linux-kernel - Re: [PATCH] proc: add "personality" to process status file

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Date:	Sun, 5 Oct 2008 03:07:01 -0700
From:	Kees Cook <kees.cook@...onical.com>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] proc: add "personality" to process status file

On Sun, Oct 05, 2008 at 01:11:20PM +0400, Alexey Dobriyan wrote:
> On Sat, Oct 04, 2008 at 05:48:43PM -0700, Arjan van de Ven wrote:
> > On Sat, 4 Oct 2008 17:42:33 -0700
> > Kees Cook <kees.cook@...onical.com> wrote:
> > 
> > > On Sat, Oct 04, 2008 at 04:42:39PM -0700, Arjan van de Ven wrote:
> > > > On Sat, 4 Oct 2008 15:02:20 -0700
> > > > Kees Cook <kees.cook@...onical.com> wrote:
> > > > > Nothing else seemed appropriate, but I could make a brand new proc
> > > > > file, if that's sensible.  "status_private" ?
> > > > 
> > > > how about a file called "personality" that has each set bit as an
> > > > ascii version ?
> > > > (one per line maybe)
> > > 
> > > Well, it's a one-to-many due to how the personality types are defined,
> > > so doing a bitfield-to-ASCII-names conversion wouldn't really work
> > > out:
> > > 
> > >         PER_SCOSVR3 =           0x0003 | STICKY_TIMEOUTS |
> > >                                          WHOLE_SECONDS | SHORT_INODE,
> > >         PER_OSR5 =              0x0003 | STICKY_TIMEOUTS |
> > > WHOLE_SECONDS, ...
> > >         PER_BSD =               0x0006,
> > >         PER_SUNOS =             0x0006 | STICKY_TIMEOUTS,
> > > 
> > > But I can certainly just make it a stand-alone file with just the
> > > bitfield.  Or, I can still do the conversion and ignore PER_OSR5 and
> > > PER_SUNOS.
> > 
> > well.. if "you" as kernel can't really make out what it is, how is poor
> > userspace supposed to do it ?
> 
> Kernel should just print with %lx and leave pretty-printing to
> luserspace.

I would tend to agree with this -- I don't want to fill the kernel with
string-dumping case statements.  (Though I have a different patch that
does this, if anyone actually wants it.)

> And name should be /proc/*/personality (obviously :-)
> 
> Assuming anybody cares about personalities at all.

I do.  :)

-- 
Kees Cook
Ubuntu Security Team
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