forked from aosm/kext_tools
/
kctool_main.c
470 lines (395 loc) · 15.7 KB
/
kctool_main.c
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#include <CoreFoundation/CoreFoundation.h>
#include <System/libkern/OSKextLibPrivate.h>
#include <System/libkern/prelink.h>
#include <IOKit/kext/OSKext.h>
#include <IOKit/kext/OSKextPrivate.h>
#include <IOKit/IOCFUnserialize.h>
#include <IOKit/kext/macho_util.h>
#include <architecture/byte_order.h>
#include <errno.h>
#include <libc.h>
#include <mach-o/fat.h>
#include <sys/mman.h>
#include "kctool_main.h"
#include "compression.h"
/*******************************************************************************
* Program Globals
*******************************************************************************/
const char * progname = "(unknown)";
/*******************************************************************************
*******************************************************************************/
int main(int argc, char * const argv[])
{
ExitStatus result = EX_SOFTWARE;
KctoolArgs toolArgs;
int kernelcache_fd = -1; // must close()
void * fat_header = NULL; // must unmapFatHeaderPage()
struct fat_arch * fat_arch = NULL;
CFDataRef rawKernelcache = NULL; // must release
CFDataRef kernelcacheImage = NULL; // must release
void * prelinkInfoSect = NULL;
const char * prelinkInfoBytes = NULL;
CFPropertyListRef prelinkInfoPlist = NULL; // must release
bzero(&toolArgs, sizeof(toolArgs));
/*****
* Find out what the program was invoked as.
*/
progname = rindex(argv[0], '/');
if (progname) {
progname++; // go past the '/'
} else {
progname = (char *)argv[0];
}
/* Set the OSKext log callback right away.
*/
OSKextSetLogOutputFunction(&tool_log);
/*****
* Process args & check for permission to load.
*/
result = readArgs(&argc, &argv, &toolArgs);
if (result != EX_OK) {
if (result == kKctoolExitHelp) {
result = EX_OK;
}
goto finish;
}
kernelcache_fd = open(toolArgs.kernelcachePath, O_RDONLY);
if (kernelcache_fd == -1) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogGeneralFlag,
"Can't open %s: %s.", toolArgs.kernelcachePath, strerror(errno));
result = EX_OSERR;
goto finish;
}
fat_header = mapAndSwapFatHeaderPage(kernelcache_fd);
if (!fat_header) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogGeneralFlag,
"Can't map %s: %s.", toolArgs.kernelcachePath, strerror(errno));
result = EX_OSERR;
goto finish;
}
fat_arch = getFirstFatArch(fat_header);
if (fat_arch && !toolArgs.archInfo) {
toolArgs.archInfo = NXGetArchInfoFromCpuType(fat_arch->cputype, fat_arch->cpusubtype);
}
rawKernelcache = readMachOSliceForArch(toolArgs.kernelcachePath, toolArgs.archInfo,
/* checkArch */ FALSE);
if (!rawKernelcache) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogGeneralFlag,
"Can't read arch %s from %s.", toolArgs.archInfo->name, toolArgs.kernelcachePath);
goto finish;
}
if (MAGIC32(CFDataGetBytePtr(rawKernelcache)) == OSSwapHostToBigInt32('comp')) {
kernelcacheImage = uncompressPrelinkedSlice(rawKernelcache);
if (!kernelcacheImage) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogGeneralFlag,
"Can't uncompress kernelcache slice.");
goto finish;
}
} else {
kernelcacheImage = CFRetain(rawKernelcache);
}
toolArgs.kernelcacheImageBytes = CFDataGetBytePtr(kernelcacheImage);
if (ISMACHO64(MAGIC32(toolArgs.kernelcacheImageBytes))) {
prelinkInfoSect = (void *)macho_get_section_by_name_64(
(struct mach_header_64 *)toolArgs.kernelcacheImageBytes,
"__PRELINK_INFO", "__info");
} else {
prelinkInfoSect = (void *)macho_get_section_by_name(
(struct mach_header *)toolArgs.kernelcacheImageBytes,
"__PRELINK_INFO", "__info");
}
if (!prelinkInfoSect) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogGeneralFlag,
"Can't find prelink info section.");
goto finish;
}
if (ISMACHO64(MAGIC32(toolArgs.kernelcacheImageBytes))) {
prelinkInfoBytes = ((char *)toolArgs.kernelcacheImageBytes) +
((struct section_64 *)prelinkInfoSect)->offset;
} else {
prelinkInfoBytes = ((char *)toolArgs.kernelcacheImageBytes) +
((struct section *)prelinkInfoSect)->offset;
}
toolArgs.kernelcacheInfoPlist = (CFPropertyListRef)IOCFUnserialize(prelinkInfoBytes,
kCFAllocatorDefault, /* options */ 0, /* errorString */ NULL);
if (!toolArgs.kernelcacheInfoPlist) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogGeneralFlag,
"Can't unserialize prelink info.");
goto finish;
}
result = printKextInfo(&toolArgs);
if (result != EX_OK) {
goto finish;
}
result = EX_OK;
finish:
SAFE_RELEASE(toolArgs.kernelcacheInfoPlist);
SAFE_RELEASE(kernelcacheImage);
SAFE_RELEASE(rawKernelcache);
if (fat_header) {
unmapFatHeaderPage(fat_header);
}
if (kernelcache_fd != -1) {
close(kernelcache_fd);
}
return result;
}
/*******************************************************************************
*******************************************************************************/
ExitStatus readArgs(
int * argc,
char * const ** argv,
KctoolArgs * toolArgs)
{
ExitStatus result = EX_USAGE;
ExitStatus scratchResult = EX_USAGE;
int optchar = 0;
int longindex = -1;
bzero(toolArgs, sizeof(*toolArgs));
/*****
* Process command line arguments.
*/
while ((optchar = getopt_long_only(*argc, *argv,
kOptChars, sOptInfo, &longindex)) != -1) {
switch (optchar) {
case kOptArch:
toolArgs->archInfo = NXGetArchInfoFromName(optarg);
if (!toolArgs->archInfo) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogGeneralFlag,
"Unknown architecture %s.", optarg);
goto finish;
}
break;
case kOptHelp:
usage(kUsageLevelFull);
result = kKctoolExitHelp;
goto finish;
default:
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogGeneralFlag,
"unrecognized option %s", (*argv)[optind-1]);
goto finish;
break;
}
/* Reset longindex, because getopt_long_only() is stupid and doesn't.
*/
longindex = -1;
}
/* Update the argc & argv seen by main() so that boot<>root calls
* handle remaining args.
*/
*argc -= optind;
*argv += optind;
if (*argc != 4) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogGeneralFlag,
"incorrect number of arguments");
goto finish;
}
/*****
* Record remaining args from the command line.
*/
toolArgs->kernelcachePath = (*argv)[0];
toolArgs->kextID = CFStringCreateWithCString(kCFAllocatorDefault, (*argv)[1], kCFStringEncodingUTF8);
if (!toolArgs->kextID) {
OSKextLogMemError();
result = EX_OSERR;
goto finish;
}
toolArgs->segmentName = (*argv)[2];
toolArgs->sectionName = (*argv)[3];
result = EX_OK;
finish:
if (result == EX_USAGE) {
usage(kUsageLevelBrief);
}
return result;
}
/*******************************************************************************
*******************************************************************************/
static struct section *
getSectionByName(const UInt8 *file, const char *segname, const char *sectname)
{
struct mach_header *machHeader;
struct load_command *cmdHeader;
struct segment_command *segmentHeader;
struct section *sectionHeader;
u_long offset;
u_int i, j;
machHeader = (struct mach_header *) file;
if (machHeader->magic != MH_MAGIC) return NULL;
offset = sizeof(*machHeader);
for (i = 0; i < machHeader->ncmds; ++i, offset+=cmdHeader->cmdsize) {
cmdHeader = (struct load_command *) (file + offset);
if (cmdHeader->cmd != LC_SEGMENT) continue;
segmentHeader = (struct segment_command *)cmdHeader;
sectionHeader = (struct section *) (file + offset + sizeof(*segmentHeader));
for (j = 0; j < segmentHeader->nsects; ++j, ++sectionHeader) {
if (!strncmp(sectionHeader->segname, segname, sizeof(sectionHeader->segname)) &&
!strncmp(sectionHeader->sectname, sectname, sizeof(sectionHeader->sectname)))
{
return sectionHeader;
}
}
}
return NULL;
}
/*******************************************************************************
*******************************************************************************/
ExitStatus printKextInfo(KctoolArgs * toolArgs)
{
ExitStatus result = EX_SOFTWARE;
CFArrayRef kextPlistArray = NULL;
CFIndex i, count;
if (CFArrayGetTypeID() == CFGetTypeID(toolArgs->kernelcacheInfoPlist)) {
kextPlistArray = (CFArrayRef)toolArgs->kernelcacheInfoPlist;
} else if (CFDictionaryGetTypeID() == CFGetTypeID(toolArgs->kernelcacheInfoPlist)){
kextPlistArray = (CFArrayRef)CFDictionaryGetValue(toolArgs->kernelcacheInfoPlist,
CFSTR("_PrelinkInfoDictionary"));
} else {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogGeneralFlag,
"Unrecognized kernelcache plist data.");
goto finish;
}
count = CFArrayGetCount(kextPlistArray);
for (i = 0; i < count; i++) {
CFDictionaryRef kextInfoDict = (CFDictionaryRef)CFArrayGetValueAtIndex(kextPlistArray, i);
CFStringRef thisKextID = CFDictionaryGetValue(kextInfoDict, kCFBundleIdentifierKey);
if (thisKextID && CFEqual(thisKextID, toolArgs->kextID)) {
uint64_t kextAddr = 0;
uint64_t kextSize = 0;
u_long kextOffset = 0;
const UInt8 * kextMachO = NULL; // do not free
void * section = NULL; // do not free
if (!getKextAddressAndSize(kextInfoDict, &kextAddr, &kextSize)) {
goto finish;
}
if (ISMACHO64(MAGIC32(toolArgs->kernelcacheImageBytes))) {
section = (void *)macho_get_section_by_name_64(
(struct mach_header_64 *)toolArgs->kernelcacheImageBytes,
kPrelinkTextSegment, kPrelinkTextSection);
} else {
section = (void *)macho_get_section_by_name(
(struct mach_header *)toolArgs->kernelcacheImageBytes,
kPrelinkTextSegment, kPrelinkTextSection);
}
if (!section) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogGeneralFlag,
"Cannot find %s,%s in kernelcache.",
kPrelinkTextSegment, kPrelinkTextSection);
goto finish;
}
if (ISMACHO64(MAGIC32(toolArgs->kernelcacheImageBytes))) {
kextOffset = ((struct section_64 *)section)->offset + (u_long)(kextAddr - ((struct section_64 *)section)->addr);
} else {
kextOffset = ((struct section *)section)->offset + (u_long)(kextAddr - ((struct section *)section)->addr);
}
kextMachO = toolArgs->kernelcacheImageBytes + kextOffset;
/* Find the requested section's file offset and size */
if (ISMACHO64(MAGIC32(toolArgs->kernelcacheImageBytes))) {
section = (void *)macho_get_section_by_name_64(
(struct mach_header_64 *)kextMachO,
toolArgs->segmentName, toolArgs->sectionName);
} else {
/* macho_get_section_by_name doesn't work as the kexts don't have a __TEXT segment.
* They just have a single segment named "" with all the sections dumped under it.
*/
section = (void *)getSectionByName(
kextMachO,
toolArgs->segmentName, toolArgs->sectionName);
}
if (!section) {
OSKextLogCFString(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogGeneralFlag,
CFSTR("Cannot find %s,%s in kext %@\n"),
toolArgs->segmentName, toolArgs->sectionName, toolArgs->kextID);
goto finish;
}
if (ISMACHO64(MAGIC32(toolArgs->kernelcacheImageBytes))) {
printf("%#llx %#lx %#llx\n",
((struct section_64 *)section)->addr,
kextOffset + ((struct section_64 *)section)->offset,
((struct section_64 *)section)->size);
} else {
printf("%#x %#lx %#x\n",
((struct section *)section)->addr,
kextOffset + ((struct section *)section)->offset,
((struct section *)section)->size);
}
result = EX_OK;
break;
}
}
finish:
return result;
}
/*******************************************************************************
*******************************************************************************/
Boolean getKextAddressAndSize(CFDictionaryRef infoDict, uint64_t *addr, uint64_t *size)
{
Boolean result = FALSE;
CFNumberRef scratchNum = NULL; // do not release
scratchNum = CFDictionaryGetValue(infoDict, CFSTR(kPrelinkExecutableSourceKey));
if (!scratchNum) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogGeneralFlag,
"Cannot find kext load address");
goto finish;
}
if (!CFNumberGetValue(scratchNum, kCFNumberSInt64Type, addr)) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogGeneralFlag,
"Cannot convert kext load address");
goto finish;
}
scratchNum = CFDictionaryGetValue(infoDict, CFSTR(kPrelinkExecutableSizeKey));
if (!scratchNum) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogGeneralFlag,
"Cannot find kext size\n");
goto finish;
}
if (!CFNumberGetValue(scratchNum, kCFNumberSInt64Type, size)) {
OSKextLog(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogGeneralFlag,
"Cannot convert kext size\n");
goto finish;
}
result = TRUE;
finish:
return result;
}
/*******************************************************************************
* usage()
*******************************************************************************/
void usage(UsageLevel usageLevel)
{
fprintf(stderr,
"usage: %1$s [-arch archname] [--] kernelcache bundle-id segment section\n"
"usage: %1$s -help\n"
"\n",
progname);
if (usageLevel == kUsageLevelBrief) {
fprintf(stderr, "use %s -%s for an explanation of each option\n",
progname, kOptNameHelp);
}
if (usageLevel == kUsageLevelBrief) {
return;
}
fprintf(stderr, "-%s <archname>:\n"
" list info for architecture <archname>\n",
kOptNameArch);
fprintf(stderr, "\n");
fprintf(stderr, "-%s (-%c): print this message and exit\n",
kOptNameHelp, kOptHelp);
return;
}