linux-kernel - Re: lgetxattr()/getxattr() return different values on a file labelled with selinux disabled

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Message-ID: <514319D4.6050200@tycho.nsa.gov>
Date:	Fri, 15 Mar 2013 08:53:40 -0400
From:	Stephen Smalley <sds@...ho.nsa.gov>
To:	Thomas COUDRAY <amanone@...il.com>
CC:	jmorris@...ei.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, Eric Paris <eparis@...isplace.org>
Subject: Re: lgetxattr()/getxattr() return different values on a file labelled
 with selinux disabled

On 03/15/2013 06:54 AM, Thomas COUDRAY wrote:
> Hi,
> I encounter trouble that I can't explain when labelling my files.
> Here are steps to reproduce (on both 3.2.37 and 3.7.3, with selinux, on
> an ext4 fs):
> 0 - have a regular file "f", with a "before_t" security.selinux attribute
> 1 - reboot with selinux=0
> 2 - change the label to "after_t" (setfattr or chcon)
> 3 - both "ls -Z" (who calls lgetxattr(2)) and "getfattr -n
> security.selinux" (who calls getxattr(2)) show "after_t"
> 4 - reboot with selinux enabled
> 5 - now ls prints "before_t", and getfattr "after_t".
>
> I ran a small test that calls both syscalls (lgetxattr/getxattr), I
> get "before_t" as expected
> If I touch /.autorelabel, both ls/getfattr give "before_t".

f is truly a regular file and not a symlink pointing to a regular file?
before_t and after_t are both defined in the policy?
before_t and after_t are not type aliases of each other?
What are the credentials (capabilities and SELinux security 
context/permissions) of the process running the ls and getfattr commands?
Any relevant messages from SELinux in dmesg output?


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