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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.

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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