crash_dump: store dm crypt keys in kdump reserved memory

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When the kdump kernel image and initrd are loaded, the dm crypts keys will
be read from keyring and then stored in kdump reserved memory.

Assume a key won't exceed 256 bytes thus MAX_KEY_SIZE=256 according to
"cryptsetup benchmark".

Link: https://lkml.kernel.org/r/20250502011246.99238-4-coxu@redhat.com
Signed-off-by: Coiby Xu <coxu@redhat.com>
Acked-by: Baoquan He <bhe@redhat.com>
Cc: "Daniel P. Berrange" <berrange@redhat.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Jan Pazdziora <jpazdziora@redhat.com>
Cc: Liu Pingfan <kernelfans@gmail.com>
Cc: Milan Broz <gmazyland@gmail.com>
Cc: Ondrej Kozina <okozina@redhat.com>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

...

This commit is contained in:

Coiby Xu 2025-05-02 09:12:37 +08:00 • committed by Andrew Morton

parent 180cf31af7

commit 479e58549b

3 changed files with 142 additions and 1 deletions

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6

include/linux/crash_core.h

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4

include/linux/kexec.h

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133

kernel/crash_dump_dm_crypt.c

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