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From: ebiederm@xmission.com (Eric W. Biederman)
To: Stephen Smalley <sds@tycho.nsa.gov>
Cc: Andrew Morton <akpm@osdl.org>, Ingo Molnar <mingo@elte.hu>,
	tglx@linutronix.de, linux-kernel@vger.kernel.org,
	selinux@tycho.nsa.gov, jmorris@namei.org
Subject: Re: [PATCH] sysctl selinux: Don't look at table->de
Date: Mon, 29 Jan 2007 12:16:54 -0700	[thread overview]
Message-ID: <m1d54xk5i1.fsf@ebiederm.dsl.xmission.com> (raw)
In-Reply-To: <1170096231.8720.102.camel@moss-spartans.epoch.ncsc.mil> (Stephen Smalley's message of "Mon, 29 Jan 2007 13:43:51 -0500")

Stephen Smalley <sds@tycho.nsa.gov> writes:


>> > If the ctl_table supplied more information about the functional purpose
>> > and the security sensitivity of the sysctl, then we could leverage that
>> > information instead, as long as we can at least derive the current
>> > labelings from that information for compatibility.
>> 
>> What do information do you need to do need?  Do you need extra fields in
> sysctl?
>> I am more than willing to help but I am not familiar enough with selinux
>> to do a reasonable job on my own.
>
> At present, we map the sysctls into functional groups (e.g. net, vm,
> fs, ...) that parallel the sysctl hierarchy so that we can limit access
> to only those programs/processes that need access for their purpose, and
> further partition where it makes sense to do so.  We also separate out
> particularly security sensitive ones like modprobe and hotplug.  So if
> the ctl_table carried some indication of functional grouping and
> security relevance (for some relatively small number of equivalence
> classes), then we could map those to labels instead of the current
> scheme.  And if we could have the ctl_table inherit the information from
> its logical "parent" in the hierarchy by default, then it shouldn't
> require too invasive a patch.

Ok.  So basically what you need is a parent pointer or some other way
of getting the full sysctl_path.   All of the names that show up in /proc
are still present in the ctl_table.

Hmm.  In parse_table we actually call sysctl_perm at each path component,
I'm not doing that in proc_sysctl.c at the moment but that would be easy to
add.

I think I will look at adding the back pointers.  Adding the security
check during lookup is nice but it won't really give you the context
you could use.  There may be a point in adding a security check during
lookup as well, but I think the way the VFS works there are weird implications
there.

Eric

  parent reply	other threads:[~2007-01-29 19:17 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <200701280106.l0S16CG3019873@shell0.pdx.osdl.net>
     [not found] ` <20070127172410.2b041952.akpm@osdl.org>
     [not found]   ` <1169972718.17469.164.camel@localhost.localdomain>
     [not found]     ` <20070128003549.2ca38dc8.akpm@osdl.org>
     [not found]       ` <20070128093358.GA2071@elte.hu>
     [not found]         ` <20070128095712.GA6485@elte.hu>
     [not found]           ` <20070128100627.GA8416@elte.hu>
     [not found]             ` <20070128104548.a835d859.akpm@osdl.org>
2007-01-28 19:21               ` Eric W. Biederman
2007-01-29 13:04                 ` Stephen Smalley
2007-01-29 15:23                   ` James Morris
2007-01-29 17:55                     ` Eric W. Biederman
2007-01-29 19:26                       ` Stephen Smalley
2007-01-29 17:43                   ` Eric W. Biederman
2007-01-29 18:43                     ` Stephen Smalley
2007-01-29 19:08                       ` Casey Schaufler
2007-01-29 20:07                         ` Stephen Smalley
2007-01-30 10:25                         ` Christoph Hellwig
2007-01-30 17:19                           ` Casey Schaufler
2007-01-29 19:16                       ` Eric W. Biederman [this message]
2007-01-29 23:28                       ` Russell Coker
2007-02-06 21:16                   ` [PATCH 1/2] sysctl: Add a parent entry to ctl_table and set the parent entry Eric W. Biederman
2007-02-06 21:21                     ` [PATCH 2/2] sysctl: Restore the selinux path based label lookup for sysctls Eric W. Biederman
2007-02-07 18:24                       ` Stephen Smalley
2007-02-07 21:12                         ` Stephen Smalley
2007-02-07 21:54                           ` Stephen Smalley
2007-02-07 22:21                             ` Eric W. Biederman
2007-02-08 15:07                               ` Stephen Smalley
2007-02-08  1:57                           ` Eric W. Biederman
2007-02-08 15:01                             ` Stephen Smalley
2007-02-08 17:53                               ` Eric W. Biederman
2007-02-08 18:13                                 ` Stephen Smalley
2007-02-08 22:17                                   ` Eric W. Biederman
2007-02-08 22:51                                     ` [PATCH 0/5] sysctl cleanup selinux fixes Eric W. Biederman
2007-02-08 22:53                                       ` [PATCH 1/5] sysctl: Remove declaration of nonexistent sysctl_init() Eric W. Biederman
2007-02-08 22:54                                         ` [PATCH 2/5] sysctl: Set the parent field in the root sysctl table Eric W. Biederman
2007-02-08 22:55                                           ` [PATCH 3/5] sysctl: Fix the selinux_sysctl_get_sid Eric W. Biederman
2007-02-08 23:02                                             ` [PATCH 4/5] selinux: Enhance selinux to always ignore private inodes Eric W. Biederman
2007-02-08 23:04                                               ` [PATCH 5/5] sysctl: Hide the sysctl proc inodes from selinux Eric W. Biederman
2007-02-09 12:26                                               ` [PATCH 4/5] selinux: Enhance selinux to always ignore private inodes Stephen Smalley
2007-02-09 12:24                                             ` [PATCH 3/5] sysctl: Fix the selinux_sysctl_get_sid Stephen Smalley
2007-02-09 11:05                                       ` [PATCH 0/5] sysctl cleanup selinux fixes Andrew Morton
2007-02-09 18:09                                         ` Eric W. Biederman

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