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Thu, 17 Apr 2025 01:09:24 +0000 (GMT) Message-ID: <4a2f7fde-99ee-4bcd-a97d-fe0db418fd5f@linux.ibm.com> Date: Wed, 16 Apr 2025 21:09:24 -0400 Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v12 0/9] ima: kexec: measure events between kexec load and execute To: steven chen , zohar@linux.ibm.com, roberto.sassu@huaweicloud.com, roberto.sassu@huawei.com, eric.snowberg@oracle.com, ebiederm@xmission.com, paul@paul-moore.com, code@tyhicks.com, bauermann@kolabnow.com, linux-integrity@vger.kernel.org, kexec@lists.infradead.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org Cc: madvenka@linux.microsoft.com, nramas@linux.microsoft.com, James.Bottomley@HansenPartnership.com, bhe@redhat.com, vgoyal@redhat.com, dyoung@redhat.com References: <20250416021028.1403-1-chenste@linux.microsoft.com> Content-Language: en-US From: Stefan Berger In-Reply-To: <20250416021028.1403-1-chenste@linux.microsoft.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=Hvd2G1TS c=1 sm=1 tr=0 ts=680054c8 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=IkcTkHD0fZMA:10 a=XR8D0OoHHMoA:10 a=yMhMjlubAAAA:8 a=VnNF1IyMAAAA:8 a=KXIcZCm0EDoHl9fo71cA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-ORIG-GUID: j6fdTeznLc-rslj-Y7d3L1utxejtCVup X-Proofpoint-GUID: j6fdTeznLc-rslj-Y7d3L1utxejtCVup X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1095,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-04-16_09,2025-04-15_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 lowpriorityscore=0 spamscore=0 mlxlogscore=999 suspectscore=0 malwarescore=0 bulkscore=0 clxscore=1015 impostorscore=0 mlxscore=0 phishscore=0 priorityscore=1501 classifier=spam authscore=0 adjust=0 reason=mlx scancount=1 engine=8.19.0-2502280000 definitions=main-2504170006 On 4/15/25 10:10 PM, steven chen wrote: > From: Steven Chen > > The current kernel behavior is IMA measurements snapshot is taken at > kexec 'load' and not at kexec 'execute'. IMA log is then carried > over to the new kernel after kexec 'execute'. > > Currently, the kernel behavior during kexec load is to fetch the IMA > measurements log from TPM PCRs and store it in a buffer. When a kexec > reboot is triggered, this stored log buffer is carried over to the second > kernel. However, the time gap between kexec load and kexec reboot can be > very long. During this time window, new events extended into TPM PCRs miss > the chance to be carried over to the second kernel. This results in > mismatch between TPM PCR quotes and the actual IMA measurements list after > kexec soft reboot, which in turn results in remote attestation failure. Tested-by: Stefan Berger # ppc64/kvm