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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include <string.h>
#include <algorithm>
#include <memory>
#include "base/containers/heap_array.h"
#include "components/gwp_asan/common/pack_stack_trace.h"
// Tests that whatever we give to Pack() is the same as what comes out of
// Unpack().
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* Data, size_t Size) {
if (Size < sizeof(size_t) * 2)
return 0;
size_t unpacked_max_size = reinterpret_cast<const size_t*>(Data)[0];
size_t packed_max_size = reinterpret_cast<const size_t*>(Data)[1];
Data += sizeof(size_t) * 2;
Size -= sizeof(size_t) * 2;
size_t entries = Size / sizeof(uintptr_t);
// We don't need a buffer large than Size*10 as the longest variable length
// encoding of a 64-bit integer is 10 bytes long.)
size_t packed_array_size = std::min(Size * 10, packed_max_size);
base::HeapArray<uint8_t> packed =
base::HeapArray<uint8_t>::Uninit(packed_array_size);
size_t packed_out =
gwp_asan::internal::Pack(reinterpret_cast<const uintptr_t*>(Data),
entries, packed.data(), packed_max_size);
if (packed_out > packed_array_size)
__builtin_trap();
size_t unpacked_array_size = std::min(unpacked_max_size, entries);
base::HeapArray<uintptr_t> unpacked =
base::HeapArray<uintptr_t>::Uninit(unpacked_array_size);
size_t unpacked_out = gwp_asan::internal::Unpack(
packed.data(), packed_out, unpacked.data(), unpacked_max_size);
// We can only be sure there was enough room to pack the entire input when
// packed_max_size was larger than the space allocated for packed data.
if (packed_max_size > packed_array_size &&
unpacked_out != unpacked_array_size)
__builtin_trap();
if (memcmp(Data, unpacked.data(), unpacked_out * sizeof(uintptr_t))) {
__builtin_trap();
}
return 0;
}
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