I just opened a discussion on the upstream util-linux list:
http://marc.info/?t=145694748900001&r=1&w=2

Discussion there proposes to fix it in the kernel:

Disallow the use of TIOCSTI to unprivileged users unless the caller has CAP_SYS_ADMIN.

--
Best Regards / S pozdravem,

Stanislav Brabec
software developer
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