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crash_dump: retrieve dm crypt keys in kdump kernel

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Crash kernel will retrieve the dm crypt keys based on the dmcryptkeys
command line parameter.  When user space writes the key description to
/sys/kernel/config/crash_dm_crypt_key/restore, the crash kernel will save
the encryption keys to the user keyring.  Then user space e.g. 
cryptsetup's --volume-key-keyring API can use it to unlock the encrypted
device.

Link: https://lkml.kernel.org/r/20250502011246.99238-6-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 09:12:39 +08:00
committed by Andrew Morton
parent 9ebfa8dcae
commit 62f17d9df6
3 changed files with 136 additions and 0 deletions
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2
include/linux/crash_dump.h
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@@ -15,6 +15,8 @@
extern unsigned long long elfcorehdr_addr;
extern unsigned long long elfcorehdr_size;
extern unsigned long long dm_crypt_keys_addr;
#ifdef CONFIG_CRASH_DUMP
extern int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size);
extern void elfcorehdr_free(unsigned long long addr);