The patch titled Subject: kexec_file: fix elfcorehdr digest exclusion when CONFIG_CRASH_HOTPLUG=y has been added to the -mm mm-hotfixes-unstable branch. Its filename is kexec_file-fix-elfcorehdr-digest-exclusion-when-config_crash_hotplug=y.patch

This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...

This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------ From: Petr Tesarik ptesarik@suse.com Subject: kexec_file: fix elfcorehdr digest exclusion when CONFIG_CRASH_HOTPLUG=y Date: Mon, 5 Aug 2024 17:07:50 +0200

Fix the condition to exclude the elfcorehdr segment from the SHA digest calculation.

The j iterator is an index into the output sha_regions[] array, not into the input image->segment[] array. Once it reaches image->elfcorehdr_index, all subsequent segments are excluded. Besides, if the purgatory segment precedes the elfcorehdr segment, the elfcorehdr may be wrongly included in the calculation.

Link: https://lkml.kernel.org/r/20240805150750.170739-1-petr.tesarik@suse.com Fixes: f7cc804a9fd4 ("kexec: exclude elfcorehdr from the segment digest") Signed-off-by: Petr Tesarik ptesarik@suse.com Acked-by: Baoquan He bhe@redhat.com Cc: Eric Biederman ebiederm@xmission.com Cc: Hari Bathini hbathini@linux.ibm.com Cc: Sourabh Jain sourabhjain@linux.ibm.com Cc: Eric DeVolder eric_devolder@yahoo.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

kernel/kexec_file.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/kexec_file.c~kexec_file-fix-elfcorehdr-digest-exclusion-when-config_crash_hotplug=y +++ a/kernel/kexec_file.c @@ -752,7 +752,7 @@ static int kexec_calculate_store_digests

#ifdef CONFIG_CRASH_HOTPLUG /* Exclude elfcorehdr segment to allow future changes via hotplug */ - if (j == image->elfcorehdr_index) + if (i == image->elfcorehdr_index) continue; #endif

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Patches currently in -mm which might be from ptesarik@suse.com are

kexec_file-fix-elfcorehdr-digest-exclusion-when-config_crash_hotplug=y.patch