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Mon, 26 Jan 2026 22:54:08 GMT Received: from smtpav02.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C8D3758058; Mon, 26 Jan 2026 22:54:08 +0000 (GMT) Received: from smtpav02.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8BF715805C; Mon, 26 Jan 2026 22:54:07 +0000 (GMT) Received: from li-43857255-d5e6-4659-90f1-fc5cee4750ad.ibm.com (unknown [9.61.101.155]) by smtpav02.wdc07v.mail.ibm.com (Postfix) with ESMTP; Mon, 26 Jan 2026 22:54:07 +0000 (GMT) Message-ID: <87883fa611e27f8aa018e46e344846d692700402.camel@linux.ibm.com> Subject: Re: IMA and PQC From: Mimi Zohar To: David Howells Cc: Simo Sorce , Roberto Sassu , Dmitry Kasatkin , Eric Snowberg , Eric Biggers , linux-integrity@vger.kernel.org, linux-crypto@vger.kernel.org, keyrings@vger.kernel.org, linux-modules@vger.kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <1988760.1769463419@warthog.procyon.org.uk> References: <821cb2becf70b2dcb903e74685643f8b60a5cbb6.camel@linux.ibm.com> <1783975.1769190197@warthog.procyon.org.uk> <1988760.1769463419@warthog.procyon.org.uk> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Date: Mon, 26 Jan 2026 17:54:07 -0500 Precedence: bulk X-Mailing-List: linux-modules@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Evolution 3.56.2 (3.56.2-2.fc42) X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=Z4vh3XRA c=1 sm=1 tr=0 ts=6977f093 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=IkcTkHD0fZMA:10 a=vUbySO9Y5rIA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VnNF1IyMAAAA:8 a=9fkz2sjyhvhVFgQLucQA:9 a=QEXdDO2ut3YA:10 a=zgiPjhLxNE0A:10 a=zZCYzV9kfG8A:10 X-Proofpoint-GUID: og2OEGZQp4SVYi8DyDaPxzNHyV5Nw-5r X-Proofpoint-ORIG-GUID: ea4Ec5_GoT_pvcjdNgib1LdBfwGH3S0q X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTI2MDE5NSBTYWx0ZWRfXygZqNAyg1Z/3 /fseEkxemCLBzyG25XzPW5nNTIXlo8P6B4391uX0Cghr4GOPo6PH9A4ajWxsrAfs9EV6oOsJEvr FACcfXmSfml5HbVsAEcajznAnQxvWepT4A/KptDwaEF7ZQ6NXgps8NMDGnA1M6BXcJ4cK7cxzek oEGxwoz842fHim07mHFq7KpDMA00hf9lXuX5kSn/5+gilvuc2TVHOHqg7QLkJ+wMIp03oHlDSyK 0q/PN7Ww2lElNoUDV5DVzvKjbtH1FPPs105rb0e+j/1SVyTRPW9x2FFLVb+t2yJ4+/acUz+Kb7n qI4iflGzfg8d6+eUc6RgW5QcF6J28nSqsCTogMk345/qe263nqNRAoOWONRNbdluPCDQvxuy3Ap yMThs8G3uR+zVHkMWy5tkNim9leffwpsjrOOd94EnF1ZOO0p1grXsf/6dICoeGVPVNlL+gU9arM IzqajB31SifOPzr+Hyg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.20,FMLib:17.12.100.49 definitions=2026-01-26_04,2026-01-26_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 malwarescore=0 phishscore=0 priorityscore=1501 bulkscore=0 adultscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2601150000 definitions=main-2601260195 On Mon, 2026-01-26 at 21:36 +0000, David Howells wrote: > Mimi Zohar wrote: >=20 > > > Further, we need to think how we're going to do PQC support in IMA - > > > particularly as the signatures are so much bigger and verification sl= ower. > >=20 > > Perhaps, but these same reasons would apply to kernel modules, firmware= , and > > the kernel image. Why would IMA be special?! >=20 > Scale. I wouldn't expect more than a couple of hundred or so kernel modu= le > and firmware signatures - and, for the most part, that would be done once > during boot. On the other hand, I'm assuming that a lot more IMA signatu= res > might need checking and maybe more frequently. Similarly, most file signatures would be verified on boot and the results c= ached to limit the performance impact. The number of file signatures needing to = be verified is based on policy. Mimi