Re: [PATCH] console_codes(4): Add ESC [ 3 J

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On Wed, Sep 14, 2011 at 08:51:51AM +0200, Michael Kerrisk wrote:
> 
> 2011/4/22 Petr Písař <ppisar@xxxxxxxxxx>:
> > Linux is going
> > (http://git.kernel.org/?p=linux/kernel/git/next/linux-next.git;a=commit;h=f8df13e0a901fe55631fed66562369b4dba40f8b)
> > to implement \E[3J to allow scrambling content of console including
> > scroll-back buffer (http://thread.gmane.org/gmane.linux.kernel/1125792).
> 
> In which kernel version was this patch applied?
> 
3.0.

-- Petr

> > This is useful at terminal lock to disallow attacker to scroll visible
> > window back and to see sensitive data. Other \E[J sequences do not
> > blank history. Terminal reset (\Ec) or DECSRC are not suitable for
> > extension too beacuse they reset font, keyboard locks, unicode mode
> > etc. that are needed after unlocking session.
> >
> > \E[3J is superset of \E[2J. IOW it clears visible screen too.
> >
> > Signed-off-by: Petr Písař <ppisar@xxxxxxxxxx>
> > ---
> >  man4/console_codes.4 |    2 ++
> >  1 files changed, 2 insertions(+), 0 deletions(-)
> >
> > diff --git a/man4/console_codes.4 b/man4/console_codes.4
> > index 2a806b7..62f2247 100644
> > --- a/man4/console_codes.4
> > +++ b/man4/console_codes.4
> > @@ -188,6 +188,8 @@ H   CUP     Move cursor to the indicated row, column (origin at 1,1).
> >  J      ED      Erase display (default: from cursor to end of display).
> >                ESC [ 1 J: erase from start to cursor.
> >                ESC [ 2 J: erase whole display.
> > +               ESC [ 3 J: erase whole display including scroll-back
> > +               buffer.
> >  K      EL      Erase line (default: from cursor to end of line).
> >                ESC [ 1 K: erase from start of line to cursor.
> >                ESC [ 2 K: erase whole line.
> > --
> > 1.7.4.4
> >
> >

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