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/kexec_file-fix-elfcorehdr-digest-exclusion-when-config_crash_hotplug=y.patch
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@xxxxxxxx>
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@xxxxxxxx
Fixes: f7cc804a9fd4 ("kexec: exclude elfcorehdr from the segment digest")
Signed-off-by: Petr Tesarik <ptesarik@xxxxxxxx>
Acked-by: Baoquan He <bhe@xxxxxxxxxx>
Cc: Eric Biederman <ebiederm@xxxxxxxxxxxx>
Cc: Hari Bathini <hbathini@xxxxxxxxxxxxx>
Cc: Sourabh Jain <sourabhjain@xxxxxxxxxxxxx>
Cc: Eric DeVolder <eric_devolder@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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
_
Patches currently in -mm which might be from ptesarik@xxxxxxxx are
kexec_file-fix-elfcorehdr-digest-exclusion-when-config_crash_hotplug=y.patch
