Security Issues
To preserve system security, the Global Descriptor Table should be held in protected memory, otherwise any program will be able to create its own call gate and use it to raise its privilege level. Call gates have sometimes been used as a vector for software security exploits, when ways have been found around this protection. One example of this is the E-mail worm Gurong.A written to exploit the Microsoft Windows operating system, which uses \Device\PhysicalMemory to install a call gate.
Read more about this topic: Call Gate
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