From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4CA60C369C2 for ; Sun, 20 Apr 2025 12:21:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=S6B7H0sl7eejbWsBOT80A+X1SXdpkkOS21qiU9XGhAk=; b=kom71yAWg7kXD9GqST4k06X0nl BzNlsXSjjRKmXZht4IHcGMMGt0jI5cLZ/80Pe+ddOi5FdrAmM8cUHxkVPx3G4adUcdEHmjVRx+LDz gcfKo1KH/ofzaQcjepQsg7IL7jfP4hCQBMIHVJprf6cKAyA7HtbP8dZ89PabV9D2EuWpp57H79yvB u9ONMQ0V2LYbu67IjUwjJ1xrrS+geM2s3AAZXkXiRQGi5l11wdHtG8k9S1PeLLryusBXsP6noVksS rgtDAdQHQoqnQt8L3K2yL11y9J5rKSfeXX5Tv7n3VNHqC0mA1CdRXZhpWKfLT5fLAODIa6eGT8GGB OalQU7mg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1u6Tff-00000002XdW-4APO; Sun, 20 Apr 2025 12:21:15 +0000 Received: from linux.microsoft.com ([13.77.154.182]) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1u6TfY-00000002Xc0-2Faf for kexec@lists.infradead.org; Sun, 20 Apr 2025 12:21:12 +0000 Received: from [100.70.200.26] (unknown [20.110.218.7]) by linux.microsoft.com (Postfix) with ESMTPSA id 715EB2052525; Sun, 20 Apr 2025 05:21:04 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 715EB2052525 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1745151666; bh=S6B7H0sl7eejbWsBOT80A+X1SXdpkkOS21qiU9XGhAk=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=Sz1r5ZgH0eN5ZQZi7sPpR/CBz3lY2fwwK1tGF11xyRv9VXMM4keeCkkT+/63Xjyo6 iwy5a0ddelImoGAxwDn23U1B49quNLup2fRwlaEM8wN5rzdeSNgrYzBXwqcSfpwIZO u7S4cLaCowM7K0ri1YvGiXIdginhNQnMhGhxqKIk= Message-ID: Date: Sun, 20 Apr 2025 05:21:02 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v12 0/9] ima: kexec: measure events between kexec load and execute To: Stefan Berger , 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> <4a2f7fde-99ee-4bcd-a97d-fe0db418fd5f@linux.ibm.com> Content-Language: en-US From: steven chen In-Reply-To: <4a2f7fde-99ee-4bcd-a97d-fe0db418fd5f@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250420_052108_601860_5E388FC2 X-CRM114-Status: GOOD ( 10.61 ) X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org On 4/16/2025 6:09 PM, Stefan Berger wrote: > > > 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 Hi Stefan, Thank you very much! Steven