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b=qqJe0mhdUhAQpnOpFxzwnQ6Ilx6eUAHTExafUWtKgiYYT5aCRqOQs7y75RHALHE6RM08CsFOx54KWyRZ0xDsEkFD8rZ8PrGoqQ9s8mp85khA4AX50vslGuqHZas+GxHyWWm550oxsCGJMk4/+2VE/ehieqQ4hmMnBIqBriVriuk= Received: from CO1PR10MB4531.namprd10.prod.outlook.com (2603:10b6:303:6c::22) by IA1PR10MB7200.namprd10.prod.outlook.com (2603:10b6:208:3f7::16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6521.21; Thu, 29 Jun 2023 19:21:41 +0000 Received: from CO1PR10MB4531.namprd10.prod.outlook.com ([fe80::8b8f:b4b1:bb78:b048]) by CO1PR10MB4531.namprd10.prod.outlook.com ([fe80::8b8f:b4b1:bb78:b048%5]) with mapi id 15.20.6521.024; Thu, 29 Jun 2023 19:21:41 +0000 From: Eric DeVolder To: linux-kernel@vger.kernel.org, david@redhat.com, osalvador@suse.de, corbet@lwn.net, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, bhe@redhat.com, ebiederm@xmission.com, kexec@lists.infradead.org Cc: hpa@zytor.com, gregkh@linuxfoundation.org, rafael@kernel.org, vgoyal@redhat.com, dyoung@redhat.com, lf32.dev@gmail.com, akpm@linux-foundation.org, naveen.n.rao@linux.vnet.ibm.com, zohar@linux.ibm.com, bhelgaas@google.com, vbabka@suse.cz, tiwai@suse.de, seanjc@google.com, linux@weissschuh.net, vschneid@redhat.com, linux-mm@kvack.org, linux-doc@vger.kernel.org, sourabhjain@linux.ibm.com, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, eric.devolder@oracle.com Subject: [PATCH v25 05/10] kexec: exclude elfcorehdr from the segment digest Date: Thu, 29 Jun 2023 15:21:14 -0400 Message-Id: <20230629192119.6613-6-eric.devolder@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230629192119.6613-1-eric.devolder@oracle.com> References: <20230629192119.6613-1-eric.devolder@oracle.com> X-ClientProxiedBy: DS7PR06CA0019.namprd06.prod.outlook.com (2603:10b6:8:2a::18) To CO1PR10MB4531.namprd10.prod.outlook.com (2603:10b6:303:6c::22) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: 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( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230629_122229_656433_312A1096 X-CRM114-Status: GOOD ( 19.30 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org When a crash kernel is loaded via the kexec_file_load() syscall, the kernel places the various segments (ie crash kernel, crash initrd, boot_params, elfcorehdr, purgatory, etc) in memory. For those architectures that utilize purgatory, a hash digest of the segments is calculated for integrity checking. The digest is embedded into the purgatory image prior to placing in memory. Updates to the elfcorehdr in response to CPU and memory changes would cause the purgatory integrity checking to fail (at crash time, and no vmcore created). Therefore, the elfcorehdr segment is explicitly excluded from the purgatory digest, enabling updates to the elfcorehdr while also avoiding the need to recompute the hash digest and reload purgatory. Signed-off-by: Eric DeVolder Reviewed-by: Sourabh Jain Acked-by: Hari Bathini Acked-by: Baoquan He --- kernel/kexec_file.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c index e9cf9e8d8f01..824ffc5282f4 100644 --- a/kernel/kexec_file.c +++ b/kernel/kexec_file.c @@ -726,6 +726,12 @@ static int kexec_calculate_store_digests(struct kimage *image) for (j = i = 0; i < image->nr_segments; i++) { struct kexec_segment *ksegment; +#ifdef CONFIG_CRASH_HOTPLUG + /* Exclude elfcorehdr segment to allow future changes via hotplug */ + if (j == image->elfcorehdr_index) + continue; +#endif + ksegment = &image->segment[i]; /* * Skip purgatory as it will be modified once we put digest -- 2.31.1 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec