CONFIG_MODIFY_LDT_SYSCALL: Enable the LDT (local descriptor table)

General informations

The Linux kernel configuration item CONFIG_MODIFY_LDT_SYSCALL:

• prompt: Enable the LDT (local descriptor table)
• type: bool
• depends on: CONFIG_EXPERT
• defined in arch/x86/Kconfig
• found in Linux kernels: 4.3–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

Linux can allow user programs to install a per-process x86 Local Descriptor Table (LDT) using the modify_ldt(2) system call. This is required to run 16-bit or segmented code such as DOSEMU or some Wine programs. It is also used by some very old threading libraries.

Enabling this feature adds a small amount of overhead to context switches and increases the low-level kernel attack surface. Disabling it removes the modify_ldt(2) system call.

Saying 'N' here may make sense for embedded or server kernels.

Hardware

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Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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