Re: permissions of /proc/tty/driver

[Arjan van de Ven <arjan@xxxxxxxxxxxxx>]

On Sun, 2005-01-16 at 23:26 +0100, Christoph Hellwig wrote:
> On Sun, Jan 16, 2005 at 09:11:03PM +0000, Alan Cox wrote:
> > On Sul, 2005-01-16 at 12:04, Christoph Hellwig wrote:
> > > > (where /proc/tty/driver/serial is mentioned as leaking sensitive 
> > > > information), to me the contents of usbserial look innocent enough.
> > > > Do you have any hints on what might be a good solution?
> > > 
> > > The permissions on the directory look indeed too strict to me.  It might
> > > be better to just use strict permissions on /proc/tty/driver/serial
> > > indeed.
> > 
> > The file containts transmit and receive byte counts, which means you can
> > both measure intercharacter delay and character count. Thats a big help
> > to password guessers
> 
> I know.  But that doesn't explain why we don't keep strict permissions
> only on that file but on the directory.

ls -la on the file gives you the size maybe ?



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