From: William Lee Irwin III <wli@holomorphy.com>
To: Roger Luethi <rl@hellgate.ch>
Cc: Albert Cahalan <albert@users.sf.net>,
Stephen Smalley <sds@epoch.ncsc.mil>,
Andrew Morton OSDL <akpm@osdl.org>,
lkml <linux-kernel@vger.kernel.org>,
Albert Cahalan <albert@users.sourceforge.net>,
Paul Jackson <pj@sgi.com>, James Morris <jmorris@redhat.com>,
Chris Wright <chrisw@osdl.org>
Subject: Re: [1/1][PATCH] nproc v2: netlink access to /proc information
Date: Tue, 14 Sep 2004 12:36:26 -0700 [thread overview]
Message-ID: <20040914193626.GG9106@holomorphy.com> (raw)
In-Reply-To: <20040914193139.GA30827@k3.hellgate.ch>
On Tue, 14 Sep 2004 12:07:47 -0700, William Lee Irwin III wrote:
>> Okay, so what kinds of errors are returned in this case, if any, or
>> (worst case) are the offending tasks completely silently dropped?
On Tue, Sep 14, 2004 at 09:31:39PM +0200, Roger Luethi wrote:
> In published code: No access control whatsoever. In dev tree: Silently
> dropped. Possible: Any kind of error and additional information that
> makes sense (we have netlink messages as a transport, after all).
I'm not sure what to make of this.
On Tue, Sep 14, 2004 at 09:31:39PM +0200, Roger Luethi wrote:
> That said, I don't think dropping tasks silently is a "worst case"
> in this scenario. Whatever your error report is going to be, it will
> boil down to saying "some tasks that may or may not live by the time
> you read this have been skipped because some fields that you knew had
> access restrictions prevented providing the information in those cases,
> and I must be cautious about not revealing any sensitive information
> to you so sorry I can't be more helpful". What's a tool going to do
> with that? If it cares to get a complete snapshot, it can simply send
> two requests: One with and one without restricted fields.
> So the tool would, say, request PID/VmSize in the first message and
> environ in the second message. Since only the owner can read the
> environment, the second request would yield answers only for a subset
> of the total process table.
This sounds safe enough, though it's unclear how to predict what fields
may be restricted. I suppose one doesn't try and requests one field at
a time for all tasks in this model of interaction with userspace.
-- wli
next prev parent reply other threads:[~2004-09-14 19:41 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-08 18:40 [0/1][ANNOUNCE] nproc v2: netlink access to /proc information Roger Luethi
2004-09-08 18:41 ` [1/1][PATCH] " Roger Luethi
2004-09-09 0:35 ` William Lee Irwin III
2004-09-09 0:43 ` William Lee Irwin III
2004-09-09 1:15 ` William Lee Irwin III
2004-09-09 1:17 ` [1/2] rediff nproc v2 vs. 2.6.9-rc1-mm4 William Lee Irwin III
2004-09-09 1:21 ` [2/2] handle CONFIG_MMU=n and use new vm stats for CONFIG_MMU=y William Lee Irwin III
2004-09-09 1:22 ` William Lee Irwin III
2004-09-09 1:26 ` [3/2] round up text memory to the nearest page in fs/proc/task_mmu.c William Lee Irwin III
2004-09-09 18:43 ` [1/1][PATCH] nproc v2: netlink access to /proc information Roger Luethi
2004-09-09 18:49 ` William Lee Irwin III
2004-09-09 19:00 ` William Lee Irwin III
2004-09-09 19:02 ` [4/2] consolidate __task_mem() and __task_mem_cheap() William Lee Irwin III
2004-09-09 19:07 ` Roger Luethi
2004-09-09 19:15 ` [5/2] fix nommu VSZ reporting in consolidated task_mem() William Lee Irwin III
2004-09-09 19:11 ` [1/1][PATCH] nproc v2: netlink access to /proc information Roger Luethi
2004-09-09 19:23 ` William Lee Irwin III
2004-09-09 21:19 ` Roger Luethi
2004-09-10 15:30 ` Roger Luethi
2004-09-11 22:25 ` Albert Cahalan
2004-09-12 4:58 ` William Lee Irwin III
2004-09-14 5:59 ` Roger Luethi
2004-09-14 6:18 ` William Lee Irwin III
2004-09-14 6:23 ` William Lee Irwin III
2004-09-14 7:47 ` Greg Ungerer
2004-09-14 8:27 ` Roger Luethi
2004-09-09 11:53 ` Stephen Smalley
2004-09-09 17:22 ` William Lee Irwin III
2004-09-09 17:53 ` Roger Luethi
2004-09-09 20:01 ` Stephen Smalley
2004-09-09 20:48 ` Chris Wright
2004-09-10 12:11 ` Stephen Smalley
2004-09-09 20:55 ` Roger Luethi
2004-09-09 21:05 ` Chris Wright
2004-09-09 21:25 ` Roger Luethi
2004-09-11 22:36 ` Albert Cahalan
2004-09-12 5:00 ` William Lee Irwin III
2004-09-14 6:44 ` Roger Luethi
2004-09-14 7:10 ` William Lee Irwin III
2004-09-14 7:55 ` Roger Luethi
2004-09-14 8:01 ` William Lee Irwin III
2004-09-14 9:27 ` Roger Luethi
2004-09-14 15:37 ` William Lee Irwin III
2004-09-14 16:01 ` Roger Luethi
2004-09-14 16:37 ` William Lee Irwin III
2004-09-14 17:15 ` Roger Luethi
2004-09-14 17:43 ` William Lee Irwin III
2004-09-14 18:45 ` Roger Luethi
2004-09-14 19:07 ` William Lee Irwin III
2004-09-14 19:31 ` Roger Luethi
2004-09-14 19:36 ` William Lee Irwin III [this message]
2004-09-14 19:50 ` Roger Luethi
2004-09-15 11:44 ` Roger Luethi
2004-09-15 20:02 ` Roger Luethi
2004-09-15 20:20 ` William Lee Irwin III
2004-09-15 20:33 ` Roger Luethi
2004-09-15 20:44 ` Roger Luethi
2004-09-14 18:37 ` Chris Wright
2004-09-14 18:55 ` Roger Luethi
2004-09-14 19:05 ` Chris Wright
2004-09-14 21:12 ` Roger Luethi
2004-09-09 20:44 ` Chris Wright
2004-09-16 21:43 ` nproc: So? Roger Luethi
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