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/*
* ========================================================
*
* minoskrnl
* Copyright (C) 2024, ELMH Group, all rights reserved., all rights reserved.
*
* ========================================================
*/
#include <NewKit/KString.h>
#include <CFKit/Property.h>
#include <KernelKit/UserProcessScheduler.h>
#include <KernelKit/ThreadLocalStorage.h>
/***********************************************************************************/
/// @bugs: 0
/// @file ThreadLocalStorage.cc
/// @brief Process Thread Local Storage.
/***********************************************************************************/
using namespace Kernel;
/**
* @brief Checks for cookie inside the TIB.
* @param tib_ptr the TIB to check.
* @return if the cookie is enabled, true; false otherwise
*/
Boolean tls_check_tib(THREAD_INFORMATION_BLOCK* tib_ptr)
{
if (!tib_ptr ||
!tib_ptr->Record)
return false;
IEncoderObject encoder;
const char* tib_as_bytes = encoder.AsBytes(tib_ptr);
kcout << "Checking for a valid cookie inside the TIB...\r";
return tib_as_bytes[0] == kCookieMag0 && tib_as_bytes[1] == kCookieMag1 &&
tib_as_bytes[2] == kCookieMag2;
}
/**
* @brief System call implementation of the TLS check.
* @param tib_ptr The TIB record.
* @return
*/
EXTERN_C Bool tls_check_syscall_impl(Kernel::VoidPtr tib_ptr) noexcept
{
if (!tib_ptr)
{
kcout << "Failing because of an invalid TIB...\r";
return false;
}
THREAD_INFORMATION_BLOCK* tib = (THREAD_INFORMATION_BLOCK*)tib_ptr;
if (!tls_check_tib(tib))
{
kcout << "Crashing because of an invalid TIB...\r";
return false;
}
kcout << "Verification succeeded! staying alive...\r";
return true;
}
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