1 // SPDX-License-Identifier: GPL-2.0-only
3 * purgatory: Runs between two kernels
5 * Copyright (C) 2014 Red Hat Inc.
8 * Vivek Goyal <vgoyal@redhat.com>
11 #include <linux/bug.h>
12 #include <crypto/sha.h>
13 #include <asm/purgatory.h>
15 #include "../boot/string.h"
17 u8 purgatory_sha256_digest
[SHA256_DIGEST_SIZE
] __section(.kexec
-purgatory
);
19 struct kexec_sha_region purgatory_sha_regions
[KEXEC_SEGMENT_MAX
] __section(.kexec
-purgatory
);
21 static int verify_sha256_digest(void)
23 struct kexec_sha_region
*ptr
, *end
;
24 u8 digest
[SHA256_DIGEST_SIZE
];
25 struct sha256_state sctx
;
28 end
= purgatory_sha_regions
+ ARRAY_SIZE(purgatory_sha_regions
);
30 for (ptr
= purgatory_sha_regions
; ptr
< end
; ptr
++)
31 sha256_update(&sctx
, (uint8_t *)(ptr
->start
), ptr
->len
);
33 sha256_final(&sctx
, digest
);
35 if (memcmp(digest
, purgatory_sha256_digest
, sizeof(digest
)))
45 ret
= verify_sha256_digest();
54 * Defined in order to reuse memcpy() and memset() from
55 * arch/x86/boot/compressed/string.c
57 void warn(const char *msg
) {}