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Wed, 18 Dec 2024 11:02:57 GMT Received: from smtpav06.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3619658073; Wed, 18 Dec 2024 11:02:57 +0000 (GMT) Received: from smtpav06.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8EAD258077; Wed, 18 Dec 2024 11:02:55 +0000 (GMT) Received: from li-43857255-d5e6-4659-90f1-fc5cee4750ad.ibm.com (unknown [9.61.145.1]) by smtpav06.wdc07v.mail.ibm.com (Postfix) with ESMTP; Wed, 18 Dec 2024 11:02:55 +0000 (GMT) Message-ID: Subject: Re: [RFC 0/2] ima: evm: Add kernel cmdline options to disable IMA/EVM From: Mimi Zohar To: Casey Schaufler , Song Liu , linux-fsdevel@vger.kernel.org, linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org Cc: roberto.sassu@huawei.com, dmitry.kasatkin@gmail.com, eric.snowberg@oracle.com, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, kernel-team@meta.com, brauner@kernel.org, jack@suse.cz, viro@zeniv.linux.org.uk Date: Wed, 18 Dec 2024 06:02:55 -0500 In-Reply-To: References: <20241217202525.1802109-1-song@kernel.org> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.52.4 (3.52.4-2.fc40) Precedence: bulk X-Mailing-List: linux-integrity@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: PR0_6VDIFxuKIqMRZxVmkcCSCK8bPD3N X-Proofpoint-ORIG-GUID: Se6wyub2I67PDfXPzx-0XCsLmEvb-SN- X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-10-15_01,2024-10-11_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 lowpriorityscore=0 clxscore=1011 spamscore=0 priorityscore=1501 suspectscore=0 adultscore=0 mlxscore=0 malwarescore=0 bulkscore=0 mlxlogscore=883 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2412180088 On Tue, 2024-12-17 at 13:29 -0800, Casey Schaufler wrote: > On 12/17/2024 12:25 PM, Song Liu wrote: > > While reading and testing LSM code, I found IMA/EVM consume per inode > > storage even when they are not in use. Add options to diable them in > > kernel command line. The logic and syntax is mostly borrowed from an > > old serious [1]. >=20 > Why not omit ima and evm from the lsm=3D parameter? Casey, Paul, always enabling IMA & EVM as the last LSMs, if configured, wer= e the conditions for making IMA and EVM LSMs. Up to that point, only when an ino= de was in policy did it consume any memory (rbtree). I'm pretty sure you reme= mber the rather heated discussion(s). Mimi >=20 > >=20 > > [1] https://lore.kernel.org/lkml/cover.1398259638.git.d.kasatkin@samsun= g.com/ > >=20 > > Song Liu (2): > > ima: Add kernel parameter to disable IMA > > evm: Add kernel parameter to disable EVM > >=20 > > security/integrity/evm/evm.h | 6 ++++++ > > security/integrity/evm/evm_main.c | 22 ++++++++++++++-------- > > security/integrity/evm/evm_secfs.c | 3 ++- > > security/integrity/ima/ima_main.c | 13 +++++++++++++ > > 4 files changed, 35 insertions(+), 9 deletions(-) > >=20 > > -- > > 2.43.5 > >=20 >=20