Messages in this thread | | | From | Stefan Gast <> | Subject | Shouldn't the ioctl KDSKBMODE only be usable by root? | Date | Fri, 28 Apr 2006 13:41:27 +0200 |
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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.
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