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) {}