From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0DDA5C433E5 for ; Thu, 30 Jul 2020 13:25:32 +0000 (UTC) Received: from us-smtp-delivery-1.mimecast.com (us-smtp-2.mimecast.com [207.211.31.81]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9879820838 for ; Thu, 30 Jul 2020 13:25:31 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9879820838 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=canonical.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linux-audit-bounces@redhat.com Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-73-zS3ovnCfPQyArPOo6QtSlg-1; Thu, 30 Jul 2020 09:25:28 -0400 X-MC-Unique: zS3ovnCfPQyArPOo6QtSlg-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 571171893DD9; Thu, 30 Jul 2020 13:25:25 +0000 (UTC) Received: from colo-mx.corp.redhat.com (colo-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.20]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 264CD19D9E; Thu, 30 Jul 2020 13:25:25 +0000 (UTC) Received: from lists01.pubmisc.prod.ext.phx2.redhat.com (lists01.pubmisc.prod.ext.phx2.redhat.com [10.5.19.33]) by colo-mx.corp.redhat.com (Postfix) with ESMTP id A5BC31800B6C; Thu, 30 Jul 2020 13:25:22 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) by lists01.pubmisc.prod.ext.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id 06UA7I6M017176 for ; Thu, 30 Jul 2020 06:07:19 -0400 Received: by smtp.corp.redhat.com (Postfix) id D4F532026D67; Thu, 30 Jul 2020 10:07:18 +0000 (UTC) Received: from mimecast-mx02.redhat.com (mimecast03.extmail.prod.ext.rdu2.redhat.com [10.11.55.19]) by smtp.corp.redhat.com (Postfix) with ESMTPS id D08432026D69 for ; Thu, 30 Jul 2020 10:07:15 +0000 (UTC) Received: from us-smtp-1.mimecast.com (us-smtp-delivery-1.mimecast.com [205.139.110.120]) (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 8BF808007D0 for ; Thu, 30 Jul 2020 10:07:15 +0000 (UTC) Received: from youngberry.canonical.com (youngberry.canonical.com [91.189.89.112]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-174-CGJv5NIrMrOND60k8KpVeA-1; Thu, 30 Jul 2020 06:07:01 -0400 X-MC-Unique: CGJv5NIrMrOND60k8KpVeA-1 Received: from static-50-53-58-29.bvtn.or.frontiernet.net ([50.53.58.29] helo=[192.168.192.153]) by youngberry.canonical.com with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.86_2) (envelope-from ) id 1k15Sf-0002wr-0v; Thu, 30 Jul 2020 10:06:53 +0000 Subject: Re: [PATCH v19 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: <20200724203226.16374-1-casey@schaufler-ca.com> <20200724203226.16374-23-casey@schaufler-ca.com> From: John Johansen Autocrypt: addr=john.johansen@canonical.com; prefer-encrypt=mutual; keydata= LS0tLS1CRUdJTiBQR1AgUFVCTElDIEtFWSBCTE9DSy0tLS0tCgptUUlOQkU1bXJQb0JFQURB azE5UHNnVmdCS2tJbW1SMmlzUFE2bzdLSmhUVEtqSmR3VmJrV1NuTm4rbzZVcDVrCm5LUDFm NDlFQlFsY2VXZzF5cC9Od2JSOGFkK2VTRU8vdW1hL0srUHFXdkJwdEtDOVNXRDk3Rkc0dUI0 L2Nhb20KTEVVOTdzTFFNdG52R1dkeHJ4VlJHTTRhbnpXWU1neno1VFptSWlWVFo0M091NVZw YVMxVnoxWlN4UDNoL3hLTgpaci9UY1c1V1FhaTh1M1BXVm5ia2poU1pQSHYxQmdoTjY5cXhF UG9tckpCbTFnbXR4M1ppVm1GWGx1d1RtVGdKCk9rcEZvbDduYkowaWxuWUhyQTdTWDNDdFIx dXBlVXBNYS9XSWFuVk85NldkVGpISElhNDNmYmhtUXViZTR0eFMKM0ZjUUxPSlZxUXN4NmxF OUI3cUFwcG05aFExMHFQV3dkZlB5LyswVzZBV3ROdTVBU2lHVkNJbld6bDJIQnFZZAovWmxs OTN6VXErTklvQ244c0RBTTlpSCt3dGFHRGNKeXdJR0luK2VkS050SzcyQU1nQ2hUZy9qMVpv V0g2WmVXClBqdVVmdWJWelp0bzFGTW9HSi9TRjRNbWRRRzFpUU50ZjRzRlpiRWdYdXk5Y0dp MmJvbUYwenZ5QkpTQU5weGwKS05CRFlLek42S3owOUhVQWtqbEZNTmdvbUwvY2pxZ0FCdEF4 NTlMK2RWSVpmYUYyODFwSWNVWnp3dmg1K0pvRwplT1c1dUJTTWJFN0wzOG5zem9veWtJSjVY ckFjaGtKeE5mejdrK0ZuUWVLRWtOekVkMkxXYzNRRjRCUVpZUlQ2ClBISGdhM1JneWtXNSsx d1RNcUpJTGRtdGFQYlhyRjNGdm5WMExSUGN2NHhLeDdCM2ZHbTd5Z2Rvb3dBUkFRQUIKdEIx S2IyaHVJRXB2YUdGdWMyVnVJRHhxYjJodVFHcHFiWGd1Ym1WMFBva0NPZ1FUQVFvQUpBSWJB d1VMQ1FnSApBd1VWQ2drSUN3VVdBZ01CQUFJZUFRSVhnQVVDVG8wWVZ3SVpBUUFLQ1JBRkx6 WndHTlhEMkx4SkQvOVRKWkNwCndsbmNUZ1llcmFFTWVEZmtXdjhjMUlzTTFqMEFtRTRWdEwr ZkU3ODBaVlA5Z2tqZ2tkWVN4dDdlY0VUUFRLTWEKWlNpc3JsMVJ3cVUwb29nWGRYUVNweHJH SDAxaWN1LzJuMGpjWVNxWUtnZ1B4eTc4QkdzMkxacTRYUGZKVFptSApaR25YR3EvZURyL21T bmowYWF2QkptTVo2amJpUHo2eUh0QllQWjlmZG84YnRjendQNDFZZVdvSXUyNi84SUk2CmYw WG0zVkM1b0FhOHY3UmQrUldaYThUTXdsaHpIRXh4ZWwzanRJN0l6ek9zbm1FOS84RG0wQVJE NWlUTENYd1IKMWN3SS9KOUJGL1MxWHY4UE4xaHVUM0l0Q05kYXRncDh6cW9Ka2dQVmptdnlM NjRRM2ZFa1liZkhPV3NhYmE5LwprQVZ0Qk56OVJURmg3SUhEZkVDVmFUb3VqQmQ3QnRQcXIr cUlqV0ZhZEpEM0k1ZUxDVkp2VnJyb2xyQ0FUbEZ0Ck4zWWtRczZKbjFBaUlWSVUzYkhSOEdq ZXZnejVMbDZTQ0dIZ1Jya3lScG5TWWFVL3VMZ24zN042QVl4aS9RQUwKK2J5M0N5RUZManpX QUV2eVE4YnEzSXVjbjdKRWJoUy9KLy9kVXFMb2VVZjh0c0dpMDB6bXJJVFpZZUZZQVJoUQpN dHNmaXpJclZEdHoxaVBmL1pNcDVnUkJuaXlqcFhuMTMxY20zTTNndjZIclFzQUdubjhBSnJ1 OEdEaTVYSllJCmNvLzEreC9xRWlOMm5DbGFBT3BiaHpOMmVVdlBEWTVXMHEzYkEvWnAybWZH NTJ2YlJJK3RRMEJyMUhkL3ZzbnQKVUhPOTAzbU1aZXAyTnpOM0JaNXFFdlB2RzRyVzVacTJE cHliV2JRclNtOW9iaUJLYjJoaGJuTmxiaUE4YW05bwpiaTVxYjJoaGJuTmxia0JqWVc1dmJt bGpZV3d1WTI5dFBva0NOd1FUQVFvQUlRVUNUbzBYV2dJYkF3VUxDUWdICkF3VVZDZ2tJQ3dV V0FnTUJBQUllQVFJWGdBQUtDUkFGTHpad0dOWEQySXRNRC85anliYzg3ZE00dUFIazZ5Tk0K TjBZL0JGbW10VFdWc09CaHFPbm9iNGkzOEJyRE8yQzFoUUNQQ1FlNExMczEvNHB0ZW92UXQ4 QjJGeXJQVmp3Zwo3alpUSE5LNzRyNmxDQ1Z4eDN5dTFCN1U5UG80VlRrY3NsVmIxL3FtV3V4 OFhXY040eXZrVHFsTCtHeHB5Sm45CjlaWmZmWEpjNk9oNlRtT2ZiS0d2TXV1djVhclNJQTNK SEZMZjlhTHZadEExaXNKVXI3cFM5YXBnOXVUVUdVcDcKd2ZWMFdUNlQzZUczbXRVVTJ1cDVK VjQ4NTBMMDVqSFM2dVdpZS9ZK3lmSk9iaXlyeE4vNlpxVzVHb25oTEJxLwptc3pjVjV2QlQz QkRWZTNSdkY2WGRNOU9oUG4xK1k4MXg1NCt2UTExM044aUx3RjdHR2ExNFp5SVZBTlpEMEkw CkhqUnZhMmsvUnFJUlR6S3l1UEg1cGtsY0tIVlBFRk1tT3pNVCtGT294Tmp2Uys3K3dHMktN RFlFbUhQcjFQSkIKWlNaZUh6SzE5dGZhbFBNcHBGeGkrc3lZTGFnTjBtQjdKSFF3WTdjclV1 T0RoeWNxNjBZVnoxdGFFeWd1M1l2MgoyL0kxRUNHSHZLSEc2d2M5MG80M0MvZWxIRUNYbkVo N3RLcGxEY3BJQytPQ21NeEtIaFI0NitYY1p2Z3c0RGdiCjdjYTgzZVFSM0NHODlMdlFwVzJM TEtFRUJEajdoWmhrTGJra1BSWm0zdzhKWTQ0YXc4VnRneFdkblNFTUNMeEwKSU9OaDZ1Wjcv L0RZVnRjSWFNSllrZWJhWnRHZENwMElnVVpiMjQvVmR2WkNZYk82MkhrLzNWbzFuWHdIVUVz Mwo2RC92MWJUMFJaRmk2OUxnc0NjT2N4NGdZTGtDRFFST1pxejZBUkFBb3F3NmtrQmhXeU0x ZnZnYW1BVmplWjZuCktFZm5SV2JrQzk0TDFFc0pMdXAzV2IyWDBBQk5PSFNrYlNENHBBdUMy dEtGL0VHQnQ1Q1A3UWRWS1JHY1F6QWQKNmIyYzFJZHk5Ukx3Nnc0Z2krbm4vZDFQbTFra1lo a1NpNXpXYUlnMG01UlFVaytFbDh6a2Y1dGNFLzFOMFo1TwpLMkpoandGdTViWDBhMGw0Y0ZH V1ZRRWNpVk1ES1J0eE1qRXRrM1N4RmFsbTZaZFEycHAyODIyY2xucTR6WjltCld1MWQyd2F4 aXorYjVJYTR3ZURZYTduNDFVUmNCRVViSkFnbmljSmtKdENUd3lJeElXMktuVnlPcmp2a1F6 SUIKdmFQMEZkUDJ2dlpvUE1kbENJek9sSWtQTGd4RTBJV3VlVFhlQkpoTnMwMXBiOGJMcW1U SU1sdTRMdkJFTEEvdgplaWFqajVzOHk1NDJIL2FIc2ZCZjRNUVVoSHhPL0JaVjdoMDZLU1Vm SWFZN09nQWdLdUdOQjNVaWFJVVM1K2E5CmduRU9RTER4S1J5L2E3UTF2OVMrTnZ4KzdqOGlI M2prUUpoeFQ2WkJoWkdSeDBna0gzVCtGMG5ORG01TmFKVXMKYXN3Z0pycUZaa1VHZDJNcm0x cW5Ld1hpQXQ4U0ljRU5kcTMzUjBLS0tSQzgwWGd3ajhKbjMwdlhMU0crTk8xRwpIMFVNY0F4 TXd5L3B2azZMVTVKR2paUjczSjVVTFZoSDRNTGJEZ2dEM21QYWlHOCtmb3RUckpVUHFxaGc5 aHlVCkVQcFlHN3NxdDc0WG43OStDRVpjakxIenlsNnZBRkUyVzBreGxMdFF0VVpVSE8zNmFm RnY4cUdwTzNacVB2akIKVXVhdFhGNnR2VVFDd2YzSDZYTUFFUUVBQVlrQ0h3UVlBUW9BQ1FV Q1RtYXMrZ0liREFBS0NSQUZMelp3R05YRAoyRC9YRC8wZGRNLzRhaTFiK1RsMWp6bkthalgz a0crTWVFWWVJNGY0MHZjbzNyT0xyblJHRk9jYnl5ZlZGNjlNCktlcGllNE93b0kxamNUVTBB RGVjbmJXbkROSHByMFNjenhCTXJvM2Juckxoc212anVuVFlJdnNzQlp0QjRhVkoKanVMSUxQ VWxuaEZxYTdmYlZxMFpRamJpVi9ydDJqQkVOZG05cGJKWjZHam5wWUljQWJQQ0NhL2ZmTDQv U1FSUwpZSFhvaEdpaVM0eTVqQlRtSzVsdGZld0xPdzAyZmtleEgrSUpGcnJHQlhEU2c2bjJT Z3hubisrTkYzNGZYY205CnBpYXczbUtzSUNtKzBoZE5oNGFmR1o2SVdWOFBHMnRlb29WRHA0 ZFlpaCsreFgvWFM4ekJDYzFPOXc0bnpsUDIKZ0t6bHFTV2JoaVdwaWZSSkJGYTRXdEFlSlRk WFlkMzdqL0JJNFJXV2hueXc3YUFQTkdqMzN5dEdITlVmNlJvMgovanRqNHRGMXkvUUZYcWpK Ry93R2pwZHRSZmJ0VWpxTEhJc3ZmUE5OSnEvOTU4cDc0bmRBQ2lkbFdTSHpqK09wCjI2S3Bi Rm5td05PMHBzaVVzbmh2SEZ3UE8vdkFibDNSc1I1KzBSbytodnMyY0VtUXV2OXIvYkRsQ2Zw enAydDMKY0srcmh4VXFpc094OERaZnoxQm5rYW9DUkZidnZ2ays3TC9mb21QbnRHUGtxSmNp WUU4VEdIa1p3MWhPa3UrNApPb00yR0I1bkVEbGorMlRGL2pMUStFaXBYOVBrUEpZdnhmUmxD NmRLOFBLS2ZYOUtkZm1BSWNnSGZuVjFqU24rCjh5SDJkakJQdEtpcVcwSjY5YUlzeXg3aVYv MDNwYVBDakpoN1hxOXZBenlkTjVVL1VBPT0KPTZQL2IKLS0tLS1FTkQgUEdQIFBVQkxJQyBL RVkgQkxPQ0stLS0tLQo= Organization: Canonical Message-ID: Date: Thu, 30 Jul 2020 03:03:55 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20200724203226.16374-23-casey@schaufler-ca.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.78 on 10.11.54.4 X-loop: linux-audit@redhat.com X-Mailman-Approved-At: Thu, 30 Jul 2020 09:25:21 -0400 Cc: 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 2.84 on 10.5.11.23 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=linux-audit-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit On 7/24/20 1:32 PM, Casey Schaufler wrote: > Add an entry /proc/.../attr/context which displays the full > process security "context" in compound format: > lsm1\0value\0lsm2\0value\0... > This entry is not writable. > > A security module may decide that its policy does not allow > this information to be displayed. In this case none of the > information will be displayed. > > Reviewed-by: Kees Cook > Signed-off-by: Casey Schaufler > Cc: linux-api@vger.kernel.org > --- > Documentation/security/lsm.rst | 28 +++++++++++ > fs/proc/base.c | 1 + > include/linux/lsm_hooks.h | 6 +++ > security/apparmor/include/procattr.h | 2 +- > security/apparmor/lsm.c | 8 +++- > security/apparmor/procattr.c | 22 +++++---- > security/security.c | 70 ++++++++++++++++++++++++++++ > security/selinux/hooks.c | 2 +- > security/smack/smack_lsm.c | 2 +- > 9 files changed, 126 insertions(+), 15 deletions(-) > > 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. > +Each field may contain whitespace or non-printable characters. > +The nul bytes are included in the size of a compound context. > +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. > diff --git a/fs/proc/base.c b/fs/proc/base.c > index 40471a12ced2..ba8b0316e999 100644 > --- a/fs/proc/base.c > +++ b/fs/proc/base.c > @@ -2795,6 +2795,7 @@ static const struct pid_entry attr_dir_stuff[] = { > ATTR(NULL, "keycreate", 0666), > ATTR(NULL, "sockcreate", 0666), > ATTR(NULL, "display", 0666), > + ATTR(NULL, "context", 0444), > #ifdef CONFIG_SECURITY_SMACK > DIR("smack", 0555, > proc_smack_attr_dir_inode_ops, proc_smack_attr_dir_ops), > diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h > index 6908fa03cf31..5be04dacc17a 100644 > --- a/include/linux/lsm_hooks.h > +++ b/include/linux/lsm_hooks.h > @@ -1359,6 +1359,12 @@ > * @pages contains the number of pages. > * Return 0 if permission is granted. > * > + * @getprocattr: > + * Provide the named process attribute for display in special files in > + * the /proc/.../attr directory. Attribute naming and the data displayed > + * is at the discretion of the security modules. The exception is the > + * "context" attribute, which will contain the security context of the > + * task as a nul terminated text string without trailing whitespace. > * @ismaclabel: > * Check if the extended attribute specified by @name > * represents a MAC label. Returns 1 if name is a MAC > diff --git a/security/apparmor/include/procattr.h b/security/apparmor/include/procattr.h > index 31689437e0e1..03dbfdb2f2c0 100644 > --- a/security/apparmor/include/procattr.h > +++ b/security/apparmor/include/procattr.h > @@ -11,7 +11,7 @@ > #ifndef __AA_PROCATTR_H > #define __AA_PROCATTR_H > > -int aa_getprocattr(struct aa_label *label, char **string); > +int aa_getprocattr(struct aa_label *label, char **string, bool newline); > int aa_setprocattr_changehat(char *args, size_t size, int flags); > > #endif /* __AA_PROCATTR_H */ > diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c > index 31a6f11890f1..7ce570b0f491 100644 > --- a/security/apparmor/lsm.c > +++ b/security/apparmor/lsm.c > @@ -593,6 +593,7 @@ static int apparmor_getprocattr(struct task_struct *task, char *name, > const struct cred *cred = get_task_cred(task); > struct aa_task_ctx *ctx = task_ctx(current); > struct aa_label *label = NULL; > + bool newline = true; > > if (strcmp(name, "current") == 0) > label = aa_get_newest_label(cred_label(cred)); > @@ -600,11 +601,14 @@ static int apparmor_getprocattr(struct task_struct *task, char *name, > label = aa_get_newest_label(ctx->previous); > else if (strcmp(name, "exec") == 0 && ctx->onexec) > label = aa_get_newest_label(ctx->onexec); > - else > + else if (strcmp(name, "context") == 0) { > + label = aa_get_newest_label(cred_label(cred)); > + newline = false; > + } else > error = -EINVAL; > > if (label) > - error = aa_getprocattr(label, value); > + error = aa_getprocattr(label, value, newline); > > aa_put_label(label); > put_cred(cred); > diff --git a/security/apparmor/procattr.c b/security/apparmor/procattr.c > index c929bf4a3df1..be3b083d9b74 100644 > --- a/security/apparmor/procattr.c > +++ b/security/apparmor/procattr.c > @@ -20,6 +20,7 @@ > * aa_getprocattr - Return the profile information for @profile > * @profile: the profile to print profile info about (NOT NULL) > * @string: Returns - string containing the profile info (NOT NULL) > + * @newline: Should a newline be added to @string. > * > * Returns: length of @string on success else error on failure > * > @@ -30,20 +31,21 @@ > * > * Returns: size of string placed in @string else error code on failure > */ > -int aa_getprocattr(struct aa_label *label, char **string) > +int aa_getprocattr(struct aa_label *label, char **string, bool newline) > { > struct aa_ns *ns = labels_ns(label); > struct aa_ns *current_ns = aa_get_current_ns(); > + int flags = FLAG_VIEW_SUBNS | FLAG_HIDDEN_UNCONFINED; > int len; > > if (!aa_ns_visible(current_ns, ns, true)) { > aa_put_ns(current_ns); > return -EACCES; > } > + if (newline) > + flags |= FLAG_SHOW_MODE; > > - len = aa_label_snxprint(NULL, 0, current_ns, label, > - FLAG_SHOW_MODE | FLAG_VIEW_SUBNS | > - FLAG_HIDDEN_UNCONFINED); > + len = aa_label_snxprint(NULL, 0, current_ns, label, flags); > AA_BUG(len < 0); > > *string = kmalloc(len + 2, GFP_KERNEL); > @@ -52,19 +54,19 @@ int aa_getprocattr(struct aa_label *label, char **string) > return -ENOMEM; > } > > - len = aa_label_snxprint(*string, len + 2, current_ns, label, > - FLAG_SHOW_MODE | FLAG_VIEW_SUBNS | > - FLAG_HIDDEN_UNCONFINED); > + len = aa_label_snxprint(*string, len + 2, current_ns, label, flags); > if (len < 0) { > aa_put_ns(current_ns); > return len; > } > > - (*string)[len] = '\n'; > - (*string)[len + 1] = 0; > + if (newline) { > + (*string)[len] = '\n'; > + (*string)[++len] = 0; > + } > > aa_put_ns(current_ns); > - return len + 1; > + return len; > } > > /** > diff --git a/security/security.c b/security/security.c > index d35e578fa45b..bce6be720401 100644 > --- a/security/security.c > +++ b/security/security.c > @@ -754,6 +754,48 @@ static void __init lsm_early_task(struct task_struct *task) > panic("%s: Early task alloc failed.\n", __func__); > } > > +/** > + * append_ctx - append a lsm/context pair to a compound context > + * @ctx: the existing compound context > + * @ctxlen: size of the old context, including terminating nul byte > + * @lsm: new lsm name, nul terminated > + * @new: new context, possibly nul terminated > + * @newlen: maximum size of @new > + * > + * replace @ctx with a new compound context, appending @newlsm and @new > + * to @ctx. On exit the new data replaces the old, which is freed. > + * @ctxlen is set to the new size, which includes a trailing nul byte. > + * > + * Returns 0 on success, -ENOMEM if no memory is available. > + */ > +static int append_ctx(char **ctx, int *ctxlen, const char *lsm, char *new, > + int newlen) > +{ > + char *final; > + size_t llen; > + > + llen = strlen(lsm) + 1; > + /* > + * A security module may or may not provide a trailing nul on > + * when returning a security context. There is no definition > + * of which it should be, and there are modules that do it > + * each way. > + */ > + newlen = strnlen(new, newlen) + 1; > + > + final = kzalloc(*ctxlen + llen + newlen, GFP_KERNEL); > + if (final == NULL) > + return -ENOMEM; > + if (*ctxlen) > + memcpy(final, *ctx, *ctxlen); > + memcpy(final + *ctxlen, lsm, llen); > + memcpy(final + *ctxlen + llen, new, newlen); if @new doesn't have a newline appended at its end this will read 1 byte passed the end of the @new buffer. Nor will the result have a trailing \0 as expected unless we get lucky. > + kfree(*ctx); > + *ctx = final; > + *ctxlen = *ctxlen + llen + newlen; > + return 0; > +} > + > /* > * The default value of the LSM hook is defined in linux/lsm_hook_defs.h and > * can be accessed with: > @@ -2124,6 +2166,10 @@ int security_getprocattr(struct task_struct *p, const char *lsm, char *name, > char **value) > { > struct security_hook_list *hp; > + char *final = NULL; > + char *cp; > + int rc = 0; > + int finallen = 0; these are only used by context so they could be moved under its if, this is really just a style comment and I'll leave it up to you > int display = lsm_task_display(current); > int slot = 0; > > @@ -2151,6 +2197,30 @@ int security_getprocattr(struct task_struct *p, const char *lsm, char *name, > return -ENOMEM; > } > > + if (!strcmp(name, "context")) { > + hlist_for_each_entry(hp, &security_hook_heads.getprocattr, > + list) { > + rc = hp->hook.getprocattr(p, "context", &cp); > + if (rc == -EINVAL) > + continue; > + if (rc < 0) { > + kfree(final); > + return rc; > + } > + rc = append_ctx(&final, &finallen, hp->lsmid->lsm, > + cp, rc); > + kfree(cp); > + if (rc < 0) { > + kfree(final); > + return rc; > + } > + } > + if (final == NULL) > + return -EINVAL; > + *value = final; > + return finallen; > + } > + > hlist_for_each_entry(hp, &security_hook_heads.getprocattr, list) { > if (lsm != NULL && strcmp(lsm, hp->lsmid->lsm)) > continue; > diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c > index c13c207c5da1..43d5c09b9a9e 100644 > --- a/security/selinux/hooks.c > +++ b/security/selinux/hooks.c > @@ -6288,7 +6288,7 @@ static int selinux_getprocattr(struct task_struct *p, > goto bad; > } > > - if (!strcmp(name, "current")) > + if (!strcmp(name, "current") || !strcmp(name, "context")) > sid = __tsec->sid; > else if (!strcmp(name, "prev")) > sid = __tsec->osid; > diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c > index 6f0cdb40addc..d7bb6442f192 100644 > --- a/security/smack/smack_lsm.c > +++ b/security/smack/smack_lsm.c > @@ -3463,7 +3463,7 @@ static int smack_getprocattr(struct task_struct *p, char *name, char **value) > char *cp; > int slen; > > - if (strcmp(name, "current") != 0) > + if (strcmp(name, "current") != 0 && strcmp(name, "context") != 0) > return -EINVAL; > > cp = kstrdup(skp->smk_known, GFP_KERNEL); > -- Linux-audit mailing list Linux-audit@redhat.com https://www.redhat.com/mailman/listinfo/linux-audit