2017-08-28 16:32:36 +03:00
|
|
|
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
/*
|
|
|
|
* Purgatory code running between two kernels.
|
|
|
|
*
|
|
|
|
* Copyright IBM Corp. 2018
|
|
|
|
*
|
|
|
|
* Author(s): Philipp Rudo <prudo@linux.vnet.ibm.com>
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/kexec.h>
|
|
|
|
#include <linux/string.h>
|
2019-09-01 23:35:31 +03:00
|
|
|
#include <crypto/sha.h>
|
2017-08-28 16:32:36 +03:00
|
|
|
#include <asm/purgatory.h>
|
|
|
|
|
|
|
|
int verify_sha256_digest(void)
|
|
|
|
{
|
|
|
|
struct kexec_sha_region *ptr, *end;
|
|
|
|
u8 digest[SHA256_DIGEST_SIZE];
|
|
|
|
struct sha256_state sctx;
|
|
|
|
|
|
|
|
sha256_init(&sctx);
|
|
|
|
end = purgatory_sha_regions + ARRAY_SIZE(purgatory_sha_regions);
|
|
|
|
|
|
|
|
for (ptr = purgatory_sha_regions; ptr < end; ptr++)
|
|
|
|
sha256_update(&sctx, (uint8_t *)(ptr->start), ptr->len);
|
|
|
|
|
|
|
|
sha256_final(&sctx, digest);
|
|
|
|
|
|
|
|
if (memcmp(digest, purgatory_sha256_digest, sizeof(digest)))
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|