Re: [PATCH] console: Add persistent scrollback buffers for all VGA consoles

On Sa, 2014-05-31 at 00:26 +0200, Jakub Wilk wrote:

* Manuel Schölling [off-list ref], 2014-05-30, 15:27:

quoted

Add a scrollback buffers for each VGA console. The benefit is that the 
scrollback history is not flushed when switching between consoles but 
is persistent.

Some people rely on this scrollback flushing as a security feature. Is 
there even another way to clear the scrollback, than to switch to 
another vt and then back again?

Thanks for raising this security issue! Maybe we should add something
like VT_FLUSH_SCROLLBACK to vt_ioctl()? [1]
I'm open for better ways to flush the scrollback history.

[1] http://lxr.free-electrons.com/source/drivers/tty/vt/vt_ioctl.c#L334

Debian ships this:
http://manpages.debian.org/cgi-bin/man.cgi?query=clear_console
https://sources.debian.net/src/bash/4.2%2Bdfsg-0.1/debian/clear_console.c