40 lines
1.2 KiB
C
40 lines
1.2 KiB
C
// SPDX-License-Identifier: MIT
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/*
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* Copyright (C) 2016 The Android Open Source Project
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*/
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#include "avb_kernel_cmdline_descriptor.h"
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#include "avb_util.h"
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bool avb_kernel_cmdline_descriptor_validate_and_byteswap(
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const AvbKernelCmdlineDescriptor* src, AvbKernelCmdlineDescriptor* dest) {
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uint64_t expected_size;
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avb_memcpy(dest, src, sizeof(AvbKernelCmdlineDescriptor));
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if (!avb_descriptor_validate_and_byteswap((const AvbDescriptor*)src,
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(AvbDescriptor*)dest))
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return false;
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if (dest->parent_descriptor.tag != AVB_DESCRIPTOR_TAG_KERNEL_CMDLINE) {
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avb_error("Invalid tag for kernel cmdline descriptor.\n");
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return false;
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}
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dest->flags = avb_be32toh(dest->flags);
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dest->kernel_cmdline_length = avb_be32toh(dest->kernel_cmdline_length);
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/* Check that kernel_cmdline is fully contained. */
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expected_size = sizeof(AvbKernelCmdlineDescriptor) - sizeof(AvbDescriptor);
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if (!avb_safe_add_to(&expected_size, dest->kernel_cmdline_length)) {
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avb_error("Overflow while adding up sizes.\n");
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return false;
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}
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if (expected_size > dest->parent_descriptor.num_bytes_following) {
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avb_error("Descriptor payload size overflow.\n");
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return false;
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}
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return true;
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}
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