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/*
* ========================================================
*
* Kernel
* Copyright ZKA Technologies., all rights reserved.
*
* ========================================================
*/
#include <NewKit/String.hxx>
#include <CFKit/Property.hxx>
#include <KernelKit/ProcessScheduler.hxx>
#include <KernelKit/ThreadLocalStorage.hxx>
///! BUGS: 0
/***********************************************************************************/
/// @file ThreadLocalStorage.cxx
/// @brief TLS inside the kernel.
/***********************************************************************************/
using namespace Kernel;
Kernel::Property cTLSEnforceCheck;
/**
* @brief Checks for cookie inside the TIB.
* @param tib the TIB to check.
* @return if the cookie is enabled.
*/
Boolean tls_check_tib(THREAD_INFORMATION_BLOCK* the_tib)
{
if (!the_tib)
return false;
Encoder encoder;
const char* tibAsBytes = encoder.AsBytes(the_tib);
kcout << "newoskrnl: checking for a valid cookie inside the TIB...\r";
return tibAsBytes[0] == kCookieMag0 && tibAsBytes[1] == kCookieMag1 &&
tibAsBytes[2] == kCookieMag2;
}
/**
* @brief System call implementation of the TLS check.
* @param stackPtr The call frame.
* @return
*/
EXTERN_C Bool tls_check_syscall_impl(Kernel::VoidPtr tib_ptr) noexcept
{
if (!tib_ptr)
{
if (cTLSEnforceCheck.GetValue() == No)
{
return true;
}
else
{
kcout << "newoskrnl: failing because of an invalid TIB...\r";
return false;
}
}
THREAD_INFORMATION_BLOCK* tib_struct = (THREAD_INFORMATION_BLOCK*)tib_ptr;
if (!tls_check_tib(tib_struct))
{
kcout << "newoskrnl: crashing because of an invalid TIB...\r";
return false;
}
kcout << "newoskrnl: Verification succeeded! staying alive...\r";
return true;
}
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