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The Linux kernel configuration item CONFIG_LEGACY_TIOCSTI:

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Historically the kernel has allowed TIOCSTI, which will push characters into a controlling TTY. This continues to be used as a malicious privilege escalation mechanism, and provides no meaningful real-world utility any more. Its use is considered a dangerous legacy operation, and can be disabled on most systems.

Say Y here only if you have confirmed that your system's userspace depends on this functionality to continue operating normally.

Processes which run with CAP_SYS_ADMIN, such as BRLTTY, can use TIOCSTI even when this is set to N.

This functionality can be changed at runtime with the dev.tty.legacy_tiocsti sysctl. This configuration option sets the default value of the sysctl.



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