1 /*- 2 * Copyright (c) 2000 David O'Brien 3 * Copyright (c) 1995-1996 Søren Schmidt 4 * Copyright (c) 1996 Peter Wemm 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer 12 * in this position and unchanged. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include "opt_capsicum.h" 35 #include "opt_compat.h" 36 #include "opt_gzio.h" 37 38 #include <sys/param.h> 39 #include <sys/capsicum.h> 40 #include <sys/exec.h> 41 #include <sys/fcntl.h> 42 #include <sys/gzio.h> 43 #include <sys/imgact.h> 44 #include <sys/imgact_elf.h> 45 #include <sys/jail.h> 46 #include <sys/kernel.h> 47 #include <sys/lock.h> 48 #include <sys/malloc.h> 49 #include <sys/mount.h> 50 #include <sys/mman.h> 51 #include <sys/namei.h> 52 #include <sys/pioctl.h> 53 #include <sys/proc.h> 54 #include <sys/procfs.h> 55 #include <sys/racct.h> 56 #include <sys/resourcevar.h> 57 #include <sys/rwlock.h> 58 #include <sys/sbuf.h> 59 #include <sys/sf_buf.h> 60 #include <sys/smp.h> 61 #include <sys/systm.h> 62 #include <sys/signalvar.h> 63 #include <sys/stat.h> 64 #include <sys/sx.h> 65 #include <sys/syscall.h> 66 #include <sys/sysctl.h> 67 #include <sys/sysent.h> 68 #include <sys/vnode.h> 69 #include <sys/syslog.h> 70 #include <sys/eventhandler.h> 71 #include <sys/user.h> 72 73 #include <vm/vm.h> 74 #include <vm/vm_kern.h> 75 #include <vm/vm_param.h> 76 #include <vm/pmap.h> 77 #include <vm/vm_map.h> 78 #include <vm/vm_object.h> 79 #include <vm/vm_extern.h> 80 81 #include <machine/elf.h> 82 #include <machine/md_var.h> 83 #ifdef __arm__ 84 #include <machine/acle-compat.h> 85 #endif 86 87 #define ELF_NOTE_ROUNDSIZE 4 88 #define OLD_EI_BRAND 8 89 90 static int __elfN(check_header)(const Elf_Ehdr *hdr); 91 static Elf_Brandinfo *__elfN(get_brandinfo)(struct image_params *imgp, 92 const char *interp, int interp_name_len, int32_t *osrel); 93 static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 94 u_long *entry, size_t pagesize); 95 static int __elfN(load_section)(struct image_params *imgp, vm_offset_t offset, 96 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot, 97 size_t pagesize); 98 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp); 99 static boolean_t __elfN(freebsd_trans_osrel)(const Elf_Note *note, 100 int32_t *osrel); 101 static boolean_t kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel); 102 static boolean_t __elfN(check_note)(struct image_params *imgp, 103 Elf_Brandnote *checknote, int32_t *osrel); 104 static vm_prot_t __elfN(trans_prot)(Elf_Word); 105 static Elf_Word __elfN(untrans_prot)(vm_prot_t); 106 107 SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0, 108 ""); 109 110 #define CORE_BUF_SIZE (16 * 1024) 111 112 int __elfN(fallback_brand) = -1; 113 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, 114 fallback_brand, CTLFLAG_RWTUN, &__elfN(fallback_brand), 0, 115 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort"); 116 117 static int elf_legacy_coredump = 0; 118 SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW, 119 &elf_legacy_coredump, 0, ""); 120 121 int __elfN(nxstack) = 122 #if defined(__amd64__) || defined(__powerpc64__) /* both 64 and 32 bit */ || \ 123 (defined(__arm__) && __ARM_ARCH >= 7) || defined(__aarch64__) 124 1; 125 #else 126 0; 127 #endif 128 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, 129 nxstack, CTLFLAG_RW, &__elfN(nxstack), 0, 130 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable non-executable stack"); 131 132 #if __ELF_WORD_SIZE == 32 133 #if defined(__amd64__) 134 int i386_read_exec = 0; 135 SYSCTL_INT(_kern_elf32, OID_AUTO, read_exec, CTLFLAG_RW, &i386_read_exec, 0, 136 "enable execution from readable segments"); 137 #endif 138 #endif 139 140 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS]; 141 142 #define trunc_page_ps(va, ps) rounddown2(va, ps) 143 #define round_page_ps(va, ps) roundup2(va, ps) 144 #define aligned(a, t) (trunc_page_ps((u_long)(a), sizeof(t)) == (u_long)(a)) 145 146 static const char FREEBSD_ABI_VENDOR[] = "FreeBSD"; 147 148 Elf_Brandnote __elfN(freebsd_brandnote) = { 149 .hdr.n_namesz = sizeof(FREEBSD_ABI_VENDOR), 150 .hdr.n_descsz = sizeof(int32_t), 151 .hdr.n_type = NT_FREEBSD_ABI_TAG, 152 .vendor = FREEBSD_ABI_VENDOR, 153 .flags = BN_TRANSLATE_OSREL, 154 .trans_osrel = __elfN(freebsd_trans_osrel) 155 }; 156 157 static boolean_t 158 __elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel) 159 { 160 uintptr_t p; 161 162 p = (uintptr_t)(note + 1); 163 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE); 164 *osrel = *(const int32_t *)(p); 165 166 return (TRUE); 167 } 168 169 static const char GNU_ABI_VENDOR[] = "GNU"; 170 static int GNU_KFREEBSD_ABI_DESC = 3; 171 172 Elf_Brandnote __elfN(kfreebsd_brandnote) = { 173 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 174 .hdr.n_descsz = 16, /* XXX at least 16 */ 175 .hdr.n_type = 1, 176 .vendor = GNU_ABI_VENDOR, 177 .flags = BN_TRANSLATE_OSREL, 178 .trans_osrel = kfreebsd_trans_osrel 179 }; 180 181 static boolean_t 182 kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel) 183 { 184 const Elf32_Word *desc; 185 uintptr_t p; 186 187 p = (uintptr_t)(note + 1); 188 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE); 189 190 desc = (const Elf32_Word *)p; 191 if (desc[0] != GNU_KFREEBSD_ABI_DESC) 192 return (FALSE); 193 194 /* 195 * Debian GNU/kFreeBSD embed the earliest compatible kernel version 196 * (__FreeBSD_version: <major><two digit minor>Rxx) in the LSB way. 197 */ 198 *osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3]; 199 200 return (TRUE); 201 } 202 203 int 204 __elfN(insert_brand_entry)(Elf_Brandinfo *entry) 205 { 206 int i; 207 208 for (i = 0; i < MAX_BRANDS; i++) { 209 if (elf_brand_list[i] == NULL) { 210 elf_brand_list[i] = entry; 211 break; 212 } 213 } 214 if (i == MAX_BRANDS) { 215 printf("WARNING: %s: could not insert brandinfo entry: %p\n", 216 __func__, entry); 217 return (-1); 218 } 219 return (0); 220 } 221 222 int 223 __elfN(remove_brand_entry)(Elf_Brandinfo *entry) 224 { 225 int i; 226 227 for (i = 0; i < MAX_BRANDS; i++) { 228 if (elf_brand_list[i] == entry) { 229 elf_brand_list[i] = NULL; 230 break; 231 } 232 } 233 if (i == MAX_BRANDS) 234 return (-1); 235 return (0); 236 } 237 238 int 239 __elfN(brand_inuse)(Elf_Brandinfo *entry) 240 { 241 struct proc *p; 242 int rval = FALSE; 243 244 sx_slock(&allproc_lock); 245 FOREACH_PROC_IN_SYSTEM(p) { 246 if (p->p_sysent == entry->sysvec) { 247 rval = TRUE; 248 break; 249 } 250 } 251 sx_sunlock(&allproc_lock); 252 253 return (rval); 254 } 255 256 static Elf_Brandinfo * 257 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp, 258 int interp_name_len, int32_t *osrel) 259 { 260 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header; 261 Elf_Brandinfo *bi, *bi_m; 262 boolean_t ret; 263 int i; 264 265 /* 266 * We support four types of branding -- (1) the ELF EI_OSABI field 267 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string 268 * branding w/in the ELF header, (3) path of the `interp_path' 269 * field, and (4) the ".note.ABI-tag" ELF section. 270 */ 271 272 /* Look for an ".note.ABI-tag" ELF section */ 273 bi_m = NULL; 274 for (i = 0; i < MAX_BRANDS; i++) { 275 bi = elf_brand_list[i]; 276 if (bi == NULL) 277 continue; 278 if (hdr->e_machine == bi->machine && (bi->flags & 279 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) { 280 ret = __elfN(check_note)(imgp, bi->brand_note, osrel); 281 /* Give brand a chance to veto check_note's guess */ 282 if (ret && bi->header_supported) 283 ret = bi->header_supported(imgp); 284 /* 285 * If note checker claimed the binary, but the 286 * interpreter path in the image does not 287 * match default one for the brand, try to 288 * search for other brands with the same 289 * interpreter. Either there is better brand 290 * with the right interpreter, or, failing 291 * this, we return first brand which accepted 292 * our note and, optionally, header. 293 */ 294 if (ret && bi_m == NULL && (strlen(bi->interp_path) + 295 1 != interp_name_len || strncmp(interp, 296 bi->interp_path, interp_name_len) != 0)) { 297 bi_m = bi; 298 ret = 0; 299 } 300 if (ret) 301 return (bi); 302 } 303 } 304 if (bi_m != NULL) 305 return (bi_m); 306 307 /* If the executable has a brand, search for it in the brand list. */ 308 for (i = 0; i < MAX_BRANDS; i++) { 309 bi = elf_brand_list[i]; 310 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY) 311 continue; 312 if (hdr->e_machine == bi->machine && 313 (hdr->e_ident[EI_OSABI] == bi->brand || 314 strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND], 315 bi->compat_3_brand, strlen(bi->compat_3_brand)) == 0)) { 316 /* Looks good, but give brand a chance to veto */ 317 if (!bi->header_supported || bi->header_supported(imgp)) 318 return (bi); 319 } 320 } 321 322 /* No known brand, see if the header is recognized by any brand */ 323 for (i = 0; i < MAX_BRANDS; i++) { 324 bi = elf_brand_list[i]; 325 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY || 326 bi->header_supported == NULL) 327 continue; 328 if (hdr->e_machine == bi->machine) { 329 ret = bi->header_supported(imgp); 330 if (ret) 331 return (bi); 332 } 333 } 334 335 /* Lacking a known brand, search for a recognized interpreter. */ 336 if (interp != NULL) { 337 for (i = 0; i < MAX_BRANDS; i++) { 338 bi = elf_brand_list[i]; 339 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY) 340 continue; 341 if (hdr->e_machine == bi->machine && 342 /* ELF image p_filesz includes terminating zero */ 343 strlen(bi->interp_path) + 1 == interp_name_len && 344 strncmp(interp, bi->interp_path, interp_name_len) 345 == 0) 346 return (bi); 347 } 348 } 349 350 /* Lacking a recognized interpreter, try the default brand */ 351 for (i = 0; i < MAX_BRANDS; i++) { 352 bi = elf_brand_list[i]; 353 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY) 354 continue; 355 if (hdr->e_machine == bi->machine && 356 __elfN(fallback_brand) == bi->brand) 357 return (bi); 358 } 359 return (NULL); 360 } 361 362 static int 363 __elfN(check_header)(const Elf_Ehdr *hdr) 364 { 365 Elf_Brandinfo *bi; 366 int i; 367 368 if (!IS_ELF(*hdr) || 369 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 370 hdr->e_ident[EI_DATA] != ELF_TARG_DATA || 371 hdr->e_ident[EI_VERSION] != EV_CURRENT || 372 hdr->e_phentsize != sizeof(Elf_Phdr) || 373 hdr->e_version != ELF_TARG_VER) 374 return (ENOEXEC); 375 376 /* 377 * Make sure we have at least one brand for this machine. 378 */ 379 380 for (i = 0; i < MAX_BRANDS; i++) { 381 bi = elf_brand_list[i]; 382 if (bi != NULL && bi->machine == hdr->e_machine) 383 break; 384 } 385 if (i == MAX_BRANDS) 386 return (ENOEXEC); 387 388 return (0); 389 } 390 391 static int 392 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 393 vm_offset_t start, vm_offset_t end, vm_prot_t prot) 394 { 395 struct sf_buf *sf; 396 int error; 397 vm_offset_t off; 398 399 /* 400 * Create the page if it doesn't exist yet. Ignore errors. 401 */ 402 vm_map_lock(map); 403 vm_map_insert(map, NULL, 0, trunc_page(start), round_page(end), 404 VM_PROT_ALL, VM_PROT_ALL, 0); 405 vm_map_unlock(map); 406 407 /* 408 * Find the page from the underlying object. 409 */ 410 if (object) { 411 sf = vm_imgact_map_page(object, offset); 412 if (sf == NULL) 413 return (KERN_FAILURE); 414 off = offset - trunc_page(offset); 415 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start, 416 end - start); 417 vm_imgact_unmap_page(sf); 418 if (error) { 419 return (KERN_FAILURE); 420 } 421 } 422 423 return (KERN_SUCCESS); 424 } 425 426 static int 427 __elfN(map_insert)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 428 vm_offset_t start, vm_offset_t end, vm_prot_t prot, int cow) 429 { 430 struct sf_buf *sf; 431 vm_offset_t off; 432 vm_size_t sz; 433 int error, rv; 434 435 if (start != trunc_page(start)) { 436 rv = __elfN(map_partial)(map, object, offset, start, 437 round_page(start), prot); 438 if (rv) 439 return (rv); 440 offset += round_page(start) - start; 441 start = round_page(start); 442 } 443 if (end != round_page(end)) { 444 rv = __elfN(map_partial)(map, object, offset + 445 trunc_page(end) - start, trunc_page(end), end, prot); 446 if (rv) 447 return (rv); 448 end = trunc_page(end); 449 } 450 if (end > start) { 451 if (offset & PAGE_MASK) { 452 /* 453 * The mapping is not page aligned. This means we have 454 * to copy the data. Sigh. 455 */ 456 rv = vm_map_find(map, NULL, 0, &start, end - start, 0, 457 VMFS_NO_SPACE, prot | VM_PROT_WRITE, VM_PROT_ALL, 458 0); 459 if (rv) 460 return (rv); 461 if (object == NULL) 462 return (KERN_SUCCESS); 463 for (; start < end; start += sz) { 464 sf = vm_imgact_map_page(object, offset); 465 if (sf == NULL) 466 return (KERN_FAILURE); 467 off = offset - trunc_page(offset); 468 sz = end - start; 469 if (sz > PAGE_SIZE - off) 470 sz = PAGE_SIZE - off; 471 error = copyout((caddr_t)sf_buf_kva(sf) + off, 472 (caddr_t)start, sz); 473 vm_imgact_unmap_page(sf); 474 if (error) { 475 return (KERN_FAILURE); 476 } 477 offset += sz; 478 } 479 rv = KERN_SUCCESS; 480 } else { 481 vm_object_reference(object); 482 vm_map_lock(map); 483 rv = vm_map_insert(map, object, offset, start, end, 484 prot, VM_PROT_ALL, cow); 485 vm_map_unlock(map); 486 if (rv != KERN_SUCCESS) 487 vm_object_deallocate(object); 488 } 489 return (rv); 490 } else { 491 return (KERN_SUCCESS); 492 } 493 } 494 495 static int 496 __elfN(load_section)(struct image_params *imgp, vm_offset_t offset, 497 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot, 498 size_t pagesize) 499 { 500 struct sf_buf *sf; 501 size_t map_len; 502 vm_map_t map; 503 vm_object_t object; 504 vm_offset_t map_addr; 505 int error, rv, cow; 506 size_t copy_len; 507 vm_offset_t file_addr; 508 509 /* 510 * It's necessary to fail if the filsz + offset taken from the 511 * header is greater than the actual file pager object's size. 512 * If we were to allow this, then the vm_map_find() below would 513 * walk right off the end of the file object and into the ether. 514 * 515 * While I'm here, might as well check for something else that 516 * is invalid: filsz cannot be greater than memsz. 517 */ 518 if ((off_t)filsz + offset > imgp->attr->va_size || filsz > memsz) { 519 uprintf("elf_load_section: truncated ELF file\n"); 520 return (ENOEXEC); 521 } 522 523 object = imgp->object; 524 map = &imgp->proc->p_vmspace->vm_map; 525 map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize); 526 file_addr = trunc_page_ps(offset, pagesize); 527 528 /* 529 * We have two choices. We can either clear the data in the last page 530 * of an oversized mapping, or we can start the anon mapping a page 531 * early and copy the initialized data into that first page. We 532 * choose the second.. 533 */ 534 if (memsz > filsz) 535 map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr; 536 else 537 map_len = round_page_ps(offset + filsz, pagesize) - file_addr; 538 539 if (map_len != 0) { 540 /* cow flags: don't dump readonly sections in core */ 541 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT | 542 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP); 543 544 rv = __elfN(map_insert)(map, 545 object, 546 file_addr, /* file offset */ 547 map_addr, /* virtual start */ 548 map_addr + map_len,/* virtual end */ 549 prot, 550 cow); 551 if (rv != KERN_SUCCESS) 552 return (EINVAL); 553 554 /* we can stop now if we've covered it all */ 555 if (memsz == filsz) { 556 return (0); 557 } 558 } 559 560 561 /* 562 * We have to get the remaining bit of the file into the first part 563 * of the oversized map segment. This is normally because the .data 564 * segment in the file is extended to provide bss. It's a neat idea 565 * to try and save a page, but it's a pain in the behind to implement. 566 */ 567 copy_len = (offset + filsz) - trunc_page_ps(offset + filsz, pagesize); 568 map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize); 569 map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) - 570 map_addr; 571 572 /* This had damn well better be true! */ 573 if (map_len != 0) { 574 rv = __elfN(map_insert)(map, NULL, 0, map_addr, map_addr + 575 map_len, VM_PROT_ALL, 0); 576 if (rv != KERN_SUCCESS) { 577 return (EINVAL); 578 } 579 } 580 581 if (copy_len != 0) { 582 vm_offset_t off; 583 584 sf = vm_imgact_map_page(object, offset + filsz); 585 if (sf == NULL) 586 return (EIO); 587 588 /* send the page fragment to user space */ 589 off = trunc_page_ps(offset + filsz, pagesize) - 590 trunc_page(offset + filsz); 591 error = copyout((caddr_t)sf_buf_kva(sf) + off, 592 (caddr_t)map_addr, copy_len); 593 vm_imgact_unmap_page(sf); 594 if (error) { 595 return (error); 596 } 597 } 598 599 /* 600 * set it to the specified protection. 601 * XXX had better undo the damage from pasting over the cracks here! 602 */ 603 vm_map_protect(map, trunc_page(map_addr), round_page(map_addr + 604 map_len), prot, FALSE); 605 606 return (0); 607 } 608 609 /* 610 * Load the file "file" into memory. It may be either a shared object 611 * or an executable. 612 * 613 * The "addr" reference parameter is in/out. On entry, it specifies 614 * the address where a shared object should be loaded. If the file is 615 * an executable, this value is ignored. On exit, "addr" specifies 616 * where the file was actually loaded. 617 * 618 * The "entry" reference parameter is out only. On exit, it specifies 619 * the entry point for the loaded file. 620 */ 621 static int 622 __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 623 u_long *entry, size_t pagesize) 624 { 625 struct { 626 struct nameidata nd; 627 struct vattr attr; 628 struct image_params image_params; 629 } *tempdata; 630 const Elf_Ehdr *hdr = NULL; 631 const Elf_Phdr *phdr = NULL; 632 struct nameidata *nd; 633 struct vattr *attr; 634 struct image_params *imgp; 635 vm_prot_t prot; 636 u_long rbase; 637 u_long base_addr = 0; 638 int error, i, numsegs; 639 640 #ifdef CAPABILITY_MODE 641 /* 642 * XXXJA: This check can go away once we are sufficiently confident 643 * that the checks in namei() are correct. 644 */ 645 if (IN_CAPABILITY_MODE(curthread)) 646 return (ECAPMODE); 647 #endif 648 649 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK); 650 nd = &tempdata->nd; 651 attr = &tempdata->attr; 652 imgp = &tempdata->image_params; 653 654 /* 655 * Initialize part of the common data 656 */ 657 imgp->proc = p; 658 imgp->attr = attr; 659 imgp->firstpage = NULL; 660 imgp->image_header = NULL; 661 imgp->object = NULL; 662 imgp->execlabel = NULL; 663 664 NDINIT(nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_SYSSPACE, file, curthread); 665 if ((error = namei(nd)) != 0) { 666 nd->ni_vp = NULL; 667 goto fail; 668 } 669 NDFREE(nd, NDF_ONLY_PNBUF); 670 imgp->vp = nd->ni_vp; 671 672 /* 673 * Check permissions, modes, uid, etc on the file, and "open" it. 674 */ 675 error = exec_check_permissions(imgp); 676 if (error) 677 goto fail; 678 679 error = exec_map_first_page(imgp); 680 if (error) 681 goto fail; 682 683 /* 684 * Also make certain that the interpreter stays the same, so set 685 * its VV_TEXT flag, too. 686 */ 687 VOP_SET_TEXT(nd->ni_vp); 688 689 imgp->object = nd->ni_vp->v_object; 690 691 hdr = (const Elf_Ehdr *)imgp->image_header; 692 if ((error = __elfN(check_header)(hdr)) != 0) 693 goto fail; 694 if (hdr->e_type == ET_DYN) 695 rbase = *addr; 696 else if (hdr->e_type == ET_EXEC) 697 rbase = 0; 698 else { 699 error = ENOEXEC; 700 goto fail; 701 } 702 703 /* Only support headers that fit within first page for now */ 704 if ((hdr->e_phoff > PAGE_SIZE) || 705 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) { 706 error = ENOEXEC; 707 goto fail; 708 } 709 710 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 711 if (!aligned(phdr, Elf_Addr)) { 712 error = ENOEXEC; 713 goto fail; 714 } 715 716 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) { 717 if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) { 718 /* Loadable segment */ 719 prot = __elfN(trans_prot)(phdr[i].p_flags); 720 error = __elfN(load_section)(imgp, phdr[i].p_offset, 721 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase, 722 phdr[i].p_memsz, phdr[i].p_filesz, prot, pagesize); 723 if (error != 0) 724 goto fail; 725 /* 726 * Establish the base address if this is the 727 * first segment. 728 */ 729 if (numsegs == 0) 730 base_addr = trunc_page(phdr[i].p_vaddr + 731 rbase); 732 numsegs++; 733 } 734 } 735 *addr = base_addr; 736 *entry = (unsigned long)hdr->e_entry + rbase; 737 738 fail: 739 if (imgp->firstpage) 740 exec_unmap_first_page(imgp); 741 742 if (nd->ni_vp) 743 vput(nd->ni_vp); 744 745 free(tempdata, M_TEMP); 746 747 return (error); 748 } 749 750 static int 751 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp) 752 { 753 struct thread *td; 754 const Elf_Ehdr *hdr; 755 const Elf_Phdr *phdr; 756 Elf_Auxargs *elf_auxargs; 757 struct vmspace *vmspace; 758 const char *err_str, *newinterp; 759 char *interp, *interp_buf, *path; 760 Elf_Brandinfo *brand_info; 761 struct sysentvec *sv; 762 vm_prot_t prot; 763 u_long text_size, data_size, total_size, text_addr, data_addr; 764 u_long seg_size, seg_addr, addr, baddr, et_dyn_addr, entry, proghdr; 765 int32_t osrel; 766 int error, i, n, interp_name_len, have_interp; 767 768 hdr = (const Elf_Ehdr *)imgp->image_header; 769 770 /* 771 * Do we have a valid ELF header ? 772 * 773 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later 774 * if particular brand doesn't support it. 775 */ 776 if (__elfN(check_header)(hdr) != 0 || 777 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)) 778 return (-1); 779 780 /* 781 * From here on down, we return an errno, not -1, as we've 782 * detected an ELF file. 783 */ 784 785 if ((hdr->e_phoff > PAGE_SIZE) || 786 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) { 787 /* Only support headers in first page for now */ 788 uprintf("Program headers not in the first page\n"); 789 return (ENOEXEC); 790 } 791 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 792 if (!aligned(phdr, Elf_Addr)) { 793 uprintf("Unaligned program headers\n"); 794 return (ENOEXEC); 795 } 796 797 n = error = 0; 798 baddr = 0; 799 osrel = 0; 800 text_size = data_size = total_size = text_addr = data_addr = 0; 801 entry = proghdr = 0; 802 interp_name_len = 0; 803 err_str = newinterp = NULL; 804 interp = interp_buf = NULL; 805 td = curthread; 806 807 for (i = 0; i < hdr->e_phnum; i++) { 808 switch (phdr[i].p_type) { 809 case PT_LOAD: 810 if (n == 0) 811 baddr = phdr[i].p_vaddr; 812 n++; 813 break; 814 case PT_INTERP: 815 /* Path to interpreter */ 816 if (phdr[i].p_filesz > MAXPATHLEN) { 817 uprintf("Invalid PT_INTERP\n"); 818 error = ENOEXEC; 819 goto ret; 820 } 821 if (interp != NULL) { 822 uprintf("Multiple PT_INTERP headers\n"); 823 error = ENOEXEC; 824 goto ret; 825 } 826 interp_name_len = phdr[i].p_filesz; 827 if (phdr[i].p_offset > PAGE_SIZE || 828 interp_name_len > PAGE_SIZE - phdr[i].p_offset) { 829 VOP_UNLOCK(imgp->vp, 0); 830 interp_buf = malloc(interp_name_len + 1, M_TEMP, 831 M_WAITOK); 832 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 833 error = vn_rdwr(UIO_READ, imgp->vp, interp_buf, 834 interp_name_len, phdr[i].p_offset, 835 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 836 NOCRED, NULL, td); 837 if (error != 0) { 838 uprintf("i/o error PT_INTERP\n"); 839 goto ret; 840 } 841 interp_buf[interp_name_len] = '\0'; 842 interp = interp_buf; 843 } else { 844 interp = __DECONST(char *, imgp->image_header) + 845 phdr[i].p_offset; 846 } 847 break; 848 case PT_GNU_STACK: 849 if (__elfN(nxstack)) 850 imgp->stack_prot = 851 __elfN(trans_prot)(phdr[i].p_flags); 852 imgp->stack_sz = phdr[i].p_memsz; 853 break; 854 } 855 } 856 857 brand_info = __elfN(get_brandinfo)(imgp, interp, interp_name_len, 858 &osrel); 859 if (brand_info == NULL) { 860 uprintf("ELF binary type \"%u\" not known.\n", 861 hdr->e_ident[EI_OSABI]); 862 error = ENOEXEC; 863 goto ret; 864 } 865 if (hdr->e_type == ET_DYN) { 866 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) { 867 uprintf("Cannot execute shared object\n"); 868 error = ENOEXEC; 869 goto ret; 870 } 871 /* 872 * Honour the base load address from the dso if it is 873 * non-zero for some reason. 874 */ 875 if (baddr == 0) 876 et_dyn_addr = ET_DYN_LOAD_ADDR; 877 else 878 et_dyn_addr = 0; 879 } else 880 et_dyn_addr = 0; 881 sv = brand_info->sysvec; 882 if (interp != NULL && brand_info->interp_newpath != NULL) 883 newinterp = brand_info->interp_newpath; 884 885 /* 886 * Avoid a possible deadlock if the current address space is destroyed 887 * and that address space maps the locked vnode. In the common case, 888 * the locked vnode's v_usecount is decremented but remains greater 889 * than zero. Consequently, the vnode lock is not needed by vrele(). 890 * However, in cases where the vnode lock is external, such as nullfs, 891 * v_usecount may become zero. 892 * 893 * The VV_TEXT flag prevents modifications to the executable while 894 * the vnode is unlocked. 895 */ 896 VOP_UNLOCK(imgp->vp, 0); 897 898 error = exec_new_vmspace(imgp, sv); 899 imgp->proc->p_sysent = sv; 900 901 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 902 if (error != 0) 903 goto ret; 904 905 for (i = 0; i < hdr->e_phnum; i++) { 906 switch (phdr[i].p_type) { 907 case PT_LOAD: /* Loadable segment */ 908 if (phdr[i].p_memsz == 0) 909 break; 910 prot = __elfN(trans_prot)(phdr[i].p_flags); 911 error = __elfN(load_section)(imgp, phdr[i].p_offset, 912 (caddr_t)(uintptr_t)phdr[i].p_vaddr + et_dyn_addr, 913 phdr[i].p_memsz, phdr[i].p_filesz, prot, 914 sv->sv_pagesize); 915 if (error != 0) 916 goto ret; 917 918 /* 919 * If this segment contains the program headers, 920 * remember their virtual address for the AT_PHDR 921 * aux entry. Static binaries don't usually include 922 * a PT_PHDR entry. 923 */ 924 if (phdr[i].p_offset == 0 && 925 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize 926 <= phdr[i].p_filesz) 927 proghdr = phdr[i].p_vaddr + hdr->e_phoff + 928 et_dyn_addr; 929 930 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr); 931 seg_size = round_page(phdr[i].p_memsz + 932 phdr[i].p_vaddr + et_dyn_addr - seg_addr); 933 934 /* 935 * Make the largest executable segment the official 936 * text segment and all others data. 937 * 938 * Note that obreak() assumes that data_addr + 939 * data_size == end of data load area, and the ELF 940 * file format expects segments to be sorted by 941 * address. If multiple data segments exist, the 942 * last one will be used. 943 */ 944 945 if (phdr[i].p_flags & PF_X && text_size < seg_size) { 946 text_size = seg_size; 947 text_addr = seg_addr; 948 } else { 949 data_size = seg_size; 950 data_addr = seg_addr; 951 } 952 total_size += seg_size; 953 break; 954 case PT_PHDR: /* Program header table info */ 955 proghdr = phdr[i].p_vaddr + et_dyn_addr; 956 break; 957 default: 958 break; 959 } 960 } 961 962 if (data_addr == 0 && data_size == 0) { 963 data_addr = text_addr; 964 data_size = text_size; 965 } 966 967 entry = (u_long)hdr->e_entry + et_dyn_addr; 968 969 /* 970 * Check limits. It should be safe to check the 971 * limits after loading the segments since we do 972 * not actually fault in all the segments pages. 973 */ 974 PROC_LOCK(imgp->proc); 975 if (data_size > lim_cur_proc(imgp->proc, RLIMIT_DATA)) 976 err_str = "Data segment size exceeds process limit"; 977 else if (text_size > maxtsiz) 978 err_str = "Text segment size exceeds system limit"; 979 else if (total_size > lim_cur_proc(imgp->proc, RLIMIT_VMEM)) 980 err_str = "Total segment size exceeds process limit"; 981 else if (racct_set(imgp->proc, RACCT_DATA, data_size) != 0) 982 err_str = "Data segment size exceeds resource limit"; 983 else if (racct_set(imgp->proc, RACCT_VMEM, total_size) != 0) 984 err_str = "Total segment size exceeds resource limit"; 985 if (err_str != NULL) { 986 PROC_UNLOCK(imgp->proc); 987 uprintf("%s\n", err_str); 988 error = ENOMEM; 989 goto ret; 990 } 991 992 vmspace = imgp->proc->p_vmspace; 993 vmspace->vm_tsize = text_size >> PAGE_SHIFT; 994 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr; 995 vmspace->vm_dsize = data_size >> PAGE_SHIFT; 996 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr; 997 998 /* 999 * We load the dynamic linker where a userland call 1000 * to mmap(0, ...) would put it. The rationale behind this 1001 * calculation is that it leaves room for the heap to grow to 1002 * its maximum allowed size. 1003 */ 1004 addr = round_page((vm_offset_t)vmspace->vm_daddr + lim_max(td, 1005 RLIMIT_DATA)); 1006 PROC_UNLOCK(imgp->proc); 1007 1008 imgp->entry_addr = entry; 1009 1010 if (interp != NULL) { 1011 have_interp = FALSE; 1012 VOP_UNLOCK(imgp->vp, 0); 1013 if (brand_info->emul_path != NULL && 1014 brand_info->emul_path[0] != '\0') { 1015 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1016 snprintf(path, MAXPATHLEN, "%s%s", 1017 brand_info->emul_path, interp); 1018 error = __elfN(load_file)(imgp->proc, path, &addr, 1019 &imgp->entry_addr, sv->sv_pagesize); 1020 free(path, M_TEMP); 1021 if (error == 0) 1022 have_interp = TRUE; 1023 } 1024 if (!have_interp && newinterp != NULL && 1025 (brand_info->interp_path == NULL || 1026 strcmp(interp, brand_info->interp_path) == 0)) { 1027 error = __elfN(load_file)(imgp->proc, newinterp, &addr, 1028 &imgp->entry_addr, sv->sv_pagesize); 1029 if (error == 0) 1030 have_interp = TRUE; 1031 } 1032 if (!have_interp) { 1033 error = __elfN(load_file)(imgp->proc, interp, &addr, 1034 &imgp->entry_addr, sv->sv_pagesize); 1035 } 1036 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 1037 if (error != 0) { 1038 uprintf("ELF interpreter %s not found, error %d\n", 1039 interp, error); 1040 goto ret; 1041 } 1042 } else 1043 addr = et_dyn_addr; 1044 1045 /* 1046 * Construct auxargs table (used by the fixup routine) 1047 */ 1048 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK); 1049 elf_auxargs->execfd = -1; 1050 elf_auxargs->phdr = proghdr; 1051 elf_auxargs->phent = hdr->e_phentsize; 1052 elf_auxargs->phnum = hdr->e_phnum; 1053 elf_auxargs->pagesz = PAGE_SIZE; 1054 elf_auxargs->base = addr; 1055 elf_auxargs->flags = 0; 1056 elf_auxargs->entry = entry; 1057 elf_auxargs->hdr_eflags = hdr->e_flags; 1058 1059 imgp->auxargs = elf_auxargs; 1060 imgp->interpreted = 0; 1061 imgp->reloc_base = addr; 1062 imgp->proc->p_osrel = osrel; 1063 1064 ret: 1065 free(interp_buf, M_TEMP); 1066 return (error); 1067 } 1068 1069 #define suword __CONCAT(suword, __ELF_WORD_SIZE) 1070 1071 int 1072 __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp) 1073 { 1074 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs; 1075 Elf_Addr *base; 1076 Elf_Addr *pos; 1077 1078 base = (Elf_Addr *)*stack_base; 1079 pos = base + (imgp->args->argc + imgp->args->envc + 2); 1080 1081 if (args->execfd != -1) 1082 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 1083 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 1084 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 1085 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 1086 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 1087 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 1088 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 1089 AUXARGS_ENTRY(pos, AT_BASE, args->base); 1090 #ifdef AT_EHDRFLAGS 1091 AUXARGS_ENTRY(pos, AT_EHDRFLAGS, args->hdr_eflags); 1092 #endif 1093 if (imgp->execpathp != 0) 1094 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp); 1095 AUXARGS_ENTRY(pos, AT_OSRELDATE, 1096 imgp->proc->p_ucred->cr_prison->pr_osreldate); 1097 if (imgp->canary != 0) { 1098 AUXARGS_ENTRY(pos, AT_CANARY, imgp->canary); 1099 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen); 1100 } 1101 AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus); 1102 if (imgp->pagesizes != 0) { 1103 AUXARGS_ENTRY(pos, AT_PAGESIZES, imgp->pagesizes); 1104 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen); 1105 } 1106 if (imgp->sysent->sv_timekeep_base != 0) { 1107 AUXARGS_ENTRY(pos, AT_TIMEKEEP, 1108 imgp->sysent->sv_timekeep_base); 1109 } 1110 AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj 1111 != NULL && imgp->stack_prot != 0 ? imgp->stack_prot : 1112 imgp->sysent->sv_stackprot); 1113 AUXARGS_ENTRY(pos, AT_NULL, 0); 1114 1115 free(imgp->auxargs, M_TEMP); 1116 imgp->auxargs = NULL; 1117 1118 base--; 1119 suword(base, (long)imgp->args->argc); 1120 *stack_base = (register_t *)base; 1121 return (0); 1122 } 1123 1124 /* 1125 * Code for generating ELF core dumps. 1126 */ 1127 1128 typedef void (*segment_callback)(vm_map_entry_t, void *); 1129 1130 /* Closure for cb_put_phdr(). */ 1131 struct phdr_closure { 1132 Elf_Phdr *phdr; /* Program header to fill in */ 1133 Elf_Off offset; /* Offset of segment in core file */ 1134 }; 1135 1136 /* Closure for cb_size_segment(). */ 1137 struct sseg_closure { 1138 int count; /* Count of writable segments. */ 1139 size_t size; /* Total size of all writable segments. */ 1140 }; 1141 1142 typedef void (*outfunc_t)(void *, struct sbuf *, size_t *); 1143 1144 struct note_info { 1145 int type; /* Note type. */ 1146 outfunc_t outfunc; /* Output function. */ 1147 void *outarg; /* Argument for the output function. */ 1148 size_t outsize; /* Output size. */ 1149 TAILQ_ENTRY(note_info) link; /* Link to the next note info. */ 1150 }; 1151 1152 TAILQ_HEAD(note_info_list, note_info); 1153 1154 /* Coredump output parameters. */ 1155 struct coredump_params { 1156 off_t offset; 1157 struct ucred *active_cred; 1158 struct ucred *file_cred; 1159 struct thread *td; 1160 struct vnode *vp; 1161 struct gzio_stream *gzs; 1162 }; 1163 1164 static void cb_put_phdr(vm_map_entry_t, void *); 1165 static void cb_size_segment(vm_map_entry_t, void *); 1166 static int core_write(struct coredump_params *, void *, size_t, off_t, 1167 enum uio_seg); 1168 static void each_writable_segment(struct thread *, segment_callback, void *); 1169 static int __elfN(corehdr)(struct coredump_params *, int, void *, size_t, 1170 struct note_info_list *, size_t); 1171 static void __elfN(prepare_notes)(struct thread *, struct note_info_list *, 1172 size_t *); 1173 static void __elfN(puthdr)(struct thread *, void *, size_t, int, size_t); 1174 static void __elfN(putnote)(struct note_info *, struct sbuf *); 1175 static size_t register_note(struct note_info_list *, int, outfunc_t, void *); 1176 static int sbuf_drain_core_output(void *, const char *, int); 1177 static int sbuf_drain_count(void *arg, const char *data, int len); 1178 1179 static void __elfN(note_fpregset)(void *, struct sbuf *, size_t *); 1180 static void __elfN(note_prpsinfo)(void *, struct sbuf *, size_t *); 1181 static void __elfN(note_prstatus)(void *, struct sbuf *, size_t *); 1182 static void __elfN(note_threadmd)(void *, struct sbuf *, size_t *); 1183 static void __elfN(note_thrmisc)(void *, struct sbuf *, size_t *); 1184 static void __elfN(note_procstat_auxv)(void *, struct sbuf *, size_t *); 1185 static void __elfN(note_procstat_proc)(void *, struct sbuf *, size_t *); 1186 static void __elfN(note_procstat_psstrings)(void *, struct sbuf *, size_t *); 1187 static void note_procstat_files(void *, struct sbuf *, size_t *); 1188 static void note_procstat_groups(void *, struct sbuf *, size_t *); 1189 static void note_procstat_osrel(void *, struct sbuf *, size_t *); 1190 static void note_procstat_rlimit(void *, struct sbuf *, size_t *); 1191 static void note_procstat_umask(void *, struct sbuf *, size_t *); 1192 static void note_procstat_vmmap(void *, struct sbuf *, size_t *); 1193 1194 #ifdef GZIO 1195 extern int compress_user_cores_gzlevel; 1196 1197 /* 1198 * Write out a core segment to the compression stream. 1199 */ 1200 static int 1201 compress_chunk(struct coredump_params *p, char *base, char *buf, u_int len) 1202 { 1203 u_int chunk_len; 1204 int error; 1205 1206 while (len > 0) { 1207 chunk_len = MIN(len, CORE_BUF_SIZE); 1208 copyin(base, buf, chunk_len); 1209 error = gzio_write(p->gzs, buf, chunk_len); 1210 if (error != 0) 1211 break; 1212 base += chunk_len; 1213 len -= chunk_len; 1214 } 1215 return (error); 1216 } 1217 1218 static int 1219 core_gz_write(void *base, size_t len, off_t offset, void *arg) 1220 { 1221 1222 return (core_write((struct coredump_params *)arg, base, len, offset, 1223 UIO_SYSSPACE)); 1224 } 1225 #endif /* GZIO */ 1226 1227 static int 1228 core_write(struct coredump_params *p, void *base, size_t len, off_t offset, 1229 enum uio_seg seg) 1230 { 1231 1232 return (vn_rdwr_inchunks(UIO_WRITE, p->vp, base, len, offset, 1233 seg, IO_UNIT | IO_DIRECT | IO_RANGELOCKED, 1234 p->active_cred, p->file_cred, NULL, p->td)); 1235 } 1236 1237 static int 1238 core_output(void *base, size_t len, off_t offset, struct coredump_params *p, 1239 void *tmpbuf) 1240 { 1241 1242 #ifdef GZIO 1243 if (p->gzs != NULL) 1244 return (compress_chunk(p, base, tmpbuf, len)); 1245 #endif 1246 return (core_write(p, base, len, offset, UIO_USERSPACE)); 1247 } 1248 1249 /* 1250 * Drain into a core file. 1251 */ 1252 static int 1253 sbuf_drain_core_output(void *arg, const char *data, int len) 1254 { 1255 struct coredump_params *p; 1256 int error, locked; 1257 1258 p = (struct coredump_params *)arg; 1259 1260 /* 1261 * Some kern_proc out routines that print to this sbuf may 1262 * call us with the process lock held. Draining with the 1263 * non-sleepable lock held is unsafe. The lock is needed for 1264 * those routines when dumping a live process. In our case we 1265 * can safely release the lock before draining and acquire 1266 * again after. 1267 */ 1268 locked = PROC_LOCKED(p->td->td_proc); 1269 if (locked) 1270 PROC_UNLOCK(p->td->td_proc); 1271 #ifdef GZIO 1272 if (p->gzs != NULL) 1273 error = gzio_write(p->gzs, __DECONST(char *, data), len); 1274 else 1275 #endif 1276 error = core_write(p, __DECONST(void *, data), len, p->offset, 1277 UIO_SYSSPACE); 1278 if (locked) 1279 PROC_LOCK(p->td->td_proc); 1280 if (error != 0) 1281 return (-error); 1282 p->offset += len; 1283 return (len); 1284 } 1285 1286 /* 1287 * Drain into a counter. 1288 */ 1289 static int 1290 sbuf_drain_count(void *arg, const char *data __unused, int len) 1291 { 1292 size_t *sizep; 1293 1294 sizep = (size_t *)arg; 1295 *sizep += len; 1296 return (len); 1297 } 1298 1299 int 1300 __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags) 1301 { 1302 struct ucred *cred = td->td_ucred; 1303 int error = 0; 1304 struct sseg_closure seginfo; 1305 struct note_info_list notelst; 1306 struct coredump_params params; 1307 struct note_info *ninfo; 1308 void *hdr, *tmpbuf; 1309 size_t hdrsize, notesz, coresize; 1310 #ifdef GZIO 1311 boolean_t compress; 1312 1313 compress = (flags & IMGACT_CORE_COMPRESS) != 0; 1314 #endif 1315 hdr = NULL; 1316 tmpbuf = NULL; 1317 TAILQ_INIT(¬elst); 1318 1319 /* Size the program segments. */ 1320 seginfo.count = 0; 1321 seginfo.size = 0; 1322 each_writable_segment(td, cb_size_segment, &seginfo); 1323 1324 /* 1325 * Collect info about the core file header area. 1326 */ 1327 hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count); 1328 __elfN(prepare_notes)(td, ¬elst, ¬esz); 1329 coresize = round_page(hdrsize + notesz) + seginfo.size; 1330 1331 /* Set up core dump parameters. */ 1332 params.offset = 0; 1333 params.active_cred = cred; 1334 params.file_cred = NOCRED; 1335 params.td = td; 1336 params.vp = vp; 1337 params.gzs = NULL; 1338 1339 #ifdef RACCT 1340 if (racct_enable) { 1341 PROC_LOCK(td->td_proc); 1342 error = racct_add(td->td_proc, RACCT_CORE, coresize); 1343 PROC_UNLOCK(td->td_proc); 1344 if (error != 0) { 1345 error = EFAULT; 1346 goto done; 1347 } 1348 } 1349 #endif 1350 if (coresize >= limit) { 1351 error = EFAULT; 1352 goto done; 1353 } 1354 1355 #ifdef GZIO 1356 /* Create a compression stream if necessary. */ 1357 if (compress) { 1358 params.gzs = gzio_init(core_gz_write, GZIO_DEFLATE, 1359 CORE_BUF_SIZE, compress_user_cores_gzlevel, ¶ms); 1360 if (params.gzs == NULL) { 1361 error = EFAULT; 1362 goto done; 1363 } 1364 tmpbuf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO); 1365 } 1366 #endif 1367 1368 /* 1369 * Allocate memory for building the header, fill it up, 1370 * and write it out following the notes. 1371 */ 1372 hdr = malloc(hdrsize, M_TEMP, M_WAITOK); 1373 error = __elfN(corehdr)(¶ms, seginfo.count, hdr, hdrsize, ¬elst, 1374 notesz); 1375 1376 /* Write the contents of all of the writable segments. */ 1377 if (error == 0) { 1378 Elf_Phdr *php; 1379 off_t offset; 1380 int i; 1381 1382 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1; 1383 offset = round_page(hdrsize + notesz); 1384 for (i = 0; i < seginfo.count; i++) { 1385 error = core_output((caddr_t)(uintptr_t)php->p_vaddr, 1386 php->p_filesz, offset, ¶ms, tmpbuf); 1387 if (error != 0) 1388 break; 1389 offset += php->p_filesz; 1390 php++; 1391 } 1392 #ifdef GZIO 1393 if (error == 0 && compress) 1394 error = gzio_flush(params.gzs); 1395 #endif 1396 } 1397 if (error) { 1398 log(LOG_WARNING, 1399 "Failed to write core file for process %s (error %d)\n", 1400 curproc->p_comm, error); 1401 } 1402 1403 done: 1404 #ifdef GZIO 1405 if (compress) { 1406 free(tmpbuf, M_TEMP); 1407 if (params.gzs != NULL) 1408 gzio_fini(params.gzs); 1409 } 1410 #endif 1411 while ((ninfo = TAILQ_FIRST(¬elst)) != NULL) { 1412 TAILQ_REMOVE(¬elst, ninfo, link); 1413 free(ninfo, M_TEMP); 1414 } 1415 if (hdr != NULL) 1416 free(hdr, M_TEMP); 1417 1418 return (error); 1419 } 1420 1421 /* 1422 * A callback for each_writable_segment() to write out the segment's 1423 * program header entry. 1424 */ 1425 static void 1426 cb_put_phdr(entry, closure) 1427 vm_map_entry_t entry; 1428 void *closure; 1429 { 1430 struct phdr_closure *phc = (struct phdr_closure *)closure; 1431 Elf_Phdr *phdr = phc->phdr; 1432 1433 phc->offset = round_page(phc->offset); 1434 1435 phdr->p_type = PT_LOAD; 1436 phdr->p_offset = phc->offset; 1437 phdr->p_vaddr = entry->start; 1438 phdr->p_paddr = 0; 1439 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 1440 phdr->p_align = PAGE_SIZE; 1441 phdr->p_flags = __elfN(untrans_prot)(entry->protection); 1442 1443 phc->offset += phdr->p_filesz; 1444 phc->phdr++; 1445 } 1446 1447 /* 1448 * A callback for each_writable_segment() to gather information about 1449 * the number of segments and their total size. 1450 */ 1451 static void 1452 cb_size_segment(entry, closure) 1453 vm_map_entry_t entry; 1454 void *closure; 1455 { 1456 struct sseg_closure *ssc = (struct sseg_closure *)closure; 1457 1458 ssc->count++; 1459 ssc->size += entry->end - entry->start; 1460 } 1461 1462 /* 1463 * For each writable segment in the process's memory map, call the given 1464 * function with a pointer to the map entry and some arbitrary 1465 * caller-supplied data. 1466 */ 1467 static void 1468 each_writable_segment(td, func, closure) 1469 struct thread *td; 1470 segment_callback func; 1471 void *closure; 1472 { 1473 struct proc *p = td->td_proc; 1474 vm_map_t map = &p->p_vmspace->vm_map; 1475 vm_map_entry_t entry; 1476 vm_object_t backing_object, object; 1477 boolean_t ignore_entry; 1478 1479 vm_map_lock_read(map); 1480 for (entry = map->header.next; entry != &map->header; 1481 entry = entry->next) { 1482 /* 1483 * Don't dump inaccessible mappings, deal with legacy 1484 * coredump mode. 1485 * 1486 * Note that read-only segments related to the elf binary 1487 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer 1488 * need to arbitrarily ignore such segments. 1489 */ 1490 if (elf_legacy_coredump) { 1491 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW) 1492 continue; 1493 } else { 1494 if ((entry->protection & VM_PROT_ALL) == 0) 1495 continue; 1496 } 1497 1498 /* 1499 * Dont include memory segment in the coredump if 1500 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in 1501 * madvise(2). Do not dump submaps (i.e. parts of the 1502 * kernel map). 1503 */ 1504 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP)) 1505 continue; 1506 1507 if ((object = entry->object.vm_object) == NULL) 1508 continue; 1509 1510 /* Ignore memory-mapped devices and such things. */ 1511 VM_OBJECT_RLOCK(object); 1512 while ((backing_object = object->backing_object) != NULL) { 1513 VM_OBJECT_RLOCK(backing_object); 1514 VM_OBJECT_RUNLOCK(object); 1515 object = backing_object; 1516 } 1517 ignore_entry = object->type != OBJT_DEFAULT && 1518 object->type != OBJT_SWAP && object->type != OBJT_VNODE && 1519 object->type != OBJT_PHYS; 1520 VM_OBJECT_RUNLOCK(object); 1521 if (ignore_entry) 1522 continue; 1523 1524 (*func)(entry, closure); 1525 } 1526 vm_map_unlock_read(map); 1527 } 1528 1529 /* 1530 * Write the core file header to the file, including padding up to 1531 * the page boundary. 1532 */ 1533 static int 1534 __elfN(corehdr)(struct coredump_params *p, int numsegs, void *hdr, 1535 size_t hdrsize, struct note_info_list *notelst, size_t notesz) 1536 { 1537 struct note_info *ninfo; 1538 struct sbuf *sb; 1539 int error; 1540 1541 /* Fill in the header. */ 1542 bzero(hdr, hdrsize); 1543 __elfN(puthdr)(p->td, hdr, hdrsize, numsegs, notesz); 1544 1545 sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN); 1546 sbuf_set_drain(sb, sbuf_drain_core_output, p); 1547 sbuf_start_section(sb, NULL); 1548 sbuf_bcat(sb, hdr, hdrsize); 1549 TAILQ_FOREACH(ninfo, notelst, link) 1550 __elfN(putnote)(ninfo, sb); 1551 /* Align up to a page boundary for the program segments. */ 1552 sbuf_end_section(sb, -1, PAGE_SIZE, 0); 1553 error = sbuf_finish(sb); 1554 sbuf_delete(sb); 1555 1556 return (error); 1557 } 1558 1559 static void 1560 __elfN(prepare_notes)(struct thread *td, struct note_info_list *list, 1561 size_t *sizep) 1562 { 1563 struct proc *p; 1564 struct thread *thr; 1565 size_t size; 1566 1567 p = td->td_proc; 1568 size = 0; 1569 1570 size += register_note(list, NT_PRPSINFO, __elfN(note_prpsinfo), p); 1571 1572 /* 1573 * To have the debugger select the right thread (LWP) as the initial 1574 * thread, we dump the state of the thread passed to us in td first. 1575 * This is the thread that causes the core dump and thus likely to 1576 * be the right thread one wants to have selected in the debugger. 1577 */ 1578 thr = td; 1579 while (thr != NULL) { 1580 size += register_note(list, NT_PRSTATUS, 1581 __elfN(note_prstatus), thr); 1582 size += register_note(list, NT_FPREGSET, 1583 __elfN(note_fpregset), thr); 1584 size += register_note(list, NT_THRMISC, 1585 __elfN(note_thrmisc), thr); 1586 size += register_note(list, -1, 1587 __elfN(note_threadmd), thr); 1588 1589 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) : 1590 TAILQ_NEXT(thr, td_plist); 1591 if (thr == td) 1592 thr = TAILQ_NEXT(thr, td_plist); 1593 } 1594 1595 size += register_note(list, NT_PROCSTAT_PROC, 1596 __elfN(note_procstat_proc), p); 1597 size += register_note(list, NT_PROCSTAT_FILES, 1598 note_procstat_files, p); 1599 size += register_note(list, NT_PROCSTAT_VMMAP, 1600 note_procstat_vmmap, p); 1601 size += register_note(list, NT_PROCSTAT_GROUPS, 1602 note_procstat_groups, p); 1603 size += register_note(list, NT_PROCSTAT_UMASK, 1604 note_procstat_umask, p); 1605 size += register_note(list, NT_PROCSTAT_RLIMIT, 1606 note_procstat_rlimit, p); 1607 size += register_note(list, NT_PROCSTAT_OSREL, 1608 note_procstat_osrel, p); 1609 size += register_note(list, NT_PROCSTAT_PSSTRINGS, 1610 __elfN(note_procstat_psstrings), p); 1611 size += register_note(list, NT_PROCSTAT_AUXV, 1612 __elfN(note_procstat_auxv), p); 1613 1614 *sizep = size; 1615 } 1616 1617 static void 1618 __elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs, 1619 size_t notesz) 1620 { 1621 Elf_Ehdr *ehdr; 1622 Elf_Phdr *phdr; 1623 struct phdr_closure phc; 1624 1625 ehdr = (Elf_Ehdr *)hdr; 1626 phdr = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)); 1627 1628 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1629 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1630 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1631 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1632 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 1633 ehdr->e_ident[EI_DATA] = ELF_DATA; 1634 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 1635 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 1636 ehdr->e_ident[EI_ABIVERSION] = 0; 1637 ehdr->e_ident[EI_PAD] = 0; 1638 ehdr->e_type = ET_CORE; 1639 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1640 ehdr->e_machine = ELF_ARCH32; 1641 #else 1642 ehdr->e_machine = ELF_ARCH; 1643 #endif 1644 ehdr->e_version = EV_CURRENT; 1645 ehdr->e_entry = 0; 1646 ehdr->e_phoff = sizeof(Elf_Ehdr); 1647 ehdr->e_flags = 0; 1648 ehdr->e_ehsize = sizeof(Elf_Ehdr); 1649 ehdr->e_phentsize = sizeof(Elf_Phdr); 1650 ehdr->e_phnum = numsegs + 1; 1651 ehdr->e_shentsize = sizeof(Elf_Shdr); 1652 ehdr->e_shnum = 0; 1653 ehdr->e_shstrndx = SHN_UNDEF; 1654 1655 /* 1656 * Fill in the program header entries. 1657 */ 1658 1659 /* The note segement. */ 1660 phdr->p_type = PT_NOTE; 1661 phdr->p_offset = hdrsize; 1662 phdr->p_vaddr = 0; 1663 phdr->p_paddr = 0; 1664 phdr->p_filesz = notesz; 1665 phdr->p_memsz = 0; 1666 phdr->p_flags = PF_R; 1667 phdr->p_align = ELF_NOTE_ROUNDSIZE; 1668 phdr++; 1669 1670 /* All the writable segments from the program. */ 1671 phc.phdr = phdr; 1672 phc.offset = round_page(hdrsize + notesz); 1673 each_writable_segment(td, cb_put_phdr, &phc); 1674 } 1675 1676 static size_t 1677 register_note(struct note_info_list *list, int type, outfunc_t out, void *arg) 1678 { 1679 struct note_info *ninfo; 1680 size_t size, notesize; 1681 1682 size = 0; 1683 out(arg, NULL, &size); 1684 ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK); 1685 ninfo->type = type; 1686 ninfo->outfunc = out; 1687 ninfo->outarg = arg; 1688 ninfo->outsize = size; 1689 TAILQ_INSERT_TAIL(list, ninfo, link); 1690 1691 if (type == -1) 1692 return (size); 1693 1694 notesize = sizeof(Elf_Note) + /* note header */ 1695 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + 1696 /* note name */ 1697 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 1698 1699 return (notesize); 1700 } 1701 1702 static size_t 1703 append_note_data(const void *src, void *dst, size_t len) 1704 { 1705 size_t padded_len; 1706 1707 padded_len = roundup2(len, ELF_NOTE_ROUNDSIZE); 1708 if (dst != NULL) { 1709 bcopy(src, dst, len); 1710 bzero((char *)dst + len, padded_len - len); 1711 } 1712 return (padded_len); 1713 } 1714 1715 size_t 1716 __elfN(populate_note)(int type, void *src, void *dst, size_t size, void **descp) 1717 { 1718 Elf_Note *note; 1719 char *buf; 1720 size_t notesize; 1721 1722 buf = dst; 1723 if (buf != NULL) { 1724 note = (Elf_Note *)buf; 1725 note->n_namesz = sizeof(FREEBSD_ABI_VENDOR); 1726 note->n_descsz = size; 1727 note->n_type = type; 1728 buf += sizeof(*note); 1729 buf += append_note_data(FREEBSD_ABI_VENDOR, buf, 1730 sizeof(FREEBSD_ABI_VENDOR)); 1731 append_note_data(src, buf, size); 1732 if (descp != NULL) 1733 *descp = buf; 1734 } 1735 1736 notesize = sizeof(Elf_Note) + /* note header */ 1737 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + 1738 /* note name */ 1739 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 1740 1741 return (notesize); 1742 } 1743 1744 static void 1745 __elfN(putnote)(struct note_info *ninfo, struct sbuf *sb) 1746 { 1747 Elf_Note note; 1748 ssize_t old_len, sect_len; 1749 size_t new_len, descsz, i; 1750 1751 if (ninfo->type == -1) { 1752 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 1753 return; 1754 } 1755 1756 note.n_namesz = sizeof(FREEBSD_ABI_VENDOR); 1757 note.n_descsz = ninfo->outsize; 1758 note.n_type = ninfo->type; 1759 1760 sbuf_bcat(sb, ¬e, sizeof(note)); 1761 sbuf_start_section(sb, &old_len); 1762 sbuf_bcat(sb, FREEBSD_ABI_VENDOR, sizeof(FREEBSD_ABI_VENDOR)); 1763 sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 1764 if (note.n_descsz == 0) 1765 return; 1766 sbuf_start_section(sb, &old_len); 1767 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 1768 sect_len = sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 1769 if (sect_len < 0) 1770 return; 1771 1772 new_len = (size_t)sect_len; 1773 descsz = roundup(note.n_descsz, ELF_NOTE_ROUNDSIZE); 1774 if (new_len < descsz) { 1775 /* 1776 * It is expected that individual note emitters will correctly 1777 * predict their expected output size and fill up to that size 1778 * themselves, padding in a format-specific way if needed. 1779 * However, in case they don't, just do it here with zeros. 1780 */ 1781 for (i = 0; i < descsz - new_len; i++) 1782 sbuf_putc(sb, 0); 1783 } else if (new_len > descsz) { 1784 /* 1785 * We can't always truncate sb -- we may have drained some 1786 * of it already. 1787 */ 1788 KASSERT(new_len == descsz, ("%s: Note type %u changed as we " 1789 "read it (%zu > %zu). Since it is longer than " 1790 "expected, this coredump's notes are corrupt. THIS " 1791 "IS A BUG in the note_procstat routine for type %u.\n", 1792 __func__, (unsigned)note.n_type, new_len, descsz, 1793 (unsigned)note.n_type)); 1794 } 1795 } 1796 1797 /* 1798 * Miscellaneous note out functions. 1799 */ 1800 1801 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1802 #include <compat/freebsd32/freebsd32.h> 1803 1804 typedef struct prstatus32 elf_prstatus_t; 1805 typedef struct prpsinfo32 elf_prpsinfo_t; 1806 typedef struct fpreg32 elf_prfpregset_t; 1807 typedef struct fpreg32 elf_fpregset_t; 1808 typedef struct reg32 elf_gregset_t; 1809 typedef struct thrmisc32 elf_thrmisc_t; 1810 #define ELF_KERN_PROC_MASK KERN_PROC_MASK32 1811 typedef struct kinfo_proc32 elf_kinfo_proc_t; 1812 typedef uint32_t elf_ps_strings_t; 1813 #else 1814 typedef prstatus_t elf_prstatus_t; 1815 typedef prpsinfo_t elf_prpsinfo_t; 1816 typedef prfpregset_t elf_prfpregset_t; 1817 typedef prfpregset_t elf_fpregset_t; 1818 typedef gregset_t elf_gregset_t; 1819 typedef thrmisc_t elf_thrmisc_t; 1820 #define ELF_KERN_PROC_MASK 0 1821 typedef struct kinfo_proc elf_kinfo_proc_t; 1822 typedef vm_offset_t elf_ps_strings_t; 1823 #endif 1824 1825 static void 1826 __elfN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep) 1827 { 1828 struct proc *p; 1829 elf_prpsinfo_t *psinfo; 1830 1831 p = (struct proc *)arg; 1832 if (sb != NULL) { 1833 KASSERT(*sizep == sizeof(*psinfo), ("invalid size")); 1834 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK); 1835 psinfo->pr_version = PRPSINFO_VERSION; 1836 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t); 1837 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname)); 1838 /* 1839 * XXX - We don't fill in the command line arguments properly 1840 * yet. 1841 */ 1842 strlcpy(psinfo->pr_psargs, p->p_comm, 1843 sizeof(psinfo->pr_psargs)); 1844 1845 sbuf_bcat(sb, psinfo, sizeof(*psinfo)); 1846 free(psinfo, M_TEMP); 1847 } 1848 *sizep = sizeof(*psinfo); 1849 } 1850 1851 static void 1852 __elfN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep) 1853 { 1854 struct thread *td; 1855 elf_prstatus_t *status; 1856 1857 td = (struct thread *)arg; 1858 if (sb != NULL) { 1859 KASSERT(*sizep == sizeof(*status), ("invalid size")); 1860 status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK); 1861 status->pr_version = PRSTATUS_VERSION; 1862 status->pr_statussz = sizeof(elf_prstatus_t); 1863 status->pr_gregsetsz = sizeof(elf_gregset_t); 1864 status->pr_fpregsetsz = sizeof(elf_fpregset_t); 1865 status->pr_osreldate = osreldate; 1866 status->pr_cursig = td->td_proc->p_sig; 1867 status->pr_pid = td->td_tid; 1868 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1869 fill_regs32(td, &status->pr_reg); 1870 #else 1871 fill_regs(td, &status->pr_reg); 1872 #endif 1873 sbuf_bcat(sb, status, sizeof(*status)); 1874 free(status, M_TEMP); 1875 } 1876 *sizep = sizeof(*status); 1877 } 1878 1879 static void 1880 __elfN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep) 1881 { 1882 struct thread *td; 1883 elf_prfpregset_t *fpregset; 1884 1885 td = (struct thread *)arg; 1886 if (sb != NULL) { 1887 KASSERT(*sizep == sizeof(*fpregset), ("invalid size")); 1888 fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK); 1889 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1890 fill_fpregs32(td, fpregset); 1891 #else 1892 fill_fpregs(td, fpregset); 1893 #endif 1894 sbuf_bcat(sb, fpregset, sizeof(*fpregset)); 1895 free(fpregset, M_TEMP); 1896 } 1897 *sizep = sizeof(*fpregset); 1898 } 1899 1900 static void 1901 __elfN(note_thrmisc)(void *arg, struct sbuf *sb, size_t *sizep) 1902 { 1903 struct thread *td; 1904 elf_thrmisc_t thrmisc; 1905 1906 td = (struct thread *)arg; 1907 if (sb != NULL) { 1908 KASSERT(*sizep == sizeof(thrmisc), ("invalid size")); 1909 bzero(&thrmisc._pad, sizeof(thrmisc._pad)); 1910 strcpy(thrmisc.pr_tname, td->td_name); 1911 sbuf_bcat(sb, &thrmisc, sizeof(thrmisc)); 1912 } 1913 *sizep = sizeof(thrmisc); 1914 } 1915 1916 /* 1917 * Allow for MD specific notes, as well as any MD 1918 * specific preparations for writing MI notes. 1919 */ 1920 static void 1921 __elfN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep) 1922 { 1923 struct thread *td; 1924 void *buf; 1925 size_t size; 1926 1927 td = (struct thread *)arg; 1928 size = *sizep; 1929 if (size != 0 && sb != NULL) 1930 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK); 1931 else 1932 buf = NULL; 1933 size = 0; 1934 __elfN(dump_thread)(td, buf, &size); 1935 KASSERT(sb == NULL || *sizep == size, ("invalid size")); 1936 if (size != 0 && sb != NULL) 1937 sbuf_bcat(sb, buf, size); 1938 free(buf, M_TEMP); 1939 *sizep = size; 1940 } 1941 1942 #ifdef KINFO_PROC_SIZE 1943 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE); 1944 #endif 1945 1946 static void 1947 __elfN(note_procstat_proc)(void *arg, struct sbuf *sb, size_t *sizep) 1948 { 1949 struct proc *p; 1950 size_t size; 1951 int structsize; 1952 1953 p = (struct proc *)arg; 1954 size = sizeof(structsize) + p->p_numthreads * 1955 sizeof(elf_kinfo_proc_t); 1956 1957 if (sb != NULL) { 1958 KASSERT(*sizep == size, ("invalid size")); 1959 structsize = sizeof(elf_kinfo_proc_t); 1960 sbuf_bcat(sb, &structsize, sizeof(structsize)); 1961 sx_slock(&proctree_lock); 1962 PROC_LOCK(p); 1963 kern_proc_out(p, sb, ELF_KERN_PROC_MASK); 1964 sx_sunlock(&proctree_lock); 1965 } 1966 *sizep = size; 1967 } 1968 1969 #ifdef KINFO_FILE_SIZE 1970 CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE); 1971 #endif 1972 1973 static void 1974 note_procstat_files(void *arg, struct sbuf *sb, size_t *sizep) 1975 { 1976 struct proc *p; 1977 size_t size, sect_sz, i; 1978 ssize_t start_len, sect_len; 1979 int structsize, filedesc_flags; 1980 1981 if (coredump_pack_fileinfo) 1982 filedesc_flags = KERN_FILEDESC_PACK_KINFO; 1983 else 1984 filedesc_flags = 0; 1985 1986 p = (struct proc *)arg; 1987 structsize = sizeof(struct kinfo_file); 1988 if (sb == NULL) { 1989 size = 0; 1990 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 1991 sbuf_set_drain(sb, sbuf_drain_count, &size); 1992 sbuf_bcat(sb, &structsize, sizeof(structsize)); 1993 PROC_LOCK(p); 1994 kern_proc_filedesc_out(p, sb, -1, filedesc_flags); 1995 sbuf_finish(sb); 1996 sbuf_delete(sb); 1997 *sizep = size; 1998 } else { 1999 sbuf_start_section(sb, &start_len); 2000 2001 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2002 PROC_LOCK(p); 2003 kern_proc_filedesc_out(p, sb, *sizep - sizeof(structsize), 2004 filedesc_flags); 2005 2006 sect_len = sbuf_end_section(sb, start_len, 0, 0); 2007 if (sect_len < 0) 2008 return; 2009 sect_sz = sect_len; 2010 2011 KASSERT(sect_sz <= *sizep, 2012 ("kern_proc_filedesc_out did not respect maxlen; " 2013 "requested %zu, got %zu", *sizep - sizeof(structsize), 2014 sect_sz - sizeof(structsize))); 2015 2016 for (i = 0; i < *sizep - sect_sz && sb->s_error == 0; i++) 2017 sbuf_putc(sb, 0); 2018 } 2019 } 2020 2021 #ifdef KINFO_VMENTRY_SIZE 2022 CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE); 2023 #endif 2024 2025 static void 2026 note_procstat_vmmap(void *arg, struct sbuf *sb, size_t *sizep) 2027 { 2028 struct proc *p; 2029 size_t size; 2030 int structsize, vmmap_flags; 2031 2032 if (coredump_pack_vmmapinfo) 2033 vmmap_flags = KERN_VMMAP_PACK_KINFO; 2034 else 2035 vmmap_flags = 0; 2036 2037 p = (struct proc *)arg; 2038 structsize = sizeof(struct kinfo_vmentry); 2039 if (sb == NULL) { 2040 size = 0; 2041 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2042 sbuf_set_drain(sb, sbuf_drain_count, &size); 2043 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2044 PROC_LOCK(p); 2045 kern_proc_vmmap_out(p, sb, -1, vmmap_flags); 2046 sbuf_finish(sb); 2047 sbuf_delete(sb); 2048 *sizep = size; 2049 } else { 2050 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2051 PROC_LOCK(p); 2052 kern_proc_vmmap_out(p, sb, *sizep - sizeof(structsize), 2053 vmmap_flags); 2054 } 2055 } 2056 2057 static void 2058 note_procstat_groups(void *arg, struct sbuf *sb, size_t *sizep) 2059 { 2060 struct proc *p; 2061 size_t size; 2062 int structsize; 2063 2064 p = (struct proc *)arg; 2065 size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t); 2066 if (sb != NULL) { 2067 KASSERT(*sizep == size, ("invalid size")); 2068 structsize = sizeof(gid_t); 2069 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2070 sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups * 2071 sizeof(gid_t)); 2072 } 2073 *sizep = size; 2074 } 2075 2076 static void 2077 note_procstat_umask(void *arg, struct sbuf *sb, size_t *sizep) 2078 { 2079 struct proc *p; 2080 size_t size; 2081 int structsize; 2082 2083 p = (struct proc *)arg; 2084 size = sizeof(structsize) + sizeof(p->p_fd->fd_cmask); 2085 if (sb != NULL) { 2086 KASSERT(*sizep == size, ("invalid size")); 2087 structsize = sizeof(p->p_fd->fd_cmask); 2088 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2089 sbuf_bcat(sb, &p->p_fd->fd_cmask, sizeof(p->p_fd->fd_cmask)); 2090 } 2091 *sizep = size; 2092 } 2093 2094 static void 2095 note_procstat_rlimit(void *arg, struct sbuf *sb, size_t *sizep) 2096 { 2097 struct proc *p; 2098 struct rlimit rlim[RLIM_NLIMITS]; 2099 size_t size; 2100 int structsize, i; 2101 2102 p = (struct proc *)arg; 2103 size = sizeof(structsize) + sizeof(rlim); 2104 if (sb != NULL) { 2105 KASSERT(*sizep == size, ("invalid size")); 2106 structsize = sizeof(rlim); 2107 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2108 PROC_LOCK(p); 2109 for (i = 0; i < RLIM_NLIMITS; i++) 2110 lim_rlimit_proc(p, i, &rlim[i]); 2111 PROC_UNLOCK(p); 2112 sbuf_bcat(sb, rlim, sizeof(rlim)); 2113 } 2114 *sizep = size; 2115 } 2116 2117 static void 2118 note_procstat_osrel(void *arg, struct sbuf *sb, size_t *sizep) 2119 { 2120 struct proc *p; 2121 size_t size; 2122 int structsize; 2123 2124 p = (struct proc *)arg; 2125 size = sizeof(structsize) + sizeof(p->p_osrel); 2126 if (sb != NULL) { 2127 KASSERT(*sizep == size, ("invalid size")); 2128 structsize = sizeof(p->p_osrel); 2129 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2130 sbuf_bcat(sb, &p->p_osrel, sizeof(p->p_osrel)); 2131 } 2132 *sizep = size; 2133 } 2134 2135 static void 2136 __elfN(note_procstat_psstrings)(void *arg, struct sbuf *sb, size_t *sizep) 2137 { 2138 struct proc *p; 2139 elf_ps_strings_t ps_strings; 2140 size_t size; 2141 int structsize; 2142 2143 p = (struct proc *)arg; 2144 size = sizeof(structsize) + sizeof(ps_strings); 2145 if (sb != NULL) { 2146 KASSERT(*sizep == size, ("invalid size")); 2147 structsize = sizeof(ps_strings); 2148 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2149 ps_strings = PTROUT(p->p_sysent->sv_psstrings); 2150 #else 2151 ps_strings = p->p_sysent->sv_psstrings; 2152 #endif 2153 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2154 sbuf_bcat(sb, &ps_strings, sizeof(ps_strings)); 2155 } 2156 *sizep = size; 2157 } 2158 2159 static void 2160 __elfN(note_procstat_auxv)(void *arg, struct sbuf *sb, size_t *sizep) 2161 { 2162 struct proc *p; 2163 size_t size; 2164 int structsize; 2165 2166 p = (struct proc *)arg; 2167 if (sb == NULL) { 2168 size = 0; 2169 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2170 sbuf_set_drain(sb, sbuf_drain_count, &size); 2171 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2172 PHOLD(p); 2173 proc_getauxv(curthread, p, sb); 2174 PRELE(p); 2175 sbuf_finish(sb); 2176 sbuf_delete(sb); 2177 *sizep = size; 2178 } else { 2179 structsize = sizeof(Elf_Auxinfo); 2180 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2181 PHOLD(p); 2182 proc_getauxv(curthread, p, sb); 2183 PRELE(p); 2184 } 2185 } 2186 2187 static boolean_t 2188 __elfN(parse_notes)(struct image_params *imgp, Elf_Brandnote *checknote, 2189 int32_t *osrel, const Elf_Phdr *pnote) 2190 { 2191 const Elf_Note *note, *note0, *note_end; 2192 const char *note_name; 2193 char *buf; 2194 int i, error; 2195 boolean_t res; 2196 2197 /* We need some limit, might as well use PAGE_SIZE. */ 2198 if (pnote == NULL || pnote->p_filesz > PAGE_SIZE) 2199 return (FALSE); 2200 ASSERT_VOP_LOCKED(imgp->vp, "parse_notes"); 2201 if (pnote->p_offset > PAGE_SIZE || 2202 pnote->p_filesz > PAGE_SIZE - pnote->p_offset) { 2203 VOP_UNLOCK(imgp->vp, 0); 2204 buf = malloc(pnote->p_filesz, M_TEMP, M_WAITOK); 2205 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 2206 error = vn_rdwr(UIO_READ, imgp->vp, buf, pnote->p_filesz, 2207 pnote->p_offset, UIO_SYSSPACE, IO_NODELOCKED, 2208 curthread->td_ucred, NOCRED, NULL, curthread); 2209 if (error != 0) { 2210 uprintf("i/o error PT_NOTE\n"); 2211 res = FALSE; 2212 goto ret; 2213 } 2214 note = note0 = (const Elf_Note *)buf; 2215 note_end = (const Elf_Note *)(buf + pnote->p_filesz); 2216 } else { 2217 note = note0 = (const Elf_Note *)(imgp->image_header + 2218 pnote->p_offset); 2219 note_end = (const Elf_Note *)(imgp->image_header + 2220 pnote->p_offset + pnote->p_filesz); 2221 buf = NULL; 2222 } 2223 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) { 2224 if (!aligned(note, Elf32_Addr) || (const char *)note_end - 2225 (const char *)note < sizeof(Elf_Note)) { 2226 res = FALSE; 2227 goto ret; 2228 } 2229 if (note->n_namesz != checknote->hdr.n_namesz || 2230 note->n_descsz != checknote->hdr.n_descsz || 2231 note->n_type != checknote->hdr.n_type) 2232 goto nextnote; 2233 note_name = (const char *)(note + 1); 2234 if (note_name + checknote->hdr.n_namesz >= 2235 (const char *)note_end || strncmp(checknote->vendor, 2236 note_name, checknote->hdr.n_namesz) != 0) 2237 goto nextnote; 2238 2239 /* 2240 * Fetch the osreldate for binary 2241 * from the ELF OSABI-note if necessary. 2242 */ 2243 if ((checknote->flags & BN_TRANSLATE_OSREL) != 0 && 2244 checknote->trans_osrel != NULL) { 2245 res = checknote->trans_osrel(note, osrel); 2246 goto ret; 2247 } 2248 res = TRUE; 2249 goto ret; 2250 nextnote: 2251 note = (const Elf_Note *)((const char *)(note + 1) + 2252 roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) + 2253 roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE)); 2254 } 2255 res = FALSE; 2256 ret: 2257 free(buf, M_TEMP); 2258 return (res); 2259 } 2260 2261 /* 2262 * Try to find the appropriate ABI-note section for checknote, 2263 * fetch the osreldate for binary from the ELF OSABI-note. Only the 2264 * first page of the image is searched, the same as for headers. 2265 */ 2266 static boolean_t 2267 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote, 2268 int32_t *osrel) 2269 { 2270 const Elf_Phdr *phdr; 2271 const Elf_Ehdr *hdr; 2272 int i; 2273 2274 hdr = (const Elf_Ehdr *)imgp->image_header; 2275 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 2276 2277 for (i = 0; i < hdr->e_phnum; i++) { 2278 if (phdr[i].p_type == PT_NOTE && 2279 __elfN(parse_notes)(imgp, checknote, osrel, &phdr[i])) 2280 return (TRUE); 2281 } 2282 return (FALSE); 2283 2284 } 2285 2286 /* 2287 * Tell kern_execve.c about it, with a little help from the linker. 2288 */ 2289 static struct execsw __elfN(execsw) = { 2290 __CONCAT(exec_, __elfN(imgact)), 2291 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) 2292 }; 2293 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw)); 2294 2295 static vm_prot_t 2296 __elfN(trans_prot)(Elf_Word flags) 2297 { 2298 vm_prot_t prot; 2299 2300 prot = 0; 2301 if (flags & PF_X) 2302 prot |= VM_PROT_EXECUTE; 2303 if (flags & PF_W) 2304 prot |= VM_PROT_WRITE; 2305 if (flags & PF_R) 2306 prot |= VM_PROT_READ; 2307 #if __ELF_WORD_SIZE == 32 2308 #if defined(__amd64__) 2309 if (i386_read_exec && (flags & PF_R)) 2310 prot |= VM_PROT_EXECUTE; 2311 #endif 2312 #endif 2313 return (prot); 2314 } 2315 2316 static Elf_Word 2317 __elfN(untrans_prot)(vm_prot_t prot) 2318 { 2319 Elf_Word flags; 2320 2321 flags = 0; 2322 if (prot & VM_PROT_EXECUTE) 2323 flags |= PF_X; 2324 if (prot & VM_PROT_READ) 2325 flags |= PF_R; 2326 if (prot & VM_PROT_WRITE) 2327 flags |= PF_W; 2328 return (flags); 2329 } 2330