mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 16:38:12 +00:00
a24d22b225
Currently <crypto/sha.h> contains declarations for both SHA-1 and SHA-2, and <crypto/sha3.h> contains declarations for SHA-3. This organization is inconsistent, but more importantly SHA-1 is no longer considered to be cryptographically secure. So to the extent possible, SHA-1 shouldn't be grouped together with any of the other SHA versions, and usage of it should be phased out. Therefore, split <crypto/sha.h> into two headers <crypto/sha1.h> and <crypto/sha2.h>, and make everyone explicitly specify whether they want the declarations for SHA-1, SHA-2, or both. This avoids making the SHA-1 declarations visible to files that don't want anything to do with SHA-1. It also prepares for potentially moving sha1.h into a new insecure/ or dangerous/ directory. Signed-off-by: Eric Biggers <ebiggers@google.com> Acked-by: Ard Biesheuvel <ardb@kernel.org> Acked-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
57 lines
1.1 KiB
C
57 lines
1.1 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 <crypto/sha2.h>
|
|
#include <asm/purgatory.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) {}
|