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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