Chameleon

Chameleon Commit Details

Date:2010-08-28 23:43:45 (10 years 3 months ago)
Author:Evan Lojewski
Commit:441
Parents: 440
Message:Remove kernel patcher source from boot2, module only form now on
Changes:
D/branches/meklort/i386/boot2/kernel_patcher.c
D/branches/meklort/i386/boot2/kernel_patcher.h

File differences

branches/meklort/i386/boot2/kernel_patcher.c
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/*
* Copyright (c) 2009 Evan Lojewski. All rights reserved.
*
*/
#include "libsaio.h"
#include "kernel_patcher.h"
#include "platform.h"
extern PlatformInfo_t Platform;
#define SYMBOL_CPUID_SET_INFO0
#define SYMBOL_PANIC1
#define SYMBOL_PMCPUEXITHALTTOOFF2
#define SYMBOL_LAPIC_INIT3
#define SYMBOL_COMMPAGE_STUFF_ROUTINE4
#define NUM_SYMBOLS5
#define SYMBOL_CPUID_SET_INFO_STRING"_cpuid_set_info"
#define SYMBOL_PANIC_STRING"_panic"
#define SYMBOL_PMCPUEXITHALTTOOFF_STRING"_pmCPUExitHaltToOff"
#define SYMBOL_LAPIC_INIT_STRING"_lapic_init"
#define SYMBOL_COMMPAGE_STUFF_ROUTINE_STRING"_commpage_stuff_routine"
char* kernelSymbols[NUM_SYMBOLS] = {
SYMBOL_CPUID_SET_INFO_STRING,
SYMBOL_PANIC_STRING,
SYMBOL_PMCPUEXITHALTTOOFF_STRING,
SYMBOL_LAPIC_INIT_STRING,
SYMBOL_COMMPAGE_STUFF_ROUTINE_STRING
};
UInt32 kernelSymbolAddresses[NUM_SYMBOLS] = {
0,
0,
0,
0,
0
};
UInt32 textSection = 0;
UInt32 textAddress = 0;
void patch_kernel(void* kernelData)
{
switch (locate_symbols((void*)kernelData)) {
case KERNEL_32:
patch_kernel_32((void*)kernelData);
break;
case KERNEL_64:
default:
patch_kernel_64((void*)kernelData);
break;
}
}
// patches a 64bit kernel.
void patch_kernel_64(void* kernelData)
{
// At the moment, the kernel patching code fails when used
// in 64bit mode, so we don't patch it. This is due to 32bit vs 64bit
// pointers as well as changes in structure sizes
printf("Unable to patch 64bit kernel. Please use arch=i386.\n");
}
/**
** patch_kernel_32
**patches kernel based on cpu info determined earlier in the boot process.
**It the machine is vmware, remove the artificial lapic panic
**If the CPU is not supported, remove the cpuid_set_info panic
**If the CPU is and Intel Atom, inject the penryn cpuid info.
**/
void patch_kernel_32(void* kernelData)
{
// Remove panic in commpage
patch_commpage_stuff_routine(kernelData);
//patch_pmCPUExitHaltToOff(kernelData);// Not working as intended, disabled for now
//if(vmware_detected)
{
patch_lapic_init(kernelData);
}
switch(Platform.CPU.Model)
{
// Known good CPU's, no reason to patch kernel
case 13:
case CPUID_MODEL_YONAH:
case CPUID_MODEL_MEROM:
case CPUID_MODEL_PENRYN:
case CPUID_MODEL_NEHALEM:
case CPUID_MODEL_FIELDS:
case CPUID_MODEL_DALES:
case CPUID_MODEL_NEHALEM_EX:
break;
// Known unsuported CPU's
case CPUID_MODEL_ATOM:
// TODO: Impersonate CPU based on user selection
patch_cpuid_set_info(kernelData, CPUFAMILY_INTEL_PENRYN, CPUID_MODEL_PENRYN);// Impersonate Penryn CPU
break;
// Unknown CPU's
default:
// TODO: Impersonate CPU based on user selection
patch_cpuid_set_info(kernelData, 0, 0);// Remove Panic Call
break;
}
}
/**
**This functions located the kernelSymbols[i] symbols in the mach-o header.
**as well as determines the start of the __TEXT segment and __TEXT,__text sections
**/
int locate_symbols(void* kernelData)
{
UInt16 symbolIndexes[NUM_SYMBOLS];
struct load_command *loadCommand;
struct symtab_command *symtableData;
struct nlist *symbolEntry;
char* symbolString;
UInt32 kernelIndex = 0;
kernelIndex += sizeof(struct mach_header);
if(((struct mach_header*)kernelData)->magic != MH_MAGIC) return KERNEL_64;
//printf("%d load commands beginning at 0x%X\n", (unsigned int)header->ncmds, (unsigned int)kernelIndex);
//printf("Commands take up %d bytes\n", header->sizeofcmds);
int cmd = 0;
while(cmd < ((struct mach_header*)kernelData)->ncmds)// TODO: for loop instead
{
cmd++;
loadCommand = kernelData + kernelIndex;
UInt cmdSize = loadCommand->cmdsize;
// Locate start of _panic and _cpuid_set_info in the symbol tabe.
// Load commands should be anded with 0x7FFFFFFF to ignore theLC_REQ_DYLD flag
if((loadCommand->cmd & 0x7FFFFFFF) == LC_SYMTAB)// We only care about the symtab segment
{
//printf("Located symtable, length is 0x%X, 0x%X\n", (unsigned int)loadCommand->cmdsize, (unsigned int)sizeof(symtableData));
symtableData = kernelData + kernelIndex;
kernelIndex += sizeof(struct symtab_command);
cmdSize -= sizeof(struct symtab_command);
// Loop through symbol table untill all of the symbols have been found
symbolString = kernelData + symtableData->stroff;
UInt16 symbolIndex = 0;
UInt8 numSymbolsFound = 0;
while(symbolIndex < symtableData->nsyms && numSymbolsFound < NUM_SYMBOLS)// TODO: for loop
{
int i = 0;
while(i < NUM_SYMBOLS)
{
if(strcmp(symbolString, kernelSymbols[i]) == 0)
{
symbolIndexes[i] = symbolIndex;
numSymbolsFound++;
}
i++;
}
symbolString += strlen(symbolString) + 1;
symbolIndex++;
}
// loop again
symbolIndex = 0;
numSymbolsFound = 0;
while(symbolIndex < symtableData->nsyms && numSymbolsFound < NUM_SYMBOLS)// TODO: for loop
{
symbolEntry = kernelData + symtableData->symoff + (symbolIndex * sizeof(struct nlist));
int i = 0;
while(i < NUM_SYMBOLS)
{
if(symbolIndex == (symbolIndexes[i] - 4))
{
kernelSymbolAddresses[i] = (UInt32)symbolEntry->n_value;
numSymbolsFound++;
}
i++;
}
symbolIndex ++;
}
// Load commands should be anded with 0x7FFFFFFF to ignore theLC_REQ_DYLD flag
} else if((loadCommand->cmd & 0x7FFFFFFF) == LC_SEGMENT)// We only care about the __TEXT segment, any other load command can be ignored
{
struct segment_command *segCommand;
segCommand = kernelData + kernelIndex;
//printf("Segment name is %s\n", segCommand->segname);
if(strcmp("__TEXT", segCommand->segname) == 0)
{
UInt32 sectionIndex;
sectionIndex = sizeof(struct segment_command);
struct section *sect;
while(sectionIndex < segCommand->cmdsize)
{
sect = kernelData + kernelIndex + sectionIndex;
sectionIndex += sizeof(struct section);
if(strcmp("__text", sect->sectname) == 0)
{
// __TEXT,__text found, save the offset and address for when looking for the calls.
textSection = sect->offset;
textAddress = sect->addr;
break;
}
}
}
kernelIndex += cmdSize;
} else {
kernelIndex += cmdSize;
}
}
return KERNEL_32;
}
/**
** Locate the fisrt instance of _panic inside of _cpuid_set_info, and either remove it
** Or replace it so that the cpuid is set to a valid value.
**/
void patch_cpuid_set_info(void* kernelData, UInt32 impersonateFamily, UInt8 impersonateModel)
{
UInt8* bytes = (UInt8*)kernelData;
UInt32 patchLocation = (kernelSymbolAddresses[SYMBOL_CPUID_SET_INFO] - textAddress + textSection);
UInt32 jumpLocation = 0;
UInt32 panicAddr = kernelSymbolAddresses[SYMBOL_PANIC] - textAddress;
if(kernelSymbolAddresses[SYMBOL_CPUID_SET_INFO] == 0)
{
printf("Unable to locate _cpuid_set_info\n");
return;
}
if(kernelSymbolAddresses[SYMBOL_PANIC] == 0)
{
printf("Unable to locate _panic\n");
return;
}
//TODO: don't assume it'll always work (Look for *next* function address in symtab and fail once it's been reached)
while(
(bytes[patchLocation -1] != 0xE8) ||
( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 |
bytes[patchLocation + 1] << 8 |
bytes[patchLocation + 2] << 16 |
bytes[patchLocation + 3] << 24)))
)
{
patchLocation++;
}
patchLocation--;
// Remove panic call, just in case the following patch routines fail
bytes[patchLocation + 0] = 0x90;
bytes[patchLocation + 1] = 0x90;
bytes[patchLocation + 2] = 0x90;
bytes[patchLocation + 3] = 0x90;
bytes[patchLocation + 4] = 0x90;
// Locate the jump call, so that 10 bytes can be reclamed.
// NOTE: This will *NOT* be located on pre 10.6.2 kernels
jumpLocation = patchLocation - 15;
while((bytes[jumpLocation - 1] != 0x77 ||
bytes[jumpLocation] != (patchLocation - jumpLocation - -8)) &&
(patchLocation - jumpLocation) < 0xF0)
{
jumpLocation--;
}
// If found... AND we want to impersonate a specific cpumodel / family...
if(impersonateFamily &&
impersonateModel &&
((patchLocation - jumpLocation) < 0xF0))
{
bytes[jumpLocation] -= 10;// sizeof(movl$0x6b5a4cd2,0x00872eb4) = 10bytes
/*
* Inpersonate the specified CPU FAMILY and CPU Model
*/
// bytes[patchLocation - 17] = 0xC7;// already here... not needed to be done
// bytes[patchLocation - 16] = 0x05;// see above
UInt32 cpuid_cpufamily_addr =bytes[patchLocation - 15] << 0 |
bytes[patchLocation - 14] << 8 |
bytes[patchLocation - 13] << 16 |
bytes[patchLocation - 12] << 24;
// NOTE: may change, determined based on cpuid_info struct
UInt32 cpuid_model_addr = cpuid_cpufamily_addr - 299;
// cpufamily = CPUFAMILY_INTEL_PENRYN
bytes[patchLocation - 11] = (impersonateFamily & 0x000000FF) >> 0;
bytes[patchLocation - 10] = (impersonateFamily & 0x0000FF00) >> 8;
bytes[patchLocation - 9] = (impersonateFamily & 0x00FF0000) >> 16;
bytes[patchLocation - 8] = (impersonateFamily & 0xFF000000) >> 24;
// NOPS, just in case if the jmp call wasn't patched, we'll jump to a
// nop and continue with the rest of the patch
// Yay two free bytes :), 10 more can be reclamed if needed, as well as a few
// from the above code (only cpuid_model needs to be set.
bytes[patchLocation - 7] = 0x90;
bytes[patchLocation - 6] = 0x90;
bytes[patchLocation - 5] = 0xC7;
bytes[patchLocation - 4] = 0x05;
bytes[patchLocation - 3] = (cpuid_model_addr & 0x000000FF) >> 0;
bytes[patchLocation - 2] = (cpuid_model_addr & 0x0000FF00) >> 8;
bytes[patchLocation - 1] = (cpuid_model_addr & 0x00FF0000) >> 16;
bytes[patchLocation - 0] = (cpuid_model_addr & 0xFF000000) >> 24;
// Note: I could have just copied the 8bit cpuid_model in and saved about 4 bytes
// so if this function need a different patch it's still possible. Also, about ten bytes previous can be freed.
bytes[patchLocation + 1] = impersonateModel;// cpuid_model
bytes[patchLocation + 2] = 0x01;// cpuid_extmodel
bytes[patchLocation + 3] = 0x00;// cpuid_extfamily
bytes[patchLocation + 4] = 0x02;// cpuid_stepping
}
else if(impersonateFamily && impersonateModel)
{
// pre 10.6.2 kernel
// Locate the jump to directly *after* the panic call,
jumpLocation = patchLocation - 4;
while((bytes[jumpLocation - 1] != 0x77 ||
bytes[jumpLocation] != (patchLocation - jumpLocation + 4)) &&
(patchLocation - jumpLocation) < 0x20)
{
jumpLocation--;
}
// NOTE above isn't needed (I was going to use it, but I'm not, so instead,
// I'll just leave it to verify the binary stucture.
// NOTE: the cpumodel_familt data is not set in _cpuid_set_info
// so we don't need to set it here, I'll get set later based on the model
// we set now.
if((patchLocation - jumpLocation) < 0x20)
{
UInt32 cpuid_model_addr =(bytes[patchLocation - 14] << 0 |
bytes[patchLocation - 13] << 8 |
bytes[patchLocation - 12] << 16 |
bytes[patchLocation - 11] << 24);
// Remove jump
bytes[patchLocation - 9] = 0x90;/// Was a jump if supported cpu
bytes[patchLocation - 8] = 0x90;// jumped past the panic call, we want to override the panic
bytes[patchLocation - 7] = 0x90;
bytes[patchLocation - 6] = 0x90;
bytes[patchLocation - 5] = 0xC7;
bytes[patchLocation - 4] = 0x05;
bytes[patchLocation - 3] = (cpuid_model_addr & 0x000000FF) >> 0;
bytes[patchLocation - 2] = (cpuid_model_addr & 0x0000FF00) >> 8;
bytes[patchLocation - 1] = (cpuid_model_addr & 0x00FF0000) >> 16;
bytes[patchLocation - 0] = (cpuid_model_addr & 0xFF000000) >> 24;
// Note: I could have just copied the 8bit cpuid_model in and saved about 4 bytes
// so if this function need a different patch it's still possible. Also, about ten bytes previous can be freed.
bytes[patchLocation + 1] = impersonateModel;// cpuid_model
bytes[patchLocation + 2] = 0x01;// cpuid_extmodel
bytes[patchLocation + 3] = 0x00;// cpuid_extfamily
bytes[patchLocation + 4] = 0x02;// cpuid_stepping
patchLocation = jumpLocation;
// We now have 14 bytes available for a patch
}
else
{
// Patching failed, using NOP replacement done initialy
}
}
else
{
// Either We were unable to change the jump call due to the function's sctructure
// changing, or the user did not request a patch. As such, resort to just
// removing the panic call (using NOP replacement above). Note that the
// IntelCPUPM kext may still panic due to the cpu's Model ID not being patched
}
}
/**
** SleepEnabler.kext replacement (for those that need it)
** Located the KERN_INVALID_ARGUMENT return and replace it with KERN_SUCCESS
**/
void patch_pmCPUExitHaltToOff(void* kernelData)
{
UInt8* bytes = (UInt8*)kernelData;
UInt32 patchLocation = (kernelSymbolAddresses[SYMBOL_PMCPUEXITHALTTOOFF] - textAddress + textSection);
if(kernelSymbolAddresses[SYMBOL_PMCPUEXITHALTTOOFF] == 0)
{
printf("Unable to locate _pmCPUExitHaltToOff\n");
return;
}
while(bytes[patchLocation - 1]!= 0xB8 ||
bytes[patchLocation]!= 0x04 ||// KERN_INVALID_ARGUMENT (0x00000004)
bytes[patchLocation + 1]!= 0x00 ||// KERN_INVALID_ARGUMENT
bytes[patchLocation + 2]!= 0x00 ||// KERN_INVALID_ARGUMENT
bytes[patchLocation + 3]!= 0x00)// KERN_INVALID_ARGUMENT
{
patchLocation++;
}
bytes[patchLocation] = 0x00;// KERN_SUCCESS;
}
void patch_lapic_init(void* kernelData)
{
UInt8 panicIndex = 0;
UInt8* bytes = (UInt8*)kernelData;
UInt32 patchLocation = (kernelSymbolAddresses[SYMBOL_LAPIC_INIT] - textAddress + textSection);
UInt32 panicAddr = kernelSymbolAddresses[SYMBOL_PANIC] - textAddress;
if(kernelSymbolAddresses[SYMBOL_LAPIC_INIT] == 0)
{
printf("Unable to locate %s\n", SYMBOL_LAPIC_INIT_STRING);
return;
}
if(kernelSymbolAddresses[SYMBOL_PANIC] == 0)
{
printf("Unable to locate %s\n", SYMBOL_PANIC_STRING);
return;
}
// Locate the (panicIndex + 1) panic call
while(panicIndex < 3)// Find the third panic call
{
while(
(bytes[patchLocation -1] != 0xE8) ||
( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 |
bytes[patchLocation + 1] << 8 |
bytes[patchLocation + 2] << 16 |
bytes[patchLocation + 3] << 24)))
)
{
patchLocation++;
}
patchLocation++;
panicIndex++;
}
patchLocation--;// Remove extra increment from the < 3 while loop
bytes[--patchLocation] = 0x90;
bytes[++patchLocation] = 0x90;
bytes[++patchLocation] = 0x90;
bytes[++patchLocation] = 0x90;
bytes[++patchLocation] = 0x90;
}
void patch_commpage_stuff_routine(void* kernelData)
{
UInt8* bytes = (UInt8*)kernelData;
UInt32 patchLocation = (kernelSymbolAddresses[SYMBOL_COMMPAGE_STUFF_ROUTINE] - textAddress + textSection);
UInt32 panicAddr = kernelSymbolAddresses[SYMBOL_PANIC] - textAddress;
if(kernelSymbolAddresses[SYMBOL_COMMPAGE_STUFF_ROUTINE] == 0)
{
printf("Unable to locate %s\n", SYMBOL_COMMPAGE_STUFF_ROUTINE_STRING);
return;
}
if(kernelSymbolAddresses[SYMBOL_PANIC] == 0)
{
printf("Unable to locate %s\n", SYMBOL_PANIC_STRING);
return;
}
while(
(bytes[patchLocation -1] != 0xE8) ||
( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 |
bytes[patchLocation + 1] << 8 |
bytes[patchLocation + 2] << 16 |
bytes[patchLocation + 3] << 24)))
)
{
patchLocation++;
}
patchLocation--;
// Remove panic call, just in case the following patch routines fail
bytes[patchLocation + 0] = 0x90;
bytes[patchLocation + 1] = 0x90;
bytes[patchLocation + 2] = 0x90;
bytes[patchLocation + 3] = 0x90;
bytes[patchLocation + 4] = 0x90;
}
branches/meklort/i386/boot2/kernel_patcher.h
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/*
* Copyright (c) 2009 Evan Lojewski. All rights reserved.
*
*/
#include <mach-o/loader.h>
#include <mach-o/nlist.h>
#ifndef __BOOT2_KERNEL_PATCHER_H
#define __BOOT2_KERNEL_PATCHER_H
#define CPUID_MODEL_YONAH14
#define CPUID_MODEL_MEROM15
#define CPUID_MODEL_PENRYN23
#define CPUID_MODEL_NEHALEM26
#define CPUID_MODEL_ATOM28
#define CPUID_MODEL_FIELDS30/* Lynnfield, Clarksfield, Jasper */
#define CPUID_MODEL_DALES31/* Havendale, Auburndale */
#define CPUID_MODEL_NEHALEM_EX46
void patch_kernel(void* kernelData);
#define KERNEL_641
#define KERNEL_322
int locate_symbols(void* kernelData);
void patch_kernel_32(void* kernelData);
void patch_kernel_64(void* kernelData);
void patch_cpuid_set_info(void* kernelData, UInt32 impersonateFamily, UInt8 inpersonateModel);
void patch_pmCPUExitHaltToOff(void* kernelData);
void patch_lapic_init(void* kernelData);
void patch_commpage_stuff_routine(void* kernelData);
#endif /* !__BOOT2_KERNEL_PATCHER_H */

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