/* * Copyright (c) 2006 Apple Computer, Inc. All Rights Reserved. * * @APPLE_LICENSE_OSREFERENCE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the * License may not be used to create, or enable the creation or * redistribution of, unlawful or unlicensed copies of an Apple operating * system, or to circumvent, violate, or enable the circumvention or * violation of, any terms of an Apple operating system software license * agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_OSREFERENCE_HEADER_END@ */ /* * Copyright (C) 1988, 1989, NeXT, Inc. * * File: kern/mach_loader.c * Author: Avadis Tevanian, Jr. * * Mach object file loader (kernel version, for now). * * 21-Jul-88 Avadis Tevanian, Jr. (avie) at NeXT * Started. */ #include #include #include #include #include #include #include #include #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 #include #include #include /* * 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); extern void pmap_switch(pmap_t); extern void pmap_map_sharedpage(task_t task, pmap_t pmap); /* * XXX kern/thread.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); /* XXX should have prototypes in a shared header file */ extern int grade_binary(cpu_type_t exectype, cpu_subtype_t execsubtype); 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 *); /* 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 }; /* * Prototypes of static functions. */ static load_return_t parse_machfile( struct vnode *vp, vm_map_t map, thread_t thr_act, struct mach_header *header, off_t file_offset, off_t macho_size, boolean_t shared_regions, boolean_t clean_regions, int depth, load_result_t *result ); static load_return_t load_segment( struct segment_command *scp, void * pager, off_t pager_offset, off_t macho_size, off_t end_of_file, vm_map_t map, 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_result_t *result ); static load_return_t load_unixthread( struct thread_command *tcp, thread_t thr_act, load_result_t *result ); static load_return_t load_thread( struct thread_command *tcp, thread_t thr_act, load_result_t *result ); static load_return_t load_threadstate( thread_t thread, unsigned long *ts, unsigned long total_size ); static load_return_t load_threadstack( thread_t thread, unsigned long *ts, unsigned long total_size, mach_vm_offset_t *user_stack, int *customstack ); static load_return_t load_threadentry( thread_t thread, unsigned long *ts, unsigned long total_size, mach_vm_offset_t *entry_point ); static load_return_t load_dylinker( struct dylinker_command *lcp, integer_t archbits, vm_map_t map, thread_t thr_act, int depth, load_result_t *result, boolean_t clean_regions ); static load_return_t get_macho_vnode( char *path, integer_t archbits, struct mach_header *mach_header, off_t *file_offset, off_t *macho_size, struct vnode **vpp ); 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, 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; 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; if (new_map != VM_MAP_NULL) { create_map = FALSE; } if (create_map) { old_map = current_map(); #ifdef i386 pmap = get_task_pmap(current_task()); pmap_reference(pmap); #else pmap = pmap_create((vm_map_size_t) 0); #endif map = vm_map_create(pmap, get_map_min(old_map), get_map_max(old_map), TRUE); /**** FIXME ****/ } else map = new_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); if (lret != LOAD_SUCCESS) { if (create_map) { vm_map_deallocate(map); /* will lose pmap reference too */ } return(lret); } /* * 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. */ if (create_map) { task_halt(current_task()); old_map = swap_task_map(current_task(), map); #ifndef i386 pmap_switch(pmap); /* Make sure we are using the new pmap */ #endif vm_map_deallocate(old_map); } return(LOAD_SUCCESS); } int dylink_test = 1; /* * The file size of a mach-o file is limited to 32 bits; this is because * this is the limit on the kalloc() of enough bytes for a mach_header and * the contents of its sizeofcmds, which is currently constrained to 32 * 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. */ static load_return_t parse_machfile( struct vnode *vp, vm_map_t map, thread_t thr_act, struct mach_header *header, off_t file_offset, off_t macho_size, boolean_t shared_regions, boolean_t clean_regions, int depth, load_result_t *result ) { uint32_t ncmds; struct load_command *lcp; struct dylinker_command *dlp = 0; integer_t dlarchbits = 0; void * pager; load_return_t ret = LOAD_SUCCESS; caddr_t addr; void * kl_addr; vm_size_t size,kl_size; size_t offset; size_t oldoffset; /* for overflow check */ int pass; struct proc *p = current_proc(); /* XXXX */ int error; int resid=0; task_t task; size_t mach_header_sz = sizeof(struct mach_header); boolean_t abi64; if (header->magic == MH_MAGIC_64 || header->magic == MH_CIGAM_64) { mach_header_sz = sizeof(struct mach_header_64); } /* * Break infinite recursion */ if (depth > 6) 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)) 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) return (LOAD_FAILURE); break; case MH_DYLINKER: if (depth != 2) return (LOAD_FAILURE); break; default: return (LOAD_FAILURE); } /* * Get the pager for the file. */ UBCINFOCHECK("parse_machfile", vp); pager = (void *) ubc_getpager(vp); /* * Map portion that must be accessible directly into * kernel's map. */ if ((mach_header_sz + header->sizeofcmds) > macho_size) return(LOAD_BADMACHO); /* * Round size of Mach-O commands up to page boundry. */ size = round_page(mach_header_sz + header->sizeofcmds); if (size <= 0) return(LOAD_BADMACHO); /* * Map the load commands into kernel memory. */ addr = 0; kl_size = size; kl_addr = kalloc(size); addr = (caddr_t)kl_addr; if (addr == NULL) return(LOAD_NOSPACE); error = vn_rdwr(UIO_READ, vp, addr, size, file_offset, UIO_SYSSPACE32, 0, kauth_cred_get(), &resid, p); if (error) { if (kl_addr ) kfree(kl_addr, kl_size); return(LOAD_IOERROR); } /* (void)ubc_map(vp, PROT_EXEC); */ /* NOT HERE */ /* * Scan through the commands, processing each one as necessary. */ for (pass = 1; pass <= 2; pass++) { /* * Loop through each of the load_commands indicated by the * Mach-O header; if an absurd value is provided, we just * run off the end of the reserved section by incrementing * the offset too far, so we are implicitly fail-safe. */ offset = mach_header_sz; ncmds = header->ncmds; while (ncmds--) { /* * Get a pointer to the command. */ lcp = (struct load_command *)(addr + offset); oldoffset = offset; offset += lcp->cmdsize; /* * Perform prevalidation of the struct load_command * before we attempt to use its contents. Invalid * values are ones which result in an overflow, or * which can not possibly be valid commands, or which * straddle or exist past the reserved section at the * start of the image. */ if (oldoffset > offset || lcp->cmdsize < sizeof(struct load_command) || offset > header->sizeofcmds + mach_header_sz) { ret = LOAD_BADMACHO; break; } /* * Act on struct load_command's for which kernel * 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) break; ret = load_segment( (struct segment_command *) lcp, pager, file_offset, macho_size, ubc_getsize(vp), map, result); break; case LC_THREAD: if (pass != 2) break; ret = load_thread((struct thread_command *)lcp, thr_act, result); break; case LC_UNIXTHREAD: if (pass != 2) break; ret = load_unixthread( (struct thread_command *) lcp, thr_act, result); break; case LC_LOAD_DYLINKER: if (pass != 2) break; if ((depth == 1) && (dlp == 0)) { dlp = (struct dylinker_command *)lcp; dlarchbits = (header->cputype & CPU_ARCH_MASK); } else { ret = LOAD_FAILURE; } break; default: /* Other commands are ignored by the kernel */ ret = LOAD_SUCCESS; break; } if (ret != LOAD_SUCCESS) break; } 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); } else { shared_region_mapping_dealloc(system_region); } } 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); } } } if (dlp != 0) ret = load_dylinker(dlp, dlarchbits, map, thr_act, depth, result, clean_regions); if(depth == 1) { if (result->thread_count == 0) ret = LOAD_FAILURE; #ifdef __ppc__ 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); } #endif } } if (kl_addr ) kfree(kl_addr, kl_size); if (ret == LOAD_SUCCESS) (void)ubc_map(vp, PROT_EXEC); return(ret); } static load_return_t load_segment( struct segment_command *scp, void * pager, off_t pager_offset, off_t macho_size, __unused off_t end_of_file, vm_map_t map, load_result_t *result ) { kern_return_t ret; vm_offset_t map_addr, map_offset; 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 (scp->fileoff + scp->filesize > macho_size) return (LOAD_BADMACHO); seg_size = round_page(scp->vmsize); if (seg_size == 0) return(KERN_SUCCESS); /* * Round sizes to page size. */ map_size = round_page(scp->filesize); map_addr = trunc_page(scp->vmaddr); map_offset = pager_offset + scp->fileoff; if (map_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 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; ret = vm_allocate(kernel_map, &tmp, delta_size, VM_FLAGS_ANYWHERE); if (ret != KERN_SUCCESS) return(LOAD_RESOURCE); if (copyout(tmp, map_addr + scp->filesize, delta_size)) { (void) vm_deallocate( kernel_map, tmp, delta_size); return(LOAD_FAILURE); } (void) vm_deallocate(kernel_map, tmp, delta_size); } #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) { vm_offset_t tmp = map_addr + map_size; ret = vm_allocate(map, &tmp, delta_size, VM_FLAGS_FIXED); if (ret != KERN_SUCCESS) return(LOAD_NOSPACE); } /* * Set protection values. (Note: ignore errors!) */ if (scp->maxprot != VM_PROT_DEFAULT) { (void) vm_protect(map, map_addr, seg_size, TRUE, scp->maxprot); } if (scp->initprot != VM_PROT_DEFAULT) { (void) vm_protect(map, map_addr, seg_size, FALSE, scp->initprot); } if ( (scp->fileoff == 0) && (scp->filesize != 0) ) result->mach_header = map_addr; return(LOAD_SUCCESS); } 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_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); 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); } #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_allocate(map, &tmp, delta_size, VM_FLAGS_FIXED); if (ret != KERN_SUCCESS) return(LOAD_NOSPACE); } /* * Set protection values. (Note: ignore errors!) */ if (scp64->maxprot != VM_PROT_DEFAULT) { (void) mach_vm_protect(map, map_addr, seg_size, TRUE, scp64->maxprot); } if (scp64->initprot != VM_PROT_DEFAULT) { (void) mach_vm_protect(map, map_addr, seg_size, FALSE, scp64->initprot); } if ( (scp64->fileoff == 0) && (scp64->filesize != 0) ) result->mach_header = map_addr; return(LOAD_SUCCESS); } static load_return_t load_thread( struct thread_command *tcp, thread_t thread, 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 */ if (result->thread_count != 0) { kret = thread_create(task, &thread); if (kret != KERN_SUCCESS) return(LOAD_RESOURCE); thread_deallocate(thread); } 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); 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); } /* * 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); result->thread_count++; return(LOAD_SUCCESS); } static load_return_t load_unixthread( struct thread_command *tcp, thread_t thread, load_result_t *result ) { load_return_t ret; int customstack =0; if (result->thread_count != 0) return (LOAD_FAILURE); ret = load_threadstack(thread, (unsigned long *)(((vm_offset_t)tcp) + sizeof(struct thread_command)), tcp->cmdsize - sizeof(struct thread_command), &result->user_stack, &customstack); if (ret != LOAD_SUCCESS) return(ret); if (customstack) result->customstack = 1; else result->customstack = 0; ret = load_threadentry(thread, (unsigned long *)(((vm_offset_t)tcp) + sizeof(struct thread_command)), tcp->cmdsize - sizeof(struct thread_command), &result->entry_point); if (ret != LOAD_SUCCESS) return(ret); ret = load_threadstate(thread, (unsigned long *)(((vm_offset_t)tcp) + sizeof(struct thread_command)), tcp->cmdsize - sizeof(struct thread_command)); if (ret != LOAD_SUCCESS) return (ret); result->unixproc = TRUE; result->thread_count++; return(LOAD_SUCCESS); } static load_return_t load_threadstate( thread_t thread, unsigned long *ts, unsigned long total_size ) { kern_return_t ret; unsigned long size; int flavor; unsigned long thread_size; 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. */ 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 *) */ } return(LOAD_SUCCESS); } static load_return_t load_threadstack( thread_t thread, unsigned long *ts, unsigned long total_size, user_addr_t *user_stack, int *customstack ) { kern_return_t ret; unsigned long size; int flavor; unsigned long stack_size; while (total_size > 0) { flavor = *ts++; size = *ts++; stack_size = (size+2)*sizeof(unsigned long); if (stack_size > total_size) return(LOAD_BADMACHO); total_size -= stack_size; /* * Third argument is a kernel space pointer; it gets cast * to the appropriate type in thread_userstack() based on * the value of flavor. */ ret = thread_userstack(thread, flavor, (thread_state_t)ts, size, user_stack, customstack); if (ret != KERN_SUCCESS) return(LOAD_FAILURE); ts += size; /* ts is a (unsigned long *) */ } return(LOAD_SUCCESS); } static load_return_t load_threadentry( thread_t thread, unsigned long *ts, unsigned long total_size, mach_vm_offset_t *entry_point ) { kern_return_t ret; unsigned long size; int flavor; unsigned long entry_size; /* * Set the thread state. */ *entry_point = MACH_VM_MIN_ADDRESS; while (total_size > 0) { flavor = *ts++; size = *ts++; entry_size = (size+2)*sizeof(unsigned long); if (entry_size > total_size) return(LOAD_BADMACHO); total_size -= entry_size; /* * Third argument is a kernel space pointer; it gets cast * to the appropriate type in thread_entrypoint() based on * the value of flavor. */ ret = thread_entrypoint(thread, flavor, (thread_state_t)ts, size, entry_point); if (ret != KERN_SUCCESS) return(LOAD_FAILURE); ts += size; /* ts is a (unsigned long *) */ } return(LOAD_SUCCESS); } static load_return_t load_dylinker( struct dylinker_command *lcp, integer_t archbits, vm_map_t map, thread_t thr_act, int depth, load_result_t *result, boolean_t clean_regions ) { 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; kern_return_t ret; vm_map_copy_t tmp; mach_vm_offset_t dyl_start, map_addr; mach_vm_size_t dyl_length; name = (char *)lcp + lcp->name.offset; /* * Check for a proper null terminated string. */ p = name; do { if (p >= (char *)lcp + lcp->cmdsize) return(LOAD_BADMACHO); } while (*p++); ret = get_macho_vnode(name, archbits, &header, &file_offset, &macho_size, &vp); if (ret) return (ret); /* * Load the Mach-O. * Use a temporary map to do the work. */ copy_map = vm_map_create(pmap_create(vm_map_round_page(macho_size)), 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, copy_map, thr_act, &header, file_offset, macho_size, FALSE, clean_regions, depth, &myresult); if (ret) goto out; if (get_map_nentries(copy_map) > 0) { dyl_start = mach_get_vm_start(copy_map); dyl_length = mach_get_vm_end(copy_map) - dyl_start; 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 != 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); 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); goto out; } 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); goto out; } 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); } out: vm_map_deallocate(copy_map); vnode_put(vp); return (ret); } /* * This routine exists to support the load_dylinker(). * * This routine has its own, separate, understanding of the FAT file format, * which is terrifically unfortunate. */ static load_return_t get_macho_vnode( char *path, integer_t archbits, struct mach_header *mach_header, off_t *file_offset, off_t *macho_size, struct vnode **vpp ) { struct vnode *vp; struct vfs_context context; struct nameidata nid, *ndp; struct proc *p = current_proc(); /* XXXX */ boolean_t is_fat; struct fat_arch fat_arch; int error = LOAD_SUCCESS; int resid; union { struct mach_header mach_header; struct fat_header fat_header; char pad[512]; } 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; /* 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); if ((error = namei(ndp)) != 0) { if (error == ENOENT) error = LOAD_ENOENT; else error = LOAD_FAILURE; return(error); } nameidone(ndp); vp = ndp->ni_vp; /* check for regular file */ if (vp->v_type != VREG) { error = LOAD_PROTECT; goto bad1; } /* get size */ if ((error = vnode_size(vp, &fsize, &context)) != 0) { error = LOAD_FAILURE; goto bad1; } /* Check mount point */ if (vp->v_mount->mnt_flag & MNT_NOEXEC) { error = LOAD_PROTECT; goto bad1; } /* check access */ if ((error = vnode_authorize(vp, NULL, KAUTH_VNODE_EXECUTE, &context)) != 0) { error = LOAD_PROTECT; goto bad1; } /* try to open it */ if ((error = VNOP_OPEN(vp, FREAD, &context)) != 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) { 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) is_fat = TRUE; else { error = LOAD_BADMACHO; goto bad2; } if (is_fat) { /* Look up our architecture in the fat file. */ error = fatfile_getarch_with_bits(vp, archbits, (vm_offset_t)(&header.fat_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); if (error) { error = LOAD_IOERROR; goto bad2; } /* Is this really a Mach-O? */ 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; } else { /* * Force get_macho_vnode() to fail if the architecture bits * do not match the expected architecture bits. This in * turn causes load_dylinker() to fail for the same reason, * so it ensures the dynamic linker and the binary are in * lock-step. This is potentially bad, if we ever add to * the CPU_ARCH_* bits any bits that are desirable but not * 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); *file_offset = 0; *macho_size = fsize; } *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); bad1: vnode_put(vp); return(error); }