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59 lines
1.2 KiB
59 lines
1.2 KiB
// 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 <[email protected]> |
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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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