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 84 #define ELF_NOTE_ROUNDSIZE 4 85 #define OLD_EI_BRAND 8 86 87 static int __elfN(check_header)(const Elf_Ehdr *hdr); 88 static Elf_Brandinfo *__elfN(get_brandinfo)(struct image_params *imgp, 89 const char *interp, int interp_name_len, int32_t *osrel); 90 static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 91 u_long *entry, size_t pagesize); 92 static int __elfN(load_section)(struct image_params *imgp, vm_offset_t offset, 93 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot, 94 size_t pagesize); 95 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp); 96 static boolean_t __elfN(freebsd_trans_osrel)(const Elf_Note *note, 97 int32_t *osrel); 98 static boolean_t kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel); 99 static boolean_t __elfN(check_note)(struct image_params *imgp, 100 Elf_Brandnote *checknote, int32_t *osrel); 101 static vm_prot_t __elfN(trans_prot)(Elf_Word); 102 static Elf_Word __elfN(untrans_prot)(vm_prot_t); 103 104 SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0, 105 ""); 106 107 #define CORE_BUF_SIZE (16 * 1024) 108 109 int __elfN(fallback_brand) = -1; 110 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, 111 fallback_brand, CTLFLAG_RWTUN, &__elfN(fallback_brand), 0, 112 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort"); 113 114 static int elf_legacy_coredump = 0; 115 SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW, 116 &elf_legacy_coredump, 0, 117 "include all and only RW pages in core dumps"); 118 119 int __elfN(nxstack) = 120 #if defined(__amd64__) || defined(__powerpc64__) /* both 64 and 32 bit */ || \ 121 (defined(__arm__) && __ARM_ARCH >= 7) || defined(__aarch64__) 122 1; 123 #else 124 0; 125 #endif 126 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, 127 nxstack, CTLFLAG_RW, &__elfN(nxstack), 0, 128 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable non-executable stack"); 129 130 #if __ELF_WORD_SIZE == 32 131 #if defined(__amd64__) 132 int i386_read_exec = 0; 133 SYSCTL_INT(_kern_elf32, OID_AUTO, read_exec, CTLFLAG_RW, &i386_read_exec, 0, 134 "enable execution from readable segments"); 135 #endif 136 #endif 137 138 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS]; 139 140 #define trunc_page_ps(va, ps) rounddown2(va, ps) 141 #define round_page_ps(va, ps) roundup2(va, ps) 142 #define aligned(a, t) (trunc_page_ps((u_long)(a), sizeof(t)) == (u_long)(a)) 143 144 static const char FREEBSD_ABI_VENDOR[] = "FreeBSD"; 145 146 Elf_Brandnote __elfN(freebsd_brandnote) = { 147 .hdr.n_namesz = sizeof(FREEBSD_ABI_VENDOR), 148 .hdr.n_descsz = sizeof(int32_t), 149 .hdr.n_type = NT_FREEBSD_ABI_TAG, 150 .vendor = FREEBSD_ABI_VENDOR, 151 .flags = BN_TRANSLATE_OSREL, 152 .trans_osrel = __elfN(freebsd_trans_osrel) 153 }; 154 155 static boolean_t 156 __elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel) 157 { 158 uintptr_t p; 159 160 p = (uintptr_t)(note + 1); 161 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE); 162 *osrel = *(const int32_t *)(p); 163 164 return (TRUE); 165 } 166 167 static const char GNU_ABI_VENDOR[] = "GNU"; 168 static int GNU_KFREEBSD_ABI_DESC = 3; 169 170 Elf_Brandnote __elfN(kfreebsd_brandnote) = { 171 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 172 .hdr.n_descsz = 16, /* XXX at least 16 */ 173 .hdr.n_type = 1, 174 .vendor = GNU_ABI_VENDOR, 175 .flags = BN_TRANSLATE_OSREL, 176 .trans_osrel = kfreebsd_trans_osrel 177 }; 178 179 static boolean_t 180 kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel) 181 { 182 const Elf32_Word *desc; 183 uintptr_t p; 184 185 p = (uintptr_t)(note + 1); 186 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE); 187 188 desc = (const Elf32_Word *)p; 189 if (desc[0] != GNU_KFREEBSD_ABI_DESC) 190 return (FALSE); 191 192 /* 193 * Debian GNU/kFreeBSD embed the earliest compatible kernel version 194 * (__FreeBSD_version: <major><two digit minor>Rxx) in the LSB way. 195 */ 196 *osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3]; 197 198 return (TRUE); 199 } 200 201 int 202 __elfN(insert_brand_entry)(Elf_Brandinfo *entry) 203 { 204 int i; 205 206 for (i = 0; i < MAX_BRANDS; i++) { 207 if (elf_brand_list[i] == NULL) { 208 elf_brand_list[i] = entry; 209 break; 210 } 211 } 212 if (i == MAX_BRANDS) { 213 printf("WARNING: %s: could not insert brandinfo entry: %p\n", 214 __func__, entry); 215 return (-1); 216 } 217 return (0); 218 } 219 220 int 221 __elfN(remove_brand_entry)(Elf_Brandinfo *entry) 222 { 223 int i; 224 225 for (i = 0; i < MAX_BRANDS; i++) { 226 if (elf_brand_list[i] == entry) { 227 elf_brand_list[i] = NULL; 228 break; 229 } 230 } 231 if (i == MAX_BRANDS) 232 return (-1); 233 return (0); 234 } 235 236 int 237 __elfN(brand_inuse)(Elf_Brandinfo *entry) 238 { 239 struct proc *p; 240 int rval = FALSE; 241 242 sx_slock(&allproc_lock); 243 FOREACH_PROC_IN_SYSTEM(p) { 244 if (p->p_sysent == entry->sysvec) { 245 rval = TRUE; 246 break; 247 } 248 } 249 sx_sunlock(&allproc_lock); 250 251 return (rval); 252 } 253 254 static Elf_Brandinfo * 255 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp, 256 int interp_name_len, int32_t *osrel) 257 { 258 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header; 259 Elf_Brandinfo *bi, *bi_m; 260 boolean_t ret; 261 int i; 262 263 /* 264 * We support four types of branding -- (1) the ELF EI_OSABI field 265 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string 266 * branding w/in the ELF header, (3) path of the `interp_path' 267 * field, and (4) the ".note.ABI-tag" ELF section. 268 */ 269 270 /* Look for an ".note.ABI-tag" ELF section */ 271 bi_m = NULL; 272 for (i = 0; i < MAX_BRANDS; i++) { 273 bi = elf_brand_list[i]; 274 if (bi == NULL) 275 continue; 276 if (hdr->e_machine == bi->machine && (bi->flags & 277 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) { 278 ret = __elfN(check_note)(imgp, bi->brand_note, osrel); 279 /* Give brand a chance to veto check_note's guess */ 280 if (ret && bi->header_supported) 281 ret = bi->header_supported(imgp); 282 /* 283 * If note checker claimed the binary, but the 284 * interpreter path in the image does not 285 * match default one for the brand, try to 286 * search for other brands with the same 287 * interpreter. Either there is better brand 288 * with the right interpreter, or, failing 289 * this, we return first brand which accepted 290 * our note and, optionally, header. 291 */ 292 if (ret && bi_m == NULL && (strlen(bi->interp_path) + 293 1 != interp_name_len || strncmp(interp, 294 bi->interp_path, interp_name_len) != 0)) { 295 bi_m = bi; 296 ret = 0; 297 } 298 if (ret) 299 return (bi); 300 } 301 } 302 if (bi_m != NULL) 303 return (bi_m); 304 305 /* If the executable has a brand, search for it in the brand list. */ 306 for (i = 0; i < MAX_BRANDS; i++) { 307 bi = elf_brand_list[i]; 308 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY) 309 continue; 310 if (hdr->e_machine == bi->machine && 311 (hdr->e_ident[EI_OSABI] == bi->brand || 312 strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND], 313 bi->compat_3_brand, strlen(bi->compat_3_brand)) == 0)) { 314 /* Looks good, but give brand a chance to veto */ 315 if (!bi->header_supported || bi->header_supported(imgp)) 316 return (bi); 317 } 318 } 319 320 /* No known brand, see if the header is recognized by any brand */ 321 for (i = 0; i < MAX_BRANDS; i++) { 322 bi = elf_brand_list[i]; 323 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY || 324 bi->header_supported == NULL) 325 continue; 326 if (hdr->e_machine == bi->machine) { 327 ret = bi->header_supported(imgp); 328 if (ret) 329 return (bi); 330 } 331 } 332 333 /* Lacking a known brand, search for a recognized interpreter. */ 334 if (interp != NULL) { 335 for (i = 0; i < MAX_BRANDS; i++) { 336 bi = elf_brand_list[i]; 337 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY) 338 continue; 339 if (hdr->e_machine == bi->machine && 340 /* ELF image p_filesz includes terminating zero */ 341 strlen(bi->interp_path) + 1 == interp_name_len && 342 strncmp(interp, bi->interp_path, interp_name_len) 343 == 0) 344 return (bi); 345 } 346 } 347 348 /* Lacking a recognized interpreter, try the default brand */ 349 for (i = 0; i < MAX_BRANDS; i++) { 350 bi = elf_brand_list[i]; 351 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY) 352 continue; 353 if (hdr->e_machine == bi->machine && 354 __elfN(fallback_brand) == bi->brand) 355 return (bi); 356 } 357 return (NULL); 358 } 359 360 static int 361 __elfN(check_header)(const Elf_Ehdr *hdr) 362 { 363 Elf_Brandinfo *bi; 364 int i; 365 366 if (!IS_ELF(*hdr) || 367 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 368 hdr->e_ident[EI_DATA] != ELF_TARG_DATA || 369 hdr->e_ident[EI_VERSION] != EV_CURRENT || 370 hdr->e_phentsize != sizeof(Elf_Phdr) || 371 hdr->e_version != ELF_TARG_VER) 372 return (ENOEXEC); 373 374 /* 375 * Make sure we have at least one brand for this machine. 376 */ 377 378 for (i = 0; i < MAX_BRANDS; i++) { 379 bi = elf_brand_list[i]; 380 if (bi != NULL && bi->machine == hdr->e_machine) 381 break; 382 } 383 if (i == MAX_BRANDS) 384 return (ENOEXEC); 385 386 return (0); 387 } 388 389 static int 390 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 391 vm_offset_t start, vm_offset_t end, vm_prot_t prot) 392 { 393 struct sf_buf *sf; 394 int error; 395 vm_offset_t off; 396 397 /* 398 * Create the page if it doesn't exist yet. Ignore errors. 399 */ 400 vm_map_lock(map); 401 vm_map_insert(map, NULL, 0, trunc_page(start), round_page(end), 402 VM_PROT_ALL, VM_PROT_ALL, 0); 403 vm_map_unlock(map); 404 405 /* 406 * Find the page from the underlying object. 407 */ 408 if (object) { 409 sf = vm_imgact_map_page(object, offset); 410 if (sf == NULL) 411 return (KERN_FAILURE); 412 off = offset - trunc_page(offset); 413 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start, 414 end - start); 415 vm_imgact_unmap_page(sf); 416 if (error) { 417 return (KERN_FAILURE); 418 } 419 } 420 421 return (KERN_SUCCESS); 422 } 423 424 static int 425 __elfN(map_insert)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 426 vm_offset_t start, vm_offset_t end, vm_prot_t prot, int cow) 427 { 428 struct sf_buf *sf; 429 vm_offset_t off; 430 vm_size_t sz; 431 int error, rv; 432 433 if (start != trunc_page(start)) { 434 rv = __elfN(map_partial)(map, object, offset, start, 435 round_page(start), prot); 436 if (rv) 437 return (rv); 438 offset += round_page(start) - start; 439 start = round_page(start); 440 } 441 if (end != round_page(end)) { 442 rv = __elfN(map_partial)(map, object, offset + 443 trunc_page(end) - start, trunc_page(end), end, prot); 444 if (rv) 445 return (rv); 446 end = trunc_page(end); 447 } 448 if (end > start) { 449 if (offset & PAGE_MASK) { 450 /* 451 * The mapping is not page aligned. This means we have 452 * to copy the data. Sigh. 453 */ 454 rv = vm_map_find(map, NULL, 0, &start, end - start, 0, 455 VMFS_NO_SPACE, prot | VM_PROT_WRITE, VM_PROT_ALL, 456 0); 457 if (rv != KERN_SUCCESS) 458 return (rv); 459 if (object == NULL) 460 return (KERN_SUCCESS); 461 for (; start < end; start += sz) { 462 sf = vm_imgact_map_page(object, offset); 463 if (sf == NULL) 464 return (KERN_FAILURE); 465 off = offset - trunc_page(offset); 466 sz = end - start; 467 if (sz > PAGE_SIZE - off) 468 sz = PAGE_SIZE - off; 469 error = copyout((caddr_t)sf_buf_kva(sf) + off, 470 (caddr_t)start, sz); 471 vm_imgact_unmap_page(sf); 472 if (error != 0) 473 return (KERN_FAILURE); 474 offset += sz; 475 } 476 rv = KERN_SUCCESS; 477 } else { 478 vm_object_reference(object); 479 vm_map_lock(map); 480 rv = vm_map_insert(map, object, offset, start, end, 481 prot, VM_PROT_ALL, cow); 482 vm_map_unlock(map); 483 if (rv != KERN_SUCCESS) 484 vm_object_deallocate(object); 485 } 486 return (rv); 487 } else { 488 return (KERN_SUCCESS); 489 } 490 } 491 492 static int 493 __elfN(load_section)(struct image_params *imgp, vm_offset_t offset, 494 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot, 495 size_t pagesize) 496 { 497 struct sf_buf *sf; 498 size_t map_len; 499 vm_map_t map; 500 vm_object_t object; 501 vm_offset_t map_addr; 502 int error, rv, cow; 503 size_t copy_len; 504 vm_offset_t file_addr; 505 506 /* 507 * It's necessary to fail if the filsz + offset taken from the 508 * header is greater than the actual file pager object's size. 509 * If we were to allow this, then the vm_map_find() below would 510 * walk right off the end of the file object and into the ether. 511 * 512 * While I'm here, might as well check for something else that 513 * is invalid: filsz cannot be greater than memsz. 514 */ 515 if ((off_t)filsz + offset > imgp->attr->va_size || filsz > memsz) { 516 uprintf("elf_load_section: truncated ELF file\n"); 517 return (ENOEXEC); 518 } 519 520 object = imgp->object; 521 map = &imgp->proc->p_vmspace->vm_map; 522 map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize); 523 file_addr = trunc_page_ps(offset, pagesize); 524 525 /* 526 * We have two choices. We can either clear the data in the last page 527 * of an oversized mapping, or we can start the anon mapping a page 528 * early and copy the initialized data into that first page. We 529 * choose the second.. 530 */ 531 if (memsz > filsz) 532 map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr; 533 else 534 map_len = round_page_ps(offset + filsz, pagesize) - file_addr; 535 536 if (map_len != 0) { 537 /* cow flags: don't dump readonly sections in core */ 538 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT | 539 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP); 540 541 rv = __elfN(map_insert)(map, 542 object, 543 file_addr, /* file offset */ 544 map_addr, /* virtual start */ 545 map_addr + map_len,/* virtual end */ 546 prot, 547 cow); 548 if (rv != KERN_SUCCESS) 549 return (EINVAL); 550 551 /* we can stop now if we've covered it all */ 552 if (memsz == filsz) { 553 return (0); 554 } 555 } 556 557 558 /* 559 * We have to get the remaining bit of the file into the first part 560 * of the oversized map segment. This is normally because the .data 561 * segment in the file is extended to provide bss. It's a neat idea 562 * to try and save a page, but it's a pain in the behind to implement. 563 */ 564 copy_len = (offset + filsz) - trunc_page_ps(offset + filsz, pagesize); 565 map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize); 566 map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) - 567 map_addr; 568 569 /* This had damn well better be true! */ 570 if (map_len != 0) { 571 rv = __elfN(map_insert)(map, NULL, 0, map_addr, map_addr + 572 map_len, VM_PROT_ALL, 0); 573 if (rv != KERN_SUCCESS) { 574 return (EINVAL); 575 } 576 } 577 578 if (copy_len != 0) { 579 vm_offset_t off; 580 581 sf = vm_imgact_map_page(object, offset + filsz); 582 if (sf == NULL) 583 return (EIO); 584 585 /* send the page fragment to user space */ 586 off = trunc_page_ps(offset + filsz, pagesize) - 587 trunc_page(offset + filsz); 588 error = copyout((caddr_t)sf_buf_kva(sf) + off, 589 (caddr_t)map_addr, copy_len); 590 vm_imgact_unmap_page(sf); 591 if (error) { 592 return (error); 593 } 594 } 595 596 /* 597 * set it to the specified protection. 598 * XXX had better undo the damage from pasting over the cracks here! 599 */ 600 vm_map_protect(map, trunc_page(map_addr), round_page(map_addr + 601 map_len), prot, FALSE); 602 603 return (0); 604 } 605 606 /* 607 * Load the file "file" into memory. It may be either a shared object 608 * or an executable. 609 * 610 * The "addr" reference parameter is in/out. On entry, it specifies 611 * the address where a shared object should be loaded. If the file is 612 * an executable, this value is ignored. On exit, "addr" specifies 613 * where the file was actually loaded. 614 * 615 * The "entry" reference parameter is out only. On exit, it specifies 616 * the entry point for the loaded file. 617 */ 618 static int 619 __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 620 u_long *entry, size_t pagesize) 621 { 622 struct { 623 struct nameidata nd; 624 struct vattr attr; 625 struct image_params image_params; 626 } *tempdata; 627 const Elf_Ehdr *hdr = NULL; 628 const Elf_Phdr *phdr = NULL; 629 struct nameidata *nd; 630 struct vattr *attr; 631 struct image_params *imgp; 632 vm_prot_t prot; 633 u_long rbase; 634 u_long base_addr = 0; 635 int error, i, numsegs; 636 637 #ifdef CAPABILITY_MODE 638 /* 639 * XXXJA: This check can go away once we are sufficiently confident 640 * that the checks in namei() are correct. 641 */ 642 if (IN_CAPABILITY_MODE(curthread)) 643 return (ECAPMODE); 644 #endif 645 646 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK); 647 nd = &tempdata->nd; 648 attr = &tempdata->attr; 649 imgp = &tempdata->image_params; 650 651 /* 652 * Initialize part of the common data 653 */ 654 imgp->proc = p; 655 imgp->attr = attr; 656 imgp->firstpage = NULL; 657 imgp->image_header = NULL; 658 imgp->object = NULL; 659 imgp->execlabel = NULL; 660 661 NDINIT(nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_SYSSPACE, file, curthread); 662 if ((error = namei(nd)) != 0) { 663 nd->ni_vp = NULL; 664 goto fail; 665 } 666 NDFREE(nd, NDF_ONLY_PNBUF); 667 imgp->vp = nd->ni_vp; 668 669 /* 670 * Check permissions, modes, uid, etc on the file, and "open" it. 671 */ 672 error = exec_check_permissions(imgp); 673 if (error) 674 goto fail; 675 676 error = exec_map_first_page(imgp); 677 if (error) 678 goto fail; 679 680 /* 681 * Also make certain that the interpreter stays the same, so set 682 * its VV_TEXT flag, too. 683 */ 684 VOP_SET_TEXT(nd->ni_vp); 685 686 imgp->object = nd->ni_vp->v_object; 687 688 hdr = (const Elf_Ehdr *)imgp->image_header; 689 if ((error = __elfN(check_header)(hdr)) != 0) 690 goto fail; 691 if (hdr->e_type == ET_DYN) 692 rbase = *addr; 693 else if (hdr->e_type == ET_EXEC) 694 rbase = 0; 695 else { 696 error = ENOEXEC; 697 goto fail; 698 } 699 700 /* Only support headers that fit within first page for now */ 701 if ((hdr->e_phoff > PAGE_SIZE) || 702 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) { 703 error = ENOEXEC; 704 goto fail; 705 } 706 707 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 708 if (!aligned(phdr, Elf_Addr)) { 709 error = ENOEXEC; 710 goto fail; 711 } 712 713 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) { 714 if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) { 715 /* Loadable segment */ 716 prot = __elfN(trans_prot)(phdr[i].p_flags); 717 error = __elfN(load_section)(imgp, phdr[i].p_offset, 718 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase, 719 phdr[i].p_memsz, phdr[i].p_filesz, prot, pagesize); 720 if (error != 0) 721 goto fail; 722 /* 723 * Establish the base address if this is the 724 * first segment. 725 */ 726 if (numsegs == 0) 727 base_addr = trunc_page(phdr[i].p_vaddr + 728 rbase); 729 numsegs++; 730 } 731 } 732 *addr = base_addr; 733 *entry = (unsigned long)hdr->e_entry + rbase; 734 735 fail: 736 if (imgp->firstpage) 737 exec_unmap_first_page(imgp); 738 739 if (nd->ni_vp) 740 vput(nd->ni_vp); 741 742 free(tempdata, M_TEMP); 743 744 return (error); 745 } 746 747 static int 748 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp) 749 { 750 struct thread *td; 751 const Elf_Ehdr *hdr; 752 const Elf_Phdr *phdr; 753 Elf_Auxargs *elf_auxargs; 754 struct vmspace *vmspace; 755 const char *err_str, *newinterp; 756 char *interp, *interp_buf, *path; 757 Elf_Brandinfo *brand_info; 758 struct sysentvec *sv; 759 vm_prot_t prot; 760 u_long text_size, data_size, total_size, text_addr, data_addr; 761 u_long seg_size, seg_addr, addr, baddr, et_dyn_addr, entry, proghdr; 762 int32_t osrel; 763 int error, i, n, interp_name_len, have_interp; 764 765 hdr = (const Elf_Ehdr *)imgp->image_header; 766 767 /* 768 * Do we have a valid ELF header ? 769 * 770 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later 771 * if particular brand doesn't support it. 772 */ 773 if (__elfN(check_header)(hdr) != 0 || 774 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)) 775 return (-1); 776 777 /* 778 * From here on down, we return an errno, not -1, as we've 779 * detected an ELF file. 780 */ 781 782 if ((hdr->e_phoff > PAGE_SIZE) || 783 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) { 784 /* Only support headers in first page for now */ 785 uprintf("Program headers not in the first page\n"); 786 return (ENOEXEC); 787 } 788 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 789 if (!aligned(phdr, Elf_Addr)) { 790 uprintf("Unaligned program headers\n"); 791 return (ENOEXEC); 792 } 793 794 n = error = 0; 795 baddr = 0; 796 osrel = 0; 797 text_size = data_size = total_size = text_addr = data_addr = 0; 798 entry = proghdr = 0; 799 interp_name_len = 0; 800 err_str = newinterp = NULL; 801 interp = interp_buf = NULL; 802 td = curthread; 803 804 for (i = 0; i < hdr->e_phnum; i++) { 805 switch (phdr[i].p_type) { 806 case PT_LOAD: 807 if (n == 0) 808 baddr = phdr[i].p_vaddr; 809 n++; 810 break; 811 case PT_INTERP: 812 /* Path to interpreter */ 813 if (phdr[i].p_filesz > MAXPATHLEN) { 814 uprintf("Invalid PT_INTERP\n"); 815 error = ENOEXEC; 816 goto ret; 817 } 818 if (interp != NULL) { 819 uprintf("Multiple PT_INTERP headers\n"); 820 error = ENOEXEC; 821 goto ret; 822 } 823 interp_name_len = phdr[i].p_filesz; 824 if (phdr[i].p_offset > PAGE_SIZE || 825 interp_name_len > PAGE_SIZE - phdr[i].p_offset) { 826 VOP_UNLOCK(imgp->vp, 0); 827 interp_buf = malloc(interp_name_len + 1, M_TEMP, 828 M_WAITOK); 829 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 830 error = vn_rdwr(UIO_READ, imgp->vp, interp_buf, 831 interp_name_len, phdr[i].p_offset, 832 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 833 NOCRED, NULL, td); 834 if (error != 0) { 835 uprintf("i/o error PT_INTERP\n"); 836 goto ret; 837 } 838 interp_buf[interp_name_len] = '\0'; 839 interp = interp_buf; 840 } else { 841 interp = __DECONST(char *, imgp->image_header) + 842 phdr[i].p_offset; 843 } 844 break; 845 case PT_GNU_STACK: 846 if (__elfN(nxstack)) 847 imgp->stack_prot = 848 __elfN(trans_prot)(phdr[i].p_flags); 849 imgp->stack_sz = phdr[i].p_memsz; 850 break; 851 } 852 } 853 854 brand_info = __elfN(get_brandinfo)(imgp, interp, interp_name_len, 855 &osrel); 856 if (brand_info == NULL) { 857 uprintf("ELF binary type \"%u\" not known.\n", 858 hdr->e_ident[EI_OSABI]); 859 error = ENOEXEC; 860 goto ret; 861 } 862 et_dyn_addr = 0; 863 if (hdr->e_type == ET_DYN) { 864 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) { 865 uprintf("Cannot execute shared object\n"); 866 error = ENOEXEC; 867 goto ret; 868 } 869 /* 870 * Honour the base load address from the dso if it is 871 * non-zero for some reason. 872 */ 873 if (baddr == 0) 874 et_dyn_addr = ET_DYN_LOAD_ADDR; 875 } 876 sv = brand_info->sysvec; 877 if (interp != NULL && brand_info->interp_newpath != NULL) 878 newinterp = brand_info->interp_newpath; 879 880 /* 881 * Avoid a possible deadlock if the current address space is destroyed 882 * and that address space maps the locked vnode. In the common case, 883 * the locked vnode's v_usecount is decremented but remains greater 884 * than zero. Consequently, the vnode lock is not needed by vrele(). 885 * However, in cases where the vnode lock is external, such as nullfs, 886 * v_usecount may become zero. 887 * 888 * The VV_TEXT flag prevents modifications to the executable while 889 * the vnode is unlocked. 890 */ 891 VOP_UNLOCK(imgp->vp, 0); 892 893 error = exec_new_vmspace(imgp, sv); 894 imgp->proc->p_sysent = sv; 895 896 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 897 if (error != 0) 898 goto ret; 899 900 for (i = 0; i < hdr->e_phnum; i++) { 901 switch (phdr[i].p_type) { 902 case PT_LOAD: /* Loadable segment */ 903 if (phdr[i].p_memsz == 0) 904 break; 905 prot = __elfN(trans_prot)(phdr[i].p_flags); 906 error = __elfN(load_section)(imgp, phdr[i].p_offset, 907 (caddr_t)(uintptr_t)phdr[i].p_vaddr + et_dyn_addr, 908 phdr[i].p_memsz, phdr[i].p_filesz, prot, 909 sv->sv_pagesize); 910 if (error != 0) 911 goto ret; 912 913 /* 914 * If this segment contains the program headers, 915 * remember their virtual address for the AT_PHDR 916 * aux entry. Static binaries don't usually include 917 * a PT_PHDR entry. 918 */ 919 if (phdr[i].p_offset == 0 && 920 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize 921 <= phdr[i].p_filesz) 922 proghdr = phdr[i].p_vaddr + hdr->e_phoff + 923 et_dyn_addr; 924 925 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr); 926 seg_size = round_page(phdr[i].p_memsz + 927 phdr[i].p_vaddr + et_dyn_addr - seg_addr); 928 929 /* 930 * Make the largest executable segment the official 931 * text segment and all others data. 932 * 933 * Note that obreak() assumes that data_addr + 934 * data_size == end of data load area, and the ELF 935 * file format expects segments to be sorted by 936 * address. If multiple data segments exist, the 937 * last one will be used. 938 */ 939 940 if (phdr[i].p_flags & PF_X && text_size < seg_size) { 941 text_size = seg_size; 942 text_addr = seg_addr; 943 } else { 944 data_size = seg_size; 945 data_addr = seg_addr; 946 } 947 total_size += seg_size; 948 break; 949 case PT_PHDR: /* Program header table info */ 950 proghdr = phdr[i].p_vaddr + et_dyn_addr; 951 break; 952 default: 953 break; 954 } 955 } 956 957 if (data_addr == 0 && data_size == 0) { 958 data_addr = text_addr; 959 data_size = text_size; 960 } 961 962 entry = (u_long)hdr->e_entry + et_dyn_addr; 963 964 /* 965 * Check limits. It should be safe to check the 966 * limits after loading the segments since we do 967 * not actually fault in all the segments pages. 968 */ 969 PROC_LOCK(imgp->proc); 970 if (data_size > lim_cur_proc(imgp->proc, RLIMIT_DATA)) 971 err_str = "Data segment size exceeds process limit"; 972 else if (text_size > maxtsiz) 973 err_str = "Text segment size exceeds system limit"; 974 else if (total_size > lim_cur_proc(imgp->proc, RLIMIT_VMEM)) 975 err_str = "Total segment size exceeds process limit"; 976 else if (racct_set(imgp->proc, RACCT_DATA, data_size) != 0) 977 err_str = "Data segment size exceeds resource limit"; 978 else if (racct_set(imgp->proc, RACCT_VMEM, total_size) != 0) 979 err_str = "Total segment size exceeds resource limit"; 980 if (err_str != NULL) { 981 PROC_UNLOCK(imgp->proc); 982 uprintf("%s\n", err_str); 983 error = ENOMEM; 984 goto ret; 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 /* 994 * We load the dynamic linker where a userland call 995 * to mmap(0, ...) would put it. The rationale behind this 996 * calculation is that it leaves room for the heap to grow to 997 * its maximum allowed size. 998 */ 999 addr = round_page((vm_offset_t)vmspace->vm_daddr + lim_max(td, 1000 RLIMIT_DATA)); 1001 PROC_UNLOCK(imgp->proc); 1002 1003 imgp->entry_addr = entry; 1004 1005 if (interp != NULL) { 1006 have_interp = FALSE; 1007 VOP_UNLOCK(imgp->vp, 0); 1008 if (brand_info->emul_path != NULL && 1009 brand_info->emul_path[0] != '\0') { 1010 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1011 snprintf(path, MAXPATHLEN, "%s%s", 1012 brand_info->emul_path, interp); 1013 error = __elfN(load_file)(imgp->proc, path, &addr, 1014 &imgp->entry_addr, sv->sv_pagesize); 1015 free(path, M_TEMP); 1016 if (error == 0) 1017 have_interp = TRUE; 1018 } 1019 if (!have_interp && newinterp != NULL && 1020 (brand_info->interp_path == NULL || 1021 strcmp(interp, brand_info->interp_path) == 0)) { 1022 error = __elfN(load_file)(imgp->proc, newinterp, &addr, 1023 &imgp->entry_addr, sv->sv_pagesize); 1024 if (error == 0) 1025 have_interp = TRUE; 1026 } 1027 if (!have_interp) { 1028 error = __elfN(load_file)(imgp->proc, interp, &addr, 1029 &imgp->entry_addr, sv->sv_pagesize); 1030 } 1031 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 1032 if (error != 0) { 1033 uprintf("ELF interpreter %s not found, error %d\n", 1034 interp, error); 1035 goto ret; 1036 } 1037 } else 1038 addr = et_dyn_addr; 1039 1040 /* 1041 * Construct auxargs table (used by the fixup routine) 1042 */ 1043 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK); 1044 elf_auxargs->execfd = -1; 1045 elf_auxargs->phdr = proghdr; 1046 elf_auxargs->phent = hdr->e_phentsize; 1047 elf_auxargs->phnum = hdr->e_phnum; 1048 elf_auxargs->pagesz = PAGE_SIZE; 1049 elf_auxargs->base = addr; 1050 elf_auxargs->flags = 0; 1051 elf_auxargs->entry = entry; 1052 elf_auxargs->hdr_eflags = hdr->e_flags; 1053 1054 imgp->auxargs = elf_auxargs; 1055 imgp->interpreted = 0; 1056 imgp->reloc_base = addr; 1057 imgp->proc->p_osrel = osrel; 1058 1059 ret: 1060 free(interp_buf, M_TEMP); 1061 return (error); 1062 } 1063 1064 #define suword __CONCAT(suword, __ELF_WORD_SIZE) 1065 1066 int 1067 __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp) 1068 { 1069 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs; 1070 Elf_Addr *base; 1071 Elf_Addr *pos; 1072 1073 base = (Elf_Addr *)*stack_base; 1074 pos = base + (imgp->args->argc + imgp->args->envc + 2); 1075 1076 if (args->execfd != -1) 1077 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 1078 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 1079 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 1080 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 1081 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 1082 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 1083 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 1084 AUXARGS_ENTRY(pos, AT_BASE, args->base); 1085 #ifdef AT_EHDRFLAGS 1086 AUXARGS_ENTRY(pos, AT_EHDRFLAGS, args->hdr_eflags); 1087 #endif 1088 if (imgp->execpathp != 0) 1089 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp); 1090 AUXARGS_ENTRY(pos, AT_OSRELDATE, 1091 imgp->proc->p_ucred->cr_prison->pr_osreldate); 1092 if (imgp->canary != 0) { 1093 AUXARGS_ENTRY(pos, AT_CANARY, imgp->canary); 1094 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen); 1095 } 1096 AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus); 1097 if (imgp->pagesizes != 0) { 1098 AUXARGS_ENTRY(pos, AT_PAGESIZES, imgp->pagesizes); 1099 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen); 1100 } 1101 if (imgp->sysent->sv_timekeep_base != 0) { 1102 AUXARGS_ENTRY(pos, AT_TIMEKEEP, 1103 imgp->sysent->sv_timekeep_base); 1104 } 1105 AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj 1106 != NULL && imgp->stack_prot != 0 ? imgp->stack_prot : 1107 imgp->sysent->sv_stackprot); 1108 AUXARGS_ENTRY(pos, AT_NULL, 0); 1109 1110 free(imgp->auxargs, M_TEMP); 1111 imgp->auxargs = NULL; 1112 1113 base--; 1114 suword(base, (long)imgp->args->argc); 1115 *stack_base = (register_t *)base; 1116 return (0); 1117 } 1118 1119 /* 1120 * Code for generating ELF core dumps. 1121 */ 1122 1123 typedef void (*segment_callback)(vm_map_entry_t, void *); 1124 1125 /* Closure for cb_put_phdr(). */ 1126 struct phdr_closure { 1127 Elf_Phdr *phdr; /* Program header to fill in */ 1128 Elf_Off offset; /* Offset of segment in core file */ 1129 }; 1130 1131 /* Closure for cb_size_segment(). */ 1132 struct sseg_closure { 1133 int count; /* Count of writable segments. */ 1134 size_t size; /* Total size of all writable segments. */ 1135 }; 1136 1137 typedef void (*outfunc_t)(void *, struct sbuf *, size_t *); 1138 1139 struct note_info { 1140 int type; /* Note type. */ 1141 outfunc_t outfunc; /* Output function. */ 1142 void *outarg; /* Argument for the output function. */ 1143 size_t outsize; /* Output size. */ 1144 TAILQ_ENTRY(note_info) link; /* Link to the next note info. */ 1145 }; 1146 1147 TAILQ_HEAD(note_info_list, note_info); 1148 1149 /* Coredump output parameters. */ 1150 struct coredump_params { 1151 off_t offset; 1152 struct ucred *active_cred; 1153 struct ucred *file_cred; 1154 struct thread *td; 1155 struct vnode *vp; 1156 struct gzio_stream *gzs; 1157 }; 1158 1159 static void cb_put_phdr(vm_map_entry_t, void *); 1160 static void cb_size_segment(vm_map_entry_t, void *); 1161 static int core_write(struct coredump_params *, const void *, size_t, off_t, 1162 enum uio_seg); 1163 static void each_dumpable_segment(struct thread *, segment_callback, void *); 1164 static int __elfN(corehdr)(struct coredump_params *, int, void *, size_t, 1165 struct note_info_list *, size_t); 1166 static void __elfN(prepare_notes)(struct thread *, struct note_info_list *, 1167 size_t *); 1168 static void __elfN(puthdr)(struct thread *, void *, size_t, int, size_t); 1169 static void __elfN(putnote)(struct note_info *, struct sbuf *); 1170 static size_t register_note(struct note_info_list *, int, outfunc_t, void *); 1171 static int sbuf_drain_core_output(void *, const char *, int); 1172 static int sbuf_drain_count(void *arg, const char *data, int len); 1173 1174 static void __elfN(note_fpregset)(void *, struct sbuf *, size_t *); 1175 static void __elfN(note_prpsinfo)(void *, struct sbuf *, size_t *); 1176 static void __elfN(note_prstatus)(void *, struct sbuf *, size_t *); 1177 static void __elfN(note_threadmd)(void *, struct sbuf *, size_t *); 1178 static void __elfN(note_thrmisc)(void *, struct sbuf *, size_t *); 1179 static void __elfN(note_procstat_auxv)(void *, struct sbuf *, size_t *); 1180 static void __elfN(note_procstat_proc)(void *, struct sbuf *, size_t *); 1181 static void __elfN(note_procstat_psstrings)(void *, struct sbuf *, size_t *); 1182 static void note_procstat_files(void *, struct sbuf *, size_t *); 1183 static void note_procstat_groups(void *, struct sbuf *, size_t *); 1184 static void note_procstat_osrel(void *, struct sbuf *, size_t *); 1185 static void note_procstat_rlimit(void *, struct sbuf *, size_t *); 1186 static void note_procstat_umask(void *, struct sbuf *, size_t *); 1187 static void note_procstat_vmmap(void *, struct sbuf *, size_t *); 1188 1189 #ifdef GZIO 1190 extern int compress_user_cores_gzlevel; 1191 1192 /* 1193 * Write out a core segment to the compression stream. 1194 */ 1195 static int 1196 compress_chunk(struct coredump_params *p, char *base, char *buf, u_int len) 1197 { 1198 u_int chunk_len; 1199 int error; 1200 1201 while (len > 0) { 1202 chunk_len = MIN(len, CORE_BUF_SIZE); 1203 1204 /* 1205 * We can get EFAULT error here. 1206 * In that case zero out the current chunk of the segment. 1207 */ 1208 error = copyin(base, buf, chunk_len); 1209 if (error != 0) 1210 bzero(buf, chunk_len); 1211 error = gzio_write(p->gzs, buf, chunk_len); 1212 if (error != 0) 1213 break; 1214 base += chunk_len; 1215 len -= chunk_len; 1216 } 1217 return (error); 1218 } 1219 1220 static int 1221 core_gz_write(void *base, size_t len, off_t offset, void *arg) 1222 { 1223 1224 return (core_write((struct coredump_params *)arg, base, len, offset, 1225 UIO_SYSSPACE)); 1226 } 1227 #endif /* GZIO */ 1228 1229 static int 1230 core_write(struct coredump_params *p, const void *base, size_t len, 1231 off_t offset, enum uio_seg seg) 1232 { 1233 1234 return (vn_rdwr_inchunks(UIO_WRITE, p->vp, __DECONST(void *, base), 1235 len, offset, seg, IO_UNIT | IO_DIRECT | IO_RANGELOCKED, 1236 p->active_cred, p->file_cred, NULL, p->td)); 1237 } 1238 1239 static int 1240 core_output(void *base, size_t len, off_t offset, struct coredump_params *p, 1241 void *tmpbuf) 1242 { 1243 int error; 1244 1245 #ifdef GZIO 1246 if (p->gzs != NULL) 1247 return (compress_chunk(p, base, tmpbuf, len)); 1248 #endif 1249 /* 1250 * EFAULT is a non-fatal error that we can get, for example, 1251 * if the segment is backed by a file but extends beyond its 1252 * end. 1253 */ 1254 error = core_write(p, base, len, offset, UIO_USERSPACE); 1255 if (error == EFAULT) { 1256 log(LOG_WARNING, "Failed to fully fault in a core file segment " 1257 "at VA %p with size 0x%zx to be written at offset 0x%jx " 1258 "for process %s\n", base, len, offset, curproc->p_comm); 1259 1260 /* 1261 * Write a "real" zero byte at the end of the target region 1262 * in the case this is the last segment. 1263 * The intermediate space will be implicitly zero-filled. 1264 */ 1265 error = core_write(p, zero_region, 1, offset + len - 1, 1266 UIO_SYSSPACE); 1267 } 1268 return (error); 1269 } 1270 1271 /* 1272 * Drain into a core file. 1273 */ 1274 static int 1275 sbuf_drain_core_output(void *arg, const char *data, int len) 1276 { 1277 struct coredump_params *p; 1278 int error, locked; 1279 1280 p = (struct coredump_params *)arg; 1281 1282 /* 1283 * Some kern_proc out routines that print to this sbuf may 1284 * call us with the process lock held. Draining with the 1285 * non-sleepable lock held is unsafe. The lock is needed for 1286 * those routines when dumping a live process. In our case we 1287 * can safely release the lock before draining and acquire 1288 * again after. 1289 */ 1290 locked = PROC_LOCKED(p->td->td_proc); 1291 if (locked) 1292 PROC_UNLOCK(p->td->td_proc); 1293 #ifdef GZIO 1294 if (p->gzs != NULL) 1295 error = gzio_write(p->gzs, __DECONST(char *, data), len); 1296 else 1297 #endif 1298 error = core_write(p, __DECONST(void *, data), len, p->offset, 1299 UIO_SYSSPACE); 1300 if (locked) 1301 PROC_LOCK(p->td->td_proc); 1302 if (error != 0) 1303 return (-error); 1304 p->offset += len; 1305 return (len); 1306 } 1307 1308 /* 1309 * Drain into a counter. 1310 */ 1311 static int 1312 sbuf_drain_count(void *arg, const char *data __unused, int len) 1313 { 1314 size_t *sizep; 1315 1316 sizep = (size_t *)arg; 1317 *sizep += len; 1318 return (len); 1319 } 1320 1321 int 1322 __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags) 1323 { 1324 struct ucred *cred = td->td_ucred; 1325 int error = 0; 1326 struct sseg_closure seginfo; 1327 struct note_info_list notelst; 1328 struct coredump_params params; 1329 struct note_info *ninfo; 1330 void *hdr, *tmpbuf; 1331 size_t hdrsize, notesz, coresize; 1332 #ifdef GZIO 1333 boolean_t compress; 1334 1335 compress = (flags & IMGACT_CORE_COMPRESS) != 0; 1336 #endif 1337 hdr = NULL; 1338 tmpbuf = NULL; 1339 TAILQ_INIT(¬elst); 1340 1341 /* Size the program segments. */ 1342 seginfo.count = 0; 1343 seginfo.size = 0; 1344 each_dumpable_segment(td, cb_size_segment, &seginfo); 1345 1346 /* 1347 * Collect info about the core file header area. 1348 */ 1349 hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count); 1350 if (seginfo.count + 1 >= PN_XNUM) 1351 hdrsize += sizeof(Elf_Shdr); 1352 __elfN(prepare_notes)(td, ¬elst, ¬esz); 1353 coresize = round_page(hdrsize + notesz) + seginfo.size; 1354 1355 /* Set up core dump parameters. */ 1356 params.offset = 0; 1357 params.active_cred = cred; 1358 params.file_cred = NOCRED; 1359 params.td = td; 1360 params.vp = vp; 1361 params.gzs = NULL; 1362 1363 #ifdef RACCT 1364 if (racct_enable) { 1365 PROC_LOCK(td->td_proc); 1366 error = racct_add(td->td_proc, RACCT_CORE, coresize); 1367 PROC_UNLOCK(td->td_proc); 1368 if (error != 0) { 1369 error = EFAULT; 1370 goto done; 1371 } 1372 } 1373 #endif 1374 if (coresize >= limit) { 1375 error = EFAULT; 1376 goto done; 1377 } 1378 1379 #ifdef GZIO 1380 /* Create a compression stream if necessary. */ 1381 if (compress) { 1382 params.gzs = gzio_init(core_gz_write, GZIO_DEFLATE, 1383 CORE_BUF_SIZE, compress_user_cores_gzlevel, ¶ms); 1384 if (params.gzs == NULL) { 1385 error = EFAULT; 1386 goto done; 1387 } 1388 tmpbuf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO); 1389 } 1390 #endif 1391 1392 /* 1393 * Allocate memory for building the header, fill it up, 1394 * and write it out following the notes. 1395 */ 1396 hdr = malloc(hdrsize, M_TEMP, M_WAITOK); 1397 error = __elfN(corehdr)(¶ms, seginfo.count, hdr, hdrsize, ¬elst, 1398 notesz); 1399 1400 /* Write the contents of all of the writable segments. */ 1401 if (error == 0) { 1402 Elf_Phdr *php; 1403 off_t offset; 1404 int i; 1405 1406 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1; 1407 offset = round_page(hdrsize + notesz); 1408 for (i = 0; i < seginfo.count; i++) { 1409 error = core_output((caddr_t)(uintptr_t)php->p_vaddr, 1410 php->p_filesz, offset, ¶ms, tmpbuf); 1411 if (error != 0) 1412 break; 1413 offset += php->p_filesz; 1414 php++; 1415 } 1416 #ifdef GZIO 1417 if (error == 0 && compress) 1418 error = gzio_flush(params.gzs); 1419 #endif 1420 } 1421 if (error) { 1422 log(LOG_WARNING, 1423 "Failed to write core file for process %s (error %d)\n", 1424 curproc->p_comm, error); 1425 } 1426 1427 done: 1428 #ifdef GZIO 1429 if (compress) { 1430 free(tmpbuf, M_TEMP); 1431 if (params.gzs != NULL) 1432 gzio_fini(params.gzs); 1433 } 1434 #endif 1435 while ((ninfo = TAILQ_FIRST(¬elst)) != NULL) { 1436 TAILQ_REMOVE(¬elst, ninfo, link); 1437 free(ninfo, M_TEMP); 1438 } 1439 if (hdr != NULL) 1440 free(hdr, M_TEMP); 1441 1442 return (error); 1443 } 1444 1445 /* 1446 * A callback for each_dumpable_segment() to write out the segment's 1447 * program header entry. 1448 */ 1449 static void 1450 cb_put_phdr(entry, closure) 1451 vm_map_entry_t entry; 1452 void *closure; 1453 { 1454 struct phdr_closure *phc = (struct phdr_closure *)closure; 1455 Elf_Phdr *phdr = phc->phdr; 1456 1457 phc->offset = round_page(phc->offset); 1458 1459 phdr->p_type = PT_LOAD; 1460 phdr->p_offset = phc->offset; 1461 phdr->p_vaddr = entry->start; 1462 phdr->p_paddr = 0; 1463 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 1464 phdr->p_align = PAGE_SIZE; 1465 phdr->p_flags = __elfN(untrans_prot)(entry->protection); 1466 1467 phc->offset += phdr->p_filesz; 1468 phc->phdr++; 1469 } 1470 1471 /* 1472 * A callback for each_dumpable_segment() to gather information about 1473 * the number of segments and their total size. 1474 */ 1475 static void 1476 cb_size_segment(vm_map_entry_t entry, void *closure) 1477 { 1478 struct sseg_closure *ssc = (struct sseg_closure *)closure; 1479 1480 ssc->count++; 1481 ssc->size += entry->end - entry->start; 1482 } 1483 1484 /* 1485 * For each writable segment in the process's memory map, call the given 1486 * function with a pointer to the map entry and some arbitrary 1487 * caller-supplied data. 1488 */ 1489 static void 1490 each_dumpable_segment(struct thread *td, segment_callback func, void *closure) 1491 { 1492 struct proc *p = td->td_proc; 1493 vm_map_t map = &p->p_vmspace->vm_map; 1494 vm_map_entry_t entry; 1495 vm_object_t backing_object, object; 1496 boolean_t ignore_entry; 1497 1498 vm_map_lock_read(map); 1499 for (entry = map->header.next; entry != &map->header; 1500 entry = entry->next) { 1501 /* 1502 * Don't dump inaccessible mappings, deal with legacy 1503 * coredump mode. 1504 * 1505 * Note that read-only segments related to the elf binary 1506 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer 1507 * need to arbitrarily ignore such segments. 1508 */ 1509 if (elf_legacy_coredump) { 1510 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW) 1511 continue; 1512 } else { 1513 if ((entry->protection & VM_PROT_ALL) == 0) 1514 continue; 1515 } 1516 1517 /* 1518 * Dont include memory segment in the coredump if 1519 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in 1520 * madvise(2). Do not dump submaps (i.e. parts of the 1521 * kernel map). 1522 */ 1523 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP)) 1524 continue; 1525 1526 if ((object = entry->object.vm_object) == NULL) 1527 continue; 1528 1529 /* Ignore memory-mapped devices and such things. */ 1530 VM_OBJECT_RLOCK(object); 1531 while ((backing_object = object->backing_object) != NULL) { 1532 VM_OBJECT_RLOCK(backing_object); 1533 VM_OBJECT_RUNLOCK(object); 1534 object = backing_object; 1535 } 1536 ignore_entry = object->type != OBJT_DEFAULT && 1537 object->type != OBJT_SWAP && object->type != OBJT_VNODE && 1538 object->type != OBJT_PHYS; 1539 VM_OBJECT_RUNLOCK(object); 1540 if (ignore_entry) 1541 continue; 1542 1543 (*func)(entry, closure); 1544 } 1545 vm_map_unlock_read(map); 1546 } 1547 1548 /* 1549 * Write the core file header to the file, including padding up to 1550 * the page boundary. 1551 */ 1552 static int 1553 __elfN(corehdr)(struct coredump_params *p, int numsegs, void *hdr, 1554 size_t hdrsize, struct note_info_list *notelst, size_t notesz) 1555 { 1556 struct note_info *ninfo; 1557 struct sbuf *sb; 1558 int error; 1559 1560 /* Fill in the header. */ 1561 bzero(hdr, hdrsize); 1562 __elfN(puthdr)(p->td, hdr, hdrsize, numsegs, notesz); 1563 1564 sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN); 1565 sbuf_set_drain(sb, sbuf_drain_core_output, p); 1566 sbuf_start_section(sb, NULL); 1567 sbuf_bcat(sb, hdr, hdrsize); 1568 TAILQ_FOREACH(ninfo, notelst, link) 1569 __elfN(putnote)(ninfo, sb); 1570 /* Align up to a page boundary for the program segments. */ 1571 sbuf_end_section(sb, -1, PAGE_SIZE, 0); 1572 error = sbuf_finish(sb); 1573 sbuf_delete(sb); 1574 1575 return (error); 1576 } 1577 1578 static void 1579 __elfN(prepare_notes)(struct thread *td, struct note_info_list *list, 1580 size_t *sizep) 1581 { 1582 struct proc *p; 1583 struct thread *thr; 1584 size_t size; 1585 1586 p = td->td_proc; 1587 size = 0; 1588 1589 size += register_note(list, NT_PRPSINFO, __elfN(note_prpsinfo), p); 1590 1591 /* 1592 * To have the debugger select the right thread (LWP) as the initial 1593 * thread, we dump the state of the thread passed to us in td first. 1594 * This is the thread that causes the core dump and thus likely to 1595 * be the right thread one wants to have selected in the debugger. 1596 */ 1597 thr = td; 1598 while (thr != NULL) { 1599 size += register_note(list, NT_PRSTATUS, 1600 __elfN(note_prstatus), thr); 1601 size += register_note(list, NT_FPREGSET, 1602 __elfN(note_fpregset), thr); 1603 size += register_note(list, NT_THRMISC, 1604 __elfN(note_thrmisc), thr); 1605 size += register_note(list, -1, 1606 __elfN(note_threadmd), thr); 1607 1608 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) : 1609 TAILQ_NEXT(thr, td_plist); 1610 if (thr == td) 1611 thr = TAILQ_NEXT(thr, td_plist); 1612 } 1613 1614 size += register_note(list, NT_PROCSTAT_PROC, 1615 __elfN(note_procstat_proc), p); 1616 size += register_note(list, NT_PROCSTAT_FILES, 1617 note_procstat_files, p); 1618 size += register_note(list, NT_PROCSTAT_VMMAP, 1619 note_procstat_vmmap, p); 1620 size += register_note(list, NT_PROCSTAT_GROUPS, 1621 note_procstat_groups, p); 1622 size += register_note(list, NT_PROCSTAT_UMASK, 1623 note_procstat_umask, p); 1624 size += register_note(list, NT_PROCSTAT_RLIMIT, 1625 note_procstat_rlimit, p); 1626 size += register_note(list, NT_PROCSTAT_OSREL, 1627 note_procstat_osrel, p); 1628 size += register_note(list, NT_PROCSTAT_PSSTRINGS, 1629 __elfN(note_procstat_psstrings), p); 1630 size += register_note(list, NT_PROCSTAT_AUXV, 1631 __elfN(note_procstat_auxv), p); 1632 1633 *sizep = size; 1634 } 1635 1636 static void 1637 __elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs, 1638 size_t notesz) 1639 { 1640 Elf_Ehdr *ehdr; 1641 Elf_Phdr *phdr; 1642 Elf_Shdr *shdr; 1643 struct phdr_closure phc; 1644 1645 ehdr = (Elf_Ehdr *)hdr; 1646 1647 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1648 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1649 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1650 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1651 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 1652 ehdr->e_ident[EI_DATA] = ELF_DATA; 1653 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 1654 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 1655 ehdr->e_ident[EI_ABIVERSION] = 0; 1656 ehdr->e_ident[EI_PAD] = 0; 1657 ehdr->e_type = ET_CORE; 1658 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1659 ehdr->e_machine = ELF_ARCH32; 1660 #else 1661 ehdr->e_machine = ELF_ARCH; 1662 #endif 1663 ehdr->e_version = EV_CURRENT; 1664 ehdr->e_entry = 0; 1665 ehdr->e_phoff = sizeof(Elf_Ehdr); 1666 ehdr->e_flags = 0; 1667 ehdr->e_ehsize = sizeof(Elf_Ehdr); 1668 ehdr->e_phentsize = sizeof(Elf_Phdr); 1669 ehdr->e_shentsize = sizeof(Elf_Shdr); 1670 ehdr->e_shstrndx = SHN_UNDEF; 1671 if (numsegs + 1 < PN_XNUM) { 1672 ehdr->e_phnum = numsegs + 1; 1673 ehdr->e_shnum = 0; 1674 } else { 1675 ehdr->e_phnum = PN_XNUM; 1676 ehdr->e_shnum = 1; 1677 1678 ehdr->e_shoff = ehdr->e_phoff + 1679 (numsegs + 1) * ehdr->e_phentsize; 1680 KASSERT(ehdr->e_shoff == hdrsize - sizeof(Elf_Shdr), 1681 ("e_shoff: %zu, hdrsize - shdr: %zu", 1682 (size_t)ehdr->e_shoff, hdrsize - sizeof(Elf_Shdr))); 1683 1684 shdr = (Elf_Shdr *)((char *)hdr + ehdr->e_shoff); 1685 memset(shdr, 0, sizeof(*shdr)); 1686 /* 1687 * A special first section is used to hold large segment and 1688 * section counts. This was proposed by Sun Microsystems in 1689 * Solaris and has been adopted by Linux; the standard ELF 1690 * tools are already familiar with the technique. 1691 * 1692 * See table 7-7 of the Solaris "Linker and Libraries Guide" 1693 * (or 12-7 depending on the version of the document) for more 1694 * details. 1695 */ 1696 shdr->sh_type = SHT_NULL; 1697 shdr->sh_size = ehdr->e_shnum; 1698 shdr->sh_link = ehdr->e_shstrndx; 1699 shdr->sh_info = numsegs + 1; 1700 } 1701 1702 /* 1703 * Fill in the program header entries. 1704 */ 1705 phdr = (Elf_Phdr *)((char *)hdr + ehdr->e_phoff); 1706 1707 /* The note segement. */ 1708 phdr->p_type = PT_NOTE; 1709 phdr->p_offset = hdrsize; 1710 phdr->p_vaddr = 0; 1711 phdr->p_paddr = 0; 1712 phdr->p_filesz = notesz; 1713 phdr->p_memsz = 0; 1714 phdr->p_flags = PF_R; 1715 phdr->p_align = ELF_NOTE_ROUNDSIZE; 1716 phdr++; 1717 1718 /* All the writable segments from the program. */ 1719 phc.phdr = phdr; 1720 phc.offset = round_page(hdrsize + notesz); 1721 each_dumpable_segment(td, cb_put_phdr, &phc); 1722 } 1723 1724 static size_t 1725 register_note(struct note_info_list *list, int type, outfunc_t out, void *arg) 1726 { 1727 struct note_info *ninfo; 1728 size_t size, notesize; 1729 1730 size = 0; 1731 out(arg, NULL, &size); 1732 ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK); 1733 ninfo->type = type; 1734 ninfo->outfunc = out; 1735 ninfo->outarg = arg; 1736 ninfo->outsize = size; 1737 TAILQ_INSERT_TAIL(list, ninfo, link); 1738 1739 if (type == -1) 1740 return (size); 1741 1742 notesize = sizeof(Elf_Note) + /* note header */ 1743 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + 1744 /* note name */ 1745 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 1746 1747 return (notesize); 1748 } 1749 1750 static size_t 1751 append_note_data(const void *src, void *dst, size_t len) 1752 { 1753 size_t padded_len; 1754 1755 padded_len = roundup2(len, ELF_NOTE_ROUNDSIZE); 1756 if (dst != NULL) { 1757 bcopy(src, dst, len); 1758 bzero((char *)dst + len, padded_len - len); 1759 } 1760 return (padded_len); 1761 } 1762 1763 size_t 1764 __elfN(populate_note)(int type, void *src, void *dst, size_t size, void **descp) 1765 { 1766 Elf_Note *note; 1767 char *buf; 1768 size_t notesize; 1769 1770 buf = dst; 1771 if (buf != NULL) { 1772 note = (Elf_Note *)buf; 1773 note->n_namesz = sizeof(FREEBSD_ABI_VENDOR); 1774 note->n_descsz = size; 1775 note->n_type = type; 1776 buf += sizeof(*note); 1777 buf += append_note_data(FREEBSD_ABI_VENDOR, buf, 1778 sizeof(FREEBSD_ABI_VENDOR)); 1779 append_note_data(src, buf, size); 1780 if (descp != NULL) 1781 *descp = buf; 1782 } 1783 1784 notesize = sizeof(Elf_Note) + /* note header */ 1785 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + 1786 /* note name */ 1787 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 1788 1789 return (notesize); 1790 } 1791 1792 static void 1793 __elfN(putnote)(struct note_info *ninfo, struct sbuf *sb) 1794 { 1795 Elf_Note note; 1796 ssize_t old_len, sect_len; 1797 size_t new_len, descsz, i; 1798 1799 if (ninfo->type == -1) { 1800 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 1801 return; 1802 } 1803 1804 note.n_namesz = sizeof(FREEBSD_ABI_VENDOR); 1805 note.n_descsz = ninfo->outsize; 1806 note.n_type = ninfo->type; 1807 1808 sbuf_bcat(sb, ¬e, sizeof(note)); 1809 sbuf_start_section(sb, &old_len); 1810 sbuf_bcat(sb, FREEBSD_ABI_VENDOR, sizeof(FREEBSD_ABI_VENDOR)); 1811 sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 1812 if (note.n_descsz == 0) 1813 return; 1814 sbuf_start_section(sb, &old_len); 1815 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 1816 sect_len = sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 1817 if (sect_len < 0) 1818 return; 1819 1820 new_len = (size_t)sect_len; 1821 descsz = roundup(note.n_descsz, ELF_NOTE_ROUNDSIZE); 1822 if (new_len < descsz) { 1823 /* 1824 * It is expected that individual note emitters will correctly 1825 * predict their expected output size and fill up to that size 1826 * themselves, padding in a format-specific way if needed. 1827 * However, in case they don't, just do it here with zeros. 1828 */ 1829 for (i = 0; i < descsz - new_len; i++) 1830 sbuf_putc(sb, 0); 1831 } else if (new_len > descsz) { 1832 /* 1833 * We can't always truncate sb -- we may have drained some 1834 * of it already. 1835 */ 1836 KASSERT(new_len == descsz, ("%s: Note type %u changed as we " 1837 "read it (%zu > %zu). Since it is longer than " 1838 "expected, this coredump's notes are corrupt. THIS " 1839 "IS A BUG in the note_procstat routine for type %u.\n", 1840 __func__, (unsigned)note.n_type, new_len, descsz, 1841 (unsigned)note.n_type)); 1842 } 1843 } 1844 1845 /* 1846 * Miscellaneous note out functions. 1847 */ 1848 1849 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1850 #include <compat/freebsd32/freebsd32.h> 1851 1852 typedef struct prstatus32 elf_prstatus_t; 1853 typedef struct prpsinfo32 elf_prpsinfo_t; 1854 typedef struct fpreg32 elf_prfpregset_t; 1855 typedef struct fpreg32 elf_fpregset_t; 1856 typedef struct reg32 elf_gregset_t; 1857 typedef struct thrmisc32 elf_thrmisc_t; 1858 #define ELF_KERN_PROC_MASK KERN_PROC_MASK32 1859 typedef struct kinfo_proc32 elf_kinfo_proc_t; 1860 typedef uint32_t elf_ps_strings_t; 1861 #else 1862 typedef prstatus_t elf_prstatus_t; 1863 typedef prpsinfo_t elf_prpsinfo_t; 1864 typedef prfpregset_t elf_prfpregset_t; 1865 typedef prfpregset_t elf_fpregset_t; 1866 typedef gregset_t elf_gregset_t; 1867 typedef thrmisc_t elf_thrmisc_t; 1868 #define ELF_KERN_PROC_MASK 0 1869 typedef struct kinfo_proc elf_kinfo_proc_t; 1870 typedef vm_offset_t elf_ps_strings_t; 1871 #endif 1872 1873 static void 1874 __elfN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep) 1875 { 1876 struct sbuf sbarg; 1877 size_t len; 1878 char *cp, *end; 1879 struct proc *p; 1880 elf_prpsinfo_t *psinfo; 1881 int error; 1882 1883 p = (struct proc *)arg; 1884 if (sb != NULL) { 1885 KASSERT(*sizep == sizeof(*psinfo), ("invalid size")); 1886 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK); 1887 psinfo->pr_version = PRPSINFO_VERSION; 1888 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t); 1889 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname)); 1890 PROC_LOCK(p); 1891 if (p->p_args != NULL) { 1892 len = sizeof(psinfo->pr_psargs) - 1; 1893 if (len > p->p_args->ar_length) 1894 len = p->p_args->ar_length; 1895 memcpy(psinfo->pr_psargs, p->p_args->ar_args, len); 1896 PROC_UNLOCK(p); 1897 error = 0; 1898 } else { 1899 _PHOLD(p); 1900 PROC_UNLOCK(p); 1901 sbuf_new(&sbarg, psinfo->pr_psargs, 1902 sizeof(psinfo->pr_psargs), SBUF_FIXEDLEN); 1903 error = proc_getargv(curthread, p, &sbarg); 1904 PRELE(p); 1905 if (sbuf_finish(&sbarg) == 0) 1906 len = sbuf_len(&sbarg) - 1; 1907 else 1908 len = sizeof(psinfo->pr_psargs) - 1; 1909 sbuf_delete(&sbarg); 1910 } 1911 if (error || len == 0) 1912 strlcpy(psinfo->pr_psargs, p->p_comm, 1913 sizeof(psinfo->pr_psargs)); 1914 else { 1915 KASSERT(len < sizeof(psinfo->pr_psargs), 1916 ("len is too long: %zu vs %zu", len, 1917 sizeof(psinfo->pr_psargs))); 1918 cp = psinfo->pr_psargs; 1919 end = cp + len - 1; 1920 for (;;) { 1921 cp = memchr(cp, '\0', end - cp); 1922 if (cp == NULL) 1923 break; 1924 *cp = ' '; 1925 } 1926 } 1927 psinfo->pr_pid = p->p_pid; 1928 sbuf_bcat(sb, psinfo, sizeof(*psinfo)); 1929 free(psinfo, M_TEMP); 1930 } 1931 *sizep = sizeof(*psinfo); 1932 } 1933 1934 static void 1935 __elfN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep) 1936 { 1937 struct thread *td; 1938 elf_prstatus_t *status; 1939 1940 td = (struct thread *)arg; 1941 if (sb != NULL) { 1942 KASSERT(*sizep == sizeof(*status), ("invalid size")); 1943 status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK); 1944 status->pr_version = PRSTATUS_VERSION; 1945 status->pr_statussz = sizeof(elf_prstatus_t); 1946 status->pr_gregsetsz = sizeof(elf_gregset_t); 1947 status->pr_fpregsetsz = sizeof(elf_fpregset_t); 1948 status->pr_osreldate = osreldate; 1949 status->pr_cursig = td->td_proc->p_sig; 1950 status->pr_pid = td->td_tid; 1951 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1952 fill_regs32(td, &status->pr_reg); 1953 #else 1954 fill_regs(td, &status->pr_reg); 1955 #endif 1956 sbuf_bcat(sb, status, sizeof(*status)); 1957 free(status, M_TEMP); 1958 } 1959 *sizep = sizeof(*status); 1960 } 1961 1962 static void 1963 __elfN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep) 1964 { 1965 struct thread *td; 1966 elf_prfpregset_t *fpregset; 1967 1968 td = (struct thread *)arg; 1969 if (sb != NULL) { 1970 KASSERT(*sizep == sizeof(*fpregset), ("invalid size")); 1971 fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK); 1972 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1973 fill_fpregs32(td, fpregset); 1974 #else 1975 fill_fpregs(td, fpregset); 1976 #endif 1977 sbuf_bcat(sb, fpregset, sizeof(*fpregset)); 1978 free(fpregset, M_TEMP); 1979 } 1980 *sizep = sizeof(*fpregset); 1981 } 1982 1983 static void 1984 __elfN(note_thrmisc)(void *arg, struct sbuf *sb, size_t *sizep) 1985 { 1986 struct thread *td; 1987 elf_thrmisc_t thrmisc; 1988 1989 td = (struct thread *)arg; 1990 if (sb != NULL) { 1991 KASSERT(*sizep == sizeof(thrmisc), ("invalid size")); 1992 bzero(&thrmisc._pad, sizeof(thrmisc._pad)); 1993 strcpy(thrmisc.pr_tname, td->td_name); 1994 sbuf_bcat(sb, &thrmisc, sizeof(thrmisc)); 1995 } 1996 *sizep = sizeof(thrmisc); 1997 } 1998 1999 /* 2000 * Allow for MD specific notes, as well as any MD 2001 * specific preparations for writing MI notes. 2002 */ 2003 static void 2004 __elfN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep) 2005 { 2006 struct thread *td; 2007 void *buf; 2008 size_t size; 2009 2010 td = (struct thread *)arg; 2011 size = *sizep; 2012 if (size != 0 && sb != NULL) 2013 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK); 2014 else 2015 buf = NULL; 2016 size = 0; 2017 __elfN(dump_thread)(td, buf, &size); 2018 KASSERT(sb == NULL || *sizep == size, ("invalid size")); 2019 if (size != 0 && sb != NULL) 2020 sbuf_bcat(sb, buf, size); 2021 free(buf, M_TEMP); 2022 *sizep = size; 2023 } 2024 2025 #ifdef KINFO_PROC_SIZE 2026 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE); 2027 #endif 2028 2029 static void 2030 __elfN(note_procstat_proc)(void *arg, struct sbuf *sb, size_t *sizep) 2031 { 2032 struct proc *p; 2033 size_t size; 2034 int structsize; 2035 2036 p = (struct proc *)arg; 2037 size = sizeof(structsize) + p->p_numthreads * 2038 sizeof(elf_kinfo_proc_t); 2039 2040 if (sb != NULL) { 2041 KASSERT(*sizep == size, ("invalid size")); 2042 structsize = sizeof(elf_kinfo_proc_t); 2043 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2044 sx_slock(&proctree_lock); 2045 PROC_LOCK(p); 2046 kern_proc_out(p, sb, ELF_KERN_PROC_MASK); 2047 sx_sunlock(&proctree_lock); 2048 } 2049 *sizep = size; 2050 } 2051 2052 #ifdef KINFO_FILE_SIZE 2053 CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE); 2054 #endif 2055 2056 static void 2057 note_procstat_files(void *arg, struct sbuf *sb, size_t *sizep) 2058 { 2059 struct proc *p; 2060 size_t size, sect_sz, i; 2061 ssize_t start_len, sect_len; 2062 int structsize, filedesc_flags; 2063 2064 if (coredump_pack_fileinfo) 2065 filedesc_flags = KERN_FILEDESC_PACK_KINFO; 2066 else 2067 filedesc_flags = 0; 2068 2069 p = (struct proc *)arg; 2070 structsize = sizeof(struct kinfo_file); 2071 if (sb == NULL) { 2072 size = 0; 2073 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2074 sbuf_set_drain(sb, sbuf_drain_count, &size); 2075 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2076 PROC_LOCK(p); 2077 kern_proc_filedesc_out(p, sb, -1, filedesc_flags); 2078 sbuf_finish(sb); 2079 sbuf_delete(sb); 2080 *sizep = size; 2081 } else { 2082 sbuf_start_section(sb, &start_len); 2083 2084 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2085 PROC_LOCK(p); 2086 kern_proc_filedesc_out(p, sb, *sizep - sizeof(structsize), 2087 filedesc_flags); 2088 2089 sect_len = sbuf_end_section(sb, start_len, 0, 0); 2090 if (sect_len < 0) 2091 return; 2092 sect_sz = sect_len; 2093 2094 KASSERT(sect_sz <= *sizep, 2095 ("kern_proc_filedesc_out did not respect maxlen; " 2096 "requested %zu, got %zu", *sizep - sizeof(structsize), 2097 sect_sz - sizeof(structsize))); 2098 2099 for (i = 0; i < *sizep - sect_sz && sb->s_error == 0; i++) 2100 sbuf_putc(sb, 0); 2101 } 2102 } 2103 2104 #ifdef KINFO_VMENTRY_SIZE 2105 CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE); 2106 #endif 2107 2108 static void 2109 note_procstat_vmmap(void *arg, struct sbuf *sb, size_t *sizep) 2110 { 2111 struct proc *p; 2112 size_t size; 2113 int structsize, vmmap_flags; 2114 2115 if (coredump_pack_vmmapinfo) 2116 vmmap_flags = KERN_VMMAP_PACK_KINFO; 2117 else 2118 vmmap_flags = 0; 2119 2120 p = (struct proc *)arg; 2121 structsize = sizeof(struct kinfo_vmentry); 2122 if (sb == NULL) { 2123 size = 0; 2124 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2125 sbuf_set_drain(sb, sbuf_drain_count, &size); 2126 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2127 PROC_LOCK(p); 2128 kern_proc_vmmap_out(p, sb, -1, vmmap_flags); 2129 sbuf_finish(sb); 2130 sbuf_delete(sb); 2131 *sizep = size; 2132 } else { 2133 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2134 PROC_LOCK(p); 2135 kern_proc_vmmap_out(p, sb, *sizep - sizeof(structsize), 2136 vmmap_flags); 2137 } 2138 } 2139 2140 static void 2141 note_procstat_groups(void *arg, struct sbuf *sb, size_t *sizep) 2142 { 2143 struct proc *p; 2144 size_t size; 2145 int structsize; 2146 2147 p = (struct proc *)arg; 2148 size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t); 2149 if (sb != NULL) { 2150 KASSERT(*sizep == size, ("invalid size")); 2151 structsize = sizeof(gid_t); 2152 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2153 sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups * 2154 sizeof(gid_t)); 2155 } 2156 *sizep = size; 2157 } 2158 2159 static void 2160 note_procstat_umask(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 size = sizeof(structsize) + sizeof(p->p_fd->fd_cmask); 2168 if (sb != NULL) { 2169 KASSERT(*sizep == size, ("invalid size")); 2170 structsize = sizeof(p->p_fd->fd_cmask); 2171 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2172 sbuf_bcat(sb, &p->p_fd->fd_cmask, sizeof(p->p_fd->fd_cmask)); 2173 } 2174 *sizep = size; 2175 } 2176 2177 static void 2178 note_procstat_rlimit(void *arg, struct sbuf *sb, size_t *sizep) 2179 { 2180 struct proc *p; 2181 struct rlimit rlim[RLIM_NLIMITS]; 2182 size_t size; 2183 int structsize, i; 2184 2185 p = (struct proc *)arg; 2186 size = sizeof(structsize) + sizeof(rlim); 2187 if (sb != NULL) { 2188 KASSERT(*sizep == size, ("invalid size")); 2189 structsize = sizeof(rlim); 2190 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2191 PROC_LOCK(p); 2192 for (i = 0; i < RLIM_NLIMITS; i++) 2193 lim_rlimit_proc(p, i, &rlim[i]); 2194 PROC_UNLOCK(p); 2195 sbuf_bcat(sb, rlim, sizeof(rlim)); 2196 } 2197 *sizep = size; 2198 } 2199 2200 static void 2201 note_procstat_osrel(void *arg, struct sbuf *sb, size_t *sizep) 2202 { 2203 struct proc *p; 2204 size_t size; 2205 int structsize; 2206 2207 p = (struct proc *)arg; 2208 size = sizeof(structsize) + sizeof(p->p_osrel); 2209 if (sb != NULL) { 2210 KASSERT(*sizep == size, ("invalid size")); 2211 structsize = sizeof(p->p_osrel); 2212 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2213 sbuf_bcat(sb, &p->p_osrel, sizeof(p->p_osrel)); 2214 } 2215 *sizep = size; 2216 } 2217 2218 static void 2219 __elfN(note_procstat_psstrings)(void *arg, struct sbuf *sb, size_t *sizep) 2220 { 2221 struct proc *p; 2222 elf_ps_strings_t ps_strings; 2223 size_t size; 2224 int structsize; 2225 2226 p = (struct proc *)arg; 2227 size = sizeof(structsize) + sizeof(ps_strings); 2228 if (sb != NULL) { 2229 KASSERT(*sizep == size, ("invalid size")); 2230 structsize = sizeof(ps_strings); 2231 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2232 ps_strings = PTROUT(p->p_sysent->sv_psstrings); 2233 #else 2234 ps_strings = p->p_sysent->sv_psstrings; 2235 #endif 2236 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2237 sbuf_bcat(sb, &ps_strings, sizeof(ps_strings)); 2238 } 2239 *sizep = size; 2240 } 2241 2242 static void 2243 __elfN(note_procstat_auxv)(void *arg, struct sbuf *sb, size_t *sizep) 2244 { 2245 struct proc *p; 2246 size_t size; 2247 int structsize; 2248 2249 p = (struct proc *)arg; 2250 if (sb == NULL) { 2251 size = 0; 2252 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2253 sbuf_set_drain(sb, sbuf_drain_count, &size); 2254 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2255 PHOLD(p); 2256 proc_getauxv(curthread, p, sb); 2257 PRELE(p); 2258 sbuf_finish(sb); 2259 sbuf_delete(sb); 2260 *sizep = size; 2261 } else { 2262 structsize = sizeof(Elf_Auxinfo); 2263 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2264 PHOLD(p); 2265 proc_getauxv(curthread, p, sb); 2266 PRELE(p); 2267 } 2268 } 2269 2270 static boolean_t 2271 __elfN(parse_notes)(struct image_params *imgp, Elf_Brandnote *checknote, 2272 int32_t *osrel, const Elf_Phdr *pnote) 2273 { 2274 const Elf_Note *note, *note0, *note_end; 2275 const char *note_name; 2276 char *buf; 2277 int i, error; 2278 boolean_t res; 2279 2280 /* We need some limit, might as well use PAGE_SIZE. */ 2281 if (pnote == NULL || pnote->p_filesz > PAGE_SIZE) 2282 return (FALSE); 2283 ASSERT_VOP_LOCKED(imgp->vp, "parse_notes"); 2284 if (pnote->p_offset > PAGE_SIZE || 2285 pnote->p_filesz > PAGE_SIZE - pnote->p_offset) { 2286 VOP_UNLOCK(imgp->vp, 0); 2287 buf = malloc(pnote->p_filesz, M_TEMP, M_WAITOK); 2288 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 2289 error = vn_rdwr(UIO_READ, imgp->vp, buf, pnote->p_filesz, 2290 pnote->p_offset, UIO_SYSSPACE, IO_NODELOCKED, 2291 curthread->td_ucred, NOCRED, NULL, curthread); 2292 if (error != 0) { 2293 uprintf("i/o error PT_NOTE\n"); 2294 res = FALSE; 2295 goto ret; 2296 } 2297 note = note0 = (const Elf_Note *)buf; 2298 note_end = (const Elf_Note *)(buf + pnote->p_filesz); 2299 } else { 2300 note = note0 = (const Elf_Note *)(imgp->image_header + 2301 pnote->p_offset); 2302 note_end = (const Elf_Note *)(imgp->image_header + 2303 pnote->p_offset + pnote->p_filesz); 2304 buf = NULL; 2305 } 2306 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) { 2307 if (!aligned(note, Elf32_Addr) || (const char *)note_end - 2308 (const char *)note < sizeof(Elf_Note)) { 2309 res = FALSE; 2310 goto ret; 2311 } 2312 if (note->n_namesz != checknote->hdr.n_namesz || 2313 note->n_descsz != checknote->hdr.n_descsz || 2314 note->n_type != checknote->hdr.n_type) 2315 goto nextnote; 2316 note_name = (const char *)(note + 1); 2317 if (note_name + checknote->hdr.n_namesz >= 2318 (const char *)note_end || strncmp(checknote->vendor, 2319 note_name, checknote->hdr.n_namesz) != 0) 2320 goto nextnote; 2321 2322 /* 2323 * Fetch the osreldate for binary 2324 * from the ELF OSABI-note if necessary. 2325 */ 2326 if ((checknote->flags & BN_TRANSLATE_OSREL) != 0 && 2327 checknote->trans_osrel != NULL) { 2328 res = checknote->trans_osrel(note, osrel); 2329 goto ret; 2330 } 2331 res = TRUE; 2332 goto ret; 2333 nextnote: 2334 note = (const Elf_Note *)((const char *)(note + 1) + 2335 roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) + 2336 roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE)); 2337 } 2338 res = FALSE; 2339 ret: 2340 free(buf, M_TEMP); 2341 return (res); 2342 } 2343 2344 /* 2345 * Try to find the appropriate ABI-note section for checknote, 2346 * fetch the osreldate for binary from the ELF OSABI-note. Only the 2347 * first page of the image is searched, the same as for headers. 2348 */ 2349 static boolean_t 2350 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote, 2351 int32_t *osrel) 2352 { 2353 const Elf_Phdr *phdr; 2354 const Elf_Ehdr *hdr; 2355 int i; 2356 2357 hdr = (const Elf_Ehdr *)imgp->image_header; 2358 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 2359 2360 for (i = 0; i < hdr->e_phnum; i++) { 2361 if (phdr[i].p_type == PT_NOTE && 2362 __elfN(parse_notes)(imgp, checknote, osrel, &phdr[i])) 2363 return (TRUE); 2364 } 2365 return (FALSE); 2366 2367 } 2368 2369 /* 2370 * Tell kern_execve.c about it, with a little help from the linker. 2371 */ 2372 static struct execsw __elfN(execsw) = { 2373 __CONCAT(exec_, __elfN(imgact)), 2374 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) 2375 }; 2376 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw)); 2377 2378 static vm_prot_t 2379 __elfN(trans_prot)(Elf_Word flags) 2380 { 2381 vm_prot_t prot; 2382 2383 prot = 0; 2384 if (flags & PF_X) 2385 prot |= VM_PROT_EXECUTE; 2386 if (flags & PF_W) 2387 prot |= VM_PROT_WRITE; 2388 if (flags & PF_R) 2389 prot |= VM_PROT_READ; 2390 #if __ELF_WORD_SIZE == 32 2391 #if defined(__amd64__) 2392 if (i386_read_exec && (flags & PF_R)) 2393 prot |= VM_PROT_EXECUTE; 2394 #endif 2395 #endif 2396 return (prot); 2397 } 2398 2399 static Elf_Word 2400 __elfN(untrans_prot)(vm_prot_t prot) 2401 { 2402 Elf_Word flags; 2403 2404 flags = 0; 2405 if (prot & VM_PROT_EXECUTE) 2406 flags |= PF_X; 2407 if (prot & VM_PROT_READ) 2408 flags |= PF_R; 2409 if (prot & VM_PROT_WRITE) 2410 flags |= PF_W; 2411 return (flags); 2412 } 2413