From: dwalsh@redhat.com (Daniel J Walsh)
Date: Wed, 02 Mar 2011 14:07:37 -0500
Subject: [refpolicy] [PATCH 32/34]: patch to allow mount use kernel file
 descriptors
In-Reply-To: <1299013715.14035.52.camel@tesla.lan>
References: <1297838523.3205.120.camel@tesla.lan>	<4D6BB9CC.7060406@tresys.com>
	<1298920576.3123.12.camel@tesla.lan>	<4D6D44C0.5090700@tresys.com>
	<1299013715.14035.52.camel@tesla.lan>
Message-ID: <4D6E9579.1050105@redhat.com>
To: refpolicy@oss.tresys.com
List-Id: refpolicy.oss.tresys.com

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On 03/01/2011 04:08 PM, Guido Trentalancia wrote:
> On Tue, 01/03/2011 at 14.10 -0500, Christopher J. PeBenito wrote:
>> On 02/28/11 14:16, Guido Trentalancia wrote:
>>> On Mon, 28/02/2011 at 10.05 -0500, Christopher J. PeBenito wrote:
>>>> On 02/16/11 01:42, Guido Trentalancia wrote:
>>>>> This patch allows mount to use kernel file descriptors.
>>>>>
>>>>> diff -pruN refpolicy-git-15022011-test/policy/modules/system/mount.te refpolicy-git-15022011-test-new/policy/modules/system/mount.te
>>>>> --- refpolicy-git-15022011-test/policy/modules/system/mount.te	2011-02-16 02:34:33.253189215 +0100
>>>>> +++ refpolicy-git-15022011-test-new/policy/modules/system/mount.te	2011-02-16 03:54:18.732023725 +0100
>>>>> @@ -51,6 +51,7 @@ can_exec(mount_t, mount_exec_t)
>>>>>  
>>>>>  files_tmp_filetrans(mount_t, mount_tmp_t, { file dir })
>>>>>  
>>>>> +kernel_use_fds(mount_t)
>>>>>  kernel_read_system_state(mount_t)
>>>>>  kernel_read_kernel_sysctls(mount_t)
>>>>>  kernel_dontaudit_getattr_core_if(mount_t)
>>>>
>>>> How did you come across this?
>>>
>>> type=1400 audit(1295758153.958:3): avc:  denied  { use } for  pid=1429
>>> comm="mount" path="/dev/pts/0" dev=devpts ino=3
>>> scontext=system_u:system_r:mount_t:s0
>>> tcontext=system_u:system_r:kernel_t:s0 tclass=fd
>>
>> Can you provide more detail?  What was happening on the system?
> 
> Unfortunately I cannot provide more details now. I believe it's
> happening at boot-up. I am also quite sure it's not critical. And the
> only "uncommon" thing that I am using is the /sbin/mount.tmpfs script
> from Fedora (will be obsoleted soon by the way).
> 
> You could just drop it for the time being...
> 
> Regards,
> 
> Guido
> 
> _______________________________________________
> refpolicy mailing list
> refpolicy at oss.tresys.com
> http://oss.tresys.com/mailman/listinfo/refpolicy

I would guess kernel_t opens the /dev/pts/0 file descriptor to stdout
passes it to init, which passes it to initrc_t which passes it to
mount_t.  (init_t could pass it directly to mount_t).


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