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Wed, 26 Aug 2020 14:47:06 -0400 Received: by smtp.corp.redhat.com (Postfix) id CB1C22156A30; Wed, 26 Aug 2020 18:47:05 +0000 (UTC) Received: from mimecast-mx02.redhat.com (mimecast02.extmail.prod.ext.rdu2.redhat.com [10.11.55.18]) by smtp.corp.redhat.com (Postfix) with ESMTPS id C6AC72156A23 for ; Wed, 26 Aug 2020 18:47:03 +0000 (UTC) Received: from us-smtp-1.mimecast.com (us-smtp-1.mimecast.com [205.139.110.61]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id A0A2680121C for ; Wed, 26 Aug 2020 18:47:03 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-338-GXajaslgMzOt24gSl8jc8w-1; Wed, 26 Aug 2020 14:47:01 -0400 X-MC-Unique: GXajaslgMzOt24gSl8jc8w-1 Received: from [2601:1c0:6280:3f0::19c2] by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kAzl5-0000E8-98; Wed, 26 Aug 2020 18:02:51 +0000 Subject: Re: [PATCH v20 22/23] LSM: Add /proc attr entry for full LSM context To: Casey Schaufler , casey.schaufler@intel.com, jmorris@namei.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org References: <20200826145247.10029-1-casey@schaufler-ca.com> <20200826145247.10029-23-casey@schaufler-ca.com> From: Randy Dunlap Message-ID: <2e16e5dc-d040-8e8d-0fda-eb631b4b72e1@infradead.org> Date: Wed, 26 Aug 2020 11:02:46 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.11.0 MIME-Version: 1.0 In-Reply-To: <20200826145247.10029-23-casey@schaufler-ca.com> X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false; X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 X-loop: linux-audit@redhat.com X-Mailman-Approved-At: Wed, 26 Aug 2020 15:01:59 -0400 Cc: john.johansen@canonical.com, linux-api@vger.kernel.org, linux-audit@redhat.com, sds@tycho.nsa.gov X-BeenThere: linux-audit@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: Linux Audit Discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-audit-bounces@redhat.com Errors-To: linux-audit-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=linux-audit-bounces@redhat.com X-Mimecast-Spam-Score: 0.001 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Content-Language: en-US Hi, On 8/26/20 7:52 AM, Casey Schaufler wrote: > diff --git a/Documentation/security/lsm.rst b/Documentation/security/lsm.rst > index 6a2a2e973080..fd4c87358d54 100644 > --- a/Documentation/security/lsm.rst > +++ b/Documentation/security/lsm.rst > @@ -129,3 +129,31 @@ to identify it as the first security module to be registered. > The capabilities security module does not use the general security > blobs, unlike other modules. The reasons are historical and are > based on overhead, complexity and performance concerns. > + > +LSM External Interfaces > +======================= > + > +The LSM infrastructure does not generally provide external interfaces. > +The individual security modules provide what external interfaces they > +require. > + > +The file ``/sys/kernel/security/lsm`` provides a comma > +separated list of the active security modules. > + > +The file ``/proc/pid/attr/display`` contains the name of the security > +module for which the ``/proc/pid/attr/current`` interface will > +apply. This interface can be written to. > + > +The infrastructure does provide an interface for the special > +case where multiple security modules provide a process context. > +This is provided in compound context format. > + > +- `lsm\0value\0lsm\0value\0` > + > +The `lsm` and `value` fields are nul terminated bytestrings. Preferably NUL-terminated > +Each field may contain whitespace or non-printable characters. > +The nul bytes are included in the size of a compound context. NUL > +The context ``Bell\0Secret\0Biba\0Loose\0`` has a size of 23. > + > +The file ``/proc/pid/attr/context`` provides the security > +context of the identified process. thanks. -- ~Randy Reported-by: Randy Dunlap -- Linux-audit mailing list Linux-audit@redhat.com https://www.redhat.com/mailman/listinfo/linux-audit