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CONFIG_X86_VSYSCALL_EMULATION: Enable vsyscall emulation

General informations

The Linux kernel configuration item CONFIG_X86_VSYSCALL_EMULATION:

Help text

This enables emulation of the legacy vsyscall page. Disabling it is roughly equivalent to booting with vsyscall=none, except that it will also disable the helpful warning if a program tries to use a vsyscall. With this option set to N, offending programs will just segfault, citing addresses of the form 0xffffffffff600?00.

This option is required by many programs built before 2013, and care should be used even with newer programs if set to N.

Disabling this option saves about 7K of kernel size and possibly 4K of additional runtime pagetable memory.



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