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The SSDT maps syscalls to kernel function addresses. When a syscall is issued by a user space application, it contains the service index as parameter to indicate which syscall is called. The SSDT is then used to resolve the address of the corresponding function within ntoskrnl.exe. In modern Windows kernels, two SSDTs are used: One for generic ...
Service Description Table. Service Description Table (SDT) is a metadata table used in Digital Video Broadcasting systems to describe the television, radio or other services contained in MPEG transport streams provided by the system. The purpose and format of the table is defined in ETSI EN 300 468: Specification for Service Information (SI) in ...
Computing. System Service Descriptor Table, an internal data structure within Microsoft Windows. Secondary System Description Table, an ACPI table. SQL Server Data Tools, the IDE for working with Microsoft SQL Server 2012 databases and associated objects.
Global Descriptor Table. The Global Descriptor Table (GDT) is a data structure used by Intel x86 -family processors starting with the 80286 in order to define the characteristics of the various memory areas used during program execution, including the base address, the size, and access privileges like executability and writability.
The port numbers in the range from 0 to 1023 (0 to 2 10 − 1) are the well-known ports or system ports. [3] They are used by system processes that provide widely used types of network services. On Unix-like operating systems, a process must execute with superuser privileges to be able to bind a network socket to an IP address using one of the ...
If a modification is detected, then Windows will initiate a bug check and shut down the system, [6] [8] with a blue screen and/or reboot. The corresponding bugcheck number is 0x109, the bugcheck code is CRITICAL_STRUCTURE_CORRUPTION. Prohibited modifications include: [8] Modifying system service descriptor tables; Modifying the interrupt ...
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Protected mode may only be entered after the system software sets up one descriptor table and enables the Protection Enable (PE) bit in the control register 0 (CR0). [ 5 ] Protected mode was first added to the x86 architecture in 1982, [ 6 ] with the release of Intel 's 80286 (286) processor, and later extended with the release of the 80386 ...