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Fri, 10 Dec 2021 13:02:13 +0000 (GMT) Received: from sig-9-65-75-5.ibm.com (unknown [9.65.75.5]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 10 Dec 2021 13:02:13 +0000 (GMT) Message-ID: Subject: Re: [PATCH v5 15/16] ima: Move dentries into ima_namespace From: Mimi Zohar To: Stefan Berger , Christian Brauner , James Bottomley Cc: linux-integrity@vger.kernel.org, serge@hallyn.com, containers@lists.linux.dev, dmitry.kasatkin@gmail.com, ebiederm@xmission.com, krzysztof.struczynski@huawei.com, roberto.sassu@huawei.com, mpeters@redhat.com, lhinds@redhat.com, lsturman@redhat.com, puiterwi@redhat.com, jamjoom@us.ibm.com, linux-kernel@vger.kernel.org, paul@paul-moore.com, rgb@redhat.com, linux-security-module@vger.kernel.org, jmorris@namei.org Date: Fri, 10 Dec 2021 08:02:13 -0500 In-Reply-To: <6de8d349-74f8-7be4-3854-5c4ac72860ad@linux.ibm.com> References: <20211208221818.1519628-1-stefanb@linux.ibm.com> <20211208221818.1519628-16-stefanb@linux.ibm.com> <20211209143428.ip6bwry5hqtee5vy@wittgenstein> <20211209143749.wk4agkynfqdzftbl@wittgenstein> <20211210114934.tacjnwryihrsx6ln@wittgenstein> <2587716d7d021c35e3b6ef22b6e30f44c2b3f98e.camel@linux.ibm.com> <6de8d349-74f8-7be4-3854-5c4ac72860ad@linux.ibm.com> Content-Type: text/plain; charset="ISO-8859-15" X-Mailer: Evolution 3.28.5 (3.28.5-18.el8) Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: u2ZDp_iAvevGhiUByT_N8lL_5jN6cTpM X-Proofpoint-GUID: ANty0JWsO92036xgJFMrTIdrfEXb7u7e X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2021-12-10_03,2021-12-10_01,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 mlxlogscore=999 malwarescore=0 suspectscore=0 adultscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 bulkscore=0 spamscore=0 priorityscore=1501 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2112100073 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2021-12-10 at 07:40 -0500, Stefan Berger wrote: > On 12/10/21 07:09, Mimi Zohar wrote: > > On Fri, 2021-12-10 at 12:49 +0100, Christian Brauner wrote: > >>> There's still the problem that if you write the policy, making the file > >>> disappear then unmount and remount securityfs it will come back. My > >>> guess for fixing this is that we only stash the policy file reference, > >>> create it if NULL but then set the pointer to PTR_ERR(-EINVAL) or > >>> something and refuse to create it for that value. > >> Some sort of indicator that gets stashed in struct ima_ns that the file > >> does not get recreated on consecutive mounts. That shouldn't be hard to > >> fix. > > The policy file disappearing is for backwards compatibility, prior to > > being able to extend the custom policy. For embedded usecases, > > allowing the policy to be written exactly once might makes sense. Do > > we really want/need to continue to support removing the policy in > > namespaces? > > I don't have an answer but should the behavior for the same #define in > this case be different for host and namespaces? Or should we just > 'select IMA_WRITE_POLICY and IMA_READ_POLICY' when IMA_NS is selected? The latter option sounds good. Being able to analyze the namespace policy is really important. thanks, Mimi