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kexec_file: use SHA-256 library API instead of crypto_shash API

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This user of SHA-256 does not support any other algorithm, so the
crypto_shash abstraction provides no value.  Just use the SHA-256 library
API instead, which is much simpler and easier to use.

Tested with '/sbin/kexec --kexec-file-syscall'.

Link: https://lkml.kernel.org/r/20250428185721.844686-1-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Eric Biggers
2025-04-28 11:57:20 -07:00
committed by Andrew Morton
parent c91d78622e
commit f7a667a046
2 changed files with 16 additions and 65 deletions
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3
kernel/Kconfig.kexec
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@@ -38,8 +38,7 @@ config KEXEC
config KEXEC_FILE
bool "Enable kexec file based system call"
depends on ARCH_SUPPORTS_KEXEC_FILE
select CRYPTO
select CRYPTO_SHA256
select CRYPTO_LIB_SHA256
select KEXEC_CORE
help
This is new version of kexec system call. This system call is