linux-kernel - Re: [PATCH 4/6] KEYS: Add garbage collection for dead, revoked and expired keys.

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Message-ID: <20090804210101.GB13499@us.ibm.com>
Date:	Tue, 4 Aug 2009 16:01:01 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	David Howells <dhowells@...hat.com>
Cc:	torvalds@...l.org, akpm@...ux-foundation.org, jmorris@...ei.org,
	linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: Re: [PATCH 4/6] KEYS: Add garbage collection for dead, revoked and
	expired keys.

Quoting David Howells (dhowells@...hat.com):
> Serge E. Hallyn <serue@...ibm.com> wrote:
> 
> > These two lines (repeated below) beg for a helper?
> 
> Yeah...  Seems reasonable.
> 
> > Can this happen?  This implies that the number of live keys
> > went up, but we're under keyring->sem?
> 
> An expired key can be updated back to life:
> 
> 	[root@...romeda ~]# keyctl  add user a a @s
> 	619170185
> 	[root@...romeda ~]# keyctl timeout 619170185 5
> 	[root@...romeda ~]# keyctl  show
> 	Session Keyring
> 	       -3 --alswrv      0     0  keyring: _ses
> 	627083299 --alswrv      0    -1   \_ keyring: _uid.0
> 	619170185 --alswrv      0     0   \_ user: a
> 	[root@...romeda ~]# keyctl  show
> 	Session Keyring
> 	       -3 --alswrv      0     0  keyring: _ses
> 	627083299 --alswrv      0    -1   \_ keyring: _uid.0
> 	619170185: key inaccessible (Key has expired)
> 	[root@...romeda ~]# keyctl  add user a a @s
> 	619170185
> 	[root@...romeda ~]# keyctl  show
> 	Session Keyring
> 	       -3 --alswrv      0     0  keyring: _ses
> 	627083299 --alswrv      0    -1   \_ keyring: _uid.0
> 	619170185 --alswrv      0     0   \_ user: a

This won't require keyring->sem?

> > > +		.data = &key_gc_delay,
> > 
> > I see where this variable is defined at top of the patch, but
> > I don't see where it is actually used?
> 
> Bah!  I forgot to add gc.c to the mix.  Sorry about that.
> 
> David
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