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33 lines
733 B
33 lines
733 B
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Purgatory code running between two kernels. |
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* |
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* Copyright IBM Corp. 2018 |
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* |
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* Author(s): Philipp Rudo <[email protected]> |
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*/ |
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#include <linux/kexec.h> |
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#include <linux/string.h> |
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#include <crypto/sha2.h> |
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#include <asm/purgatory.h> |
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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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