From d48cbe75ef29a9c67c9d176bf58e56ea6448fb9e Mon Sep 17 00:00:00 2001
From: Amlal El Mahrouss <amlal.elmahrouss@icloud.com>
Date: Mon, 21 Oct 2024 20:23:36 +0200
Subject: IMP: Major refactor of header and source files extensions.

Signed-off-by: Amlal El Mahrouss <amlal.elmahrouss@icloud.com>
---
 dev/zka/src/ThreadLocalStorage.cc | 67 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 dev/zka/src/ThreadLocalStorage.cc

(limited to 'dev/zka/src/ThreadLocalStorage.cc')

diff --git a/dev/zka/src/ThreadLocalStorage.cc b/dev/zka/src/ThreadLocalStorage.cc
new file mode 100644
index 00000000..ef8aba6c
--- /dev/null
+++ b/dev/zka/src/ThreadLocalStorage.cc
@@ -0,0 +1,67 @@
+/*
+ * ========================================================
+ *
+ * minoskrnl
+ * Copyright ZKA Web Services Co., all rights reserved.
+ *
+ *  ========================================================
+ */
+
+#include <NewKit/String.h>
+#include <CFKit/Property.h>
+#include <KernelKit/UserProcessScheduler.h>
+#include <KernelKit/ThreadLocalStorage.h>
+
+/***********************************************************************************/
+/// @bugs: 0
+/// @file ThreadLocalStorage.cxx
+/// @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->f_ThreadRecord)
+		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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