From: Stefan Berger <stefanb@linux.ibm.com>
To: steven chen <chenste@linux.microsoft.com>,
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
Subject: Re: [PATCH v12 0/9] ima: kexec: measure events between kexec load and execute
Date: Wed, 16 Apr 2025 21:09:24 -0400 [thread overview]
Message-ID: <4a2f7fde-99ee-4bcd-a97d-fe0db418fd5f@linux.ibm.com> (raw)
In-Reply-To: <20250416021028.1403-1-chenste@linux.microsoft.com>
On 4/15/25 10:10 PM, steven chen wrote:
> From: Steven Chen <chenste@linux.microsoft.com>
>
> 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 <stefanb@linux.ibm.com> # ppc64/kvm
next prev parent reply other threads:[~2025-04-17 1:10 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-16 2:10 [PATCH v12 0/9] ima: kexec: measure events between kexec load and execute steven chen
2025-04-16 2:10 ` [PATCH v12 1/9] ima: rename variable the seq_file "file" to "ima_kexec_file" steven chen
2025-04-18 3:30 ` Baoquan He
2025-04-16 2:10 ` [PATCH v12 2/9] ima: define and call ima_alloc_kexec_file_buf() steven chen
2025-04-18 4:33 ` Baoquan He
2025-04-20 12:22 ` steven chen
2025-04-16 2:10 ` [PATCH v12 3/9] kexec: define functions to map and unmap segments steven chen
2025-04-18 4:36 ` Baoquan He
2025-04-20 12:30 ` steven chen
2025-04-21 2:09 ` Baoquan He
2025-04-21 13:51 ` Mimi Zohar
2025-04-21 14:18 ` Mimi Zohar
2025-04-21 20:40 ` steven chen
2025-04-21 21:35 ` Mimi Zohar
2025-04-21 21:44 ` steven chen
2025-04-16 2:10 ` [PATCH v12 4/9] ima: kexec: skip IMA segment validation after kexec soft reboot steven chen
2025-04-18 7:37 ` Baoquan He
2025-04-20 12:32 ` steven chen
2025-04-16 2:10 ` [PATCH v12 5/9] ima: kexec: define functions to copy IMA log at soft boot steven chen
2025-04-18 7:40 ` Baoquan He
2025-04-20 12:33 ` steven chen
2025-04-16 2:10 ` [PATCH v12 6/9] ima: kexec: move IMA log copy from kexec load to execute steven chen
2025-04-16 2:10 ` [PATCH v12 7/9] ima: verify if the segment size has changed steven chen
2025-04-16 2:10 ` [PATCH v12 8/9] ima: make the kexec extra memory configurable steven chen
2025-04-18 8:14 ` Baoquan He
2025-04-20 13:03 ` steven chen
2025-04-16 2:10 ` [PATCH v12 9/9] ima: measure kexec load and exec events as critical data steven chen
2025-04-18 9:08 ` Baoquan He
2025-04-20 13:10 ` steven chen
2025-04-17 1:09 ` Stefan Berger [this message]
2025-04-20 12:21 ` [PATCH v12 0/9] ima: kexec: measure events between kexec load and execute steven chen
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