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libdimentio.c
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/* Copyright 2023 0x7ff
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "libdimentio.h"
#include <compression.h>
#include <dlfcn.h>
#include <mach-o/fat.h>
#include <mach-o/loader.h>
#include <mach/mach.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/utsname.h>
#define LZSS_F (18)
#define LZSS_N (4096)
#define LZSS_THRESHOLD (2)
#define IPC_ENTRY_SZ (0x18)
#define OS_STRING_LEN_OFF (0xC)
#define KCOMP_HDR_PAD_SZ (0x16C)
#define OS_STRING_STRING_OFF (0x10)
#define KALLOC_ARRAY_TYPE_BIT (47U)
#define IPC_SPACE_IS_TABLE_OFF (0x20)
#define IPC_ENTRY_IE_OBJECT_OFF (0x0)
#define PROC_P_LIST_LE_PREV_OFF (0x8)
#define OS_DICTIONARY_COUNT_OFF (0x14)
#define PROC_P_LIST_LH_FIRST_OFF (0x0)
#define OS_DICTIONARY_DICT_ENTRY_OFF (0x20)
#define OS_STRING_LEN(a) extract32(a, 14, 18)
#define LOADED_KEXT_SUMMARY_HDR_NAME_OFF (0x10)
#define LOADED_KEXT_SUMMARY_HDR_ADDR_OFF (0x60)
#if TARGET_OS_OSX
# define PREBOOT_PATH "/System/Volumes/Preboot"
#else
# define PREBOOT_PATH "/private/preboot/"
#endif
#define IO_AES_ACCELERATOR_SPECIAL_KEYS_OFF (0xD0)
#define APPLE_MOBILE_AP_NONCE_CLEAR_NONCE_SEL (0xC9)
#define IO_AES_ACCELERATOR_SPECIAL_KEY_CNT_OFF (0xD8)
#define APPLE_MOBILE_AP_NONCE_GENERATE_NONCE_SEL (0xC8)
#define BOOT_PATH "/System/Library/Caches/com.apple.kernelcaches/kernelcache"
#define DER_INT (0x2U)
#define DER_SEQ (0x30U)
#define DER_IA5_STR (0x16U)
#define DER_OCTET_STR (0x4U)
#define ARM_PGSHIFT_16K (14U)
#define PROC_PIDREGIONINFO (7)
#define RD(a) extract32(a, 0, 5)
#define RN(a) extract32(a, 5, 5)
#define VM_KERN_MEMORY_OSKEXT (5)
#define KCOMP_HDR_MAGIC (0x636F6D70U)
#define ADRP_ADDR(a) ((a) & ~0xFFFULL)
#define ADRP_IMM(a) (ADR_IMM(a) << 12U)
#define IO_OBJECT_NULL ((io_object_t)0)
#define ADD_X_IMM(a) extract32(a, 10, 12)
#define kIODeviceTreePlane "IODeviceTree"
#define KCOMP_HDR_TYPE_LZSS (0x6C7A7373U)
#define LDR_X_IMM(a) (sextract64(a, 5, 19) << 2U)
#define kOSBundleLoadAddressKey "OSBundleLoadAddress"
#define IS_ADR(a) (((a) & 0x9F000000U) == 0x10000000U)
#define IS_ADRP(a) (((a) & 0x9F000000U) == 0x90000000U)
#define IS_LDR_X(a) (((a) & 0xFF000000U) == 0x58000000U)
#define IS_ADD_X(a) (((a) & 0xFFC00000U) == 0x91000000U)
#define IS_SUBS_X(a) (((a) & 0xFF200000U) == 0xEB000000U)
#define LDR_W_UNSIGNED_IMM(a) (extract32(a, 10, 12) << 2U)
#define LDR_X_UNSIGNED_IMM(a) (extract32(a, 10, 12) << 3U)
#define kBootNoncePropertyKey "com.apple.System.boot-nonce"
#define kIONVRAMDeletePropertyKey "IONVRAM-DELETE-PROPERTY"
#define kIONVRAMSyncNowPropertyKey "IONVRAM-SYNCNOW-PROPERTY"
#define IS_LDR_W_UNSIGNED_IMM(a) (((a) & 0xFFC00000U) == 0xB9400000U)
#define IS_LDR_X_UNSIGNED_IMM(a) (((a) & 0xFFC00000U) == 0xF9400000U)
#define ADR_IMM(a) ((sextract64(a, 5, 19) << 2U) | extract32(a, 29, 2))
#define kIONVRAMForceSyncNowPropertyKey "IONVRAM-FORCESYNCNOW-PROPERTY"
#ifndef SECT_CSTRING
# define SECT_CSTRING "__cstring"
#endif
#ifndef SEG_TEXT_EXEC
# define SEG_TEXT_EXEC "__TEXT_EXEC"
#endif
#ifndef MIN
# define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif
typedef char io_string_t[512];
typedef uint32_t IOOptionBits;
typedef mach_port_t io_object_t;
typedef kern_return_t (*kernrw_0_kbase_func_t)(kaddr_t *);
typedef io_object_t io_service_t, io_connect_t, io_registry_entry_t;
typedef int (*krw_0_kbase_func_t)(kaddr_t *), (*krw_0_kread_func_t)(kaddr_t, void *, size_t), (*krw_0_kwrite_func_t)(const void *, kaddr_t, size_t), (*kernrw_0_req_kernrw_func_t)(void);
typedef struct {
struct section_64 s64;
char *data;
} sec_64_t;
typedef struct {
sec_64_t sec_text, sec_cstring;
const char *kernel;
size_t kernel_sz;
char *data;
} pfinder_t;
kern_return_t
IOServiceClose(io_connect_t);
kern_return_t
IOObjectRelease(io_object_t);
CFMutableDictionaryRef
IOServiceMatching(const char *);
int
proc_pidinfo(int, int, uint64_t, void *, int);
CFDictionaryRef
OSKextCopyLoadedKextInfo(CFArrayRef, CFArrayRef);
io_registry_entry_t
IORegistryEntryFromPath(mach_port_t, const io_string_t);
io_service_t
IOServiceGetMatchingService(mach_port_t, CFDictionaryRef);
kern_return_t
IOServiceOpen(io_service_t, task_port_t, uint32_t, io_connect_t *);
kern_return_t
IORegistryEntrySetCFProperty(io_registry_entry_t, CFStringRef, CFTypeRef);
kern_return_t
mach_vm_write(vm_map_t, mach_vm_address_t, vm_offset_t, mach_msg_type_number_t);
kern_return_t
IOConnectCallStructMethod(io_connect_t, uint32_t, const void *, size_t, void *, size_t *);
CFTypeRef
IORegistryEntryCreateCFProperty(io_registry_entry_t, CFStringRef, CFAllocatorRef, IOOptionBits);
kern_return_t
mach_vm_read_overwrite(vm_map_t, mach_vm_address_t, mach_vm_size_t, mach_vm_address_t, mach_vm_size_t *);
kern_return_t
mach_vm_machine_attribute(vm_map_t, mach_vm_address_t, mach_vm_size_t, vm_machine_attribute_t, vm_machine_attribute_val_t *);
extern const mach_port_t kIOMasterPortDefault;
static int kmem_fd = -1;
static unsigned t1sz_boot;
static void *krw_0, *kernrw_0;
static kread_func_t kread_buf;
static task_t tfp0 = TASK_NULL;
static uint64_t proc_struct_sz;
static kwrite_func_t kwrite_buf;
static krw_0_kread_func_t krw_0_kread;
static krw_0_kwrite_func_t krw_0_kwrite;
static bool has_proc_struct_sz, has_kalloc_array_decode, kalloc_array_decode_v2;
static kaddr_t kbase, kernproc, proc_struct_sz_ptr, vm_kernel_link_addr, our_task;
static size_t proc_task_off, proc_p_pid_off, task_itk_space_off, io_dt_nvram_of_dict_off, ipc_port_ip_kobject_off;
static uint32_t
extract32(uint32_t val, unsigned start, unsigned len) {
return (val >> start) & (~0U >> (32U - len));
}
static uint64_t
sextract64(uint64_t val, unsigned start, unsigned len) {
return (uint64_t)((int64_t)(val << (64U - len - start)) >> (64U - len));
}
static void
kxpacd(kaddr_t *addr) {
if(t1sz_boot != 0) {
*addr |= ~((1ULL << (64U - t1sz_boot)) - 1U);
}
}
static size_t
decompress_lzss(const uint8_t *src, size_t src_len, uint8_t *dst, size_t dst_len) {
const uint8_t *src_end = src + src_len, *dst_start = dst, *dst_end = dst + dst_len;
uint16_t i, r = LZSS_N - LZSS_F, flags = 0;
uint8_t text_buf[LZSS_N + LZSS_F - 1], j;
memset(text_buf, ' ', r);
while(src != src_end && dst != dst_end) {
if(((flags >>= 1U) & 0x100U) == 0) {
flags = *src++ | 0xFF00U;
if(src == src_end) {
break;
}
}
if((flags & 1U) != 0) {
text_buf[r++] = *dst++ = *src++;
r &= LZSS_N - 1U;
} else {
i = *src++;
if(src == src_end) {
break;
}
j = *src++;
i |= (j & 0xF0U) << 4U;
j = (j & 0xFU) + LZSS_THRESHOLD;
do {
*dst++ = text_buf[r++] = text_buf[i++ & (LZSS_N - 1U)];
r &= LZSS_N - 1U;
} while(j-- != 0 && dst != dst_end);
}
}
return (size_t)(dst - dst_start);
}
static const uint8_t *
der_decode(uint8_t tag, const uint8_t *der, const uint8_t *der_end, size_t *out_len) {
size_t der_len;
if(der_end - der > 2 && tag == *der++) {
if(((der_len = *der++) & 0x80U) != 0) {
*out_len = 0;
if((der_len &= 0x7FU) <= sizeof(*out_len) && (size_t)(der_end - der) >= der_len) {
while(der_len-- != 0) {
*out_len = (*out_len << 8U) | *der++;
}
}
} else {
*out_len = der_len;
}
if(*out_len != 0 && (size_t)(der_end - der) >= *out_len) {
return der;
}
}
return NULL;
}
static const uint8_t *
der_decode_seq(const uint8_t *der, const uint8_t *der_end, const uint8_t **seq_end) {
size_t der_len;
if((der = der_decode(DER_SEQ, der, der_end, &der_len)) != NULL) {
*seq_end = der + der_len;
}
return der;
}
static const uint8_t *
der_decode_uint64(const uint8_t *der, const uint8_t *der_end, uint64_t *r) {
size_t der_len;
if((der = der_decode(DER_INT, der, der_end, &der_len)) != NULL && (*der & 0x80U) == 0 && (der_len <= sizeof(*r) || (--der_len == sizeof(*r) && *der++ == 0))) {
*r = 0;
while(der_len-- != 0) {
*r = (*r << 8U) | *der++;
}
return der;
}
return NULL;
}
static void *
kdecompress(const void *src, size_t src_len, size_t *dst_len) {
const uint8_t *der, *octet, *der_end, *src_end = (const uint8_t *)src + src_len;
struct {
uint32_t magic, type, adler32, uncomp_sz, comp_sz;
uint8_t pad[KCOMP_HDR_PAD_SZ];
} kcomp_hdr;
size_t der_len;
uint64_t r;
void *dst;
if((der = der_decode_seq(src, src_end, &der_end)) != NULL && (der = der_decode(DER_IA5_STR, der, der_end, &der_len)) != NULL && der_len == 4 && (memcmp(der, "IMG4", der_len) != 0 || ((der = der_decode_seq(der + der_len, src_end, &der_end)) != NULL && (der = der_decode(DER_IA5_STR, der, der_end, &der_len)) != NULL && der_len == 4)) && memcmp(der, "IM4P", der_len) == 0 && (der = der_decode(DER_IA5_STR, der + der_len, der_end, &der_len)) != NULL && der_len == 4 && memcmp(der, "krnl", der_len) == 0 && (der = der_decode(DER_IA5_STR, der + der_len, der_end, &der_len)) != NULL && (der = der_decode(DER_OCTET_STR, der + der_len, der_end, &der_len)) != NULL && der_len > sizeof(kcomp_hdr)) {
octet = der;
memcpy(&kcomp_hdr, octet, sizeof(kcomp_hdr));
if(kcomp_hdr.magic == __builtin_bswap32(KCOMP_HDR_MAGIC)) {
if(kcomp_hdr.type == __builtin_bswap32(KCOMP_HDR_TYPE_LZSS) && (kcomp_hdr.comp_sz = __builtin_bswap32(kcomp_hdr.comp_sz)) <= der_len - sizeof(kcomp_hdr) && (kcomp_hdr.uncomp_sz = __builtin_bswap32(kcomp_hdr.uncomp_sz)) != 0 && (dst = malloc(kcomp_hdr.uncomp_sz)) != NULL) {
if(decompress_lzss(octet + sizeof(kcomp_hdr), kcomp_hdr.comp_sz, dst, kcomp_hdr.uncomp_sz) == kcomp_hdr.uncomp_sz) {
*dst_len = kcomp_hdr.uncomp_sz;
return dst;
}
free(dst);
}
} else if((der = der_decode_seq(der + der_len, src_end, &der_end)) != NULL && (der = der_decode_uint64(der, der_end, &r)) != NULL && r == 1 && der_decode_uint64(der, der_end, &r) != NULL && r != 0 && (dst = malloc(r)) != NULL) {
if(compression_decode_buffer(dst, r, octet, der_len, NULL, COMPRESSION_LZFSE) == r) {
*dst_len = r;
return dst;
}
free(dst);
}
}
return NULL;
}
static kern_return_t
kread_buf_krw_0(kaddr_t addr, void *buf, size_t sz) {
return krw_0_kread(addr, buf, sz) == 0 ? KERN_SUCCESS : KERN_FAILURE;
}
static kern_return_t
kwrite_buf_krw_0(kaddr_t addr, const void *buf, size_t sz) {
return krw_0_kwrite(buf, addr, sz) == 0 ? KERN_SUCCESS : KERN_FAILURE;
}
static kern_return_t
init_tfp0(void) {
kern_return_t ret = task_for_pid(mach_task_self(), 0, &tfp0);
mach_port_t host;
pid_t pid;
if(ret != KERN_SUCCESS) {
host = mach_host_self();
if(MACH_PORT_VALID(host)) {
printf("host: 0x%" PRIX32 "\n", host);
ret = host_get_special_port(host, HOST_LOCAL_NODE, 4, &tfp0);
mach_port_deallocate(mach_task_self(), host);
}
}
if(ret == KERN_SUCCESS && MACH_PORT_VALID(tfp0)) {
if(pid_for_task(tfp0, &pid) == KERN_SUCCESS) {
return ret;
}
mach_port_deallocate(mach_task_self(), tfp0);
}
return KERN_FAILURE;
}
static kern_return_t
kread_buf_tfp0(kaddr_t addr, void *buf, size_t sz) {
mach_vm_address_t p = (mach_vm_address_t)buf;
mach_vm_size_t read_sz, out_sz = 0;
while(sz != 0) {
read_sz = MIN(sz, vm_kernel_page_size - (addr & vm_kernel_page_mask));
if(mach_vm_read_overwrite(tfp0, addr, read_sz, p, &out_sz) != KERN_SUCCESS || out_sz != read_sz) {
return KERN_FAILURE;
}
p += read_sz;
sz -= read_sz;
addr += read_sz;
}
return KERN_SUCCESS;
}
static kern_return_t
kwrite_buf_tfp0(kaddr_t addr, const void *buf, size_t sz) {
vm_machine_attribute_val_t mattr_val = MATTR_VAL_CACHE_FLUSH;
mach_vm_address_t p = (mach_vm_address_t)buf;
mach_msg_type_number_t write_sz;
while(sz != 0) {
write_sz = (mach_msg_type_number_t)MIN(sz, vm_kernel_page_size - (addr & vm_kernel_page_mask));
if(mach_vm_write(tfp0, addr, p, write_sz) != KERN_SUCCESS || mach_vm_machine_attribute(tfp0, addr, write_sz, MATTR_CACHE, &mattr_val) != KERN_SUCCESS) {
return KERN_FAILURE;
}
p += write_sz;
sz -= write_sz;
addr += write_sz;
}
return KERN_SUCCESS;
}
static kern_return_t
kread_buf_kmem(kaddr_t addr, void *buf, size_t sz) {
mach_vm_size_t read_sz;
char *p = buf;
ssize_t n;
while(sz != 0) {
read_sz = (mach_vm_size_t)MIN(sz, vm_kernel_page_size - (addr & vm_kernel_page_mask));
if((n = pread(kmem_fd, p, read_sz, (off_t)addr)) < 0 || (size_t)n != read_sz) {
return KERN_FAILURE;
}
p += read_sz;
sz -= read_sz;
addr += read_sz;
}
return KERN_SUCCESS;
}
static kern_return_t
kwrite_buf_kmem(kaddr_t addr, const void *buf, size_t sz) {
mach_msg_type_number_t write_sz;
const char *p = buf;
ssize_t n;
while(sz != 0) {
write_sz = (mach_msg_type_number_t)MIN(sz, vm_kernel_page_size - (addr & vm_kernel_page_mask));
if((n = pwrite(kmem_fd, p, write_sz, (off_t)addr)) < 0 || (size_t)n != write_sz) {
return KERN_FAILURE;
}
p += write_sz;
sz -= write_sz;
addr += write_sz;
}
return KERN_SUCCESS;
}
static kern_return_t
kread_addr(kaddr_t addr, kaddr_t *val) {
return kread_buf(addr, val, sizeof(*val));
}
static kern_return_t
find_section_kernel(kaddr_t p, struct segment_command_64 sg64, const char *sect_name, struct section_64 *sp) {
for(; sg64.nsects-- != 0; p += sizeof(*sp)) {
if(kread_buf(p, sp, sizeof(*sp)) != KERN_SUCCESS) {
break;
}
if((sp->flags & SECTION_TYPE) != S_ZEROFILL) {
if(sp->offset < sg64.fileoff || sp->size > sg64.filesize || sp->offset - sg64.fileoff > sg64.filesize - sp->size) {
break;
}
if(sp->size != 0 && strncmp(sp->segname, sg64.segname, sizeof(sp->segname)) == 0 && strncmp(sp->sectname, sect_name, sizeof(sp->sectname)) == 0) {
return KERN_SUCCESS;
}
}
}
return KERN_FAILURE;
}
static kern_return_t
find_section_macho(const char *p, struct segment_command_64 sg64, const char *sect_name, struct section_64 *sp) {
for(; sg64.nsects-- != 0; p += sizeof(*sp)) {
memcpy(sp, p, sizeof(*sp));
if((sp->flags & SECTION_TYPE) != S_ZEROFILL) {
if(sp->offset < sg64.fileoff || sp->size > sg64.filesize || sp->offset - sg64.fileoff > sg64.filesize - sp->size) {
break;
}
if(sp->size != 0 && strncmp(sp->segname, sg64.segname, sizeof(sp->segname)) == 0 && strncmp(sp->sectname, sect_name, sizeof(sp->sectname)) == 0) {
return KERN_SUCCESS;
}
}
}
return KERN_FAILURE;
}
static void
sec_reset(sec_64_t *sec) {
memset(&sec->s64, '\0', sizeof(sec->s64));
sec->data = NULL;
}
static void
sec_term(sec_64_t *sec) {
free(sec->data);
}
static kern_return_t
sec_read_buf(sec_64_t sec, kaddr_t addr, void *buf, size_t sz) {
size_t off;
if(addr < sec.s64.addr || sz > sec.s64.size || (off = addr - sec.s64.addr) > sec.s64.size - sz) {
return KERN_FAILURE;
}
memcpy(buf, sec.data + off, sz);
return KERN_SUCCESS;
}
static void
pfinder_reset(pfinder_t *pfinder) {
pfinder->data = NULL;
pfinder->kernel = NULL;
pfinder->kernel_sz = 0;
sec_reset(&pfinder->sec_text);
sec_reset(&pfinder->sec_cstring);
}
static void
pfinder_term(pfinder_t *pfinder) {
free(pfinder->data);
sec_term(&pfinder->sec_text);
sec_term(&pfinder->sec_cstring);
pfinder_reset(pfinder);
}
static kern_return_t
pfinder_init_macho(pfinder_t *pfinder, size_t off) {
const char *p = pfinder->kernel + off, *e;
#if TARGET_OS_OSX
struct fileset_entry_command fec;
#endif
struct segment_command_64 sg64;
struct mach_header_64 mh64;
struct load_command lc;
struct section_64 s64;
memcpy(&mh64, p, sizeof(mh64));
if(mh64.magic == MH_MAGIC_64 && mh64.cputype == CPU_TYPE_ARM64 &&
#if TARGET_OS_OSX
(mh64.filetype == MH_EXECUTE || (off == 0 && mh64.filetype == MH_FILESET))
#else
mh64.filetype == MH_EXECUTE
#endif
&& mh64.sizeofcmds < (pfinder->kernel_sz - sizeof(mh64)) - off) {
for(p += sizeof(mh64), e = p + mh64.sizeofcmds; mh64.ncmds-- != 0 && (size_t)(e - p) >= sizeof(lc); p += lc.cmdsize) {
memcpy(&lc, p, sizeof(lc));
if(lc.cmdsize < sizeof(lc) || (size_t)(e - p) < lc.cmdsize) {
break;
}
if(lc.cmd == LC_SEGMENT_64) {
if(lc.cmdsize < sizeof(sg64)) {
break;
}
memcpy(&sg64, p, sizeof(sg64));
if(sg64.vmsize == 0) {
continue;
}
if(sg64.nsects != (lc.cmdsize - sizeof(sg64)) / sizeof(s64) || sg64.fileoff > pfinder->kernel_sz || sg64.filesize > pfinder->kernel_sz - sg64.fileoff) {
break;
}
if(mh64.filetype == MH_EXECUTE) {
if(strncmp(sg64.segname, SEG_TEXT_EXEC, sizeof(sg64.segname)) == 0) {
if(find_section_macho(p + sizeof(sg64), sg64, SECT_TEXT, &s64) != KERN_SUCCESS || s64.size == 0 || (pfinder->sec_text.data = malloc(s64.size)) == NULL) {
break;
}
memcpy(pfinder->sec_text.data, pfinder->kernel + s64.offset, s64.size);
pfinder->sec_text.s64 = s64;
printf("sec_text_addr: " KADDR_FMT ", sec_text_off: 0x%" PRIX32 ", sec_text_sz: 0x%" PRIX64 "\n", s64.addr, s64.offset, s64.size);
} else if(strncmp(sg64.segname, SEG_TEXT, sizeof(sg64.segname)) == 0) {
if(find_section_macho(p + sizeof(sg64), sg64, SECT_CSTRING, &s64) != KERN_SUCCESS || s64.size == 0 || (pfinder->sec_cstring.data = calloc(1, s64.size + 1)) == NULL) {
break;
}
memcpy(pfinder->sec_cstring.data, pfinder->kernel + s64.offset, s64.size);
pfinder->sec_cstring.s64 = s64;
printf("sec_cstring_addr: " KADDR_FMT ", sec_cstring_off: 0x%" PRIX32 ", sec_cstring_sz: 0x%" PRIX64 "\n", s64.addr, s64.offset, s64.size);
}
}
}
#if TARGET_OS_OSX
else if(mh64.filetype == MH_FILESET && lc.cmd == LC_FILESET_ENTRY) {
if(lc.cmdsize < sizeof(fec)) {
break;
}
memcpy(&fec, p, sizeof(fec));
if(fec.fileoff == 0 || fec.fileoff > pfinder->kernel_sz - sizeof(mh64) || fec.entry_id.offset > fec.cmdsize || p[fec.cmdsize - 1] != '\0') {
break;
}
if(strcmp(p + fec.entry_id.offset, "com.apple.kernel") == 0 && pfinder_init_macho(pfinder, fec.fileoff) == KERN_SUCCESS) {
return KERN_SUCCESS;
}
}
#endif
if(pfinder->sec_text.s64.size != 0 && pfinder->sec_cstring.s64.size != 0) {
pfinder->sec_text.s64.addr += kbase - vm_kernel_link_addr;
pfinder->sec_cstring.s64.addr += kbase - vm_kernel_link_addr;
return KERN_SUCCESS;
}
}
}
return KERN_FAILURE;
}
#if TARGET_OS_OSX
static int
kstrcmp(kaddr_t p, const char *s0) {
size_t len = strlen(s0);
int ret = 1;
char *s;
if((s = malloc(len + 1)) != NULL) {
s[len] = '\0';
if(kread_buf(p, s, len) == KERN_SUCCESS) {
ret = strcmp(s, s0);
}
free(s);
}
return ret;
}
#endif
static kern_return_t
pfinder_init_kernel(pfinder_t *pfinder, size_t off) {
#if TARGET_OS_OSX
struct fileset_entry_command fec;
#endif
struct segment_command_64 sg64;
kaddr_t p = kbase + off, e;
struct mach_header_64 mh64;
struct load_command lc;
struct section_64 s64;
if(kread_buf(p, &mh64, sizeof(mh64)) == KERN_SUCCESS && mh64.magic == MH_MAGIC_64 && mh64.cputype == CPU_TYPE_ARM64 &&
#if TARGET_OS_OSX
(mh64.filetype == MH_EXECUTE || (off == 0 && mh64.filetype == MH_FILESET))
#else
mh64.filetype == MH_EXECUTE
#endif
) {
for(p += sizeof(mh64), e = p + mh64.sizeofcmds; mh64.ncmds-- != 0 && e - p >= sizeof(lc); p += lc.cmdsize) {
if(kread_buf(p, &lc, sizeof(lc)) != KERN_SUCCESS || lc.cmdsize < sizeof(lc) || e - p < lc.cmdsize) {
break;
}
if(lc.cmd == LC_SEGMENT_64) {
if(lc.cmdsize < sizeof(sg64) || kread_buf(p, &sg64, sizeof(sg64)) != KERN_SUCCESS) {
break;
}
if(sg64.vmsize == 0) {
continue;
}
if(sg64.nsects != (lc.cmdsize - sizeof(sg64)) / sizeof(s64)) {
break;
}
if(mh64.filetype == MH_EXECUTE) {
if(strncmp(sg64.segname, SEG_TEXT_EXEC, sizeof(sg64.segname)) == 0) {
if(find_section_kernel(p + sizeof(sg64), sg64, SECT_TEXT, &s64) != KERN_SUCCESS || s64.size == 0 || (pfinder->sec_text.data = malloc(s64.size)) == NULL || kread_buf(s64.addr, pfinder->sec_text.data, s64.size) != KERN_SUCCESS) {
break;
}
pfinder->sec_text.s64 = s64;
printf("sec_text_addr: " KADDR_FMT ", sec_text_off: 0x%" PRIX32 ", sec_text_sz: 0x%" PRIX64 "\n", s64.addr, s64.offset, s64.size);
} else if(strncmp(sg64.segname, SEG_TEXT, sizeof(sg64.segname)) == 0) {
if(find_section_kernel(p + sizeof(sg64), sg64, SECT_CSTRING, &s64) != KERN_SUCCESS || s64.size == 0 || (pfinder->sec_cstring.data = calloc(1, s64.size + 1)) == NULL || kread_buf(s64.addr, pfinder->sec_cstring.data, s64.size) != KERN_SUCCESS) {
break;
}
pfinder->sec_cstring.s64 = s64;
printf("sec_cstring_addr: " KADDR_FMT ", sec_cstring_off: 0x%" PRIX32 ", sec_cstring_sz: 0x%" PRIX64 "\n", s64.addr, s64.offset, s64.size);
}
}
}
#if TARGET_OS_OSX
else if(mh64.filetype == MH_FILESET && lc.cmd == LC_FILESET_ENTRY) {
if(lc.cmdsize < sizeof(fec) || kread_buf(p, &fec, sizeof(fec)) != KERN_SUCCESS) {
break;
}
if(fec.fileoff == 0 || fec.entry_id.offset > fec.cmdsize) {
break;
}
if(kstrcmp(p + fec.entry_id.offset, "com.apple.kernel") == 0 && pfinder_init_kernel(pfinder, fec.fileoff) == KERN_SUCCESS) {
return KERN_SUCCESS;
}
}
#endif
if(pfinder->sec_text.s64.size != 0 && pfinder->sec_cstring.s64.size != 0) {
return KERN_SUCCESS;
}
}
}
return KERN_FAILURE;
}
static kern_return_t
pfinder_init_file(pfinder_t *pfinder, const char *filename) {
kern_return_t ret = KERN_FAILURE;
struct mach_header_64 mh64;
struct fat_header fh;
struct stat stat_buf;
struct fat_arch fa;
const char *p;
size_t len;
void *m;
int fd;
pfinder_reset(pfinder);
if((fd = open(filename, O_RDONLY | O_CLOEXEC)) != -1) {
if(fstat(fd, &stat_buf) != -1 && S_ISREG(stat_buf.st_mode) && stat_buf.st_size > 0) {
len = (size_t)stat_buf.st_size;
if((m = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd, 0)) != MAP_FAILED) {
if((pfinder->data = kdecompress(m, len, &pfinder->kernel_sz)) != NULL && pfinder->kernel_sz > sizeof(fh) + sizeof(mh64)) {
pfinder->kernel = pfinder->data;
memcpy(&fh, pfinder->kernel, sizeof(fh));
if(fh.magic == __builtin_bswap32(FAT_MAGIC) && (fh.nfat_arch = __builtin_bswap32(fh.nfat_arch)) < (pfinder->kernel_sz - sizeof(fh)) / sizeof(fa)) {
for(p = pfinder->kernel + sizeof(fh); fh.nfat_arch-- != 0; p += sizeof(fa)) {
memcpy(&fa, p, sizeof(fa));
if(fa.cputype == (cpu_type_t)__builtin_bswap32(CPU_TYPE_ARM64) && (fa.offset = __builtin_bswap32(fa.offset)) < pfinder->kernel_sz && (fa.size = __builtin_bswap32(fa.size)) <= pfinder->kernel_sz - fa.offset && fa.size > sizeof(mh64)) {
pfinder->kernel_sz = fa.size;
pfinder->kernel += fa.offset;
break;
}
}
}
ret = pfinder_init_macho(pfinder, 0);
}
munmap(m, len);
}
}
close(fd);
}
if(ret != KERN_SUCCESS) {
pfinder_term(pfinder);
}
return ret;
}
static char *
get_boot_path(void) {
size_t path_len = sizeof(BOOT_PATH);
#if TARGET_OS_OSX
CFDataRef boot_objects_path_cf;
size_t boot_objects_path_len;
#else
const uint8_t *hash;
CFDataRef hash_cf;
size_t hash_len;
#endif
io_registry_entry_t chosen;
struct stat stat_buf;
char *path = NULL;
if(stat(PREBOOT_PATH, &stat_buf) != -1 && S_ISDIR(stat_buf.st_mode)) {
if((chosen = IORegistryEntryFromPath(kIOMasterPortDefault, kIODeviceTreePlane ":/chosen")) != IO_OBJECT_NULL) {
path_len += strlen(PREBOOT_PATH);
#if TARGET_OS_OSX
if((boot_objects_path_cf = IORegistryEntryCreateCFProperty(chosen, CFSTR("boot-objects-path"), kCFAllocatorDefault, kNilOptions)) != NULL) {
if(CFGetTypeID(boot_objects_path_cf) == CFDataGetTypeID() && (boot_objects_path_len = (size_t)CFDataGetLength(boot_objects_path_cf) - 1) != 0) {
path_len += boot_objects_path_len;
if((path = malloc(path_len)) != NULL) {
memcpy(path, PREBOOT_PATH, strlen(PREBOOT_PATH));
memcpy(path + strlen(PREBOOT_PATH), CFDataGetBytePtr(boot_objects_path_cf), boot_objects_path_len);
}
}
CFRelease(boot_objects_path_cf);
}
#else
if((hash_cf = IORegistryEntryCreateCFProperty(chosen, CFSTR("boot-manifest-hash"), kCFAllocatorDefault, kNilOptions)) != NULL) {
if(CFGetTypeID(hash_cf) == CFDataGetTypeID() && (hash_len = (size_t)CFDataGetLength(hash_cf) << 1U) != 0) {
path_len += hash_len;
if((path = malloc(path_len)) != NULL) {
memcpy(path, PREBOOT_PATH, strlen(PREBOOT_PATH));
for(hash = CFDataGetBytePtr(hash_cf); hash_len-- != 0; ) {
path[strlen(PREBOOT_PATH) + hash_len] = "0123456789ABCDEF"[(hash[hash_len >> 1U] >> ((~hash_len & 1U) << 2U)) & 0xFU];
}
}
}
CFRelease(hash_cf);
}
#endif
IOObjectRelease(chosen);
}
} else if(stat(BOOT_PATH, &stat_buf) != -1 && S_ISREG(stat_buf.st_mode)) {
path = malloc(path_len);
}
if(path != NULL) {
memcpy(path + (path_len - sizeof(BOOT_PATH)), BOOT_PATH, sizeof(BOOT_PATH));
}
return path;
}
static kern_return_t
pfinder_init(pfinder_t *pfinder) {
char *boot_path = get_boot_path();
kern_return_t ret = KERN_FAILURE;
pfinder_reset(pfinder);
if(boot_path != NULL) {
printf("boot_path: %s\n", boot_path);
if((ret = pfinder_init_file(pfinder, boot_path)) != KERN_SUCCESS && (ret = pfinder_init_kernel(pfinder, 0)) != KERN_SUCCESS) {
pfinder_term(pfinder);
}
free(boot_path);
} else if((ret = pfinder_init_kernel(pfinder, 0)) != KERN_SUCCESS) {
pfinder_term(pfinder);
}
return ret;
}
static kaddr_t
pfinder_xref_rd(pfinder_t pfinder, uint32_t rd, kaddr_t start, kaddr_t to) {
kaddr_t x[32] = { 0 };
uint32_t insn;
for(; sec_read_buf(pfinder.sec_text, start, &insn, sizeof(insn)) == KERN_SUCCESS; start += sizeof(insn)) {
if(IS_LDR_X(insn)) {
x[RD(insn)] = start + LDR_X_IMM(insn);
} else if(IS_ADR(insn)) {
x[RD(insn)] = start + ADR_IMM(insn);
} else if(IS_ADD_X(insn)) {
x[RD(insn)] = x[RN(insn)] + ADD_X_IMM(insn);
} else if(IS_LDR_W_UNSIGNED_IMM(insn)) {
x[RD(insn)] = x[RN(insn)] + LDR_W_UNSIGNED_IMM(insn);
} else if(IS_LDR_X_UNSIGNED_IMM(insn)) {
x[RD(insn)] = x[RN(insn)] + LDR_X_UNSIGNED_IMM(insn);
} else {
if(IS_ADRP(insn)) {
x[RD(insn)] = ADRP_ADDR(start) + ADRP_IMM(insn);
}
continue;
}
if(RD(insn) == rd) {
if(to == 0) {
return x[rd];
}
if(x[rd] == to) {
return start;
}
}
}
return 0;
}
static kaddr_t
pfinder_xref_str(pfinder_t pfinder, const char *str, uint32_t rd) {
const char *p, *e;
size_t len;
for(p = pfinder.sec_cstring.data, e = p + pfinder.sec_cstring.s64.size; p != e; p += len) {
len = strlen(p) + 1;
if(strncmp(str, p, len) == 0) {
return pfinder_xref_rd(pfinder, rd, pfinder.sec_text.s64.addr, pfinder.sec_cstring.s64.addr + (kaddr_t)(p - pfinder.sec_cstring.data));
}
}
return 0;
}
static kaddr_t
pfinder_kernproc(pfinder_t pfinder) {
kaddr_t ref = pfinder_xref_str(pfinder, "Should never have an EVFILT_READ except for reg or fifo. @%s:%d", 0);
uint32_t insns[2];
if(ref == 0) {
ref = pfinder_xref_str(pfinder, "\"Should never have an EVFILT_READ except for reg or fifo.\"", 0);
}
for(; sec_read_buf(pfinder.sec_text, ref, insns, sizeof(insns)) == KERN_SUCCESS; ref -= sizeof(*insns)) {
if(IS_ADRP(insns[0]) && IS_LDR_X_UNSIGNED_IMM(insns[1]) && RD(insns[1]) == 3) {
return pfinder_xref_rd(pfinder, RD(insns[1]), ref, 0);
}
}
return 0;
}
static kaddr_t
pfinder_proc_struct_sz_ptr(pfinder_t pfinder) {
uint32_t insns[3];
kaddr_t ref;
for(ref = pfinder_xref_str(pfinder, "panic: ticket lock acquired check done outside of kernel debugger @%s:%d", 0); sec_read_buf(pfinder.sec_text, ref, insns, sizeof(insns)) == KERN_SUCCESS; ref -= sizeof(*insns)) {
if(IS_ADRP(insns[0]) && IS_LDR_X_UNSIGNED_IMM(insns[1]) && IS_SUBS_X(insns[2]) && RD(insns[2]) == 1) {
return pfinder_xref_rd(pfinder, RD(insns[1]), ref, 0);
}
}
return 0;
}
static kern_return_t
init_kbase(void) {
struct {
uint32_t pri_prot, pri_max_prot, pri_inheritance, pri_flags;
uint64_t pri_offset;
uint32_t pri_behavior, pri_user_wired_cnt, pri_user_tag, pri_pages_resident, pri_pages_shared_now_private, pri_pages_swapped_out, pri_pages_dirtied, pri_ref_cnt, pri_shadow_depth, pri_share_mode, pri_private_pages_resident, pri_shared_pages_resident, pri_obj_id, pri_depth;
kaddr_t pri_addr;
uint64_t pri_sz;
} pri;
mach_msg_type_number_t cnt = TASK_DYLD_INFO_COUNT;
CFDictionaryRef kexts_info, kext_info;
kernrw_0_kbase_func_t kernrw_0_kbase;
kaddr_t kext_addr, kext_addr_slid;
task_dyld_info_data_t dyld_info;
krw_0_kbase_func_t krw_0_kbase;
char kext_name[KMOD_MAX_NAME];
struct mach_header_64 mh64;
CFStringRef kext_name_cf;
CFNumberRef kext_addr_cf;
CFArrayRef kext_names;
if(kbase == 0) {
if((((kernrw_0 == NULL || (kernrw_0_kbase = (kernrw_0_kbase_func_t)dlsym(kernrw_0, "kernRW_getKernelBase")) == NULL || kernrw_0_kbase(&kbase) != KERN_SUCCESS)) && (krw_0 == NULL || (krw_0_kbase = (krw_0_kbase_func_t)dlsym(krw_0, "kbase")) == NULL || krw_0_kbase(&kbase) != 0)) || tfp0 == TASK_NULL || task_info(tfp0, TASK_DYLD_INFO, (task_info_t)&dyld_info, &cnt) != KERN_SUCCESS || (kbase = vm_kernel_link_addr + dyld_info.all_image_info_size) == 0) {
for(pri.pri_addr = 0; proc_pidinfo(0, PROC_PIDREGIONINFO, pri.pri_addr, &pri, sizeof(pri)) == sizeof(pri); pri.pri_addr += pri.pri_sz) {
if(pri.pri_prot == VM_PROT_READ && pri.pri_user_tag == VM_KERN_MEMORY_OSKEXT) {
if(kread_buf(pri.pri_addr + LOADED_KEXT_SUMMARY_HDR_NAME_OFF, kext_name, sizeof(kext_name)) == KERN_SUCCESS) {
printf("kext_name: %s\n", kext_name);
if(kread_addr(pri.pri_addr + LOADED_KEXT_SUMMARY_HDR_ADDR_OFF, &kext_addr_slid) == KERN_SUCCESS) {
printf("kext_addr_slid: " KADDR_FMT "\n", kext_addr_slid);
if((kext_name_cf = CFStringCreateWithCStringNoCopy(kCFAllocatorDefault, kext_name, kCFStringEncodingUTF8, kCFAllocatorNull)) != NULL) {
if((kext_names = CFArrayCreate(kCFAllocatorDefault, (const void **)&kext_name_cf, 1, &kCFTypeArrayCallBacks)) != NULL) {
if((kexts_info = OSKextCopyLoadedKextInfo(kext_names, NULL)) != NULL) {
if(CFGetTypeID(kexts_info) == CFDictionaryGetTypeID() && CFDictionaryGetCount(kexts_info) == 1 && (kext_info = CFDictionaryGetValue(kexts_info, kext_name_cf)) != NULL && CFGetTypeID(kext_info) == CFDictionaryGetTypeID() && (kext_addr_cf = CFDictionaryGetValue(kext_info, CFSTR(kOSBundleLoadAddressKey))) != NULL && CFGetTypeID(kext_addr_cf) == CFNumberGetTypeID() && CFNumberGetValue(kext_addr_cf, kCFNumberSInt64Type, &kext_addr) && kext_addr_slid > kext_addr) {
kbase = vm_kernel_link_addr + (kext_addr_slid - kext_addr);
}
CFRelease(kexts_info);
}
CFRelease(kext_names);
}
CFRelease(kext_name_cf);
}
}
}
break;
}
}
}
}
if(kread_buf(kbase, &mh64, sizeof(mh64)) == KERN_SUCCESS && mh64.magic == MH_MAGIC_64 && mh64.cputype == CPU_TYPE_ARM64 && mh64.filetype ==
#if TARGET_OS_OSX
MH_FILESET
#else
MH_EXECUTE
#endif
) {
printf("kbase: " KADDR_FMT "\n", kbase);
return KERN_SUCCESS;
}
return KERN_FAILURE;
}
static kern_return_t
pfinder_init_offsets(void) {
kern_return_t ret = KERN_FAILURE;
struct utsname uts;
CFStringRef cf_str;
pfinder_t pfinder;
char *p, *e;
if(uname(&uts) == 0 && (p = strstr(uts.version, "root:xnu-")) != NULL && (e = strchr(p += strlen("root:xnu-"), '~')) != NULL) {
*e = '\0';
if((cf_str = CFStringCreateWithCStringNoCopy(kCFAllocatorDefault, p, kCFStringEncodingASCII, kCFAllocatorNull)) != NULL) {
proc_task_off = 0x18;
proc_p_pid_off = 0x10;
task_itk_space_off = 0x290;
io_dt_nvram_of_dict_off = 0xC0;
ipc_port_ip_kobject_off = 0x68;
#if TARGET_OS_OSX
vm_kernel_link_addr = 0xFFFFFE0007004000ULL;
#else
vm_kernel_link_addr = 0xFFFFFFF007004000ULL;
#endif
if(CFStringCompare(cf_str, CFSTR("3789.1.24"), kCFCompareNumerically) != kCFCompareLessThan) {
task_itk_space_off = 0x300;
if(CFStringCompare(cf_str, CFSTR("4397.0.0.2.4"), kCFCompareNumerically) != kCFCompareLessThan) {
task_itk_space_off = 0x308;
if(CFStringCompare(cf_str, CFSTR("4903.200.199.12.3"), kCFCompareNumerically) != kCFCompareLessThan) {
proc_task_off = 0x10;
proc_p_pid_off = 0x60;
task_itk_space_off = 0x300;
if(CFStringCompare(cf_str, CFSTR("6041.0.0.110.11"), kCFCompareNumerically) != kCFCompareLessThan) {
task_itk_space_off = 0x320;
if(CFStringCompare(cf_str, CFSTR("6110.0.0.120.8"), kCFCompareNumerically) != kCFCompareLessThan) {
proc_p_pid_off = 0x68;
if(CFStringCompare(cf_str, CFSTR("7090.0.0.110.4"), kCFCompareNumerically) != kCFCompareLessThan) {
task_itk_space_off = 0x330;
io_dt_nvram_of_dict_off = 0xB8;
if(CFStringCompare(cf_str, CFSTR("7195.50.3.201.1"), kCFCompareNumerically) != kCFCompareLessThan) {
#if TARGET_OS_OSX
io_dt_nvram_of_dict_off = 0xE0;
#else
io_dt_nvram_of_dict_off = 0xC0;
#endif
if(CFStringCompare(cf_str, CFSTR("7195.60.69"), kCFCompareNumerically) != kCFCompareLessThan) {
#if TARGET_OS_OSX
io_dt_nvram_of_dict_off = 0xE8;
#else
io_dt_nvram_of_dict_off = 0xC8;
#endif
if(CFStringCompare(cf_str, CFSTR("7195.100.296.111.3"), kCFCompareNumerically) != kCFCompareLessThan) {
task_itk_space_off = 0x340;
if(CFStringCompare(cf_str, CFSTR("7195.100.326.0.1"), kCFCompareNumerically) != kCFCompareLessThan) {
task_itk_space_off = 0x338;
if(CFStringCompare(cf_str, CFSTR("7938.0.0.111.2"), kCFCompareNumerically) != kCFCompareLessThan) {
task_itk_space_off = 0x330;
ipc_port_ip_kobject_off = 0x58;
if(CFStringCompare(cf_str, CFSTR("8019.0.46.0.4"), kCFCompareNumerically) != kCFCompareLessThan) {
#if TARGET_OS_OSX
io_dt_nvram_of_dict_off = 0xF0;
#else
io_dt_nvram_of_dict_off = 0xE8;
#endif
if(CFStringCompare(cf_str, CFSTR("8019.60.40.0.1"), kCFCompareNumerically) != kCFCompareLessThan) {
task_itk_space_off = 0x308;
if(CFStringCompare(cf_str, CFSTR("8020.100.406.0.1"), kCFCompareNumerically) != kCFCompareLessThan) {
#if TARGET_OS_OSX
io_dt_nvram_of_dict_off = 0xC0;
#else
io_dt_nvram_of_dict_off = 0xB8;
#endif
ipc_port_ip_kobject_off = 0x48;
if(CFStringCompare(cf_str, CFSTR("8792.0.50.111.3"), kCFCompareNumerically) != kCFCompareLessThan) {
proc_p_pid_off = 0x60;
has_proc_struct_sz = true;
task_itk_space_off = 0x300;
if(CFStringCompare(cf_str, CFSTR("8792.40.101.0.1"), kCFCompareNumerically) != kCFCompareLessThan) {
#if TARGET_OS_OSX
io_dt_nvram_of_dict_off = 0xC8;
#else
io_dt_nvram_of_dict_off = 0xC0;
#endif
has_kalloc_array_decode = true;
if(CFStringCompare(cf_str, CFSTR("8792.80.25.121.4"), kCFCompareNumerically) != kCFCompareLessThan) {
kalloc_array_decode_v2 = true;
}
}
}
}
}
}
}
}
}
}
}
}
}
}