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 boolean_t __elfN(check_note)(struct image_params *imgp,
101 Elf_Brandnote *checknote, int32_t *osrel, boolean_t *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(sigfastblock) = 1;
212 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, sigfastblock,
213 CTLFLAG_RWTUN, &__elfN(sigfastblock), 0,
214 "enable sigfastblock for new processes");
215
216 static bool __elfN(allow_wx) = true;
217 SYSCTL_BOOL(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, allow_wx,
218 CTLFLAG_RWTUN, &__elfN(allow_wx), 0,
219 "Allow pages to be mapped simultaneously writable and executable");
220
221 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS];
222
223 #define aligned(a, t) (rounddown2((u_long)(a), sizeof(t)) == (u_long)(a))
224
225 Elf_Brandnote __elfN(freebsd_brandnote) = {
226 .hdr.n_namesz = sizeof(FREEBSD_ABI_VENDOR),
227 .hdr.n_descsz = sizeof(int32_t),
228 .hdr.n_type = NT_FREEBSD_ABI_TAG,
229 .vendor = FREEBSD_ABI_VENDOR,
230 .flags = BN_TRANSLATE_OSREL,
231 .trans_osrel = __elfN(freebsd_trans_osrel)
232 };
233
234 static bool
235 __elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel)
236 {
237 uintptr_t p;
238
239 p = (uintptr_t)(note + 1);
240 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
241 *osrel = *(const int32_t *)(p);
242
243 return (true);
244 }
245
246 static const char GNU_ABI_VENDOR[] = "GNU";
247 static int GNU_KFREEBSD_ABI_DESC = 3;
248
249 Elf_Brandnote __elfN(kfreebsd_brandnote) = {
250 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR),
251 .hdr.n_descsz = 16, /* XXX at least 16 */
252 .hdr.n_type = 1,
253 .vendor = GNU_ABI_VENDOR,
254 .flags = BN_TRANSLATE_OSREL,
255 .trans_osrel = kfreebsd_trans_osrel
256 };
257
258 static bool
259 kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel)
260 {
261 const Elf32_Word *desc;
262 uintptr_t p;
263
264 p = (uintptr_t)(note + 1);
265 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
266
267 desc = (const Elf32_Word *)p;
268 if (desc[0] != GNU_KFREEBSD_ABI_DESC)
269 return (false);
270
271 /*
272 * Debian GNU/kFreeBSD embed the earliest compatible kernel version
273 * (__FreeBSD_version: <major><two digit minor>Rxx) in the LSB way.
274 */
275 *osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3];
276
277 return (true);
278 }
279
280 int
281 __elfN(insert_brand_entry)(Elf_Brandinfo *entry)
282 {
283 int i;
284
285 for (i = 0; i < MAX_BRANDS; i++) {
286 if (elf_brand_list[i] == NULL) {
287 elf_brand_list[i] = entry;
288 break;
289 }
290 }
291 if (i == MAX_BRANDS) {
292 printf("WARNING: %s: could not insert brandinfo entry: %p\n",
293 __func__, entry);
294 return (-1);
295 }
296 return (0);
297 }
298
299 int
300 __elfN(remove_brand_entry)(Elf_Brandinfo *entry)
301 {
302 int i;
303
304 for (i = 0; i < MAX_BRANDS; i++) {
305 if (elf_brand_list[i] == entry) {
306 elf_brand_list[i] = NULL;
307 break;
308 }
309 }
310 if (i == MAX_BRANDS)
311 return (-1);
312 return (0);
313 }
314
315 int
316 __elfN(brand_inuse)(Elf_Brandinfo *entry)
317 {
318 struct proc *p;
319 int rval = FALSE;
320
321 sx_slock(&allproc_lock);
322 FOREACH_PROC_IN_SYSTEM(p) {
323 if (p->p_sysent == entry->sysvec) {
324 rval = TRUE;
325 break;
326 }
327 }
328 sx_sunlock(&allproc_lock);
329
330 return (rval);
331 }
332
333 static Elf_Brandinfo *
334 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp,
335 int32_t *osrel, uint32_t *fctl0)
336 {
337 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
338 Elf_Brandinfo *bi, *bi_m;
339 boolean_t ret, has_fctl0;
340 int i, interp_name_len;
341
342 interp_name_len = interp != NULL ? strlen(interp) + 1 : 0;
343
344 /*
345 * We support four types of branding -- (1) the ELF EI_OSABI field
346 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string
347 * branding w/in the ELF header, (3) path of the `interp_path'
348 * field, and (4) the ".note.ABI-tag" ELF section.
349 */
350
351 /* Look for an ".note.ABI-tag" ELF section */
352 bi_m = NULL;
353 for (i = 0; i < MAX_BRANDS; i++) {
354 bi = elf_brand_list[i];
355 if (bi == NULL)
356 continue;
357 if (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0)
358 continue;
359 if (hdr->e_machine == bi->machine && (bi->flags &
360 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) {
361 has_fctl0 = false;
362 *fctl0 = 0;
363 *osrel = 0;
364 ret = __elfN(check_note)(imgp, bi->brand_note, osrel,
365 &has_fctl0, fctl0);
366 /* Give brand a chance to veto check_note's guess */
367 if (ret && bi->header_supported) {
368 ret = bi->header_supported(imgp, osrel,
369 has_fctl0 ? fctl0 : NULL);
370 }
371 /*
372 * If note checker claimed the binary, but the
373 * interpreter path in the image does not
374 * match default one for the brand, try to
375 * search for other brands with the same
376 * interpreter. Either there is better brand
377 * with the right interpreter, or, failing
378 * this, we return first brand which accepted
379 * our note and, optionally, header.
380 */
381 if (ret && bi_m == NULL && interp != NULL &&
382 (bi->interp_path == NULL ||
383 (strlen(bi->interp_path) + 1 != interp_name_len ||
384 strncmp(interp, bi->interp_path, interp_name_len)
385 != 0))) {
386 bi_m = bi;
387 ret = 0;
388 }
389 if (ret)
390 return (bi);
391 }
392 }
393 if (bi_m != NULL)
394 return (bi_m);
395
396 /* If the executable has a brand, search for it in the brand list. */
397 for (i = 0; i < MAX_BRANDS; i++) {
398 bi = elf_brand_list[i];
399 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 ||
400 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0))
401 continue;
402 if (hdr->e_machine == bi->machine &&
403 (hdr->e_ident[EI_OSABI] == bi->brand ||
404 (bi->compat_3_brand != NULL &&
405 strcmp((const char *)&hdr->e_ident[OLD_EI_BRAND],
406 bi->compat_3_brand) == 0))) {
407 /* Looks good, but give brand a chance to veto */
408 if (bi->header_supported == NULL ||
409 bi->header_supported(imgp, NULL, NULL)) {
410 /*
411 * Again, prefer strictly matching
412 * interpreter path.
413 */
414 if (interp_name_len == 0 &&
415 bi->interp_path == NULL)
416 return (bi);
417 if (bi->interp_path != NULL &&
418 strlen(bi->interp_path) + 1 ==
419 interp_name_len && strncmp(interp,
420 bi->interp_path, interp_name_len) == 0)
421 return (bi);
422 if (bi_m == NULL)
423 bi_m = bi;
424 }
425 }
426 }
427 if (bi_m != NULL)
428 return (bi_m);
429
430 /* No known brand, see if the header is recognized by any brand */
431 for (i = 0; i < MAX_BRANDS; i++) {
432 bi = elf_brand_list[i];
433 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY ||
434 bi->header_supported == NULL)
435 continue;
436 if (hdr->e_machine == bi->machine) {
437 ret = bi->header_supported(imgp, NULL, NULL);
438 if (ret)
439 return (bi);
440 }
441 }
442
443 /* Lacking a known brand, search for a recognized interpreter. */
444 if (interp != NULL) {
445 for (i = 0; i < MAX_BRANDS; i++) {
446 bi = elf_brand_list[i];
447 if (bi == NULL || (bi->flags &
448 (BI_BRAND_NOTE_MANDATORY | BI_BRAND_ONLY_STATIC))
449 != 0)
450 continue;
451 if (hdr->e_machine == bi->machine &&
452 bi->interp_path != NULL &&
453 /* ELF image p_filesz includes terminating zero */
454 strlen(bi->interp_path) + 1 == interp_name_len &&
455 strncmp(interp, bi->interp_path, interp_name_len)
456 == 0 && (bi->header_supported == NULL ||
457 bi->header_supported(imgp, NULL, NULL)))
458 return (bi);
459 }
460 }
461
462 /* Lacking a recognized interpreter, try the default brand */
463 for (i = 0; i < MAX_BRANDS; i++) {
464 bi = elf_brand_list[i];
465 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 ||
466 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0))
467 continue;
468 if (hdr->e_machine == bi->machine &&
469 __elfN(fallback_brand) == bi->brand &&
470 (bi->header_supported == NULL ||
471 bi->header_supported(imgp, NULL, NULL)))
472 return (bi);
473 }
474 return (NULL);
475 }
476
477 static bool
478 __elfN(phdr_in_zero_page)(const Elf_Ehdr *hdr)
479 {
480 return (hdr->e_phoff <= PAGE_SIZE &&
481 (u_int)hdr->e_phentsize * hdr->e_phnum <= PAGE_SIZE - hdr->e_phoff);
482 }
483
484 static int
485 __elfN(check_header)(const Elf_Ehdr *hdr)
486 {
487 Elf_Brandinfo *bi;
488 int i;
489
490 if (!IS_ELF(*hdr) ||
491 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
492 hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
493 hdr->e_ident[EI_VERSION] != EV_CURRENT ||
494 hdr->e_phentsize != sizeof(Elf_Phdr) ||
495 hdr->e_version != ELF_TARG_VER)
496 return (ENOEXEC);
497
498 /*
499 * Make sure we have at least one brand for this machine.
500 */
501
502 for (i = 0; i < MAX_BRANDS; i++) {
503 bi = elf_brand_list[i];
504 if (bi != NULL && bi->machine == hdr->e_machine)
505 break;
506 }
507 if (i == MAX_BRANDS)
508 return (ENOEXEC);
509
510 return (0);
511 }
512
513 static int
514 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
515 vm_offset_t start, vm_offset_t end, vm_prot_t prot)
516 {
517 struct sf_buf *sf;
518 int error;
519 vm_offset_t off;
520
521 /*
522 * Create the page if it doesn't exist yet. Ignore errors.
523 */
524 vm_map_fixed(map, NULL, 0, trunc_page(start), round_page(end) -
525 trunc_page(start), VM_PROT_ALL, VM_PROT_ALL, MAP_CHECK_EXCL);
526
527 /*
528 * Find the page from the underlying object.
529 */
530 if (object != NULL) {
531 sf = vm_imgact_map_page(object, offset);
532 if (sf == NULL)
533 return (KERN_FAILURE);
534 off = offset - trunc_page(offset);
535 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start,
536 end - start);
537 vm_imgact_unmap_page(sf);
538 if (error != 0)
539 return (KERN_FAILURE);
540 }
541
542 return (KERN_SUCCESS);
543 }
544
545 static int
546 __elfN(map_insert)(struct image_params *imgp, vm_map_t map, vm_object_t object,
547 vm_ooffset_t offset, vm_offset_t start, vm_offset_t end, vm_prot_t prot,
548 int cow)
549 {
550 struct sf_buf *sf;
551 vm_offset_t off;
552 vm_size_t sz;
553 int error, locked, rv;
554
555 if (start != trunc_page(start)) {
556 rv = __elfN(map_partial)(map, object, offset, start,
557 round_page(start), prot);
558 if (rv != KERN_SUCCESS)
559 return (rv);
560 offset += round_page(start) - start;
561 start = round_page(start);
562 }
563 if (end != round_page(end)) {
564 rv = __elfN(map_partial)(map, object, offset +
565 trunc_page(end) - start, trunc_page(end), end, prot);
566 if (rv != KERN_SUCCESS)
567 return (rv);
568 end = trunc_page(end);
569 }
570 if (start >= end)
571 return (KERN_SUCCESS);
572 if ((offset & PAGE_MASK) != 0) {
573 /*
574 * The mapping is not page aligned. This means that we have
575 * to copy the data.
576 */
577 rv = vm_map_fixed(map, NULL, 0, start, end - start,
578 prot | VM_PROT_WRITE, VM_PROT_ALL, MAP_CHECK_EXCL);
579 if (rv != KERN_SUCCESS)
580 return (rv);
581 if (object == NULL)
582 return (KERN_SUCCESS);
583 for (; start < end; start += sz) {
584 sf = vm_imgact_map_page(object, offset);
585 if (sf == NULL)
586 return (KERN_FAILURE);
587 off = offset - trunc_page(offset);
588 sz = end - start;
589 if (sz > PAGE_SIZE - off)
590 sz = PAGE_SIZE - off;
591 error = copyout((caddr_t)sf_buf_kva(sf) + off,
592 (caddr_t)start, sz);
593 vm_imgact_unmap_page(sf);
594 if (error != 0)
595 return (KERN_FAILURE);
596 offset += sz;
597 }
598 } else {
599 vm_object_reference(object);
600 rv = vm_map_fixed(map, object, offset, start, end - start,
601 prot, VM_PROT_ALL, cow | MAP_CHECK_EXCL |
602 (object != NULL ? MAP_VN_EXEC : 0));
603 if (rv != KERN_SUCCESS) {
604 locked = VOP_ISLOCKED(imgp->vp);
605 VOP_UNLOCK(imgp->vp);
606 vm_object_deallocate(object);
607 vn_lock(imgp->vp, locked | LK_RETRY);
608 return (rv);
609 } else if (object != NULL) {
610 MPASS(imgp->vp->v_object == object);
611 VOP_SET_TEXT_CHECKED(imgp->vp);
612 }
613 }
614 return (KERN_SUCCESS);
615 }
616
617 static int
618 __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset,
619 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot)
620 {
621 struct sf_buf *sf;
622 size_t map_len;
623 vm_map_t map;
624 vm_object_t object;
625 vm_offset_t map_addr;
626 int error, rv, cow;
627 size_t copy_len;
628 vm_ooffset_t file_addr;
629
630 /*
631 * It's necessary to fail if the filsz + offset taken from the
632 * header is greater than the actual file pager object's size.
633 * If we were to allow this, then the vm_map_find() below would
634 * walk right off the end of the file object and into the ether.
635 *
636 * While I'm here, might as well check for something else that
637 * is invalid: filsz cannot be greater than memsz.
638 */
639 if ((filsz != 0 && (off_t)filsz + offset > imgp->attr->va_size) ||
640 filsz > memsz) {
641 uprintf("elf_load_section: truncated ELF file\n");
642 return (ENOEXEC);
643 }
644
645 object = imgp->object;
646 map = &imgp->proc->p_vmspace->vm_map;
647 map_addr = trunc_page((vm_offset_t)vmaddr);
648 file_addr = trunc_page(offset);
649
650 /*
651 * We have two choices. We can either clear the data in the last page
652 * of an oversized mapping, or we can start the anon mapping a page
653 * early and copy the initialized data into that first page. We
654 * choose the second.
655 */
656 if (filsz == 0)
657 map_len = 0;
658 else if (memsz > filsz)
659 map_len = trunc_page(offset + filsz) - file_addr;
660 else
661 map_len = round_page(offset + filsz) - file_addr;
662
663 if (map_len != 0) {
664 /* cow flags: don't dump readonly sections in core */
665 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT |
666 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP);
667
668 rv = __elfN(map_insert)(imgp, map, object, file_addr,
669 map_addr, map_addr + map_len, prot, cow);
670 if (rv != KERN_SUCCESS)
671 return (EINVAL);
672
673 /* we can stop now if we've covered it all */
674 if (memsz == filsz)
675 return (0);
676 }
677
678 /*
679 * We have to get the remaining bit of the file into the first part
680 * of the oversized map segment. This is normally because the .data
681 * segment in the file is extended to provide bss. It's a neat idea
682 * to try and save a page, but it's a pain in the behind to implement.
683 */
684 copy_len = filsz == 0 ? 0 : (offset + filsz) - trunc_page(offset +
685 filsz);
686 map_addr = trunc_page((vm_offset_t)vmaddr + filsz);
687 map_len = round_page((vm_offset_t)vmaddr + memsz) - map_addr;
688
689 /* This had damn well better be true! */
690 if (map_len != 0) {
691 rv = __elfN(map_insert)(imgp, map, NULL, 0, map_addr,
692 map_addr + map_len, prot, 0);
693 if (rv != KERN_SUCCESS)
694 return (EINVAL);
695 }
696
697 if (copy_len != 0) {
698 sf = vm_imgact_map_page(object, offset + filsz);
699 if (sf == NULL)
700 return (EIO);
701
702 /* send the page fragment to user space */
703 error = copyout((caddr_t)sf_buf_kva(sf), (caddr_t)map_addr,
704 copy_len);
705 vm_imgact_unmap_page(sf);
706 if (error != 0)
707 return (error);
708 }
709
710 /*
711 * Remove write access to the page if it was only granted by map_insert
712 * to allow copyout.
713 */
714 if ((prot & VM_PROT_WRITE) == 0)
715 vm_map_protect(map, trunc_page(map_addr), round_page(map_addr +
716 map_len), prot, 0, VM_MAP_PROTECT_SET_PROT);
717
718 return (0);
719 }
720
721 static int
722 __elfN(load_sections)(struct image_params *imgp, const Elf_Ehdr *hdr,
723 const Elf_Phdr *phdr, u_long rbase, u_long *base_addrp)
724 {
725 vm_prot_t prot;
726 u_long base_addr;
727 bool first;
728 int error, i;
729
730 ASSERT_VOP_LOCKED(imgp->vp, __func__);
731
732 base_addr = 0;
733 first = true;
734
735 for (i = 0; i < hdr->e_phnum; i++) {
736 if (phdr[i].p_type != PT_LOAD || phdr[i].p_memsz == 0)
737 continue;
738
739 /* Loadable segment */
740 prot = __elfN(trans_prot)(phdr[i].p_flags);
741 error = __elfN(load_section)(imgp, phdr[i].p_offset,
742 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase,
743 phdr[i].p_memsz, phdr[i].p_filesz, prot);
744 if (error != 0)
745 return (error);
746
747 /*
748 * Establish the base address if this is the first segment.
749 */
750 if (first) {
751 base_addr = trunc_page(phdr[i].p_vaddr + rbase);
752 first = false;
753 }
754 }
755
756 if (base_addrp != NULL)
757 *base_addrp = base_addr;
758
759 return (0);
760 }
761
762 /*
763 * Load the file "file" into memory. It may be either a shared object
764 * or an executable.
765 *
766 * The "addr" reference parameter is in/out. On entry, it specifies
767 * the address where a shared object should be loaded. If the file is
768 * an executable, this value is ignored. On exit, "addr" specifies
769 * where the file was actually loaded.
770 *
771 * The "entry" reference parameter is out only. On exit, it specifies
772 * the entry point for the loaded file.
773 */
774 static int
775 __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
776 u_long *entry)
777 {
778 struct {
779 struct nameidata nd;
780 struct vattr attr;
781 struct image_params image_params;
782 } *tempdata;
783 const Elf_Ehdr *hdr = NULL;
784 const Elf_Phdr *phdr = NULL;
785 struct nameidata *nd;
786 struct vattr *attr;
787 struct image_params *imgp;
788 u_long rbase;
789 u_long base_addr = 0;
790 int error;
791
792 #ifdef CAPABILITY_MODE
793 /*
794 * XXXJA: This check can go away once we are sufficiently confident
795 * that the checks in namei() are correct.
796 */
797 if (IN_CAPABILITY_MODE(curthread))
798 return (ECAPMODE);
799 #endif
800
801 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK | M_ZERO);
802 nd = &tempdata->nd;
803 attr = &tempdata->attr;
804 imgp = &tempdata->image_params;
805
806 /*
807 * Initialize part of the common data
808 */
809 imgp->proc = p;
810 imgp->attr = attr;
811
812 NDINIT(nd, LOOKUP, ISOPEN | FOLLOW | LOCKSHARED | LOCKLEAF,
813 UIO_SYSSPACE, file, curthread);
814 if ((error = namei(nd)) != 0) {
815 nd->ni_vp = NULL;
816 goto fail;
817 }
818 NDFREE(nd, NDF_ONLY_PNBUF);
819 imgp->vp = nd->ni_vp;
820
821 /*
822 * Check permissions, modes, uid, etc on the file, and "open" it.
823 */
824 error = exec_check_permissions(imgp);
825 if (error)
826 goto fail;
827
828 error = exec_map_first_page(imgp);
829 if (error)
830 goto fail;
831
832 imgp->object = nd->ni_vp->v_object;
833
834 hdr = (const Elf_Ehdr *)imgp->image_header;
835 if ((error = __elfN(check_header)(hdr)) != 0)
836 goto fail;
837 if (hdr->e_type == ET_DYN)
838 rbase = *addr;
839 else if (hdr->e_type == ET_EXEC)
840 rbase = 0;
841 else {
842 error = ENOEXEC;
843 goto fail;
844 }
845
846 /* Only support headers that fit within first page for now */
847 if (!__elfN(phdr_in_zero_page)(hdr)) {
848 error = ENOEXEC;
849 goto fail;
850 }
851
852 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
853 if (!aligned(phdr, Elf_Addr)) {
854 error = ENOEXEC;
855 goto fail;
856 }
857
858 error = __elfN(load_sections)(imgp, hdr, phdr, rbase, &base_addr);
859 if (error != 0)
860 goto fail;
861
862 *addr = base_addr;
863 *entry = (unsigned long)hdr->e_entry + rbase;
864
865 fail:
866 if (imgp->firstpage)
867 exec_unmap_first_page(imgp);
868
869 if (nd->ni_vp) {
870 if (imgp->textset)
871 VOP_UNSET_TEXT_CHECKED(nd->ni_vp);
872 vput(nd->ni_vp);
873 }
874 free(tempdata, M_TEMP);
875
876 return (error);
877 }
878
879 /*
880 * Select randomized valid address in the map map, between minv and
881 * maxv, with specified alignment. The [minv, maxv) range must belong
882 * to the map. Note that function only allocates the address, it is
883 * up to caller to clamp maxv in a way that the final allocation
884 * length fit into the map.
885 *
886 * Result is returned in *resp, error code indicates that arguments
887 * did not pass sanity checks for overflow and range correctness.
888 */
889 static int
890 __CONCAT(rnd_, __elfN(base))(vm_map_t map, u_long minv, u_long maxv,
891 u_int align, u_long *resp)
892 {
893 u_long rbase, res;
894
895 MPASS(vm_map_min(map) <= minv);
896
897 if (minv >= maxv || minv + align >= maxv || maxv > vm_map_max(map)) {
898 uprintf("Invalid ELF segments layout\n");
899 return (ENOEXEC);
900 }
901
902 arc4rand(&rbase, sizeof(rbase), 0);
903 res = roundup(minv, (u_long)align) + rbase % (maxv - minv);
904 res &= ~((u_long)align - 1);
905 if (res >= maxv)
906 res -= align;
907
908 KASSERT(res >= minv,
909 ("res %#lx < minv %#lx, maxv %#lx rbase %#lx",
910 res, minv, maxv, rbase));
911 KASSERT(res < maxv,
912 ("res %#lx > maxv %#lx, minv %#lx rbase %#lx",
913 res, maxv, minv, rbase));
914
915 *resp = res;
916 return (0);
917 }
918
919 static int
920 __elfN(enforce_limits)(struct image_params *imgp, const Elf_Ehdr *hdr,
921 const Elf_Phdr *phdr, u_long et_dyn_addr)
922 {
923 struct vmspace *vmspace;
924 const char *err_str;
925 u_long text_size, data_size, total_size, text_addr, data_addr;
926 u_long seg_size, seg_addr;
927 int i;
928
929 err_str = NULL;
930 text_size = data_size = total_size = text_addr = data_addr = 0;
931
932 for (i = 0; i < hdr->e_phnum; i++) {
933 if (phdr[i].p_type != PT_LOAD || phdr[i].p_memsz == 0)
934 continue;
935
936 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr);
937 seg_size = round_page(phdr[i].p_memsz +
938 phdr[i].p_vaddr + et_dyn_addr - seg_addr);
939
940 /*
941 * Make the largest executable segment the official
942 * text segment and all others data.
943 *
944 * Note that obreak() assumes that data_addr + data_size == end
945 * of data load area, and the ELF file format expects segments
946 * to be sorted by address. If multiple data segments exist,
947 * the last one will be used.
948 */
949
950 if ((phdr[i].p_flags & PF_X) != 0 && text_size < seg_size) {
951 text_size = seg_size;
952 text_addr = seg_addr;
953 } else {
954 data_size = seg_size;
955 data_addr = seg_addr;
956 }
957 total_size += seg_size;
958 }
959
960 if (data_addr == 0 && data_size == 0) {
961 data_addr = text_addr;
962 data_size = text_size;
963 }
964
965 /*
966 * Check limits. It should be safe to check the
967 * limits after loading the segments since we do
968 * not actually fault in all the segments pages.
969 */
970 PROC_LOCK(imgp->proc);
971 if (data_size > lim_cur_proc(imgp->proc, RLIMIT_DATA))
972 err_str = "Data segment size exceeds process limit";
973 else if (text_size > maxtsiz)
974 err_str = "Text segment size exceeds system limit";
975 else if (total_size > lim_cur_proc(imgp->proc, RLIMIT_VMEM))
976 err_str = "Total segment size exceeds process limit";
977 else if (racct_set(imgp->proc, RACCT_DATA, data_size) != 0)
978 err_str = "Data segment size exceeds resource limit";
979 else if (racct_set(imgp->proc, RACCT_VMEM, total_size) != 0)
980 err_str = "Total segment size exceeds resource limit";
981 PROC_UNLOCK(imgp->proc);
982 if (err_str != NULL) {
983 uprintf("%s\n", err_str);
984 return (ENOMEM);
985 }
986
987 vmspace = imgp->proc->p_vmspace;
988 vmspace->vm_tsize = text_size >> PAGE_SHIFT;
989 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr;
990 vmspace->vm_dsize = data_size >> PAGE_SHIFT;
991 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr;
992
993 return (0);
994 }
995
996 static int
997 __elfN(get_interp)(struct image_params *imgp, const Elf_Phdr *phdr,
998 char **interpp, bool *free_interpp)
999 {
1000 struct thread *td;
1001 char *interp;
1002 int error, interp_name_len;
1003
1004 KASSERT(phdr->p_type == PT_INTERP,
1005 ("%s: p_type %u != PT_INTERP", __func__, phdr->p_type));
1006 ASSERT_VOP_LOCKED(imgp->vp, __func__);
1007
1008 td = curthread;
1009
1010 /* Path to interpreter */
1011 if (phdr->p_filesz < 2 || phdr->p_filesz > MAXPATHLEN) {
1012 uprintf("Invalid PT_INTERP\n");
1013 return (ENOEXEC);
1014 }
1015
1016 interp_name_len = phdr->p_filesz;
1017 if (phdr->p_offset > PAGE_SIZE ||
1018 interp_name_len > PAGE_SIZE - phdr->p_offset) {
1019 /*
1020 * The vnode lock might be needed by the pagedaemon to
1021 * clean pages owned by the vnode. Do not allow sleep
1022 * waiting for memory with the vnode locked, instead
1023 * try non-sleepable allocation first, and if it
1024 * fails, go to the slow path were we drop the lock
1025 * and do M_WAITOK. A text reference prevents
1026 * modifications to the vnode content.
1027 */
1028 interp = malloc(interp_name_len + 1, M_TEMP, M_NOWAIT);
1029 if (interp == NULL) {
1030 VOP_UNLOCK(imgp->vp);
1031 interp = malloc(interp_name_len + 1, M_TEMP, M_WAITOK);
1032 vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
1033 }
1034
1035 error = vn_rdwr(UIO_READ, imgp->vp, interp,
1036 interp_name_len, phdr->p_offset,
1037 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
1038 NOCRED, NULL, td);
1039 if (error != 0) {
1040 free(interp, M_TEMP);
1041 uprintf("i/o error PT_INTERP %d\n", error);
1042 return (error);
1043 }
1044 interp[interp_name_len] = '\0';
1045
1046 *interpp = interp;
1047 *free_interpp = true;
1048 return (0);
1049 }
1050
1051 interp = __DECONST(char *, imgp->image_header) + phdr->p_offset;
1052 if (interp[interp_name_len - 1] != '\0') {
1053 uprintf("Invalid PT_INTERP\n");
1054 return (ENOEXEC);
1055 }
1056
1057 *interpp = interp;
1058 *free_interpp = false;
1059 return (0);
1060 }
1061
1062 static int
1063 __elfN(load_interp)(struct image_params *imgp, const Elf_Brandinfo *brand_info,
1064 const char *interp, u_long *addr, u_long *entry)
1065 {
1066 char *path;
1067 int error;
1068
1069 if (brand_info->emul_path != NULL &&
1070 brand_info->emul_path[0] != '\0') {
1071 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1072 snprintf(path, MAXPATHLEN, "%s%s",
1073 brand_info->emul_path, interp);
1074 error = __elfN(load_file)(imgp->proc, path, addr, entry);
1075 free(path, M_TEMP);
1076 if (error == 0)
1077 return (0);
1078 }
1079
1080 if (brand_info->interp_newpath != NULL &&
1081 (brand_info->interp_path == NULL ||
1082 strcmp(interp, brand_info->interp_path) == 0)) {
1083 error = __elfN(load_file)(imgp->proc,
1084 brand_info->interp_newpath, addr, entry);
1085 if (error == 0)
1086 return (0);
1087 }
1088
1089 error = __elfN(load_file)(imgp->proc, interp, addr, entry);
1090 if (error == 0)
1091 return (0);
1092
1093 uprintf("ELF interpreter %s not found, error %d\n", interp, error);
1094 return (error);
1095 }
1096
1097 /*
1098 * Impossible et_dyn_addr initial value indicating that the real base
1099 * must be calculated later with some randomization applied.
1100 */
1101 #define ET_DYN_ADDR_RAND 1
1102
1103 static int
1104 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp)
1105 {
1106 struct thread *td;
1107 const Elf_Ehdr *hdr;
1108 const Elf_Phdr *phdr;
1109 Elf_Auxargs *elf_auxargs;
1110 struct vmspace *vmspace;
1111 vm_map_t map;
1112 char *interp;
1113 Elf_Brandinfo *brand_info;
1114 struct sysentvec *sv;
1115 u_long addr, baddr, et_dyn_addr, entry, proghdr;
1116 u_long maxalign, maxsalign, mapsz, maxv, maxv1, anon_loc;
1117 uint32_t fctl0;
1118 int32_t osrel;
1119 bool free_interp;
1120 int error, i, n;
1121
1122 hdr = (const Elf_Ehdr *)imgp->image_header;
1123
1124 /*
1125 * Do we have a valid ELF header ?
1126 *
1127 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later
1128 * if particular brand doesn't support it.
1129 */
1130 if (__elfN(check_header)(hdr) != 0 ||
1131 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN))
1132 return (-1);
1133
1134 /*
1135 * From here on down, we return an errno, not -1, as we've
1136 * detected an ELF file.
1137 */
1138
1139 if (!__elfN(phdr_in_zero_page)(hdr)) {
1140 uprintf("Program headers not in the first page\n");
1141 return (ENOEXEC);
1142 }
1143 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
1144 if (!aligned(phdr, Elf_Addr)) {
1145 uprintf("Unaligned program headers\n");
1146 return (ENOEXEC);
1147 }
1148
1149 n = error = 0;
1150 baddr = 0;
1151 osrel = 0;
1152 fctl0 = 0;
1153 entry = proghdr = 0;
1154 interp = NULL;
1155 free_interp = false;
1156 td = curthread;
1157
1158 /*
1159 * Somewhat arbitrary, limit accepted max alignment for the
1160 * loadable segment to the max supported superpage size. Too
1161 * large alignment requests are not useful and are indicators
1162 * of corrupted or outright malicious binary.
1163 */
1164 maxalign = PAGE_SIZE;
1165 maxsalign = PAGE_SIZE * 1024;
1166 for (i = MAXPAGESIZES - 1; i > 0; i--) {
1167 if (pagesizes[i] > maxsalign)
1168 maxsalign = pagesizes[i];
1169 }
1170
1171 mapsz = 0;
1172
1173 for (i = 0; i < hdr->e_phnum; i++) {
1174 switch (phdr[i].p_type) {
1175 case PT_LOAD:
1176 if (n == 0)
1177 baddr = phdr[i].p_vaddr;
1178 if (!powerof2(phdr[i].p_align) ||
1179 phdr[i].p_align > maxsalign) {
1180 uprintf("Invalid segment alignment\n");
1181 error = ENOEXEC;
1182 goto ret;
1183 }
1184 if (phdr[i].p_align > maxalign)
1185 maxalign = phdr[i].p_align;
1186 if (mapsz + phdr[i].p_memsz < mapsz) {
1187 uprintf("Mapsize overflow\n");
1188 error = ENOEXEC;
1189 goto ret;
1190 }
1191 mapsz += phdr[i].p_memsz;
1192 n++;
1193
1194 /*
1195 * If this segment contains the program headers,
1196 * remember their virtual address for the AT_PHDR
1197 * aux entry. Static binaries don't usually include
1198 * a PT_PHDR entry.
1199 */
1200 if (phdr[i].p_offset == 0 &&
1201 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize <=
1202 phdr[i].p_filesz)
1203 proghdr = phdr[i].p_vaddr + hdr->e_phoff;
1204 break;
1205 case PT_INTERP:
1206 /* Path to interpreter */
1207 if (interp != NULL) {
1208 uprintf("Multiple PT_INTERP headers\n");
1209 error = ENOEXEC;
1210 goto ret;
1211 }
1212 error = __elfN(get_interp)(imgp, &phdr[i], &interp,
1213 &free_interp);
1214 if (error != 0)
1215 goto ret;
1216 break;
1217 case PT_GNU_STACK:
1218 if (__elfN(nxstack)) {
1219 imgp->stack_prot =
1220 __elfN(trans_prot)(phdr[i].p_flags);
1221 if ((imgp->stack_prot & VM_PROT_RW) !=
1222 VM_PROT_RW) {
1223 uprintf("Invalid PT_GNU_STACK\n");
1224 error = ENOEXEC;
1225 goto ret;
1226 }
1227 }
1228 imgp->stack_sz = phdr[i].p_memsz;
1229 break;
1230 case PT_PHDR: /* Program header table info */
1231 proghdr = phdr[i].p_vaddr;
1232 break;
1233 }
1234 }
1235
1236 brand_info = __elfN(get_brandinfo)(imgp, interp, &osrel, &fctl0);
1237 if (brand_info == NULL) {
1238 uprintf("ELF binary type \"%u\" not known.\n",
1239 hdr->e_ident[EI_OSABI]);
1240 error = ENOEXEC;
1241 goto ret;
1242 }
1243 sv = brand_info->sysvec;
1244 et_dyn_addr = 0;
1245 if (hdr->e_type == ET_DYN) {
1246 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) {
1247 uprintf("Cannot execute shared object\n");
1248 error = ENOEXEC;
1249 goto ret;
1250 }
1251 /*
1252 * Honour the base load address from the dso if it is
1253 * non-zero for some reason.
1254 */
1255 if (baddr == 0) {
1256 if ((sv->sv_flags & SV_ASLR) == 0 ||
1257 (fctl0 & NT_FREEBSD_FCTL_ASLR_DISABLE) != 0)
1258 et_dyn_addr = __elfN(pie_base);
1259 else if ((__elfN(pie_aslr_enabled) &&
1260 (imgp->proc->p_flag2 & P2_ASLR_DISABLE) == 0) ||
1261 (imgp->proc->p_flag2 & P2_ASLR_ENABLE) != 0)
1262 et_dyn_addr = ET_DYN_ADDR_RAND;
1263 else
1264 et_dyn_addr = __elfN(pie_base);
1265 }
1266 }
1267
1268 /*
1269 * Avoid a possible deadlock if the current address space is destroyed
1270 * and that address space maps the locked vnode. In the common case,
1271 * the locked vnode's v_usecount is decremented but remains greater
1272 * than zero. Consequently, the vnode lock is not needed by vrele().
1273 * However, in cases where the vnode lock is external, such as nullfs,
1274 * v_usecount may become zero.
1275 *
1276 * The VV_TEXT flag prevents modifications to the executable while
1277 * the vnode is unlocked.
1278 */
1279 VOP_UNLOCK(imgp->vp);
1280
1281 /*
1282 * Decide whether to enable randomization of user mappings.
1283 * First, reset user preferences for the setid binaries.
1284 * Then, account for the support of the randomization by the
1285 * ABI, by user preferences, and make special treatment for
1286 * PIE binaries.
1287 */
1288 if (imgp->credential_setid) {
1289 PROC_LOCK(imgp->proc);
1290 imgp->proc->p_flag2 &= ~(P2_ASLR_ENABLE | P2_ASLR_DISABLE |
1291 P2_WXORX_DISABLE | P2_WXORX_ENABLE_EXEC);
1292 PROC_UNLOCK(imgp->proc);
1293 }
1294 if ((sv->sv_flags & SV_ASLR) == 0 ||
1295 (imgp->proc->p_flag2 & P2_ASLR_DISABLE) != 0 ||
1296 (fctl0 & NT_FREEBSD_FCTL_ASLR_DISABLE) != 0) {
1297 KASSERT(et_dyn_addr != ET_DYN_ADDR_RAND,
1298 ("et_dyn_addr == RAND and !ASLR"));
1299 } else if ((imgp->proc->p_flag2 & P2_ASLR_ENABLE) != 0 ||
1300 (__elfN(aslr_enabled) && hdr->e_type == ET_EXEC) ||
1301 et_dyn_addr == ET_DYN_ADDR_RAND) {
1302 imgp->map_flags |= MAP_ASLR;
1303 /*
1304 * If user does not care about sbrk, utilize the bss
1305 * grow region for mappings as well. We can select
1306 * the base for the image anywere and still not suffer
1307 * from the fragmentation.
1308 */
1309 if (!__elfN(aslr_honor_sbrk) ||
1310 (imgp->proc->p_flag2 & P2_ASLR_IGNSTART) != 0)
1311 imgp->map_flags |= MAP_ASLR_IGNSTART;
1312 if (__elfN(aslr_stack))
1313 imgp->map_flags |= MAP_ASLR_STACK;
1314 }
1315
1316 if ((!__elfN(allow_wx) && (fctl0 & NT_FREEBSD_FCTL_WXNEEDED) == 0 &&
1317 (imgp->proc->p_flag2 & P2_WXORX_DISABLE) == 0) ||
1318 (imgp->proc->p_flag2 & P2_WXORX_ENABLE_EXEC) != 0)
1319 imgp->map_flags |= MAP_WXORX;
1320
1321 error = exec_new_vmspace(imgp, sv);
1322
1323 imgp->proc->p_sysent = sv;
1324 imgp->proc->p_elf_brandinfo = brand_info;
1325
1326 vmspace = imgp->proc->p_vmspace;
1327 map = &vmspace->vm_map;
1328 maxv = sv->sv_usrstack;
1329 if ((imgp->map_flags & MAP_ASLR_STACK) == 0)
1330 maxv -= lim_max(td, RLIMIT_STACK);
1331 if (error == 0 && mapsz >= maxv - vm_map_min(map)) {
1332 uprintf("Excessive mapping size\n");
1333 error = ENOEXEC;
1334 }
1335
1336 if (error == 0 && et_dyn_addr == ET_DYN_ADDR_RAND) {
1337 KASSERT((map->flags & MAP_ASLR) != 0,
1338 ("ET_DYN_ADDR_RAND but !MAP_ASLR"));
1339 error = __CONCAT(rnd_, __elfN(base))(map,
1340 vm_map_min(map) + mapsz + lim_max(td, RLIMIT_DATA),
1341 /* reserve half of the address space to interpreter */
1342 maxv / 2, maxalign, &et_dyn_addr);
1343 }
1344
1345 vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
1346 if (error != 0)
1347 goto ret;
1348
1349 error = __elfN(load_sections)(imgp, hdr, phdr, et_dyn_addr, NULL);
1350 if (error != 0)
1351 goto ret;
1352
1353 error = __elfN(enforce_limits)(imgp, hdr, phdr, et_dyn_addr);
1354 if (error != 0)
1355 goto ret;
1356
1357 /*
1358 * We load the dynamic linker where a userland call
1359 * to mmap(0, ...) would put it. The rationale behind this
1360 * calculation is that it leaves room for the heap to grow to
1361 * its maximum allowed size.
1362 */
1363 addr = round_page((vm_offset_t)vmspace->vm_daddr + lim_max(td,
1364 RLIMIT_DATA));
1365 if ((map->flags & MAP_ASLR) != 0) {
1366 maxv1 = maxv / 2 + addr / 2;
1367 error = __CONCAT(rnd_, __elfN(base))(map, addr, maxv1,
1368 (MAXPAGESIZES > 1 && pagesizes[1] != 0) ?
1369 pagesizes[1] : pagesizes[0], &anon_loc);
1370 if (error != 0)
1371 goto ret;
1372 map->anon_loc = anon_loc;
1373 } else {
1374 map->anon_loc = addr;
1375 }
1376
1377 entry = (u_long)hdr->e_entry + et_dyn_addr;
1378 imgp->entry_addr = entry;
1379
1380 if (interp != NULL) {
1381 VOP_UNLOCK(imgp->vp);
1382 if ((map->flags & MAP_ASLR) != 0) {
1383 /* Assume that interpreter fits into 1/4 of AS */
1384 maxv1 = maxv / 2 + addr / 2;
1385 error = __CONCAT(rnd_, __elfN(base))(map, addr,
1386 maxv1, PAGE_SIZE, &addr);
1387 }
1388 if (error == 0) {
1389 error = __elfN(load_interp)(imgp, brand_info, interp,
1390 &addr, &imgp->entry_addr);
1391 }
1392 vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
1393 if (error != 0)
1394 goto ret;
1395 } else
1396 addr = et_dyn_addr;
1397
1398 error = exec_map_stack(imgp);
1399 if (error != 0)
1400 goto ret;
1401
1402 /*
1403 * Construct auxargs table (used by the copyout_auxargs routine)
1404 */
1405 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_NOWAIT);
1406 if (elf_auxargs == NULL) {
1407 VOP_UNLOCK(imgp->vp);
1408 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK);
1409 vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
1410 }
1411 elf_auxargs->execfd = -1;
1412 elf_auxargs->phdr = proghdr + et_dyn_addr;
1413 elf_auxargs->phent = hdr->e_phentsize;
1414 elf_auxargs->phnum = hdr->e_phnum;
1415 elf_auxargs->pagesz = PAGE_SIZE;
1416 elf_auxargs->base = addr;
1417 elf_auxargs->flags = 0;
1418 elf_auxargs->entry = entry;
1419 elf_auxargs->hdr_eflags = hdr->e_flags;
1420
1421 imgp->auxargs = elf_auxargs;
1422 imgp->interpreted = 0;
1423 imgp->reloc_base = addr;
1424 imgp->proc->p_osrel = osrel;
1425 imgp->proc->p_fctl0 = fctl0;
1426 imgp->proc->p_elf_flags = hdr->e_flags;
1427
1428 ret:
1429 ASSERT_VOP_LOCKED(imgp->vp, "skipped relock");
1430 if (free_interp)
1431 free(interp, M_TEMP);
1432 return (error);
1433 }
1434
1435 #define elf_suword __CONCAT(suword, __ELF_WORD_SIZE)
1436
1437 int
1438 __elfN(freebsd_copyout_auxargs)(struct image_params *imgp, uintptr_t base)
1439 {
1440 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs;
1441 Elf_Auxinfo *argarray, *pos;
1442 struct vmspace *vmspace;
1443 rlim_t stacksz;
1444 int error, bsdflags, oc;
1445
1446 argarray = pos = malloc(AT_COUNT * sizeof(*pos), M_TEMP,
1447 M_WAITOK | M_ZERO);
1448
1449 vmspace = imgp->proc->p_vmspace;
1450
1451 if (args->execfd != -1)
1452 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
1453 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
1454 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
1455 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
1456 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
1457 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
1458 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
1459 AUXARGS_ENTRY(pos, AT_BASE, args->base);
1460 AUXARGS_ENTRY(pos, AT_EHDRFLAGS, args->hdr_eflags);
1461 if (imgp->execpathp != 0)
1462 AUXARGS_ENTRY_PTR(pos, AT_EXECPATH, imgp->execpathp);
1463 AUXARGS_ENTRY(pos, AT_OSRELDATE,
1464 imgp->proc->p_ucred->cr_prison->pr_osreldate);
1465 if (imgp->canary != 0) {
1466 AUXARGS_ENTRY_PTR(pos, AT_CANARY, imgp->canary);
1467 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen);
1468 }
1469 AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus);
1470 if (imgp->pagesizes != 0) {
1471 AUXARGS_ENTRY_PTR(pos, AT_PAGESIZES, imgp->pagesizes);
1472 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen);
1473 }
1474 if (imgp->sysent->sv_timekeep_base != 0) {
1475 AUXARGS_ENTRY(pos, AT_TIMEKEEP,
1476 imgp->sysent->sv_timekeep_base);
1477 }
1478 AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj
1479 != NULL && imgp->stack_prot != 0 ? imgp->stack_prot :
1480 imgp->sysent->sv_stackprot);
1481 if (imgp->sysent->sv_hwcap != NULL)
1482 AUXARGS_ENTRY(pos, AT_HWCAP, *imgp->sysent->sv_hwcap);
1483 if (imgp->sysent->sv_hwcap2 != NULL)
1484 AUXARGS_ENTRY(pos, AT_HWCAP2, *imgp->sysent->sv_hwcap2);
1485 bsdflags = 0;
1486 bsdflags |= __elfN(sigfastblock) ? ELF_BSDF_SIGFASTBLK : 0;
1487 oc = atomic_load_int(&vm_overcommit);
1488 bsdflags |= (oc & (SWAP_RESERVE_FORCE_ON | SWAP_RESERVE_RLIMIT_ON)) !=
1489 0 ? ELF_BSDF_VMNOOVERCOMMIT : 0;
1490 AUXARGS_ENTRY(pos, AT_BSDFLAGS, bsdflags);
1491 AUXARGS_ENTRY(pos, AT_ARGC, imgp->args->argc);
1492 AUXARGS_ENTRY_PTR(pos, AT_ARGV, imgp->argv);
1493 AUXARGS_ENTRY(pos, AT_ENVC, imgp->args->envc);
1494 AUXARGS_ENTRY_PTR(pos, AT_ENVV, imgp->envv);
1495 AUXARGS_ENTRY_PTR(pos, AT_PS_STRINGS, imgp->ps_strings);
1496 if (imgp->sysent->sv_fxrng_gen_base != 0)
1497 AUXARGS_ENTRY(pos, AT_FXRNG, imgp->sysent->sv_fxrng_gen_base);
1498 if (imgp->sysent->sv_vdso_base != 0 && __elfN(vdso) != 0)
1499 AUXARGS_ENTRY(pos, AT_KPRELOAD, imgp->sysent->sv_vdso_base);
1500 AUXARGS_ENTRY(pos, AT_USRSTACKBASE, round_page(vmspace->vm_stacktop));
1501 stacksz = imgp->proc->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur;
1502 AUXARGS_ENTRY(pos, AT_USRSTACKLIM, stacksz);
1503 AUXARGS_ENTRY(pos, AT_NULL, 0);
1504
1505 free(imgp->auxargs, M_TEMP);
1506 imgp->auxargs = NULL;
1507 KASSERT(pos - argarray <= AT_COUNT, ("Too many auxargs"));
1508
1509 error = copyout(argarray, (void *)base, sizeof(*argarray) * AT_COUNT);
1510 free(argarray, M_TEMP);
1511 return (error);
1512 }
1513
1514 int
1515 __elfN(freebsd_fixup)(uintptr_t *stack_base, struct image_params *imgp)
1516 {
1517 Elf_Addr *base;
1518
1519 base = (Elf_Addr *)*stack_base;
1520 base--;
1521 if (elf_suword(base, imgp->args->argc) == -1)
1522 return (EFAULT);
1523 *stack_base = (uintptr_t)base;
1524 return (0);
1525 }
1526
1527 /*
1528 * Code for generating ELF core dumps.
1529 */
1530
1531 typedef void (*segment_callback)(vm_map_entry_t, void *);
1532
1533 /* Closure for cb_put_phdr(). */
1534 struct phdr_closure {
1535 Elf_Phdr *phdr; /* Program header to fill in */
1536 Elf_Off offset; /* Offset of segment in core file */
1537 };
1538
1539 struct note_info {
1540 int type; /* Note type. */
1541 struct regset *regset; /* Register set. */
1542 outfunc_t outfunc; /* Output function. */
1543 void *outarg; /* Argument for the output function. */
1544 size_t outsize; /* Output size. */
1545 TAILQ_ENTRY(note_info) link; /* Link to the next note info. */
1546 };
1547
1548 TAILQ_HEAD(note_info_list, note_info);
1549
1550 extern int compress_user_cores;
1551 extern int compress_user_cores_level;
1552
1553 static void cb_put_phdr(vm_map_entry_t, void *);
1554 static void cb_size_segment(vm_map_entry_t, void *);
1555 static void each_dumpable_segment(struct thread *, segment_callback, void *,
1556 int);
1557 static int __elfN(corehdr)(struct coredump_params *, int, void *, size_t,
1558 struct note_info_list *, size_t, int);
1559 static void __elfN(putnote)(struct thread *td, struct note_info *, struct sbuf *);
1560
1561 static void __elfN(note_prpsinfo)(void *, struct sbuf *, size_t *);
1562 static void __elfN(note_threadmd)(void *, struct sbuf *, size_t *);
1563 static void __elfN(note_procstat_auxv)(void *, struct sbuf *, size_t *);
1564 static void __elfN(note_procstat_proc)(void *, struct sbuf *, size_t *);
1565 static void __elfN(note_procstat_psstrings)(void *, struct sbuf *, size_t *);
1566 static void note_procstat_files(void *, struct sbuf *, size_t *);
1567 static void note_procstat_groups(void *, struct sbuf *, size_t *);
1568 static void note_procstat_osrel(void *, struct sbuf *, size_t *);
1569 static void note_procstat_rlimit(void *, struct sbuf *, size_t *);
1570 static void note_procstat_umask(void *, struct sbuf *, size_t *);
1571 static void note_procstat_vmmap(void *, struct sbuf *, size_t *);
1572
1573 static int
1574 core_compressed_write(void *base, size_t len, off_t offset, void *arg)
1575 {
1576
1577 return (core_write((struct coredump_params *)arg, base, len, offset,
1578 UIO_SYSSPACE, NULL));
1579 }
1580
1581 int
1582 __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags)
1583 {
1584 struct ucred *cred = td->td_ucred;
1585 int compm, error = 0;
1586 struct sseg_closure seginfo;
1587 struct note_info_list notelst;
1588 struct coredump_params params;
1589 struct note_info *ninfo;
1590 void *hdr, *tmpbuf;
1591 size_t hdrsize, notesz, coresize;
1592
1593 hdr = NULL;
1594 tmpbuf = NULL;
1595 TAILQ_INIT(¬elst);
1596
1597 /* Size the program segments. */
1598 __elfN(size_segments)(td, &seginfo, flags);
1599
1600 /*
1601 * Collect info about the core file header area.
1602 */
1603 hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count);
1604 if (seginfo.count + 1 >= PN_XNUM)
1605 hdrsize += sizeof(Elf_Shdr);
1606 td->td_proc->p_sysent->sv_elf_core_prepare_notes(td, ¬elst, ¬esz);
1607 coresize = round_page(hdrsize + notesz) + seginfo.size;
1608
1609 /* Set up core dump parameters. */
1610 params.offset = 0;
1611 params.active_cred = cred;
1612 params.file_cred = NOCRED;
1613 params.td = td;
1614 params.vp = vp;
1615 params.comp = NULL;
1616
1617 #ifdef RACCT
1618 if (racct_enable) {
1619 PROC_LOCK(td->td_proc);
1620 error = racct_add(td->td_proc, RACCT_CORE, coresize);
1621 PROC_UNLOCK(td->td_proc);
1622 if (error != 0) {
1623 error = EFAULT;
1624 goto done;
1625 }
1626 }
1627 #endif
1628 if (coresize >= limit) {
1629 error = EFAULT;
1630 goto done;
1631 }
1632
1633 /* Create a compression stream if necessary. */
1634 compm = compress_user_cores;
1635 if ((flags & (SVC_PT_COREDUMP | SVC_NOCOMPRESS)) == SVC_PT_COREDUMP &&
1636 compm == 0)
1637 compm = COMPRESS_GZIP;
1638 if (compm != 0) {
1639 params.comp = compressor_init(core_compressed_write,
1640 compm, CORE_BUF_SIZE,
1641 compress_user_cores_level, ¶ms);
1642 if (params.comp == NULL) {
1643 error = EFAULT;
1644 goto done;
1645 }
1646 tmpbuf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO);
1647 }
1648
1649 /*
1650 * Allocate memory for building the header, fill it up,
1651 * and write it out following the notes.
1652 */
1653 hdr = malloc(hdrsize, M_TEMP, M_WAITOK);
1654 error = __elfN(corehdr)(¶ms, seginfo.count, hdr, hdrsize, ¬elst,
1655 notesz, flags);
1656
1657 /* Write the contents of all of the writable segments. */
1658 if (error == 0) {
1659 Elf_Phdr *php;
1660 off_t offset;
1661 int i;
1662
1663 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1;
1664 offset = round_page(hdrsize + notesz);
1665 for (i = 0; i < seginfo.count; i++) {
1666 error = core_output((char *)(uintptr_t)php->p_vaddr,
1667 php->p_filesz, offset, ¶ms, tmpbuf);
1668 if (error != 0)
1669 break;
1670 offset += php->p_filesz;
1671 php++;
1672 }
1673 if (error == 0 && params.comp != NULL)
1674 error = compressor_flush(params.comp);
1675 }
1676 if (error) {
1677 log(LOG_WARNING,
1678 "Failed to write core file for process %s (error %d)\n",
1679 curproc->p_comm, error);
1680 }
1681
1682 done:
1683 free(tmpbuf, M_TEMP);
1684 if (params.comp != NULL)
1685 compressor_fini(params.comp);
1686 while ((ninfo = TAILQ_FIRST(¬elst)) != NULL) {
1687 TAILQ_REMOVE(¬elst, ninfo, link);
1688 free(ninfo, M_TEMP);
1689 }
1690 if (hdr != NULL)
1691 free(hdr, M_TEMP);
1692
1693 return (error);
1694 }
1695
1696 /*
1697 * A callback for each_dumpable_segment() to write out the segment's
1698 * program header entry.
1699 */
1700 static void
1701 cb_put_phdr(vm_map_entry_t entry, void *closure)
1702 {
1703 struct phdr_closure *phc = (struct phdr_closure *)closure;
1704 Elf_Phdr *phdr = phc->phdr;
1705
1706 phc->offset = round_page(phc->offset);
1707
1708 phdr->p_type = PT_LOAD;
1709 phdr->p_offset = phc->offset;
1710 phdr->p_vaddr = entry->start;
1711 phdr->p_paddr = 0;
1712 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
1713 phdr->p_align = PAGE_SIZE;
1714 phdr->p_flags = __elfN(untrans_prot)(entry->protection);
1715
1716 phc->offset += phdr->p_filesz;
1717 phc->phdr++;
1718 }
1719
1720 /*
1721 * A callback for each_dumpable_segment() to gather information about
1722 * the number of segments and their total size.
1723 */
1724 static void
1725 cb_size_segment(vm_map_entry_t entry, void *closure)
1726 {
1727 struct sseg_closure *ssc = (struct sseg_closure *)closure;
1728
1729 ssc->count++;
1730 ssc->size += entry->end - entry->start;
1731 }
1732
1733 void
1734 __elfN(size_segments)(struct thread *td, struct sseg_closure *seginfo,
1735 int flags)
1736 {
1737 seginfo->count = 0;
1738 seginfo->size = 0;
1739
1740 each_dumpable_segment(td, cb_size_segment, seginfo, flags);
1741 }
1742
1743 /*
1744 * For each writable segment in the process's memory map, call the given
1745 * function with a pointer to the map entry and some arbitrary
1746 * caller-supplied data.
1747 */
1748 static void
1749 each_dumpable_segment(struct thread *td, segment_callback func, void *closure,
1750 int flags)
1751 {
1752 struct proc *p = td->td_proc;
1753 vm_map_t map = &p->p_vmspace->vm_map;
1754 vm_map_entry_t entry;
1755 vm_object_t backing_object, object;
1756 bool ignore_entry;
1757
1758 vm_map_lock_read(map);
1759 VM_MAP_ENTRY_FOREACH(entry, map) {
1760 /*
1761 * Don't dump inaccessible mappings, deal with legacy
1762 * coredump mode.
1763 *
1764 * Note that read-only segments related to the elf binary
1765 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer
1766 * need to arbitrarily ignore such segments.
1767 */
1768 if ((flags & SVC_ALL) == 0) {
1769 if (elf_legacy_coredump) {
1770 if ((entry->protection & VM_PROT_RW) !=
1771 VM_PROT_RW)
1772 continue;
1773 } else {
1774 if ((entry->protection & VM_PROT_ALL) == 0)
1775 continue;
1776 }
1777 }
1778
1779 /*
1780 * Dont include memory segment in the coredump if
1781 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in
1782 * madvise(2). Do not dump submaps (i.e. parts of the
1783 * kernel map).
1784 */
1785 if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0)
1786 continue;
1787 if ((entry->eflags & MAP_ENTRY_NOCOREDUMP) != 0 &&
1788 (flags & SVC_ALL) == 0)
1789 continue;
1790 if ((object = entry->object.vm_object) == NULL)
1791 continue;
1792
1793 /* Ignore memory-mapped devices and such things. */
1794 VM_OBJECT_RLOCK(object);
1795 while ((backing_object = object->backing_object) != NULL) {
1796 VM_OBJECT_RLOCK(backing_object);
1797 VM_OBJECT_RUNLOCK(object);
1798 object = backing_object;
1799 }
1800 ignore_entry = (object->flags & OBJ_FICTITIOUS) != 0;
1801 VM_OBJECT_RUNLOCK(object);
1802 if (ignore_entry)
1803 continue;
1804
1805 (*func)(entry, closure);
1806 }
1807 vm_map_unlock_read(map);
1808 }
1809
1810 /*
1811 * Write the core file header to the file, including padding up to
1812 * the page boundary.
1813 */
1814 static int
1815 __elfN(corehdr)(struct coredump_params *p, int numsegs, void *hdr,
1816 size_t hdrsize, struct note_info_list *notelst, size_t notesz,
1817 int flags)
1818 {
1819 struct note_info *ninfo;
1820 struct sbuf *sb;
1821 int error;
1822
1823 /* Fill in the header. */
1824 bzero(hdr, hdrsize);
1825 __elfN(puthdr)(p->td, hdr, hdrsize, numsegs, notesz, flags);
1826
1827 sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN);
1828 sbuf_set_drain(sb, sbuf_drain_core_output, p);
1829 sbuf_start_section(sb, NULL);
1830 sbuf_bcat(sb, hdr, hdrsize);
1831 TAILQ_FOREACH(ninfo, notelst, link)
1832 __elfN(putnote)(p->td, ninfo, sb);
1833 /* Align up to a page boundary for the program segments. */
1834 sbuf_end_section(sb, -1, PAGE_SIZE, 0);
1835 error = sbuf_finish(sb);
1836 sbuf_delete(sb);
1837
1838 return (error);
1839 }
1840
1841 void
1842 __elfN(prepare_notes)(struct thread *td, struct note_info_list *list,
1843 size_t *sizep)
1844 {
1845 struct proc *p;
1846 struct thread *thr;
1847 size_t size;
1848
1849 p = td->td_proc;
1850 size = 0;
1851
1852 size += __elfN(register_note)(td, list, NT_PRPSINFO,
1853 __elfN(note_prpsinfo), p);
1854
1855 /*
1856 * To have the debugger select the right thread (LWP) as the initial
1857 * thread, we dump the state of the thread passed to us in td first.
1858 * This is the thread that causes the core dump and thus likely to
1859 * be the right thread one wants to have selected in the debugger.
1860 */
1861 thr = td;
1862 while (thr != NULL) {
1863 size += __elfN(prepare_register_notes)(td, list, thr);
1864 size += __elfN(register_note)(td, list, -1,
1865 __elfN(note_threadmd), thr);
1866
1867 thr = thr == td ? TAILQ_FIRST(&p->p_threads) :
1868 TAILQ_NEXT(thr, td_plist);
1869 if (thr == td)
1870 thr = TAILQ_NEXT(thr, td_plist);
1871 }
1872
1873 size += __elfN(register_note)(td, list, NT_PROCSTAT_PROC,
1874 __elfN(note_procstat_proc), p);
1875 size += __elfN(register_note)(td, list, NT_PROCSTAT_FILES,
1876 note_procstat_files, p);
1877 size += __elfN(register_note)(td, list, NT_PROCSTAT_VMMAP,
1878 note_procstat_vmmap, p);
1879 size += __elfN(register_note)(td, list, NT_PROCSTAT_GROUPS,
1880 note_procstat_groups, p);
1881 size += __elfN(register_note)(td, list, NT_PROCSTAT_UMASK,
1882 note_procstat_umask, p);
1883 size += __elfN(register_note)(td, list, NT_PROCSTAT_RLIMIT,
1884 note_procstat_rlimit, p);
1885 size += __elfN(register_note)(td, list, NT_PROCSTAT_OSREL,
1886 note_procstat_osrel, p);
1887 size += __elfN(register_note)(td, list, NT_PROCSTAT_PSSTRINGS,
1888 __elfN(note_procstat_psstrings), p);
1889 size += __elfN(register_note)(td, list, NT_PROCSTAT_AUXV,
1890 __elfN(note_procstat_auxv), p);
1891
1892 *sizep = size;
1893 }
1894
1895 void
1896 __elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs,
1897 size_t notesz, int flags)
1898 {
1899 Elf_Ehdr *ehdr;
1900 Elf_Phdr *phdr;
1901 Elf_Shdr *shdr;
1902 struct phdr_closure phc;
1903 Elf_Brandinfo *bi;
1904
1905 ehdr = (Elf_Ehdr *)hdr;
1906 bi = td->td_proc->p_elf_brandinfo;
1907
1908 ehdr->e_ident[EI_MAG0] = ELFMAG0;
1909 ehdr->e_ident[EI_MAG1] = ELFMAG1;
1910 ehdr->e_ident[EI_MAG2] = ELFMAG2;
1911 ehdr->e_ident[EI_MAG3] = ELFMAG3;
1912 ehdr->e_ident[EI_CLASS] = ELF_CLASS;
1913 ehdr->e_ident[EI_DATA] = ELF_DATA;
1914 ehdr->e_ident[EI_VERSION] = EV_CURRENT;
1915 ehdr->e_ident[EI_OSABI] = td->td_proc->p_sysent->sv_elf_core_osabi;
1916 ehdr->e_ident[EI_ABIVERSION] = 0;
1917 ehdr->e_ident[EI_PAD] = 0;
1918 ehdr->e_type = ET_CORE;
1919 ehdr->e_machine = bi->machine;
1920 ehdr->e_version = EV_CURRENT;
1921 ehdr->e_entry = 0;
1922 ehdr->e_phoff = sizeof(Elf_Ehdr);
1923 ehdr->e_flags = td->td_proc->p_elf_flags;
1924 ehdr->e_ehsize = sizeof(Elf_Ehdr);
1925 ehdr->e_phentsize = sizeof(Elf_Phdr);
1926 ehdr->e_shentsize = sizeof(Elf_Shdr);
1927 ehdr->e_shstrndx = SHN_UNDEF;
1928 if (numsegs + 1 < PN_XNUM) {
1929 ehdr->e_phnum = numsegs + 1;
1930 ehdr->e_shnum = 0;
1931 } else {
1932 ehdr->e_phnum = PN_XNUM;
1933 ehdr->e_shnum = 1;
1934
1935 ehdr->e_shoff = ehdr->e_phoff +
1936 (numsegs + 1) * ehdr->e_phentsize;
1937 KASSERT(ehdr->e_shoff == hdrsize - sizeof(Elf_Shdr),
1938 ("e_shoff: %zu, hdrsize - shdr: %zu",
1939 (size_t)ehdr->e_shoff, hdrsize - sizeof(Elf_Shdr)));
1940
1941 shdr = (Elf_Shdr *)((char *)hdr + ehdr->e_shoff);
1942 memset(shdr, 0, sizeof(*shdr));
1943 /*
1944 * A special first section is used to hold large segment and
1945 * section counts. This was proposed by Sun Microsystems in
1946 * Solaris and has been adopted by Linux; the standard ELF
1947 * tools are already familiar with the technique.
1948 *
1949 * See table 7-7 of the Solaris "Linker and Libraries Guide"
1950 * (or 12-7 depending on the version of the document) for more
1951 * details.
1952 */
1953 shdr->sh_type = SHT_NULL;
1954 shdr->sh_size = ehdr->e_shnum;
1955 shdr->sh_link = ehdr->e_shstrndx;
1956 shdr->sh_info = numsegs + 1;
1957 }
1958
1959 /*
1960 * Fill in the program header entries.
1961 */
1962 phdr = (Elf_Phdr *)((char *)hdr + ehdr->e_phoff);
1963
1964 /* The note segement. */
1965 phdr->p_type = PT_NOTE;
1966 phdr->p_offset = hdrsize;
1967 phdr->p_vaddr = 0;
1968 phdr->p_paddr = 0;
1969 phdr->p_filesz = notesz;
1970 phdr->p_memsz = 0;
1971 phdr->p_flags = PF_R;
1972 phdr->p_align = ELF_NOTE_ROUNDSIZE;
1973 phdr++;
1974
1975 /* All the writable segments from the program. */
1976 phc.phdr = phdr;
1977 phc.offset = round_page(hdrsize + notesz);
1978 each_dumpable_segment(td, cb_put_phdr, &phc, flags);
1979 }
1980
1981 static size_t
1982 __elfN(register_regset_note)(struct thread *td, struct note_info_list *list,
1983 struct regset *regset, struct thread *target_td)
1984 {
1985 const struct sysentvec *sv;
1986 struct note_info *ninfo;
1987 size_t size, notesize;
1988
1989 size = 0;
1990 if (!regset->get(regset, target_td, NULL, &size) || size == 0)
1991 return (0);
1992
1993 ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK);
1994 ninfo->type = regset->note;
1995 ninfo->regset = regset;
1996 ninfo->outarg = target_td;
1997 ninfo->outsize = size;
1998 TAILQ_INSERT_TAIL(list, ninfo, link);
1999
2000 sv = td->td_proc->p_sysent;
2001 notesize = sizeof(Elf_Note) + /* note header */
2002 roundup2(strlen(sv->sv_elf_core_abi_vendor) + 1, ELF_NOTE_ROUNDSIZE) +
2003 /* note name */
2004 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */
2005
2006 return (notesize);
2007 }
2008
2009 size_t
2010 __elfN(register_note)(struct thread *td, struct note_info_list *list,
2011 int type, outfunc_t out, void *arg)
2012 {
2013 const struct sysentvec *sv;
2014 struct note_info *ninfo;
2015 size_t size, notesize;
2016
2017 sv = td->td_proc->p_sysent;
2018 size = 0;
2019 out(arg, NULL, &size);
2020 ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK);
2021 ninfo->type = type;
2022 ninfo->outfunc = out;
2023 ninfo->outarg = arg;
2024 ninfo->outsize = size;
2025 TAILQ_INSERT_TAIL(list, ninfo, link);
2026
2027 if (type == -1)
2028 return (size);
2029
2030 notesize = sizeof(Elf_Note) + /* note header */
2031 roundup2(strlen(sv->sv_elf_core_abi_vendor) + 1, ELF_NOTE_ROUNDSIZE) +
2032 /* note name */
2033 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */
2034
2035 return (notesize);
2036 }
2037
2038 static size_t
2039 append_note_data(const void *src, void *dst, size_t len)
2040 {
2041 size_t padded_len;
2042
2043 padded_len = roundup2(len, ELF_NOTE_ROUNDSIZE);
2044 if (dst != NULL) {
2045 bcopy(src, dst, len);
2046 bzero((char *)dst + len, padded_len - len);
2047 }
2048 return (padded_len);
2049 }
2050
2051 size_t
2052 __elfN(populate_note)(int type, void *src, void *dst, size_t size, void **descp)
2053 {
2054 Elf_Note *note;
2055 char *buf;
2056 size_t notesize;
2057
2058 buf = dst;
2059 if (buf != NULL) {
2060 note = (Elf_Note *)buf;
2061 note->n_namesz = sizeof(FREEBSD_ABI_VENDOR);
2062 note->n_descsz = size;
2063 note->n_type = type;
2064 buf += sizeof(*note);
2065 buf += append_note_data(FREEBSD_ABI_VENDOR, buf,
2066 sizeof(FREEBSD_ABI_VENDOR));
2067 append_note_data(src, buf, size);
2068 if (descp != NULL)
2069 *descp = buf;
2070 }
2071
2072 notesize = sizeof(Elf_Note) + /* note header */
2073 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) +
2074 /* note name */
2075 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */
2076
2077 return (notesize);
2078 }
2079
2080 static void
2081 __elfN(putnote)(struct thread *td, struct note_info *ninfo, struct sbuf *sb)
2082 {
2083 Elf_Note note;
2084 const struct sysentvec *sv;
2085 ssize_t old_len, sect_len;
2086 size_t new_len, descsz, i;
2087
2088 if (ninfo->type == -1) {
2089 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize);
2090 return;
2091 }
2092
2093 sv = td->td_proc->p_sysent;
2094
2095 note.n_namesz = strlen(sv->sv_elf_core_abi_vendor) + 1;
2096 note.n_descsz = ninfo->outsize;
2097 note.n_type = ninfo->type;
2098
2099 sbuf_bcat(sb, ¬e, sizeof(note));
2100 sbuf_start_section(sb, &old_len);
2101 sbuf_bcat(sb, sv->sv_elf_core_abi_vendor,
2102 strlen(sv->sv_elf_core_abi_vendor) + 1);
2103 sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0);
2104 if (note.n_descsz == 0)
2105 return;
2106 sbuf_start_section(sb, &old_len);
2107 if (ninfo->regset != NULL) {
2108 struct regset *regset = ninfo->regset;
2109 void *buf;
2110
2111 buf = malloc(ninfo->outsize, M_TEMP, M_ZERO | M_WAITOK);
2112 (void)regset->get(regset, ninfo->outarg, buf, &ninfo->outsize);
2113 sbuf_bcat(sb, buf, ninfo->outsize);
2114 free(buf, M_TEMP);
2115 } else
2116 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize);
2117 sect_len = sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0);
2118 if (sect_len < 0)
2119 return;
2120
2121 new_len = (size_t)sect_len;
2122 descsz = roundup(note.n_descsz, ELF_NOTE_ROUNDSIZE);
2123 if (new_len < descsz) {
2124 /*
2125 * It is expected that individual note emitters will correctly
2126 * predict their expected output size and fill up to that size
2127 * themselves, padding in a format-specific way if needed.
2128 * However, in case they don't, just do it here with zeros.
2129 */
2130 for (i = 0; i < descsz - new_len; i++)
2131 sbuf_putc(sb, 0);
2132 } else if (new_len > descsz) {
2133 /*
2134 * We can't always truncate sb -- we may have drained some
2135 * of it already.
2136 */
2137 KASSERT(new_len == descsz, ("%s: Note type %u changed as we "
2138 "read it (%zu > %zu). Since it is longer than "
2139 "expected, this coredump's notes are corrupt. THIS "
2140 "IS A BUG in the note_procstat routine for type %u.\n",
2141 __func__, (unsigned)note.n_type, new_len, descsz,
2142 (unsigned)note.n_type));
2143 }
2144 }
2145
2146 /*
2147 * Miscellaneous note out functions.
2148 */
2149
2150 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2151 #include <compat/freebsd32/freebsd32.h>
2152 #include <compat/freebsd32/freebsd32_signal.h>
2153
2154 typedef struct prstatus32 elf_prstatus_t;
2155 typedef struct prpsinfo32 elf_prpsinfo_t;
2156 typedef struct fpreg32 elf_prfpregset_t;
2157 typedef struct fpreg32 elf_fpregset_t;
2158 typedef struct reg32 elf_gregset_t;
2159 typedef struct thrmisc32 elf_thrmisc_t;
2160 typedef struct ptrace_lwpinfo32 elf_lwpinfo_t;
2161 #define ELF_KERN_PROC_MASK KERN_PROC_MASK32
2162 typedef struct kinfo_proc32 elf_kinfo_proc_t;
2163 typedef uint32_t elf_ps_strings_t;
2164 #else
2165 typedef prstatus_t elf_prstatus_t;
2166 typedef prpsinfo_t elf_prpsinfo_t;
2167 typedef prfpregset_t elf_prfpregset_t;
2168 typedef prfpregset_t elf_fpregset_t;
2169 typedef gregset_t elf_gregset_t;
2170 typedef thrmisc_t elf_thrmisc_t;
2171 typedef struct ptrace_lwpinfo elf_lwpinfo_t;
2172 #define ELF_KERN_PROC_MASK 0
2173 typedef struct kinfo_proc elf_kinfo_proc_t;
2174 typedef vm_offset_t elf_ps_strings_t;
2175 #endif
2176
2177 static void
2178 __elfN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep)
2179 {
2180 struct sbuf sbarg;
2181 size_t len;
2182 char *cp, *end;
2183 struct proc *p;
2184 elf_prpsinfo_t *psinfo;
2185 int error;
2186
2187 p = arg;
2188 if (sb != NULL) {
2189 KASSERT(*sizep == sizeof(*psinfo), ("invalid size"));
2190 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK);
2191 psinfo->pr_version = PRPSINFO_VERSION;
2192 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t);
2193 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname));
2194 PROC_LOCK(p);
2195 if (p->p_args != NULL) {
2196 len = sizeof(psinfo->pr_psargs) - 1;
2197 if (len > p->p_args->ar_length)
2198 len = p->p_args->ar_length;
2199 memcpy(psinfo->pr_psargs, p->p_args->ar_args, len);
2200 PROC_UNLOCK(p);
2201 error = 0;
2202 } else {
2203 _PHOLD(p);
2204 PROC_UNLOCK(p);
2205 sbuf_new(&sbarg, psinfo->pr_psargs,
2206 sizeof(psinfo->pr_psargs), SBUF_FIXEDLEN);
2207 error = proc_getargv(curthread, p, &sbarg);
2208 PRELE(p);
2209 if (sbuf_finish(&sbarg) == 0) {
2210 len = sbuf_len(&sbarg);
2211 if (len > 0)
2212 len--;
2213 } else {
2214 len = sizeof(psinfo->pr_psargs) - 1;
2215 }
2216 sbuf_delete(&sbarg);
2217 }
2218 if (error != 0 || len == 0 || (ssize_t)len == -1)
2219 strlcpy(psinfo->pr_psargs, p->p_comm,
2220 sizeof(psinfo->pr_psargs));
2221 else {
2222 KASSERT(len < sizeof(psinfo->pr_psargs),
2223 ("len is too long: %zu vs %zu", len,
2224 sizeof(psinfo->pr_psargs)));
2225 cp = psinfo->pr_psargs;
2226 end = cp + len - 1;
2227 for (;;) {
2228 cp = memchr(cp, '\0', end - cp);
2229 if (cp == NULL)
2230 break;
2231 *cp = ' ';
2232 }
2233 }
2234 psinfo->pr_pid = p->p_pid;
2235 sbuf_bcat(sb, psinfo, sizeof(*psinfo));
2236 free(psinfo, M_TEMP);
2237 }
2238 *sizep = sizeof(*psinfo);
2239 }
2240
2241 static bool
2242 __elfN(get_prstatus)(struct regset *rs, struct thread *td, void *buf,
2243 size_t *sizep)
2244 {
2245 elf_prstatus_t *status;
2246
2247 if (buf != NULL) {
2248 KASSERT(*sizep == sizeof(*status), ("%s: invalid size",
2249 __func__));
2250 status = buf;
2251 memset(status, 0, *sizep);
2252 status->pr_version = PRSTATUS_VERSION;
2253 status->pr_statussz = sizeof(elf_prstatus_t);
2254 status->pr_gregsetsz = sizeof(elf_gregset_t);
2255 status->pr_fpregsetsz = sizeof(elf_fpregset_t);
2256 status->pr_osreldate = osreldate;
2257 status->pr_cursig = td->td_proc->p_sig;
2258 status->pr_pid = td->td_tid;
2259 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2260 fill_regs32(td, &status->pr_reg);
2261 #else
2262 fill_regs(td, &status->pr_reg);
2263 #endif
2264 }
2265 *sizep = sizeof(*status);
2266 return (true);
2267 }
2268
2269 static bool
2270 __elfN(set_prstatus)(struct regset *rs, struct thread *td, void *buf,
2271 size_t size)
2272 {
2273 elf_prstatus_t *status;
2274
2275 KASSERT(size == sizeof(*status), ("%s: invalid size", __func__));
2276 status = buf;
2277 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2278 set_regs32(td, &status->pr_reg);
2279 #else
2280 set_regs(td, &status->pr_reg);
2281 #endif
2282 return (true);
2283 }
2284
2285 static struct regset __elfN(regset_prstatus) = {
2286 .note = NT_PRSTATUS,
2287 .size = sizeof(elf_prstatus_t),
2288 .get = __elfN(get_prstatus),
2289 .set = __elfN(set_prstatus),
2290 };
2291 ELF_REGSET(__elfN(regset_prstatus));
2292
2293 static bool
2294 __elfN(get_fpregset)(struct regset *rs, struct thread *td, void *buf,
2295 size_t *sizep)
2296 {
2297 elf_prfpregset_t *fpregset;
2298
2299 if (buf != NULL) {
2300 KASSERT(*sizep == sizeof(*fpregset), ("%s: invalid size",
2301 __func__));
2302 fpregset = buf;
2303 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2304 fill_fpregs32(td, fpregset);
2305 #else
2306 fill_fpregs(td, fpregset);
2307 #endif
2308 }
2309 *sizep = sizeof(*fpregset);
2310 return (true);
2311 }
2312
2313 static bool
2314 __elfN(set_fpregset)(struct regset *rs, struct thread *td, void *buf,
2315 size_t size)
2316 {
2317 elf_prfpregset_t *fpregset;
2318
2319 fpregset = buf;
2320 KASSERT(size == sizeof(*fpregset), ("%s: invalid size", __func__));
2321 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2322 set_fpregs32(td, fpregset);
2323 #else
2324 set_fpregs(td, fpregset);
2325 #endif
2326 return (true);
2327 }
2328
2329 static struct regset __elfN(regset_fpregset) = {
2330 .note = NT_FPREGSET,
2331 .size = sizeof(elf_prfpregset_t),
2332 .get = __elfN(get_fpregset),
2333 .set = __elfN(set_fpregset),
2334 };
2335 ELF_REGSET(__elfN(regset_fpregset));
2336
2337 static bool
2338 __elfN(get_thrmisc)(struct regset *rs, struct thread *td, void *buf,
2339 size_t *sizep)
2340 {
2341 elf_thrmisc_t *thrmisc;
2342
2343 if (buf != NULL) {
2344 KASSERT(*sizep == sizeof(*thrmisc),
2345 ("%s: invalid size", __func__));
2346 thrmisc = buf;
2347 bzero(thrmisc, sizeof(*thrmisc));
2348 strcpy(thrmisc->pr_tname, td->td_name);
2349 }
2350 *sizep = sizeof(*thrmisc);
2351 return (true);
2352 }
2353
2354 static struct regset __elfN(regset_thrmisc) = {
2355 .note = NT_THRMISC,
2356 .size = sizeof(elf_thrmisc_t),
2357 .get = __elfN(get_thrmisc),
2358 };
2359 ELF_REGSET(__elfN(regset_thrmisc));
2360
2361 static bool
2362 __elfN(get_lwpinfo)(struct regset *rs, struct thread *td, void *buf,
2363 size_t *sizep)
2364 {
2365 elf_lwpinfo_t pl;
2366 size_t size;
2367 int structsize;
2368
2369 size = sizeof(structsize) + sizeof(pl);
2370 if (buf != NULL) {
2371 KASSERT(*sizep == size, ("%s: invalid size", __func__));
2372 structsize = sizeof(pl);
2373 memcpy(buf, &structsize, sizeof(structsize));
2374 bzero(&pl, sizeof(pl));
2375 pl.pl_lwpid = td->td_tid;
2376 pl.pl_event = PL_EVENT_NONE;
2377 pl.pl_sigmask = td->td_sigmask;
2378 pl.pl_siglist = td->td_siglist;
2379 if (td->td_si.si_signo != 0) {
2380 pl.pl_event = PL_EVENT_SIGNAL;
2381 pl.pl_flags |= PL_FLAG_SI;
2382 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2383 siginfo_to_siginfo32(&td->td_si, &pl.pl_siginfo);
2384 #else
2385 pl.pl_siginfo = td->td_si;
2386 #endif
2387 }
2388 strcpy(pl.pl_tdname, td->td_name);
2389 /* XXX TODO: supply more information in struct ptrace_lwpinfo*/
2390 memcpy((int *)buf + 1, &pl, sizeof(pl));
2391 }
2392 *sizep = size;
2393 return (true);
2394 }
2395
2396 static struct regset __elfN(regset_lwpinfo) = {
2397 .note = NT_PTLWPINFO,
2398 .size = sizeof(int) + sizeof(elf_lwpinfo_t),
2399 .get = __elfN(get_lwpinfo),
2400 };
2401 ELF_REGSET(__elfN(regset_lwpinfo));
2402
2403 static size_t
2404 __elfN(prepare_register_notes)(struct thread *td, struct note_info_list *list,
2405 struct thread *target_td)
2406 {
2407 struct sysentvec *sv = td->td_proc->p_sysent;
2408 struct regset **regsetp, **regset_end, *regset;
2409 size_t size;
2410
2411 size = 0;
2412
2413 /* NT_PRSTATUS must be the first register set note. */
2414 size += __elfN(register_regset_note)(td, list, &__elfN(regset_prstatus),
2415 target_td);
2416
2417 regsetp = sv->sv_regset_begin;
2418 if (regsetp == NULL) {
2419 /* XXX: This shouldn't be true for any FreeBSD ABIs. */
2420 size += __elfN(register_regset_note)(td, list,
2421 &__elfN(regset_fpregset), target_td);
2422 return (size);
2423 }
2424 regset_end = sv->sv_regset_end;
2425 MPASS(regset_end != NULL);
2426 for (; regsetp < regset_end; regsetp++) {
2427 regset = *regsetp;
2428 if (regset->note == NT_PRSTATUS)
2429 continue;
2430 size += __elfN(register_regset_note)(td, list, regset,
2431 target_td);
2432 }
2433 return (size);
2434 }
2435
2436 /*
2437 * Allow for MD specific notes, as well as any MD
2438 * specific preparations for writing MI notes.
2439 */
2440 static void
2441 __elfN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep)
2442 {
2443 struct thread *td;
2444 void *buf;
2445 size_t size;
2446
2447 td = (struct thread *)arg;
2448 size = *sizep;
2449 if (size != 0 && sb != NULL)
2450 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK);
2451 else
2452 buf = NULL;
2453 size = 0;
2454 __elfN(dump_thread)(td, buf, &size);
2455 KASSERT(sb == NULL || *sizep == size, ("invalid size"));
2456 if (size != 0 && sb != NULL)
2457 sbuf_bcat(sb, buf, size);
2458 free(buf, M_TEMP);
2459 *sizep = size;
2460 }
2461
2462 #ifdef KINFO_PROC_SIZE
2463 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE);
2464 #endif
2465
2466 static void
2467 __elfN(note_procstat_proc)(void *arg, struct sbuf *sb, size_t *sizep)
2468 {
2469 struct proc *p;
2470 size_t size;
2471 int structsize;
2472
2473 p = arg;
2474 size = sizeof(structsize) + p->p_numthreads *
2475 sizeof(elf_kinfo_proc_t);
2476
2477 if (sb != NULL) {
2478 KASSERT(*sizep == size, ("invalid size"));
2479 structsize = sizeof(elf_kinfo_proc_t);
2480 sbuf_bcat(sb, &structsize, sizeof(structsize));
2481 sx_slock(&proctree_lock);
2482 PROC_LOCK(p);
2483 kern_proc_out(p, sb, ELF_KERN_PROC_MASK);
2484 sx_sunlock(&proctree_lock);
2485 }
2486 *sizep = size;
2487 }
2488
2489 #ifdef KINFO_FILE_SIZE
2490 CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE);
2491 #endif
2492
2493 static void
2494 note_procstat_files(void *arg, struct sbuf *sb, size_t *sizep)
2495 {
2496 struct proc *p;
2497 size_t size, sect_sz, i;
2498 ssize_t start_len, sect_len;
2499 int structsize, filedesc_flags;
2500
2501 if (coredump_pack_fileinfo)
2502 filedesc_flags = KERN_FILEDESC_PACK_KINFO;
2503 else
2504 filedesc_flags = 0;
2505
2506 p = arg;
2507 structsize = sizeof(struct kinfo_file);
2508 if (sb == NULL) {
2509 size = 0;
2510 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
2511 sbuf_set_drain(sb, sbuf_count_drain, &size);
2512 sbuf_bcat(sb, &structsize, sizeof(structsize));
2513 PROC_LOCK(p);
2514 kern_proc_filedesc_out(p, sb, -1, filedesc_flags);
2515 sbuf_finish(sb);
2516 sbuf_delete(sb);
2517 *sizep = size;
2518 } else {
2519 sbuf_start_section(sb, &start_len);
2520
2521 sbuf_bcat(sb, &structsize, sizeof(structsize));
2522 PROC_LOCK(p);
2523 kern_proc_filedesc_out(p, sb, *sizep - sizeof(structsize),
2524 filedesc_flags);
2525
2526 sect_len = sbuf_end_section(sb, start_len, 0, 0);
2527 if (sect_len < 0)
2528 return;
2529 sect_sz = sect_len;
2530
2531 KASSERT(sect_sz <= *sizep,
2532 ("kern_proc_filedesc_out did not respect maxlen; "
2533 "requested %zu, got %zu", *sizep - sizeof(structsize),
2534 sect_sz - sizeof(structsize)));
2535
2536 for (i = 0; i < *sizep - sect_sz && sb->s_error == 0; i++)
2537 sbuf_putc(sb, 0);
2538 }
2539 }
2540
2541 #ifdef KINFO_VMENTRY_SIZE
2542 CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE);
2543 #endif
2544
2545 static void
2546 note_procstat_vmmap(void *arg, struct sbuf *sb, size_t *sizep)
2547 {
2548 struct proc *p;
2549 size_t size;
2550 int structsize, vmmap_flags;
2551
2552 if (coredump_pack_vmmapinfo)
2553 vmmap_flags = KERN_VMMAP_PACK_KINFO;
2554 else
2555 vmmap_flags = 0;
2556
2557 p = arg;
2558 structsize = sizeof(struct kinfo_vmentry);
2559 if (sb == NULL) {
2560 size = 0;
2561 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
2562 sbuf_set_drain(sb, sbuf_count_drain, &size);
2563 sbuf_bcat(sb, &structsize, sizeof(structsize));
2564 PROC_LOCK(p);
2565 kern_proc_vmmap_out(p, sb, -1, vmmap_flags);
2566 sbuf_finish(sb);
2567 sbuf_delete(sb);
2568 *sizep = size;
2569 } else {
2570 sbuf_bcat(sb, &structsize, sizeof(structsize));
2571 PROC_LOCK(p);
2572 kern_proc_vmmap_out(p, sb, *sizep - sizeof(structsize),
2573 vmmap_flags);
2574 }
2575 }
2576
2577 static void
2578 note_procstat_groups(void *arg, struct sbuf *sb, size_t *sizep)
2579 {
2580 struct proc *p;
2581 size_t size;
2582 int structsize;
2583
2584 p = arg;
2585 size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t);
2586 if (sb != NULL) {
2587 KASSERT(*sizep == size, ("invalid size"));
2588 structsize = sizeof(gid_t);
2589 sbuf_bcat(sb, &structsize, sizeof(structsize));
2590 sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups *
2591 sizeof(gid_t));
2592 }
2593 *sizep = size;
2594 }
2595
2596 static void
2597 note_procstat_umask(void *arg, struct sbuf *sb, size_t *sizep)
2598 {
2599 struct proc *p;
2600 size_t size;
2601 int structsize;
2602
2603 p = arg;
2604 size = sizeof(structsize) + sizeof(p->p_pd->pd_cmask);
2605 if (sb != NULL) {
2606 KASSERT(*sizep == size, ("invalid size"));
2607 structsize = sizeof(p->p_pd->pd_cmask);
2608 sbuf_bcat(sb, &structsize, sizeof(structsize));
2609 sbuf_bcat(sb, &p->p_pd->pd_cmask, sizeof(p->p_pd->pd_cmask));
2610 }
2611 *sizep = size;
2612 }
2613
2614 static void
2615 note_procstat_rlimit(void *arg, struct sbuf *sb, size_t *sizep)
2616 {
2617 struct proc *p;
2618 struct rlimit rlim[RLIM_NLIMITS];
2619 size_t size;
2620 int structsize, i;
2621
2622 p = arg;
2623 size = sizeof(structsize) + sizeof(rlim);
2624 if (sb != NULL) {
2625 KASSERT(*sizep == size, ("invalid size"));
2626 structsize = sizeof(rlim);
2627 sbuf_bcat(sb, &structsize, sizeof(structsize));
2628 PROC_LOCK(p);
2629 for (i = 0; i < RLIM_NLIMITS; i++)
2630 lim_rlimit_proc(p, i, &rlim[i]);
2631 PROC_UNLOCK(p);
2632 sbuf_bcat(sb, rlim, sizeof(rlim));
2633 }
2634 *sizep = size;
2635 }
2636
2637 static void
2638 note_procstat_osrel(void *arg, struct sbuf *sb, size_t *sizep)
2639 {
2640 struct proc *p;
2641 size_t size;
2642 int structsize;
2643
2644 p = arg;
2645 size = sizeof(structsize) + sizeof(p->p_osrel);
2646 if (sb != NULL) {
2647 KASSERT(*sizep == size, ("invalid size"));
2648 structsize = sizeof(p->p_osrel);
2649 sbuf_bcat(sb, &structsize, sizeof(structsize));
2650 sbuf_bcat(sb, &p->p_osrel, sizeof(p->p_osrel));
2651 }
2652 *sizep = size;
2653 }
2654
2655 static void
2656 __elfN(note_procstat_psstrings)(void *arg, struct sbuf *sb, size_t *sizep)
2657 {
2658 struct proc *p;
2659 elf_ps_strings_t ps_strings;
2660 size_t size;
2661 int structsize;
2662
2663 p = arg;
2664 size = sizeof(structsize) + sizeof(ps_strings);
2665 if (sb != NULL) {
2666 KASSERT(*sizep == size, ("invalid size"));
2667 structsize = sizeof(ps_strings);
2668 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2669 ps_strings = PTROUT(PROC_PS_STRINGS(p));
2670 #else
2671 ps_strings = PROC_PS_STRINGS(p);
2672 #endif
2673 sbuf_bcat(sb, &structsize, sizeof(structsize));
2674 sbuf_bcat(sb, &ps_strings, sizeof(ps_strings));
2675 }
2676 *sizep = size;
2677 }
2678
2679 static void
2680 __elfN(note_procstat_auxv)(void *arg, struct sbuf *sb, size_t *sizep)
2681 {
2682 struct proc *p;
2683 size_t size;
2684 int structsize;
2685
2686 p = arg;
2687 if (sb == NULL) {
2688 size = 0;
2689 sb = sbuf_new(NULL, NULL, AT_COUNT * sizeof(Elf_Auxinfo),
2690 SBUF_FIXEDLEN);
2691 sbuf_set_drain(sb, sbuf_count_drain, &size);
2692 sbuf_bcat(sb, &structsize, sizeof(structsize));
2693 PHOLD(p);
2694 proc_getauxv(curthread, p, sb);
2695 PRELE(p);
2696 sbuf_finish(sb);
2697 sbuf_delete(sb);
2698 *sizep = size;
2699 } else {
2700 structsize = sizeof(Elf_Auxinfo);
2701 sbuf_bcat(sb, &structsize, sizeof(structsize));
2702 PHOLD(p);
2703 proc_getauxv(curthread, p, sb);
2704 PRELE(p);
2705 }
2706 }
2707
2708 static boolean_t
2709 __elfN(parse_notes)(struct image_params *imgp, Elf_Note *checknote,
2710 const char *note_vendor, const Elf_Phdr *pnote,
2711 boolean_t (*cb)(const Elf_Note *, void *, boolean_t *), void *cb_arg)
2712 {
2713 const Elf_Note *note, *note0, *note_end;
2714 const char *note_name;
2715 char *buf;
2716 int i, error;
2717 boolean_t res;
2718
2719 /* We need some limit, might as well use PAGE_SIZE. */
2720 if (pnote == NULL || pnote->p_filesz > PAGE_SIZE)
2721 return (FALSE);
2722 ASSERT_VOP_LOCKED(imgp->vp, "parse_notes");
2723 if (pnote->p_offset > PAGE_SIZE ||
2724 pnote->p_filesz > PAGE_SIZE - pnote->p_offset) {
2725 buf = malloc(pnote->p_filesz, M_TEMP, M_NOWAIT);
2726 if (buf == NULL) {
2727 VOP_UNLOCK(imgp->vp);
2728 buf = malloc(pnote->p_filesz, M_TEMP, M_WAITOK);
2729 vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
2730 }
2731 error = vn_rdwr(UIO_READ, imgp->vp, buf, pnote->p_filesz,
2732 pnote->p_offset, UIO_SYSSPACE, IO_NODELOCKED,
2733 curthread->td_ucred, NOCRED, NULL, curthread);
2734 if (error != 0) {
2735 uprintf("i/o error PT_NOTE\n");
2736 goto retf;
2737 }
2738 note = note0 = (const Elf_Note *)buf;
2739 note_end = (const Elf_Note *)(buf + pnote->p_filesz);
2740 } else {
2741 note = note0 = (const Elf_Note *)(imgp->image_header +
2742 pnote->p_offset);
2743 note_end = (const Elf_Note *)(imgp->image_header +
2744 pnote->p_offset + pnote->p_filesz);
2745 buf = NULL;
2746 }
2747 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) {
2748 if (!aligned(note, Elf32_Addr) || (const char *)note_end -
2749 (const char *)note < sizeof(Elf_Note)) {
2750 goto retf;
2751 }
2752 if (note->n_namesz != checknote->n_namesz ||
2753 note->n_descsz != checknote->n_descsz ||
2754 note->n_type != checknote->n_type)
2755 goto nextnote;
2756 note_name = (const char *)(note + 1);
2757 if (note_name + checknote->n_namesz >=
2758 (const char *)note_end || strncmp(note_vendor,
2759 note_name, checknote->n_namesz) != 0)
2760 goto nextnote;
2761
2762 if (cb(note, cb_arg, &res))
2763 goto ret;
2764 nextnote:
2765 note = (const Elf_Note *)((const char *)(note + 1) +
2766 roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) +
2767 roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE));
2768 }
2769 retf:
2770 res = FALSE;
2771 ret:
2772 free(buf, M_TEMP);
2773 return (res);
2774 }
2775
2776 struct brandnote_cb_arg {
2777 Elf_Brandnote *brandnote;
2778 int32_t *osrel;
2779 };
2780
2781 static boolean_t
2782 brandnote_cb(const Elf_Note *note, void *arg0, boolean_t *res)
2783 {
2784 struct brandnote_cb_arg *arg;
2785
2786 arg = arg0;
2787
2788 /*
2789 * Fetch the osreldate for binary from the ELF OSABI-note if
2790 * necessary.
2791 */
2792 *res = (arg->brandnote->flags & BN_TRANSLATE_OSREL) != 0 &&
2793 arg->brandnote->trans_osrel != NULL ?
2794 arg->brandnote->trans_osrel(note, arg->osrel) : TRUE;
2795
2796 return (TRUE);
2797 }
2798
2799 static Elf_Note fctl_note = {
2800 .n_namesz = sizeof(FREEBSD_ABI_VENDOR),
2801 .n_descsz = sizeof(uint32_t),
2802 .n_type = NT_FREEBSD_FEATURE_CTL,
2803 };
2804
2805 struct fctl_cb_arg {
2806 boolean_t *has_fctl0;
2807 uint32_t *fctl0;
2808 };
2809
2810 static boolean_t
2811 note_fctl_cb(const Elf_Note *note, void *arg0, boolean_t *res)
2812 {
2813 struct fctl_cb_arg *arg;
2814 const Elf32_Word *desc;
2815 uintptr_t p;
2816
2817 arg = arg0;
2818 p = (uintptr_t)(note + 1);
2819 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
2820 desc = (const Elf32_Word *)p;
2821 *arg->has_fctl0 = TRUE;
2822 *arg->fctl0 = desc[0];
2823 *res = TRUE;
2824 return (TRUE);
2825 }
2826
2827 /*
2828 * Try to find the appropriate ABI-note section for checknote, fetch
2829 * the osreldate and feature control flags for binary from the ELF
2830 * OSABI-note. Only the first page of the image is searched, the same
2831 * as for headers.
2832 */
2833 static boolean_t
2834 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *brandnote,
2835 int32_t *osrel, boolean_t *has_fctl0, uint32_t *fctl0)
2836 {
2837 const Elf_Phdr *phdr;
2838 const Elf_Ehdr *hdr;
2839 struct brandnote_cb_arg b_arg;
2840 struct fctl_cb_arg f_arg;
2841 int i, j;
2842
2843 hdr = (const Elf_Ehdr *)imgp->image_header;
2844 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
2845 b_arg.brandnote = brandnote;
2846 b_arg.osrel = osrel;
2847 f_arg.has_fctl0 = has_fctl0;
2848 f_arg.fctl0 = fctl0;
2849
2850 for (i = 0; i < hdr->e_phnum; i++) {
2851 if (phdr[i].p_type == PT_NOTE && __elfN(parse_notes)(imgp,
2852 &brandnote->hdr, brandnote->vendor, &phdr[i], brandnote_cb,
2853 &b_arg)) {
2854 for (j = 0; j < hdr->e_phnum; j++) {
2855 if (phdr[j].p_type == PT_NOTE &&
2856 __elfN(parse_notes)(imgp, &fctl_note,
2857 FREEBSD_ABI_VENDOR, &phdr[j],
2858 note_fctl_cb, &f_arg))
2859 break;
2860 }
2861 return (TRUE);
2862 }
2863 }
2864 return (FALSE);
2865
2866 }
2867
2868 /*
2869 * Tell kern_execve.c about it, with a little help from the linker.
2870 */
2871 static struct execsw __elfN(execsw) = {
2872 .ex_imgact = __CONCAT(exec_, __elfN(imgact)),
2873 .ex_name = __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
2874 };
2875 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw));
2876
2877 static vm_prot_t
2878 __elfN(trans_prot)(Elf_Word flags)
2879 {
2880 vm_prot_t prot;
2881
2882 prot = 0;
2883 if (flags & PF_X)
2884 prot |= VM_PROT_EXECUTE;
2885 if (flags & PF_W)
2886 prot |= VM_PROT_WRITE;
2887 if (flags & PF_R)
2888 prot |= VM_PROT_READ;
2889 #if __ELF_WORD_SIZE == 32 && (defined(__amd64__) || defined(__i386__))
2890 if (i386_read_exec && (flags & PF_R))
2891 prot |= VM_PROT_EXECUTE;
2892 #endif
2893 return (prot);
2894 }
2895
2896 static Elf_Word
2897 __elfN(untrans_prot)(vm_prot_t prot)
2898 {
2899 Elf_Word flags;
2900
2901 flags = 0;
2902 if (prot & VM_PROT_EXECUTE)
2903 flags |= PF_X;
2904 if (prot & VM_PROT_READ)
2905 flags |= PF_R;
2906 if (prot & VM_PROT_WRITE)
2907 flags |= PF_W;
2908 return (flags);
2909 }
Cache object: d19c0ff0c9085c8bf46b2f7cf294cc76
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