/* * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This 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 OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_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 #include #include #include #include #include #include #include #include #include #include /* * Prototypes of static functions. */ static load_return_t parse_machfile( struct vnode *vp, vm_map_t map, thread_act_t thr_act, struct mach_header *header, unsigned long file_offset, unsigned long macho_size, int depth, load_result_t *result, boolean_t clean_regions ), load_segment( struct segment_command *scp, void * pager, unsigned long pager_offset, unsigned long macho_size, unsigned long end_of_file, vm_map_t map, load_result_t *result ), load_unixthread( struct thread_command *tcp, thread_act_t thr_act, load_result_t *result ), load_thread( struct thread_command *tcp, thread_act_t thr_act, load_result_t *result ), load_threadstate( thread_t thread, unsigned long *ts, unsigned long total_size ), load_threadstack( thread_t thread, unsigned long *ts, unsigned long total_size, vm_offset_t *user_stack, int *customstack ), load_threadentry( thread_t thread, unsigned long *ts, unsigned long total_size, vm_offset_t *entry_point ), load_dylinker( struct dylinker_command *lcp, vm_map_t map, thread_act_t thr_act, int depth, load_result_t *result, boolean_t clean_regions ), get_macho_vnode( char *path, struct mach_header *mach_header, unsigned long *file_offset, unsigned long *macho_size, struct vnode **vpp ); load_return_t load_machfile( struct vnode *vp, struct mach_header *header, unsigned long file_offset, unsigned long macho_size, load_result_t *result, thread_act_t thr_act, vm_map_t new_map, boolean_t clean_regions ) { pmap_t pmap; vm_map_t map; vm_map_t old_map; load_result_t myresult; kern_return_t kret; load_return_t lret; boolean_t create_map = TRUE; #ifndef i386 extern pmap_t pmap_create(vm_size_t size); /* XXX */ #endif 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_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_t) { 0 }; lret = parse_machfile(vp, map, thr_act, header, file_offset, macho_size, 0, result, clean_regions); 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; static load_return_t parse_machfile( struct vnode *vp, vm_map_t map, thread_act_t thr_act, struct mach_header *header, unsigned long file_offset, unsigned long macho_size, int depth, load_result_t *result, boolean_t clean_regions ) { struct machine_slot *ms; int ncmds; struct load_command *lcp, *next; struct dylinker_command *dlp = 0; void * pager; load_return_t ret = LOAD_SUCCESS; vm_offset_t addr, kl_addr; vm_size_t size,kl_size; int offset; int pass; struct proc *p = current_proc(); /* XXXX */ int error; int resid=0; task_t task; /* * Break infinite recursion */ if (depth > 6) return(LOAD_FAILURE); task = (task_t)get_threadtask(thr_act); depth++; /* * Check to see if right machine type. */ ms = &machine_slot[cpu_number()]; if ((header->cputype != ms->cpu_type) || !check_cpu_subtype(header->cpusubtype)) return(LOAD_BADARCH); 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 ((sizeof (struct mach_header) + header->sizeofcmds) > macho_size) return(LOAD_BADMACHO); /* * Round size of Mach-O commands up to page boundry. */ size = round_page_32(sizeof (struct mach_header) + 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 = kl_addr; if (addr == NULL) return(LOAD_NOSPACE); if(error = vn_rdwr(UIO_READ, vp, (caddr_t)addr, size, file_offset, UIO_SYSSPACE, 0, p->p_ucred, &resid, p)) { if (kl_addr ) kfree(kl_addr, kl_size); return(LOAD_IOERROR); } /* ubc_map(vp); */ /* NOT HERE */ /* * Scan through the commands, processing each one as necessary. */ for (pass = 1; pass <= 2; pass++) { offset = sizeof(struct mach_header); ncmds = header->ncmds; while (ncmds--) { /* * Get a pointer to the command. */ lcp = (struct load_command *)(addr + offset); offset += lcp->cmdsize; /* * Check for valid lcp pointer by checking * next offset. */ if (offset > header->sizeofcmds + sizeof(struct mach_header)) { if (kl_addr ) kfree(kl_addr, kl_size); return(LOAD_BADMACHO); } /* * Check for valid command. */ switch(lcp->cmd) { case LC_SEGMENT: if (pass != 1) break; ret = load_segment( (struct segment_command *) lcp, pager, file_offset, macho_size, (unsigned long)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; else ret = LOAD_FAILURE; break; default: ret = LOAD_SUCCESS;/* ignore other stuff */ } if (ret != LOAD_SUCCESS) break; } if (ret != LOAD_SUCCESS) break; } if ((ret == LOAD_SUCCESS) && (depth == 1)) { vm_offset_t addr; 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 */ addr = map_info.client_base; if(clean_regions) { vm_map(map, &addr, map_info.text_size, 0, SHARED_LIB_ALIAS, map_info.text_region, 0, FALSE, VM_PROT_READ, VM_PROT_READ, VM_INHERIT_SHARE); } else { vm_map(map, &addr, map_info.text_size, 0, (VM_MEMORY_SHARED_PMAP << 24) | SHARED_LIB_ALIAS, map_info.text_region, 0, FALSE, VM_PROT_READ, VM_PROT_READ, VM_INHERIT_SHARE); } addr = map_info.client_base + map_info.text_size; vm_map(map, &addr, map_info.data_size, 0, SHARED_LIB_ALIAS, 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); addr = map_info.client_base; vm_map(map, &addr, map_info.text_size, 0, SHARED_LIB_ALIAS, map_info.text_region, 0, FALSE, VM_PROT_READ, VM_PROT_READ, VM_INHERIT_SHARE); } } if (dlp != 0) { ret = load_dylinker(dlp, map, thr_act, depth, result, clean_regions); } } if (kl_addr ) kfree(kl_addr, kl_size); if ((ret == LOAD_SUCCESS) && (depth == 1) && (result->thread_count == 0)) ret = LOAD_FAILURE; if (ret == LOAD_SUCCESS) ubc_map(vp); return(ret); } static load_return_t load_segment( struct segment_command *scp, void * pager, unsigned long pager_offset, unsigned long macho_size, unsigned long 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; caddr_t tmp; 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_32(scp->vmsize); if (seg_size == 0) return(KERN_SUCCESS); /* * Round sizes to page size. */ map_size = round_page_32(scp->filesize); map_addr = trunc_page_32(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, FALSE, 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, TRUE); 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, FALSE); 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_unixthread( struct thread_command *tcp, thread_act_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_thread( struct thread_command *tcp, thread_act_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); act_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_threadstate( thread_t thread, unsigned long *ts, unsigned long total_size ) { kern_return_t ret; unsigned long size; int flavor; /* * Set the thread state. */ while (total_size > 0) { flavor = *ts++; size = *ts++; total_size -= (size+2)*sizeof(unsigned long); if (total_size < 0) return(LOAD_BADMACHO); ret = thread_setstatus(thread, flavor, 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, vm_offset_t *user_stack, int *customstack ) { kern_return_t ret; unsigned long size; int flavor; while (total_size > 0) { flavor = *ts++; size = *ts++; total_size -= (size+2)*sizeof(unsigned long); if (total_size < 0) return(LOAD_BADMACHO); *user_stack = USRSTACK; ret = thread_userstack(thread, flavor, 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, vm_offset_t *entry_point ) { kern_return_t ret; unsigned long size; int flavor; /* * Set the thread state. */ *entry_point = 0; while (total_size > 0) { flavor = *ts++; size = *ts++; total_size -= (size+2)*sizeof(unsigned long); if (total_size < 0) return(LOAD_BADMACHO); ret = thread_entrypoint(thread, flavor, 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, vm_map_t map, thread_act_t thr_act, int depth, load_result_t *result, boolean_t clean_regions ) { char *name; char *p; struct vnode *vp; struct mach_header header; unsigned long file_offset; unsigned long macho_size; vm_map_t copy_map; load_result_t myresult; kern_return_t ret; vm_map_copy_t tmp; vm_offset_t dyl_start, map_addr; vm_size_t dyl_length; extern pmap_t pmap_create(vm_size_t size); /* XXX */ 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, &header, &file_offset, &macho_size, &vp); if (ret) return (ret); myresult = (load_result_t) { 0 }; /* * Load the Mach-O. */ copy_map = vm_map_create(pmap_create(macho_size), get_map_min(map), get_map_max( map), TRUE); ret = parse_machfile(vp, copy_map, thr_act, &header, file_offset, macho_size, depth, &myresult, clean_regions); if (ret) goto out; if (get_map_nentries(copy_map) > 0) { dyl_start = get_map_start(copy_map); dyl_length = get_map_end(copy_map) - dyl_start; map_addr = dyl_start; ret = vm_allocate(map, &map_addr, dyl_length, FALSE); if (ret != KERN_SUCCESS) { ret = vm_allocate(map, &map_addr, dyl_length, TRUE); } if (ret != KERN_SUCCESS) { ret = LOAD_NOSPACE; goto out; } ret = vm_map_copyin(copy_map, dyl_start, dyl_length, TRUE, &tmp); if (ret != KERN_SUCCESS) { (void) vm_map_remove(map, map_addr, map_addr + dyl_length, VM_MAP_NO_FLAGS); goto out; } ret = vm_map_copy_overwrite(map, map_addr, tmp, FALSE); if (ret != KERN_SUCCESS) { vm_map_copy_discard(tmp); (void) vm_map_remove(map, map_addr, 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; ubc_map(vp); } out: vm_map_deallocate(copy_map); vrele(vp); return (ret); } static load_return_t get_macho_vnode( char *path, struct mach_header *mach_header, unsigned long *file_offset, unsigned long *macho_size, struct vnode **vpp ) { struct vnode *vp; struct vattr attr, *atp; 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 = p->p_ucred; int err2; ndp = &nid; atp = &attr; /* init the namei data to point the file user's program name */ NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, path, p); if (error = namei(ndp)) { if (error == ENOENT) error = LOAD_ENOENT; else error = LOAD_FAILURE; return(error); } vp = ndp->ni_vp; /* check for regular file */ if (vp->v_type != VREG) { error = LOAD_PROTECT; goto bad1; } /* get attributes */ if (error = VOP_GETATTR(vp, &attr, cred, p)) { error = LOAD_FAILURE; goto bad1; } /* Check mount point */ if (vp->v_mount->mnt_flag & MNT_NOEXEC) { error = LOAD_PROTECT; goto bad1; } if ((vp->v_mount->mnt_flag & MNT_NOSUID) || (p->p_flag & P_TRACED)) atp->va_mode &= ~(VSUID | VSGID); /* check access. for root we have to see if any exec bit on */ if (error = VOP_ACCESS(vp, VEXEC, cred, p)) { error = LOAD_PROTECT; goto bad1; } if ((atp->va_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) == 0) { error = LOAD_PROTECT; goto bad1; } /* hold the vnode for the IO */ if (UBCINFOEXISTS(vp) && !ubc_hold(vp)) { error = LOAD_ENOENT; goto bad1; } /* try to open it */ if (error = VOP_OPEN(vp, FREAD, cred, p)) { error = LOAD_PROTECT; ubc_rele(vp); goto bad1; } if(error = vn_rdwr(UIO_READ, vp, (caddr_t)&header, sizeof(header), 0, UIO_SYSSPACE, IO_NODELOCKED, cred, &resid, p)) { error = LOAD_IOERROR; goto bad2; } if (header.mach_header.magic == MH_MAGIC) 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(vp, (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_SYSSPACE, 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) { error = LOAD_BADMACHO; goto bad2; } *file_offset = fat_arch.offset; *macho_size = fsize = fat_arch.size; } else { *file_offset = 0; *macho_size = fsize = attr.va_size; } *mach_header = header.mach_header; *vpp = vp; if (UBCISVALID(vp)) ubc_setsize(vp, fsize); /* XXX why? */ VOP_UNLOCK(vp, 0, p); ubc_rele(vp); return (error); bad2: VOP_UNLOCK(vp, 0, p); err2 = VOP_CLOSE(vp, FREAD, cred, p); ubc_rele(vp); vrele(vp); return (error); bad1: vput(vp); return(error); }