60 lines
1.2 KiB
C
60 lines
1.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* purgatory: Runs between two kernels
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*
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* Copyright (C) 2014 Red Hat Inc.
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*
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* Author:
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* Vivek Goyal <vgoyal@redhat.com>
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*/
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#include <linux/bug.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <crypto/sha2.h>
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#include <asm/purgatory.h>
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#include "../boot/string.h"
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u8 purgatory_sha256_digest[SHA256_DIGEST_SIZE] __section(".kexec-purgatory");
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struct kexec_sha_region purgatory_sha_regions[KEXEC_SEGMENT_MAX] __section(".kexec-purgatory");
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static int verify_sha256_digest(void)
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{
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struct kexec_sha_region *ptr, *end;
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u8 digest[SHA256_DIGEST_SIZE];
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struct sha256_state sctx;
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sha256_init(&sctx);
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end = purgatory_sha_regions + ARRAY_SIZE(purgatory_sha_regions);
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for (ptr = purgatory_sha_regions; ptr < end; ptr++)
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sha256_update(&sctx, (uint8_t *)(ptr->start), ptr->len);
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sha256_final(&sctx, digest);
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if (memcmp(digest, purgatory_sha256_digest, sizeof(digest)))
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return 1;
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return 0;
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}
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void purgatory(void)
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{
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int ret;
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ret = verify_sha256_digest();
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if (ret) {
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/* loop forever */
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for (;;)
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;
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}
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}
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/*
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* Defined in order to reuse memcpy() and memset() from
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* arch/x86/boot/compressed/string.c
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*/
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void warn(const char *msg) {}
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