Hi,
I'm a bit confused about the fact that everyone who has access to a virtual
console can stop the keyboard from working by using the KDSKBMODE ioctl:
ioctl(fd_to_console_or_tty, KDSKBMODE, K_RAW);
This is a problem because console switching via alt+fx is no longer possible
when the keyboard is in raw mode.
Why is everyone permitted to change the keyboard mode? I guess it is because
of the unicode support, but couldn't a modified unicode_start script be
called by root while running some init script?
The loadkeys (KDSKBENT) and setkeycodes (KDSETKEYCODE) programs fail because
of permisson problems when they are called by a non-privileged user. I
think that's correct, but an unprivileged user should not be able to make
the system unusable by using KDSKBMODE.
Stefan
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