FreeBSD/Linux Kernel Cross Reference
sys/kern/imgact_elf.c
1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 2017 Dell EMC
5 * Copyright (c) 2000-2001, 2003 David O'Brien
6 * Copyright (c) 1995-1996 Søren Schmidt
7 * Copyright (c) 1996 Peter Wemm
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer
15 * in this position and unchanged.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
36
37 #include "opt_capsicum.h"
38
39 #include <sys/param.h>
40 #include <sys/capsicum.h>
41 #include <sys/compressor.h>
42 #include <sys/exec.h>
43 #include <sys/fcntl.h>
44 #include <sys/imgact.h>
45 #include <sys/imgact_elf.h>
46 #include <sys/jail.h>
47 #include <sys/kernel.h>
48 #include <sys/lock.h>
49 #include <sys/malloc.h>
50 #include <sys/mount.h>
51 #include <sys/mman.h>
52 #include <sys/namei.h>
53 #include <sys/proc.h>
54 #include <sys/procfs.h>
55 #include <sys/ptrace.h>
56 #include <sys/racct.h>
57 #include <sys/reg.h>
58 #include <sys/resourcevar.h>
59 #include <sys/rwlock.h>
60 #include <sys/sbuf.h>
61 #include <sys/sf_buf.h>
62 #include <sys/smp.h>
63 #include <sys/systm.h>
64 #include <sys/signalvar.h>
65 #include <sys/stat.h>
66 #include <sys/sx.h>
67 #include <sys/syscall.h>
68 #include <sys/sysctl.h>
69 #include <sys/sysent.h>
70 #include <sys/vnode.h>
71 #include <sys/syslog.h>
72 #include <sys/eventhandler.h>
73 #include <sys/user.h>
74
75 #include <vm/vm.h>
76 #include <vm/vm_kern.h>
77 #include <vm/vm_param.h>
78 #include <vm/pmap.h>
79 #include <vm/vm_map.h>
80 #include <vm/vm_object.h>
81 #include <vm/vm_extern.h>
82
83 #include <machine/elf.h>
84 #include <machine/md_var.h>
85
86 #define ELF_NOTE_ROUNDSIZE 4
87 #define OLD_EI_BRAND 8
88
89 static int __elfN(check_header)(const Elf_Ehdr *hdr);
90 static Elf_Brandinfo *__elfN(get_brandinfo)(struct image_params *imgp,
91 const char *interp, int32_t *osrel, uint32_t *fctl0);
92 static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
93 u_long *entry);
94 static int __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset,
95 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot);
96 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp);
97 static bool __elfN(freebsd_trans_osrel)(const Elf_Note *note,
98 int32_t *osrel);
99 static bool kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel);
100 static bool __elfN(check_note)(struct image_params *imgp,
101 Elf_Brandnote *checknote, int32_t *osrel, bool *has_fctl0,
102 uint32_t *fctl0);
103 static vm_prot_t __elfN(trans_prot)(Elf_Word);
104 static Elf_Word __elfN(untrans_prot)(vm_prot_t);
105 static size_t __elfN(prepare_register_notes)(struct thread *td,
106 struct note_info_list *list, struct thread *target_td);
107
108 SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE),
109 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
110 "");
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 "include all and only RW pages in core dumps");
121
122 int __elfN(nxstack) =
123 #if defined(__amd64__) || defined(__powerpc64__) /* both 64 and 32 bit */ || \
124 (defined(__arm__) && __ARM_ARCH >= 7) || defined(__aarch64__) || \
125 defined(__riscv)
126 1;
127 #else
128 0;
129 #endif
130 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
131 nxstack, CTLFLAG_RW, &__elfN(nxstack), 0,
132 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable non-executable stack");
133
134 #if defined(__amd64__)
135 static int __elfN(vdso) = 1;
136 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
137 vdso, CTLFLAG_RWTUN, &__elfN(vdso), 0,
138 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable vdso preloading");
139 #else
140 static int __elfN(vdso) = 0;
141 #endif
142
143 #if __ELF_WORD_SIZE == 32 && (defined(__amd64__) || defined(__i386__))
144 int i386_read_exec = 0;
145 SYSCTL_INT(_kern_elf32, OID_AUTO, read_exec, CTLFLAG_RW, &i386_read_exec, 0,
146 "enable execution from readable segments");
147 #endif
148
149 static u_long __elfN(pie_base) = ET_DYN_LOAD_ADDR;
150 static int
151 sysctl_pie_base(SYSCTL_HANDLER_ARGS)
152 {
153 u_long val;
154 int error;
155
156 val = __elfN(pie_base);
157 error = sysctl_handle_long(oidp, &val, 0, req);
158 if (error != 0 || req->newptr == NULL)
159 return (error);
160 if ((val & PAGE_MASK) != 0)
161 return (EINVAL);
162 __elfN(pie_base) = val;
163 return (0);
164 }
165 SYSCTL_PROC(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, pie_base,
166 CTLTYPE_ULONG | CTLFLAG_MPSAFE | CTLFLAG_RW, NULL, 0,
167 sysctl_pie_base, "LU",
168 "PIE load base without randomization");
169
170 SYSCTL_NODE(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, aslr,
171 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
172 "");
173 #define ASLR_NODE_OID __CONCAT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), _aslr)
174
175 /*
176 * Enable ASLR by default for 64-bit non-PIE binaries. 32-bit architectures
177 * have limited address space (which can cause issues for applications with
178 * high memory use) so we leave it off there.
179 */
180 static int __elfN(aslr_enabled) = __ELF_WORD_SIZE == 64;
181 SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, enable, CTLFLAG_RWTUN,
182 &__elfN(aslr_enabled), 0,
183 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
184 ": enable address map randomization");
185
186 /*
187 * Enable ASLR by default for 64-bit PIE binaries.
188 */
189 static int __elfN(pie_aslr_enabled) = __ELF_WORD_SIZE == 64;
190 SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, pie_enable, CTLFLAG_RWTUN,
191 &__elfN(pie_aslr_enabled), 0,
192 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
193 ": enable address map randomization for PIE binaries");
194
195 /*
196 * Sbrk is deprecated and it can be assumed that in most cases it will not be
197 * used anyway. This setting is valid only with ASLR enabled, and allows ASLR
198 * to use the bss grow region.
199 */
200 static int __elfN(aslr_honor_sbrk) = 0;
201 SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, honor_sbrk, CTLFLAG_RW,
202 &__elfN(aslr_honor_sbrk), 0,
203 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": assume sbrk is used");
204
205 static int __elfN(aslr_stack) = 1;
206 SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, stack, CTLFLAG_RWTUN,
207 &__elfN(aslr_stack), 0,
208 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
209 ": enable stack address randomization");
210
211 static int __elfN(aslr_shared_page) = __ELF_WORD_SIZE == 64;
212 SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, shared_page, CTLFLAG_RWTUN,
213 &__elfN(aslr_shared_page), 0,
214 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
215 ": enable shared page address randomization");
216
217 static int __elfN(sigfastblock) = 1;
218 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, sigfastblock,
219 CTLFLAG_RWTUN, &__elfN(sigfastblock), 0,
220 "enable sigfastblock for new processes");
221
222 static bool __elfN(allow_wx) = true;
223 SYSCTL_BOOL(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, allow_wx,
224 CTLFLAG_RWTUN, &__elfN(allow_wx), 0,
225 "Allow pages to be mapped simultaneously writable and executable");
226
227 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS];
228
229 #define aligned(a, t) (rounddown2((u_long)(a), sizeof(t)) == (u_long)(a))
230
231 Elf_Brandnote __elfN(freebsd_brandnote) = {
232 .hdr.n_namesz = sizeof(FREEBSD_ABI_VENDOR),
233 .hdr.n_descsz = sizeof(int32_t),
234 .hdr.n_type = NT_FREEBSD_ABI_TAG,
235 .vendor = FREEBSD_ABI_VENDOR,
236 .flags = BN_TRANSLATE_OSREL,
237 .trans_osrel = __elfN(freebsd_trans_osrel)
238 };
239
240 static bool
241 __elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel)
242 {
243 uintptr_t p;
244
245 p = (uintptr_t)(note + 1);
246 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
247 *osrel = *(const int32_t *)(p);
248
249 return (true);
250 }
251
252 static const char GNU_ABI_VENDOR[] = "GNU";
253 static int GNU_KFREEBSD_ABI_DESC = 3;
254
255 Elf_Brandnote __elfN(kfreebsd_brandnote) = {
256 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR),
257 .hdr.n_descsz = 16, /* XXX at least 16 */
258 .hdr.n_type = 1,
259 .vendor = GNU_ABI_VENDOR,
260 .flags = BN_TRANSLATE_OSREL,
261 .trans_osrel = kfreebsd_trans_osrel
262 };
263
264 static bool
265 kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel)
266 {
267 const Elf32_Word *desc;
268 uintptr_t p;
269
270 p = (uintptr_t)(note + 1);
271 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
272
273 desc = (const Elf32_Word *)p;
274 if (desc[0] != GNU_KFREEBSD_ABI_DESC)
275 return (false);
276
277 /*
278 * Debian GNU/kFreeBSD embed the earliest compatible kernel version
279 * (__FreeBSD_version: <major><two digit minor>Rxx) in the LSB way.
280 */
281 *osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3];
282
283 return (true);
284 }
285
286 int
287 __elfN(insert_brand_entry)(Elf_Brandinfo *entry)
288 {
289 int i;
290
291 for (i = 0; i < MAX_BRANDS; i++) {
292 if (elf_brand_list[i] == NULL) {
293 elf_brand_list[i] = entry;
294 break;
295 }
296 }
297 if (i == MAX_BRANDS) {
298 printf("WARNING: %s: could not insert brandinfo entry: %p\n",
299 __func__, entry);
300 return (-1);
301 }
302 return (0);
303 }
304
305 int
306 __elfN(remove_brand_entry)(Elf_Brandinfo *entry)
307 {
308 int i;
309
310 for (i = 0; i < MAX_BRANDS; i++) {
311 if (elf_brand_list[i] == entry) {
312 elf_brand_list[i] = NULL;
313 break;
314 }
315 }
316 if (i == MAX_BRANDS)
317 return (-1);
318 return (0);
319 }
320
321 bool
322 __elfN(brand_inuse)(Elf_Brandinfo *entry)
323 {
324 struct proc *p;
325 bool rval = false;
326
327 sx_slock(&allproc_lock);
328 FOREACH_PROC_IN_SYSTEM(p) {
329 if (p->p_sysent == entry->sysvec) {
330 rval = true;
331 break;
332 }
333 }
334 sx_sunlock(&allproc_lock);
335
336 return (rval);
337 }
338
339 static Elf_Brandinfo *
340 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp,
341 int32_t *osrel, uint32_t *fctl0)
342 {
343 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
344 Elf_Brandinfo *bi, *bi_m;
345 bool ret, has_fctl0;
346 int i, interp_name_len;
347
348 interp_name_len = interp != NULL ? strlen(interp) + 1 : 0;
349
350 /*
351 * We support four types of branding -- (1) the ELF EI_OSABI field
352 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string
353 * branding w/in the ELF header, (3) path of the `interp_path'
354 * field, and (4) the ".note.ABI-tag" ELF section.
355 */
356
357 /* Look for an ".note.ABI-tag" ELF section */
358 bi_m = NULL;
359 for (i = 0; i < MAX_BRANDS; i++) {
360 bi = elf_brand_list[i];
361 if (bi == NULL)
362 continue;
363 if (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0)
364 continue;
365 if (hdr->e_machine == bi->machine && (bi->flags &
366 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) {
367 has_fctl0 = false;
368 *fctl0 = 0;
369 *osrel = 0;
370 ret = __elfN(check_note)(imgp, bi->brand_note, osrel,
371 &has_fctl0, fctl0);
372 /* Give brand a chance to veto check_note's guess */
373 if (ret && bi->header_supported) {
374 ret = bi->header_supported(imgp, osrel,
375 has_fctl0 ? fctl0 : NULL);
376 }
377 /*
378 * If note checker claimed the binary, but the
379 * interpreter path in the image does not
380 * match default one for the brand, try to
381 * search for other brands with the same
382 * interpreter. Either there is better brand
383 * with the right interpreter, or, failing
384 * this, we return first brand which accepted
385 * our note and, optionally, header.
386 */
387 if (ret && bi_m == NULL && interp != NULL &&
388 (bi->interp_path == NULL ||
389 (strlen(bi->interp_path) + 1 != interp_name_len ||
390 strncmp(interp, bi->interp_path, interp_name_len)
391 != 0))) {
392 bi_m = bi;
393 ret = 0;
394 }
395 if (ret)
396 return (bi);
397 }
398 }
399 if (bi_m != NULL)
400 return (bi_m);
401
402 /* If the executable has a brand, search for it in the brand list. */
403 for (i = 0; i < MAX_BRANDS; i++) {
404 bi = elf_brand_list[i];
405 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 ||
406 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0))
407 continue;
408 if (hdr->e_machine == bi->machine &&
409 (hdr->e_ident[EI_OSABI] == bi->brand ||
410 (bi->compat_3_brand != NULL &&
411 strcmp((const char *)&hdr->e_ident[OLD_EI_BRAND],
412 bi->compat_3_brand) == 0))) {
413 /* Looks good, but give brand a chance to veto */
414 if (bi->header_supported == NULL ||
415 bi->header_supported(imgp, NULL, NULL)) {
416 /*
417 * Again, prefer strictly matching
418 * interpreter path.
419 */
420 if (interp_name_len == 0 &&
421 bi->interp_path == NULL)
422 return (bi);
423 if (bi->interp_path != NULL &&
424 strlen(bi->interp_path) + 1 ==
425 interp_name_len && strncmp(interp,
426 bi->interp_path, interp_name_len) == 0)
427 return (bi);
428 if (bi_m == NULL)
429 bi_m = bi;
430 }
431 }
432 }
433 if (bi_m != NULL)
434 return (bi_m);
435
436 /* No known brand, see if the header is recognized by any brand */
437 for (i = 0; i < MAX_BRANDS; i++) {
438 bi = elf_brand_list[i];
439 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY ||
440 bi->header_supported == NULL)
441 continue;
442 if (hdr->e_machine == bi->machine) {
443 ret = bi->header_supported(imgp, NULL, NULL);
444 if (ret)
445 return (bi);
446 }
447 }
448
449 /* Lacking a known brand, search for a recognized interpreter. */
450 if (interp != NULL) {
451 for (i = 0; i < MAX_BRANDS; i++) {
452 bi = elf_brand_list[i];
453 if (bi == NULL || (bi->flags &
454 (BI_BRAND_NOTE_MANDATORY | BI_BRAND_ONLY_STATIC))
455 != 0)
456 continue;
457 if (hdr->e_machine == bi->machine &&
458 bi->interp_path != NULL &&
459 /* ELF image p_filesz includes terminating zero */
460 strlen(bi->interp_path) + 1 == interp_name_len &&
461 strncmp(interp, bi->interp_path, interp_name_len)
462 == 0 && (bi->header_supported == NULL ||
463 bi->header_supported(imgp, NULL, NULL)))
464 return (bi);
465 }
466 }
467
468 /* Lacking a recognized interpreter, try the default brand */
469 for (i = 0; i < MAX_BRANDS; i++) {
470 bi = elf_brand_list[i];
471 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 ||
472 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0))
473 continue;
474 if (hdr->e_machine == bi->machine &&
475 __elfN(fallback_brand) == bi->brand &&
476 (bi->header_supported == NULL ||
477 bi->header_supported(imgp, NULL, NULL)))
478 return (bi);
479 }
480 return (NULL);
481 }
482
483 static bool
484 __elfN(phdr_in_zero_page)(const Elf_Ehdr *hdr)
485 {
486 return (hdr->e_phoff <= PAGE_SIZE &&
487 (u_int)hdr->e_phentsize * hdr->e_phnum <= PAGE_SIZE - hdr->e_phoff);
488 }
489
490 static int
491 __elfN(check_header)(const Elf_Ehdr *hdr)
492 {
493 Elf_Brandinfo *bi;
494 int i;
495
496 if (!IS_ELF(*hdr) ||
497 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
498 hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
499 hdr->e_ident[EI_VERSION] != EV_CURRENT ||
500 hdr->e_phentsize != sizeof(Elf_Phdr) ||
501 hdr->e_version != ELF_TARG_VER)
502 return (ENOEXEC);
503
504 /*
505 * Make sure we have at least one brand for this machine.
506 */
507
508 for (i = 0; i < MAX_BRANDS; i++) {
509 bi = elf_brand_list[i];
510 if (bi != NULL && bi->machine == hdr->e_machine)
511 break;
512 }
513 if (i == MAX_BRANDS)
514 return (ENOEXEC);
515
516 return (0);
517 }
518
519 static int
520 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
521 vm_offset_t start, vm_offset_t end, vm_prot_t prot)
522 {
523 struct sf_buf *sf;
524 int error;
525 vm_offset_t off;
526
527 /*
528 * Create the page if it doesn't exist yet. Ignore errors.
529 */
530 vm_map_fixed(map, NULL, 0, trunc_page(start), round_page(end) -
531 trunc_page(start), VM_PROT_ALL, VM_PROT_ALL, MAP_CHECK_EXCL);
532
533 /*
534 * Find the page from the underlying object.
535 */
536 if (object != NULL) {
537 sf = vm_imgact_map_page(object, offset);
538 if (sf == NULL)
539 return (KERN_FAILURE);
540 off = offset - trunc_page(offset);
541 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start,
542 end - start);
543 vm_imgact_unmap_page(sf);
544 if (error != 0)
545 return (KERN_FAILURE);
546 }
547
548 return (KERN_SUCCESS);
549 }
550
551 static int
552 __elfN(map_insert)(struct image_params *imgp, vm_map_t map, vm_object_t object,
553 vm_ooffset_t offset, vm_offset_t start, vm_offset_t end, vm_prot_t prot,
554 int cow)
555 {
556 struct sf_buf *sf;
557 vm_offset_t off;
558 vm_size_t sz;
559 int error, locked, rv;
560
561 if (start != trunc_page(start)) {
562 rv = __elfN(map_partial)(map, object, offset, start,
563 round_page(start), prot);
564 if (rv != KERN_SUCCESS)
565 return (rv);
566 offset += round_page(start) - start;
567 start = round_page(start);
568 }
569 if (end != round_page(end)) {
570 rv = __elfN(map_partial)(map, object, offset +
571 trunc_page(end) - start, trunc_page(end), end, prot);
572 if (rv != KERN_SUCCESS)
573 return (rv);
574 end = trunc_page(end);
575 }
576 if (start >= end)
577 return (KERN_SUCCESS);
578 if ((offset & PAGE_MASK) != 0) {
579 /*
580 * The mapping is not page aligned. This means that we have
581 * to copy the data.
582 */
583 rv = vm_map_fixed(map, NULL, 0, start, end - start,
584 prot | VM_PROT_WRITE, VM_PROT_ALL, MAP_CHECK_EXCL);
585 if (rv != KERN_SUCCESS)
586 return (rv);
587 if (object == NULL)
588 return (KERN_SUCCESS);
589 for (; start < end; start += sz) {
590 sf = vm_imgact_map_page(object, offset);
591 if (sf == NULL)
592 return (KERN_FAILURE);
593 off = offset - trunc_page(offset);
594 sz = end - start;
595 if (sz > PAGE_SIZE - off)
596 sz = PAGE_SIZE - off;
597 error = copyout((caddr_t)sf_buf_kva(sf) + off,
598 (caddr_t)start, sz);
599 vm_imgact_unmap_page(sf);
600 if (error != 0)
601 return (KERN_FAILURE);
602 offset += sz;
603 }
604 } else {
605 vm_object_reference(object);
606 rv = vm_map_fixed(map, object, offset, start, end - start,
607 prot, VM_PROT_ALL, cow | MAP_CHECK_EXCL |
608 (object != NULL ? MAP_VN_EXEC : 0));
609 if (rv != KERN_SUCCESS) {
610 locked = VOP_ISLOCKED(imgp->vp);
611 VOP_UNLOCK(imgp->vp);
612 vm_object_deallocate(object);
613 vn_lock(imgp->vp, locked | LK_RETRY);
614 return (rv);
615 } else if (object != NULL) {
616 MPASS(imgp->vp->v_object == object);
617 VOP_SET_TEXT_CHECKED(imgp->vp);
618 }
619 }
620 return (KERN_SUCCESS);
621 }
622
623 static int
624 __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset,
625 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot)
626 {
627 struct sf_buf *sf;
628 size_t map_len;
629 vm_map_t map;
630 vm_object_t object;
631 vm_offset_t map_addr;
632 int error, rv, cow;
633 size_t copy_len;
634 vm_ooffset_t file_addr;
635
636 /*
637 * It's necessary to fail if the filsz + offset taken from the
638 * header is greater than the actual file pager object's size.
639 * If we were to allow this, then the vm_map_find() below would
640 * walk right off the end of the file object and into the ether.
641 *
642 * While I'm here, might as well check for something else that
643 * is invalid: filsz cannot be greater than memsz.
644 */
645 if ((filsz != 0 && (off_t)filsz + offset > imgp->attr->va_size) ||
646 filsz > memsz) {
647 uprintf("elf_load_section: truncated ELF file\n");
648 return (ENOEXEC);
649 }
650
651 object = imgp->object;
652 map = &imgp->proc->p_vmspace->vm_map;
653 map_addr = trunc_page((vm_offset_t)vmaddr);
654 file_addr = trunc_page(offset);
655
656 /*
657 * We have two choices. We can either clear the data in the last page
658 * of an oversized mapping, or we can start the anon mapping a page
659 * early and copy the initialized data into that first page. We
660 * choose the second.
661 */
662 if (filsz == 0)
663 map_len = 0;
664 else if (memsz > filsz)
665 map_len = trunc_page(offset + filsz) - file_addr;
666 else
667 map_len = round_page(offset + filsz) - file_addr;
668
669 if (map_len != 0) {
670 /* cow flags: don't dump readonly sections in core */
671 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT |
672 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP);
673
674 rv = __elfN(map_insert)(imgp, map, object, file_addr,
675 map_addr, map_addr + map_len, prot, cow);
676 if (rv != KERN_SUCCESS)
677 return (EINVAL);
678
679 /* we can stop now if we've covered it all */
680 if (memsz == filsz)
681 return (0);
682 }
683
684 /*
685 * We have to get the remaining bit of the file into the first part
686 * of the oversized map segment. This is normally because the .data
687 * segment in the file is extended to provide bss. It's a neat idea
688 * to try and save a page, but it's a pain in the behind to implement.
689 */
690 copy_len = filsz == 0 ? 0 : (offset + filsz) - trunc_page(offset +
691 filsz);
692 map_addr = trunc_page((vm_offset_t)vmaddr + filsz);
693 map_len = round_page((vm_offset_t)vmaddr + memsz) - map_addr;
694
695 /* This had damn well better be true! */
696 if (map_len != 0) {
697 rv = __elfN(map_insert)(imgp, map, NULL, 0, map_addr,
698 map_addr + map_len, prot, 0);
699 if (rv != KERN_SUCCESS)
700 return (EINVAL);
701 }
702
703 if (copy_len != 0) {
704 sf = vm_imgact_map_page(object, offset + filsz);
705 if (sf == NULL)
706 return (EIO);
707
708 /* send the page fragment to user space */
709 error = copyout((caddr_t)sf_buf_kva(sf), (caddr_t)map_addr,
710 copy_len);
711 vm_imgact_unmap_page(sf);
712 if (error != 0)
713 return (error);
714 }
715
716 /*
717 * Remove write access to the page if it was only granted by map_insert
718 * to allow copyout.
719 */
720 if ((prot & VM_PROT_WRITE) == 0)
721 vm_map_protect(map, trunc_page(map_addr), round_page(map_addr +
722 map_len), prot, 0, VM_MAP_PROTECT_SET_PROT);
723
724 return (0);
725 }
726
727 static int
728 __elfN(load_sections)(struct image_params *imgp, const Elf_Ehdr *hdr,
729 const Elf_Phdr *phdr, u_long rbase, u_long *base_addrp)
730 {
731 vm_prot_t prot;
732 u_long base_addr;
733 bool first;
734 int error, i;
735
736 ASSERT_VOP_LOCKED(imgp->vp, __func__);
737
738 base_addr = 0;
739 first = true;
740
741 for (i = 0; i < hdr->e_phnum; i++) {
742 if (phdr[i].p_type != PT_LOAD || phdr[i].p_memsz == 0)
743 continue;
744
745 /* Loadable segment */
746 prot = __elfN(trans_prot)(phdr[i].p_flags);
747 error = __elfN(load_section)(imgp, phdr[i].p_offset,
748 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase,
749 phdr[i].p_memsz, phdr[i].p_filesz, prot);
750 if (error != 0)
751 return (error);
752
753 /*
754 * Establish the base address if this is the first segment.
755 */
756 if (first) {
757 base_addr = trunc_page(phdr[i].p_vaddr + rbase);
758 first = false;
759 }
760 }
761
762 if (base_addrp != NULL)
763 *base_addrp = base_addr;
764
765 return (0);
766 }
767
768 /*
769 * Load the file "file" into memory. It may be either a shared object
770 * or an executable.
771 *
772 * The "addr" reference parameter is in/out. On entry, it specifies
773 * the address where a shared object should be loaded. If the file is
774 * an executable, this value is ignored. On exit, "addr" specifies
775 * where the file was actually loaded.
776 *
777 * The "entry" reference parameter is out only. On exit, it specifies
778 * the entry point for the loaded file.
779 */
780 static int
781 __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
782 u_long *entry)
783 {
784 struct {
785 struct nameidata nd;
786 struct vattr attr;
787 struct image_params image_params;
788 } *tempdata;
789 const Elf_Ehdr *hdr = NULL;
790 const Elf_Phdr *phdr = NULL;
791 struct nameidata *nd;
792 struct vattr *attr;
793 struct image_params *imgp;
794 u_long rbase;
795 u_long base_addr = 0;
796 int error;
797
798 #ifdef CAPABILITY_MODE
799 /*
800 * XXXJA: This check can go away once we are sufficiently confident
801 * that the checks in namei() are correct.
802 */
803 if (IN_CAPABILITY_MODE(curthread))
804 return (ECAPMODE);
805 #endif
806
807 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK | M_ZERO);
808 nd = &tempdata->nd;
809 attr = &tempdata->attr;
810 imgp = &tempdata->image_params;
811
812 /*
813 * Initialize part of the common data
814 */
815 imgp->proc = p;
816 imgp->attr = attr;
817
818 NDINIT(nd, LOOKUP, ISOPEN | FOLLOW | LOCKSHARED | LOCKLEAF,
819 UIO_SYSSPACE, file);
820 if ((error = namei(nd)) != 0) {
821 nd->ni_vp = NULL;
822 goto fail;
823 }
824 NDFREE_PNBUF(nd);
825 imgp->vp = nd->ni_vp;
826
827 /*
828 * Check permissions, modes, uid, etc on the file, and "open" it.
829 */
830 error = exec_check_permissions(imgp);
831 if (error)
832 goto fail;
833
834 error = exec_map_first_page(imgp);
835 if (error)
836 goto fail;
837
838 imgp->object = nd->ni_vp->v_object;
839
840 hdr = (const Elf_Ehdr *)imgp->image_header;
841 if ((error = __elfN(check_header)(hdr)) != 0)
842 goto fail;
843 if (hdr->e_type == ET_DYN)
844 rbase = *addr;
845 else if (hdr->e_type == ET_EXEC)
846 rbase = 0;
847 else {
848 error = ENOEXEC;
849 goto fail;
850 }
851
852 /* Only support headers that fit within first page for now */
853 if (!__elfN(phdr_in_zero_page)(hdr)) {
854 error = ENOEXEC;
855 goto fail;
856 }
857
858 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
859 if (!aligned(phdr, Elf_Addr)) {
860 error = ENOEXEC;
861 goto fail;
862 }
863
864 error = __elfN(load_sections)(imgp, hdr, phdr, rbase, &base_addr);
865 if (error != 0)
866 goto fail;
867
868 *addr = base_addr;
869 *entry = (unsigned long)hdr->e_entry + rbase;
870
871 fail:
872 if (imgp->firstpage)
873 exec_unmap_first_page(imgp);
874
875 if (nd->ni_vp) {
876 if (imgp->textset)
877 VOP_UNSET_TEXT_CHECKED(nd->ni_vp);
878 vput(nd->ni_vp);
879 }
880 free(tempdata, M_TEMP);
881
882 return (error);
883 }
884
885 /*
886 * Select randomized valid address in the map map, between minv and
887 * maxv, with specified alignment. The [minv, maxv) range must belong
888 * to the map. Note that function only allocates the address, it is
889 * up to caller to clamp maxv in a way that the final allocation
890 * length fit into the map.
891 *
892 * Result is returned in *resp, error code indicates that arguments
893 * did not pass sanity checks for overflow and range correctness.
894 */
895 static int
896 __CONCAT(rnd_, __elfN(base))(vm_map_t map, u_long minv, u_long maxv,
897 u_int align, u_long *resp)
898 {
899 u_long rbase, res;
900
901 MPASS(vm_map_min(map) <= minv);
902
903 if (minv >= maxv || minv + align >= maxv || maxv > vm_map_max(map)) {
904 uprintf("Invalid ELF segments layout\n");
905 return (ENOEXEC);
906 }
907
908 arc4rand(&rbase, sizeof(rbase), 0);
909 res = roundup(minv, (u_long)align) + rbase % (maxv - minv);
910 res &= ~((u_long)align - 1);
911 if (res >= maxv)
912 res -= align;
913
914 KASSERT(res >= minv,
915 ("res %#lx < minv %#lx, maxv %#lx rbase %#lx",
916 res, minv, maxv, rbase));
917 KASSERT(res < maxv,
918 ("res %#lx > maxv %#lx, minv %#lx rbase %#lx",
919 res, maxv, minv, rbase));
920
921 *resp = res;
922 return (0);
923 }
924
925 static int
926 __elfN(enforce_limits)(struct image_params *imgp, const Elf_Ehdr *hdr,
927 const Elf_Phdr *phdr, u_long et_dyn_addr)
928 {
929 struct vmspace *vmspace;
930 const char *err_str;
931 u_long text_size, data_size, total_size, text_addr, data_addr;
932 u_long seg_size, seg_addr;
933 int i;
934
935 err_str = NULL;
936 text_size = data_size = total_size = text_addr = data_addr = 0;
937
938 for (i = 0; i < hdr->e_phnum; i++) {
939 if (phdr[i].p_type != PT_LOAD || phdr[i].p_memsz == 0)
940 continue;
941
942 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr);
943 seg_size = round_page(phdr[i].p_memsz +
944 phdr[i].p_vaddr + et_dyn_addr - seg_addr);
945
946 /*
947 * Make the largest executable segment the official
948 * text segment and all others data.
949 *
950 * Note that obreak() assumes that data_addr + data_size == end
951 * of data load area, and the ELF file format expects segments
952 * to be sorted by address. If multiple data segments exist,
953 * the last one will be used.
954 */
955
956 if ((phdr[i].p_flags & PF_X) != 0 && text_size < seg_size) {
957 text_size = seg_size;
958 text_addr = seg_addr;
959 } else {
960 data_size = seg_size;
961 data_addr = seg_addr;
962 }
963 total_size += seg_size;
964 }
965
966 if (data_addr == 0 && data_size == 0) {
967 data_addr = text_addr;
968 data_size = text_size;
969 }
970
971 /*
972 * Check limits. It should be safe to check the
973 * limits after loading the segments since we do
974 * not actually fault in all the segments pages.
975 */
976 PROC_LOCK(imgp->proc);
977 if (data_size > lim_cur_proc(imgp->proc, RLIMIT_DATA))
978 err_str = "Data segment size exceeds process limit";
979 else if (text_size > maxtsiz)
980 err_str = "Text segment size exceeds system limit";
981 else if (total_size > lim_cur_proc(imgp->proc, RLIMIT_VMEM))
982 err_str = "Total segment size exceeds process limit";
983 else if (racct_set(imgp->proc, RACCT_DATA, data_size) != 0)
984 err_str = "Data segment size exceeds resource limit";
985 else if (racct_set(imgp->proc, RACCT_VMEM, total_size) != 0)
986 err_str = "Total segment size exceeds resource limit";
987 PROC_UNLOCK(imgp->proc);
988 if (err_str != NULL) {
989 uprintf("%s\n", err_str);
990 return (ENOMEM);
991 }
992
993 vmspace = imgp->proc->p_vmspace;
994 vmspace->vm_tsize = text_size >> PAGE_SHIFT;
995 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr;
996 vmspace->vm_dsize = data_size >> PAGE_SHIFT;
997 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr;
998
999 return (0);
1000 }
1001
1002 static int
1003 __elfN(get_interp)(struct image_params *imgp, const Elf_Phdr *phdr,
1004 char **interpp, bool *free_interpp)
1005 {
1006 struct thread *td;
1007 char *interp;
1008 int error, interp_name_len;
1009
1010 KASSERT(phdr->p_type == PT_INTERP,
1011 ("%s: p_type %u != PT_INTERP", __func__, phdr->p_type));
1012 ASSERT_VOP_LOCKED(imgp->vp, __func__);
1013
1014 td = curthread;
1015
1016 /* Path to interpreter */
1017 if (phdr->p_filesz < 2 || phdr->p_filesz > MAXPATHLEN) {
1018 uprintf("Invalid PT_INTERP\n");
1019 return (ENOEXEC);
1020 }
1021
1022 interp_name_len = phdr->p_filesz;
1023 if (phdr->p_offset > PAGE_SIZE ||
1024 interp_name_len > PAGE_SIZE - phdr->p_offset) {
1025 /*
1026 * The vnode lock might be needed by the pagedaemon to
1027 * clean pages owned by the vnode. Do not allow sleep
1028 * waiting for memory with the vnode locked, instead
1029 * try non-sleepable allocation first, and if it
1030 * fails, go to the slow path were we drop the lock
1031 * and do M_WAITOK. A text reference prevents
1032 * modifications to the vnode content.
1033 */
1034 interp = malloc(interp_name_len + 1, M_TEMP, M_NOWAIT);
1035 if (interp == NULL) {
1036 VOP_UNLOCK(imgp->vp);
1037 interp = malloc(interp_name_len + 1, M_TEMP, M_WAITOK);
1038 vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
1039 }
1040
1041 error = vn_rdwr(UIO_READ, imgp->vp, interp,
1042 interp_name_len, phdr->p_offset,
1043 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
1044 NOCRED, NULL, td);
1045 if (error != 0) {
1046 free(interp, M_TEMP);
1047 uprintf("i/o error PT_INTERP %d\n", error);
1048 return (error);
1049 }
1050 interp[interp_name_len] = '\0';
1051
1052 *interpp = interp;
1053 *free_interpp = true;
1054 return (0);
1055 }
1056
1057 interp = __DECONST(char *, imgp->image_header) + phdr->p_offset;
1058 if (interp[interp_name_len - 1] != '\0') {
1059 uprintf("Invalid PT_INTERP\n");
1060 return (ENOEXEC);
1061 }
1062
1063 *interpp = interp;
1064 *free_interpp = false;
1065 return (0);
1066 }
1067
1068 static int
1069 __elfN(load_interp)(struct image_params *imgp, const Elf_Brandinfo *brand_info,
1070 const char *interp, u_long *addr, u_long *entry)
1071 {
1072 char *path;
1073 int error;
1074
1075 if (brand_info->emul_path != NULL &&
1076 brand_info->emul_path[0] != '\0') {
1077 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1078 snprintf(path, MAXPATHLEN, "%s%s",
1079 brand_info->emul_path, interp);
1080 error = __elfN(load_file)(imgp->proc, path, addr, entry);
1081 free(path, M_TEMP);
1082 if (error == 0)
1083 return (0);
1084 }
1085
1086 if (brand_info->interp_newpath != NULL &&
1087 (brand_info->interp_path == NULL ||
1088 strcmp(interp, brand_info->interp_path) == 0)) {
1089 error = __elfN(load_file)(imgp->proc,
1090 brand_info->interp_newpath, addr, entry);
1091 if (error == 0)
1092 return (0);
1093 }
1094
1095 error = __elfN(load_file)(imgp->proc, interp, addr, entry);
1096 if (error == 0)
1097 return (0);
1098
1099 uprintf("ELF interpreter %s not found, error %d\n", interp, error);
1100 return (error);
1101 }
1102
1103 /*
1104 * Impossible et_dyn_addr initial value indicating that the real base
1105 * must be calculated later with some randomization applied.
1106 */
1107 #define ET_DYN_ADDR_RAND 1
1108
1109 static int
1110 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp)
1111 {
1112 struct thread *td;
1113 const Elf_Ehdr *hdr;
1114 const Elf_Phdr *phdr;
1115 Elf_Auxargs *elf_auxargs;
1116 struct vmspace *vmspace;
1117 vm_map_t map;
1118 char *interp;
1119 Elf_Brandinfo *brand_info;
1120 struct sysentvec *sv;
1121 u_long addr, baddr, et_dyn_addr, entry, proghdr;
1122 u_long maxalign, maxsalign, mapsz, maxv, maxv1, anon_loc;
1123 uint32_t fctl0;
1124 int32_t osrel;
1125 bool free_interp;
1126 int error, i, n;
1127
1128 hdr = (const Elf_Ehdr *)imgp->image_header;
1129
1130 /*
1131 * Do we have a valid ELF header ?
1132 *
1133 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later
1134 * if particular brand doesn't support it.
1135 */
1136 if (__elfN(check_header)(hdr) != 0 ||
1137 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN))
1138 return (-1);
1139
1140 /*
1141 * From here on down, we return an errno, not -1, as we've
1142 * detected an ELF file.
1143 */
1144
1145 if (!__elfN(phdr_in_zero_page)(hdr)) {
1146 uprintf("Program headers not in the first page\n");
1147 return (ENOEXEC);
1148 }
1149 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
1150 if (!aligned(phdr, Elf_Addr)) {
1151 uprintf("Unaligned program headers\n");
1152 return (ENOEXEC);
1153 }
1154
1155 n = error = 0;
1156 baddr = 0;
1157 osrel = 0;
1158 fctl0 = 0;
1159 entry = proghdr = 0;
1160 interp = NULL;
1161 free_interp = false;
1162 td = curthread;
1163
1164 /*
1165 * Somewhat arbitrary, limit accepted max alignment for the
1166 * loadable segment to the max supported superpage size. Too
1167 * large alignment requests are not useful and are indicators
1168 * of corrupted or outright malicious binary.
1169 */
1170 maxalign = PAGE_SIZE;
1171 maxsalign = PAGE_SIZE * 1024;
1172 for (i = MAXPAGESIZES - 1; i > 0; i--) {
1173 if (pagesizes[i] > maxsalign)
1174 maxsalign = pagesizes[i];
1175 }
1176
1177 mapsz = 0;
1178
1179 for (i = 0; i < hdr->e_phnum; i++) {
1180 switch (phdr[i].p_type) {
1181 case PT_LOAD:
1182 if (n == 0)
1183 baddr = phdr[i].p_vaddr;
1184 if (!powerof2(phdr[i].p_align) ||
1185 phdr[i].p_align > maxsalign) {
1186 uprintf("Invalid segment alignment\n");
1187 error = ENOEXEC;
1188 goto ret;
1189 }
1190 if (phdr[i].p_align > maxalign)
1191 maxalign = phdr[i].p_align;
1192 if (mapsz + phdr[i].p_memsz < mapsz) {
1193 uprintf("Mapsize overflow\n");
1194 error = ENOEXEC;
1195 goto ret;
1196 }
1197 mapsz += phdr[i].p_memsz;
1198 n++;
1199
1200 /*
1201 * If this segment contains the program headers,
1202 * remember their virtual address for the AT_PHDR
1203 * aux entry. Static binaries don't usually include
1204 * a PT_PHDR entry.
1205 */
1206 if (phdr[i].p_offset == 0 &&
1207 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize <=
1208 phdr[i].p_filesz)
1209 proghdr = phdr[i].p_vaddr + hdr->e_phoff;
1210 break;
1211 case PT_INTERP:
1212 /* Path to interpreter */
1213 if (interp != NULL) {
1214 uprintf("Multiple PT_INTERP headers\n");
1215 error = ENOEXEC;
1216 goto ret;
1217 }
1218 error = __elfN(get_interp)(imgp, &phdr[i], &interp,
1219 &free_interp);
1220 if (error != 0)
1221 goto ret;
1222 break;
1223 case PT_GNU_STACK:
1224 if (__elfN(nxstack)) {
1225 imgp->stack_prot =
1226 __elfN(trans_prot)(phdr[i].p_flags);
1227 if ((imgp->stack_prot & VM_PROT_RW) !=
1228 VM_PROT_RW) {
1229 uprintf("Invalid PT_GNU_STACK\n");
1230 error = ENOEXEC;
1231 goto ret;
1232 }
1233 }
1234 imgp->stack_sz = phdr[i].p_memsz;
1235 break;
1236 case PT_PHDR: /* Program header table info */
1237 proghdr = phdr[i].p_vaddr;
1238 break;
1239 }
1240 }
1241
1242 brand_info = __elfN(get_brandinfo)(imgp, interp, &osrel, &fctl0);
1243 if (brand_info == NULL) {
1244 uprintf("ELF binary type \"%u\" not known.\n",
1245 hdr->e_ident[EI_OSABI]);
1246 error = ENOEXEC;
1247 goto ret;
1248 }
1249 sv = brand_info->sysvec;
1250 et_dyn_addr = 0;
1251 if (hdr->e_type == ET_DYN) {
1252 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) {
1253 uprintf("Cannot execute shared object\n");
1254 error = ENOEXEC;
1255 goto ret;
1256 }
1257 /*
1258 * Honour the base load address from the dso if it is
1259 * non-zero for some reason.
1260 */
1261 if (baddr == 0) {
1262 if ((sv->sv_flags & SV_ASLR) == 0 ||
1263 (fctl0 & NT_FREEBSD_FCTL_ASLR_DISABLE) != 0)
1264 et_dyn_addr = __elfN(pie_base);
1265 else if ((__elfN(pie_aslr_enabled) &&
1266 (imgp->proc->p_flag2 & P2_ASLR_DISABLE) == 0) ||
1267 (imgp->proc->p_flag2 & P2_ASLR_ENABLE) != 0)
1268 et_dyn_addr = ET_DYN_ADDR_RAND;
1269 else
1270 et_dyn_addr = __elfN(pie_base);
1271 }
1272 }
1273
1274 /*
1275 * Avoid a possible deadlock if the current address space is destroyed
1276 * and that address space maps the locked vnode. In the common case,
1277 * the locked vnode's v_usecount is decremented but remains greater
1278 * than zero. Consequently, the vnode lock is not needed by vrele().
1279 * However, in cases where the vnode lock is external, such as nullfs,
1280 * v_usecount may become zero.
1281 *
1282 * The VV_TEXT flag prevents modifications to the executable while
1283 * the vnode is unlocked.
1284 */
1285 VOP_UNLOCK(imgp->vp);
1286
1287 /*
1288 * Decide whether to enable randomization of user mappings.
1289 * First, reset user preferences for the setid binaries.
1290 * Then, account for the support of the randomization by the
1291 * ABI, by user preferences, and make special treatment for
1292 * PIE binaries.
1293 */
1294 if (imgp->credential_setid) {
1295 PROC_LOCK(imgp->proc);
1296 imgp->proc->p_flag2 &= ~(P2_ASLR_ENABLE | P2_ASLR_DISABLE |
1297 P2_WXORX_DISABLE | P2_WXORX_ENABLE_EXEC);
1298 PROC_UNLOCK(imgp->proc);
1299 }
1300 if ((sv->sv_flags & SV_ASLR) == 0 ||
1301 (imgp->proc->p_flag2 & P2_ASLR_DISABLE) != 0 ||
1302 (fctl0 & NT_FREEBSD_FCTL_ASLR_DISABLE) != 0) {
1303 KASSERT(et_dyn_addr != ET_DYN_ADDR_RAND,
1304 ("et_dyn_addr == RAND and !ASLR"));
1305 } else if ((imgp->proc->p_flag2 & P2_ASLR_ENABLE) != 0 ||
1306 (__elfN(aslr_enabled) && hdr->e_type == ET_EXEC) ||
1307 et_dyn_addr == ET_DYN_ADDR_RAND) {
1308 imgp->map_flags |= MAP_ASLR;
1309 /*
1310 * If user does not care about sbrk, utilize the bss
1311 * grow region for mappings as well. We can select
1312 * the base for the image anywere and still not suffer
1313 * from the fragmentation.
1314 */
1315 if (!__elfN(aslr_honor_sbrk) ||
1316 (imgp->proc->p_flag2 & P2_ASLR_IGNSTART) != 0)
1317 imgp->map_flags |= MAP_ASLR_IGNSTART;
1318 if (__elfN(aslr_stack))
1319 imgp->map_flags |= MAP_ASLR_STACK;
1320 if (__elfN(aslr_shared_page))
1321 imgp->imgp_flags |= IMGP_ASLR_SHARED_PAGE;
1322 }
1323
1324 if ((!__elfN(allow_wx) && (fctl0 & NT_FREEBSD_FCTL_WXNEEDED) == 0 &&
1325 (imgp->proc->p_flag2 & P2_WXORX_DISABLE) == 0) ||
1326 (imgp->proc->p_flag2 & P2_WXORX_ENABLE_EXEC) != 0)
1327 imgp->map_flags |= MAP_WXORX;
1328
1329 error = exec_new_vmspace(imgp, sv);
1330
1331 imgp->proc->p_sysent = sv;
1332 imgp->proc->p_elf_brandinfo = brand_info;
1333
1334 vmspace = imgp->proc->p_vmspace;
1335 map = &vmspace->vm_map;
1336 maxv = sv->sv_usrstack;
1337 if ((imgp->map_flags & MAP_ASLR_STACK) == 0)
1338 maxv -= lim_max(td, RLIMIT_STACK);
1339 if (error == 0 && mapsz >= maxv - vm_map_min(map)) {
1340 uprintf("Excessive mapping size\n");
1341 error = ENOEXEC;
1342 }
1343
1344 if (error == 0 && et_dyn_addr == ET_DYN_ADDR_RAND) {
1345 KASSERT((map->flags & MAP_ASLR) != 0,
1346 ("ET_DYN_ADDR_RAND but !MAP_ASLR"));
1347 error = __CONCAT(rnd_, __elfN(base))(map,
1348 vm_map_min(map) + mapsz + lim_max(td, RLIMIT_DATA),
1349 /* reserve half of the address space to interpreter */
1350 maxv / 2, maxalign, &et_dyn_addr);
1351 }
1352
1353 vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
1354 if (error != 0)
1355 goto ret;
1356
1357 error = __elfN(load_sections)(imgp, hdr, phdr, et_dyn_addr, NULL);
1358 if (error != 0)
1359 goto ret;
1360
1361 error = __elfN(enforce_limits)(imgp, hdr, phdr, et_dyn_addr);
1362 if (error != 0)
1363 goto ret;
1364
1365 /*
1366 * We load the dynamic linker where a userland call
1367 * to mmap(0, ...) would put it. The rationale behind this
1368 * calculation is that it leaves room for the heap to grow to
1369 * its maximum allowed size.
1370 */
1371 addr = round_page((vm_offset_t)vmspace->vm_daddr + lim_max(td,
1372 RLIMIT_DATA));
1373 if ((map->flags & MAP_ASLR) != 0) {
1374 maxv1 = maxv / 2 + addr / 2;
1375 error = __CONCAT(rnd_, __elfN(base))(map, addr, maxv1,
1376 (MAXPAGESIZES > 1 && pagesizes[1] != 0) ?
1377 pagesizes[1] : pagesizes[0], &anon_loc);
1378 if (error != 0)
1379 goto ret;
1380 map->anon_loc = anon_loc;
1381 } else {
1382 map->anon_loc = addr;
1383 }
1384
1385 entry = (u_long)hdr->e_entry + et_dyn_addr;
1386 imgp->entry_addr = entry;
1387
1388 if (interp != NULL) {
1389 VOP_UNLOCK(imgp->vp);
1390 if ((map->flags & MAP_ASLR) != 0) {
1391 /* Assume that interpreter fits into 1/4 of AS */
1392 maxv1 = maxv / 2 + addr / 2;
1393 error = __CONCAT(rnd_, __elfN(base))(map, addr,
1394 maxv1, PAGE_SIZE, &addr);
1395 }
1396 if (error == 0) {
1397 error = __elfN(load_interp)(imgp, brand_info, interp,
1398 &addr, &imgp->entry_addr);
1399 }
1400 vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
1401 if (error != 0)
1402 goto ret;
1403 } else
1404 addr = et_dyn_addr;
1405
1406 error = exec_map_stack(imgp);
1407 if (error != 0)
1408 goto ret;
1409
1410 /*
1411 * Construct auxargs table (used by the copyout_auxargs routine)
1412 */
1413 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_NOWAIT);
1414 if (elf_auxargs == NULL) {
1415 VOP_UNLOCK(imgp->vp);
1416 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK);
1417 vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
1418 }
1419 elf_auxargs->execfd = -1;
1420 elf_auxargs->phdr = proghdr + et_dyn_addr;
1421 elf_auxargs->phent = hdr->e_phentsize;
1422 elf_auxargs->phnum = hdr->e_phnum;
1423 elf_auxargs->pagesz = PAGE_SIZE;
1424 elf_auxargs->base = addr;
1425 elf_auxargs->flags = 0;
1426 elf_auxargs->entry = entry;
1427 elf_auxargs->hdr_eflags = hdr->e_flags;
1428
1429 imgp->auxargs = elf_auxargs;
1430 imgp->interpreted = 0;
1431 imgp->reloc_base = addr;
1432 imgp->proc->p_osrel = osrel;
1433 imgp->proc->p_fctl0 = fctl0;
1434 imgp->proc->p_elf_flags = hdr->e_flags;
1435
1436 ret:
1437 ASSERT_VOP_LOCKED(imgp->vp, "skipped relock");
1438 if (free_interp)
1439 free(interp, M_TEMP);
1440 return (error);
1441 }
1442
1443 #define elf_suword __CONCAT(suword, __ELF_WORD_SIZE)
1444
1445 int
1446 __elfN(freebsd_copyout_auxargs)(struct image_params *imgp, uintptr_t base)
1447 {
1448 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs;
1449 Elf_Auxinfo *argarray, *pos;
1450 struct vmspace *vmspace;
1451 rlim_t stacksz;
1452 int error, bsdflags, oc;
1453
1454 argarray = pos = malloc(AT_COUNT * sizeof(*pos), M_TEMP,
1455 M_WAITOK | M_ZERO);
1456
1457 vmspace = imgp->proc->p_vmspace;
1458
1459 if (args->execfd != -1)
1460 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
1461 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
1462 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
1463 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
1464 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
1465 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
1466 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
1467 AUXARGS_ENTRY(pos, AT_BASE, args->base);
1468 AUXARGS_ENTRY(pos, AT_EHDRFLAGS, args->hdr_eflags);
1469 if (imgp->execpathp != 0)
1470 AUXARGS_ENTRY_PTR(pos, AT_EXECPATH, imgp->execpathp);
1471 AUXARGS_ENTRY(pos, AT_OSRELDATE,
1472 imgp->proc->p_ucred->cr_prison->pr_osreldate);
1473 if (imgp->canary != 0) {
1474 AUXARGS_ENTRY_PTR(pos, AT_CANARY, imgp->canary);
1475 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen);
1476 }
1477 AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus);
1478 if (imgp->pagesizes != 0) {
1479 AUXARGS_ENTRY_PTR(pos, AT_PAGESIZES, imgp->pagesizes);
1480 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen);
1481 }
1482 if ((imgp->sysent->sv_flags & SV_TIMEKEEP) != 0) {
1483 AUXARGS_ENTRY(pos, AT_TIMEKEEP,
1484 vmspace->vm_shp_base + imgp->sysent->sv_timekeep_offset);
1485 }
1486 AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj
1487 != NULL && imgp->stack_prot != 0 ? imgp->stack_prot :
1488 imgp->sysent->sv_stackprot);
1489 if (imgp->sysent->sv_hwcap != NULL)
1490 AUXARGS_ENTRY(pos, AT_HWCAP, *imgp->sysent->sv_hwcap);
1491 if (imgp->sysent->sv_hwcap2 != NULL)
1492 AUXARGS_ENTRY(pos, AT_HWCAP2, *imgp->sysent->sv_hwcap2);
1493 bsdflags = 0;
1494 bsdflags |= __elfN(sigfastblock) ? ELF_BSDF_SIGFASTBLK : 0;
1495 oc = atomic_load_int(&vm_overcommit);
1496 bsdflags |= (oc & (SWAP_RESERVE_FORCE_ON | SWAP_RESERVE_RLIMIT_ON)) !=
1497 0 ? ELF_BSDF_VMNOOVERCOMMIT : 0;
1498 AUXARGS_ENTRY(pos, AT_BSDFLAGS, bsdflags);
1499 AUXARGS_ENTRY(pos, AT_ARGC, imgp->args->argc);
1500 AUXARGS_ENTRY_PTR(pos, AT_ARGV, imgp->argv);
1501 AUXARGS_ENTRY(pos, AT_ENVC, imgp->args->envc);
1502 AUXARGS_ENTRY_PTR(pos, AT_ENVV, imgp->envv);
1503 AUXARGS_ENTRY_PTR(pos, AT_PS_STRINGS, imgp->ps_strings);
1504 #ifdef RANDOM_FENESTRASX
1505 if ((imgp->sysent->sv_flags & SV_RNG_SEED_VER) != 0) {
1506 AUXARGS_ENTRY(pos, AT_FXRNG,
1507 vmspace->vm_shp_base + imgp->sysent->sv_fxrng_gen_offset);
1508 }
1509 #endif
1510 if ((imgp->sysent->sv_flags & SV_DSO_SIG) != 0 && __elfN(vdso) != 0) {
1511 AUXARGS_ENTRY(pos, AT_KPRELOAD,
1512 vmspace->vm_shp_base + imgp->sysent->sv_vdso_offset);
1513 }
1514 AUXARGS_ENTRY(pos, AT_USRSTACKBASE, round_page(vmspace->vm_stacktop));
1515 stacksz = imgp->proc->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur;
1516 AUXARGS_ENTRY(pos, AT_USRSTACKLIM, stacksz);
1517 AUXARGS_ENTRY(pos, AT_NULL, 0);
1518
1519 free(imgp->auxargs, M_TEMP);
1520 imgp->auxargs = NULL;
1521 KASSERT(pos - argarray <= AT_COUNT, ("Too many auxargs"));
1522
1523 error = copyout(argarray, (void *)base, sizeof(*argarray) * AT_COUNT);
1524 free(argarray, M_TEMP);
1525 return (error);
1526 }
1527
1528 int
1529 __elfN(freebsd_fixup)(uintptr_t *stack_base, struct image_params *imgp)
1530 {
1531 Elf_Addr *base;
1532
1533 base = (Elf_Addr *)*stack_base;
1534 base--;
1535 if (elf_suword(base, imgp->args->argc) == -1)
1536 return (EFAULT);
1537 *stack_base = (uintptr_t)base;
1538 return (0);
1539 }
1540
1541 /*
1542 * Code for generating ELF core dumps.
1543 */
1544
1545 typedef void (*segment_callback)(vm_map_entry_t, void *);
1546
1547 /* Closure for cb_put_phdr(). */
1548 struct phdr_closure {
1549 Elf_Phdr *phdr; /* Program header to fill in */
1550 Elf_Off offset; /* Offset of segment in core file */
1551 };
1552
1553 struct note_info {
1554 int type; /* Note type. */
1555 struct regset *regset; /* Register set. */
1556 outfunc_t outfunc; /* Output function. */
1557 void *outarg; /* Argument for the output function. */
1558 size_t outsize; /* Output size. */
1559 TAILQ_ENTRY(note_info) link; /* Link to the next note info. */
1560 };
1561
1562 TAILQ_HEAD(note_info_list, note_info);
1563
1564 extern int compress_user_cores;
1565 extern int compress_user_cores_level;
1566
1567 static void cb_put_phdr(vm_map_entry_t, void *);
1568 static void cb_size_segment(vm_map_entry_t, void *);
1569 static void each_dumpable_segment(struct thread *, segment_callback, void *,
1570 int);
1571 static int __elfN(corehdr)(struct coredump_params *, int, void *, size_t,
1572 struct note_info_list *, size_t, int);
1573 static void __elfN(putnote)(struct thread *td, struct note_info *, struct sbuf *);
1574
1575 static void __elfN(note_prpsinfo)(void *, struct sbuf *, size_t *);
1576 static void __elfN(note_threadmd)(void *, struct sbuf *, size_t *);
1577 static void __elfN(note_procstat_auxv)(void *, struct sbuf *, size_t *);
1578 static void __elfN(note_procstat_proc)(void *, struct sbuf *, size_t *);
1579 static void __elfN(note_procstat_psstrings)(void *, struct sbuf *, size_t *);
1580 static void note_procstat_files(void *, struct sbuf *, size_t *);
1581 static void note_procstat_groups(void *, struct sbuf *, size_t *);
1582 static void note_procstat_osrel(void *, struct sbuf *, size_t *);
1583 static void note_procstat_rlimit(void *, struct sbuf *, size_t *);
1584 static void note_procstat_umask(void *, struct sbuf *, size_t *);
1585 static void note_procstat_vmmap(void *, struct sbuf *, size_t *);
1586
1587 static int
1588 core_compressed_write(void *base, size_t len, off_t offset, void *arg)
1589 {
1590
1591 return (core_write((struct coredump_params *)arg, base, len, offset,
1592 UIO_SYSSPACE, NULL));
1593 }
1594
1595 int
1596 __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags)
1597 {
1598 struct ucred *cred = td->td_ucred;
1599 int compm, error = 0;
1600 struct sseg_closure seginfo;
1601 struct note_info_list notelst;
1602 struct coredump_params params;
1603 struct note_info *ninfo;
1604 void *hdr, *tmpbuf;
1605 size_t hdrsize, notesz, coresize;
1606
1607 hdr = NULL;
1608 tmpbuf = NULL;
1609 TAILQ_INIT(¬elst);
1610
1611 /* Size the program segments. */
1612 __elfN(size_segments)(td, &seginfo, flags);
1613
1614 /*
1615 * Collect info about the core file header area.
1616 */
1617 hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count);
1618 if (seginfo.count + 1 >= PN_XNUM)
1619 hdrsize += sizeof(Elf_Shdr);
1620 td->td_proc->p_sysent->sv_elf_core_prepare_notes(td, ¬elst, ¬esz);
1621 coresize = round_page(hdrsize + notesz) + seginfo.size;
1622
1623 /* Set up core dump parameters. */
1624 params.offset = 0;
1625 params.active_cred = cred;
1626 params.file_cred = NOCRED;
1627 params.td = td;
1628 params.vp = vp;
1629 params.comp = NULL;
1630
1631 #ifdef RACCT
1632 if (racct_enable) {
1633 PROC_LOCK(td->td_proc);
1634 error = racct_add(td->td_proc, RACCT_CORE, coresize);
1635 PROC_UNLOCK(td->td_proc);
1636 if (error != 0) {
1637 error = EFAULT;
1638 goto done;
1639 }
1640 }
1641 #endif
1642 if (coresize >= limit) {
1643 error = EFAULT;
1644 goto done;
1645 }
1646
1647 /* Create a compression stream if necessary. */
1648 compm = compress_user_cores;
1649 if ((flags & (SVC_PT_COREDUMP | SVC_NOCOMPRESS)) == SVC_PT_COREDUMP &&
1650 compm == 0)
1651 compm = COMPRESS_GZIP;
1652 if (compm != 0) {
1653 params.comp = compressor_init(core_compressed_write,
1654 compm, CORE_BUF_SIZE,
1655 compress_user_cores_level, ¶ms);
1656 if (params.comp == NULL) {
1657 error = EFAULT;
1658 goto done;
1659 }
1660 tmpbuf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO);
1661 }
1662
1663 /*
1664 * Allocate memory for building the header, fill it up,
1665 * and write it out following the notes.
1666 */
1667 hdr = malloc(hdrsize, M_TEMP, M_WAITOK);
1668 error = __elfN(corehdr)(¶ms, seginfo.count, hdr, hdrsize, ¬elst,
1669 notesz, flags);
1670
1671 /* Write the contents of all of the writable segments. */
1672 if (error == 0) {
1673 Elf_Phdr *php;
1674 off_t offset;
1675 int i;
1676
1677 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1;
1678 offset = round_page(hdrsize + notesz);
1679 for (i = 0; i < seginfo.count; i++) {
1680 error = core_output((char *)(uintptr_t)php->p_vaddr,
1681 php->p_filesz, offset, ¶ms, tmpbuf);
1682 if (error != 0)
1683 break;
1684 offset += php->p_filesz;
1685 php++;
1686 }
1687 if (error == 0 && params.comp != NULL)
1688 error = compressor_flush(params.comp);
1689 }
1690 if (error) {
1691 log(LOG_WARNING,
1692 "Failed to write core file for process %s (error %d)\n",
1693 curproc->p_comm, error);
1694 }
1695
1696 done:
1697 free(tmpbuf, M_TEMP);
1698 if (params.comp != NULL)
1699 compressor_fini(params.comp);
1700 while ((ninfo = TAILQ_FIRST(¬elst)) != NULL) {
1701 TAILQ_REMOVE(¬elst, ninfo, link);
1702 free(ninfo, M_TEMP);
1703 }
1704 if (hdr != NULL)
1705 free(hdr, M_TEMP);
1706
1707 return (error);
1708 }
1709
1710 /*
1711 * A callback for each_dumpable_segment() to write out the segment's
1712 * program header entry.
1713 */
1714 static void
1715 cb_put_phdr(vm_map_entry_t entry, void *closure)
1716 {
1717 struct phdr_closure *phc = (struct phdr_closure *)closure;
1718 Elf_Phdr *phdr = phc->phdr;
1719
1720 phc->offset = round_page(phc->offset);
1721
1722 phdr->p_type = PT_LOAD;
1723 phdr->p_offset = phc->offset;
1724 phdr->p_vaddr = entry->start;
1725 phdr->p_paddr = 0;
1726 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
1727 phdr->p_align = PAGE_SIZE;
1728 phdr->p_flags = __elfN(untrans_prot)(entry->protection);
1729
1730 phc->offset += phdr->p_filesz;
1731 phc->phdr++;
1732 }
1733
1734 /*
1735 * A callback for each_dumpable_segment() to gather information about
1736 * the number of segments and their total size.
1737 */
1738 static void
1739 cb_size_segment(vm_map_entry_t entry, void *closure)
1740 {
1741 struct sseg_closure *ssc = (struct sseg_closure *)closure;
1742
1743 ssc->count++;
1744 ssc->size += entry->end - entry->start;
1745 }
1746
1747 void
1748 __elfN(size_segments)(struct thread *td, struct sseg_closure *seginfo,
1749 int flags)
1750 {
1751 seginfo->count = 0;
1752 seginfo->size = 0;
1753
1754 each_dumpable_segment(td, cb_size_segment, seginfo, flags);
1755 }
1756
1757 /*
1758 * For each writable segment in the process's memory map, call the given
1759 * function with a pointer to the map entry and some arbitrary
1760 * caller-supplied data.
1761 */
1762 static void
1763 each_dumpable_segment(struct thread *td, segment_callback func, void *closure,
1764 int flags)
1765 {
1766 struct proc *p = td->td_proc;
1767 vm_map_t map = &p->p_vmspace->vm_map;
1768 vm_map_entry_t entry;
1769 vm_object_t backing_object, object;
1770 bool ignore_entry;
1771
1772 vm_map_lock_read(map);
1773 VM_MAP_ENTRY_FOREACH(entry, map) {
1774 /*
1775 * Don't dump inaccessible mappings, deal with legacy
1776 * coredump mode.
1777 *
1778 * Note that read-only segments related to the elf binary
1779 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer
1780 * need to arbitrarily ignore such segments.
1781 */
1782 if ((flags & SVC_ALL) == 0) {
1783 if (elf_legacy_coredump) {
1784 if ((entry->protection & VM_PROT_RW) !=
1785 VM_PROT_RW)
1786 continue;
1787 } else {
1788 if ((entry->protection & VM_PROT_ALL) == 0)
1789 continue;
1790 }
1791 }
1792
1793 /*
1794 * Dont include memory segment in the coredump if
1795 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in
1796 * madvise(2). Do not dump submaps (i.e. parts of the
1797 * kernel map).
1798 */
1799 if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0)
1800 continue;
1801 if ((entry->eflags & MAP_ENTRY_NOCOREDUMP) != 0 &&
1802 (flags & SVC_ALL) == 0)
1803 continue;
1804 if ((object = entry->object.vm_object) == NULL)
1805 continue;
1806
1807 /* Ignore memory-mapped devices and such things. */
1808 VM_OBJECT_RLOCK(object);
1809 while ((backing_object = object->backing_object) != NULL) {
1810 VM_OBJECT_RLOCK(backing_object);
1811 VM_OBJECT_RUNLOCK(object);
1812 object = backing_object;
1813 }
1814 ignore_entry = (object->flags & OBJ_FICTITIOUS) != 0;
1815 VM_OBJECT_RUNLOCK(object);
1816 if (ignore_entry)
1817 continue;
1818
1819 (*func)(entry, closure);
1820 }
1821 vm_map_unlock_read(map);
1822 }
1823
1824 /*
1825 * Write the core file header to the file, including padding up to
1826 * the page boundary.
1827 */
1828 static int
1829 __elfN(corehdr)(struct coredump_params *p, int numsegs, void *hdr,
1830 size_t hdrsize, struct note_info_list *notelst, size_t notesz,
1831 int flags)
1832 {
1833 struct note_info *ninfo;
1834 struct sbuf *sb;
1835 int error;
1836
1837 /* Fill in the header. */
1838 bzero(hdr, hdrsize);
1839 __elfN(puthdr)(p->td, hdr, hdrsize, numsegs, notesz, flags);
1840
1841 sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN);
1842 sbuf_set_drain(sb, sbuf_drain_core_output, p);
1843 sbuf_start_section(sb, NULL);
1844 sbuf_bcat(sb, hdr, hdrsize);
1845 TAILQ_FOREACH(ninfo, notelst, link)
1846 __elfN(putnote)(p->td, ninfo, sb);
1847 /* Align up to a page boundary for the program segments. */
1848 sbuf_end_section(sb, -1, PAGE_SIZE, 0);
1849 error = sbuf_finish(sb);
1850 sbuf_delete(sb);
1851
1852 return (error);
1853 }
1854
1855 void
1856 __elfN(prepare_notes)(struct thread *td, struct note_info_list *list,
1857 size_t *sizep)
1858 {
1859 struct proc *p;
1860 struct thread *thr;
1861 size_t size;
1862
1863 p = td->td_proc;
1864 size = 0;
1865
1866 size += __elfN(register_note)(td, list, NT_PRPSINFO,
1867 __elfN(note_prpsinfo), p);
1868
1869 /*
1870 * To have the debugger select the right thread (LWP) as the initial
1871 * thread, we dump the state of the thread passed to us in td first.
1872 * This is the thread that causes the core dump and thus likely to
1873 * be the right thread one wants to have selected in the debugger.
1874 */
1875 thr = td;
1876 while (thr != NULL) {
1877 size += __elfN(prepare_register_notes)(td, list, thr);
1878 size += __elfN(register_note)(td, list, -1,
1879 __elfN(note_threadmd), thr);
1880
1881 thr = thr == td ? TAILQ_FIRST(&p->p_threads) :
1882 TAILQ_NEXT(thr, td_plist);
1883 if (thr == td)
1884 thr = TAILQ_NEXT(thr, td_plist);
1885 }
1886
1887 size += __elfN(register_note)(td, list, NT_PROCSTAT_PROC,
1888 __elfN(note_procstat_proc), p);
1889 size += __elfN(register_note)(td, list, NT_PROCSTAT_FILES,
1890 note_procstat_files, p);
1891 size += __elfN(register_note)(td, list, NT_PROCSTAT_VMMAP,
1892 note_procstat_vmmap, p);
1893 size += __elfN(register_note)(td, list, NT_PROCSTAT_GROUPS,
1894 note_procstat_groups, p);
1895 size += __elfN(register_note)(td, list, NT_PROCSTAT_UMASK,
1896 note_procstat_umask, p);
1897 size += __elfN(register_note)(td, list, NT_PROCSTAT_RLIMIT,
1898 note_procstat_rlimit, p);
1899 size += __elfN(register_note)(td, list, NT_PROCSTAT_OSREL,
1900 note_procstat_osrel, p);
1901 size += __elfN(register_note)(td, list, NT_PROCSTAT_PSSTRINGS,
1902 __elfN(note_procstat_psstrings), p);
1903 size += __elfN(register_note)(td, list, NT_PROCSTAT_AUXV,
1904 __elfN(note_procstat_auxv), p);
1905
1906 *sizep = size;
1907 }
1908
1909 void
1910 __elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs,
1911 size_t notesz, int flags)
1912 {
1913 Elf_Ehdr *ehdr;
1914 Elf_Phdr *phdr;
1915 Elf_Shdr *shdr;
1916 struct phdr_closure phc;
1917 Elf_Brandinfo *bi;
1918
1919 ehdr = (Elf_Ehdr *)hdr;
1920 bi = td->td_proc->p_elf_brandinfo;
1921
1922 ehdr->e_ident[EI_MAG0] = ELFMAG0;
1923 ehdr->e_ident[EI_MAG1] = ELFMAG1;
1924 ehdr->e_ident[EI_MAG2] = ELFMAG2;
1925 ehdr->e_ident[EI_MAG3] = ELFMAG3;
1926 ehdr->e_ident[EI_CLASS] = ELF_CLASS;
1927 ehdr->e_ident[EI_DATA] = ELF_DATA;
1928 ehdr->e_ident[EI_VERSION] = EV_CURRENT;
1929 ehdr->e_ident[EI_OSABI] = td->td_proc->p_sysent->sv_elf_core_osabi;
1930 ehdr->e_ident[EI_ABIVERSION] = 0;
1931 ehdr->e_ident[EI_PAD] = 0;
1932 ehdr->e_type = ET_CORE;
1933 ehdr->e_machine = bi->machine;
1934 ehdr->e_version = EV_CURRENT;
1935 ehdr->e_entry = 0;
1936 ehdr->e_phoff = sizeof(Elf_Ehdr);
1937 ehdr->e_flags = td->td_proc->p_elf_flags;
1938 ehdr->e_ehsize = sizeof(Elf_Ehdr);
1939 ehdr->e_phentsize = sizeof(Elf_Phdr);
1940 ehdr->e_shentsize = sizeof(Elf_Shdr);
1941 ehdr->e_shstrndx = SHN_UNDEF;
1942 if (numsegs + 1 < PN_XNUM) {
1943 ehdr->e_phnum = numsegs + 1;
1944 ehdr->e_shnum = 0;
1945 } else {
1946 ehdr->e_phnum = PN_XNUM;
1947 ehdr->e_shnum = 1;
1948
1949 ehdr->e_shoff = ehdr->e_phoff +
1950 (numsegs + 1) * ehdr->e_phentsize;
1951 KASSERT(ehdr->e_shoff == hdrsize - sizeof(Elf_Shdr),
1952 ("e_shoff: %zu, hdrsize - shdr: %zu",
1953 (size_t)ehdr->e_shoff, hdrsize - sizeof(Elf_Shdr)));
1954
1955 shdr = (Elf_Shdr *)((char *)hdr + ehdr->e_shoff);
1956 memset(shdr, 0, sizeof(*shdr));
1957 /*
1958 * A special first section is used to hold large segment and
1959 * section counts. This was proposed by Sun Microsystems in
1960 * Solaris and has been adopted by Linux; the standard ELF
1961 * tools are already familiar with the technique.
1962 *
1963 * See table 7-7 of the Solaris "Linker and Libraries Guide"
1964 * (or 12-7 depending on the version of the document) for more
1965 * details.
1966 */
1967 shdr->sh_type = SHT_NULL;
1968 shdr->sh_size = ehdr->e_shnum;
1969 shdr->sh_link = ehdr->e_shstrndx;
1970 shdr->sh_info = numsegs + 1;
1971 }
1972
1973 /*
1974 * Fill in the program header entries.
1975 */
1976 phdr = (Elf_Phdr *)((char *)hdr + ehdr->e_phoff);
1977
1978 /* The note segement. */
1979 phdr->p_type = PT_NOTE;
1980 phdr->p_offset = hdrsize;
1981 phdr->p_vaddr = 0;
1982 phdr->p_paddr = 0;
1983 phdr->p_filesz = notesz;
1984 phdr->p_memsz = 0;
1985 phdr->p_flags = PF_R;
1986 phdr->p_align = ELF_NOTE_ROUNDSIZE;
1987 phdr++;
1988
1989 /* All the writable segments from the program. */
1990 phc.phdr = phdr;
1991 phc.offset = round_page(hdrsize + notesz);
1992 each_dumpable_segment(td, cb_put_phdr, &phc, flags);
1993 }
1994
1995 static size_t
1996 __elfN(register_regset_note)(struct thread *td, struct note_info_list *list,
1997 struct regset *regset, struct thread *target_td)
1998 {
1999 const struct sysentvec *sv;
2000 struct note_info *ninfo;
2001 size_t size, notesize;
2002
2003 size = 0;
2004 if (!regset->get(regset, target_td, NULL, &size) || size == 0)
2005 return (0);
2006
2007 ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK);
2008 ninfo->type = regset->note;
2009 ninfo->regset = regset;
2010 ninfo->outarg = target_td;
2011 ninfo->outsize = size;
2012 TAILQ_INSERT_TAIL(list, ninfo, link);
2013
2014 sv = td->td_proc->p_sysent;
2015 notesize = sizeof(Elf_Note) + /* note header */
2016 roundup2(strlen(sv->sv_elf_core_abi_vendor) + 1, ELF_NOTE_ROUNDSIZE) +
2017 /* note name */
2018 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */
2019
2020 return (notesize);
2021 }
2022
2023 size_t
2024 __elfN(register_note)(struct thread *td, struct note_info_list *list,
2025 int type, outfunc_t out, void *arg)
2026 {
2027 const struct sysentvec *sv;
2028 struct note_info *ninfo;
2029 size_t size, notesize;
2030
2031 sv = td->td_proc->p_sysent;
2032 size = 0;
2033 out(arg, NULL, &size);
2034 ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK);
2035 ninfo->type = type;
2036 ninfo->outfunc = out;
2037 ninfo->outarg = arg;
2038 ninfo->outsize = size;
2039 TAILQ_INSERT_TAIL(list, ninfo, link);
2040
2041 if (type == -1)
2042 return (size);
2043
2044 notesize = sizeof(Elf_Note) + /* note header */
2045 roundup2(strlen(sv->sv_elf_core_abi_vendor) + 1, ELF_NOTE_ROUNDSIZE) +
2046 /* note name */
2047 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */
2048
2049 return (notesize);
2050 }
2051
2052 static size_t
2053 append_note_data(const void *src, void *dst, size_t len)
2054 {
2055 size_t padded_len;
2056
2057 padded_len = roundup2(len, ELF_NOTE_ROUNDSIZE);
2058 if (dst != NULL) {
2059 bcopy(src, dst, len);
2060 bzero((char *)dst + len, padded_len - len);
2061 }
2062 return (padded_len);
2063 }
2064
2065 size_t
2066 __elfN(populate_note)(int type, void *src, void *dst, size_t size, void **descp)
2067 {
2068 Elf_Note *note;
2069 char *buf;
2070 size_t notesize;
2071
2072 buf = dst;
2073 if (buf != NULL) {
2074 note = (Elf_Note *)buf;
2075 note->n_namesz = sizeof(FREEBSD_ABI_VENDOR);
2076 note->n_descsz = size;
2077 note->n_type = type;
2078 buf += sizeof(*note);
2079 buf += append_note_data(FREEBSD_ABI_VENDOR, buf,
2080 sizeof(FREEBSD_ABI_VENDOR));
2081 append_note_data(src, buf, size);
2082 if (descp != NULL)
2083 *descp = buf;
2084 }
2085
2086 notesize = sizeof(Elf_Note) + /* note header */
2087 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) +
2088 /* note name */
2089 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */
2090
2091 return (notesize);
2092 }
2093
2094 static void
2095 __elfN(putnote)(struct thread *td, struct note_info *ninfo, struct sbuf *sb)
2096 {
2097 Elf_Note note;
2098 const struct sysentvec *sv;
2099 ssize_t old_len, sect_len;
2100 size_t new_len, descsz, i;
2101
2102 if (ninfo->type == -1) {
2103 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize);
2104 return;
2105 }
2106
2107 sv = td->td_proc->p_sysent;
2108
2109 note.n_namesz = strlen(sv->sv_elf_core_abi_vendor) + 1;
2110 note.n_descsz = ninfo->outsize;
2111 note.n_type = ninfo->type;
2112
2113 sbuf_bcat(sb, ¬e, sizeof(note));
2114 sbuf_start_section(sb, &old_len);
2115 sbuf_bcat(sb, sv->sv_elf_core_abi_vendor,
2116 strlen(sv->sv_elf_core_abi_vendor) + 1);
2117 sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0);
2118 if (note.n_descsz == 0)
2119 return;
2120 sbuf_start_section(sb, &old_len);
2121 if (ninfo->regset != NULL) {
2122 struct regset *regset = ninfo->regset;
2123 void *buf;
2124
2125 buf = malloc(ninfo->outsize, M_TEMP, M_ZERO | M_WAITOK);
2126 (void)regset->get(regset, ninfo->outarg, buf, &ninfo->outsize);
2127 sbuf_bcat(sb, buf, ninfo->outsize);
2128 free(buf, M_TEMP);
2129 } else
2130 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize);
2131 sect_len = sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0);
2132 if (sect_len < 0)
2133 return;
2134
2135 new_len = (size_t)sect_len;
2136 descsz = roundup(note.n_descsz, ELF_NOTE_ROUNDSIZE);
2137 if (new_len < descsz) {
2138 /*
2139 * It is expected that individual note emitters will correctly
2140 * predict their expected output size and fill up to that size
2141 * themselves, padding in a format-specific way if needed.
2142 * However, in case they don't, just do it here with zeros.
2143 */
2144 for (i = 0; i < descsz - new_len; i++)
2145 sbuf_putc(sb, 0);
2146 } else if (new_len > descsz) {
2147 /*
2148 * We can't always truncate sb -- we may have drained some
2149 * of it already.
2150 */
2151 KASSERT(new_len == descsz, ("%s: Note type %u changed as we "
2152 "read it (%zu > %zu). Since it is longer than "
2153 "expected, this coredump's notes are corrupt. THIS "
2154 "IS A BUG in the note_procstat routine for type %u.\n",
2155 __func__, (unsigned)note.n_type, new_len, descsz,
2156 (unsigned)note.n_type));
2157 }
2158 }
2159
2160 /*
2161 * Miscellaneous note out functions.
2162 */
2163
2164 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2165 #include <compat/freebsd32/freebsd32.h>
2166 #include <compat/freebsd32/freebsd32_signal.h>
2167
2168 typedef struct prstatus32 elf_prstatus_t;
2169 typedef struct prpsinfo32 elf_prpsinfo_t;
2170 typedef struct fpreg32 elf_prfpregset_t;
2171 typedef struct fpreg32 elf_fpregset_t;
2172 typedef struct reg32 elf_gregset_t;
2173 typedef struct thrmisc32 elf_thrmisc_t;
2174 typedef struct ptrace_lwpinfo32 elf_lwpinfo_t;
2175 #define ELF_KERN_PROC_MASK KERN_PROC_MASK32
2176 typedef struct kinfo_proc32 elf_kinfo_proc_t;
2177 typedef uint32_t elf_ps_strings_t;
2178 #else
2179 typedef prstatus_t elf_prstatus_t;
2180 typedef prpsinfo_t elf_prpsinfo_t;
2181 typedef prfpregset_t elf_prfpregset_t;
2182 typedef prfpregset_t elf_fpregset_t;
2183 typedef gregset_t elf_gregset_t;
2184 typedef thrmisc_t elf_thrmisc_t;
2185 typedef struct ptrace_lwpinfo elf_lwpinfo_t;
2186 #define ELF_KERN_PROC_MASK 0
2187 typedef struct kinfo_proc elf_kinfo_proc_t;
2188 typedef vm_offset_t elf_ps_strings_t;
2189 #endif
2190
2191 static void
2192 __elfN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep)
2193 {
2194 struct sbuf sbarg;
2195 size_t len;
2196 char *cp, *end;
2197 struct proc *p;
2198 elf_prpsinfo_t *psinfo;
2199 int error;
2200
2201 p = arg;
2202 if (sb != NULL) {
2203 KASSERT(*sizep == sizeof(*psinfo), ("invalid size"));
2204 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK);
2205 psinfo->pr_version = PRPSINFO_VERSION;
2206 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t);
2207 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname));
2208 PROC_LOCK(p);
2209 if (p->p_args != NULL) {
2210 len = sizeof(psinfo->pr_psargs) - 1;
2211 if (len > p->p_args->ar_length)
2212 len = p->p_args->ar_length;
2213 memcpy(psinfo->pr_psargs, p->p_args->ar_args, len);
2214 PROC_UNLOCK(p);
2215 error = 0;
2216 } else {
2217 _PHOLD(p);
2218 PROC_UNLOCK(p);
2219 sbuf_new(&sbarg, psinfo->pr_psargs,
2220 sizeof(psinfo->pr_psargs), SBUF_FIXEDLEN);
2221 error = proc_getargv(curthread, p, &sbarg);
2222 PRELE(p);
2223 if (sbuf_finish(&sbarg) == 0) {
2224 len = sbuf_len(&sbarg);
2225 if (len > 0)
2226 len--;
2227 } else {
2228 len = sizeof(psinfo->pr_psargs) - 1;
2229 }
2230 sbuf_delete(&sbarg);
2231 }
2232 if (error != 0 || len == 0 || (ssize_t)len == -1)
2233 strlcpy(psinfo->pr_psargs, p->p_comm,
2234 sizeof(psinfo->pr_psargs));
2235 else {
2236 KASSERT(len < sizeof(psinfo->pr_psargs),
2237 ("len is too long: %zu vs %zu", len,
2238 sizeof(psinfo->pr_psargs)));
2239 cp = psinfo->pr_psargs;
2240 end = cp + len - 1;
2241 for (;;) {
2242 cp = memchr(cp, '\0', end - cp);
2243 if (cp == NULL)
2244 break;
2245 *cp = ' ';
2246 }
2247 }
2248 psinfo->pr_pid = p->p_pid;
2249 sbuf_bcat(sb, psinfo, sizeof(*psinfo));
2250 free(psinfo, M_TEMP);
2251 }
2252 *sizep = sizeof(*psinfo);
2253 }
2254
2255 static bool
2256 __elfN(get_prstatus)(struct regset *rs, struct thread *td, void *buf,
2257 size_t *sizep)
2258 {
2259 elf_prstatus_t *status;
2260
2261 if (buf != NULL) {
2262 KASSERT(*sizep == sizeof(*status), ("%s: invalid size",
2263 __func__));
2264 status = buf;
2265 memset(status, 0, *sizep);
2266 status->pr_version = PRSTATUS_VERSION;
2267 status->pr_statussz = sizeof(elf_prstatus_t);
2268 status->pr_gregsetsz = sizeof(elf_gregset_t);
2269 status->pr_fpregsetsz = sizeof(elf_fpregset_t);
2270 status->pr_osreldate = osreldate;
2271 status->pr_cursig = td->td_proc->p_sig;
2272 status->pr_pid = td->td_tid;
2273 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2274 fill_regs32(td, &status->pr_reg);
2275 #else
2276 fill_regs(td, &status->pr_reg);
2277 #endif
2278 }
2279 *sizep = sizeof(*status);
2280 return (true);
2281 }
2282
2283 static bool
2284 __elfN(set_prstatus)(struct regset *rs, struct thread *td, void *buf,
2285 size_t size)
2286 {
2287 elf_prstatus_t *status;
2288
2289 KASSERT(size == sizeof(*status), ("%s: invalid size", __func__));
2290 status = buf;
2291 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2292 set_regs32(td, &status->pr_reg);
2293 #else
2294 set_regs(td, &status->pr_reg);
2295 #endif
2296 return (true);
2297 }
2298
2299 static struct regset __elfN(regset_prstatus) = {
2300 .note = NT_PRSTATUS,
2301 .size = sizeof(elf_prstatus_t),
2302 .get = __elfN(get_prstatus),
2303 .set = __elfN(set_prstatus),
2304 };
2305 ELF_REGSET(__elfN(regset_prstatus));
2306
2307 static bool
2308 __elfN(get_fpregset)(struct regset *rs, struct thread *td, void *buf,
2309 size_t *sizep)
2310 {
2311 elf_prfpregset_t *fpregset;
2312
2313 if (buf != NULL) {
2314 KASSERT(*sizep == sizeof(*fpregset), ("%s: invalid size",
2315 __func__));
2316 fpregset = buf;
2317 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2318 fill_fpregs32(td, fpregset);
2319 #else
2320 fill_fpregs(td, fpregset);
2321 #endif
2322 }
2323 *sizep = sizeof(*fpregset);
2324 return (true);
2325 }
2326
2327 static bool
2328 __elfN(set_fpregset)(struct regset *rs, struct thread *td, void *buf,
2329 size_t size)
2330 {
2331 elf_prfpregset_t *fpregset;
2332
2333 fpregset = buf;
2334 KASSERT(size == sizeof(*fpregset), ("%s: invalid size", __func__));
2335 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2336 set_fpregs32(td, fpregset);
2337 #else
2338 set_fpregs(td, fpregset);
2339 #endif
2340 return (true);
2341 }
2342
2343 static struct regset __elfN(regset_fpregset) = {
2344 .note = NT_FPREGSET,
2345 .size = sizeof(elf_prfpregset_t),
2346 .get = __elfN(get_fpregset),
2347 .set = __elfN(set_fpregset),
2348 };
2349 ELF_REGSET(__elfN(regset_fpregset));
2350
2351 static bool
2352 __elfN(get_thrmisc)(struct regset *rs, struct thread *td, void *buf,
2353 size_t *sizep)
2354 {
2355 elf_thrmisc_t *thrmisc;
2356
2357 if (buf != NULL) {
2358 KASSERT(*sizep == sizeof(*thrmisc),
2359 ("%s: invalid size", __func__));
2360 thrmisc = buf;
2361 bzero(thrmisc, sizeof(*thrmisc));
2362 strcpy(thrmisc->pr_tname, td->td_name);
2363 }
2364 *sizep = sizeof(*thrmisc);
2365 return (true);
2366 }
2367
2368 static struct regset __elfN(regset_thrmisc) = {
2369 .note = NT_THRMISC,
2370 .size = sizeof(elf_thrmisc_t),
2371 .get = __elfN(get_thrmisc),
2372 };
2373 ELF_REGSET(__elfN(regset_thrmisc));
2374
2375 static bool
2376 __elfN(get_lwpinfo)(struct regset *rs, struct thread *td, void *buf,
2377 size_t *sizep)
2378 {
2379 elf_lwpinfo_t pl;
2380 size_t size;
2381 int structsize;
2382
2383 size = sizeof(structsize) + sizeof(pl);
2384 if (buf != NULL) {
2385 KASSERT(*sizep == size, ("%s: invalid size", __func__));
2386 structsize = sizeof(pl);
2387 memcpy(buf, &structsize, sizeof(structsize));
2388 bzero(&pl, sizeof(pl));
2389 pl.pl_lwpid = td->td_tid;
2390 pl.pl_event = PL_EVENT_NONE;
2391 pl.pl_sigmask = td->td_sigmask;
2392 pl.pl_siglist = td->td_siglist;
2393 if (td->td_si.si_signo != 0) {
2394 pl.pl_event = PL_EVENT_SIGNAL;
2395 pl.pl_flags |= PL_FLAG_SI;
2396 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2397 siginfo_to_siginfo32(&td->td_si, &pl.pl_siginfo);
2398 #else
2399 pl.pl_siginfo = td->td_si;
2400 #endif
2401 }
2402 strcpy(pl.pl_tdname, td->td_name);
2403 /* XXX TODO: supply more information in struct ptrace_lwpinfo*/
2404 memcpy((int *)buf + 1, &pl, sizeof(pl));
2405 }
2406 *sizep = size;
2407 return (true);
2408 }
2409
2410 static struct regset __elfN(regset_lwpinfo) = {
2411 .note = NT_PTLWPINFO,
2412 .size = sizeof(int) + sizeof(elf_lwpinfo_t),
2413 .get = __elfN(get_lwpinfo),
2414 };
2415 ELF_REGSET(__elfN(regset_lwpinfo));
2416
2417 static size_t
2418 __elfN(prepare_register_notes)(struct thread *td, struct note_info_list *list,
2419 struct thread *target_td)
2420 {
2421 struct sysentvec *sv = td->td_proc->p_sysent;
2422 struct regset **regsetp, **regset_end, *regset;
2423 size_t size;
2424
2425 size = 0;
2426
2427 /* NT_PRSTATUS must be the first register set note. */
2428 size += __elfN(register_regset_note)(td, list, &__elfN(regset_prstatus),
2429 target_td);
2430
2431 regsetp = sv->sv_regset_begin;
2432 if (regsetp == NULL) {
2433 /* XXX: This shouldn't be true for any FreeBSD ABIs. */
2434 size += __elfN(register_regset_note)(td, list,
2435 &__elfN(regset_fpregset), target_td);
2436 return (size);
2437 }
2438 regset_end = sv->sv_regset_end;
2439 MPASS(regset_end != NULL);
2440 for (; regsetp < regset_end; regsetp++) {
2441 regset = *regsetp;
2442 if (regset->note == NT_PRSTATUS)
2443 continue;
2444 size += __elfN(register_regset_note)(td, list, regset,
2445 target_td);
2446 }
2447 return (size);
2448 }
2449
2450 /*
2451 * Allow for MD specific notes, as well as any MD
2452 * specific preparations for writing MI notes.
2453 */
2454 static void
2455 __elfN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep)
2456 {
2457 struct thread *td;
2458 void *buf;
2459 size_t size;
2460
2461 td = (struct thread *)arg;
2462 size = *sizep;
2463 if (size != 0 && sb != NULL)
2464 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK);
2465 else
2466 buf = NULL;
2467 size = 0;
2468 __elfN(dump_thread)(td, buf, &size);
2469 KASSERT(sb == NULL || *sizep == size, ("invalid size"));
2470 if (size != 0 && sb != NULL)
2471 sbuf_bcat(sb, buf, size);
2472 free(buf, M_TEMP);
2473 *sizep = size;
2474 }
2475
2476 #ifdef KINFO_PROC_SIZE
2477 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE);
2478 #endif
2479
2480 static void
2481 __elfN(note_procstat_proc)(void *arg, struct sbuf *sb, size_t *sizep)
2482 {
2483 struct proc *p;
2484 size_t size;
2485 int structsize;
2486
2487 p = arg;
2488 size = sizeof(structsize) + p->p_numthreads *
2489 sizeof(elf_kinfo_proc_t);
2490
2491 if (sb != NULL) {
2492 KASSERT(*sizep == size, ("invalid size"));
2493 structsize = sizeof(elf_kinfo_proc_t);
2494 sbuf_bcat(sb, &structsize, sizeof(structsize));
2495 sx_slock(&proctree_lock);
2496 PROC_LOCK(p);
2497 kern_proc_out(p, sb, ELF_KERN_PROC_MASK);
2498 sx_sunlock(&proctree_lock);
2499 }
2500 *sizep = size;
2501 }
2502
2503 #ifdef KINFO_FILE_SIZE
2504 CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE);
2505 #endif
2506
2507 static void
2508 note_procstat_files(void *arg, struct sbuf *sb, size_t *sizep)
2509 {
2510 struct proc *p;
2511 size_t size, sect_sz, i;
2512 ssize_t start_len, sect_len;
2513 int structsize, filedesc_flags;
2514
2515 if (coredump_pack_fileinfo)
2516 filedesc_flags = KERN_FILEDESC_PACK_KINFO;
2517 else
2518 filedesc_flags = 0;
2519
2520 p = arg;
2521 structsize = sizeof(struct kinfo_file);
2522 if (sb == NULL) {
2523 size = 0;
2524 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
2525 sbuf_set_drain(sb, sbuf_count_drain, &size);
2526 sbuf_bcat(sb, &structsize, sizeof(structsize));
2527 PROC_LOCK(p);
2528 kern_proc_filedesc_out(p, sb, -1, filedesc_flags);
2529 sbuf_finish(sb);
2530 sbuf_delete(sb);
2531 *sizep = size;
2532 } else {
2533 sbuf_start_section(sb, &start_len);
2534
2535 sbuf_bcat(sb, &structsize, sizeof(structsize));
2536 PROC_LOCK(p);
2537 kern_proc_filedesc_out(p, sb, *sizep - sizeof(structsize),
2538 filedesc_flags);
2539
2540 sect_len = sbuf_end_section(sb, start_len, 0, 0);
2541 if (sect_len < 0)
2542 return;
2543 sect_sz = sect_len;
2544
2545 KASSERT(sect_sz <= *sizep,
2546 ("kern_proc_filedesc_out did not respect maxlen; "
2547 "requested %zu, got %zu", *sizep - sizeof(structsize),
2548 sect_sz - sizeof(structsize)));
2549
2550 for (i = 0; i < *sizep - sect_sz && sb->s_error == 0; i++)
2551 sbuf_putc(sb, 0);
2552 }
2553 }
2554
2555 #ifdef KINFO_VMENTRY_SIZE
2556 CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE);
2557 #endif
2558
2559 static void
2560 note_procstat_vmmap(void *arg, struct sbuf *sb, size_t *sizep)
2561 {
2562 struct proc *p;
2563 size_t size;
2564 int structsize, vmmap_flags;
2565
2566 if (coredump_pack_vmmapinfo)
2567 vmmap_flags = KERN_VMMAP_PACK_KINFO;
2568 else
2569 vmmap_flags = 0;
2570
2571 p = arg;
2572 structsize = sizeof(struct kinfo_vmentry);
2573 if (sb == NULL) {
2574 size = 0;
2575 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
2576 sbuf_set_drain(sb, sbuf_count_drain, &size);
2577 sbuf_bcat(sb, &structsize, sizeof(structsize));
2578 PROC_LOCK(p);
2579 kern_proc_vmmap_out(p, sb, -1, vmmap_flags);
2580 sbuf_finish(sb);
2581 sbuf_delete(sb);
2582 *sizep = size;
2583 } else {
2584 sbuf_bcat(sb, &structsize, sizeof(structsize));
2585 PROC_LOCK(p);
2586 kern_proc_vmmap_out(p, sb, *sizep - sizeof(structsize),
2587 vmmap_flags);
2588 }
2589 }
2590
2591 static void
2592 note_procstat_groups(void *arg, struct sbuf *sb, size_t *sizep)
2593 {
2594 struct proc *p;
2595 size_t size;
2596 int structsize;
2597
2598 p = arg;
2599 size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t);
2600 if (sb != NULL) {
2601 KASSERT(*sizep == size, ("invalid size"));
2602 structsize = sizeof(gid_t);
2603 sbuf_bcat(sb, &structsize, sizeof(structsize));
2604 sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups *
2605 sizeof(gid_t));
2606 }
2607 *sizep = size;
2608 }
2609
2610 static void
2611 note_procstat_umask(void *arg, struct sbuf *sb, size_t *sizep)
2612 {
2613 struct proc *p;
2614 size_t size;
2615 int structsize;
2616
2617 p = arg;
2618 size = sizeof(structsize) + sizeof(p->p_pd->pd_cmask);
2619 if (sb != NULL) {
2620 KASSERT(*sizep == size, ("invalid size"));
2621 structsize = sizeof(p->p_pd->pd_cmask);
2622 sbuf_bcat(sb, &structsize, sizeof(structsize));
2623 sbuf_bcat(sb, &p->p_pd->pd_cmask, sizeof(p->p_pd->pd_cmask));
2624 }
2625 *sizep = size;
2626 }
2627
2628 static void
2629 note_procstat_rlimit(void *arg, struct sbuf *sb, size_t *sizep)
2630 {
2631 struct proc *p;
2632 struct rlimit rlim[RLIM_NLIMITS];
2633 size_t size;
2634 int structsize, i;
2635
2636 p = arg;
2637 size = sizeof(structsize) + sizeof(rlim);
2638 if (sb != NULL) {
2639 KASSERT(*sizep == size, ("invalid size"));
2640 structsize = sizeof(rlim);
2641 sbuf_bcat(sb, &structsize, sizeof(structsize));
2642 PROC_LOCK(p);
2643 for (i = 0; i < RLIM_NLIMITS; i++)
2644 lim_rlimit_proc(p, i, &rlim[i]);
2645 PROC_UNLOCK(p);
2646 sbuf_bcat(sb, rlim, sizeof(rlim));
2647 }
2648 *sizep = size;
2649 }
2650
2651 static void
2652 note_procstat_osrel(void *arg, struct sbuf *sb, size_t *sizep)
2653 {
2654 struct proc *p;
2655 size_t size;
2656 int structsize;
2657
2658 p = arg;
2659 size = sizeof(structsize) + sizeof(p->p_osrel);
2660 if (sb != NULL) {
2661 KASSERT(*sizep == size, ("invalid size"));
2662 structsize = sizeof(p->p_osrel);
2663 sbuf_bcat(sb, &structsize, sizeof(structsize));
2664 sbuf_bcat(sb, &p->p_osrel, sizeof(p->p_osrel));
2665 }
2666 *sizep = size;
2667 }
2668
2669 static void
2670 __elfN(note_procstat_psstrings)(void *arg, struct sbuf *sb, size_t *sizep)
2671 {
2672 struct proc *p;
2673 elf_ps_strings_t ps_strings;
2674 size_t size;
2675 int structsize;
2676
2677 p = arg;
2678 size = sizeof(structsize) + sizeof(ps_strings);
2679 if (sb != NULL) {
2680 KASSERT(*sizep == size, ("invalid size"));
2681 structsize = sizeof(ps_strings);
2682 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2683 ps_strings = PTROUT(PROC_PS_STRINGS(p));
2684 #else
2685 ps_strings = PROC_PS_STRINGS(p);
2686 #endif
2687 sbuf_bcat(sb, &structsize, sizeof(structsize));
2688 sbuf_bcat(sb, &ps_strings, sizeof(ps_strings));
2689 }
2690 *sizep = size;
2691 }
2692
2693 static void
2694 __elfN(note_procstat_auxv)(void *arg, struct sbuf *sb, size_t *sizep)
2695 {
2696 struct proc *p;
2697 size_t size;
2698 int structsize;
2699
2700 p = arg;
2701 if (sb == NULL) {
2702 size = 0;
2703 sb = sbuf_new(NULL, NULL, AT_COUNT * sizeof(Elf_Auxinfo),
2704 SBUF_FIXEDLEN);
2705 sbuf_set_drain(sb, sbuf_count_drain, &size);
2706 sbuf_bcat(sb, &structsize, sizeof(structsize));
2707 PHOLD(p);
2708 proc_getauxv(curthread, p, sb);
2709 PRELE(p);
2710 sbuf_finish(sb);
2711 sbuf_delete(sb);
2712 *sizep = size;
2713 } else {
2714 structsize = sizeof(Elf_Auxinfo);
2715 sbuf_bcat(sb, &structsize, sizeof(structsize));
2716 PHOLD(p);
2717 proc_getauxv(curthread, p, sb);
2718 PRELE(p);
2719 }
2720 }
2721
2722 static bool
2723 __elfN(parse_notes)(struct image_params *imgp, Elf_Note *checknote,
2724 const char *note_vendor, const Elf_Phdr *pnote,
2725 bool (*cb)(const Elf_Note *, void *, bool *), void *cb_arg)
2726 {
2727 const Elf_Note *note, *note0, *note_end;
2728 const char *note_name;
2729 char *buf;
2730 int i, error;
2731 bool res;
2732
2733 /* We need some limit, might as well use PAGE_SIZE. */
2734 if (pnote == NULL || pnote->p_filesz > PAGE_SIZE)
2735 return (false);
2736 ASSERT_VOP_LOCKED(imgp->vp, "parse_notes");
2737 if (pnote->p_offset > PAGE_SIZE ||
2738 pnote->p_filesz > PAGE_SIZE - pnote->p_offset) {
2739 buf = malloc(pnote->p_filesz, M_TEMP, M_NOWAIT);
2740 if (buf == NULL) {
2741 VOP_UNLOCK(imgp->vp);
2742 buf = malloc(pnote->p_filesz, M_TEMP, M_WAITOK);
2743 vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
2744 }
2745 error = vn_rdwr(UIO_READ, imgp->vp, buf, pnote->p_filesz,
2746 pnote->p_offset, UIO_SYSSPACE, IO_NODELOCKED,
2747 curthread->td_ucred, NOCRED, NULL, curthread);
2748 if (error != 0) {
2749 uprintf("i/o error PT_NOTE\n");
2750 goto retf;
2751 }
2752 note = note0 = (const Elf_Note *)buf;
2753 note_end = (const Elf_Note *)(buf + pnote->p_filesz);
2754 } else {
2755 note = note0 = (const Elf_Note *)(imgp->image_header +
2756 pnote->p_offset);
2757 note_end = (const Elf_Note *)(imgp->image_header +
2758 pnote->p_offset + pnote->p_filesz);
2759 buf = NULL;
2760 }
2761 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) {
2762 if (!aligned(note, Elf32_Addr) || (const char *)note_end -
2763 (const char *)note < sizeof(Elf_Note)) {
2764 goto retf;
2765 }
2766 if (note->n_namesz != checknote->n_namesz ||
2767 note->n_descsz != checknote->n_descsz ||
2768 note->n_type != checknote->n_type)
2769 goto nextnote;
2770 note_name = (const char *)(note + 1);
2771 if (note_name + checknote->n_namesz >=
2772 (const char *)note_end || strncmp(note_vendor,
2773 note_name, checknote->n_namesz) != 0)
2774 goto nextnote;
2775
2776 if (cb(note, cb_arg, &res))
2777 goto ret;
2778 nextnote:
2779 note = (const Elf_Note *)((const char *)(note + 1) +
2780 roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) +
2781 roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE));
2782 }
2783 retf:
2784 res = false;
2785 ret:
2786 free(buf, M_TEMP);
2787 return (res);
2788 }
2789
2790 struct brandnote_cb_arg {
2791 Elf_Brandnote *brandnote;
2792 int32_t *osrel;
2793 };
2794
2795 static bool
2796 brandnote_cb(const Elf_Note *note, void *arg0, bool *res)
2797 {
2798 struct brandnote_cb_arg *arg;
2799
2800 arg = arg0;
2801
2802 /*
2803 * Fetch the osreldate for binary from the ELF OSABI-note if
2804 * necessary.
2805 */
2806 *res = (arg->brandnote->flags & BN_TRANSLATE_OSREL) != 0 &&
2807 arg->brandnote->trans_osrel != NULL ?
2808 arg->brandnote->trans_osrel(note, arg->osrel) : true;
2809
2810 return (true);
2811 }
2812
2813 static Elf_Note fctl_note = {
2814 .n_namesz = sizeof(FREEBSD_ABI_VENDOR),
2815 .n_descsz = sizeof(uint32_t),
2816 .n_type = NT_FREEBSD_FEATURE_CTL,
2817 };
2818
2819 struct fctl_cb_arg {
2820 bool *has_fctl0;
2821 uint32_t *fctl0;
2822 };
2823
2824 static bool
2825 note_fctl_cb(const Elf_Note *note, void *arg0, bool *res)
2826 {
2827 struct fctl_cb_arg *arg;
2828 const Elf32_Word *desc;
2829 uintptr_t p;
2830
2831 arg = arg0;
2832 p = (uintptr_t)(note + 1);
2833 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
2834 desc = (const Elf32_Word *)p;
2835 *arg->has_fctl0 = true;
2836 *arg->fctl0 = desc[0];
2837 *res = true;
2838 return (true);
2839 }
2840
2841 /*
2842 * Try to find the appropriate ABI-note section for checknote, fetch
2843 * the osreldate and feature control flags for binary from the ELF
2844 * OSABI-note. Only the first page of the image is searched, the same
2845 * as for headers.
2846 */
2847 static bool
2848 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *brandnote,
2849 int32_t *osrel, bool *has_fctl0, uint32_t *fctl0)
2850 {
2851 const Elf_Phdr *phdr;
2852 const Elf_Ehdr *hdr;
2853 struct brandnote_cb_arg b_arg;
2854 struct fctl_cb_arg f_arg;
2855 int i, j;
2856
2857 hdr = (const Elf_Ehdr *)imgp->image_header;
2858 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
2859 b_arg.brandnote = brandnote;
2860 b_arg.osrel = osrel;
2861 f_arg.has_fctl0 = has_fctl0;
2862 f_arg.fctl0 = fctl0;
2863
2864 for (i = 0; i < hdr->e_phnum; i++) {
2865 if (phdr[i].p_type == PT_NOTE && __elfN(parse_notes)(imgp,
2866 &brandnote->hdr, brandnote->vendor, &phdr[i], brandnote_cb,
2867 &b_arg)) {
2868 for (j = 0; j < hdr->e_phnum; j++) {
2869 if (phdr[j].p_type == PT_NOTE &&
2870 __elfN(parse_notes)(imgp, &fctl_note,
2871 FREEBSD_ABI_VENDOR, &phdr[j],
2872 note_fctl_cb, &f_arg))
2873 break;
2874 }
2875 return (true);
2876 }
2877 }
2878 return (false);
2879
2880 }
2881
2882 /*
2883 * Tell kern_execve.c about it, with a little help from the linker.
2884 */
2885 static struct execsw __elfN(execsw) = {
2886 .ex_imgact = __CONCAT(exec_, __elfN(imgact)),
2887 .ex_name = __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
2888 };
2889 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw));
2890
2891 static vm_prot_t
2892 __elfN(trans_prot)(Elf_Word flags)
2893 {
2894 vm_prot_t prot;
2895
2896 prot = 0;
2897 if (flags & PF_X)
2898 prot |= VM_PROT_EXECUTE;
2899 if (flags & PF_W)
2900 prot |= VM_PROT_WRITE;
2901 if (flags & PF_R)
2902 prot |= VM_PROT_READ;
2903 #if __ELF_WORD_SIZE == 32 && (defined(__amd64__) || defined(__i386__))
2904 if (i386_read_exec && (flags & PF_R))
2905 prot |= VM_PROT_EXECUTE;
2906 #endif
2907 return (prot);
2908 }
2909
2910 static Elf_Word
2911 __elfN(untrans_prot)(vm_prot_t prot)
2912 {
2913 Elf_Word flags;
2914
2915 flags = 0;
2916 if (prot & VM_PROT_EXECUTE)
2917 flags |= PF_X;
2918 if (prot & VM_PROT_READ)
2919 flags |= PF_R;
2920 if (prot & VM_PROT_WRITE)
2921 flags |= PF_W;
2922 return (flags);
2923 }
Cache object: aee43032b71731dee6b50e04c298aab8
|