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From: Dominick Grift <dominick.grift@defensec.nl>
To: James Carter <jwcart2@gmail.com>
Cc: SElinux list <selinux@vger.kernel.org>
Subject: Re: [PATCH v4] secilc/docs: document expandtypeattribute
Date: Tue, 04 Aug 2020 09:18:41 +0200
Message-ID: <ypjlft9298vi.fsf@defensec.nl> (raw)
In-Reply-To: <CAP+JOzQ=wnAWHp7i6OVjpV58QxdFPT63ON7HOLuVHjoL8O2Oqg@mail.gmail.com> (James Carter's message of "Mon, 3 Aug 2020 16:56:50 -0400")

James Carter <jwcart2@gmail.com> writes:

> On Sun, Aug 2, 2020 at 8:39 AM Dominick Grift
> <dominick.grift@defensec.nl> wrote:
>>
>> This was added for Androids Treble in 2017.
>>
>> Signed-off-by: Dominick Grift <dominick.grift@defensec.nl>
>> ---
>> v2: overriden is overridden
>> v3: add link to README.md
>> v4: rephrase and add another example
>>
>>  secilc/docs/README.md              |  1 +
>>  secilc/docs/cil_type_statements.md | 44 ++++++++++++++++++++++++++++++
>>  2 files changed, 45 insertions(+)
>>
>> diff --git a/secilc/docs/README.md b/secilc/docs/README.md
>> index 3f1838e6..efab2a71 100644
>> --- a/secilc/docs/README.md
>> +++ b/secilc/docs/README.md
>> @@ -126,6 +126,7 @@ CIL (Common Intermediate Language)
>>    * [typealiasactual](cil_type_statements.md#typealiasactual)
>>    * [typeattribute](cil_type_statements.md#typeattribute)
>>    * [typeattributeset](cil_type_statements.md#typeattributeset)
>> +  * [expandtypeattribute](cil_type_statements.md#expandtypeattribute)
>>    * [typebounds](cil_type_statements.md#typebounds)
>>    * [typechange](cil_type_statements.md#typechange)
>>    * [typemember](cil_type_statements.md#typemember)
>> diff --git a/secilc/docs/cil_type_statements.md b/secilc/docs/cil_type_statements.md
>> index f9dd3a76..41f0f01a 100644
>> --- a/secilc/docs/cil_type_statements.md
>> +++ b/secilc/docs/cil_type_statements.md
>> @@ -213,6 +213,50 @@ This example is equivalent to `{ domain -kernel.process -ueventd.process -init.p
>>          )
>>      )
>>
>> +expandtypeattribute
>> +-------------------
>> +
>> +Overrides the compiler defaults for the expansion of one or more previously declared [`typeattribute`](cil_type_statements.md#typeattribute) identifiers.
>> +
>> +Note that this statement can be overridden at compile-time with `secilc -X SIZE` and that this functionality is not intended to override `secilc -X SIZE` for individual type attributes!
>> +

<snip> 
> When the value
> is false, the type attribute will not be removed from the policy, even
> if the default expand rules or "-X" option cause the rules involving
> the type attribute to be expanded.

Yes but I cannot produce that. In my earlier test the type attribute
was expanded regardless of the -X option.

In my test I instructed secilc to expand all attributes with more than 3
members (-X 4), then I added a expandtypeattribute statement telling
secilc to not expand pets and colors.

The result was that it expanded pets and colors anyway.

>
> Thanks,
> Jim
>
>> +**Statement definition:**
>> +
>> +    (expandtypeattribute typeattribute_id true|false)
>> +
>> +**Where:**
>> +
>> +<table>
>> +<colgroup>
>> +<col width="25%" />
>> +<col width="75%" />
>> +</colgroup>
>> +<tbody>
>> +<tr class="odd">
>> +<td align="left"><p><code>expandtypeattribute</code></p></td>
>> +<td align="left"><p>The <code>expandtypeattribute</code> keyword.</p></td>
>> +</tr>
>> +<tr class="even">
>> +<td align="left"><p><code>typeattribute_id</code></p></td>
>> +<td align="left"><p>One or more previously declared
>> <code>typeattribute</code> identifiers. Multiple entries consist of
>> a space separated list enclosed in parentheses '()'.</p></td>
>> +</tr>
>> +<tr class="odd">
>> +<td align="left"><p><code>true | false</code></p></td>
>> +<td align="left"><p>Either true or false.</p></td>
>> +</tr>
>> +</tbody>
>> +</table>
>> +
>> +**Examples:**
>> +
>> +This example uses the expandtypeattribute statement to forcibly expand a previously declared `domain` type attribute.
>> +
>> +    (expandtypeattribute domain true)
>> +
>> +This example uses the expandtypeattribute statement to not expand
>> previously declared `file_type` and `port_type` type attributes
>> regardless of compiler defaults.
>> +
>> +    (expandtypeattribute (file_type port_type) false)
>> +
>>  typebounds
>>  ----------
>>
>> --
>> 2.28.0
>>

-- 
gpg --locate-keys dominick.grift@defensec.nl
Key fingerprint = FCD2 3660 5D6B 9D27 7FC6  E0FF DA7E 521F 10F6 4098
https://sks-keyservers.net/pks/lookup?op=get&search=0xDA7E521F10F64098
Dominick Grift

  reply index

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-30  9:23 [PATCH] " Dominick Grift
2020-07-30 11:45 ` [PATCH v2] " Dominick Grift
2020-07-30 13:11   ` [PATCH v3] " Dominick Grift
2020-07-30 22:22     ` James Carter
2020-07-31  7:26       ` Dominick Grift
2020-07-31 19:50         ` James Carter
2020-07-31 20:12           ` Dominick Grift
2020-07-31 20:22             ` James Carter
2020-07-31 21:07               ` Dominick Grift
2020-08-02 12:34       ` [PATCH v4] " Dominick Grift
2020-08-03 20:56         ` James Carter
2020-08-04  7:18           ` Dominick Grift [this message]
2020-08-04 14:45             ` James Carter
2020-08-04 15:48               ` Dominick Grift
2020-08-04 20:23                 ` James Carter
2020-08-04 20:29                   ` Dominick Grift
2020-08-05 19:23                     ` James Carter
2020-08-05 19:48                       ` [PATCH v5] " Dominick Grift
2020-08-05 20:22                         ` James Carter
2020-08-17 15:57                           ` Stephen Smalley

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