NOTE_ROUNDSIZE);
1693 if (dst != NULL) {
1694 bcopy(src, dst, len);
1695 bzero((char *)dst + len, padded_len - len);
1696 }
1697 return (padded_len);
1698 }
1699
1700 size_t
__elfN(populate_note)1701 __elfN(populate_note)(int type, void *src, void *dst, size_t size, void **descp)
1702 {
1703 Elf_Note *note;
1704 char *buf;
1705 size_t notesize;
1706
1707 buf = dst;
1708 if (buf != NULL) {
1709 note = (Elf_Note *)buf;
1710 note->n_namesz = sizeof(FREEBSD_ABI_VENDOR);
1711 note->n_descsz = size;
1712 note->n_type = type;
1713 buf += sizeof(*note);
1714 buf += append_note_data(FREEBSD_ABI_VENDOR, buf,
1715 sizeof(FREEBSD_ABI_VENDOR));
1716 append_note_data(src, buf, size);
1717 if (descp != NULL)
1718 *descp = buf;
1719 }
1720
1721 notesize = sizeof(Elf_Note) + /* note header */
1722 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) +
1723 /* note name */
1724 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */
1725
1726 return (notesize);
1727 }
1728
1729 static void
__elfN(putnote)1730 __elfN(putnote)(struct note_info *ninfo, struct sbuf *sb)
1731 {
1732 Elf_Note note;
1733 ssize_t old_len, sect_len;
1734 size_t new_len, descsz, i;
1735
1736 if (ninfo->type == -1) {
1737 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize);
1738 return;
1739 }
1740
1741 note.n_namesz = sizeof(FREEBSD_ABI_VENDOR);
1742 note.n_descsz = ninfo->outsize;
1743 note.n_type = ninfo->type;
1744
1745 sbuf_bcat(sb, ¬e, sizeof(note));
1746 sbuf_start_section(sb, &old_len);
1747 sbuf_bcat(sb, FREEBSD_ABI_VENDOR, sizeof(FREEBSD_ABI_VENDOR));
1748 sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0);
1749 if (note.n_descsz == 0)
1750 return;
1751 sbuf_start_section(sb, &old_len);
1752 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize);
1753 sect_len = sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0);
1754 if (sect_len < 0)
1755 return;
1756
1757 new_len = (size_t)sect_len;
1758 descsz = roundup(note.n_descsz, ELF_NOTE_ROUNDSIZE);
1759 if (new_len < descsz) {
1760 /*
1761 * It is expected that individual note emitters will correctly
1762 * predict their expected output size and fill up to that size
1763 * themselves, padding in a format-specific way if needed.
1764 * However, in case they don't, just do it here with zeros.
1765 */
1766 for (i = 0; i < descsz - new_len; i++)
1767 sbuf_putc(sb, 0);
1768 } else if (new_len > descsz) {
1769 /*
1770 * We can't always truncate sb -- we may have drained some
1771 * of it already.
1772 */
1773 KASSERT(new_len == descsz, ("%s: Note type %u changed as we "
1774 "read it (%zu > %zu). Since it is longer than "
1775 "expected, this coredump's notes are corrupt. THIS "
1776 "IS A BUG in the note_procstat routine for type %u.\n",
1777 __func__, (unsigned)note.n_type, new_len, descsz,
1778 (unsigned)note.n_type));
1779 }
1780 }
1781
1782 /*
1783 * Miscellaneous note out functions.
1784 */
1785
1786 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
1787 #include <compat/freebsd32/freebsd32.h>
1788
1789 typedef struct prstatus32 elf_prstatus_t;
1790 typedef struct prpsinfo32 elf_prpsinfo_t;
1791 typedef struct fpreg32 elf_prfpregset_t;
1792 typedef struct fpreg32 elf_fpregset_t;
1793 typedef struct reg32 elf_gregset_t;
1794 typedef struct thrmisc32 elf_thrmisc_t;
1795 #define ELF_KERN_PROC_MASK KERN_PROC_MASK32
1796 typedef struct kinfo_proc32 elf_kinfo_proc_t;
1797 typedef uint32_t elf_ps_strings_t;
1798 #else
1799 typedef prstatus_t elf_prstatus_t;
1800 typedef prpsinfo_t elf_prpsinfo_t;
1801 typedef prfpregset_t elf_prfpregset_t;
1802 typedef prfpregset_t elf_fpregset_t;
1803 typedef gregset_t elf_gregset_t;
1804 typedef thrmisc_t elf_thrmisc_t;
1805 #define ELF_KERN_PROC_MASK 0
1806 typedef struct kinfo_proc elf_kinfo_proc_t;
1807 typedef vm_offset_t elf_ps_strings_t;
1808 #endif
1809
1810 static void
__elfN(note_prpsinfo)1811 __elfN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep)
1812 {
1813 struct proc *p;
1814 elf_prpsinfo_t *psinfo;
1815
1816 p = (struct proc *)arg;
1817 if (sb != NULL) {
1818 KASSERT(*sizep == sizeof(*psinfo), ("invalid size"));
1819 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK);
1820 psinfo->pr_version = PRPSINFO_VERSION;
1821 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t);
1822 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname));
1823 /*
1824 * XXX - We don't fill in the command line arguments properly
1825 * yet.
1826 */
1827 strlcpy(psinfo->pr_psargs, p->p_comm,
1828 sizeof(psinfo->pr_psargs));
1829
1830 sbuf_bcat(sb, psinfo, sizeof(*psinfo));
1831 free(psinfo, M_TEMP);
1832 }
1833 *sizep = sizeof(*psinfo);
1834 }
1835
1836 static void
__elfN(note_prstatus)1837 __elfN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep)
1838 {
1839 struct thread *td;
1840 elf_prstatus_t *status;
1841
1842 td = (struct thread *)arg;
1843 if (sb != NULL) {
1844 KASSERT(*sizep == sizeof(*status), ("invalid size"));
1845 status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK);
1846 status->pr_version = PRSTATUS_VERSION;
1847 status->pr_statussz = sizeof(elf_prstatus_t);
1848 status->pr_gregsetsz = sizeof(elf_gregset_t);
1849 status->pr_fpregsetsz = sizeof(elf_fpregset_t);
1850 status->pr_osreldate = osreldate;
1851 status->pr_cursig = td->td_proc->p_sig;
1852 status->pr_pid = td->td_tid;
1853 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
1854 fill_regs32(td, &status->pr_reg);
1855 #else
1856 fill_regs(td, &status->pr_reg);
1857 #endif
1858 sbuf_bcat(sb, status, sizeof(*status));
1859 free(status, M_TEMP);
1860 }
1861 *sizep = sizeof(*status);
1862 }
1863
1864 static void
__elfN(note_fpregset)1865 __elfN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep)
1866 {
1867 struct thread *td;
1868 elf_prfpregset_t *fpregset;
1869
1870 td = (struct thread *)arg;
1871 if (sb != NULL) {
1872 KASSERT(*sizep == sizeof(*fpregset), ("invalid size"));
1873 fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK);
1874 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
1875 fill_fpregs32(td, fpregset);
1876 #else
1877 fill_fpregs(td, fpregset);
1878 #endif
1879 sbuf_bcat(sb, fpregset, sizeof(*fpregset));
1880 free(fpregset, M_TEMP);
1881 }
1882 *sizep = sizeof(*fpregset);
1883 }
1884
1885 static void
__elfN(note_thrmisc)1886 __elfN(note_thrmisc)(void *arg, struct sbuf *sb, size_t *sizep)
1887 {
1888 struct thread *td;
1889 elf_thrmisc_t thrmisc;
1890
1891 td = (struct thread *)arg;
1892 if (sb != NULL) {
1893 KASSERT(*sizep == sizeof(thrmisc), ("invalid size"));
1894 bzero(&thrmisc._pad, sizeof(thrmisc._pad));
1895 strcpy(thrmisc.pr_tname, td->td_name);
1896 sbuf_bcat(sb, &thrmisc, sizeof(thrmisc));
1897 }
1898 *sizep = sizeof(thrmisc);
1899 }
1900
1901 /*
1902 * Allow for MD specific notes, as well as any MD
1903 * specific preparations for writing MI notes.
1904 */
1905 static void
__elfN(note_threadmd)1906 __elfN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep)
1907 {
1908 struct thread *td;
1909 void *buf;
1910 size_t size;
1911
1912 td = (struct thread *)arg;
1913 size = *sizep;
1914 if (size != 0 && sb != NULL)
1915 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK);
1916 else
1917 buf = NULL;
1918 size = 0;
1919 __elfN(dump_thread)(td, buf, &size);
1920 KASSERT(sb == NULL || *sizep == size, ("invalid size"));
1921 if (size != 0 && sb != NULL)
1922 sbuf_bcat(sb, buf, size);
1923 free(buf, M_TEMP);
1924 *sizep = size;
1925 }
1926
1927 #ifdef KINFO_PROC_SIZE
1928 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE);
1929 #endif
1930
1931 static void
__elfN(note_procstat_proc)1932 __elfN(note_procstat_proc)(void *arg, struct sbuf *sb, size_t *sizep)
1933 {
1934 struct proc *p;
1935 size_t size;
1936 int structsize;
1937
1938 p = (struct proc *)arg;
1939 size = sizeof(structsize) + p->p_numthreads *
1940 sizeof(elf_kinfo_proc_t);
1941
1942 if (sb != NULL) {
1943 KASSERT(*sizep == size, ("invalid size"));
1944 structsize = sizeof(elf_kinfo_proc_t);
1945 sbuf_bcat(sb, &structsize, sizeof(structsize));
1946 sx_slock(&proctree_lock);
1947 PROC_LOCK(p);
1948 kern_proc_out(p, sb, ELF_KERN_PROC_MASK);
1949 sx_sunlock(&proctree_lock);
1950 }
1951 *sizep = size;
1952 }
1953
1954 #ifdef KINFO_FILE_SIZE
1955 CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE);
1956 #endif
1957
1958 static void
note_procstat_files(void * arg,struct sbuf * sb,size_t * sizep)1959 note_procstat_files(void *arg, struct sbuf *sb, size_t *sizep)
1960 {
1961 struct proc *p;
1962 size_t size, sect_sz, i;
1963 ssize_t start_len, sect_len;
1964 int structsize, filedesc_flags;
1965
1966 if (coredump_pack_fileinfo)
1967 filedesc_flags = KERN_FILEDESC_PACK_KINFO;
1968 else
1969 filedesc_flags = 0;
1970
1971 p = (struct proc *)arg;
1972 structsize = sizeof(struct kinfo_file);
1973 if (sb == NULL) {
1974 size = 0;
1975 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
1976 sbuf_set_drain(sb, sbuf_drain_count, &size);
1977 sbuf_bcat(sb, &structsize, sizeof(structsize));
1978 PROC_LOCK(p);
1979 kern_proc_filedesc_out(p, sb, -1, filedesc_flags);
1980 sbuf_finish(sb);
1981 sbuf_delete(sb);
1982 *sizep = size;
1983 } else {
1984 sbuf_start_section(sb, &start_len);
1985
1986 sbuf_bcat(sb, &structsize, sizeof(structsize));
1987 PROC_LOCK(p);
1988 kern_proc_filedesc_out(p, sb, *sizep - sizeof(structsize),
1989 filedesc_flags);
1990
1991 sect_len = sbuf_end_section(sb, start_len, 0, 0);
1992 if (sect_len < 0)
1993 return;
1994 sect_sz = sect_len;
1995
1996 KASSERT(sect_sz <= *sizep,
1997 ("kern_proc_filedesc_out did not respect maxlen; "
1998 "requested %zu, got %zu", *sizep - sizeof(structsize),
1999 sect_sz - sizeof(structsize)));
2000
2001 for (i = 0; i < *sizep - sect_sz && sb->s_error == 0; i++)
2002 sbuf_putc(sb, 0);
2003 }
2004 }
2005
2006 #ifdef KINFO_VMENTRY_SIZE
2007 CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE);
2008 #endif
2009
2010 static void
note_procstat_vmmap(void * arg,struct sbuf * sb,size_t * sizep)2011 note_procstat_vmmap(void *arg, struct sbuf *sb, size_t *sizep)
2012 {
2013 struct proc *p;
2014 size_t size;
2015 int structsize, vmmap_flags;
2016
2017 if (coredump_pack_vmmapinfo)
2018 vmmap_flags = KERN_VMMAP_PACK_KINFO;
2019 else
2020 vmmap_flags = 0;
2021
2022 p = (struct proc *)arg;
2023 structsize = sizeof(struct kinfo_vmentry);
2024 if (sb == NULL) {
2025 size = 0;
2026 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
2027 sbuf_set_drain(sb, sbuf_drain_count, &size);
2028 sbuf_bcat(sb, &structsize, sizeof(structsize));
2029 PROC_LOCK(p);
2030 kern_proc_vmmap_out(p, sb, -1, vmmap_flags);
2031 sbuf_finish(sb);
2032 sbuf_delete(sb);
2033 *sizep = size;
2034 } else {
2035 sbuf_bcat(sb, &structsize, sizeof(structsize));
2036 PROC_LOCK(p);
2037 kern_proc_vmmap_out(p, sb, *sizep - sizeof(structsize),
2038 vmmap_flags);
2039 }
2040 }
2041
2042 static void
note_procstat_groups(void * arg,struct sbuf * sb,size_t * sizep)2043 note_procstat_groups(void *arg, struct sbuf *sb, size_t *sizep)
2044 {
2045 struct proc *p;
2046 size_t size;
2047 int structsize;
2048
2049 p = (struct proc *)arg;
2050 size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t);
2051 if (sb != NULL) {
2052 KASSERT(*sizep == size, ("invalid size"));
2053 structsize = sizeof(gid_t);
2054 sbuf_bcat(sb, &structsize, sizeof(structsize));
2055 sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups *
2056 sizeof(gid_t));
2057 }
2058 *sizep = size;
2059 }
2060
2061 static void
note_procstat_umask(void * arg,struct sbuf * sb,size_t * sizep)2062 note_procstat_umask(void *arg, struct sbuf *sb, size_t *sizep)
2063 {
2064 struct proc *p;
2065 size_t size;
2066 int structsize;
2067
2068 p = (struct proc *)arg;
2069 size = sizeof(structsize) + sizeof(p->p_fd->fd_cmask);
2070 if (sb != NULL) {
2071 KASSERT(*sizep == size, ("invalid size"));
2072 structsize = sizeof(p->p_fd->fd_cmask);
2073 sbuf_bcat(sb, &structsize, sizeof(structsize));
2074 sbuf_bcat(sb, &p->p_fd->fd_cmask, sizeof(p->p_fd->fd_cmask));
2075 }
2076 *sizep = size;
2077 }
2078
2079 static void
note_procstat_rlimit(void * arg,struct sbuf * sb,size_t * sizep)2080 note_procstat_rlimit(void *arg, struct sbuf *sb, size_t *sizep)
2081 {
2082 struct proc *p;
2083 struct rlimit rlim[RLIM_NLIMITS];
2084 size_t size;
2085 int structsize, i;
2086
2087 p = (struct proc *)arg;
2088 size = sizeof(structsize) + sizeof(rlim);
2089 if (sb != NULL) {
2090 KASSERT(*sizep == size, ("invalid size"));
2091 structsize = sizeof(rlim);
2092 sbuf_bcat(sb, &structsize, sizeof(structsize));
2093 PROC_LOCK(p);
2094 for (i = 0; i < RLIM_NLIMITS; i++)
2095 lim_rlimit_proc(p, i, &rlim[i]);
2096 PROC_UNLOCK(p);
2097 sbuf_bcat(sb, rlim, sizeof(rlim));
2098 }
2099 *sizep = size;
2100 }
2101
2102 static void
note_procstat_osrel(void * arg,struct sbuf * sb,size_t * sizep)2103 note_procstat_osrel(void *arg, struct sbuf *sb, size_t *sizep)
2104 {
2105 struct proc *p;
2106 size_t size;
2107 int structsize;
2108
2109 p = (struct proc *)arg;
2110 size = sizeof(structsize) + sizeof(p->p_osrel);
2111 if (sb != NULL) {
2112 KASSERT(*sizep == size, ("invalid size"));
2113 structsize = sizeof(p->p_osrel);
2114 sbuf_bcat(sb, &structsize, sizeof(structsize));
2115 sbuf_bcat(sb, &p->p_osrel, sizeof(p->p_osrel));
2116 }
2117 *sizep = size;
2118 }
2119
2120 static void
__elfN(note_procstat_psstrings)2121 __elfN(note_procstat_psstrings)(void *arg, struct sbuf *sb, size_t *sizep)
2122 {
2123 struct proc *p;
2124 elf_ps_strings_t ps_strings;
2125 size_t size;
2126 int structsize;
2127
2128 p = (struct proc *)arg;
2129 size = sizeof(structsize) + sizeof(ps_strings);
2130 if (sb != NULL) {
2131 KASSERT(*sizep == size, ("invalid size"));
2132 structsize = sizeof(ps_strings);
2133 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2134 ps_strings = PTROUT(p->p_sysent->sv_psstrings);
2135 #else
2136 ps_strings = p->p_sysent->sv_psstrings;
2137 #endif
2138 sbuf_bcat(sb, &structsize, sizeof(structsize));
2139 sbuf_bcat(sb, &ps_strings, sizeof(ps_strings));
2140 }
2141 *sizep = size;
2142 }
2143
2144 static void
__elfN(note_procstat_auxv)2145 __elfN(note_procstat_auxv)(void *arg, struct sbuf *sb, size_t *sizep)
2146 {
2147 struct proc *p;
2148 size_t size;
2149 int structsize;
2150
2151 p = (struct proc *)arg;
2152 if (sb == NULL) {
2153 size = 0;
2154 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
2155 sbuf_set_drain(sb, sbuf_drain_count, &size);
2156 sbuf_bcat(sb, &structsize, sizeof(structsize));
2157 PHOLD(p);
2158 proc_getauxv(curthread, p, sb);
2159 PRELE(p);
2160 sbuf_finish(sb);
2161 sbuf_delete(sb);
2162 *sizep = size;
2163 } else {
2164 structsize = sizeof(Elf_Auxinfo);
2165 sbuf_bcat(sb, &structsize, sizeof(structsize));
2166 PHOLD(p);
2167 proc_getauxv(curthread, p, sb);
2168 PRELE(p);
2169 }
2170 }
2171
2172 static boolean_t
__elfN(parse_notes)2173 __elfN(parse_notes)(struct image_params *imgp, Elf_Brandnote *checknote,
2174 int32_t *osrel, const Elf_Phdr *pnote)
2175 {
2176 const Elf_Note *note, *note0, *note_end;
2177 const char *note_name;
2178 char *buf;
2179 int i, error;
2180 boolean_t res;
2181
2182 /* We need some limit, might as well use PAGE_SIZE. */
2183 if (pnote == NULL || pnote->p_filesz > PAGE_SIZE)
2184 return (FALSE);
2185 ASSERT_VOP_LOCKED(imgp->vp, "parse_notes");
2186 if (pnote->p_offset > PAGE_SIZE ||
2187 pnote->p_filesz > PAGE_SIZE - pnote->p_offset) {
2188 VOP_UNLOCK(imgp->vp, 0);
2189 buf = malloc(pnote->p_filesz, M_TEMP, M_WAITOK);
2190 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
2191 error = vn_rdwr(UIO_READ, imgp->vp, buf, pnote->p_filesz,
2192 pnote->p_offset, UIO_SYSSPACE, IO_NODELOCKED,
2193 curthread->td_ucred, NOCRED, NULL, curthread);
2194 if (error != 0) {
2195 uprintf("i/o error PT_NOTE\n");
2196 res = FALSE;
2197 goto ret;
2198 }
2199 note = note0 = (const Elf_Note *)buf;
2200 note_end = (const Elf_Note *)(buf + pnote->p_filesz);
2201 } else {
2202 note = note0 = (const Elf_Note *)(imgp->image_header +
2203 pnote->p_offset);
2204 note_end = (const Elf_Note *)(imgp->image_header +
2205 pnote->p_offset + pnote->p_filesz);
2206 buf = NULL;
2207 }
2208 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) {
2209 if (!aligned(note, Elf32_Addr) || (const char *)note_end -
2210 (const char *)note < sizeof(Elf_Note)) {
2211 res = FALSE;
2212 goto ret;
2213 }
2214 if (note->n_namesz != checknote->hdr.n_namesz ||
2215 note->n_descsz != checknote->hdr.n_descsz ||
2216 note->n_type != checknote->hdr.n_type)
2217 goto nextnote;
2218 note_name = (const char *)(note + 1);
2219 if (note_name + checknote->hdr.n_namesz >=
2220 (const char *)note_end || strncmp(checknote->vendor,
2221 note_name, checknote->hdr.n_namesz) != 0)
2222 goto nextnote;
2223
2224 /*
2225 * Fetch the osreldate for binary
2226 * from the ELF OSABI-note if necessary.
2227 */
2228 if ((checknote->flags & BN_TRANSLATE_OSREL) != 0 &&
2229 checknote->trans_osrel != NULL) {
2230 res = checknote->trans_osrel(note, osrel);
2231 goto ret;
2232 }
2233 res = TRUE;
2234 goto ret;
2235 nextnote:
2236 note = (const Elf_Note *)((const char *)(note + 1) +
2237 roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) +
2238 roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE));
2239 }
2240 res = FALSE;
2241 ret:
2242 free(buf, M_TEMP);
2243 return (res);
2244 }
2245
2246 /*
2247 * Try to find the appropriate ABI-note section for checknote,
2248 * fetch the osreldate for binary from the ELF OSABI-note. Only the
2249 * first page of the image is searched, the same as for headers.
2250 */
2251 static boolean_t
__elfN(check_note)2252 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote,
2253 int32_t *osrel)
2254 {
2255 const Elf_Phdr *phdr;
2256 const Elf_Ehdr *hdr;
2257 int i;
2258
2259 hdr = (const Elf_Ehdr *)imgp->image_header;
2260 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
2261
2262 for (i = 0; i < hdr->e_phnum; i++) {
2263 if (phdr[i].p_type == PT_NOTE &&
2264 __elfN(parse_notes)(imgp, checknote, osrel, &phdr[i]))
2265 return (TRUE);
2266 }
2267 return (FALSE);
2268
2269 }
2270
2271 /*
2272 * Tell kern_execve.c about it, with a little help from the linker.
2273 */
2274 static struct execsw __elfN(execsw) = {
2275 __CONCAT(exec_, __elfN(imgact)),
2276 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
2277 };
2278 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw));
2279
2280 static vm_prot_t
__elfN(trans_prot)2281 __elfN(trans_prot)(Elf_Word flags)
2282 {
2283 vm_prot_t prot;
2284
2285 prot = 0;
2286 if (flags & PF_X)
2287 prot |= VM_PROT_EXECUTE;
2288 if (flags & PF_W)
2289 prot |= VM_PROT_WRITE;
2290 if (flags & PF_R)
2291 prot |= VM_PROT_READ;
2292 #if __ELF_WORD_SIZE == 32
2293 #if defined(__amd64__)
2294 if (i386_read_exec && (flags & PF_R))
2295 prot |= VM_PROT_EXECUTE;
2296 #endif
2297 #endif
2298 return (prot);
2299 }
2300
2301 static Elf_Word
__elfN(untrans_prot)2302 __elfN(untrans_prot)(vm_prot_t prot)
2303 {
2304 Elf_Word flags;
2305
2306 flags = 0;
2307 if (prot & VM_PROT_EXECUTE)
2308 flags |= PF_X;
2309 if (prot & VM_PROT_READ)
2310 flags |= PF_R;
2311 if (prot & VM_PROT_WRITE)
2312 flags |= PF_W;
2313 return (flags);
2314 }
2315