BugTraq
gnome-terminal, xfce4-terminal, terminator and others write scrollback buffer to disk Mar 06 2012 08:47PM
Mark Krenz (mark suso com) (1 replies)
Re: gnome-terminal, xfce4-terminal, terminator and others write scrollback buffer to disk Mar 09 2012 12:57AM
Dmitry Yu. Bolkhovityanov (D Yu Bolkhovityanov inp nsk su)
On Tue, 6 Mar 2012, Mark Krenz wrote:

> Testing and reproducing the issue:
> -----------------------------------------------------------------------
> On Linux, if you want to see this behavior, you can do the following:
>
> 1. Open one of the affected terminal emulators.
> 2. Make sure its scrollback buffer is set to something like 500 or
> more so that it saves some of the scrollback.
> 3. In the terminal, run:
> ls -l /proc/$PPID/fd | grep deleted
> If enough data has entered the scrollback buffer, you should start
> to see unlinked (deleted) files called /tmp/vte.*
>
> To see the data that has been logged to /tmp, you use a command like
> strings to view the contents of your /tmp partition. If you have a
> seperate /tmp partition and its located on /dev/sda2, this could be done
> like this:
>
> strings /dev/sda2 | less

While the affected terminal is still running, it is much easier to
directly read /proc/PID/fd/NNN files.

So, I suspect it can even be possible to see a "live mirror" of a
running terminal session (yes, that is possible anyway via ptrace() or
/proc/FD/mem, but reading well-known-formatted files is much-much-much
easier).

_________________________________________
Dmitry Yu. Bolkhovityanov
The Budker Institute of Nuclear Physics
Novosibirsk, Russia

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