Sneed-Group/gems-kernel
2
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions
gems-kernel/source/THIRDPARTY/xnu/libkern/kxld/kxld_object.c
Sam Sneed f5727805f2 add darwin/xnu functionality
2024-06-03 11:29:39 -05:00

2732 lines
77 KiB
C
Raw Blame History

/*
* Copyright (c) 2009-2014 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_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_OSREFERENCE_LICENSE_HEADER_END@
*/
#include <string.h>
#include <sys/types.h>
#if KERNEL
#include <libkern/kernel_mach_header.h>
#include <mach/machine.h>
#include <mach/vm_param.h>
#include <mach-o/fat.h>
#else /* !KERNEL */
/* Get machine.h from the kernel source so we can support all platforms
* that the kernel supports. Otherwise we're at the mercy of the host.
*/
#include "../../osfmk/mach/machine.h"
#include <architecture/byte_order.h>
#include <mach/mach_init.h>
#include <mach-o/arch.h>
#include <mach-o/swap.h>
#endif /* KERNEL */
#include <mach-o/loader.h>
#include <mach-o/nlist.h>
#include <mach-o/reloc.h>
#include <os/overflow.h>
#define DEBUG_ASSERT_COMPONENT_NAME_STRING "kxld"
#include <AssertMacros.h>
#include "kxld_demangle.h"
#include "kxld_dict.h"
#include "kxld_reloc.h"
#include "kxld_sect.h"
#include "kxld_seg.h"
#include "kxld_srcversion.h"
#include "kxld_symtab.h"
#include "kxld_util.h"
#include "kxld_uuid.h"
#include "kxld_versionmin.h"
#include "kxld_vtable.h"
#include "kxld_splitinfolc.h"
#include "kxld_object.h"
/* NXArchInfo and friends are deprecated */
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
extern boolean_t isSplitKext;
extern boolean_t isOldInterface;
/*******************************************************************************
* Data structures
*******************************************************************************/
struct kxld_object {
u_char *file; // used by old interface
u_long size; // used by old interface
const char *name;
uint32_t filetype;
cpu_type_t cputype;
cpu_subtype_t cpusubtype;
KXLDArray segs;
KXLDArray sects;
KXLDArray extrelocs;
KXLDArray locrelocs;
KXLDRelocator relocator;
KXLDuuid uuid;
KXLDversionmin versionmin;
KXLDsrcversion srcversion;
KXLDSymtab *symtab;
struct dysymtab_command *dysymtab_hdr;
KXLDsplitinfolc splitinfolc;
splitKextLinkInfo split_info;
kxld_addr_t link_addr;
u_long output_buffer_size;
boolean_t is_kernel;
boolean_t is_final_image;
boolean_t is_linked;
boolean_t got_is_created;
#if KXLD_USER_OR_OBJECT
KXLDArray *section_order;
#endif
#if KXLD_PIC_KEXTS
boolean_t include_kaslr_relocs;
#endif
#if !KERNEL
enum NXByteOrder host_order;
enum NXByteOrder target_order;
#endif
};
/*******************************************************************************
* Prototypes
*******************************************************************************/
static kern_return_t get_target_machine_info(KXLDObject *object,
cpu_type_t cputype, cpu_subtype_t cpusubtype);
static kern_return_t get_macho_slice_for_arch(KXLDObject *object,
u_char *file, u_long size);
static u_long get_macho_header_size(const KXLDObject *object);
static u_long get_macho_data_size(const KXLDObject *object) __unused;
static kern_return_t init_from_execute(KXLDObject *object);
static kern_return_t init_from_final_linked_image(KXLDObject *object,
u_int *filetype_out, struct symtab_command **symtab_hdr_out);
static boolean_t target_supports_protected_segments(const KXLDObject *object)
__attribute__((pure));
static void set_is_object_linked(KXLDObject *object);
#if KXLD_USER_OR_BUNDLE
static boolean_t target_supports_bundle(const KXLDObject *object)
__attribute((pure));
static kern_return_t init_from_bundle(KXLDObject *object);
static kern_return_t process_relocs_from_tables(KXLDObject *object);
static KXLDSeg *get_seg_by_base_addr(KXLDObject *object,
kxld_addr_t base_addr);
static kern_return_t process_symbol_pointers(KXLDObject *object);
static void add_to_ptr(u_char *symptr, kxld_addr_t val, boolean_t is_32_bit);
#endif /* KXLD_USER_OR_BUNDLE */
#if KXLD_USER_OR_OBJECT
static boolean_t target_supports_object(const KXLDObject *object)
__attribute((pure));
static kern_return_t init_from_object(KXLDObject *object);
static kern_return_t process_relocs_from_sections(KXLDObject *object);
#endif /* KXLD_USER_OR_OBJECT */
#if KXLD_PIC_KEXTS
static boolean_t target_supports_slideable_kexts(const KXLDObject *object);
#endif /* KXLD_PIC_KEXTS */
static kern_return_t export_macho_header(const KXLDObject *object, u_char *buf,
u_int ncmds, u_long *header_offset, u_long header_size);
#if KXLD_USER_OR_ILP32
static u_long get_macho_cmd_data_32(u_char *file, u_long offset,
u_int *filetype, u_int *ncmds);
static kern_return_t export_macho_header_32(const KXLDObject *object,
u_char *buf, u_int ncmds, u_long *header_offset, u_long header_size);
#endif /* KXLD_USER_OR_ILP32 */
#if KXLD_USER_OR_LP64
static u_long get_macho_cmd_data_64(u_char *file, u_long offset,
u_int *filetype, u_int *ncmds);
static kern_return_t export_macho_header_64(const KXLDObject *object,
u_char *buf, u_int ncmds, u_long *header_offset, u_long header_size);
#endif /* KXLD_USER_OR_LP64 */
#if KXLD_USER_OR_GOT || KXLD_USER_OR_COMMON
static kern_return_t add_section(KXLDObject *object, KXLDSect **sect);
#endif /* KXLD_USER_OR_GOT || KXLD_USER_OR_COMMON */
#if KXLD_USER_OR_COMMON
static kern_return_t resolve_common_symbols(KXLDObject *object);
#endif /* KXLD_USER_OR_COMMON */
#if KXLD_USER_OR_GOT
static boolean_t target_has_got(const KXLDObject *object) __attribute__((pure));
static kern_return_t create_got(KXLDObject *object);
static kern_return_t populate_got(KXLDObject *object);
#endif /* KXLD_USER_OR_GOT */
static KXLDSym *get_mutable_sym(const KXLDObject *object, const KXLDSym *sym);
static kern_return_t populate_kmod_info(KXLDObject *object);
/*******************************************************************************
* Prototypes that may need to be exported
*******************************************************************************/
static boolean_t kxld_object_target_needs_swap(const KXLDObject *object __unused);
static KXLDSeg * kxld_object_get_seg_by_name(const KXLDObject *object, const char *segname);
static KXLDSect * kxld_object_get_sect_by_name(const KXLDObject *object, const char *segname,
const char *sectname);
/*******************************************************************************
*******************************************************************************/
size_t
kxld_object_sizeof(void)
{
return sizeof(KXLDObject);
}
/*******************************************************************************
*******************************************************************************/
kern_return_t
kxld_object_init_from_macho(KXLDObject *object, u_char *file, u_long size,
const char *name, KXLDArray *section_order __unused,
cpu_type_t cputype, cpu_subtype_t cpusubtype, KXLDFlags flags __unused)
{
kern_return_t rval = KERN_FAILURE;
KXLDSeg * seg = NULL;
u_int i = 0;
u_char * my_file;
check(object);
check(file);
check(name);
object->name = name;
#if KXLD_USER_OR_OBJECT
object->section_order = section_order;
#endif
#if KXLD_PIC_KEXTS
object->include_kaslr_relocs = ((flags & kKXLDFlagIncludeRelocs) == kKXLDFlagIncludeRelocs);
#endif
/* Find the local architecture */
rval = get_target_machine_info(object, cputype, cpusubtype);
require_noerr(rval, finish);
/* Find the Mach-O slice for the target architecture */
rval = get_macho_slice_for_arch(object, file, size);
require_noerr(rval, finish);
if (isOldInterface) {
my_file = object->file;
} else {
my_file = object->split_info.kextExecutable;
}
/* Allocate the symbol table */
if (!object->symtab) {
object->symtab = kxld_calloc(kxld_symtab_sizeof());
require_action(object->symtab, finish, rval = KERN_RESOURCE_SHORTAGE);
}
/* Build the relocator */
rval = kxld_relocator_init(&object->relocator,
my_file,
object->symtab, &object->sects,
object->cputype,
object->cpusubtype,
kxld_object_target_needs_swap(object));
require_noerr(rval, finish);
/* There are four types of Mach-O files that we can support:
* 1) 32-bit MH_OBJECT - Snow Leopard and earlier
* 2) 32-bit MH_KEXT_BUNDLE - Lion and Later
* 3) 64-bit MH_OBJECT - Unsupported
* 4) 64-bit MH_KEXT_BUNDLE - Snow Leopard and Later
*/
if (kxld_object_is_32_bit(object)) {
struct mach_header *mach_hdr = (struct mach_header *) ((void *) my_file);
object->filetype = mach_hdr->filetype;
} else {
struct mach_header_64 *mach_hdr = (struct mach_header_64 *) ((void *) my_file);
object->filetype = mach_hdr->filetype;
}
switch (object->filetype) {
#if KXLD_USER_OR_BUNDLE
case MH_KEXT_BUNDLE:
rval = init_from_bundle(object);
require_noerr(rval, finish);
break;
#endif /* KXLD_USER_OR_BUNDLE */
#if KXLD_USER_OR_OBJECT
case MH_OBJECT:
rval = init_from_object(object);
require_noerr(rval, finish);
break;
#endif /* KXLD_USER_OR_OBJECT */
case MH_EXECUTE:
object->is_kernel = TRUE;
rval = init_from_execute(object);
require_noerr(rval, finish);
break;
default:
rval = KERN_FAILURE;
kxld_log(kKxldLogLinking, kKxldLogErr,
kKxldLogFiletypeNotSupported, object->filetype);
goto finish;
}
if (!kxld_object_is_kernel(object)) {
for (i = 0; i < object->segs.nitems; ++i) {
seg = kxld_array_get_item(&object->segs, i);
kxld_seg_set_vm_protections(seg,
target_supports_protected_segments(object));
}
seg = kxld_object_get_seg_by_name(object, SEG_LINKEDIT);
if (seg) {
(void) kxld_seg_populate_linkedit(seg, object->symtab,
kxld_object_is_32_bit(object)
#if KXLD_PIC_KEXTS
, &object->locrelocs, &object->extrelocs,
target_supports_slideable_kexts(object)
#endif
, isOldInterface ? 0 : object->splitinfolc.datasize
);
}
}
(void) set_is_object_linked(object);
rval = KERN_SUCCESS;
finish:
return rval;
}
/*******************************************************************************
*******************************************************************************/
splitKextLinkInfo *
kxld_object_get_link_info(KXLDObject *object)
{
check(object);
return &object->split_info;
}
/*******************************************************************************
*******************************************************************************/
void
kxld_object_set_link_info(KXLDObject *object, splitKextLinkInfo *link_info)
{
check(object);
check(link_info);
object->split_info.vmaddr_TEXT = link_info->vmaddr_TEXT;
object->split_info.vmaddr_TEXT_EXEC = link_info->vmaddr_TEXT_EXEC;
object->split_info.vmaddr_DATA = link_info->vmaddr_DATA;
object->split_info.vmaddr_DATA_CONST = link_info->vmaddr_DATA_CONST;
object->split_info.vmaddr_LLVM_COV = link_info->vmaddr_LLVM_COV;
object->split_info.vmaddr_LINKEDIT = link_info->vmaddr_LINKEDIT;
return;
}
/*******************************************************************************
*******************************************************************************/
kern_return_t
get_target_machine_info(KXLDObject *object, cpu_type_t cputype __unused,
cpu_subtype_t cpusubtype __unused)
{
#if KERNEL
/* Because the kernel can only link for its own architecture, we know what
* the host and target architectures are at compile time, so we can use
* a vastly simplified version of this function.
*/
check(object);
#if defined(__x86_64__)
object->cputype = CPU_TYPE_X86_64;
/* FIXME: we need clang to provide a __x86_64h__ macro for the sub-type. Using
* __AVX2__ is a temporary solution until this is available. */
#if defined(__AVX2__)
object->cpusubtype = CPU_SUBTYPE_X86_64_H;
#else
object->cpusubtype = CPU_SUBTYPE_X86_64_ALL;
#endif
return KERN_SUCCESS;
#elif defined(__arm__)
object->cputype = CPU_TYPE_ARM;
object->cpusubtype = CPU_SUBTYPE_ARM_ALL;
return KERN_SUCCESS;
#elif defined(__arm64__)
object->cputype = CPU_TYPE_ARM64;
object->cpusubtype = CPU_SUBTYPE_ARM64_ALL;
return KERN_SUCCESS;
#else
kxld_log(kKxldLogLinking, kKxldLogErr,
kKxldLogArchNotSupported, _mh_execute_header->cputype);
return KERN_NOT_SUPPORTED;
#endif /* Supported architecture defines */
#else /* !KERNEL */
/* User-space must look up the architecture it's running on and the target
* architecture at run-time.
*/
kern_return_t rval = KERN_FAILURE;
const NXArchInfo *host_arch = NULL;
check(object);
host_arch = NXGetLocalArchInfo();
require_action(host_arch, finish, rval = KERN_FAILURE);
object->host_order = host_arch->byteorder;
/* If the user did not specify a cputype, use the local architecture.
*/
if (cputype) {
object->cputype = cputype;
object->cpusubtype = cpusubtype;
} else {
object->cputype = host_arch->cputype;
object->target_order = object->host_order;
switch (object->cputype) {
case CPU_TYPE_I386:
object->cpusubtype = CPU_SUBTYPE_I386_ALL;
break;
case CPU_TYPE_X86_64:
object->cpusubtype = CPU_SUBTYPE_X86_64_ALL;
break;
case CPU_TYPE_ARM:
object->cpusubtype = CPU_SUBTYPE_ARM_ALL;
break;
case CPU_TYPE_ARM64:
object->cpusubtype = CPU_SUBTYPE_ARM64_ALL;
break;
default:
object->cpusubtype = 0;
break;
}
}
/* Validate that we support the target architecture and record its
* endianness.
*/
switch (object->cputype) {
case CPU_TYPE_ARM:
case CPU_TYPE_ARM64:
case CPU_TYPE_I386:
case CPU_TYPE_X86_64:
object->target_order = NX_LittleEndian;
break;
default:
rval = KERN_NOT_SUPPORTED;
kxld_log(kKxldLogLinking, kKxldLogErr,
kKxldLogArchNotSupported, object->cputype);
goto finish;
}
rval = KERN_SUCCESS;
finish:
return rval;
#endif /* KERNEL */
}
/*******************************************************************************
*******************************************************************************/
static kern_return_t
get_macho_slice_for_arch(KXLDObject *object, u_char *file, u_long size)
{
kern_return_t rval = KERN_FAILURE;
struct mach_header *mach_hdr = NULL;
#if !KERNEL
struct fat_header *fat = (struct fat_header *) ((void *) file);
struct fat_arch *archs = (struct fat_arch *) &fat[1];
boolean_t swap = FALSE;
#endif /* KERNEL */
u_char *my_file = file;
u_long my_file_size = size;
check(object);
check(file);
check(size);
/* We are assuming that we will never receive a fat file in the kernel */
#if !KERNEL
require_action(size >= sizeof(*fat), finish,
rval = KERN_FAILURE;
kxld_log(kKxldLogLinking, kKxldLogErr, kKxldLogTruncatedMachO));
/* The fat header is always big endian, so swap if necessary */
if (fat->magic == FAT_CIGAM) {
(void) swap_fat_header(fat, object->host_order);
swap = TRUE;
}
if (fat->magic == FAT_MAGIC) {
struct fat_arch *arch = NULL;
u_long arch_size;
boolean_t ovr = os_mul_and_add_overflow(fat->nfat_arch, sizeof(*archs), sizeof(*fat), &arch_size);
require_action(!ovr && size >= arch_size,
finish,
rval = KERN_FAILURE;
kxld_log(kKxldLogLinking, kKxldLogErr, kKxldLogTruncatedMachO));
/* Swap the fat_arch structures if necessary */
if (swap) {
(void) swap_fat_arch(archs, fat->nfat_arch, object->host_order);
}
/* Locate the Mach-O for the requested architecture */
arch = NXFindBestFatArch(object->cputype, object->cpusubtype, archs, fat->nfat_arch);
require_action(arch, finish, rval = KERN_FAILURE;
kxld_log(kKxldLogLinking, kKxldLogErr, kKxldLogArchNotFound));
require_action(size >= arch->offset + arch->size, finish,
rval = KERN_FAILURE;
kxld_log(kKxldLogLinking, kKxldLogErr, kKxldLogTruncatedMachO));
my_file = my_file + arch->offset;
my_file_size = arch->size;
}
#endif /* !KERNEL */
/* Swap the Mach-O's headers to this architecture if necessary */
if (kxld_object_is_32_bit(object)) {
rval = validate_and_swap_macho_32(my_file, my_file_size
#if !KERNEL
, object->host_order
#endif /* !KERNEL */
);
} else {
rval = validate_and_swap_macho_64(my_file, my_file_size
#if !KERNEL
, object->host_order
#endif /* !KERNEL */
);
}
require_noerr(rval, finish);
mach_hdr = (struct mach_header *) ((void *) my_file);
require_action(object->cputype == mach_hdr->cputype, finish,
rval = KERN_FAILURE;
kxld_log(kKxldLogLinking, kKxldLogErr, kKxldLogTruncatedMachO));
object->cpusubtype = mach_hdr->cpusubtype; /* <rdar://problem/16008438> */
if (isOldInterface) {
object->file = my_file;
object->size = my_file_size;
} else {
object->split_info.kextExecutable = my_file;
object->split_info.kextSize = my_file_size;
}
rval = KERN_SUCCESS;
finish:
return rval;
}
/*******************************************************************************
*******************************************************************************/
static kern_return_t
init_from_final_linked_image(KXLDObject *object, u_int *filetype_out,
struct symtab_command **symtab_hdr_out)
{
kern_return_t rval = KERN_FAILURE;
KXLDSeg *seg = NULL;
KXLDSect *sect = NULL;
struct load_command *cmd_hdr = NULL;
struct symtab_command *symtab_hdr = NULL;
struct uuid_command *uuid_hdr = NULL;
struct version_min_command *versionmin_hdr = NULL;
struct build_version_command *build_version_hdr = NULL;
struct source_version_command *source_version_hdr = NULL;
u_long base_offset = 0;
u_long offset = 0;
u_long sect_offset = 0;
u_int filetype = 0;
u_int i = 0;
u_int j = 0;
u_int segi = 0;
u_int secti = 0;
u_int nsegs = 0;
u_int nsects = 0;
u_int ncmds = 0;
u_char *my_file;
if (isOldInterface) {
my_file = object->file;
} else {
my_file = object->split_info.kextExecutable;
}
KXLD_3264_FUNC(kxld_object_is_32_bit(object), base_offset,
get_macho_cmd_data_32, get_macho_cmd_data_64,
my_file, offset, &filetype, &ncmds);
/* First pass to count segments and sections */
offset = base_offset;
for (i = 0; i < ncmds; ++i, offset += cmd_hdr->cmdsize) {
cmd_hdr = (struct load_command *) ((void *) (my_file + offset));
switch (cmd_hdr->cmd) {
#if KXLD_USER_OR_ILP32
case LC_SEGMENT:
{
struct segment_command *seg_hdr =
(struct segment_command *) cmd_hdr;
/* Ignore segments with no vm size */
if (!seg_hdr->vmsize) {
continue;
}
++nsegs;
nsects += seg_hdr->nsects;
}
break;
#endif /* KXLD_USER_OR_ILP32 */
#if KXLD_USER_OR_LP64
case LC_SEGMENT_64:
{
struct segment_command_64 *seg_hdr =
(struct segment_command_64 *) ((void *) cmd_hdr);
/* Ignore segments with no vm size */
if (!seg_hdr->vmsize) {
continue;
}
++nsegs;
nsects += seg_hdr->nsects;
}
break;
#endif /* KXLD_USER_OR_LP64 */
default:
continue;
}
}
/* Allocate the segments and sections */
if (nsegs) {
rval = kxld_array_init(&object->segs, sizeof(KXLDSeg), nsegs);
require_noerr(rval, finish);
rval = kxld_array_init(&object->sects, sizeof(KXLDSect), nsects);
require_noerr(rval, finish);
}
/* Initialize the segments and sections */
offset = base_offset;
for (i = 0; i < ncmds; ++i, offset += cmd_hdr->cmdsize) {
cmd_hdr = (struct load_command *) ((void *) (my_file + offset));
seg = NULL;
switch (cmd_hdr->cmd) {
#if KXLD_USER_OR_ILP32
case LC_SEGMENT:
{
struct segment_command *seg_hdr =
(struct segment_command *) cmd_hdr;
/* Ignore segments with no vm size */
if (!seg_hdr->vmsize) {
continue;
}
seg = kxld_array_get_item(&object->segs, segi++);
rval = kxld_seg_init_from_macho_32(seg, seg_hdr);
require_noerr(rval, finish);
sect_offset = offset + sizeof(*seg_hdr);
}
break;
#endif /* KXLD_USER_OR_ILP32 */
#if KXLD_USER_OR_LP64
case LC_SEGMENT_64:
{
struct segment_command_64 *seg_hdr =
(struct segment_command_64 *) ((void *) cmd_hdr);
/* Ignore segments with no vm size */
if (!seg_hdr->vmsize) {
continue;
}
seg = kxld_array_get_item(&object->segs, segi++);
rval = kxld_seg_init_from_macho_64(seg, seg_hdr);
require_noerr(rval, finish);
sect_offset = offset + sizeof(*seg_hdr);
}
break;
#endif /* KXLD_USER_OR_LP64 */
case LC_SYMTAB:
symtab_hdr = (struct symtab_command *) cmd_hdr;
break;
case LC_UUID:
uuid_hdr = (struct uuid_command *) cmd_hdr;
kxld_uuid_init_from_macho(&object->uuid, uuid_hdr);
break;
case LC_VERSION_MIN_MACOSX:
case LC_VERSION_MIN_IPHONEOS:
case LC_VERSION_MIN_TVOS:
case LC_VERSION_MIN_WATCHOS:
versionmin_hdr = (struct version_min_command *) cmd_hdr;
kxld_versionmin_init_from_macho(&object->versionmin, versionmin_hdr);
break;
case LC_BUILD_VERSION:
build_version_hdr = (struct build_version_command *)cmd_hdr;
kxld_versionmin_init_from_build_cmd(&object->versionmin, build_version_hdr);
break;
case LC_SOURCE_VERSION:
source_version_hdr = (struct source_version_command *) (void *) cmd_hdr;
kxld_srcversion_init_from_macho(&object->srcversion, source_version_hdr);
break;
case LC_DYSYMTAB:
object->dysymtab_hdr = (struct dysymtab_command *) cmd_hdr;
rval = kxld_reloc_create_macho(&object->extrelocs, &object->relocator,
(struct relocation_info *) ((void *) (my_file + object->dysymtab_hdr->extreloff)),
object->dysymtab_hdr->nextrel);
require_noerr(rval, finish);
rval = kxld_reloc_create_macho(&object->locrelocs, &object->relocator,
(struct relocation_info *) ((void *) (my_file + object->dysymtab_hdr->locreloff)),
object->dysymtab_hdr->nlocrel);
require_noerr(rval, finish);
break;
case LC_UNIXTHREAD:
case LC_MAIN:
/* Don't need to do anything with UNIXTHREAD or MAIN for the kernel */
require_action(kxld_object_is_kernel(object),
finish, rval = KERN_FAILURE;
kxld_log(kKxldLogLinking, kKxldLogErr, kKxldLogMalformedMachO
"LC_UNIXTHREAD/LC_MAIN segment is not valid in a kext."));
break;
case LC_SEGMENT_SPLIT_INFO:
if (isSplitKext) {
struct linkedit_data_command *split_info_hdr = NULL;
split_info_hdr = (struct linkedit_data_command *) (void *) cmd_hdr;
kxld_splitinfolc_init_from_macho(&object->splitinfolc, split_info_hdr);
}
break;
case LC_NOTE:
/* binary blob of data */
break;
case LC_CODE_SIGNATURE:
case LC_DYLD_INFO:
case LC_DYLD_INFO_ONLY:
case LC_FUNCTION_STARTS:
case LC_DATA_IN_CODE:
case LC_DYLIB_CODE_SIGN_DRS:
/* Various metadata that might be stored in the linkedit segment */
break;
default:
rval = KERN_FAILURE;
kxld_log(kKxldLogLinking, kKxldLogErr, kKxldLogMalformedMachO
"Invalid load command type in MH_KEXT_BUNDLE kext: %u.", cmd_hdr->cmd);
goto finish;
}
if (seg) {
/* Initialize the sections */
for (j = 0; j < seg->sects.nitems; ++j, ++secti) {
sect = kxld_array_get_item(&object->sects, secti);
KXLD_3264_FUNC(kxld_object_is_32_bit(object), rval,
kxld_sect_init_from_macho_32, kxld_sect_init_from_macho_64,
sect, my_file, &sect_offset, secti, &object->relocator);
require_noerr(rval, finish);
/* Add the section to the segment. This will also make sure
* that the sections and segments have the same segname.
*/
rval = kxld_seg_add_section(seg, sect);
require_noerr(rval, finish);
}
rval = kxld_seg_finish_init(seg);
require_noerr(rval, finish);
}
}
if (filetype_out) {
*filetype_out = filetype;
}
if (symtab_hdr_out) {
*symtab_hdr_out = symtab_hdr;
}
object->is_final_image = TRUE;
rval = KERN_SUCCESS;
finish:
return rval;
}
/*******************************************************************************
*******************************************************************************/
static kern_return_t
init_from_execute(KXLDObject *object)
{
kern_return_t rval = KERN_FAILURE;
struct symtab_command *symtab_hdr = NULL;
u_int filetype = 0;
KXLDSeg * kernel_linkedit_seg = NULL; // used if running kernel
#if KXLD_USER_OR_OBJECT
KXLDSeg *seg = NULL;
KXLDSect *sect = NULL;
KXLDSectionName *sname = NULL;
u_int i = 0, j = 0, k = 0;
#endif /* KXLD_USER_OR_OBJECT */
u_char *my_file;
check(object);
if (isOldInterface) {
my_file = object->file;
} else {
my_file = object->split_info.kextExecutable;
}
require_action(kxld_object_is_kernel(object), finish, rval = KERN_FAILURE);
rval = init_from_final_linked_image(object, &filetype, &symtab_hdr);
require_noerr(rval, finish);
require_action(filetype == MH_EXECUTE, finish, rval = KERN_FAILURE;
kxld_log(kKxldLogLinking, kKxldLogErr, kKxldLogMalformedMachO
"The kernel file is not of type MH_EXECUTE."));
/* Initialize the symbol table. If this is the running kernel
* we will work from the in-memory linkedit segment;
* otherwise we work from the whole mach-o image.
*/
#if KERNEL
kernel_linkedit_seg = kxld_object_get_seg_by_name(object, SEG_LINKEDIT);
require_action(kernel_linkedit_seg, finish, rval = KERN_FAILURE;
kxld_log(kKxldLogLinking, kKxldLogErr, kKxldLogMalformedMachO));
#endif
KXLD_3264_FUNC(kxld_object_is_32_bit(object), rval,
kxld_symtab_init_from_macho_32, kxld_symtab_init_from_macho_64,
object->symtab, symtab_hdr, my_file, kernel_linkedit_seg);
require_noerr(rval, finish);
#if KXLD_USER_OR_OBJECT
/* Save off the order of section names so that we can lay out kext
* sections for MH_OBJECT-based systems.
*/
if (target_supports_object(object)) {
rval = kxld_array_init(object->section_order, sizeof(KXLDSectionName),
object->sects.nitems);
require_noerr(rval, finish);
/* Copy the section names into the section_order array for future kext
* section ordering.
*/
for (i = 0, k = 0; i < object->segs.nitems; ++i) {
seg = kxld_array_get_item(&object->segs, i);
for (j = 0; j < seg->sects.nitems; ++j, ++k) {
sect = *(KXLDSect **) kxld_array_get_item(&seg->sects, j);
sname = kxld_array_get_item(object->section_order, k);
strlcpy(sname->segname, sect->segname, sizeof(sname->segname));
strlcpy(sname->sectname, sect->sectname, sizeof(sname->sectname));
}
}
}
#endif /* KXLD_USER_OR_OBJECT */
rval = KERN_SUCCESS;
finish:
return rval;
}
#if KXLD_USER_OR_BUNDLE
/*******************************************************************************
*******************************************************************************/
static boolean_t
target_supports_bundle(const KXLDObject *object __unused)
{
return TRUE;
}
/*******************************************************************************
*******************************************************************************/
static kern_return_t
init_from_bundle(KXLDObject *object)
{
kern_return_t rval = KERN_FAILURE;
struct symtab_command *symtab_hdr = NULL;
u_int filetype = 0;
u_char *my_file;
check(object);
if (isOldInterface) {
my_file = object->file;
} else {
my_file = object->split_info.kextExecutable;
}
require_action(target_supports_bundle(object), finish,
rval = KERN_FAILURE;
kxld_log(kKxldLogLinking, kKxldLogErr,
kKxldLogFiletypeNotSupported, MH_KEXT_BUNDLE));
rval = init_from_final_linked_image(object, &filetype, &symtab_hdr);
require_noerr(rval, finish);
require_action(filetype == MH_KEXT_BUNDLE, finish,
rval = KERN_FAILURE);
KXLD_3264_FUNC(kxld_object_is_32_bit(object), rval,
kxld_symtab_init_from_macho_32, kxld_symtab_init_from_macho_64,
object->symtab, symtab_hdr, my_file,
/* kernel_linkedit_seg */ NULL);
require_noerr(rval, finish);
rval = KERN_SUCCESS;
finish:
return rval;
}
#endif /* KXLD_USER_OR_BUNDLE */
#if KXLD_USER_OR_OBJECT
/*******************************************************************************
*******************************************************************************/
static boolean_t
target_supports_object(const KXLDObject *object)
{
return object->cputype == CPU_TYPE_I386;
}
/*******************************************************************************
*******************************************************************************/
static kern_return_t
init_from_object(KXLDObject *object)
{
kern_return_t rval = KERN_FAILURE;
struct load_command *cmd_hdr = NULL;
struct symtab_command *symtab_hdr = NULL;
struct uuid_command *uuid_hdr = NULL;
KXLDSect *sect = NULL;
u_long offset = 0;
u_long sect_offset = 0;
u_int filetype = 0;
u_int ncmds = 0;
u_int nsects = 0;
u_int i = 0;
boolean_t has_segment = FALSE;
u_char *my_file;
check(object);
if (isOldInterface) {
my_file = object->file;
} else {
my_file = object->split_info.kextExecutable;
}
require_action(target_supports_object(object),
finish, rval = KERN_FAILURE;
kxld_log(kKxldLogLinking, kKxldLogErr,
kKxldLogFiletypeNotSupported, MH_OBJECT));
KXLD_3264_FUNC(kxld_object_is_32_bit(object), offset,
get_macho_cmd_data_32, get_macho_cmd_data_64,
my_file, offset, &filetype, &ncmds);
require_action(filetype == MH_OBJECT, finish, rval = KERN_FAILURE);
/* MH_OBJECTs use one unnamed segment to contain all of the sections. We
* loop over all of the load commands to initialize the structures we
* expect. Then, we'll use the unnamed segment to get to all of the
* sections, and then use those sections to create the actual segments.
*/
for (; i < ncmds; ++i, offset += cmd_hdr->cmdsize) {
cmd_hdr = (struct load_command *) ((void *) (my_file + offset));
switch (cmd_hdr->cmd) {
#if KXLD_USER_OR_ILP32
case LC_SEGMENT:
{
struct segment_command *seg_hdr =
(struct segment_command *) cmd_hdr;
/* Ignore segments with no vm size */
if (!seg_hdr->vmsize) {
continue;
}
/* Ignore LINKEDIT segments */
if (streq_safe(seg_hdr->segname, SEG_LINKEDIT,
const_strlen(SEG_LINKEDIT))) {
continue;
}
require_action(kxld_object_is_32_bit(object), finish, rval = KERN_FAILURE;
kxld_log(kKxldLogLinking, kKxldLogErr, kKxldLogMalformedMachO
"LC_SEGMENT in 64-bit kext."));
require_action(!has_segment, finish, rval = KERN_FAILURE;
kxld_log(kKxldLogLinking, kKxldLogErr, kKxldLogMalformedMachO
"Multiple segments in an MH_OBJECT kext."));
nsects = seg_hdr->nsects;
sect_offset = offset + sizeof(*seg_hdr);
has_segment = TRUE;
}
break;
#endif /* KXLD_USER_OR_ILP32 */
#if KXLD_USER_OR_LP64
case LC_SEGMENT_64:
{
struct segment_command_64 *seg_hdr =
(struct segment_command_64 *) ((void *) cmd_hdr);
/* Ignore segments with no vm size */
if (!seg_hdr->vmsize) {
continue;
}
/* Ignore LINKEDIT segments */
if (streq_safe(seg_hdr->segname, SEG_LINKEDIT,
const_strlen(SEG_LINKEDIT))) {
continue;
}
require_action(!kxld_object_is_32_bit(object), finish, rval = KERN_FAILURE;
kxld_log(kKxldLogLinking, kKxldLogErr, kKxldLogMalformedMachO
"LC_SEGMENT_64 in a 32-bit kext."));
require_action(!has_segment, finish, rval = KERN_FAILURE;
kxld_log(kKxldLogLinking, kKxldLogErr, kKxldLogMalformedMachO
"Multiple segments in an MH_OBJECT kext."));
nsects = seg_hdr->nsects;
sect_offset = offset + sizeof(*seg_hdr);
has_segment = TRUE;
}
break;
#endif /* KXLD_USER_OR_LP64 */
case LC_SYMTAB:
symtab_hdr = (struct symtab_command *) cmd_hdr;
KXLD_3264_FUNC(kxld_object_is_32_bit(object), rval,
kxld_symtab_init_from_macho_32, kxld_symtab_init_from_macho_64,
object->symtab, symtab_hdr, my_file,
/* kernel_linkedit_seg */ NULL);
require_noerr(rval, finish);
break;
case LC_UUID:
uuid_hdr = (struct uuid_command *) cmd_hdr;
kxld_uuid_init_from_macho(&object->uuid, uuid_hdr);
break;
case LC_UNIXTHREAD:
case LC_MAIN:
/* Don't need to do anything with UNIXTHREAD or MAIN */
break;
case LC_CODE_SIGNATURE:
case LC_DYLD_INFO:
case LC_DYLD_INFO_ONLY:
case LC_FUNCTION_STARTS:
case LC_DATA_IN_CODE:
case LC_DYLIB_CODE_SIGN_DRS:
/* Various metadata that might be stored in the linkedit segment */
break;
case LC_NOTE:
/* bag-of-bits carried with the binary: ignore */
break;
case LC_BUILD_VERSION:
/* should be able to ignore build version commands */
kxld_log(kKxldLogLinking, kKxldLogWarn,
"Ignoring LC_BUILD_VERSION (%u) in MH_OBJECT kext: (platform:%d)",
cmd_hdr->cmd, ((struct build_version_command *)cmd_hdr)->platform);
break;
case LC_VERSION_MIN_MACOSX:
case LC_VERSION_MIN_IPHONEOS:
case LC_VERSION_MIN_TVOS:
case LC_VERSION_MIN_WATCHOS:
case LC_SOURCE_VERSION:
/* Not supported for object files, fall through */
default:
rval = KERN_FAILURE;
kxld_log(kKxldLogLinking, kKxldLogErr, kKxldLogMalformedMachO
"Invalid load command type in MH_OBJECT kext: %u.", cmd_hdr->cmd);
goto finish;
}
}
if (has_segment) {
/* Get the number of sections from the segment and build the section index */
rval = kxld_array_init(&object->sects, sizeof(KXLDSect), nsects);
require_noerr(rval, finish);
/* Loop over all of the sections to initialize the section index */
for (i = 0; i < nsects; ++i) {
sect = kxld_array_get_item(&object->sects, i);
KXLD_3264_FUNC(kxld_object_is_32_bit(object), rval,
kxld_sect_init_from_macho_32, kxld_sect_init_from_macho_64,
sect, my_file, &sect_offset, i, &object->relocator);
require_noerr(rval, finish);
}
/* Create special sections */
#if KXLD_USER_OR_GOT
rval = create_got(object);
require_noerr(rval, finish);
#endif /* KXLD_USER_OR_GOT */
#if KXLD_USER_OR_COMMON
rval = resolve_common_symbols(object);
require_noerr(rval, finish);
#endif /* KXLD_USER_OR_COMMON */
/* Create the segments from the section index */
rval = kxld_seg_create_seg_from_sections(&object->segs, &object->sects);
require_noerr(rval, finish);
rval = kxld_seg_finalize_object_segment(&object->segs,
object->section_order, get_macho_header_size(object));
require_noerr(rval, finish);
rval = kxld_seg_init_linkedit(&object->segs);
require_noerr(rval, finish);
}
rval = KERN_SUCCESS;
finish:
return rval;
}
#endif /* KXLD_USER_OR_OBJECT */
#if KXLD_USER_OR_ILP32
/*******************************************************************************
*******************************************************************************/
static u_long
get_macho_cmd_data_32(u_char *file, u_long offset, u_int *filetype, u_int *ncmds)
{
struct mach_header *mach_hdr = (struct mach_header *) ((void *) (file + offset));
if (filetype) {
*filetype = mach_hdr->filetype;
}
if (ncmds) {
*ncmds = mach_hdr->ncmds;
}
return sizeof(*mach_hdr);
}
#endif /* KXLD_USER_OR_ILP32 */
#if KXLD_USER_OR_LP64
/*******************************************************************************
*******************************************************************************/
static u_long
get_macho_cmd_data_64(u_char *file, u_long offset, u_int *filetype, u_int *ncmds)
{
struct mach_header_64 *mach_hdr = (struct mach_header_64 *) ((void *) (file + offset));
if (filetype) {
*filetype = mach_hdr->filetype;
}
if (ncmds) {
*ncmds = mach_hdr->ncmds;
}
return sizeof(*mach_hdr);
}
#endif /* KXLD_USER_OR_LP64 */
/*******************************************************************************
*******************************************************************************/
static u_long
get_macho_header_size(const KXLDObject *object)
{
KXLDSeg *seg = NULL;
u_long header_size = 0;
u_int i = 0;
boolean_t object_is_32_bit = kxld_object_is_32_bit(object);
check(object);
/* Mach, segment, symtab, and UUID headers */
header_size += object_is_32_bit ? sizeof(struct mach_header) : sizeof(struct mach_header_64);
for (i = 0; i < object->segs.nitems; ++i) {
seg = kxld_array_get_item(&object->segs, i);
header_size += kxld_seg_get_macho_header_size(seg, object_is_32_bit);
}
header_size += kxld_symtab_get_macho_header_size();
#if KXLD_PIC_KEXTS
if (target_supports_slideable_kexts(object)) {
header_size += kxld_reloc_get_macho_header_size();
}
#endif /* KXLD_PIC_KEXTS */
if (object->uuid.has_uuid) {
header_size += kxld_uuid_get_macho_header_size();
}
if (object->versionmin.has_versionmin) {
header_size += kxld_versionmin_get_macho_header_size(&object->versionmin);
}
if (object->srcversion.has_srcversion) {
header_size += kxld_srcversion_get_macho_header_size();
}
if (isSplitKext && object->splitinfolc.has_splitinfolc) {
header_size += kxld_splitinfolc_get_macho_header_size();
}
return header_size;
}
/*******************************************************************************
*******************************************************************************/
static u_long
get_macho_data_size(const KXLDObject *object)
{
KXLDSeg *seg = NULL;
u_long data_size = 0;
u_int i = 0;
check(object);
/* total all segment vmsize values */
for (i = 0; i < object->segs.nitems; ++i) {
seg = kxld_array_get_item(&object->segs, i);
data_size += (u_long) kxld_seg_get_vmsize(seg);
}
#if KXLD_PIC_KEXTS
{
/* ensure that when we eventually emit the final linked object,
* appending the __DYSYMTAB data after the __LINKEDIT data will
* not overflow the space allocated for the __LINKEDIT segment
*/
u_long seg_vmsize = 0;
u_long symtab_size = 0;
u_long reloc_size = 0;
/* get current __LINKEDIT sizes */
seg = kxld_object_get_seg_by_name(object, SEG_LINKEDIT);
seg_vmsize = (u_long) kxld_seg_get_vmsize(seg);
/* get size of symbol table data that will eventually be dumped
* into the __LINKEDIT segment
*/
symtab_size = kxld_symtab_get_macho_data_size(object->symtab, kxld_object_is_32_bit(object));
if (target_supports_slideable_kexts(object)) {
/* get size of __DYSYMTAB relocation entries */
reloc_size = kxld_reloc_get_macho_data_size(&object->locrelocs, &object->extrelocs);
}
/* combine, and ensure they'll both fit within the page(s)
* allocated for the __LINKEDIT segment. If they'd overflow,
* increase the vmsize appropriately so no overflow will occur
*/
if ((symtab_size + reloc_size) > seg_vmsize) {
u_long overflow = (symtab_size + reloc_size) - seg_vmsize;
data_size += kxld_round_page_cross_safe(overflow);
}
}
#endif // KXLD_PIC_KEXTS
return data_size;
}
/*******************************************************************************
*******************************************************************************/
boolean_t
kxld_object_target_needs_swap(const KXLDObject *object __unused)
{
#if KERNEL
return FALSE;
#else
return object->target_order != object->host_order;
#endif /* KERNEL */
}
/*******************************************************************************
*******************************************************************************/
KXLDSeg *
kxld_object_get_seg_by_name(const KXLDObject *object, const char *segname)
{
KXLDSeg *seg = NULL;
u_int i = 0;
for (i = 0; i < object->segs.nitems; ++i) {
seg = kxld_array_get_item(&object->segs, i);
if (streq_safe(segname, seg->segname, sizeof(seg->segname))) {
break;
}
seg = NULL;
}
return seg;
}
/*******************************************************************************
*******************************************************************************/
const KXLDRelocator *
kxld_object_get_relocator(const KXLDObject * object)
{
check(object);
return &object->relocator;
}
/*******************************************************************************
*******************************************************************************/
KXLDSect *
kxld_object_get_sect_by_name(const KXLDObject *object, const char *segname,
const char *sectname)
{
KXLDSect *sect = NULL;
u_int i = 0;
for (i = 0; i < object->sects.nitems; ++i) {
sect = kxld_array_get_item(&object->sects, i);
if (streq_safe(segname, sect->segname, sizeof(sect->segname)) &&
streq_safe(sectname, sect->sectname, sizeof(sect->sectname))) {
break;
}
sect = NULL;
}
return sect;
}
/*******************************************************************************
*******************************************************************************/
const KXLDReloc *
kxld_object_get_reloc_at_symbol(const KXLDObject *object, const KXLDSym *sym)
{
const KXLDReloc *reloc = NULL;
const KXLDSect *sect = NULL;
uint32_t offset = 0;
check(object);
check(sym);
sect = kxld_object_get_section_by_index(object, sym->sectnum);
require(sect, finish);
if (kxld_object_is_final_image(object)) {
reloc = kxld_reloc_get_reloc_by_offset(&object->extrelocs,
sym->base_addr);
if (!reloc) {
reloc = kxld_reloc_get_reloc_by_offset(&object->locrelocs,
sym->base_addr);
}
} else {
offset = kxld_sym_get_section_offset(sym, sect);
reloc = kxld_reloc_get_reloc_by_offset(&sect->relocs, offset);
}
finish:
return reloc;
}
/*******************************************************************************
*******************************************************************************/
const KXLDSym *
kxld_object_get_symbol_of_reloc(const KXLDObject *object,
const KXLDReloc *reloc, const KXLDSect *sect)
{
const KXLDSym *sym = NULL;
u_char *my_file;
if (isOldInterface) {
my_file = object->file;
} else {
my_file = object->split_info.kextExecutable;
}
if (kxld_object_is_final_image(object)) {
sym = kxld_reloc_get_symbol(&object->relocator, reloc, my_file);
} else {
sym = kxld_reloc_get_symbol(&object->relocator, reloc, sect->data);
}
return sym;
}
/*******************************************************************************
*******************************************************************************/
const KXLDSect *
kxld_object_get_section_by_index(const KXLDObject *object, u_int sectnum)
{
KXLDSect *sect = NULL;
check(object);
if (sectnum < object->sects.nitems) {
sect = kxld_array_get_item(&object->sects, sectnum);
}
return sect;
}
/*******************************************************************************
*******************************************************************************/
const KXLDArray *
kxld_object_get_extrelocs(const KXLDObject *object)
{
const KXLDArray *rval = NULL;
check(object);
if (kxld_object_is_final_image(object)) {
rval = &object->extrelocs;
}
return rval;
}
/*******************************************************************************
*******************************************************************************/
const KXLDSymtab *
kxld_object_get_symtab(const KXLDObject *object)
{
check(object);
return object->symtab;
}
#if KXLD_USER_OR_GOT || KXLD_USER_OR_COMMON
/*******************************************************************************
*******************************************************************************/
static kern_return_t
add_section(KXLDObject *object, KXLDSect **sect)
{
kern_return_t rval = KERN_FAILURE;
u_int nsects = object->sects.nitems;
rval = kxld_array_resize(&object->sects, nsects + 1);
require_noerr(rval, finish);
*sect = kxld_array_get_item(&object->sects, nsects);
rval = KERN_SUCCESS;
finish:
return rval;
}
#endif /* KXLD_USER_OR_GOT || KXLD_USER_OR_COMMON */
#if KXLD_USER_OR_COMMON
/*******************************************************************************
* If there are common symbols, calculate how much space they'll need
* and create/grow the __DATA __common section to accommodate them.
* Then, resolve them against that section.
*******************************************************************************/
static kern_return_t
resolve_common_symbols(KXLDObject *object)
{
kern_return_t rval = KERN_FAILURE;
KXLDSymtabIterator iter;
KXLDSym *sym = NULL;
KXLDSect *sect = NULL;
kxld_addr_t base_addr = 0;
kxld_size_t size = 0;
kxld_size_t total_size = 0;
u_int align = 0;
u_int max_align = 0;
u_int sectnum = 0;
if (!kxld_object_target_supports_common_symbols(object)) {
rval = KERN_SUCCESS;
goto finish;
}
/* Iterate over the common symbols to calculate their total aligned size */
kxld_symtab_iterator_init(&iter, object->symtab, kxld_sym_is_common, FALSE);
while ((sym = kxld_symtab_iterator_get_next(&iter))) {
align = kxld_sym_get_common_align(sym);
size = kxld_sym_get_common_size(sym);
if (align > max_align) {
max_align = align;
}
total_size = kxld_align_address(total_size, align) + size;
}
/* If there are common symbols, grow or create the __DATA __common section
* to hold them.
*/
if (total_size) {
sect = kxld_object_get_sect_by_name(object, SEG_DATA, SECT_COMMON);
if (sect) {
base_addr = sect->base_addr + sect->size;
kxld_sect_grow(sect, total_size, max_align);
} else {
base_addr = 0;
rval = add_section(object, &sect);
require_noerr(rval, finish);
kxld_sect_init_zerofill(sect, SEG_DATA, SECT_COMMON,
total_size, max_align);
}
/* Resolve the common symbols against the new section */
rval = kxld_array_get_index(&object->sects, sect, &sectnum);
require_noerr(rval, finish);
kxld_symtab_iterator_reset(&iter);
while ((sym = kxld_symtab_iterator_get_next(&iter))) {
align = kxld_sym_get_common_align(sym);
size = kxld_sym_get_common_size(sym);
base_addr = kxld_align_address(base_addr, align);
kxld_sym_resolve_common(sym, sectnum, base_addr);
base_addr += size;
}
}
rval = KERN_SUCCESS;
finish:
return rval;
}
#endif /* KXLD_USER_OR_COMMON */
#if KXLD_USER_OR_GOT
/*******************************************************************************
*******************************************************************************/
static boolean_t
target_has_got(const KXLDObject *object)
{
return FALSE:
}
/*******************************************************************************
* Create and initialize the Global Offset Table
*******************************************************************************/
static kern_return_t
create_got(KXLDObject *object)
{
kern_return_t rval = KERN_FAILURE;
KXLDSect *sect = NULL;
u_int ngots = 0;
u_int i = 0;
if (!target_has_got(object)) {
rval = KERN_SUCCESS;
goto finish;
}
for (i = 0; i < object->sects.nitems; ++i) {
sect = kxld_array_get_item(&object->sects, i);
ngots += kxld_sect_get_ngots(sect, &object->relocator,
object->symtab);
}
rval = add_section(object, &sect);
require_noerr(rval, finish);
rval = kxld_sect_init_got(sect, ngots);
require_noerr(rval, finish);
object->got_is_created = TRUE;
rval = KERN_SUCCESS;
finish:
return rval;
}
/*******************************************************************************
*******************************************************************************/
static kern_return_t
populate_got(KXLDObject *object)
{
kern_return_t rval = KERN_FAILURE;
KXLDSect *sect = NULL;
u_int i = 0;
if (!target_has_got(object) || !object->got_is_created) {
rval = KERN_SUCCESS;
goto finish;
}
for (i = 0; i < object->sects.nitems; ++i) {
sect = kxld_array_get_item(&object->sects, i);
if (streq_safe(sect->segname, KXLD_SEG_GOT, sizeof(KXLD_SEG_GOT)) &&
streq_safe(sect->sectname, KXLD_SECT_GOT, sizeof(KXLD_SECT_GOT))) {
kxld_sect_populate_got(sect, object->symtab,
kxld_object_target_needs_swap(object));
break;
}
}
require_action(i < object->sects.nitems, finish, rval = KXLD_MISSING_GOT);
rval = KERN_SUCCESS;
finish:
return rval;
}
#endif /* KXLD_USER_OR_GOT */
/*******************************************************************************
*******************************************************************************/
static boolean_t
target_supports_protected_segments(const KXLDObject *object)
{
return object->is_final_image &&
(object->cputype == CPU_TYPE_X86_64 ||
object->cputype == CPU_TYPE_ARM ||
object->cputype == CPU_TYPE_ARM64);
}
/*******************************************************************************
*******************************************************************************/
static void
set_is_object_linked(KXLDObject *object)
{
u_int i = 0;
if (kxld_object_is_kernel(object)) {
object->is_linked = TRUE;
return;
}
if (object->is_final_image) {
object->is_linked = !object->extrelocs.nitems;
return;
}
object->is_linked = TRUE;
for (i = 0; i < object->sects.nitems; ++i) {
KXLDSect *sect = kxld_array_get_item(&object->sects, i);
if (sect->relocs.nitems) {
object->is_linked = FALSE;
break;
}
}
}
/*******************************************************************************
*******************************************************************************/
void
kxld_object_clear(KXLDObject *object)
{
KXLDSeg *seg = NULL;
KXLDSect *sect = NULL;
u_int i;
u_char *my_file;
check(object);
if (isOldInterface) {
my_file = object->file;
} else {
my_file = object->split_info.kextExecutable;
}
#if !KERNEL
if (kxld_object_is_kernel(object)) {
unswap_macho(my_file, object->host_order, object->target_order);
}
#endif /* !KERNEL */
for (i = 0; i < object->segs.nitems; ++i) {
seg = kxld_array_get_item(&object->segs, i);
kxld_seg_clear(seg);
}
kxld_array_reset(&object->segs);
for (i = 0; i < object->sects.nitems; ++i) {
sect = kxld_array_get_item(&object->sects, i);
kxld_sect_clear(sect);
}
kxld_array_reset(&object->sects);
kxld_array_reset(&object->extrelocs);
kxld_array_reset(&object->locrelocs);
kxld_relocator_clear(&object->relocator);
kxld_uuid_clear(&object->uuid);
kxld_versionmin_clear(&object->versionmin);
kxld_srcversion_clear(&object->srcversion);
if (object->symtab) {
kxld_symtab_clear(object->symtab);
}
if (isOldInterface) {
object->file = NULL;
object->size = 0;
} else {
kxld_splitinfolc_clear(&object->splitinfolc);
object->split_info.kextExecutable = NULL;
object->split_info.kextSize = 0;
}
object->filetype = 0;
object->cputype = 0;
object->cpusubtype = 0;
object->is_kernel = FALSE;
object->is_final_image = FALSE;
object->is_linked = FALSE;
object->got_is_created = FALSE;
#if KXLD_USER_OR_OBJECT
object->section_order = NULL;
#endif
#if !KERNEL
object->host_order = 0;
object->target_order = 0;
#endif
}
/*******************************************************************************
*******************************************************************************/
void
kxld_object_deinit(KXLDObject *object __unused)
{
KXLDSeg *seg = NULL;
KXLDSect *sect = NULL;
u_int i;
u_char *my_file;
check(object);
if (isOldInterface) {
my_file = object->file;
} else {
my_file = object->split_info.kextExecutable;
}
#if !KERNEL
if (my_file && kxld_object_is_kernel(object)) {
unswap_macho(my_file, object->host_order, object->target_order);
}
#endif /* !KERNEL */
for (i = 0; i < object->segs.maxitems; ++i) {
seg = kxld_array_get_slot(&object->segs, i);
kxld_seg_deinit(seg);
}
kxld_array_deinit(&object->segs);
for (i = 0; i < object->sects.maxitems; ++i) {
sect = kxld_array_get_slot(&object->sects, i);
kxld_sect_deinit(sect);
}
kxld_array_deinit(&object->sects);
kxld_array_deinit(&object->extrelocs);
kxld_array_deinit(&object->locrelocs);
if (object->symtab) {
kxld_symtab_deinit(object->symtab);
kxld_free(object->symtab, kxld_symtab_sizeof());
}
bzero(object, sizeof(*object));
}
/*******************************************************************************
*******************************************************************************/
const u_char *
kxld_object_get_file(const KXLDObject *object)
{
const u_char *my_file;
check(object);
if (isOldInterface) {
my_file = object->file;
} else {
my_file = object->split_info.kextExecutable;
}
return my_file;
}
/*******************************************************************************
*******************************************************************************/
const char *
kxld_object_get_name(const KXLDObject *object)
{
check(object);
return object->name;
}
/*******************************************************************************
*******************************************************************************/
boolean_t
kxld_object_is_32_bit(const KXLDObject *object)
{
check(object);
return kxld_is_32_bit(object->cputype);
}
/*******************************************************************************
*******************************************************************************/
boolean_t
kxld_object_is_final_image(const KXLDObject *object)
{
check(object);
return object->is_final_image;
}
/*******************************************************************************
*******************************************************************************/
boolean_t
kxld_object_is_kernel(const KXLDObject *object)
{
check(object);
return object->is_kernel;
}
/*******************************************************************************
*******************************************************************************/
boolean_t
kxld_object_is_linked(const KXLDObject *object)
{
check(object);
return object->is_linked;
}
/*******************************************************************************
*******************************************************************************/
boolean_t
kxld_object_target_supports_strict_patching(const KXLDObject *object)
{
check(object);
return object->cputype != CPU_TYPE_I386;
}
/*******************************************************************************
*******************************************************************************/
boolean_t
kxld_object_target_supports_common_symbols(const KXLDObject *object)
{
check(object);
return object->cputype == CPU_TYPE_I386;
}
/*******************************************************************************
*******************************************************************************/
void
kxld_object_get_vmsize_for_seg_by_name(const KXLDObject *object,
const char *segname,
u_long *vmsize)
{
check(object);
check(segname);
check(vmsize);
KXLDSeg *seg = NULL;
u_long my_size = 0;
/* segment vmsize */
seg = kxld_object_get_seg_by_name(object, segname);
my_size = (u_long) kxld_seg_get_vmsize(seg);
#if KXLD_PIC_KEXTS
if (kxld_seg_is_linkedit_seg(seg)) {
u_long reloc_size = 0;
if (target_supports_slideable_kexts(object)) {
/* get size of __DYSYMTAB relocation entries */
reloc_size = kxld_reloc_get_macho_data_size(&object->locrelocs, &object->extrelocs);
my_size += reloc_size;
}
}
#endif
*vmsize = my_size;
}
/*******************************************************************************
*******************************************************************************/
void
kxld_object_get_vmsize(const KXLDObject *object, u_long *header_size,
u_long *vmsize)
{
check(object);
check(header_size);
check(vmsize);
*header_size = 0;
*vmsize = 0;
/* vmsize is the padded header page(s) + segment vmsizes */
*header_size = (object->is_final_image) ?
0 : (u_long)kxld_round_page_cross_safe(get_macho_header_size(object));
*vmsize = *header_size + get_macho_data_size(object);
}
/*******************************************************************************
*******************************************************************************/
void
kxld_object_set_linked_object_size(KXLDObject *object, u_long vmsize)
{
check(object);
if (isOldInterface) {
object->output_buffer_size = vmsize; /* cache this for use later */
} else {
object->split_info.linkedKextSize = vmsize;
}
return;
}
/*******************************************************************************
*******************************************************************************/
kern_return_t
kxld_object_export_linked_object(const KXLDObject *object,
void *linked_object
)
{
kern_return_t rval = KERN_FAILURE;
KXLDSeg *seg = NULL;
u_long size = 0;
u_long header_size = 0;
u_long header_offset = 0;
u_long data_offset = 0;
u_int ncmds = 0;
u_int i = 0;
boolean_t is_32bit_object = kxld_object_is_32_bit(object);
kxld_addr_t link_addr;
u_char *my_linked_object;
check(object);
check(linked_object);
if (isOldInterface) {
size = object->output_buffer_size;
link_addr = object->link_addr;
my_linked_object = (u_char *) linked_object;
} else {
size = ((splitKextLinkInfo *)linked_object)->linkedKextSize;
link_addr = ((splitKextLinkInfo *)linked_object)->vmaddr_TEXT;
my_linked_object = ((splitKextLinkInfo *)linked_object)->linkedKext;
}
/* Calculate the size of the headers and data */
header_size = get_macho_header_size(object);
/* Copy data to the file */
ncmds = object->segs.nitems + 1 /* LC_SYMTAB */;
#if KXLD_PIC_KEXTS
/* don't write out a DYSYMTAB segment for targets that can't digest it
*/
if (target_supports_slideable_kexts(object)) {
ncmds++; /* dysymtab */
}
#endif /* KXLD_PIC_KEXTS */
if (object->uuid.has_uuid == TRUE) {
ncmds++;
}
if (object->versionmin.has_versionmin == TRUE) {
ncmds++;
}
if (object->srcversion.has_srcversion == TRUE) {
ncmds++;
}
if (isSplitKext && object->splitinfolc.has_splitinfolc) {
ncmds++;
}
rval = export_macho_header(object, my_linked_object, ncmds, &header_offset, header_size);
require_noerr(rval, finish);
for (i = 0; i < object->segs.nitems; ++i) {
seg = kxld_array_get_item(&object->segs, i);
rval = kxld_seg_export_macho_to_vm(seg, my_linked_object, &header_offset,
header_size, size, link_addr, is_32bit_object);
require_noerr(rval, finish);
}
seg = kxld_object_get_seg_by_name(object, SEG_LINKEDIT);
data_offset = (u_long) (seg->link_addr - link_addr);
// data_offset is used to set the fileoff in the macho header load commands
rval = kxld_symtab_export_macho(object->symtab,
my_linked_object,
&header_offset,
header_size,
&data_offset, size, is_32bit_object);
require_noerr(rval, finish);
// data_offset now points past the symbol tab and strings data in the linkedit
// segment - (it was used to set new values for symoff and stroff)
#if KXLD_PIC_KEXTS
if (target_supports_slideable_kexts(object)) {
rval = kxld_reloc_export_macho(&object->relocator,
&object->locrelocs,
&object->extrelocs,
my_linked_object,
&header_offset,
header_size,
&data_offset, size);
require_noerr(rval, finish);
}
#endif /* KXLD_PIC_KEXTS */
if (object->uuid.has_uuid) {
rval = kxld_uuid_export_macho(&object->uuid, my_linked_object, &header_offset, header_size);
require_noerr(rval, finish);
}
if (object->versionmin.has_versionmin) {
rval = kxld_versionmin_export_macho(&object->versionmin, my_linked_object, &header_offset, header_size);
require_noerr(rval, finish);
}
if (object->srcversion.has_srcversion) {
rval = kxld_srcversion_export_macho(&object->srcversion, my_linked_object, &header_offset, header_size);
require_noerr(rval, finish);
}
if (isSplitKext && object->splitinfolc.has_splitinfolc) {
rval = kxld_splitinfolc_export_macho(&object->splitinfolc,
linked_object,
&header_offset,
header_size,
&data_offset,
size);
require_noerr(rval, finish);
}
#if !KERNEL
unswap_macho(my_linked_object, object->host_order, object->target_order);
#endif /* KERNEL */
rval = KERN_SUCCESS;
finish:
return rval;
}
/*******************************************************************************
*******************************************************************************/
static kern_return_t
export_macho_header(const KXLDObject *object, u_char *buf, u_int ncmds,
u_long *header_offset, u_long header_size)
{
kern_return_t rval = KERN_FAILURE;
check(object);
check(buf);
check(header_offset);
KXLD_3264_FUNC(kxld_object_is_32_bit(object), rval,
export_macho_header_32, export_macho_header_64,
object, buf, ncmds, header_offset, header_size);
require_noerr(rval, finish);
rval = KERN_SUCCESS;
finish:
return rval;
}
#if KXLD_USER_OR_ILP32
/*******************************************************************************
*******************************************************************************/
static kern_return_t
export_macho_header_32(const KXLDObject *object, u_char *buf, u_int ncmds,
u_long *header_offset, u_long header_size)
{
kern_return_t rval = KERN_FAILURE;
struct mach_header *mach = NULL;
check(object);
check(buf);
check(header_offset);
require_action(sizeof(*mach) <= header_size - *header_offset, finish,
rval = KERN_FAILURE);
mach = (struct mach_header *) ((void *) (buf + *header_offset));
mach->magic = MH_MAGIC;
mach->cputype = object->cputype;
mach->cpusubtype = object->cpusubtype;
mach->filetype = object->filetype;
mach->ncmds = ncmds;
mach->sizeofcmds = (uint32_t) (header_size - sizeof(*mach));
mach->flags = MH_NOUNDEFS;
*header_offset += sizeof(*mach);
rval = KERN_SUCCESS;
finish:
return rval;
}
#endif /* KXLD_USER_OR_ILP32 */
#if KXLD_USER_OR_LP64
/*******************************************************************************
*******************************************************************************/
static kern_return_t
export_macho_header_64(const KXLDObject *object, u_char *buf, u_int ncmds,
u_long *header_offset, u_long header_size)
{
kern_return_t rval = KERN_FAILURE;
struct mach_header_64 *mach = NULL;
check(object);
check(buf);
check(header_offset);
require_action(sizeof(*mach) <= header_size - *header_offset, finish,
rval = KERN_FAILURE);
mach = (struct mach_header_64 *) ((void *) (buf + *header_offset));
mach->magic = MH_MAGIC_64;
mach->cputype = object->cputype;
mach->cpusubtype = object->cpusubtype;
mach->filetype = object->filetype;
mach->ncmds = ncmds;
mach->sizeofcmds = (uint32_t) (header_size - sizeof(*mach));
mach->flags = MH_NOUNDEFS;
*header_offset += sizeof(*mach);
#if SPLIT_KEXTS_DEBUG
{
kxld_log(kKxldLogLinking, kKxldLogErr,
" %p >>> Start of macho header (size %lu) <%s>",
(void *) mach,
sizeof(*mach),
__func__);
kxld_log(kKxldLogLinking, kKxldLogErr,
" %p <<< End of macho header <%s>",
(void *) ((u_char *)mach + sizeof(*mach)),
__func__);
}
#endif
rval = KERN_SUCCESS;
finish:
return rval;
}
#endif /* KXLD_USER_OR_LP64 */
/*******************************************************************************
*******************************************************************************/
kern_return_t
kxld_object_index_symbols_by_name(KXLDObject *object)
{
return kxld_symtab_index_symbols_by_name(object->symtab);
}
/*******************************************************************************
*******************************************************************************/
kern_return_t
kxld_object_index_cxx_symbols_by_value(KXLDObject *object)
{
return kxld_symtab_index_cxx_symbols_by_value(object->symtab);
}
/*******************************************************************************
*******************************************************************************/
kern_return_t
kxld_object_relocate(KXLDObject *object, kxld_addr_t link_address)
{
kern_return_t rval = KERN_FAILURE;
KXLDSeg *seg = NULL;
u_int i = 0;
check(object);
object->link_addr = link_address;
/* Relocate segments (which relocates the sections) */
for (i = 0; i < object->segs.nitems; ++i) {
seg = kxld_array_get_item(&object->segs, i);
kxld_seg_relocate(seg, link_address);
} // for...
/* Relocate symbols */
rval = kxld_symtab_relocate(object->symtab, &object->sects);
require_noerr(rval, finish);
rval = KERN_SUCCESS;
finish:
return rval;
}
/*******************************************************************************
*******************************************************************************/
static KXLDSym *
get_mutable_sym(const KXLDObject *object, const KXLDSym *sym)
{
KXLDSym *rval = NULL;
kern_return_t result = KERN_FAILURE;
u_int i = 0;
result = kxld_symtab_get_sym_index(object->symtab, sym, &i);
require_noerr(result, finish);
rval = kxld_symtab_get_symbol_by_index(object->symtab, i);
require_action(rval == sym, finish, rval = NULL);
finish:
return rval;
}
/*******************************************************************************
*******************************************************************************/
kern_return_t
kxld_object_resolve_symbol(KXLDObject *object,
const KXLDSym *sym, kxld_addr_t addr)
{
kern_return_t rval = KERN_FAILURE;
KXLDSym *resolved_sym = NULL;
resolved_sym = get_mutable_sym(object, sym);
require_action(resolved_sym, finish, rval = KERN_FAILURE);
rval = kxld_sym_resolve(resolved_sym, addr);
require_noerr(rval, finish);
rval = KERN_SUCCESS;
finish:
return rval;
}
/*******************************************************************************
*******************************************************************************/
kern_return_t
kxld_object_patch_symbol(KXLDObject *object, const struct kxld_sym *sym)
{
kern_return_t rval = KERN_FAILURE;
KXLDSym *patched_sym = NULL;
patched_sym = get_mutable_sym(object, sym);
require_action(patched_sym, finish, rval = KERN_FAILURE);
(void) kxld_sym_patch(patched_sym);
rval = KERN_SUCCESS;
finish:
return rval;
}
/*******************************************************************************
*******************************************************************************/
kern_return_t
kxld_object_add_symbol(KXLDObject *object, char *name, kxld_addr_t link_addr,
const KXLDSym **sym_out)
{
kern_return_t rval = KERN_FAILURE;
KXLDSym *sym = NULL;
rval = kxld_symtab_add_symbol(object->symtab, name, link_addr, &sym);
require_noerr(rval, finish);
*sym_out = sym;
rval = KERN_SUCCESS;
finish:
return rval;
}
/*******************************************************************************
*******************************************************************************/
kern_return_t
kxld_object_process_relocations(KXLDObject *object,
const KXLDDict *patched_vtables)
{
kern_return_t rval = KERN_FAILURE;
(void) kxld_relocator_set_vtables(&object->relocator, patched_vtables);
/* Process relocation entries and populate the global offset table.
*
* For final linked images: the relocation entries are contained in a couple
* of tables hanging off the end of the symbol table. The GOT has its own
* section created by the linker; we simply need to fill it.
*
* For object files: the relocation entries are bound to each section.
* The GOT, if it exists for the target architecture, is created by kxld,
* and we must populate it according to our internal structures.
*/
if (object->is_final_image) {
#if KXLD_USER_OR_BUNDLE
rval = process_symbol_pointers(object);
require_noerr(rval, finish);
rval = process_relocs_from_tables(object);
require_noerr(rval, finish);
#else
require_action(FALSE, finish, rval = KERN_FAILURE);
#endif /* KXLD_USER_OR_BUNDLE */
} else {
#if KXLD_USER_OR_GOT
/* Populate GOT */
rval = populate_got(object);
require_noerr(rval, finish);
#endif /* KXLD_USER_OR_GOT */
#if KXLD_USER_OR_OBJECT
rval = process_relocs_from_sections(object);
require_noerr(rval, finish);
#else
require_action(FALSE, finish, rval = KERN_FAILURE);
#endif /* KXLD_USER_OR_OBJECT */
}
/* Populate kmod info structure */
rval = populate_kmod_info(object);
require_noerr(rval, finish);
rval = KERN_SUCCESS;
finish:
return rval;
}
#if KXLD_USER_OR_BUNDLE
#if SPLIT_KEXTS_DEBUG
static boolean_t kxld_show_ptr_value;
#endif
#define SECT_SYM_PTRS "__nl_symbol_ptr"
/*******************************************************************************
* Final linked images create an __nl_symbol_ptr section for the global offset
* table and for symbol pointer lookups in general. Rather than use relocation
* entries, the linker creates an "indirect symbol table" which stores indexes
* into the symbol table corresponding to the entries of this section. This
* function populates the section with the relocated addresses of those symbols.
*******************************************************************************/
static kern_return_t
process_symbol_pointers(KXLDObject *object)
{
kern_return_t rval = KERN_FAILURE;
KXLDSect *sect = NULL;
KXLDSym *sym = NULL;
int32_t *symidx = NULL;
u_char *symptr = NULL;
u_long symptrsize = 0;
u_int nsyms = 0;
u_int firstsym = 0;
u_int i = 0;
check(object);
require_action(object->is_final_image && object->dysymtab_hdr,
finish, rval = KERN_FAILURE);
/* Get the __DATA,__nl_symbol_ptr section. If it doesn't exist, we have
* nothing to do.
*/
sect = kxld_object_get_sect_by_name(object, SEG_DATA, SECT_SYM_PTRS);
if (!sect || !(sect->flags & S_NON_LAZY_SYMBOL_POINTERS)) {
rval = KERN_SUCCESS;
goto finish;
}
/* Calculate the table offset and number of entries in the section */
if (kxld_object_is_32_bit(object)) {
symptrsize = sizeof(uint32_t);
} else {
symptrsize = sizeof(uint64_t);
}
nsyms = (u_int) (sect->size / symptrsize);
firstsym = sect->reserved1;
require_action(firstsym + nsyms <= object->dysymtab_hdr->nindirectsyms,
finish, rval = KERN_FAILURE;
kxld_log(kKxldLogLinking, kKxldLogErr, kKxldLogMalformedMachO
"firstsym + nsyms > object->dysymtab_hdr->nindirectsyms"));
/* Iterate through the indirect symbol table and fill in the section of
* symbol pointers. There are three cases:
* 1) A normal symbol - put its value directly in the table
* 2) An INDIRECT_SYMBOL_LOCAL - symbols that are local and already have
* their offset from the start of the file in the section. Simply
* add the file's link address to fill this entry.
* 3) An INDIRECT_SYMBOL_ABS - prepopulated absolute symbols. No
* action is required.
*/
if (isOldInterface) {
symidx = (int32_t *) ((void *) (object->file + object->dysymtab_hdr->indirectsymoff));
} else {
symidx = (int32_t *) ((void *) (object->split_info.kextExecutable + object->dysymtab_hdr->indirectsymoff));
}
symidx += firstsym;
symptr = sect->data;
for (i = 0; i < nsyms; ++i, ++symidx, symptr += symptrsize) {
if (*symidx & INDIRECT_SYMBOL_LOCAL) {
if (*symidx & INDIRECT_SYMBOL_ABS) {
continue;
}
if (isOldInterface) {
add_to_ptr(symptr, object->link_addr, kxld_object_is_32_bit(object));
} else {
add_to_ptr(symptr, object->split_info.vmaddr_TEXT, kxld_object_is_32_bit(object));
}
} else {
sym = kxld_symtab_get_symbol_by_index(object->symtab, *symidx);
require_action(sym, finish, rval = KERN_FAILURE);
if (isOldInterface) {
add_to_ptr(symptr, sym->link_addr, kxld_object_is_32_bit(object));
} else {
add_to_ptr(symptr, object->split_info.vmaddr_TEXT, kxld_object_is_32_bit(object));
}
}
}
rval = KERN_SUCCESS;
finish:
return rval;
}
/*******************************************************************************
*******************************************************************************/
static KXLDSeg *
get_seg_by_base_addr(KXLDObject *object, kxld_addr_t base_addr)
{
KXLDSeg *seg = NULL;
kxld_addr_t start = 0;
kxld_addr_t end = 0;
u_int i = 0;
for (i = 0; i < object->segs.nitems; ++i) {
seg = kxld_array_get_item(&object->segs, i);
start = seg->base_addr;
end = seg->base_addr + seg->vmsize;
if (start <= base_addr && base_addr < end) {
return seg;
}
}
return NULL;
}
/*******************************************************************************
*******************************************************************************/
static kern_return_t
process_relocs_from_tables(KXLDObject *object)
{
kern_return_t rval = KERN_FAILURE;
KXLDReloc *reloc = NULL;
KXLDSeg *seg = NULL;
u_int i = 0;
/* Process external relocations */
for (i = 0; i < object->extrelocs.nitems; ++i) {
reloc = kxld_array_get_item(&object->extrelocs, i);
seg = get_seg_by_base_addr(object, reloc->address);
require_action(seg, finish, rval = KERN_FAILURE);
if (isOldInterface) {
rval = kxld_relocator_process_table_reloc(&object->relocator, reloc,
seg, object->link_addr);
} else {
kxld_addr_t my_link_addr = object->split_info.vmaddr_TEXT;
if (isSplitKext) {
if (kxld_seg_is_text_exec_seg(seg)) {
my_link_addr = object->split_info.vmaddr_TEXT_EXEC;
} else if (kxld_seg_is_data_seg(seg)) {
my_link_addr = object->split_info.vmaddr_DATA;
} else if (kxld_seg_is_data_const_seg(seg)) {
my_link_addr = object->split_info.vmaddr_DATA_CONST;
} else if (kxld_seg_is_llvm_cov_seg(seg)) {
my_link_addr = object->split_info.vmaddr_LLVM_COV;
} else if (kxld_seg_is_linkedit_seg(seg)) {
my_link_addr = object->split_info.vmaddr_LINKEDIT;
}
}
rval = kxld_relocator_process_table_reloc(&object->relocator,
reloc,
seg,
my_link_addr);
}
require_noerr(rval, finish);
}
/* Process local relocations */
for (i = 0; i < object->locrelocs.nitems; ++i) {
reloc = kxld_array_get_item(&object->locrelocs, i);
seg = get_seg_by_base_addr(object, reloc->address);
require_action(seg, finish, rval = KERN_FAILURE);
if (isOldInterface) {
rval = kxld_relocator_process_table_reloc(&object->relocator, reloc,
seg, object->link_addr);
} else {
kxld_addr_t my_link_addr = object->split_info.vmaddr_TEXT;
if (isSplitKext) {
if (kxld_seg_is_text_exec_seg(seg)) {
my_link_addr = object->split_info.vmaddr_TEXT_EXEC;
} else if (kxld_seg_is_data_seg(seg)) {
my_link_addr = object->split_info.vmaddr_DATA;
} else if (kxld_seg_is_data_const_seg(seg)) {
my_link_addr = object->split_info.vmaddr_DATA_CONST;
} else if (kxld_seg_is_llvm_cov_seg(seg)) {
my_link_addr = object->split_info.vmaddr_LLVM_COV;
} else if (kxld_seg_is_linkedit_seg(seg)) {
my_link_addr = object->split_info.vmaddr_LINKEDIT;
}
}
rval = kxld_relocator_process_table_reloc(&object->relocator,
reloc,
seg,
my_link_addr);
}
require_noerr(rval, finish);
}
rval = KERN_SUCCESS;
finish:
return rval;
}
/*******************************************************************************
*******************************************************************************/
static void
add_to_ptr(u_char *symptr, kxld_addr_t val, boolean_t is_32_bit)
{
if (is_32_bit) {
uint32_t *ptr = (uint32_t *) ((void *) symptr);
*ptr += (uint32_t) val;
} else {
uint64_t *ptr = (uint64_t *) ((void *) symptr);
*ptr += (uint64_t) val;
}
#if SPLIT_KEXTS_DEBUG
kxld_show_ptr_value = FALSE;
#endif
}
#endif /* KXLD_USER_OR_BUNDLE */
#if KXLD_USER_OR_OBJECT
/*******************************************************************************
*******************************************************************************/
static kern_return_t
process_relocs_from_sections(KXLDObject *object)
{
kern_return_t rval = KERN_FAILURE;
KXLDSect *sect = NULL;
u_int i = 0;
for (i = 0; i < object->sects.nitems; ++i) {
sect = kxld_array_get_item(&object->sects, i);
rval = kxld_sect_process_relocs(sect, &object->relocator);
require_noerr(rval, finish);
}
rval = KERN_SUCCESS;
finish:
return rval;
}
#endif /* KXLD_USER_OR_OBJECT */
/*******************************************************************************
*******************************************************************************/
static kern_return_t
populate_kmod_info(KXLDObject *object)
{
kern_return_t rval = KERN_FAILURE;
KXLDSect *kmodsect = NULL;
KXLDSym *kmodsym = NULL;
kmod_info_t *kmod_info = NULL;
u_long kmod_offset = 0;
u_long header_size;
u_long size;
if (kxld_object_is_kernel(object)) {
rval = KERN_SUCCESS;
goto finish;
}
kxld_object_get_vmsize(object, &header_size, &size);
kmodsym = kxld_symtab_get_locally_defined_symbol_by_name(object->symtab,
KXLD_KMOD_INFO_SYMBOL);
require_action(kmodsym, finish, rval = KERN_FAILURE;
kxld_log(kKxldLogLinking, kKxldLogErr, kKxldLogNoKmodInfo));
kmodsect = kxld_array_get_item(&object->sects, kmodsym->sectnum);
kmod_offset = (u_long) (kmodsym->base_addr - kmodsect->base_addr);
kmod_info = (kmod_info_t *) ((void *) (kmodsect->data + kmod_offset));
if (kxld_object_is_32_bit(object)) {
kmod_info_32_v1_t *kmod = (kmod_info_32_v1_t *) (kmod_info);
if (isOldInterface) {
kmod->address = (uint32_t) object->link_addr;
} else {
kmod->address = (uint32_t) object->split_info.vmaddr_TEXT;
}
kmod->size = (uint32_t) size;
kmod->hdr_size = (uint32_t) header_size;
#if !KERNEL
if (kxld_object_target_needs_swap(object)) {
kmod->address = OSSwapInt32(kmod->address);
kmod->size = OSSwapInt32(kmod->size);
kmod->hdr_size = OSSwapInt32(kmod->hdr_size);
}
#endif /* !KERNEL */
} else {
kmod_info_64_v1_t *kmod = (kmod_info_64_v1_t *) (kmod_info);
if (isOldInterface) {
kmod->address = object->link_addr;
} else {
kmod->address = object->split_info.vmaddr_TEXT;
}
kmod->size = size;
kmod->hdr_size = header_size;
#if !KERNEL
if (kxld_object_target_needs_swap(object)) {
kmod->address = OSSwapInt64(kmod->address);
kmod->size = OSSwapInt64(kmod->size);
kmod->hdr_size = OSSwapInt64(kmod->hdr_size);
}
#endif /* !KERNEL */
#if SPLIT_KEXTS_DEBUG
{
kxld_log(kKxldLogLinking, kKxldLogErr,
" kmodsect %p kmod_info %p = kmodsect->data %p + kmod_offset %lu <%s>",
(void *) kmodsect,
(void *) kmod_info,
(void *) kmodsect->data,
kmod_offset,
__func__);
kxld_log(kKxldLogLinking, kKxldLogErr,
" kmod_info data: address %p size %llu hdr_size %llu start_addr %p stop_addr %p <%s>",
(void *) kmod->address,
kmod->size,
kmod->hdr_size,
(void *) kmod->start_addr,
(void *) kmod->stop_addr,
__func__);
}
#endif
}
rval = KERN_SUCCESS;
finish:
return rval;
}
#if KXLD_PIC_KEXTS
/*******************************************************************************
*******************************************************************************/
static boolean_t
target_supports_slideable_kexts(const KXLDObject *object)
{
check(object);
return object->cputype != CPU_TYPE_I386 && object->include_kaslr_relocs;
}
#endif /* KXLD_PIC_KEXTS */
#pragma clang diagnostic pop
Reference in a new issue View git blame Copy permalink