From da70596895d8135e08f8caac6978117697b4c021 Mon Sep 17 00:00:00 2001
From: Amlal El Mahrouss <amlal.elmahrouss@icloud.com>
Date: Sun, 18 Aug 2024 21:39:29 +0200
Subject: [REFACTOR]

Improved project structure.

Signed-off-by: Amlal El Mahrouss <amlal.elmahrouss@icloud.com>
---
 dev/ZKA/Sources/ThreadLocalStorage.cxx | 76 ++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 dev/ZKA/Sources/ThreadLocalStorage.cxx

(limited to 'dev/ZKA/Sources/ThreadLocalStorage.cxx')

diff --git a/dev/ZKA/Sources/ThreadLocalStorage.cxx b/dev/ZKA/Sources/ThreadLocalStorage.cxx
new file mode 100644
index 00000000..f258fa11
--- /dev/null
+++ b/dev/ZKA/Sources/ThreadLocalStorage.cxx
@@ -0,0 +1,76 @@
+/*
+ * ========================================================
+ *
+ * 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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