1/* 2 * Copyright (c) 2000-2010 Apple Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28/* 29 * Copyright (C) 1988, 1989, NeXT, Inc. 30 * 31 * File: kern/mach_loader.c 32 * Author: Avadis Tevanian, Jr. 33 * 34 * Mach object file loader (kernel version, for now). 35 * 36 * 21-Jul-88 Avadis Tevanian, Jr. (avie) at NeXT 37 * Started. 38 */ 39 40#include <sys/param.h> 41#include <sys/vnode_internal.h> 42#include <sys/uio.h> 43#include <sys/namei.h> 44#include <sys/proc_internal.h> 45#include <sys/kauth.h> 46#include <sys/stat.h> 47#include <sys/malloc.h> 48#include <sys/mount_internal.h> 49#include <sys/fcntl.h> 50#include <sys/ubc_internal.h> 51#include <sys/imgact.h> 52#include <sys/codesign.h> 53 54#include <mach/mach_types.h> 55#include <mach/vm_map.h> /* vm_allocate() */ 56#include <mach/mach_vm.h> /* mach_vm_allocate() */ 57#include <mach/vm_statistics.h> 58#include <mach/task.h> 59#include <mach/thread_act.h> 60 61#include <machine/vmparam.h> 62#include <machine/exec.h> 63#include <machine/pal_routines.h> 64 65#include <kern/kern_types.h> 66#include <kern/cpu_number.h> 67#include <kern/mach_loader.h> 68#include <kern/mach_fat.h> 69#include <kern/kalloc.h> 70#include <kern/task.h> 71#include <kern/thread.h> 72#include <kern/page_decrypt.h> 73 74#include <mach-o/fat.h> 75#include <mach-o/loader.h> 76 77#include <vm/pmap.h> 78#include <vm/vm_map.h> 79#include <vm/vm_kern.h> 80#include <vm/vm_pager.h> 81#include <vm/vnode_pager.h> 82#include <vm/vm_protos.h> 83#include <IOKit/IOReturn.h> /* for kIOReturnNotPrivileged */ 84 85/* 86 * XXX vm/pmap.h should not treat these prototypes as MACH_KERNEL_PRIVATE 87 * when KERNEL is defined. 88 */ 89extern pmap_t pmap_create(ledger_t ledger, vm_map_size_t size, 90 boolean_t is_64bit); 91 92/* XXX should have prototypes in a shared header file */ 93extern int get_map_nentries(vm_map_t); 94 95extern kern_return_t memory_object_signed(memory_object_control_t control, 96 boolean_t is_signed); 97 98/* An empty load_result_t */ 99static load_result_t load_result_null = { 100 .mach_header = MACH_VM_MIN_ADDRESS, 101 .entry_point = MACH_VM_MIN_ADDRESS, 102 .user_stack = MACH_VM_MIN_ADDRESS, 103 .user_stack_size = 0, 104 .all_image_info_addr = MACH_VM_MIN_ADDRESS, 105 .all_image_info_size = 0, 106 .thread_count = 0, 107 .unixproc = 0, 108 .dynlinker = 0, 109 .needs_dynlinker = 0, 110 .prog_allocated_stack = 0, 111 .prog_stack_size = 0, 112 .validentry = 0, 113 .csflags = 0, 114 .uuid = { 0 }, 115 .min_vm_addr = MACH_VM_MAX_ADDRESS, 116 .max_vm_addr = MACH_VM_MIN_ADDRESS 117}; 118 119/* 120 * Prototypes of static functions. 121 */ 122static load_return_t 123parse_machfile( 124 struct vnode *vp, 125 vm_map_t map, 126 thread_t thread, 127 struct mach_header *header, 128 off_t file_offset, 129 off_t macho_size, 130 int depth, 131 int64_t slide, 132 int64_t dyld_slide, 133 load_result_t *result 134); 135 136static load_return_t 137load_segment( 138 struct load_command *lcp, 139 uint32_t filetype, 140 void *control, 141 off_t pager_offset, 142 off_t macho_size, 143 struct vnode *vp, 144 vm_map_t map, 145 int64_t slide, 146 load_result_t *result 147); 148 149static load_return_t 150load_uuid( 151 struct uuid_command *uulp, 152 char *command_end, 153 load_result_t *result 154); 155 156static load_return_t 157load_code_signature( 158 struct linkedit_data_command *lcp, 159 struct vnode *vp, 160 off_t macho_offset, 161 off_t macho_size, 162 cpu_type_t cputype, 163 load_result_t *result); 164 165#if CONFIG_CODE_DECRYPTION 166static load_return_t 167set_code_unprotect( 168 struct encryption_info_command *lcp, 169 caddr_t addr, 170 vm_map_t map, 171 int64_t slide, 172 struct vnode *vp, 173 cpu_type_t cputype, 174 cpu_subtype_t cpusubtype); 175#endif 176 177static 178load_return_t 179load_main( 180 struct entry_point_command *epc, 181 thread_t thread, 182 int64_t slide, 183 load_result_t *result 184); 185 186static load_return_t 187load_unixthread( 188 struct thread_command *tcp, 189 thread_t thread, 190 int64_t slide, 191 load_result_t *result 192); 193 194static load_return_t 195load_threadstate( 196 thread_t thread, 197 uint32_t *ts, 198 uint32_t total_size 199); 200 201static load_return_t 202load_threadstack( 203 thread_t thread, 204 uint32_t *ts, 205 uint32_t total_size, 206 mach_vm_offset_t *user_stack, 207 int *customstack 208); 209 210static load_return_t 211load_threadentry( 212 thread_t thread, 213 uint32_t *ts, 214 uint32_t total_size, 215 mach_vm_offset_t *entry_point 216); 217 218static load_return_t 219load_dylinker( 220 struct dylinker_command *lcp, 221 integer_t archbits, 222 vm_map_t map, 223 thread_t thread, 224 int depth, 225 int64_t slide, 226 load_result_t *result 227); 228 229struct macho_data; 230 231static load_return_t 232get_macho_vnode( 233 char *path, 234 integer_t archbits, 235 struct mach_header *mach_header, 236 off_t *file_offset, 237 off_t *macho_size, 238 struct macho_data *macho_data, 239 struct vnode **vpp 240); 241 242static inline void 243widen_segment_command(const struct segment_command *scp32, 244 struct segment_command_64 *scp) 245{ 246 scp->cmd = scp32->cmd; 247 scp->cmdsize = scp32->cmdsize; 248 bcopy(scp32->segname, scp->segname, sizeof(scp->segname)); 249 scp->vmaddr = scp32->vmaddr; 250 scp->vmsize = scp32->vmsize; 251 scp->fileoff = scp32->fileoff; 252 scp->filesize = scp32->filesize; 253 scp->maxprot = scp32->maxprot; 254 scp->initprot = scp32->initprot; 255 scp->nsects = scp32->nsects; 256 scp->flags = scp32->flags; 257} 258 259static void 260note_all_image_info_section(const struct segment_command_64 *scp, 261 boolean_t is64, size_t section_size, const void *sections, 262 int64_t slide, load_result_t *result) 263{ 264 const union { 265 struct section s32; 266 struct section_64 s64; 267 } *sectionp; 268 unsigned int i; 269 270 if (strncmp(scp->segname, "__DATA", sizeof(scp->segname)) != 0) 271 return; 272 for (i = 0; i < scp->nsects; ++i) { 273 sectionp = (const void *) 274 ((const char *)sections + section_size * i); 275 if (0 == strncmp(sectionp->s64.sectname, "__all_image_info", 276 sizeof(sectionp->s64.sectname))) { 277 result->all_image_info_addr = 278 is64 ? sectionp->s64.addr : sectionp->s32.addr; 279 result->all_image_info_addr += slide; 280 result->all_image_info_size = 281 is64 ? sectionp->s64.size : sectionp->s32.size; 282 return; 283 } 284 } 285} 286 287load_return_t 288load_machfile( 289 struct image_params *imgp, 290 struct mach_header *header, 291 thread_t thread, 292 vm_map_t new_map, 293 load_result_t *result 294) 295{ 296 struct vnode *vp = imgp->ip_vp; 297 off_t file_offset = imgp->ip_arch_offset; 298 off_t macho_size = imgp->ip_arch_size; 299 off_t file_size = imgp->ip_vattr->va_data_size; 300 301 pmap_t pmap = 0; /* protected by create_map */ 302 vm_map_t map; 303 vm_map_t old_map; 304 task_t old_task = TASK_NULL; /* protected by create_map */ 305 load_result_t myresult; 306 load_return_t lret; 307 boolean_t create_map = FALSE; 308 boolean_t enforce_hard_pagezero = TRUE; 309 int spawn = (imgp->ip_flags & IMGPF_SPAWN); 310 task_t task = current_task(); 311 proc_t p = current_proc(); 312 mach_vm_offset_t aslr_offset = 0; 313 mach_vm_offset_t dyld_aslr_offset = 0; 314 kern_return_t kret; 315 316 if (macho_size > file_size) { 317 return(LOAD_BADMACHO); 318 } 319 320 if (new_map == VM_MAP_NULL) { 321 create_map = TRUE; 322 old_task = current_task(); 323 } 324 325 /* 326 * If we are spawning, we have created backing objects for the process 327 * already, which include non-lazily creating the task map. So we 328 * are going to switch out the task map with one appropriate for the 329 * bitness of the image being loaded. 330 */ 331 if (spawn) { 332 create_map = TRUE; 333 old_task = get_threadtask(thread); 334 } 335 336 if (create_map) { 337 task_t ledger_task; 338 if (imgp->ip_new_thread) { 339 ledger_task = get_threadtask(imgp->ip_new_thread); 340 } else { 341 ledger_task = task; 342 } 343 pmap = pmap_create(get_task_ledger(ledger_task), 344 (vm_map_size_t) 0, 345 (imgp->ip_flags & IMGPF_IS_64BIT)); 346 pal_switch_pmap(thread, pmap, imgp->ip_flags & IMGPF_IS_64BIT); 347 map = vm_map_create(pmap, 348 0, 349 vm_compute_max_offset((imgp->ip_flags & IMGPF_IS_64BIT)), 350 TRUE); 351 } else 352 map = new_map; 353 354 355#ifndef CONFIG_ENFORCE_SIGNED_CODE 356 /* This turns off faulting for executable pages, which allows 357 * to circumvent Code Signing Enforcement. The per process 358 * flag (CS_ENFORCEMENT) is not set yet, but we can use the 359 * global flag. 360 */ 361 if ( !cs_enforcement(NULL) && (header->flags & MH_ALLOW_STACK_EXECUTION) ) 362 vm_map_disable_NX(map); 363#endif 364 365 /* Forcibly disallow execution from data pages on even if the arch 366 * normally permits it. */ 367 if ((header->flags & MH_NO_HEAP_EXECUTION) && !(imgp->ip_flags & IMGPF_ALLOW_DATA_EXEC)) 368 vm_map_disallow_data_exec(map); 369 370 /* 371 * Compute a random offset for ASLR, and an independent random offset for dyld. 372 */ 373 if (!(imgp->ip_flags & IMGPF_DISABLE_ASLR)) { 374 uint64_t max_slide_pages; 375 376 max_slide_pages = vm_map_get_max_aslr_slide_pages(map); 377 378 aslr_offset = random(); 379 aslr_offset %= max_slide_pages; 380 aslr_offset <<= vm_map_page_shift(map); 381 382 dyld_aslr_offset = random(); 383 dyld_aslr_offset %= max_slide_pages; 384 dyld_aslr_offset <<= vm_map_page_shift(map); 385 } 386 387 if (!result) 388 result = &myresult; 389 390 *result = load_result_null; 391 392 lret = parse_machfile(vp, map, thread, header, file_offset, macho_size, 393 0, (int64_t)aslr_offset, (int64_t)dyld_aslr_offset, result); 394 395 if (lret != LOAD_SUCCESS) { 396 if (create_map) { 397 vm_map_deallocate(map); /* will lose pmap reference too */ 398 } 399 return(lret); 400 } 401 402#if __x86_64__ 403 /* 404 * On x86, for compatibility, don't enforce the hard page-zero restriction for 32-bit binaries. 405 */ 406 if ((imgp->ip_flags & IMGPF_IS_64BIT) == 0) { 407 enforce_hard_pagezero = FALSE; 408 } 409#endif 410 /* 411 * Check to see if the page zero is enforced by the map->min_offset. 412 */ 413 if (enforce_hard_pagezero && (vm_map_has_hard_pagezero(map, 0x1000) == FALSE)) { 414 if (create_map) { 415 vm_map_deallocate(map); /* will lose pmap reference too */ 416 } 417 printf("Cannot enforce a hard page-zero for %s\n", imgp->ip_strings); 418 return (LOAD_BADMACHO); 419 } 420 421 /* 422 * Commit to new map. 423 * 424 * Swap the new map for the old, which consumes our new map 425 * reference but each leaves us responsible for the old_map reference. 426 * That lets us get off the pmap associated with it, and 427 * then we can release it. 428 */ 429 430 if (create_map) { 431 /* 432 * If this is an exec, then we are going to destroy the old 433 * task, and it's correct to halt it; if it's spawn, the 434 * task is not yet running, and it makes no sense. 435 */ 436 if (!spawn) { 437 /* 438 * Mark the task as halting and start the other 439 * threads towards terminating themselves. Then 440 * make sure any threads waiting for a process 441 * transition get informed that we are committed to 442 * this transition, and then finally complete the 443 * task halting (wait for threads and then cleanup 444 * task resources). 445 * 446 * NOTE: task_start_halt() makes sure that no new 447 * threads are created in the task during the transition. 448 * We need to mark the workqueue as exiting before we 449 * wait for threads to terminate (at the end of which 450 * we no longer have a prohibition on thread creation). 451 * 452 * Finally, clean up any lingering workqueue data structures 453 * that may have been left behind by the workqueue threads 454 * as they exited (and then clean up the work queue itself). 455 */ 456 kret = task_start_halt(task); 457 if (kret != KERN_SUCCESS) { 458 vm_map_deallocate(map); /* will lose pmap reference too */ 459 return (LOAD_FAILURE); 460 } 461 proc_transcommit(p, 0); 462 workqueue_mark_exiting(p); 463 task_complete_halt(task); 464 workqueue_exit(p); 465 } 466 old_map = swap_task_map(old_task, thread, map, !spawn); 467 vm_map_deallocate(old_map); 468 } 469 return(LOAD_SUCCESS); 470} 471 472/* 473 * The file size of a mach-o file is limited to 32 bits; this is because 474 * this is the limit on the kalloc() of enough bytes for a mach_header and 475 * the contents of its sizeofcmds, which is currently constrained to 32 476 * bits in the file format itself. We read into the kernel buffer the 477 * commands section, and then parse it in order to parse the mach-o file 478 * format load_command segment(s). We are only interested in a subset of 479 * the total set of possible commands. If "map"==VM_MAP_NULL or 480 * "thread"==THREAD_NULL, do not make permament VM modifications, 481 * just preflight the parse. 482 */ 483static 484load_return_t 485parse_machfile( 486 struct vnode *vp, 487 vm_map_t map, 488 thread_t thread, 489 struct mach_header *header, 490 off_t file_offset, 491 off_t macho_size, 492 int depth, 493 int64_t aslr_offset, 494 int64_t dyld_aslr_offset, 495 load_result_t *result 496) 497{ 498 uint32_t ncmds; 499 struct load_command *lcp; 500 struct dylinker_command *dlp = 0; 501 integer_t dlarchbits = 0; 502 void * control; 503 load_return_t ret = LOAD_SUCCESS; 504 caddr_t addr; 505 void * kl_addr; 506 vm_size_t size,kl_size; 507 size_t offset; 508 size_t oldoffset; /* for overflow check */ 509 int pass; 510 proc_t p = current_proc(); /* XXXX */ 511 int error; 512 int resid=0; 513 size_t mach_header_sz = sizeof(struct mach_header); 514 boolean_t abi64; 515 boolean_t got_code_signatures = FALSE; 516 int64_t slide = 0; 517 518 if (header->magic == MH_MAGIC_64 || 519 header->magic == MH_CIGAM_64) { 520 mach_header_sz = sizeof(struct mach_header_64); 521 } 522 523 /* 524 * Break infinite recursion 525 */ 526 if (depth > 6) { 527 return(LOAD_FAILURE); 528 } 529 530 depth++; 531 532 /* 533 * Check to see if right machine type. 534 */ 535 if (((cpu_type_t)(header->cputype & ~CPU_ARCH_MASK) != (cpu_type() & ~CPU_ARCH_MASK)) || 536 !grade_binary(header->cputype, 537 header->cpusubtype & ~CPU_SUBTYPE_MASK)) 538 return(LOAD_BADARCH); 539 540 abi64 = ((header->cputype & CPU_ARCH_ABI64) == CPU_ARCH_ABI64); 541 542 switch (header->filetype) { 543 544 case MH_OBJECT: 545 case MH_EXECUTE: 546 case MH_PRELOAD: 547 if (depth != 1) { 548 return (LOAD_FAILURE); 549 } 550 break; 551 552 case MH_FVMLIB: 553 case MH_DYLIB: 554 if (depth == 1) { 555 return (LOAD_FAILURE); 556 } 557 break; 558 559 case MH_DYLINKER: 560 if (depth != 2) { 561 return (LOAD_FAILURE); 562 } 563 break; 564 565 default: 566 return (LOAD_FAILURE); 567 } 568 569 /* 570 * Get the pager for the file. 571 */ 572 control = ubc_getobject(vp, UBC_FLAGS_NONE); 573 574 /* 575 * Map portion that must be accessible directly into 576 * kernel's map. 577 */ 578 if ((off_t)(mach_header_sz + header->sizeofcmds) > macho_size) 579 return(LOAD_BADMACHO); 580 581 /* 582 * Round size of Mach-O commands up to page boundry. 583 */ 584 size = round_page(mach_header_sz + header->sizeofcmds); 585 if (size <= 0) 586 return(LOAD_BADMACHO); 587 588 /* 589 * Map the load commands into kernel memory. 590 */ 591 addr = 0; 592 kl_size = size; 593 kl_addr = kalloc(size); 594 addr = (caddr_t)kl_addr; 595 if (addr == NULL) 596 return(LOAD_NOSPACE); 597 598 error = vn_rdwr(UIO_READ, vp, addr, size, file_offset, 599 UIO_SYSSPACE, 0, kauth_cred_get(), &resid, p); 600 if (error) { 601 if (kl_addr ) 602 kfree(kl_addr, kl_size); 603 return(LOAD_IOERROR); 604 } 605 606 /* 607 * For PIE and dyld, slide everything by the ASLR offset. 608 */ 609 if ((header->flags & MH_PIE) || (header->filetype == MH_DYLINKER)) { 610 slide = aslr_offset; 611 } 612 613 /* 614 * Scan through the commands, processing each one as necessary. 615 * We parse in three passes through the headers: 616 * 1: thread state, uuid, code signature 617 * 2: segments 618 * 3: dyld, encryption, check entry point 619 */ 620 621 for (pass = 1; pass <= 3; pass++) { 622 623 /* 624 * Check that the entry point is contained in an executable segments 625 */ 626 if ((pass == 3) && (result->validentry == 0)) { 627 thread_state_initialize(thread); 628 ret = LOAD_FAILURE; 629 break; 630 } 631 632 /* 633 * Loop through each of the load_commands indicated by the 634 * Mach-O header; if an absurd value is provided, we just 635 * run off the end of the reserved section by incrementing 636 * the offset too far, so we are implicitly fail-safe. 637 */ 638 offset = mach_header_sz; 639 ncmds = header->ncmds; 640 641 while (ncmds--) { 642 /* 643 * Get a pointer to the command. 644 */ 645 lcp = (struct load_command *)(addr + offset); 646 oldoffset = offset; 647 offset += lcp->cmdsize; 648 649 /* 650 * Perform prevalidation of the struct load_command 651 * before we attempt to use its contents. Invalid 652 * values are ones which result in an overflow, or 653 * which can not possibly be valid commands, or which 654 * straddle or exist past the reserved section at the 655 * start of the image. 656 */ 657 if (oldoffset > offset || 658 lcp->cmdsize < sizeof(struct load_command) || 659 offset > header->sizeofcmds + mach_header_sz) { 660 ret = LOAD_BADMACHO; 661 break; 662 } 663 664 /* 665 * Act on struct load_command's for which kernel 666 * intervention is required. 667 */ 668 switch(lcp->cmd) { 669 case LC_SEGMENT: 670 if (pass != 2) 671 break; 672 673 if (abi64) { 674 /* 675 * Having an LC_SEGMENT command for the 676 * wrong ABI is invalid <rdar://problem/11021230> 677 */ 678 ret = LOAD_BADMACHO; 679 break; 680 } 681 682 ret = load_segment(lcp, 683 header->filetype, 684 control, 685 file_offset, 686 macho_size, 687 vp, 688 map, 689 slide, 690 result); 691 break; 692 case LC_SEGMENT_64: 693 if (pass != 2) 694 break; 695 696 if (!abi64) { 697 /* 698 * Having an LC_SEGMENT_64 command for the 699 * wrong ABI is invalid <rdar://problem/11021230> 700 */ 701 ret = LOAD_BADMACHO; 702 break; 703 } 704 705 ret = load_segment(lcp, 706 header->filetype, 707 control, 708 file_offset, 709 macho_size, 710 vp, 711 map, 712 slide, 713 result); 714 break; 715 case LC_UNIXTHREAD: 716 if (pass != 1) 717 break; 718 ret = load_unixthread( 719 (struct thread_command *) lcp, 720 thread, 721 slide, 722 result); 723 break; 724 case LC_MAIN: 725 if (pass != 1) 726 break; 727 if (depth != 1) 728 break; 729 ret = load_main( 730 (struct entry_point_command *) lcp, 731 thread, 732 slide, 733 result); 734 break; 735 case LC_LOAD_DYLINKER: 736 if (pass != 3) 737 break; 738 if ((depth == 1) && (dlp == 0)) { 739 dlp = (struct dylinker_command *)lcp; 740 dlarchbits = (header->cputype & CPU_ARCH_MASK); 741 } else { 742 ret = LOAD_FAILURE; 743 } 744 break; 745 case LC_UUID: 746 if (pass == 1 && depth == 1) { 747 ret = load_uuid((struct uuid_command *) lcp, 748 (char *)addr + mach_header_sz + header->sizeofcmds, 749 result); 750 } 751 break; 752 case LC_CODE_SIGNATURE: 753 /* CODE SIGNING */ 754 if (pass != 1) 755 break; 756 /* pager -> uip -> 757 load signatures & store in uip 758 set VM object "signed_pages" 759 */ 760 ret = load_code_signature( 761 (struct linkedit_data_command *) lcp, 762 vp, 763 file_offset, 764 macho_size, 765 header->cputype, 766 result); 767 if (ret != LOAD_SUCCESS) { 768 printf("proc %d: load code signature error %d " 769 "for file \"%s\"\n", 770 p->p_pid, ret, vp->v_name); 771 ret = LOAD_SUCCESS; /* ignore error */ 772 } else { 773 got_code_signatures = TRUE; 774 } 775 break; 776#if CONFIG_CODE_DECRYPTION 777 case LC_ENCRYPTION_INFO: 778 case LC_ENCRYPTION_INFO_64: 779 if (pass != 3) 780 break; 781 ret = set_code_unprotect( 782 (struct encryption_info_command *) lcp, 783 addr, map, slide, vp, 784 header->cputype, header->cpusubtype); 785 if (ret != LOAD_SUCCESS) { 786 printf("proc %d: set_code_unprotect() error %d " 787 "for file \"%s\"\n", 788 p->p_pid, ret, vp->v_name); 789 /* 790 * Don't let the app run if it's 791 * encrypted but we failed to set up the 792 * decrypter. If the keys are missing it will 793 * return LOAD_DECRYPTFAIL. 794 */ 795 if (ret == LOAD_DECRYPTFAIL) { 796 /* failed to load due to missing FP keys */ 797 proc_lock(p); 798 p->p_lflag |= P_LTERM_DECRYPTFAIL; 799 proc_unlock(p); 800 } 801 psignal(p, SIGKILL); 802 } 803 break; 804#endif 805 default: 806 /* Other commands are ignored by the kernel */ 807 ret = LOAD_SUCCESS; 808 break; 809 } 810 if (ret != LOAD_SUCCESS) 811 break; 812 } 813 if (ret != LOAD_SUCCESS) 814 break; 815 } 816 817 if (ret == LOAD_SUCCESS) { 818 if (! got_code_signatures) { 819 struct cs_blob *blob; 820 /* no embedded signatures: look for detached ones */ 821 blob = ubc_cs_blob_get(vp, -1, file_offset); 822 if (blob != NULL) { 823 unsigned int cs_flag_data = blob->csb_flags; 824 if(0 != ubc_cs_generation_check(vp)) { 825 if (0 != ubc_cs_blob_revalidate(vp, blob)) { 826 /* clear out the flag data if revalidation fails */ 827 cs_flag_data = 0; 828 result->csflags &= ~CS_VALID; 829 } 830 } 831 /* get flags to be applied to the process */ 832 result->csflags |= cs_flag_data; 833 } 834 } 835 836 /* Make sure if we need dyld, we got it */ 837 if (result->needs_dynlinker && !dlp) { 838 ret = LOAD_FAILURE; 839 } 840 841 if ((ret == LOAD_SUCCESS) && (dlp != 0)) { 842 /* 843 * load the dylinker, and slide it by the independent DYLD ASLR 844 * offset regardless of the PIE-ness of the main binary. 845 */ 846 ret = load_dylinker(dlp, dlarchbits, map, thread, depth, 847 dyld_aslr_offset, result); 848 } 849 850 if((ret == LOAD_SUCCESS) && (depth == 1)) { 851 if (result->thread_count == 0) { 852 ret = LOAD_FAILURE; 853 } 854 } 855 } 856 857 if (kl_addr ) 858 kfree(kl_addr, kl_size); 859 860 return(ret); 861} 862 863#if CONFIG_CODE_DECRYPTION 864 865#define APPLE_UNPROTECTED_HEADER_SIZE (3 * PAGE_SIZE_64) 866 867static load_return_t 868unprotect_dsmos_segment( 869 uint64_t file_off, 870 uint64_t file_size, 871 struct vnode *vp, 872 off_t macho_offset, 873 vm_map_t map, 874 vm_map_offset_t map_addr, 875 vm_map_size_t map_size) 876{ 877 kern_return_t kr; 878 879 /* 880 * The first APPLE_UNPROTECTED_HEADER_SIZE bytes (from offset 0 of 881 * this part of a Universal binary) are not protected... 882 * The rest needs to be "transformed". 883 */ 884 if (file_off <= APPLE_UNPROTECTED_HEADER_SIZE && 885 file_off + file_size <= APPLE_UNPROTECTED_HEADER_SIZE) { 886 /* it's all unprotected, nothing to do... */ 887 kr = KERN_SUCCESS; 888 } else { 889 if (file_off <= APPLE_UNPROTECTED_HEADER_SIZE) { 890 /* 891 * We start mapping in the unprotected area. 892 * Skip the unprotected part... 893 */ 894 vm_map_offset_t delta; 895 896 delta = APPLE_UNPROTECTED_HEADER_SIZE; 897 delta -= file_off; 898 map_addr += delta; 899 map_size -= delta; 900 } 901 /* ... transform the rest of the mapping. */ 902 struct pager_crypt_info crypt_info; 903 crypt_info.page_decrypt = dsmos_page_transform; 904 crypt_info.crypt_ops = NULL; 905 crypt_info.crypt_end = NULL; 906#pragma unused(vp, macho_offset) 907 crypt_info.crypt_ops = (void *)0x2e69cf40; 908 kr = vm_map_apple_protected(map, 909 map_addr, 910 map_addr + map_size, 911 &crypt_info); 912 } 913 914 if (kr != KERN_SUCCESS) { 915 return LOAD_FAILURE; 916 } 917 return LOAD_SUCCESS; 918} 919#else /* CONFIG_CODE_DECRYPTION */ 920static load_return_t 921unprotect_dsmos_segment( 922 __unused uint64_t file_off, 923 __unused uint64_t file_size, 924 __unused struct vnode *vp, 925 __unused off_t macho_offset, 926 __unused vm_map_t map, 927 __unused vm_map_offset_t map_addr, 928 __unused vm_map_size_t map_size) 929{ 930 return LOAD_SUCCESS; 931} 932#endif /* CONFIG_CODE_DECRYPTION */ 933 934static 935load_return_t 936load_segment( 937 struct load_command *lcp, 938 uint32_t filetype, 939 void * control, 940 off_t pager_offset, 941 off_t macho_size, 942 struct vnode *vp, 943 vm_map_t map, 944 int64_t slide, 945 load_result_t *result 946) 947{ 948 struct segment_command_64 segment_command, *scp; 949 kern_return_t ret; 950 vm_map_offset_t map_addr, map_offset; 951 vm_map_size_t map_size, seg_size, delta_size; 952 vm_prot_t initprot; 953 vm_prot_t maxprot; 954 size_t segment_command_size, total_section_size, 955 single_section_size; 956 957 if (LC_SEGMENT_64 == lcp->cmd) { 958 segment_command_size = sizeof(struct segment_command_64); 959 single_section_size = sizeof(struct section_64); 960 } else { 961 segment_command_size = sizeof(struct segment_command); 962 single_section_size = sizeof(struct section); 963 } 964 if (lcp->cmdsize < segment_command_size) 965 return (LOAD_BADMACHO); 966 total_section_size = lcp->cmdsize - segment_command_size; 967 968 if (LC_SEGMENT_64 == lcp->cmd) 969 scp = (struct segment_command_64 *)lcp; 970 else { 971 scp = &segment_command; 972 widen_segment_command((struct segment_command *)lcp, scp); 973 } 974 975 /* 976 * Make sure what we get from the file is really ours (as specified 977 * by macho_size). 978 */ 979 if (scp->fileoff + scp->filesize < scp->fileoff || 980 scp->fileoff + scp->filesize > (uint64_t)macho_size) 981 return (LOAD_BADMACHO); 982 /* 983 * Ensure that the number of sections specified would fit 984 * within the load command size. 985 */ 986 if (total_section_size / single_section_size < scp->nsects) 987 return (LOAD_BADMACHO); 988 /* 989 * Make sure the segment is page-aligned in the file. 990 */ 991 if ((scp->fileoff & PAGE_MASK_64) != 0) 992 return (LOAD_BADMACHO); 993 994 /* 995 * Round sizes to page size. 996 */ 997 seg_size = round_page_64(scp->vmsize); 998 map_size = round_page_64(scp->filesize); 999 map_addr = trunc_page_64(scp->vmaddr); /* JVXXX note that in XNU TOT this is round instead of trunc for 64 bits */ 1000 1001 seg_size = vm_map_round_page(seg_size, vm_map_page_mask(map)); 1002 map_size = vm_map_round_page(map_size, vm_map_page_mask(map)); 1003 1004 if (seg_size == 0) 1005 return (KERN_SUCCESS); 1006 if (map_addr == 0 && 1007 map_size == 0 && 1008 seg_size != 0 && 1009 (scp->initprot & VM_PROT_ALL) == VM_PROT_NONE && 1010 (scp->maxprot & VM_PROT_ALL) == VM_PROT_NONE) { 1011 /* 1012 * For PIE, extend page zero rather than moving it. Extending 1013 * page zero keeps early allocations from falling predictably 1014 * between the end of page zero and the beginning of the first 1015 * slid segment. 1016 */ 1017 seg_size += slide; 1018 slide = 0; 1019 1020 /* 1021 * This is a "page zero" segment: it starts at address 0, 1022 * is not mapped from the binary file and is not accessible. 1023 * User-space should never be able to access that memory, so 1024 * make it completely off limits by raising the VM map's 1025 * minimum offset. 1026 */ 1027 ret = vm_map_raise_min_offset(map, seg_size); 1028 if (ret != KERN_SUCCESS) { 1029 return (LOAD_FAILURE); 1030 } 1031 return (LOAD_SUCCESS); 1032 } 1033 1034 /* If a non-zero slide was specified by the caller, apply now */ 1035 map_addr += slide; 1036 1037 if (map_addr < result->min_vm_addr) 1038 result->min_vm_addr = map_addr; 1039 if (map_addr+seg_size > result->max_vm_addr) 1040 result->max_vm_addr = map_addr+seg_size; 1041 1042 if (map == VM_MAP_NULL) 1043 return (LOAD_SUCCESS); 1044 1045 map_offset = pager_offset + scp->fileoff; /* limited to 32 bits */ 1046 1047 if (map_size > 0) { 1048 initprot = (scp->initprot) & VM_PROT_ALL; 1049 maxprot = (scp->maxprot) & VM_PROT_ALL; 1050 /* 1051 * Map a copy of the file into the address space. 1052 */ 1053 ret = vm_map_enter_mem_object_control(map, 1054 &map_addr, map_size, (mach_vm_offset_t)0, 1055 VM_FLAGS_FIXED, control, map_offset, TRUE, 1056 initprot, maxprot, 1057 VM_INHERIT_DEFAULT); 1058 if (ret != KERN_SUCCESS) { 1059 return (LOAD_NOSPACE); 1060 } 1061 1062 /* 1063 * If the file didn't end on a page boundary, 1064 * we need to zero the leftover. 1065 */ 1066 delta_size = map_size - scp->filesize; 1067#if FIXME 1068 if (delta_size > 0) { 1069 mach_vm_offset_t tmp; 1070 1071 ret = mach_vm_allocate(kernel_map, &tmp, delta_size, VM_FLAGS_ANYWHERE); 1072 if (ret != KERN_SUCCESS) 1073 return(LOAD_RESOURCE); 1074 1075 if (copyout(tmp, map_addr + scp->filesize, 1076 delta_size)) { 1077 (void) mach_vm_deallocate( 1078 kernel_map, tmp, delta_size); 1079 return (LOAD_FAILURE); 1080 } 1081 1082 (void) mach_vm_deallocate(kernel_map, tmp, delta_size); 1083 } 1084#endif /* FIXME */ 1085 } 1086 1087 /* 1088 * If the virtual size of the segment is greater 1089 * than the size from the file, we need to allocate 1090 * zero fill memory for the rest. 1091 */ 1092 delta_size = seg_size - map_size; 1093 if (delta_size > 0) { 1094 mach_vm_offset_t tmp = map_addr + map_size; 1095 1096 ret = mach_vm_map(map, &tmp, delta_size, 0, VM_FLAGS_FIXED, 1097 NULL, 0, FALSE, 1098 scp->initprot, scp->maxprot, 1099 VM_INHERIT_DEFAULT); 1100 if (ret != KERN_SUCCESS) 1101 return(LOAD_NOSPACE); 1102 } 1103 1104 if ( (scp->fileoff == 0) && (scp->filesize != 0) ) 1105 result->mach_header = map_addr; 1106 1107 if (scp->flags & SG_PROTECTED_VERSION_1) { 1108 ret = unprotect_dsmos_segment(scp->fileoff, 1109 scp->filesize, 1110 vp, 1111 pager_offset, 1112 map, 1113 map_addr, 1114 map_size); 1115 } else { 1116 ret = LOAD_SUCCESS; 1117 } 1118 if (LOAD_SUCCESS == ret && filetype == MH_DYLINKER && 1119 result->all_image_info_addr == MACH_VM_MIN_ADDRESS) 1120 note_all_image_info_section(scp, 1121 LC_SEGMENT_64 == lcp->cmd, single_section_size, 1122 (const char *)lcp + segment_command_size, slide, result); 1123 1124 if ((result->entry_point >= map_addr) && (result->entry_point < (map_addr + map_size))) 1125 result->validentry = 1; 1126 1127 return ret; 1128} 1129 1130static 1131load_return_t 1132load_uuid( 1133 struct uuid_command *uulp, 1134 char *command_end, 1135 load_result_t *result 1136) 1137{ 1138 /* 1139 * We need to check the following for this command: 1140 * - The command size should be atleast the size of struct uuid_command 1141 * - The UUID part of the command should be completely within the mach-o header 1142 */ 1143 1144 if ((uulp->cmdsize < sizeof(struct uuid_command)) || 1145 (((char *)uulp + sizeof(struct uuid_command)) > command_end)) { 1146 return (LOAD_BADMACHO); 1147 } 1148 1149 memcpy(&result->uuid[0], &uulp->uuid[0], sizeof(result->uuid)); 1150 return (LOAD_SUCCESS); 1151} 1152 1153static 1154load_return_t 1155load_main( 1156 struct entry_point_command *epc, 1157 thread_t thread, 1158 int64_t slide, 1159 load_result_t *result 1160) 1161{ 1162 mach_vm_offset_t addr; 1163 kern_return_t ret; 1164 1165 if (epc->cmdsize < sizeof(*epc)) 1166 return (LOAD_BADMACHO); 1167 if (result->thread_count != 0) { 1168 printf("load_main: already have a thread!"); 1169 return (LOAD_FAILURE); 1170 } 1171 1172 if (thread == THREAD_NULL) 1173 return (LOAD_SUCCESS); 1174 1175 /* LC_MAIN specifies stack size but not location */ 1176 if (epc->stacksize) { 1177 result->prog_stack_size = 1; 1178 result->user_stack_size = epc->stacksize; 1179 } else { 1180 result->prog_stack_size = 0; 1181 result->user_stack_size = MAXSSIZ; 1182 } 1183 result->prog_allocated_stack = 0; 1184 1185 /* use default location for stack */ 1186 ret = thread_userstackdefault(thread, &addr); 1187 if (ret != KERN_SUCCESS) 1188 return(LOAD_FAILURE); 1189 1190 /* The stack slides down from the default location */ 1191 result->user_stack = addr; 1192 result->user_stack -= slide; 1193 1194 /* kernel does *not* use entryoff from LC_MAIN. Dyld uses it. */ 1195 result->needs_dynlinker = TRUE; 1196 result->validentry = TRUE; 1197 1198 ret = thread_state_initialize( thread ); 1199 if (ret != KERN_SUCCESS) { 1200 return(LOAD_FAILURE); 1201 } 1202 1203 result->unixproc = TRUE; 1204 result->thread_count++; 1205 1206 return(LOAD_SUCCESS); 1207} 1208 1209 1210static 1211load_return_t 1212load_unixthread( 1213 struct thread_command *tcp, 1214 thread_t thread, 1215 int64_t slide, 1216 load_result_t *result 1217) 1218{ 1219 load_return_t ret; 1220 int customstack =0; 1221 mach_vm_offset_t addr; 1222 1223 if (tcp->cmdsize < sizeof(*tcp)) 1224 return (LOAD_BADMACHO); 1225 if (result->thread_count != 0) { 1226 printf("load_unixthread: already have a thread!"); 1227 return (LOAD_FAILURE); 1228 } 1229 1230 if (thread == THREAD_NULL) 1231 return (LOAD_SUCCESS); 1232 1233 ret = load_threadstack(thread, 1234 (uint32_t *)(((vm_offset_t)tcp) + 1235 sizeof(struct thread_command)), 1236 tcp->cmdsize - sizeof(struct thread_command), 1237 &addr, 1238 &customstack); 1239 if (ret != LOAD_SUCCESS) 1240 return(ret); 1241 1242 /* LC_UNIXTHREAD optionally specifies stack size and location */ 1243 1244 if (customstack) { 1245 result->prog_stack_size = 0; /* unknown */ 1246 result->prog_allocated_stack = 1; 1247 } else { 1248 result->prog_allocated_stack = 0; 1249 result->prog_stack_size = 0; 1250 result->user_stack_size = MAXSSIZ; 1251 } 1252 1253 /* The stack slides down from the default location */ 1254 result->user_stack = addr; 1255 result->user_stack -= slide; 1256 1257 ret = load_threadentry(thread, 1258 (uint32_t *)(((vm_offset_t)tcp) + 1259 sizeof(struct thread_command)), 1260 tcp->cmdsize - sizeof(struct thread_command), 1261 &addr); 1262 if (ret != LOAD_SUCCESS) 1263 return(ret); 1264 1265 result->entry_point = addr; 1266 result->entry_point += slide; 1267 1268 ret = load_threadstate(thread, 1269 (uint32_t *)(((vm_offset_t)tcp) + 1270 sizeof(struct thread_command)), 1271 tcp->cmdsize - sizeof(struct thread_command)); 1272 if (ret != LOAD_SUCCESS) 1273 return (ret); 1274 1275 result->unixproc = TRUE; 1276 result->thread_count++; 1277 1278 return(LOAD_SUCCESS); 1279} 1280 1281static 1282load_return_t 1283load_threadstate( 1284 thread_t thread, 1285 uint32_t *ts, 1286 uint32_t total_size 1287) 1288{ 1289 kern_return_t ret; 1290 uint32_t size; 1291 int flavor; 1292 uint32_t thread_size; 1293 1294 ret = thread_state_initialize( thread ); 1295 if (ret != KERN_SUCCESS) { 1296 return(LOAD_FAILURE); 1297 } 1298 1299 /* 1300 * Set the new thread state; iterate through the state flavors in 1301 * the mach-o file. 1302 */ 1303 while (total_size > 0) { 1304 flavor = *ts++; 1305 size = *ts++; 1306 if (UINT32_MAX-2 < size || 1307 UINT32_MAX/sizeof(uint32_t) < size+2) 1308 return (LOAD_BADMACHO); 1309 thread_size = (size+2)*sizeof(uint32_t); 1310 if (thread_size > total_size) 1311 return(LOAD_BADMACHO); 1312 total_size -= thread_size; 1313 /* 1314 * Third argument is a kernel space pointer; it gets cast 1315 * to the appropriate type in machine_thread_set_state() 1316 * based on the value of flavor. 1317 */ 1318 ret = thread_setstatus(thread, flavor, (thread_state_t)ts, size); 1319 if (ret != KERN_SUCCESS) { 1320 return(LOAD_FAILURE); 1321 } 1322 ts += size; /* ts is a (uint32_t *) */ 1323 } 1324 return(LOAD_SUCCESS); 1325} 1326 1327static 1328load_return_t 1329load_threadstack( 1330 thread_t thread, 1331 uint32_t *ts, 1332 uint32_t total_size, 1333 mach_vm_offset_t *user_stack, 1334 int *customstack 1335) 1336{ 1337 kern_return_t ret; 1338 uint32_t size; 1339 int flavor; 1340 uint32_t stack_size; 1341 1342 while (total_size > 0) { 1343 flavor = *ts++; 1344 size = *ts++; 1345 if (UINT32_MAX-2 < size || 1346 UINT32_MAX/sizeof(uint32_t) < size+2) 1347 return (LOAD_BADMACHO); 1348 stack_size = (size+2)*sizeof(uint32_t); 1349 if (stack_size > total_size) 1350 return(LOAD_BADMACHO); 1351 total_size -= stack_size; 1352 1353 /* 1354 * Third argument is a kernel space pointer; it gets cast 1355 * to the appropriate type in thread_userstack() based on 1356 * the value of flavor. 1357 */ 1358 ret = thread_userstack(thread, flavor, (thread_state_t)ts, size, user_stack, customstack); 1359 if (ret != KERN_SUCCESS) { 1360 return(LOAD_FAILURE); 1361 } 1362 ts += size; /* ts is a (uint32_t *) */ 1363 } 1364 return(LOAD_SUCCESS); 1365} 1366 1367static 1368load_return_t 1369load_threadentry( 1370 thread_t thread, 1371 uint32_t *ts, 1372 uint32_t total_size, 1373 mach_vm_offset_t *entry_point 1374) 1375{ 1376 kern_return_t ret; 1377 uint32_t size; 1378 int flavor; 1379 uint32_t entry_size; 1380 1381 /* 1382 * Set the thread state. 1383 */ 1384 *entry_point = MACH_VM_MIN_ADDRESS; 1385 while (total_size > 0) { 1386 flavor = *ts++; 1387 size = *ts++; 1388 if (UINT32_MAX-2 < size || 1389 UINT32_MAX/sizeof(uint32_t) < size+2) 1390 return (LOAD_BADMACHO); 1391 entry_size = (size+2)*sizeof(uint32_t); 1392 if (entry_size > total_size) 1393 return(LOAD_BADMACHO); 1394 total_size -= entry_size; 1395 /* 1396 * Third argument is a kernel space pointer; it gets cast 1397 * to the appropriate type in thread_entrypoint() based on 1398 * the value of flavor. 1399 */ 1400 ret = thread_entrypoint(thread, flavor, (thread_state_t)ts, size, entry_point); 1401 if (ret != KERN_SUCCESS) { 1402 return(LOAD_FAILURE); 1403 } 1404 ts += size; /* ts is a (uint32_t *) */ 1405 } 1406 return(LOAD_SUCCESS); 1407} 1408 1409struct macho_data { 1410 struct nameidata __nid; 1411 union macho_vnode_header { 1412 struct mach_header mach_header; 1413 struct fat_header fat_header; 1414 char __pad[512]; 1415 } __header; 1416}; 1417 1418static load_return_t 1419load_dylinker( 1420 struct dylinker_command *lcp, 1421 integer_t archbits, 1422 vm_map_t map, 1423 thread_t thread, 1424 int depth, 1425 int64_t slide, 1426 load_result_t *result 1427) 1428{ 1429 char *name; 1430 char *p; 1431 struct vnode *vp = NULLVP; /* set by get_macho_vnode() */ 1432 struct mach_header *header; 1433 off_t file_offset = 0; /* set by get_macho_vnode() */ 1434 off_t macho_size = 0; /* set by get_macho_vnode() */ 1435 load_result_t *myresult; 1436 kern_return_t ret; 1437 struct macho_data *macho_data; 1438 struct { 1439 struct mach_header __header; 1440 load_result_t __myresult; 1441 struct macho_data __macho_data; 1442 } *dyld_data; 1443 1444 if (lcp->cmdsize < sizeof(*lcp)) 1445 return (LOAD_BADMACHO); 1446 1447 name = (char *)lcp + lcp->name.offset; 1448 /* 1449 * Check for a proper null terminated string. 1450 */ 1451 p = name; 1452 do { 1453 if (p >= (char *)lcp + lcp->cmdsize) 1454 return(LOAD_BADMACHO); 1455 } while (*p++); 1456 1457 /* Allocate wad-of-data from heap to reduce excessively deep stacks */ 1458 1459 MALLOC(dyld_data, void *, sizeof (*dyld_data), M_TEMP, M_WAITOK); 1460 header = &dyld_data->__header; 1461 myresult = &dyld_data->__myresult; 1462 macho_data = &dyld_data->__macho_data; 1463 1464 ret = get_macho_vnode(name, archbits, header, 1465 &file_offset, &macho_size, macho_data, &vp); 1466 if (ret) 1467 goto novp_out; 1468 1469 *myresult = load_result_null; 1470 1471 /* 1472 * First try to map dyld in directly. This should work most of 1473 * the time since there shouldn't normally be something already 1474 * mapped to its address. 1475 */ 1476 1477 ret = parse_machfile(vp, map, thread, header, file_offset, 1478 macho_size, depth, slide, 0, myresult); 1479 1480 /* 1481 * If it turned out something was in the way, then we'll take 1482 * take this longer path to preflight dyld's vm ranges, then 1483 * map it at a free location in the address space. 1484 */ 1485 1486 if (ret == LOAD_NOSPACE) { 1487 mach_vm_offset_t dyl_start, map_addr; 1488 mach_vm_size_t dyl_length; 1489 int64_t slide_amount; 1490 1491 *myresult = load_result_null; 1492 1493 /* 1494 * Preflight parsing the Mach-O file with a NULL 1495 * map, which will return the ranges needed for a 1496 * subsequent map attempt (with a slide) in "myresult" 1497 */ 1498 ret = parse_machfile(vp, VM_MAP_NULL, THREAD_NULL, header, 1499 file_offset, macho_size, depth, 1500 0 /* slide */, 0, myresult); 1501 1502 if (ret != LOAD_SUCCESS) { 1503 goto out; 1504 } 1505 1506 dyl_start = myresult->min_vm_addr; 1507 dyl_length = myresult->max_vm_addr - myresult->min_vm_addr; 1508 1509 dyl_length += slide; 1510 1511 /* To find an appropriate load address, do a quick allocation */ 1512 map_addr = dyl_start; 1513 ret = mach_vm_allocate(map, &map_addr, dyl_length, VM_FLAGS_ANYWHERE); 1514 if (ret != KERN_SUCCESS) { 1515 ret = LOAD_NOSPACE; 1516 goto out; 1517 } 1518 1519 ret = mach_vm_deallocate(map, map_addr, dyl_length); 1520 if (ret != KERN_SUCCESS) { 1521 ret = LOAD_NOSPACE; 1522 goto out; 1523 } 1524 1525 if (map_addr < dyl_start) 1526 slide_amount = -(int64_t)(dyl_start - map_addr); 1527 else 1528 slide_amount = (int64_t)(map_addr - dyl_start); 1529 1530 slide_amount += slide; 1531 1532 *myresult = load_result_null; 1533 1534 ret = parse_machfile(vp, map, thread, header, 1535 file_offset, macho_size, depth, 1536 slide_amount, 0, myresult); 1537 1538 if (ret) { 1539 goto out; 1540 } 1541 } 1542 1543 if (ret == LOAD_SUCCESS) { 1544 result->dynlinker = TRUE; 1545 result->entry_point = myresult->entry_point; 1546 result->validentry = myresult->validentry; 1547 result->all_image_info_addr = myresult->all_image_info_addr; 1548 result->all_image_info_size = myresult->all_image_info_size; 1549 if (myresult->platform_binary) { 1550 result->csflags |= CS_DYLD_PLATFORM; 1551 } 1552 } 1553out: 1554 vnode_put(vp); 1555novp_out: 1556 FREE(dyld_data, M_TEMP); 1557 return (ret); 1558 1559} 1560 1561static load_return_t 1562load_code_signature( 1563 struct linkedit_data_command *lcp, 1564 struct vnode *vp, 1565 off_t macho_offset, 1566 off_t macho_size, 1567 cpu_type_t cputype, 1568 load_result_t *result) 1569{ 1570 int ret; 1571 kern_return_t kr; 1572 vm_offset_t addr; 1573 int resid; 1574 struct cs_blob *blob; 1575 int error; 1576 vm_size_t blob_size; 1577 1578 addr = 0; 1579 blob = NULL; 1580 1581 if (lcp->cmdsize != sizeof (struct linkedit_data_command) || 1582 lcp->dataoff + lcp->datasize > macho_size) { 1583 ret = LOAD_BADMACHO; 1584 goto out; 1585 } 1586 1587 blob = ubc_cs_blob_get(vp, cputype, -1); 1588 if (blob != NULL) { 1589 /* we already have a blob for this vnode and cputype */ 1590 if (blob->csb_cpu_type == cputype && 1591 blob->csb_base_offset == macho_offset && 1592 blob->csb_mem_size == lcp->datasize) { 1593 /* it matches the blob we want here, lets verify the version */ 1594 if(0 != ubc_cs_generation_check(vp)) { 1595 if (0 != ubc_cs_blob_revalidate(vp, blob)) { 1596 ret = LOAD_FAILURE; /* set error same as from ubc_cs_blob_add */ 1597 goto out; 1598 } 1599 } 1600 ret = LOAD_SUCCESS; 1601 } else { 1602 /* the blob has changed for this vnode: fail ! */ 1603 ret = LOAD_BADMACHO; 1604 } 1605 goto out; 1606 } 1607 1608 blob_size = lcp->datasize; 1609 kr = ubc_cs_blob_allocate(&addr, &blob_size); 1610 if (kr != KERN_SUCCESS) { 1611 ret = LOAD_NOSPACE; 1612 goto out; 1613 } 1614 1615 resid = 0; 1616 error = vn_rdwr(UIO_READ, 1617 vp, 1618 (caddr_t) addr, 1619 lcp->datasize, 1620 macho_offset + lcp->dataoff, 1621 UIO_SYSSPACE, 1622 0, 1623 kauth_cred_get(), 1624 &resid, 1625 current_proc()); 1626 if (error || resid != 0) { 1627 ret = LOAD_IOERROR; 1628 goto out; 1629 } 1630 1631 if (ubc_cs_blob_add(vp, 1632 cputype, 1633 macho_offset, 1634 addr, 1635 lcp->datasize)) { 1636 ret = LOAD_FAILURE; 1637 goto out; 1638 } else { 1639 /* ubc_cs_blob_add() has consumed "addr" */ 1640 addr = 0; 1641 } 1642 1643#if CHECK_CS_VALIDATION_BITMAP 1644 ubc_cs_validation_bitmap_allocate( vp ); 1645#endif 1646 1647 blob = ubc_cs_blob_get(vp, cputype, -1); 1648 1649 ret = LOAD_SUCCESS; 1650out: 1651 if (ret == LOAD_SUCCESS) { 1652 result->csflags |= blob->csb_flags; 1653 result->platform_binary = blob->csb_platform_binary; 1654 } 1655 if (addr != 0) { 1656 ubc_cs_blob_deallocate(addr, blob_size); 1657 addr = 0; 1658 } 1659 1660 return ret; 1661} 1662 1663 1664#if CONFIG_CODE_DECRYPTION 1665 1666static load_return_t 1667set_code_unprotect( 1668 struct encryption_info_command *eip, 1669 caddr_t addr, 1670 vm_map_t map, 1671 int64_t slide, 1672 struct vnode *vp, 1673 cpu_type_t cputype, 1674 cpu_subtype_t cpusubtype) 1675{ 1676 int result, len; 1677 pager_crypt_info_t crypt_info; 1678 const char * cryptname = 0; 1679 char *vpath; 1680 1681 size_t offset; 1682 struct segment_command_64 *seg64; 1683 struct segment_command *seg32; 1684 vm_map_offset_t map_offset, map_size; 1685 kern_return_t kr; 1686 1687 if (eip->cmdsize < sizeof(*eip)) return LOAD_BADMACHO; 1688 1689 switch(eip->cryptid) { 1690 case 0: 1691 /* not encrypted, just an empty load command */ 1692 return LOAD_SUCCESS; 1693 case 1: 1694 cryptname="com.apple.unfree"; 1695 break; 1696 case 0x10: 1697 /* some random cryptid that you could manually put into 1698 * your binary if you want NULL */ 1699 cryptname="com.apple.null"; 1700 break; 1701 default: 1702 return LOAD_BADMACHO; 1703 } 1704 1705 if (map == VM_MAP_NULL) return (LOAD_SUCCESS); 1706 if (NULL == text_crypter_create) return LOAD_FAILURE; 1707 1708 MALLOC_ZONE(vpath, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); 1709 if(vpath == NULL) return LOAD_FAILURE; 1710 1711 len = MAXPATHLEN; 1712 result = vn_getpath(vp, vpath, &len); 1713 if(result) { 1714 FREE_ZONE(vpath, MAXPATHLEN, M_NAMEI); 1715 return LOAD_FAILURE; 1716 } 1717 1718 /* set up decrypter first */ 1719 crypt_file_data_t crypt_data = { 1720 .filename = vpath, 1721 .cputype = cputype, 1722 .cpusubtype = cpusubtype}; 1723 kr=text_crypter_create(&crypt_info, cryptname, (void*)&crypt_data); 1724 FREE_ZONE(vpath, MAXPATHLEN, M_NAMEI); 1725 1726 if(kr) { 1727 printf("set_code_unprotect: unable to create decrypter %s, kr=%d\n", 1728 cryptname, kr); 1729 if (kr == kIOReturnNotPrivileged) { 1730 /* text encryption returned decryption failure */ 1731 return(LOAD_DECRYPTFAIL); 1732 }else 1733 return LOAD_RESOURCE; 1734 } 1735 1736 /* this is terrible, but we have to rescan the load commands to find the 1737 * virtual address of this encrypted stuff. This code is gonna look like 1738 * the dyld source one day... */ 1739 struct mach_header *header = (struct mach_header *)addr; 1740 size_t mach_header_sz = sizeof(struct mach_header); 1741 if (header->magic == MH_MAGIC_64 || 1742 header->magic == MH_CIGAM_64) { 1743 mach_header_sz = sizeof(struct mach_header_64); 1744 } 1745 offset = mach_header_sz; 1746 uint32_t ncmds = header->ncmds; 1747 while (ncmds--) { 1748 /* 1749 * Get a pointer to the command. 1750 */ 1751 struct load_command *lcp = (struct load_command *)(addr + offset); 1752 offset += lcp->cmdsize; 1753 1754 switch(lcp->cmd) { 1755 case LC_SEGMENT_64: 1756 seg64 = (struct segment_command_64 *)lcp; 1757 if ((seg64->fileoff <= eip->cryptoff) && 1758 (seg64->fileoff+seg64->filesize >= 1759 eip->cryptoff+eip->cryptsize)) { 1760 map_offset = seg64->vmaddr + eip->cryptoff - seg64->fileoff + slide; 1761 map_size = eip->cryptsize; 1762 goto remap_now; 1763 } 1764 case LC_SEGMENT: 1765 seg32 = (struct segment_command *)lcp; 1766 if ((seg32->fileoff <= eip->cryptoff) && 1767 (seg32->fileoff+seg32->filesize >= 1768 eip->cryptoff+eip->cryptsize)) { 1769 map_offset = seg32->vmaddr + eip->cryptoff - seg32->fileoff + slide; 1770 map_size = eip->cryptsize; 1771 goto remap_now; 1772 } 1773 } 1774 } 1775 1776 /* if we get here, did not find anything */ 1777 return LOAD_BADMACHO; 1778 1779remap_now: 1780 /* now remap using the decrypter */ 1781 kr = vm_map_apple_protected(map, map_offset, map_offset+map_size, &crypt_info); 1782 if(kr) { 1783 printf("set_code_unprotect(): mapping failed with %x\n", kr); 1784 crypt_info.crypt_end(crypt_info.crypt_ops); 1785 return LOAD_PROTECT; 1786 } 1787 1788 return LOAD_SUCCESS; 1789} 1790 1791#endif 1792 1793/* 1794 * This routine exists to support the load_dylinker(). 1795 * 1796 * This routine has its own, separate, understanding of the FAT file format, 1797 * which is terrifically unfortunate. 1798 */ 1799static 1800load_return_t 1801get_macho_vnode( 1802 char *path, 1803 integer_t archbits, 1804 struct mach_header *mach_header, 1805 off_t *file_offset, 1806 off_t *macho_size, 1807 struct macho_data *data, 1808 struct vnode **vpp 1809) 1810{ 1811 struct vnode *vp; 1812 vfs_context_t ctx = vfs_context_current(); 1813 proc_t p = vfs_context_proc(ctx); 1814 kauth_cred_t kerncred; 1815 struct nameidata *ndp = &data->__nid; 1816 boolean_t is_fat; 1817 struct fat_arch fat_arch; 1818 int error; 1819 int resid; 1820 union macho_vnode_header *header = &data->__header; 1821 off_t fsize = (off_t)0; 1822 1823 /* 1824 * Capture the kernel credential for use in the actual read of the 1825 * file, since the user doing the execution may have execute rights 1826 * but not read rights, but to exec something, we have to either map 1827 * or read it into the new process address space, which requires 1828 * read rights. This is to deal with lack of common credential 1829 * serialization code which would treat NOCRED as "serialize 'root'". 1830 */ 1831 kerncred = vfs_context_ucred(vfs_context_kernel()); 1832 1833 /* init the namei data to point the file user's program name */ 1834 NDINIT(ndp, LOOKUP, OP_OPEN, FOLLOW | LOCKLEAF, UIO_SYSSPACE, CAST_USER_ADDR_T(path), ctx); 1835 1836 if ((error = namei(ndp)) != 0) { 1837 if (error == ENOENT) { 1838 error = LOAD_ENOENT; 1839 } else { 1840 error = LOAD_FAILURE; 1841 } 1842 return(error); 1843 } 1844 nameidone(ndp); 1845 vp = ndp->ni_vp; 1846 1847 /* check for regular file */ 1848 if (vp->v_type != VREG) { 1849 error = LOAD_PROTECT; 1850 goto bad1; 1851 } 1852 1853 /* get size */ 1854 if ((error = vnode_size(vp, &fsize, ctx)) != 0) { 1855 error = LOAD_FAILURE; 1856 goto bad1; 1857 } 1858 1859 /* Check mount point */ 1860 if (vp->v_mount->mnt_flag & MNT_NOEXEC) { 1861 error = LOAD_PROTECT; 1862 goto bad1; 1863 } 1864 1865 /* check access */ 1866 if ((error = vnode_authorize(vp, NULL, KAUTH_VNODE_EXECUTE | KAUTH_VNODE_READ_DATA, ctx)) != 0) { 1867 error = LOAD_PROTECT; 1868 goto bad1; 1869 } 1870 1871 /* try to open it */ 1872 if ((error = VNOP_OPEN(vp, FREAD, ctx)) != 0) { 1873 error = LOAD_PROTECT; 1874 goto bad1; 1875 } 1876 1877 if ((error = vn_rdwr(UIO_READ, vp, (caddr_t)header, sizeof (*header), 0, 1878 UIO_SYSSPACE, IO_NODELOCKED, kerncred, &resid, p)) != 0) { 1879 error = LOAD_IOERROR; 1880 goto bad2; 1881 } 1882 1883 if (header->mach_header.magic == MH_MAGIC || 1884 header->mach_header.magic == MH_MAGIC_64) { 1885 is_fat = FALSE; 1886 } else if (header->fat_header.magic == FAT_MAGIC || 1887 header->fat_header.magic == FAT_CIGAM) { 1888 is_fat = TRUE; 1889 } else { 1890 error = LOAD_BADMACHO; 1891 goto bad2; 1892 } 1893 1894 if (is_fat) { 1895 /* Look up our architecture in the fat file. */ 1896 error = fatfile_getarch_with_bits(vp, archbits, 1897 (vm_offset_t)(&header->fat_header), &fat_arch); 1898 if (error != LOAD_SUCCESS) 1899 goto bad2; 1900 1901 /* Read the Mach-O header out of it */ 1902 error = vn_rdwr(UIO_READ, vp, (caddr_t)&header->mach_header, 1903 sizeof (header->mach_header), fat_arch.offset, 1904 UIO_SYSSPACE, IO_NODELOCKED, kerncred, &resid, p); 1905 if (error) { 1906 error = LOAD_IOERROR; 1907 goto bad2; 1908 } 1909 1910 /* Is this really a Mach-O? */ 1911 if (header->mach_header.magic != MH_MAGIC && 1912 header->mach_header.magic != MH_MAGIC_64) { 1913 error = LOAD_BADMACHO; 1914 goto bad2; 1915 } 1916 1917 *file_offset = fat_arch.offset; 1918 *macho_size = fat_arch.size; 1919 } else { 1920 /* 1921 * Force get_macho_vnode() to fail if the architecture bits 1922 * do not match the expected architecture bits. This in 1923 * turn causes load_dylinker() to fail for the same reason, 1924 * so it ensures the dynamic linker and the binary are in 1925 * lock-step. This is potentially bad, if we ever add to 1926 * the CPU_ARCH_* bits any bits that are desirable but not 1927 * required, since the dynamic linker might work, but we will 1928 * refuse to load it because of this check. 1929 */ 1930 if ((cpu_type_t)(header->mach_header.cputype & CPU_ARCH_MASK) != archbits) { 1931 error = LOAD_BADARCH; 1932 goto bad2; 1933 } 1934 1935 *file_offset = 0; 1936 *macho_size = fsize; 1937 } 1938 1939 *mach_header = header->mach_header; 1940 *vpp = vp; 1941 1942 ubc_setsize(vp, fsize); 1943 return (error); 1944 1945bad2: 1946 (void) VNOP_CLOSE(vp, FREAD, ctx); 1947bad1: 1948 vnode_put(vp); 1949 return(error); 1950} 1951