X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/4452a7af2eac33dbad800bcc91f2399d62c18f53..7e41aa883dd258f888d0470250eead40a53ef1f5:/bsd/kern/mach_loader.c diff --git a/bsd/kern/mach_loader.c b/bsd/kern/mach_loader.c index 42a182a9b..d4f084e31 100644 --- a/bsd/kern/mach_loader.c +++ b/bsd/kern/mach_loader.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2010 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * @@ -49,23 +49,27 @@ #include #include #include +#include #include #include /* vm_allocate() */ #include /* mach_vm_allocate() */ #include -#include #include #include #include +#include +#include #include #include #include +#include #include #include #include +#include #include #include @@ -75,45 +79,48 @@ #include #include #include -#include #include +#include /* for kIOReturnNotPrivileged */ -/* - * XXX vm/pmap.h should not treat these prototypes as MACH_KERNEL_PRIVATE - * when KERNEL is defined. - */ -extern pmap_t pmap_create(vm_map_size_t size, boolean_t is_64bit); -extern void pmap_switch(pmap_t); -extern void pmap_map_sharedpage(task_t task, pmap_t pmap); +#include /* - * XXX kern/thread.h should not treat these prototypes as MACH_KERNEL_PRIVATE + * XXX vm/pmap.h should not treat these prototypes as MACH_KERNEL_PRIVATE * when KERNEL is defined. */ -extern kern_return_t thread_setstatus(thread_t thread, int flavor, - thread_state_t tstate, - mach_msg_type_number_t count); - -extern kern_return_t thread_state_initialize(thread_t thread); - +extern pmap_t pmap_create(ledger_t ledger, vm_map_size_t size, + boolean_t is_64bit); /* XXX should have prototypes in a shared header file */ extern int get_map_nentries(vm_map_t); -extern kern_return_t thread_userstack(thread_t, int, thread_state_t, - unsigned int, mach_vm_offset_t *, int *); -extern kern_return_t thread_entrypoint(thread_t, int, thread_state_t, - unsigned int, mach_vm_offset_t *); +extern kern_return_t memory_object_signed(memory_object_control_t control, + boolean_t is_signed); /* An empty load_result_t */ static load_result_t load_result_null = { - MACH_VM_MIN_ADDRESS, - MACH_VM_MIN_ADDRESS, - MACH_VM_MIN_ADDRESS, - 0, - 0, - 0, - 0 + .mach_header = MACH_VM_MIN_ADDRESS, + .entry_point = MACH_VM_MIN_ADDRESS, + .user_stack = MACH_VM_MIN_ADDRESS, + .user_stack_size = 0, + .all_image_info_addr = MACH_VM_MIN_ADDRESS, + .all_image_info_size = 0, + .thread_count = 0, + .unixproc = 0, + .dynlinker = 0, + .needs_dynlinker = 0, + .prog_allocated_stack = 0, + .prog_stack_size = 0, + .validentry = 0, + .using_lcmain = 0, + .csflags = 0, + .has_pagezero = 0, + .uuid = { 0 }, + .min_vm_addr = MACH_VM_MAX_ADDRESS, + .max_vm_addr = MACH_VM_MIN_ADDRESS, + .cs_end_offset = 0, + .threadstate = NULL, + .threadstate_sz = 0 }; /* @@ -123,64 +130,88 @@ static load_return_t parse_machfile( struct vnode *vp, vm_map_t map, - thread_t thr_act, + thread_t thread, struct mach_header *header, off_t file_offset, off_t macho_size, - boolean_t shared_regions, - boolean_t clean_regions, int depth, + int64_t slide, + int64_t dyld_slide, load_result_t *result ); static load_return_t load_segment( - struct segment_command *scp, - void * pager, + struct load_command *lcp, + uint32_t filetype, + void *control, off_t pager_offset, off_t macho_size, - off_t end_of_file, - vm_map_t map, + struct vnode *vp, + vm_map_t map, + int64_t slide, load_result_t *result ); static load_return_t -load_segment_64( - struct segment_command_64 *scp64, - void *pager, - off_t pager_offset, - off_t macho_size, - off_t end_of_file, - vm_map_t map, +load_uuid( + struct uuid_command *uulp, + char *command_end, load_result_t *result ); static load_return_t -load_unixthread( - struct thread_command *tcp, - thread_t thr_act, - load_result_t *result +load_code_signature( + struct linkedit_data_command *lcp, + struct vnode *vp, + off_t macho_offset, + off_t macho_size, + cpu_type_t cputype, + load_result_t *result); + +#if CONFIG_CODE_DECRYPTION +static load_return_t +set_code_unprotect( + struct encryption_info_command *lcp, + caddr_t addr, + vm_map_t map, + int64_t slide, + struct vnode *vp, + off_t macho_offset, + cpu_type_t cputype, + cpu_subtype_t cpusubtype); +#endif + +static +load_return_t +load_main( + struct entry_point_command *epc, + thread_t thread, + int64_t slide, + load_result_t *result ); static load_return_t -load_thread( +load_unixthread( struct thread_command *tcp, - thread_t thr_act, + thread_t thread, + int64_t slide, load_result_t *result ); static load_return_t load_threadstate( thread_t thread, - unsigned long *ts, - unsigned long total_size + uint32_t *ts, + uint32_t total_size, + load_result_t * ); static load_return_t load_threadstack( thread_t thread, - unsigned long *ts, - unsigned long total_size, + uint32_t *ts, + uint32_t total_size, mach_vm_offset_t *user_stack, int *customstack ); @@ -188,8 +219,8 @@ load_threadstack( static load_return_t load_threadentry( thread_t thread, - unsigned long *ts, - unsigned long total_size, + uint32_t *ts, + uint32_t total_size, mach_vm_offset_t *entry_point ); @@ -198,13 +229,14 @@ load_dylinker( struct dylinker_command *lcp, integer_t archbits, vm_map_t map, - thread_t thr_act, + thread_t thread, int depth, - load_result_t *result, - boolean_t clean_regions, - boolean_t is_64bit + int64_t slide, + load_result_t *result ); +struct macho_data; + static load_return_t get_macho_vnode( char *path, @@ -212,60 +244,163 @@ get_macho_vnode( struct mach_header *mach_header, off_t *file_offset, off_t *macho_size, + struct macho_data *macho_data, struct vnode **vpp ); +static inline void +widen_segment_command(const struct segment_command *scp32, + struct segment_command_64 *scp) +{ + scp->cmd = scp32->cmd; + scp->cmdsize = scp32->cmdsize; + bcopy(scp32->segname, scp->segname, sizeof(scp->segname)); + scp->vmaddr = scp32->vmaddr; + scp->vmsize = scp32->vmsize; + scp->fileoff = scp32->fileoff; + scp->filesize = scp32->filesize; + scp->maxprot = scp32->maxprot; + scp->initprot = scp32->initprot; + scp->nsects = scp32->nsects; + scp->flags = scp32->flags; +} + +static void +note_all_image_info_section(const struct segment_command_64 *scp, + boolean_t is64, size_t section_size, const void *sections, + int64_t slide, load_result_t *result) +{ + const union { + struct section s32; + struct section_64 s64; + } *sectionp; + unsigned int i; + + if (strncmp(scp->segname, "__DATA", sizeof(scp->segname)) != 0) + return; + for (i = 0; i < scp->nsects; ++i) { + sectionp = (const void *) + ((const char *)sections + section_size * i); + if (0 == strncmp(sectionp->s64.sectname, "__all_image_info", + sizeof(sectionp->s64.sectname))) { + result->all_image_info_addr = + is64 ? sectionp->s64.addr : sectionp->s32.addr; + result->all_image_info_addr += slide; + result->all_image_info_size = + is64 ? sectionp->s64.size : sectionp->s32.size; + return; + } + } +} + + load_return_t load_machfile( struct image_params *imgp, struct mach_header *header, - thread_t thr_act, - vm_map_t new_map, - boolean_t clean_regions, + thread_t thread, + vm_map_t *mapp, load_result_t *result ) { struct vnode *vp = imgp->ip_vp; off_t file_offset = imgp->ip_arch_offset; off_t macho_size = imgp->ip_arch_size; - + off_t file_size = imgp->ip_vattr->va_data_size; + vm_map_t new_map = *mapp; pmap_t pmap = 0; /* protected by create_map */ vm_map_t map; - vm_map_t old_map; load_result_t myresult; load_return_t lret; - boolean_t create_map = TRUE; + boolean_t create_map = FALSE; + boolean_t enforce_hard_pagezero = TRUE; + int spawn = (imgp->ip_flags & IMGPF_SPAWN); + task_t task = current_task(); + proc_t p = current_proc(); + mach_vm_offset_t aslr_offset = 0; + mach_vm_offset_t dyld_aslr_offset = 0; + kern_return_t kret; + + if (macho_size > file_size) { + return(LOAD_BADMACHO); + } + + if (new_map == VM_MAP_NULL) { + create_map = TRUE; + } - if (new_map != VM_MAP_NULL) { - create_map = FALSE; + /* + * If we are spawning, we have created backing objects for the process + * already, which include non-lazily creating the task map. So we + * are going to switch out the task map with one appropriate for the + * bitness of the image being loaded. + */ + if (spawn) { + create_map = TRUE; } if (create_map) { - old_map = current_map(); -#ifdef NO_NESTED_PMAP - pmap = get_task_pmap(current_task()); - pmap_reference(pmap); -#else /* NO_NESTED_PMAP */ - pmap = pmap_create((vm_map_size_t) 0, (imgp->ip_flags & IMGPF_IS_64BIT)); -#endif /* NO_NESTED_PMAP */ + task_t ledger_task; + if (imgp->ip_new_thread) { + ledger_task = get_threadtask(imgp->ip_new_thread); + } else { + ledger_task = task; + } + pmap = pmap_create(get_task_ledger(ledger_task), + (vm_map_size_t) 0, + ((imgp->ip_flags & IMGPF_IS_64BIT) != 0)); + pal_switch_pmap(thread, pmap, imgp->ip_flags & IMGPF_IS_64BIT); map = vm_map_create(pmap, 0, - vm_compute_max_offset((imgp->ip_flags & IMGPF_IS_64BIT)), + vm_compute_max_offset(((imgp->ip_flags & IMGPF_IS_64BIT) == IMGPF_IS_64BIT)), TRUE); } else map = new_map; - if ( (header->flags & MH_ALLOW_STACK_EXECUTION) ) +#if (__ARM_ARCH_7K__ >= 2) && defined(PLATFORM_WatchOS) + /* enforce 16KB alignment for watch targets with new ABI */ + vm_map_set_page_shift(map, SIXTEENK_PAGE_SHIFT); +#endif /* __arm64__ */ + +#ifndef CONFIG_ENFORCE_SIGNED_CODE + /* This turns off faulting for executable pages, which allows + * to circumvent Code Signing Enforcement. The per process + * flag (CS_ENFORCEMENT) is not set yet, but we can use the + * global flag. + */ + if ( !cs_enforcement(NULL) && (header->flags & MH_ALLOW_STACK_EXECUTION) ) vm_map_disable_NX(map); +#endif + + /* Forcibly disallow execution from data pages on even if the arch + * normally permits it. */ + if ((header->flags & MH_NO_HEAP_EXECUTION) && !(imgp->ip_flags & IMGPF_ALLOW_DATA_EXEC)) + vm_map_disallow_data_exec(map); + + /* + * Compute a random offset for ASLR, and an independent random offset for dyld. + */ + if (!(imgp->ip_flags & IMGPF_DISABLE_ASLR)) { + uint64_t max_slide_pages; + max_slide_pages = vm_map_get_max_aslr_slide_pages(map); + + aslr_offset = random(); + aslr_offset %= max_slide_pages; + aslr_offset <<= vm_map_page_shift(map); + + dyld_aslr_offset = random(); + dyld_aslr_offset %= max_slide_pages; + dyld_aslr_offset <<= vm_map_page_shift(map); + } + if (!result) result = &myresult; *result = load_result_null; - lret = parse_machfile(vp, map, thr_act, header, file_offset, macho_size, - ((imgp->ip_flags & IMGPF_IS_64BIT) == 0), /* shared regions? */ - clean_regions, 0, result); + lret = parse_machfile(vp, map, thread, header, file_offset, macho_size, + 0, (int64_t)aslr_offset, (int64_t)dyld_aslr_offset, result); if (lret != LOAD_SUCCESS) { if (create_map) { @@ -274,41 +409,77 @@ load_machfile( return(lret); } +#if __x86_64__ /* - * For 64-bit users, check for presence of a 4GB page zero - * which will enable the kernel to share the user's address space - * and hence avoid TLB flushes on kernel entry/exit - */ - if ((imgp->ip_flags & IMGPF_IS_64BIT) && - vm_map_has_4GB_pagezero(map)) - vm_map_set_4GB_pagezero(map); - - /* - * Commit to new map. First make sure that the current - * users of the task get done with it, and that we clean - * up the old contents of IPC and memory. The task is - * guaranteed to be single threaded upon return (us). - * - * Swap the new map for the old, which consumes our new map - * reference but each leaves us responsible for the old_map reference. - * That lets us get off the pmap associated with it, and - * then we can release it. + * On x86, for compatibility, don't enforce the hard page-zero restriction for 32-bit binaries. */ + if ((imgp->ip_flags & IMGPF_IS_64BIT) == 0) { + enforce_hard_pagezero = FALSE; + } +#endif + /* + * Check to see if the page zero is enforced by the map->min_offset. + */ + if (enforce_hard_pagezero && + (vm_map_has_hard_pagezero(map, 0x1000) == FALSE)) { + { + if (create_map) { + vm_map_deallocate(map); /* will lose pmap reference too */ + } + return (LOAD_BADMACHO); + } + } - if (create_map) { - task_halt(current_task()); - - old_map = swap_task_map(current_task(), map); - vm_map_clear_4GB_pagezero(old_map); -#ifndef NO_NESTED_PMAP - pmap_switch(pmap); /* Make sure we are using the new pmap */ -#endif /* !NO_NESTED_PMAP */ - vm_map_deallocate(old_map); + if (create_map) { + /* + * If this is an exec, then we are going to destroy the old + * task, and it's correct to halt it; if it's spawn, the + * task is not yet running, and it makes no sense. + */ + if (!spawn) { + /* + * Mark the task as halting and start the other + * threads towards terminating themselves. Then + * make sure any threads waiting for a process + * transition get informed that we are committed to + * this transition, and then finally complete the + * task halting (wait for threads and then cleanup + * task resources). + * + * NOTE: task_start_halt() makes sure that no new + * threads are created in the task during the transition. + * We need to mark the workqueue as exiting before we + * wait for threads to terminate (at the end of which + * we no longer have a prohibition on thread creation). + * + * Finally, clean up any lingering workqueue data structures + * that may have been left behind by the workqueue threads + * as they exited (and then clean up the work queue itself). + */ + kret = task_start_halt(task); + if (kret != KERN_SUCCESS) { + vm_map_deallocate(map); /* will lose pmap reference too */ + return (LOAD_FAILURE); + } + proc_transcommit(p, 0); + workqueue_mark_exiting(p); + task_complete_halt(task); + workqueue_exit(p); + kqueue_dealloc(p->p_wqkqueue); + p->p_wqkqueue = NULL; + } + *mapp = map; } return(LOAD_SUCCESS); } -int dylink_test = 1; +int macho_printf = 0; +#define MACHO_PRINTF(args) \ + do { \ + if (macho_printf) { \ + printf args; \ + } \ + } while (0) /* * The file size of a mach-o file is limited to 32 bits; this is because @@ -317,20 +488,22 @@ int dylink_test = 1; * bits in the file format itself. We read into the kernel buffer the * commands section, and then parse it in order to parse the mach-o file * format load_command segment(s). We are only interested in a subset of - * the total set of possible commands. + * the total set of possible commands. If "map"==VM_MAP_NULL or + * "thread"==THREAD_NULL, do not make permament VM modifications, + * just preflight the parse. */ static load_return_t parse_machfile( struct vnode *vp, vm_map_t map, - thread_t thr_act, + thread_t thread, struct mach_header *header, off_t file_offset, off_t macho_size, - boolean_t shared_regions, - boolean_t clean_regions, int depth, + int64_t aslr_offset, + int64_t dyld_aslr_offset, load_result_t *result ) { @@ -338,7 +511,7 @@ parse_machfile( struct load_command *lcp; struct dylinker_command *dlp = 0; integer_t dlarchbits = 0; - void * pager; + void * control; load_return_t ret = LOAD_SUCCESS; caddr_t addr; void * kl_addr; @@ -346,12 +519,13 @@ parse_machfile( size_t offset; size_t oldoffset; /* for overflow check */ int pass; - struct proc *p = current_proc(); /* XXXX */ + proc_t p = current_proc(); /* XXXX */ int error; - int resid=0; - task_t task; + int resid = 0; size_t mach_header_sz = sizeof(struct mach_header); boolean_t abi64; + boolean_t got_code_signatures = FALSE; + int64_t slide = 0; if (header->magic == MH_MAGIC_64 || header->magic == MH_CIGAM_64) { @@ -361,40 +535,34 @@ parse_machfile( /* * Break infinite recursion */ - if (depth > 6) + if (depth > 1) { return(LOAD_FAILURE); - - task = (task_t)get_threadtask(thr_act); + } depth++; /* * Check to see if right machine type. */ - if (((cpu_type_t)(header->cputype & ~CPU_ARCH_MASK) != cpu_type()) || - !grade_binary(header->cputype, header->cpusubtype)) + if (((cpu_type_t)(header->cputype & ~CPU_ARCH_MASK) != (cpu_type() & ~CPU_ARCH_MASK)) || + !grade_binary(header->cputype, + header->cpusubtype & ~CPU_SUBTYPE_MASK)) return(LOAD_BADARCH); abi64 = ((header->cputype & CPU_ARCH_ABI64) == CPU_ARCH_ABI64); switch (header->filetype) { - case MH_OBJECT: case MH_EXECUTE: - case MH_PRELOAD: - if (depth != 1) - return (LOAD_FAILURE); - break; - - case MH_FVMLIB: - case MH_DYLIB: - if (depth == 1) + if (depth != 1) { return (LOAD_FAILURE); - break; + } + break; case MH_DYLINKER: - if (depth != 2) + if (depth != 2) { return (LOAD_FAILURE); + } break; default: @@ -404,14 +572,13 @@ parse_machfile( /* * Get the pager for the file. */ - UBCINFOCHECK("parse_machfile", vp); - pager = (void *) ubc_getpager(vp); + control = ubc_getobject(vp, UBC_FLAGS_NONE); /* * Map portion that must be accessible directly into * kernel's map. */ - if ((mach_header_sz + header->sizeofcmds) > macho_size) + if ((off_t)(mach_header_sz + header->sizeofcmds) > macho_size) return(LOAD_BADMACHO); /* @@ -432,18 +599,54 @@ parse_machfile( return(LOAD_NOSPACE); error = vn_rdwr(UIO_READ, vp, addr, size, file_offset, - UIO_SYSSPACE32, 0, kauth_cred_get(), &resid, p); + UIO_SYSSPACE, 0, kauth_cred_get(), &resid, p); if (error) { - if (kl_addr ) + if (kl_addr) kfree(kl_addr, kl_size); return(LOAD_IOERROR); } - /* (void)ubc_map(vp, PROT_EXEC); */ /* NOT HERE */ - + + if (resid) { + /* We must be able to read in as much as the mach_header indicated */ + if (kl_addr) + kfree(kl_addr, kl_size); + return(LOAD_BADMACHO); + } + /* - * Scan through the commands, processing each one as necessary. + * For PIE and dyld, slide everything by the ASLR offset. + */ + if ((header->flags & MH_PIE) || (header->filetype == MH_DYLINKER)) { + slide = aslr_offset; + } + + /* + * Scan through the commands, processing each one as necessary. + * We parse in three passes through the headers: + * 0: determine if TEXT and DATA boundary can be page-aligned + * 1: thread state, uuid, code signature + * 2: segments + * 3: dyld, encryption, check entry point */ - for (pass = 1; pass <= 2; pass++) { + + for (pass = 0; pass <= 3; pass++) { + + if (pass == 0) { + /* see if we need to adjust the slide to re-align... */ + /* no re-alignment needed on X86_64 or ARM32 kernel */ + continue; + } else if (pass == 1) { + } + + /* + * Check that the entry point is contained in an executable segments + */ + if ((pass == 3) && (!result->using_lcmain && result->validentry == 0)) { + thread_state_initialize(thread); + ret = LOAD_FAILURE; + break; + } + /* * Loop through each of the load_commands indicated by the * Mach-O header; if an absurd value is provided, we just @@ -452,6 +655,7 @@ parse_machfile( */ offset = mach_header_sz; ncmds = header->ncmds; + while (ncmds--) { /* * Get a pointer to the command. @@ -480,47 +684,78 @@ parse_machfile( * intervention is required. */ switch(lcp->cmd) { - case LC_SEGMENT_64: - if (pass != 1) - break; - ret = load_segment_64( - (struct segment_command_64 *)lcp, - pager, - file_offset, - macho_size, - ubc_getsize(vp), - map, - result); - break; case LC_SEGMENT: - if (pass != 1) + if (pass == 0) { break; - ret = load_segment( - (struct segment_command *) lcp, - pager, - file_offset, - macho_size, - ubc_getsize(vp), - map, - result); + } + + if (pass != 2) + break; + + if (abi64) { + /* + * Having an LC_SEGMENT command for the + * wrong ABI is invalid + */ + ret = LOAD_BADMACHO; + break; + } + + ret = load_segment(lcp, + header->filetype, + control, + file_offset, + macho_size, + vp, + map, + slide, + result); break; - case LC_THREAD: + case LC_SEGMENT_64: if (pass != 2) break; - ret = load_thread((struct thread_command *)lcp, - thr_act, - result); + + if (!abi64) { + /* + * Having an LC_SEGMENT_64 command for the + * wrong ABI is invalid + */ + ret = LOAD_BADMACHO; + break; + } + + ret = load_segment(lcp, + header->filetype, + control, + file_offset, + macho_size, + vp, + map, + slide, + result); break; case LC_UNIXTHREAD: - if (pass != 2) + if (pass != 1) break; ret = load_unixthread( (struct thread_command *) lcp, - thr_act, + thread, + slide, + result); + break; + case LC_MAIN: + if (pass != 1) + break; + if (depth != 1) + break; + ret = load_main( + (struct entry_point_command *) lcp, + thread, + slide, result); break; case LC_LOAD_DYLINKER: - if (pass != 2) + if (pass != 3) break; if ((depth == 1) && (dlp == 0)) { dlp = (struct dylinker_command *)lcp; @@ -529,6 +764,105 @@ parse_machfile( ret = LOAD_FAILURE; } break; + case LC_UUID: + if (pass == 1 && depth == 1) { + ret = load_uuid((struct uuid_command *) lcp, + (char *)addr + mach_header_sz + header->sizeofcmds, + result); + } + break; + case LC_CODE_SIGNATURE: + /* CODE SIGNING */ + if (pass != 1) + break; + /* pager -> uip -> + load signatures & store in uip + set VM object "signed_pages" + */ + ret = load_code_signature( + (struct linkedit_data_command *) lcp, + vp, + file_offset, + macho_size, + header->cputype, + result); + if (ret != LOAD_SUCCESS) { + printf("proc %d: load code signature error %d " + "for file \"%s\"\n", + p->p_pid, ret, vp->v_name); + /* + * Allow injections to be ignored on devices w/o enforcement enabled + */ + if (!cs_enforcement(NULL)) + ret = LOAD_SUCCESS; /* ignore error */ + + } else { + got_code_signatures = TRUE; + } + + if (got_code_signatures) { + unsigned tainted = CS_VALIDATE_TAINTED; + boolean_t valid = FALSE; + struct cs_blob *blobs; + vm_size_t off = 0; + + + if (cs_debug > 10) + printf("validating initial pages of %s\n", vp->v_name); + blobs = ubc_get_cs_blobs(vp); + + while (off < size && ret == LOAD_SUCCESS) { + tainted = CS_VALIDATE_TAINTED; + + valid = cs_validate_page(blobs, + NULL, + file_offset + off, + addr + off, + &tainted); + if (!valid || (tainted & CS_VALIDATE_TAINTED)) { + if (cs_debug) + printf("CODE SIGNING: %s[%d]: invalid initial page at offset %lld validated:%d tainted:%d csflags:0x%x\n", + vp->v_name, p->p_pid, (long long)(file_offset + off), valid, tainted, result->csflags); + if (cs_enforcement(NULL) || + (result->csflags & (CS_HARD|CS_KILL|CS_ENFORCEMENT))) { + ret = LOAD_FAILURE; + } + result->csflags &= ~CS_VALID; + } + off += PAGE_SIZE; + } + } + + break; +#if CONFIG_CODE_DECRYPTION + case LC_ENCRYPTION_INFO: + case LC_ENCRYPTION_INFO_64: + if (pass != 3) + break; + ret = set_code_unprotect( + (struct encryption_info_command *) lcp, + addr, map, slide, vp, file_offset, + header->cputype, header->cpusubtype); + if (ret != LOAD_SUCCESS) { + printf("proc %d: set_code_unprotect() error %d " + "for file \"%s\"\n", + p->p_pid, ret, vp->v_name); + /* + * Don't let the app run if it's + * encrypted but we failed to set up the + * decrypter. If the keys are missing it will + * return LOAD_DECRYPTFAIL. + */ + if (ret == LOAD_DECRYPTFAIL) { + /* failed to load due to missing FP keys */ + proc_lock(p); + p->p_lflag |= P_LTERM_DECRYPTFAIL; + proc_unlock(p); + } + psignal(p, SIGKILL); + } + break; +#endif default: /* Other commands are ignored by the kernel */ ret = LOAD_SUCCESS; @@ -540,155 +874,72 @@ parse_machfile( if (ret != LOAD_SUCCESS) break; } - if (ret == LOAD_SUCCESS) { - if (shared_regions) { - vm_offset_t vmaddr; - shared_region_mapping_t shared_region; - struct shared_region_task_mappings map_info; - shared_region_mapping_t next; - -RedoLookup: - vm_get_shared_region(task, &shared_region); - map_info.self = (vm_offset_t)shared_region; - shared_region_mapping_info(shared_region, - &(map_info.text_region), - &(map_info.text_size), - &(map_info.data_region), - &(map_info.data_size), - &(map_info.region_mappings), - &(map_info.client_base), - &(map_info.alternate_base), - &(map_info.alternate_next), - &(map_info.fs_base), - &(map_info.system), - &(map_info.flags), &next); - - if((map_info.flags & SHARED_REGION_FULL) || - (map_info.flags & SHARED_REGION_STALE)) { - shared_region_mapping_t system_region; - system_region = lookup_default_shared_region( - map_info.fs_base, map_info.system); - if((map_info.self != (vm_offset_t)system_region) && - (map_info.flags & SHARED_REGION_SYSTEM)) { - if(system_region == NULL) { - shared_file_boot_time_init( - map_info.fs_base, map_info.system); - } else { - vm_set_shared_region(task, system_region); - } - shared_region_mapping_dealloc( - (shared_region_mapping_t)map_info.self); - goto RedoLookup; - } else if (map_info.flags & SHARED_REGION_SYSTEM) { - shared_region_mapping_dealloc(system_region); - shared_file_boot_time_init( - map_info.fs_base, map_info.system); - shared_region_mapping_dealloc( - (shared_region_mapping_t)map_info.self); + if (ret == LOAD_SUCCESS) { + if (! got_code_signatures) { + if (cs_enforcement(NULL)) { + ret = LOAD_FAILURE; } else { - shared_region_mapping_dealloc(system_region); + /* + * No embedded signatures: look for detached by taskgated, + * this is only done on OSX, on embedded platforms we expect everything + * to be have embedded signatures. + */ + struct cs_blob *blob; + + blob = ubc_cs_blob_get(vp, -1, file_offset); + if (blob != NULL) { + unsigned int cs_flag_data = blob->csb_flags; + if(0 != ubc_cs_generation_check(vp)) { + if (0 != ubc_cs_blob_revalidate(vp, blob, 0)) { + /* clear out the flag data if revalidation fails */ + cs_flag_data = 0; + result->csflags &= ~CS_VALID; + } + } + /* get flags to be applied to the process */ + result->csflags |= cs_flag_data; + } } } - if (dylink_test) { - p->p_flag |= P_NOSHLIB; /* no shlibs in use */ - vmaddr = map_info.client_base; - if(clean_regions) { - vm_map(map, &vmaddr, map_info.text_size, - 0, SHARED_LIB_ALIAS|VM_FLAGS_FIXED, - map_info.text_region, 0, FALSE, - VM_PROT_READ, VM_PROT_READ, VM_INHERIT_SHARE); - } else { - vm_map(map, &vmaddr, map_info.text_size, 0, - (VM_MEMORY_SHARED_PMAP << 24) - | SHARED_LIB_ALIAS | VM_FLAGS_FIXED, - map_info.text_region, 0, FALSE, - VM_PROT_READ, VM_PROT_READ, VM_INHERIT_SHARE); - } - vmaddr = map_info.client_base + map_info.text_size; - vm_map(map, &vmaddr, map_info.data_size, - 0, SHARED_LIB_ALIAS | VM_FLAGS_FIXED, - map_info.data_region, 0, TRUE, - VM_PROT_READ, VM_PROT_READ, VM_INHERIT_SHARE); - - while (next) { - /* this should be fleshed out for the general case */ - /* but this is not necessary for now. Indeed we */ - /* are handling the com page inside of the */ - /* shared_region mapping create calls for now for */ - /* simplicities sake. If more general support is */ - /* needed the code to manipulate the shared range */ - /* chain can be pulled out and moved to the callers*/ - shared_region_mapping_info(next, - &(map_info.text_region), - &(map_info.text_size), - &(map_info.data_region), - &(map_info.data_size), - &(map_info.region_mappings), - &(map_info.client_base), - &(map_info.alternate_base), - &(map_info.alternate_next), - &(map_info.fs_base), - &(map_info.system), - &(map_info.flags), &next); - - vmaddr = map_info.client_base; - vm_map(map, &vmaddr, map_info.text_size, - 0, SHARED_LIB_ALIAS | VM_FLAGS_FIXED, - map_info.text_region, 0, FALSE, - VM_PROT_READ, VM_PROT_READ, VM_INHERIT_SHARE); - } + /* Make sure if we need dyld, we got it */ + if (result->needs_dynlinker && !dlp) { + ret = LOAD_FAILURE; } - } - if (dlp != 0) - ret = load_dylinker(dlp, dlarchbits, map, thr_act, depth, result, clean_regions, abi64); - if(depth == 1) { - if (result->thread_count == 0) - ret = LOAD_FAILURE; - else if ( abi64 ) { - /* Map in 64-bit commpage */ - /* LP64todo - make this clean */ - pmap_map_sharedpage(current_task(), get_map_pmap(map)); - vm_map_commpage64(map); - } else { -#ifdef __i386__ + if ((ret == LOAD_SUCCESS) && (dlp != 0)) { /* - * On Intel, the comm page doesn't get mapped - * automatically because it goes beyond the current end - * of the VM map in the current 3GB/1GB address space - * model. - * XXX This will probably become unnecessary when we - * switch to the 4GB/4GB address space model. + * load the dylinker, and slide it by the independent DYLD ASLR + * offset regardless of the PIE-ness of the main binary. */ - vm_map_commpage32(map); -#endif /* __i386__ */ + ret = load_dylinker(dlp, dlarchbits, map, thread, depth, + dyld_aslr_offset, result); } + + if((ret == LOAD_SUCCESS) && (depth == 1)) { + if (result->thread_count == 0) { + ret = LOAD_FAILURE; + } } } if (kl_addr ) kfree(kl_addr, kl_size); - if (ret == LOAD_SUCCESS) - (void)ubc_map(vp, PROT_EXEC); - return(ret); } -#ifndef SG_PROTECTED_VERSION_1 -#define SG_PROTECTED_VERSION_1 0x8 -#endif /* SG_PROTECTED_VERSION_1 */ - -#ifdef __i386__ +#if CONFIG_CODE_DECRYPTION -#define APPLE_UNPROTECTED_HEADER_SIZE (3 * PAGE_SIZE_64) +#define APPLE_UNPROTECTED_HEADER_SIZE (3 * 4096) static load_return_t -unprotect_segment_64( +unprotect_dsmos_segment( uint64_t file_off, uint64_t file_size, + struct vnode *vp, + off_t macho_offset, vm_map_t map, vm_map_offset_t map_addr, vm_map_size_t map_size) @@ -718,9 +969,35 @@ unprotect_segment_64( map_size -= delta; } /* ... transform the rest of the mapping. */ + struct pager_crypt_info crypt_info; + crypt_info.page_decrypt = dsmos_page_transform; + crypt_info.crypt_ops = NULL; + crypt_info.crypt_end = NULL; +#pragma unused(vp, macho_offset) + crypt_info.crypt_ops = (void *)0x2e69cf40; + vm_map_offset_t crypto_backing_offset; + crypto_backing_offset = -1; /* i.e. use map entry's offset */ +#if DEVELOPMENT || DEBUG + struct proc *p; + p = current_proc(); + printf("APPLE_PROTECT: %d[%s] map %p [0x%llx:0x%llx] %s(%s)\n", + p->p_pid, p->p_comm, map, + (uint64_t) map_addr, (uint64_t) (map_addr + map_size), + __FUNCTION__, vp->v_name); +#endif /* DEVELOPMENT || DEBUG */ + + /* The DSMOS pager can only be used by apple signed code */ + struct cs_blob * blob = csvnode_get_blob(vp, file_off); + if( blob == NULL || !blob->csb_platform_binary || blob->csb_platform_path) + { + return LOAD_FAILURE; + } + kr = vm_map_apple_protected(map, map_addr, - map_addr + map_size); + map_addr + map_size, + crypto_backing_offset, + &crypt_info); } if (kr != KERN_SUCCESS) { @@ -728,52 +1005,274 @@ unprotect_segment_64( } return LOAD_SUCCESS; } -#else /* __i386__ */ -#define unprotect_segment_64(file_off, file_size, map, map_addr, map_size) \ - LOAD_SUCCESS -#endif /* __i386__ */ +#else /* CONFIG_CODE_DECRYPTION */ +static load_return_t +unprotect_dsmos_segment( + __unused uint64_t file_off, + __unused uint64_t file_size, + __unused struct vnode *vp, + __unused off_t macho_offset, + __unused vm_map_t map, + __unused vm_map_offset_t map_addr, + __unused vm_map_size_t map_size) +{ + return LOAD_SUCCESS; +} +#endif /* CONFIG_CODE_DECRYPTION */ + + +/* + * map_segment: + * Maps a Mach-O segment, taking care of mis-alignment (wrt the system + * page size) issues. + * + * The mapping might result in 1, 2 or 3 map entries: + * 1. for the first page, which could be overlap with the previous + * mapping, + * 2. for the center (if applicable), + * 3. for the last page, which could overlap with the next mapping. + * + * For each of those map entries, we might have to interpose a + * "fourk_pager" to deal with mis-alignment wrt the system page size, + * either in the mapping address and/or size or the file offset and/or + * size. + * The "fourk_pager" itself would be mapped with proper alignment + * wrt the system page size and would then be populated with the + * information about the intended mapping, with a "4KB" granularity. + */ +static kern_return_t +map_segment( + vm_map_t map, + vm_map_offset_t vm_start, + vm_map_offset_t vm_end, + memory_object_control_t control, + vm_map_offset_t file_start, + vm_map_offset_t file_end, + vm_prot_t initprot, + vm_prot_t maxprot) +{ + int extra_vm_flags, cur_extra_vm_flags; + vm_map_offset_t cur_offset, cur_start, cur_end; + kern_return_t ret; + vm_map_offset_t effective_page_mask; + + if (vm_end < vm_start || + file_end < file_start) { + return LOAD_BADMACHO; + } + if (vm_end == vm_start || + file_end == file_start) { + /* nothing to map... */ + return LOAD_SUCCESS; + } + + effective_page_mask = MAX(PAGE_MASK, vm_map_page_mask(map)); + + extra_vm_flags = 0; + if (vm_map_page_aligned(vm_start, effective_page_mask) && + vm_map_page_aligned(vm_end, effective_page_mask) && + vm_map_page_aligned(file_start, effective_page_mask) && + vm_map_page_aligned(file_end, effective_page_mask)) { + /* all page-aligned and map-aligned: proceed */ + } else { + panic("map_segment: unexpected mis-alignment " + "vm[0x%llx:0x%llx] file[0x%llx:0x%llx]\n", + (uint64_t) vm_start, + (uint64_t) vm_end, + (uint64_t) file_start, + (uint64_t) file_end); + } + + cur_offset = 0; + cur_start = vm_start; + cur_end = vm_start; + if (cur_end >= vm_start + (file_end - file_start)) { + /* all mapped: done */ + goto done; + } + if (vm_map_round_page(cur_end, effective_page_mask) >= + vm_map_trunc_page(vm_start + (file_end - file_start), + effective_page_mask)) { + /* no middle */ + } else { + cur_start = cur_end; + if ((vm_start & effective_page_mask) != + (file_start & effective_page_mask)) { + /* one 4K pager for the middle */ + cur_extra_vm_flags = extra_vm_flags; + } else { + /* regular mapping for the middle */ + cur_extra_vm_flags = 0; + } + cur_end = vm_map_trunc_page(vm_start + (file_end - + file_start), + effective_page_mask); + if (control != MEMORY_OBJECT_CONTROL_NULL) { + ret = vm_map_enter_mem_object_control( + map, + &cur_start, + cur_end - cur_start, + (mach_vm_offset_t)0, + VM_FLAGS_FIXED | cur_extra_vm_flags, + control, + file_start + cur_offset, + TRUE, /* copy */ + initprot, maxprot, + VM_INHERIT_DEFAULT); + } else { + ret = vm_map_enter_mem_object( + map, + &cur_start, + cur_end - cur_start, + (mach_vm_offset_t)0, + VM_FLAGS_FIXED | cur_extra_vm_flags, + IPC_PORT_NULL, + 0, /* offset */ + TRUE, /* copy */ + initprot, maxprot, + VM_INHERIT_DEFAULT); + } + if (ret != KERN_SUCCESS) { + return (LOAD_NOSPACE); + } + cur_offset += cur_end - cur_start; + } + if (cur_end >= vm_start + (file_end - file_start)) { + /* all mapped: done */ + goto done; + } + cur_start = cur_end; +done: + assert(cur_end >= vm_start + (file_end - file_start)); + return LOAD_SUCCESS; +} static load_return_t load_segment( - struct segment_command *scp, - void * pager, + struct load_command *lcp, + uint32_t filetype, + void * control, off_t pager_offset, off_t macho_size, - __unused off_t end_of_file, + struct vnode *vp, vm_map_t map, - load_result_t *result -) + int64_t slide, + load_result_t *result) { + struct segment_command_64 segment_command, *scp; kern_return_t ret; - vm_offset_t map_addr, map_offset; - vm_size_t map_size, seg_size, delta_size; + vm_map_size_t delta_size; vm_prot_t initprot; vm_prot_t maxprot; + size_t segment_command_size, total_section_size, + single_section_size; + vm_map_offset_t file_offset, file_size; + vm_map_offset_t vm_offset, vm_size; + vm_map_offset_t vm_start, vm_end, vm_end_aligned; + vm_map_offset_t file_start, file_end; + kern_return_t kr; + boolean_t verbose; + vm_map_size_t effective_page_size; + vm_map_offset_t effective_page_mask; + + effective_page_size = MAX(PAGE_SIZE, vm_map_page_size(map)); + effective_page_mask = MAX(PAGE_MASK, vm_map_page_mask(map)); + + verbose = FALSE; + if (LC_SEGMENT_64 == lcp->cmd) { + segment_command_size = sizeof(struct segment_command_64); + single_section_size = sizeof(struct section_64); + } else { + segment_command_size = sizeof(struct segment_command); + single_section_size = sizeof(struct section); + } + if (lcp->cmdsize < segment_command_size) + return (LOAD_BADMACHO); + total_section_size = lcp->cmdsize - segment_command_size; + + if (LC_SEGMENT_64 == lcp->cmd) { + scp = (struct segment_command_64 *)lcp; + } else { + scp = &segment_command; + widen_segment_command((struct segment_command *)lcp, scp); + } + + if (verbose) { + MACHO_PRINTF(("+++ load_segment %s " + "vm[0x%llx:0x%llx] file[0x%llx:0x%llx] " + "prot %d/%d flags 0x%x\n", + scp->segname, + (uint64_t)(slide + scp->vmaddr), + (uint64_t)(slide + scp->vmaddr + scp->vmsize), + pager_offset + scp->fileoff, + pager_offset + scp->fileoff + scp->filesize, + scp->initprot, + scp->maxprot, + scp->flags)); + } /* * Make sure what we get from the file is really ours (as specified * by macho_size). */ - if (scp->fileoff + scp->filesize > macho_size) + if (scp->fileoff + scp->filesize < scp->fileoff || + scp->fileoff + scp->filesize > (uint64_t)macho_size) { return (LOAD_BADMACHO); - - seg_size = round_page(scp->vmsize); - if (seg_size == 0) - return(KERN_SUCCESS); + } + /* + * Ensure that the number of sections specified would fit + * within the load command size. + */ + if (total_section_size / single_section_size < scp->nsects) { + return (LOAD_BADMACHO); + } + /* + * Make sure the segment is page-aligned in the file. + */ + file_offset = pager_offset + scp->fileoff; /* limited to 32 bits */ + file_size = scp->filesize; + if ((file_offset & PAGE_MASK_64) != 0 || + /* we can't mmap() it if it's not page-aligned in the file */ + (file_offset & vm_map_page_mask(map)) != 0) { + /* + * The 1st test would have failed if the system's page size + * was what this process believe is the page size, so let's + * fail here too for the sake of consistency. + */ + return (LOAD_BADMACHO); + } /* - * Round sizes to page size. + * If we have a code signature attached for this slice + * require that the segments are within the signed part + * of the file. */ - map_size = round_page(scp->filesize); - map_addr = trunc_page(scp->vmaddr); + if (result->cs_end_offset && + result->cs_end_offset < (off_t)scp->fileoff && + result->cs_end_offset - scp->fileoff < scp->filesize) + { + if (cs_debug) + printf("section outside code signature\n"); + return LOAD_BADMACHO; + } + + vm_offset = scp->vmaddr + slide; + vm_size = scp->vmsize; -#if 0 /* XXX (4596982) this interferes with Rosetta */ - if (map_addr == 0 && - map_size == 0 && - seg_size != 0 && + if (vm_size == 0) + return (LOAD_SUCCESS); + if (scp->vmaddr == 0 && + file_size == 0 && + vm_size != 0 && (scp->initprot & VM_PROT_ALL) == VM_PROT_NONE && (scp->maxprot & VM_PROT_ALL) == VM_PROT_NONE) { + /* + * For PIE, extend page zero rather than moving it. Extending + * page zero keeps early allocations from falling predictably + * between the end of page zero and the beginning of the first + * slid segment. + */ /* * This is a "page zero" segment: it starts at address 0, * is not mapped from the binary file and is not accessible. @@ -781,51 +1280,98 @@ load_segment( * make it completely off limits by raising the VM map's * minimum offset. */ - ret = vm_map_raise_min_offset(map, (vm_map_offset_t) seg_size); + vm_end = vm_offset + vm_size; + if (vm_end < vm_offset) { + return (LOAD_BADMACHO); + } + if (verbose) { + MACHO_PRINTF(("++++++ load_segment: " + "page_zero up to 0x%llx\n", + (uint64_t) vm_end)); + } + { + vm_end = vm_map_round_page(vm_end, + PAGE_MASK_64); + vm_end_aligned = vm_end; + } + ret = vm_map_raise_min_offset(map, + vm_end_aligned); + if (ret != KERN_SUCCESS) { - return LOAD_FAILURE; + return (LOAD_FAILURE); } - return LOAD_SUCCESS; + return (LOAD_SUCCESS); + } else { } -#endif - map_offset = pager_offset + scp->fileoff; + { + file_start = vm_map_trunc_page(file_offset, + effective_page_mask); + file_end = vm_map_round_page(file_offset + file_size, + effective_page_mask); + vm_start = vm_map_trunc_page(vm_offset, + effective_page_mask); + vm_end = vm_map_round_page(vm_offset + vm_size, + effective_page_mask); + } + + if (vm_start < result->min_vm_addr) + result->min_vm_addr = vm_start; + if (vm_end > result->max_vm_addr) + result->max_vm_addr = vm_end; + + if (map == VM_MAP_NULL) + return (LOAD_SUCCESS); - if (map_size > 0) { + if (vm_size > 0) { initprot = (scp->initprot) & VM_PROT_ALL; maxprot = (scp->maxprot) & VM_PROT_ALL; /* * Map a copy of the file into the address space. */ - ret = vm_map(map, - &map_addr, map_size, (vm_offset_t)0, - VM_FLAGS_FIXED, pager, map_offset, TRUE, - initprot, maxprot, - VM_INHERIT_DEFAULT); - if (ret != KERN_SUCCESS) - return(LOAD_NOSPACE); - + if (verbose) { + MACHO_PRINTF(("++++++ load_segment: " + "mapping at vm [0x%llx:0x%llx] of " + "file [0x%llx:0x%llx]\n", + (uint64_t) vm_start, + (uint64_t) vm_end, + (uint64_t) file_start, + (uint64_t) file_end)); + } + ret = map_segment(map, + vm_start, + vm_end, + control, + file_start, + file_end, + initprot, + maxprot); + if (ret) { + return LOAD_NOSPACE; + } + +#if FIXME /* * If the file didn't end on a page boundary, * we need to zero the leftover. */ delta_size = map_size - scp->filesize; -#if FIXME if (delta_size > 0) { - vm_offset_t tmp; + mach_vm_offset_t tmp; - ret = vm_allocate(kernel_map, &tmp, delta_size, VM_FLAGS_ANYWHERE); - if (ret != KERN_SUCCESS) + ret = mach_vm_allocate(kernel_map, &tmp, delta_size, VM_FLAGS_ANYWHERE| VM_MAKE_TAG(VM_KERN_MEMORY_BSD)); + if (ret != KERN_SUCCESS) { return(LOAD_RESOURCE); + } if (copyout(tmp, map_addr + scp->filesize, delta_size)) { - (void) vm_deallocate( + (void) mach_vm_deallocate( kernel_map, tmp, delta_size); - return(LOAD_FAILURE); + return (LOAD_FAILURE); } - - (void) vm_deallocate(kernel_map, tmp, delta_size); + + (void) mach_vm_deallocate(kernel_map, tmp, delta_size); } #endif /* FIXME */ } @@ -835,267 +1381,222 @@ load_segment( * than the size from the file, we need to allocate * zero fill memory for the rest. */ - delta_size = seg_size - map_size; - if (delta_size > 0) { - vm_offset_t tmp = map_addr + map_size; - - ret = vm_map(map, &tmp, delta_size, 0, VM_FLAGS_FIXED, - NULL, 0, FALSE, - scp->initprot, scp->maxprot, - VM_INHERIT_DEFAULT); - if (ret != KERN_SUCCESS) + if ((vm_end - vm_start) > (file_end - file_start)) { + delta_size = (vm_end - vm_start) - (file_end - file_start); + } else { + delta_size = 0; + } + if (delta_size > 0) { + mach_vm_offset_t tmp; + + tmp = vm_start + (file_end - file_start); + if (verbose) { + MACHO_PRINTF(("++++++ load_segment: " + "delta mapping vm [0x%llx:0x%llx]\n", + (uint64_t) tmp, + (uint64_t) (tmp + delta_size))); + } + kr = map_segment(map, + tmp, + tmp + delta_size, + MEMORY_OBJECT_CONTROL_NULL, + 0, + delta_size, + scp->initprot, + scp->maxprot); + if (kr != KERN_SUCCESS) { return(LOAD_NOSPACE); + } } if ( (scp->fileoff == 0) && (scp->filesize != 0) ) - result->mach_header = map_addr; + result->mach_header = vm_offset; if (scp->flags & SG_PROTECTED_VERSION_1) { - ret = unprotect_segment_64((uint64_t) scp->fileoff, - (uint64_t) scp->filesize, - map, - (vm_map_offset_t) map_addr, - (vm_map_size_t) map_size); + ret = unprotect_dsmos_segment(file_start, + file_end - file_start, + vp, + pager_offset, + map, + vm_start, + vm_end - vm_start); + if (ret != LOAD_SUCCESS) { + return ret; + } } else { ret = LOAD_SUCCESS; } + if (LOAD_SUCCESS == ret && + filetype == MH_DYLINKER && + result->all_image_info_addr == MACH_VM_MIN_ADDRESS) { + note_all_image_info_section(scp, + LC_SEGMENT_64 == lcp->cmd, + single_section_size, + ((const char *)lcp + + segment_command_size), + slide, + result); + } + + if (result->entry_point != MACH_VM_MIN_ADDRESS) { + if ((result->entry_point >= vm_offset) && (result->entry_point < (vm_offset + vm_size))) { + if ((scp->initprot & (VM_PROT_READ|VM_PROT_EXECUTE)) == (VM_PROT_READ|VM_PROT_EXECUTE)) { + result->validentry = 1; + } else { + /* right range but wrong protections, unset if previously validated */ + result->validentry = 0; + } + } + } + return ret; } static load_return_t -load_segment_64( - struct segment_command_64 *scp64, - void * pager, - off_t pager_offset, - off_t macho_size, - __unused off_t end_of_file, - vm_map_t map, +load_uuid( + struct uuid_command *uulp, + char *command_end, load_result_t *result ) { - kern_return_t ret; - mach_vm_offset_t map_addr, map_offset; - mach_vm_size_t map_size, seg_size, delta_size; - vm_prot_t initprot; - vm_prot_t maxprot; - - /* - * Make sure what we get from the file is really ours (as specified - * by macho_size). - */ - if (scp64->fileoff + scp64->filesize > (uint64_t)macho_size) - return (LOAD_BADMACHO); - - seg_size = round_page_64(scp64->vmsize); - if (seg_size == 0) - return(KERN_SUCCESS); - - /* - * Round sizes to page size. - */ - map_size = round_page_64(scp64->filesize); /* limited to 32 bits */ - map_addr = round_page_64(scp64->vmaddr); - - if (map_addr == 0 && - map_size == 0 && - seg_size != 0 && - (scp64->initprot & VM_PROT_ALL) == VM_PROT_NONE && - (scp64->maxprot & VM_PROT_ALL) == VM_PROT_NONE) { /* - * This is a "page zero" segment: it starts at address 0, - * is not mapped from the binary file and is not accessible. - * User-space should never be able to access that memory, so - * make it completely off limits by raising the VM map's - * minimum offset. + * We need to check the following for this command: + * - The command size should be atleast the size of struct uuid_command + * - The UUID part of the command should be completely within the mach-o header */ - ret = vm_map_raise_min_offset(map, seg_size); - if (ret != KERN_SUCCESS) { - return LOAD_FAILURE; - } - return LOAD_SUCCESS; - } - map_offset = pager_offset + scp64->fileoff; /* limited to 32 bits */ - - if (map_size > 0) { - initprot = (scp64->initprot) & VM_PROT_ALL; - maxprot = (scp64->maxprot) & VM_PROT_ALL; - /* - * Map a copy of the file into the address space. - */ - ret = mach_vm_map(map, - &map_addr, map_size, (mach_vm_offset_t)0, - VM_FLAGS_FIXED, pager, map_offset, TRUE, - initprot, maxprot, - VM_INHERIT_DEFAULT); - if (ret != KERN_SUCCESS) - return(LOAD_NOSPACE); - - /* - * If the file didn't end on a page boundary, - * we need to zero the leftover. - */ - delta_size = map_size - scp64->filesize; -#if FIXME - if (delta_size > 0) { - mach_vm_offset_t tmp; - - ret = vm_allocate(kernel_map, &tmp, delta_size, VM_FLAGS_ANYWHERE); - if (ret != KERN_SUCCESS) - return(LOAD_RESOURCE); - - if (copyout(tmp, map_addr + scp64->filesize, - delta_size)) { - (void) vm_deallocate( - kernel_map, tmp, delta_size); - return (LOAD_FAILURE); - } - - (void) vm_deallocate(kernel_map, tmp, delta_size); + if ((uulp->cmdsize < sizeof(struct uuid_command)) || + (((char *)uulp + sizeof(struct uuid_command)) > command_end)) { + return (LOAD_BADMACHO); } -#endif /* FIXME */ - } - - /* - * If the virtual size of the segment is greater - * than the size from the file, we need to allocate - * zero fill memory for the rest. - */ - delta_size = seg_size - map_size; - if (delta_size > 0) { - mach_vm_offset_t tmp = map_addr + map_size; - - ret = mach_vm_map(map, &tmp, delta_size, 0, VM_FLAGS_FIXED, - NULL, 0, FALSE, - scp64->initprot, scp64->maxprot, - VM_INHERIT_DEFAULT); - if (ret != KERN_SUCCESS) - return(LOAD_NOSPACE); - } - - if ( (scp64->fileoff == 0) && (scp64->filesize != 0) ) - result->mach_header = map_addr; - - if (scp64->flags & SG_PROTECTED_VERSION_1) { - ret = unprotect_segment_64(scp64->fileoff, - scp64->filesize, - map, - map_addr, - map_size); - } else { - ret = LOAD_SUCCESS; - } - - return ret; + + memcpy(&result->uuid[0], &uulp->uuid[0], sizeof(result->uuid)); + return (LOAD_SUCCESS); } static load_return_t -load_thread( - struct thread_command *tcp, - thread_t thread, +load_main( + struct entry_point_command *epc, + thread_t thread, + int64_t slide, load_result_t *result ) { - kern_return_t kret; - load_return_t lret; - task_t task; - int customstack=0; - - task = get_threadtask(thread); - - /* if count is 0; same as thr_act */ + mach_vm_offset_t addr; + kern_return_t ret; + + if (epc->cmdsize < sizeof(*epc)) + return (LOAD_BADMACHO); if (result->thread_count != 0) { - kret = thread_create(task, &thread); - if (kret != KERN_SUCCESS) - return(LOAD_RESOURCE); - thread_deallocate(thread); + return (LOAD_FAILURE); } - lret = load_threadstate(thread, - (unsigned long *)(((vm_offset_t)tcp) + - sizeof(struct thread_command)), - tcp->cmdsize - sizeof(struct thread_command)); - if (lret != LOAD_SUCCESS) - return (lret); - - if (result->thread_count == 0) { - lret = load_threadstack(thread, - (unsigned long *)(((vm_offset_t)tcp) + - sizeof(struct thread_command)), - tcp->cmdsize - sizeof(struct thread_command), - &result->user_stack, - &customstack); - if (customstack) - result->customstack = 1; - else - result->customstack = 0; - - if (lret != LOAD_SUCCESS) - return(lret); + if (thread == THREAD_NULL) + return (LOAD_SUCCESS); + + /* LC_MAIN specifies stack size but not location */ + if (epc->stacksize) { + result->prog_stack_size = 1; + result->user_stack_size = epc->stacksize; + } else { + result->prog_stack_size = 0; + result->user_stack_size = MAXSSIZ; + } + result->prog_allocated_stack = 0; + + /* use default location for stack */ + ret = thread_userstackdefault(thread, &addr); + if (ret != KERN_SUCCESS) + return(LOAD_FAILURE); + + /* The stack slides down from the default location */ + result->user_stack = addr; + result->user_stack -= slide; - lret = load_threadentry(thread, - (unsigned long *)(((vm_offset_t)tcp) + - sizeof(struct thread_command)), - tcp->cmdsize - sizeof(struct thread_command), - &result->entry_point); - if (lret != LOAD_SUCCESS) - return(lret); + if (result->using_lcmain || result->entry_point != MACH_VM_MIN_ADDRESS) { + /* Already processed LC_MAIN or LC_UNIXTHREAD */ + return (LOAD_FAILURE); } - /* - * Resume thread now, note that this means that the thread - * commands should appear after all the load commands to - * be sure they don't reference anything not yet mapped. - */ - else - thread_resume(thread); - + + /* kernel does *not* use entryoff from LC_MAIN. Dyld uses it. */ + result->needs_dynlinker = TRUE; + result->using_lcmain = TRUE; + result->unixproc = TRUE; result->thread_count++; return(LOAD_SUCCESS); } + static load_return_t load_unixthread( struct thread_command *tcp, thread_t thread, + int64_t slide, load_result_t *result ) { load_return_t ret; int customstack =0; + mach_vm_offset_t addr; - if (result->thread_count != 0) + if (tcp->cmdsize < sizeof(*tcp)) + return (LOAD_BADMACHO); + if (result->thread_count != 0) { return (LOAD_FAILURE); + } + + if (thread == THREAD_NULL) + return (LOAD_SUCCESS); ret = load_threadstack(thread, - (unsigned long *)(((vm_offset_t)tcp) + + (uint32_t *)(((vm_offset_t)tcp) + sizeof(struct thread_command)), tcp->cmdsize - sizeof(struct thread_command), - &result->user_stack, + &addr, &customstack); if (ret != LOAD_SUCCESS) return(ret); - if (customstack) - result->customstack = 1; - else - result->customstack = 0; + /* LC_UNIXTHREAD optionally specifies stack size and location */ + + if (customstack) { + result->prog_stack_size = 0; /* unknown */ + result->prog_allocated_stack = 1; + } else { + result->prog_allocated_stack = 0; + result->prog_stack_size = 0; + result->user_stack_size = MAXSSIZ; + } + + /* The stack slides down from the default location */ + result->user_stack = addr; + result->user_stack -= slide; + ret = load_threadentry(thread, - (unsigned long *)(((vm_offset_t)tcp) + + (uint32_t *)(((vm_offset_t)tcp) + sizeof(struct thread_command)), tcp->cmdsize - sizeof(struct thread_command), - &result->entry_point); + &addr); if (ret != LOAD_SUCCESS) return(ret); + if (result->using_lcmain || result->entry_point != MACH_VM_MIN_ADDRESS) { + /* Already processed LC_MAIN or LC_UNIXTHREAD */ + return (LOAD_FAILURE); + } + + result->entry_point = addr; + result->entry_point += slide; + ret = load_threadstate(thread, - (unsigned long *)(((vm_offset_t)tcp) + - sizeof(struct thread_command)), - tcp->cmdsize - sizeof(struct thread_command)); + (uint32_t *)(((vm_offset_t)tcp) + sizeof(struct thread_command)), + tcp->cmdsize - sizeof(struct thread_command), + result); if (ret != LOAD_SUCCESS) return (ret); @@ -1109,62 +1610,83 @@ static load_return_t load_threadstate( thread_t thread, - unsigned long *ts, - unsigned long total_size + uint32_t *ts, + uint32_t total_size, + load_result_t *result ) { - kern_return_t ret; - unsigned long size; + uint32_t size; int flavor; - unsigned long thread_size; + uint32_t thread_size; + uint32_t *local_ts = NULL; + uint32_t local_ts_size = 0; + int ret; + + (void)thread; + + if (total_size > 0) { + local_ts_size = total_size; + local_ts = kalloc(local_ts_size); + if (local_ts == NULL) { + return LOAD_FAILURE; + } + memcpy(local_ts, ts, local_ts_size); + ts = local_ts; + } - ret = thread_state_initialize( thread ); - if (ret != KERN_SUCCESS) - return(LOAD_FAILURE); - /* - * Set the new thread state; iterate through the state flavors in - * the mach-o file. + * Validate the new thread state; iterate through the state flavors in + * the Mach-O file. + * XXX: we should validate the machine state here, to avoid failing at + * activation time where we can't bail out cleanly. */ while (total_size > 0) { flavor = *ts++; size = *ts++; - thread_size = (size+2)*sizeof(unsigned long); - if (thread_size > total_size) - return(LOAD_BADMACHO); - total_size -= thread_size; - /* - * Third argument is a kernel space pointer; it gets cast - * to the appropriate type in machine_thread_set_state() - * based on the value of flavor. - */ - ret = thread_setstatus(thread, flavor, (thread_state_t)ts, size); - if (ret != KERN_SUCCESS) - return(LOAD_FAILURE); - ts += size; /* ts is a (unsigned long *) */ + + if (os_add_overflow(size, UINT32_C(2), &thread_size) || + os_mul_overflow(thread_size, (uint32_t)sizeof(uint32_t), &thread_size) || + os_sub_overflow(total_size, thread_size, &total_size)) { + ret = LOAD_BADMACHO; + goto bad; + } + + ts += size; /* ts is a (uint32_t *) */ } - return(LOAD_SUCCESS); + + result->threadstate = local_ts; + result->threadstate_sz = local_ts_size; + return LOAD_SUCCESS; + +bad: + if (local_ts) { + kfree(local_ts, local_ts_size); + } + return ret; } static load_return_t load_threadstack( thread_t thread, - unsigned long *ts, - unsigned long total_size, - user_addr_t *user_stack, + uint32_t *ts, + uint32_t total_size, + mach_vm_offset_t *user_stack, int *customstack ) { kern_return_t ret; - unsigned long size; + uint32_t size; int flavor; - unsigned long stack_size; + uint32_t stack_size; while (total_size > 0) { flavor = *ts++; size = *ts++; - stack_size = (size+2)*sizeof(unsigned long); + if (UINT32_MAX-2 < size || + UINT32_MAX/sizeof(uint32_t) < size+2) + return (LOAD_BADMACHO); + stack_size = (size+2)*sizeof(uint32_t); if (stack_size > total_size) return(LOAD_BADMACHO); total_size -= stack_size; @@ -1175,9 +1697,10 @@ load_threadstack( * the value of flavor. */ ret = thread_userstack(thread, flavor, (thread_state_t)ts, size, user_stack, customstack); - if (ret != KERN_SUCCESS) + if (ret != KERN_SUCCESS) { return(LOAD_FAILURE); - ts += size; /* ts is a (unsigned long *) */ + } + ts += size; /* ts is a (uint32_t *) */ } return(LOAD_SUCCESS); } @@ -1186,15 +1709,15 @@ static load_return_t load_threadentry( thread_t thread, - unsigned long *ts, - unsigned long total_size, + uint32_t *ts, + uint32_t total_size, mach_vm_offset_t *entry_point ) { kern_return_t ret; - unsigned long size; + uint32_t size; int flavor; - unsigned long entry_size; + uint32_t entry_size; /* * Set the thread state. @@ -1203,7 +1726,10 @@ load_threadentry( while (total_size > 0) { flavor = *ts++; size = *ts++; - entry_size = (size+2)*sizeof(unsigned long); + if (UINT32_MAX-2 < size || + UINT32_MAX/sizeof(uint32_t) < size+2) + return (LOAD_BADMACHO); + entry_size = (size+2)*sizeof(uint32_t); if (entry_size > total_size) return(LOAD_BADMACHO); total_size -= entry_size; @@ -1213,39 +1739,53 @@ load_threadentry( * the value of flavor. */ ret = thread_entrypoint(thread, flavor, (thread_state_t)ts, size, entry_point); - if (ret != KERN_SUCCESS) + if (ret != KERN_SUCCESS) { return(LOAD_FAILURE); - ts += size; /* ts is a (unsigned long *) */ + } + ts += size; /* ts is a (uint32_t *) */ } return(LOAD_SUCCESS); } +struct macho_data { + struct nameidata __nid; + union macho_vnode_header { + struct mach_header mach_header; + struct fat_header fat_header; + char __pad[512]; + } __header; +}; -static -load_return_t +#define DEFAULT_DYLD_PATH "/usr/lib/dyld" + +static load_return_t load_dylinker( struct dylinker_command *lcp, integer_t archbits, vm_map_t map, - thread_t thr_act, + thread_t thread, int depth, - load_result_t *result, - boolean_t clean_regions, - boolean_t is_64bit + int64_t slide, + load_result_t *result ) { char *name; char *p; - struct vnode *vp; - struct mach_header header; - off_t file_offset; - off_t macho_size; - vm_map_t copy_map; - load_result_t myresult; + struct vnode *vp = NULLVP; /* set by get_macho_vnode() */ + struct mach_header *header; + off_t file_offset = 0; /* set by get_macho_vnode() */ + off_t macho_size = 0; /* set by get_macho_vnode() */ + load_result_t *myresult; kern_return_t ret; - vm_map_copy_t tmp; - mach_vm_offset_t dyl_start, map_addr; - mach_vm_size_t dyl_length; + struct macho_data *macho_data; + struct { + struct mach_header __header; + load_result_t __myresult; + struct macho_data __macho_data; + } *dyld_data; + + if (lcp->cmdsize < sizeof(*lcp)) + return (LOAD_BADMACHO); name = (char *)lcp + lcp->name.offset; /* @@ -1257,89 +1797,375 @@ load_dylinker( return(LOAD_BADMACHO); } while (*p++); - ret = get_macho_vnode(name, archbits, &header, &file_offset, &macho_size, &vp); +#if !(DEVELOPMENT || DEBUG) + if (0 != strcmp(name, DEFAULT_DYLD_PATH)) { + return (LOAD_BADMACHO); + } +#endif + + /* Allocate wad-of-data from heap to reduce excessively deep stacks */ + + MALLOC(dyld_data, void *, sizeof (*dyld_data), M_TEMP, M_WAITOK); + header = &dyld_data->__header; + myresult = &dyld_data->__myresult; + macho_data = &dyld_data->__macho_data; + + ret = get_macho_vnode(name, archbits, header, + &file_offset, &macho_size, macho_data, &vp); if (ret) - return (ret); - + goto novp_out; + + *myresult = load_result_null; + /* - * Load the Mach-O. - * Use a temporary map to do the work. + * First try to map dyld in directly. This should work most of + * the time since there shouldn't normally be something already + * mapped to its address. */ - copy_map = vm_map_create(pmap_create(vm_map_round_page(macho_size), - is_64bit), - get_map_min(map), get_map_max(map), TRUE); - if (VM_MAP_NULL == copy_map) { - ret = LOAD_RESOURCE; - goto out; - } - myresult = load_result_null; + ret = parse_machfile(vp, map, thread, header, file_offset, + macho_size, depth, slide, 0, myresult); - ret = parse_machfile(vp, copy_map, thr_act, &header, - file_offset, macho_size, - FALSE, clean_regions, depth, &myresult); + /* + * If it turned out something was in the way, then we'll take + * take this longer path to preflight dyld's vm ranges, then + * map it at a free location in the address space. + */ - if (ret) - goto out; + if (ret == LOAD_NOSPACE) { + mach_vm_offset_t dyl_start, map_addr; + mach_vm_size_t dyl_length; + int64_t slide_amount; - if (get_map_nentries(copy_map) > 0) { + *myresult = load_result_null; - dyl_start = mach_get_vm_start(copy_map); - dyl_length = mach_get_vm_end(copy_map) - dyl_start; + /* + * Preflight parsing the Mach-O file with a NULL + * map, which will return the ranges needed for a + * subsequent map attempt (with a slide) in "myresult" + */ + ret = parse_machfile(vp, VM_MAP_NULL, THREAD_NULL, header, + file_offset, macho_size, depth, + 0 /* slide */, 0, myresult); - map_addr = dyl_start; - ret = mach_vm_allocate(map, &map_addr, dyl_length, VM_FLAGS_FIXED); - if (ret != KERN_SUCCESS) { - ret = mach_vm_allocate(map, &map_addr, dyl_length, VM_FLAGS_ANYWHERE); + if (ret != LOAD_SUCCESS) { + goto out; } + dyl_start = myresult->min_vm_addr; + dyl_length = myresult->max_vm_addr - myresult->min_vm_addr; + + dyl_length += slide; + + /* To find an appropriate load address, do a quick allocation */ + map_addr = dyl_start; + ret = mach_vm_allocate(map, &map_addr, dyl_length, VM_FLAGS_ANYWHERE); if (ret != KERN_SUCCESS) { ret = LOAD_NOSPACE; goto out; - } - ret = vm_map_copyin(copy_map, - (vm_map_address_t)dyl_start, - (vm_map_size_t)dyl_length, - TRUE, &tmp); + + ret = mach_vm_deallocate(map, map_addr, dyl_length); if (ret != KERN_SUCCESS) { - (void) vm_map_remove(map, - vm_map_trunc_page(map_addr), - vm_map_round_page(map_addr + dyl_length), - VM_MAP_NO_FLAGS); + ret = LOAD_NOSPACE; goto out; } + + if (map_addr < dyl_start) + slide_amount = -(int64_t)(dyl_start - map_addr); + else + slide_amount = (int64_t)(map_addr - dyl_start); - ret = vm_map_copy_overwrite(map, - (vm_map_address_t)map_addr, - tmp, FALSE); - if (ret != KERN_SUCCESS) { - vm_map_copy_discard(tmp); - (void) vm_map_remove(map, - vm_map_trunc_page(map_addr), - vm_map_round_page(map_addr + dyl_length), - VM_MAP_NO_FLAGS); + slide_amount += slide; + + *myresult = load_result_null; + + ret = parse_machfile(vp, map, thread, header, + file_offset, macho_size, depth, + slide_amount, 0, myresult); + + if (ret) { goto out; } + } + + if (ret == LOAD_SUCCESS) { + if (result->threadstate) { + /* don't use the app's threadstate if we have a dyld */ + kfree(result->threadstate, result->threadstate_sz); + } + result->threadstate = myresult->threadstate; + result->threadstate_sz = myresult->threadstate_sz; - if (map_addr != dyl_start) - myresult.entry_point += (map_addr - dyl_start); - } else - ret = LOAD_FAILURE; - - if (ret == LOAD_SUCCESS) { result->dynlinker = TRUE; - result->entry_point = myresult.entry_point; - (void)ubc_map(vp, PROT_EXEC); + result->entry_point = myresult->entry_point; + result->validentry = myresult->validentry; + result->all_image_info_addr = myresult->all_image_info_addr; + result->all_image_info_size = myresult->all_image_info_size; + if (myresult->platform_binary) { + result->csflags |= CS_DYLD_PLATFORM; + } } out: - vm_map_deallocate(copy_map); - vnode_put(vp); +novp_out: + FREE(dyld_data, M_TEMP); return (ret); } +static load_return_t +load_code_signature( + struct linkedit_data_command *lcp, + struct vnode *vp, + off_t macho_offset, + off_t macho_size, + cpu_type_t cputype, + load_result_t *result) +{ + int ret; + kern_return_t kr; + vm_offset_t addr; + int resid; + struct cs_blob *blob; + int error; + vm_size_t blob_size; + + addr = 0; + blob = NULL; + + if (lcp->cmdsize != sizeof (struct linkedit_data_command) || + lcp->dataoff + lcp->datasize > macho_size) { + ret = LOAD_BADMACHO; + goto out; + } + + blob = ubc_cs_blob_get(vp, cputype, macho_offset); + if (blob != NULL) { + /* we already have a blob for this vnode and cputype */ + if (blob->csb_cpu_type == cputype && + blob->csb_base_offset == macho_offset && + blob->csb_mem_size == lcp->datasize) { + /* it matches the blob we want here, lets verify the version */ + if(0 != ubc_cs_generation_check(vp)) { + if (0 != ubc_cs_blob_revalidate(vp, blob, 0)) { + ret = LOAD_FAILURE; /* set error same as from ubc_cs_blob_add */ + goto out; + } + } + ret = LOAD_SUCCESS; + } else { + /* the blob has changed for this vnode: fail ! */ + ret = LOAD_BADMACHO; + } + goto out; + } + + blob_size = lcp->datasize; + kr = ubc_cs_blob_allocate(&addr, &blob_size); + if (kr != KERN_SUCCESS) { + ret = LOAD_NOSPACE; + goto out; + } + + resid = 0; + error = vn_rdwr(UIO_READ, + vp, + (caddr_t) addr, + lcp->datasize, + macho_offset + lcp->dataoff, + UIO_SYSSPACE, + 0, + kauth_cred_get(), + &resid, + current_proc()); + if (error || resid != 0) { + ret = LOAD_IOERROR; + goto out; + } + + if (ubc_cs_blob_add(vp, + cputype, + macho_offset, + addr, + lcp->datasize, + 0, + &blob)) { + ret = LOAD_FAILURE; + goto out; + } else { + /* ubc_cs_blob_add() has consumed "addr" */ + addr = 0; + } + +#if CHECK_CS_VALIDATION_BITMAP + ubc_cs_validation_bitmap_allocate( vp ); +#endif + + ret = LOAD_SUCCESS; +out: + if (ret == LOAD_SUCCESS) { + if (blob == NULL) + panic("sucess, but no blob!"); + + result->csflags |= blob->csb_flags; + result->platform_binary = blob->csb_platform_binary; + result->cs_end_offset = blob->csb_end_offset; + } + if (addr != 0) { + ubc_cs_blob_deallocate(addr, blob_size); + addr = 0; + } + + return ret; +} + + +#if CONFIG_CODE_DECRYPTION + +static load_return_t +set_code_unprotect( + struct encryption_info_command *eip, + caddr_t addr, + vm_map_t map, + int64_t slide, + struct vnode *vp, + off_t macho_offset, + cpu_type_t cputype, + cpu_subtype_t cpusubtype) +{ + int error, len; + pager_crypt_info_t crypt_info; + const char * cryptname = 0; + char *vpath; + + size_t offset; + struct segment_command_64 *seg64; + struct segment_command *seg32; + vm_map_offset_t map_offset, map_size; + vm_object_offset_t crypto_backing_offset; + kern_return_t kr; + + if (eip->cmdsize < sizeof(*eip)) return LOAD_BADMACHO; + + switch(eip->cryptid) { + case 0: + /* not encrypted, just an empty load command */ + return LOAD_SUCCESS; + case 1: + cryptname="com.apple.unfree"; + break; + case 0x10: + /* some random cryptid that you could manually put into + * your binary if you want NULL */ + cryptname="com.apple.null"; + break; + default: + return LOAD_BADMACHO; + } + + if (map == VM_MAP_NULL) return (LOAD_SUCCESS); + if (NULL == text_crypter_create) return LOAD_FAILURE; + + MALLOC_ZONE(vpath, char *, MAXPATHLEN, M_NAMEI, M_WAITOK); + if(vpath == NULL) return LOAD_FAILURE; + + len = MAXPATHLEN; + error = vn_getpath(vp, vpath, &len); + if (error) { + FREE_ZONE(vpath, MAXPATHLEN, M_NAMEI); + return LOAD_FAILURE; + } + + /* set up decrypter first */ + crypt_file_data_t crypt_data = { + .filename = vpath, + .cputype = cputype, + .cpusubtype = cpusubtype}; + kr=text_crypter_create(&crypt_info, cryptname, (void*)&crypt_data); +#if DEVELOPMENT || DEBUG + struct proc *p; + p = current_proc(); + printf("APPLE_PROTECT: %d[%s] map %p %s(%s) -> 0x%x\n", + p->p_pid, p->p_comm, map, __FUNCTION__, vpath, kr); +#endif /* DEVELOPMENT || DEBUG */ + FREE_ZONE(vpath, MAXPATHLEN, M_NAMEI); + + if(kr) { + printf("set_code_unprotect: unable to create decrypter %s, kr=%d\n", + cryptname, kr); + if (kr == kIOReturnNotPrivileged) { + /* text encryption returned decryption failure */ + return(LOAD_DECRYPTFAIL); + }else + return LOAD_RESOURCE; + } + + /* this is terrible, but we have to rescan the load commands to find the + * virtual address of this encrypted stuff. This code is gonna look like + * the dyld source one day... */ + struct mach_header *header = (struct mach_header *)addr; + size_t mach_header_sz = sizeof(struct mach_header); + if (header->magic == MH_MAGIC_64 || + header->magic == MH_CIGAM_64) { + mach_header_sz = sizeof(struct mach_header_64); + } + offset = mach_header_sz; + uint32_t ncmds = header->ncmds; + while (ncmds--) { + /* + * Get a pointer to the command. + */ + struct load_command *lcp = (struct load_command *)(addr + offset); + offset += lcp->cmdsize; + + switch(lcp->cmd) { + case LC_SEGMENT_64: + seg64 = (struct segment_command_64 *)lcp; + if ((seg64->fileoff <= eip->cryptoff) && + (seg64->fileoff+seg64->filesize >= + eip->cryptoff+eip->cryptsize)) { + map_offset = seg64->vmaddr + eip->cryptoff - seg64->fileoff + slide; + map_size = eip->cryptsize; + crypto_backing_offset = macho_offset + eip->cryptoff; + goto remap_now; + } + case LC_SEGMENT: + seg32 = (struct segment_command *)lcp; + if ((seg32->fileoff <= eip->cryptoff) && + (seg32->fileoff+seg32->filesize >= + eip->cryptoff+eip->cryptsize)) { + map_offset = seg32->vmaddr + eip->cryptoff - seg32->fileoff + slide; + map_size = eip->cryptsize; + crypto_backing_offset = macho_offset + eip->cryptoff; + goto remap_now; + } + } + } + + /* if we get here, did not find anything */ + return LOAD_BADMACHO; + +remap_now: + /* now remap using the decrypter */ + MACHO_PRINTF(("+++ set_code_unprotect: vm[0x%llx:0x%llx]\n", + (uint64_t) map_offset, + (uint64_t) (map_offset+map_size))); + kr = vm_map_apple_protected(map, + map_offset, + map_offset+map_size, + crypto_backing_offset, + &crypt_info); + if (kr) { + printf("set_code_unprotect(): mapping failed with %x\n", kr); + return LOAD_PROTECT; + } + + return LOAD_SUCCESS; +} + +#endif + /* * This routine exists to support the load_dylinker(). * @@ -1354,44 +2180,46 @@ get_macho_vnode( struct mach_header *mach_header, off_t *file_offset, off_t *macho_size, + struct macho_data *data, struct vnode **vpp ) { struct vnode *vp; - struct vfs_context context; - struct nameidata nid, *ndp; - struct proc *p = current_proc(); /* XXXX */ + vfs_context_t ctx = vfs_context_current(); + proc_t p = vfs_context_proc(ctx); + kauth_cred_t kerncred; + struct nameidata *ndp = &data->__nid; boolean_t is_fat; struct fat_arch fat_arch; - int error = LOAD_SUCCESS; + int error; int resid; - union { - struct mach_header mach_header; - struct fat_header fat_header; - char pad[512]; - } header; + union macho_vnode_header *header = &data->__header; off_t fsize = (off_t)0; - struct ucred *cred = kauth_cred_get(); - int err2; - - context.vc_proc = p; - context.vc_ucred = cred; - ndp = &nid; - + /* + * Capture the kernel credential for use in the actual read of the + * file, since the user doing the execution may have execute rights + * but not read rights, but to exec something, we have to either map + * or read it into the new process address space, which requires + * read rights. This is to deal with lack of common credential + * serialization code which would treat NOCRED as "serialize 'root'". + */ + kerncred = vfs_context_ucred(vfs_context_kernel()); + /* init the namei data to point the file user's program name */ - NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE32, CAST_USER_ADDR_T(path), &context); + NDINIT(ndp, LOOKUP, OP_OPEN, FOLLOW | LOCKLEAF, UIO_SYSSPACE, CAST_USER_ADDR_T(path), ctx); if ((error = namei(ndp)) != 0) { - if (error == ENOENT) + if (error == ENOENT) { error = LOAD_ENOENT; - else + } else { error = LOAD_FAILURE; + } return(error); } nameidone(ndp); vp = ndp->ni_vp; - + /* check for regular file */ if (vp->v_type != VREG) { error = LOAD_PROTECT; @@ -1399,7 +2227,7 @@ get_macho_vnode( } /* get size */ - if ((error = vnode_size(vp, &fsize, &context)) != 0) { + if ((error = vnode_size(vp, &fsize, ctx)) != 0) { error = LOAD_FAILURE; goto bad1; } @@ -1411,58 +2239,75 @@ get_macho_vnode( } /* check access */ - if ((error = vnode_authorize(vp, NULL, KAUTH_VNODE_EXECUTE, &context)) != 0) { + if ((error = vnode_authorize(vp, NULL, KAUTH_VNODE_EXECUTE | KAUTH_VNODE_READ_DATA, ctx)) != 0) { error = LOAD_PROTECT; goto bad1; } /* try to open it */ - if ((error = VNOP_OPEN(vp, FREAD, &context)) != 0) { + if ((error = VNOP_OPEN(vp, FREAD, ctx)) != 0) { error = LOAD_PROTECT; goto bad1; } - if ((error = vn_rdwr(UIO_READ, vp, (caddr_t)&header, sizeof(header), 0, - UIO_SYSSPACE32, IO_NODELOCKED, cred, &resid, p)) != 0) { + if ((error = vn_rdwr(UIO_READ, vp, (caddr_t)header, sizeof (*header), 0, + UIO_SYSSPACE, IO_NODELOCKED, kerncred, &resid, p)) != 0) { error = LOAD_IOERROR; goto bad2; } - - if (header.mach_header.magic == MH_MAGIC || - header.mach_header.magic == MH_MAGIC_64) - is_fat = FALSE; - else if (header.fat_header.magic == FAT_MAGIC || - header.fat_header.magic == FAT_CIGAM) + + if (resid) { + error = LOAD_BADMACHO; + goto bad2; + } + + if (header->mach_header.magic == MH_MAGIC || + header->mach_header.magic == MH_MAGIC_64) { + is_fat = FALSE; + } else if (OSSwapBigToHostInt32(header->fat_header.magic) == FAT_MAGIC) { is_fat = TRUE; - else { - error = LOAD_BADMACHO; - goto bad2; + } else { + error = LOAD_BADMACHO; + goto bad2; } if (is_fat) { + + error = fatfile_validate_fatarches((vm_offset_t)(&header->fat_header), + sizeof(*header)); + if (error != LOAD_SUCCESS) { + goto bad2; + } + /* Look up our architecture in the fat file. */ - error = fatfile_getarch_with_bits(vp, archbits, (vm_offset_t)(&header.fat_header), &fat_arch); + error = fatfile_getarch_with_bits(archbits, + (vm_offset_t)(&header->fat_header), sizeof(*header), &fat_arch); if (error != LOAD_SUCCESS) goto bad2; /* Read the Mach-O header out of it */ - error = vn_rdwr(UIO_READ, vp, (caddr_t)&header.mach_header, - sizeof(header.mach_header), fat_arch.offset, - UIO_SYSSPACE32, IO_NODELOCKED, cred, &resid, p); + error = vn_rdwr(UIO_READ, vp, (caddr_t)&header->mach_header, + sizeof (header->mach_header), fat_arch.offset, + UIO_SYSSPACE, IO_NODELOCKED, kerncred, &resid, p); if (error) { error = LOAD_IOERROR; goto bad2; } + if (resid) { + error = LOAD_BADMACHO; + goto bad2; + } + /* Is this really a Mach-O? */ - if (header.mach_header.magic != MH_MAGIC && - header.mach_header.magic != MH_MAGIC_64) { + if (header->mach_header.magic != MH_MAGIC && + header->mach_header.magic != MH_MAGIC_64) { error = LOAD_BADMACHO; goto bad2; } *file_offset = fat_arch.offset; - *macho_size = fsize = fat_arch.size; + *macho_size = fat_arch.size; } else { /* * Force get_macho_vnode() to fail if the architecture bits @@ -1474,25 +2319,23 @@ get_macho_vnode( * required, since the dynamic linker might work, but we will * refuse to load it because of this check. */ - if ((cpu_type_t)(header.mach_header.cputype & CPU_ARCH_MASK) != archbits) - return(LOAD_BADARCH); + if ((cpu_type_t)(header->mach_header.cputype & CPU_ARCH_MASK) != archbits) { + error = LOAD_BADARCH; + goto bad2; + } *file_offset = 0; *macho_size = fsize; } - *mach_header = header.mach_header; + *mach_header = header->mach_header; *vpp = vp; ubc_setsize(vp, fsize); - return (error); bad2: - err2 = VNOP_CLOSE(vp, FREAD, &context); - vnode_put(vp); - return (error); - + (void) VNOP_CLOSE(vp, FREAD, ctx); bad1: vnode_put(vp); return(error);