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Firmware images reading its own FMAP structure may have FMAP signature in code and cause dump_fmap to parse incorrectly. Since currently there is only one major version for FMAP (and the structure defined in fmap.h also applies only to current version), we can improve that by checking major version number to skip signatures in firmware code. BUG=chromium:236347 TEST=emerge vboot_reference; dump_fmap /build/daisy/firmware/image.bin # success BRANCH=none Change-Id: I1d8f49bb88357e7a3a945fbdba9d9a7c4e177ac4 Reviewed-on: https://gerrit.chromium.org/gerrit/59362 Reviewed-by: Bill Richardson <wfrichar@chromium.org> Reviewed-by: David Hendricks <dhendrix@chromium.org> Tested-by: Hung-Te Lin <hungte@chromium.org> Commit-Queue: Gabe Black <gabeblack@chromium.org>
36 lines
974 B
C
36 lines
974 B
C
/*
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* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include <stdio.h>
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#include <string.h>
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#include "fmap.h"
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const char* FmapFind(const char* ptr, size_t size)
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{
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size_t i;
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FmapHeader *fmap_header;
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for (i=0; i<size; i += FMAP_SEARCH_STRIDE, ptr += FMAP_SEARCH_STRIDE) {
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if (0 != strncmp(ptr, FMAP_SIGNATURE, FMAP_SIGNATURE_SIZE))
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continue;
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// Image may have multiple signatures (ex, in code that handles FMAP itself)
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// so we do want to check at least major version.
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fmap_header = (FmapHeader *)ptr;
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if (fmap_header->fmap_ver_major == FMAP_VER_MAJOR)
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return ptr;
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}
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return NULL;
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}
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int FmapAreaIndex(const FmapHeader* fh, const FmapAreaHeader* ah,
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const char* name) {
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int i;
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for (i = 0; i < fh->fmap_nareas; i++)
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if (!strcmp((const char*) ah[i].area_name, name))
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return i;
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return -1;
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}
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