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7c321eb2b8
When the crashkernel kernel command line option is specified, the low 1M memory will always be reserved now. Therefore, it's not necessary to create a backup region anymore and also no need to copy the contents of the first 640k to it. Remove all the code related to handling that backup region. [ bp: Massage commit message. ] Signed-off-by: Lianbo Jiang <lijiang@redhat.com> Signed-off-by: Borislav Petkov <bp@suse.de> Cc: bhe@redhat.com Cc: Dave Young <dyoung@redhat.com> Cc: d.hatayama@fujitsu.com Cc: dhowells@redhat.com Cc: ebiederm@xmission.com Cc: horms@verge.net.au Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jürgen Gross <jgross@suse.com> Cc: kexec@lists.infradead.org Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: vgoyal@redhat.com Cc: x86-ml <x86@kernel.org> Link: https://lkml.kernel.org/r/20191108090027.11082-3-lijiang@redhat.com
58 lines
1.1 KiB
C
58 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* purgatory: Runs between two kernels
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*
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* Copyright (C) 2014 Red Hat Inc.
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*
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* Author:
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* Vivek Goyal <vgoyal@redhat.com>
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*/
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#include <linux/bug.h>
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#include <crypto/sha.h>
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#include <asm/purgatory.h>
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#include "../boot/string.h"
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u8 purgatory_sha256_digest[SHA256_DIGEST_SIZE] __section(.kexec-purgatory);
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struct kexec_sha_region purgatory_sha_regions[KEXEC_SEGMENT_MAX] __section(.kexec-purgatory);
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static 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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void purgatory(void)
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{
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int ret;
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ret = verify_sha256_digest();
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if (ret) {
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/* loop forever */
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for (;;)
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;
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}
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}
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/*
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* Defined in order to reuse memcpy() and memset() from
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* arch/x86/boot/compressed/string.c
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*/
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void warn(const char *msg) {}
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