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Mon, 24 Aug 2026 15:00:50 +0000 (GMT) Received: from li-43857255-d5e6-4659-90f1-fc5cee4750ad.ibm.com (unknown [9.61.99.227]) by smtpav05.wdc07v.mail.ibm.com (Postfix) with ESMTP; Mon, 24 Aug 2026 15:00:50 +0000 (GMT) Message-ID: Subject: Re: [PATCH] ima: clean up IMA_MEASURE_PCR_IDX in Kconfig From: Mimi Zohar To: Julian Braha , roberto.sassu@huawei.com, dmitry.kasatkin@gmail.com, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com Cc: eric.snowberg@oracle.com, linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <20260822001545.354195-1-julianbraha@gmail.com> References: <20260822001545.354195-1-julianbraha@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Date: Mon, 24 Aug 2026 11:00:52 -0400 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Evolution 3.58.3 (3.58.3-1.fc43) X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-GUID: lSIC-83PxmPB0rmylq3bvUStF9kSzhmG X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODI0MDEyMiBTYWx0ZWRfX4KX+wKYWgL1e ErtEjw5opoCmWx48wFVa6NjypulM00b8UgrXjRjCERgohSfow+VFdDEbfD4n1+POHSceDAxL3AK PGgQ/uQgoHUBAJh2o0rq1QPswmqGDqpRj8q1ODR00vjvu5Hfoqu5kpOhEy3QkPHrgrT9mNK8Ltz hYmEjcngMFUQ1vib7EZzEcyUh0KOgQjcDjch48fP7nhgNFjdgLbw1D/ntU8nFu0gKfW2F03oej+ kr24mMFYIgeubb0fDadxx1Oe6B2yEg/CzYNnM8WJ56n6Wi30BcU95iPLSsjFDmTaj/wJ/nX/OEB lGhZZcsI9+oN9qnobRdWMdVrfWqqPy0ZXfUi+7WRHj5P3OuSkbYOBanmi1UMy1LdevRkcQYbNr8 RL97NqqoKxmaLzTx2dhZKgueHtxfzNjcLs/xMdHjQT9mye4DfSQcOwmFzVM3G7ivzkZ6B/ruIdt beQUECS+qbsuYWvsV2w== X-Authority-Analysis: v=2.4 cv=Y/nIdBeN c=1 sm=1 tr=0 ts=6a8c5ca6 cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=pGLkceISAAAA:8 a=d3y6Pl4EezBHqMEs6AAA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Info: AW1haW4tMjYwODI0MDEyMiBTYWx0ZWRfX33qnKY50u3T9 41ctrPYVjJQtKKoaP1DdWhAdtLs/dRptRHa8/rlNFOFRE3JlB7WX8G2yzDLIJVDE91wORIyhDnO Aw5FelxTgDxlNnq+lnlUs9Cc0q+yOOw= X-Proofpoint-ORIG-GUID: 8JRHElZUXz9OTOyZaODC-rsvKCX3W2eh X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-24_04,2026-08-24_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 impostorscore=0 priorityscore=1501 adultscore=0 bulkscore=0 suspectscore=0 malwarescore=0 clxscore=1015 lowpriorityscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608240122 On Sat, 2026-08-22 at 01:15 +0100, Julian Braha wrote: > The IMA_MEASURE_PCR_IDX option is not visible for users to set, so it > always uses its default, 10. This means that the 'range 8 14' is dead > code, and the "If unsure, use the default 10" in the help text is > misleading because the user *has no other choice*. >=20 > During the first patch submission to add this option in 2008 [1], > the submitter originally gave this option a prompt: >=20 > "PCR for Aggregate (8 <=3D Index <=3D 14)" >=20 > then later removed it in the revision, without adjusting the rest of the > option accordingly [2]. >=20 > Let's clean up this of this IMA_MEASURE_PCR_IDX config option to be > consistent with its current, non-visible state. >=20 > This dead range was found by kconfirm, a static analysis tool for Kconfig= . >=20 > Signed-off-by: Julian Braha The PCR index can be specified as a Kconfig IMA_MEASURE_PCR_IDX and on individual policy records via the "pcr=3D" option. Mimi