void KernelPatcher::setupKextListening() {
// We have already done this
if (that) return;
loadedKextSummaries = reinterpret_cast<OSKextLoadedKextSummaryHeader **>(solveSymbol(KernelID, "_gLoadedKextSummaries"));
if (loadedKextSummaries) {
DBGLOG("patcher @ _gLoadedKextSummaries address %p", loadedKextSummaries);
} else {
code = Error::NoSymbolFound;
return;
}
bool hookOuter = getKernelVersion() >= KernelVersion::Sierra;
mach_vm_address_t s = solveSymbol(KernelID, hookOuter ?
"__ZN6OSKext25updateLoadedKextSummariesEv" :
"_OSKextLoadedKextSummariesUpdated");
if (s) {
DBGLOG("patcher @ kext summaries (%d) address %llX value %llX", hookOuter, s, *reinterpret_cast<uint64_t *>(s));
} else {
code = Error::NoSymbolFound;
return;
}
if (hookOuter) {
orgUpdateLoadedKextSummaries = reinterpret_cast<void(*)(void)>(
routeFunction(s, reinterpret_cast<mach_vm_address_t>(onKextSummariesUpdated), true, true)
);
} else {
routeFunction(s, reinterpret_cast<mach_vm_address_t>(onKextSummariesUpdated));
}
if (getError() == Error::NoError) {
// Allow static functions to access the patcher body
that = this;
}
}
inline T solveSymbol(size_t id, const char *symbol, mach_vm_address_t start, size_t size, bool crash=false) {
auto addr = solveSymbol(id, symbol);
if (addr) {
if (addr >= start && addr < start + size)
return (T)addr;
code = Error::InvalidSymbolFound;
SYSTRACE("patcher", "address " PRIKADDR " is out of range " PRIKADDR " with size %lX",
CASTKADDR(addr), CASTKADDR(start), size);
PANIC_COND(crash, "patcher", "address " PRIKADDR " is out of range " PRIKADDR " with size %lX",
CASTKADDR(addr), CASTKADDR(start), size);
}
return (T)nullptr;
}
