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From: David Howells <dhowells-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: Pavel Shilovsky <piastryyy-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: dhowells-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
	Grazvydas Ignotas
	<notasas-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	linux-cifs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Steve French <smfrench-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: DNS resolver cache does not expire
Date: Mon, 27 Jun 2011 13:34:13 +0100	[thread overview]
Message-ID: <21187.1309178053@redhat.com> (raw)
In-Reply-To: <BANLkTikbk1yvwWCvhmqdH1DHZN1PPEz+hw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>

Pavel Shilovsky <piastryyy-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:

> It seems that dns_resolver sets expiry timeout to zero here
> (http://lxr.free-electrons.com/source/security/keys/key.c#L310) and
> doesn't change it - so, it always returns cached value.

That's not the DNS resolver you've provided a pointer to - that's where the
key allocator initialises a new key.

> David, can you comment on this problem, please?

It's not much of a problem.  Userspace needs to set the key timeout before
instantiating the key:

http://git.kernel.org/?p=linux/kernel/git/dhowells/keyutils.git;a=blob;f=key.dns_resolver.c;h=ab9b87875bcd94dae3083b2711207f87ceea7df1;hb=faabd7c8464502becd01972b1a76ab1dfa1906cc#l502

David

  parent reply	other threads:[~2011-06-27 12:34 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-06-23 14:19 DNS resolver cache does not expire Grazvydas Ignotas
     [not found] ` <BANLkTim+Phg+cY6_KAhxhfSeDj1td_GALw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-06-23 19:15   ` Pavel Shilovsky
     [not found]     ` <BANLkTikbk1yvwWCvhmqdH1DHZN1PPEz+hw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-06-23 19:48       ` Steve French
2011-06-23 20:14       ` Jeff Layton
2011-06-27 12:34       ` David Howells [this message]
     [not found]         ` <21187.1309178053-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2011-06-27 17:27           ` Pavel Shilovsky
     [not found]         ` <BANLkTikOq_dT1SF9aZ=0DNdoVOngvygfZw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-06-27 19:42           ` David Howells
     [not found]             ` <28505.1309203730-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2011-06-28  9:47               ` Grazvydas Ignotas
     [not found]             ` <BANLkTinN0pXZsPADfzvO8p+Jf0i3tWtKpw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-06-28 10:10               ` David Howells

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