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kern_dbgenhancer.cpp
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kern_dbgenhancer.cpp
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//
// kern_dbgenhancer.cpp
// DebugEnhancer
//
// Copyright © 2019 lvs1974. All rights reserved.
//
#include <Headers/kern_api.hpp>
#include <Headers/kern_util.hpp>
#include "kern_dbgenhancer.hpp"
#include "osx_defines.h"
static DBGENH *callbackDBGENH = nullptr;
bool DBGENH::init()
{
callbackDBGENH = this;
lilu.onPatcherLoadForce(
[](void *user, KernelPatcher &patcher) {
callbackDBGENH->processKernel(patcher);
}, this);
return true;
}
void DBGENH::deinit()
{
}
//==============================================================================
int DBGENH::kdb_printf(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
callbackDBGENH->kern_vprintf(fmt, ap);
va_end(ap);
return 0;
}
//==============================================================================
void DBGENH::kprintf(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
callbackDBGENH->kern_vprintf(fmt, ap);
va_end(ap);
}
//==============================================================================
IOReturn DBGENH::IOHibernateSystemSleep(void)
{
unsigned int value = 0;
if (callbackDBGENH->kernel_debug_entry_count) {
value = *callbackDBGENH->kernel_debug_entry_count;
*callbackDBGENH->kernel_debug_entry_count = 1;
}
IOReturn result = FunctionCast(IOHibernateSystemSleep, callbackDBGENH->orgIOHibernateSystemSleep)();
SYSLOG("DBGENH", "IOHibernateSystemSleep is called, result is: %x", result);
if (callbackDBGENH->kernel_debug_entry_count)
*callbackDBGENH->kernel_debug_entry_count = value;
return result;
}
//==============================================================================
uint32_t DBGENH::hibernate_write_image(void)
{
unsigned int value = 0;
if (callbackDBGENH->kernel_debug_entry_count) {
value = *callbackDBGENH->kernel_debug_entry_count;
*callbackDBGENH->kernel_debug_entry_count = 1;
}
printf("DBGENH @ hibernate_write_image is called\n");
uint32_t result = FunctionCast(hibernate_write_image, callbackDBGENH->org_hibernate_write_image)();
printf("DBGENH @ hibernate_write_image result is: %x\n", result);
if (callbackDBGENH->kernel_debug_entry_count)
*callbackDBGENH->kernel_debug_entry_count = value;
return result;
}
//==============================================================================
void DBGENH::processKernel(KernelPatcher &patcher)
{
if (!(progressState & ProcessingState::KernelRouted))
{
kernel_debug_entry_count = reinterpret_cast<unsigned int *>(patcher.solveSymbol(KernelPatcher::KernelID, "_kernel_debugger_entry_count"));
if (!kernel_debug_entry_count)
SYSLOG("DBGENH", "Symbol _kernel_debugger_entry_count cannot be resolved with error %d", patcher.getError());
patcher.clearError();
gIOKitDebug = reinterpret_cast<SInt64*>(patcher.solveSymbol(KernelPatcher::KernelID, "_gIOKitDebug"));
if (gIOKitDebug) {
*gIOKitDebug |= kIOLogPMRootDomain | kIOLogHibernate;
}
else
SYSLOG("DBGENH", "Symbol _gIOKitDebug cannot be resolved with error %d", patcher.getError());
patcher.clearError();
kern_vprintf = reinterpret_cast<t_kern_vprintf>(patcher.solveSymbol(KernelPatcher::KernelID, "_vprintf"));
if (kern_vprintf) {
KernelPatcher::RouteRequest requests[] = {
{"_kdb_printf", kdb_printf},
{"_kprintf", kprintf},
{"_hibernate_write_image", hibernate_write_image, org_hibernate_write_image},
{"_IOHibernateSystemSleep", IOHibernateSystemSleep, orgIOHibernateSystemSleep}
};
if (!patcher.routeMultiple(KernelPatcher::KernelID, requests, arrsize(requests)))
SYSLOG("DBGENH", "patcher.routeMultiple for %s is failed with error %d", requests[0].symbol, patcher.getError());
} else
SYSLOG("DBGENH", "Symbol _vprintf cannot be resolved with error %d", patcher.getError());
log_setsize = reinterpret_cast<t_log_setsize>(patcher.solveSymbol(KernelPatcher::KernelID, "_log_setsize"));
if (log_setsize) {
int size = 1048576;
const uint8_t find[] = {0x3D, 0xFF, 0xFF, 0x0F, 0x00, 0x0F};
const uint8_t replace[] = {0x3D, 0xFF, 0xFF, 0xFF, 0xFF, 0x0F};
KernelPatcher::LookupPatch patch = {nullptr, find, replace, sizeof(find), 1};
DBGLOG("DBGENH", "applying kernel patch");
patcher.clearError();
patcher.applyLookupPatch(&patch, reinterpret_cast<uint8_t *>(log_setsize), 50);
if (patcher.getError() == KernelPatcher::Error::NoError)
size = 10485760;
else
SYSLOG("DBGENH", "applyLookupPatch failed with error %d", patcher.getError());
int error = 0;
if ((error = log_setsize(size)))
SYSLOG("DBGENH", "log_setsize could not change dmesg buffer size to %d, error: %d", size, error);
}
else
SYSLOG("DBGENH", "Symbol _log_setsize cannot be resolved with error %d", patcher.getError());
progressState |= ProcessingState::KernelRouted;
}
// Ignore all the errors for other processors
patcher.clearError();
}