61 lines
1.2 KiB
C
61 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* purgatory: Runs between two kernels
|
|
*
|
|
* Copyright (C) 2014 Red Hat Inc.
|
|
*
|
|
* Author:
|
|
* Vivek Goyal <vgoyal@redhat.com>
|
|
*/
|
|
|
|
#include <linux/bug.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/types.h>
|
|
#include <crypto/sha2.h>
|
|
#include <asm/purgatory.h>
|
|
|
|
#include "../boot/compressed/error.h"
|
|
#include "../boot/string.h"
|
|
|
|
u8 purgatory_sha256_digest[SHA256_DIGEST_SIZE] __section(".kexec-purgatory");
|
|
|
|
struct kexec_sha_region purgatory_sha_regions[KEXEC_SEGMENT_MAX] __section(".kexec-purgatory");
|
|
|
|
static 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;
|
|
}
|
|
|
|
void purgatory(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = verify_sha256_digest();
|
|
if (ret) {
|
|
/* loop forever */
|
|
for (;;)
|
|
;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Defined in order to reuse memcpy() and memset() from
|
|
* arch/x86/boot/compressed/string.c
|
|
*/
|
|
void warn(const char *msg) {}
|