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Re: Bug#644788: Bug#654116: RFH: screen -- terminal multiplexor with VT100/ANSI terminal emulation

On Tue, Jan 03, 2012 at 07:17:04AM +0100, Axel Beckert wrote:
> Hi Yaroslav!
> Yaroslav Halchenko wrote:
> > > > I strongly recommend this solution, along with a proper debconf notice.
> > > [...]
> > > > /tmp is a good choice because the next reboot will automatically clean 
> > > > up everything (and obviously the old binary will not be needed after 
> > > > a reboot).
> > > Thanks for that hint. This sounds better (and especially less messy)
> > > than I thought! :-)
> > 
> > Thank you Axel for your detailed response and IMHO this is indeed close
> > to an ideal (lightweight, self-cleaning, etc) resolution for this
> > scenario.  BTW -- what is the take of standards/practices on having /tmp
> > mounted with noexec [1]?
> Good point! /run/shm (IIRC formerly /dev/shm) likely would be an
> alternative option, too.

No, it would not.  This directory is reserved for the eglibc
POSIX SHM/SEM interfaces.  Please don't abuse it--we only just
moved all the existing abusers to /run!  Nothing other than
eglibc has any business creating files there, ever.

If you really need to use a filesystem mounted noexec, just run
the binary via /lib/ld.so (you'll need to get the real location
from e.g. ldd).  Something like:

  LD=$(ldd /tmp/path/to/screen | grep "ld-${arch}" | sed -e 's/[[:space:]]*\(\/[^[:space:]]*\)[[:space:]].*/\1/')
  "$LD" /tmp/screen-94skls/screen

Or query for DT_INTERP directly and run that.


  .''`.  Roger Leigh
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