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