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45 lines
1.1 KiB
45 lines
1.1 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) 2022 Huawei Technologies Co, Ltd. |
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* |
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* Author: Li Zhengyu ([email protected]) |
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* |
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*/ |
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#include <linux/purgatory.h> |
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#include <linux/kernel.h> |
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#include <linux/string.h> |
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#include <asm/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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struct sha256_state ss; |
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u8 digest[SHA256_DIGEST_SIZE]; |
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sha256_init(&ss); |
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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(&ss, (uint8_t *)(ptr->start), ptr->len); |
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sha256_final(&ss, digest); |
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if (memcmp(digest, purgatory_sha256_digest, sizeof(digest)) != 0) |
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return 1; |
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return 0; |
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} |
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/* workaround for a warning with -Wmissing-prototypes */ |
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void purgatory(void); |
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void purgatory(void) |
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{ |
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if (verify_sha256_digest()) |
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for (;;) |
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/* loop forever */ |
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; |
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}
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