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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/zucchini/disassembler_elf.h"
#include <stddef.h>
#include <stdint.h>
#include <algorithm>
#include <random>
#include <string>
#include <vector>
#include "components/zucchini/test_utils.h"
#include "components/zucchini/type_elf.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace zucchini {
TEST(DisassemblerElfTest, IsTargetOffsetInElfSectionList) {
// Minimal required fields for IsTargetOffsetInElfSectionList().
struct FakeElfShdr {
offset_t sh_offset;
offset_t sh_size;
};
// Calls IsTargetOffsetInElfSectionList() for fixed |sorted_list|, and sweeps
// offsets in [lo, hi). Renders results into a string consisting of '.' (not
// in list) and '*' (in list).
auto test = [&](const std::vector<FakeElfShdr>& sorted_list, offset_t lo,
offset_t hi) -> std::string {
// Ensure |sorted_list| is indeed sorted, without overlaps.
for (size_t i = 1; i < sorted_list.size(); ++i) {
if (sorted_list[i].sh_offset <
sorted_list[i - 1].sh_offset + sorted_list[i - 1].sh_size) {
return "(Bad input)";
}
}
// The interface to IsTargetOffsetInElfSectionList() takes a list of
// pointers (since data can be casted from images), so make the conversion.
std::vector<const FakeElfShdr*> ptr_list;
for (const FakeElfShdr& header : sorted_list)
ptr_list.push_back(&header);
std::string result;
for (offset_t offset = lo; offset < hi; ++offset) {
result += IsTargetOffsetInElfSectionList(ptr_list, offset) ? '*' : '.';
}
return result;
};
EXPECT_EQ("..........", test(std::vector<FakeElfShdr>(), 0, 10));
EXPECT_EQ("*.........", test({{0, 1}}, 0, 10));
EXPECT_EQ("...*......", test({{3, 1}}, 0, 10));
EXPECT_EQ("...****...", test({{3, 4}}, 0, 10));
EXPECT_EQ("...****...", test({{10003, 4}}, 10000, 10010));
EXPECT_EQ("...********...", test({{3, 4}, {7, 4}}, 0, 14));
EXPECT_EQ("...****.****...", test({{3, 4}, {8, 4}}, 0, 15));
EXPECT_EQ("...****..****...", test({{3, 4}, {9, 4}}, 0, 16));
EXPECT_EQ("..****...*****..", test({{2, 4}, {9, 5}}, 0, 16));
EXPECT_EQ("...***......***..", test({{3, 3}, {12, 3}}, 0, 17));
// Many small ranges.
EXPECT_EQ("..**.**.*.*...*.*.**...**.*.**.*..", // (Comment strut).
test({{2, 2},
{5, 2},
{8, 1},
{10, 1},
{14, 1},
{16, 1},
{18, 2},
{23, 2},
{26, 1},
{28, 2},
{31, 1}},
0, 34));
EXPECT_EQ("..*****.****.***.**.*..",
test({{137, 5}, {143, 4}, {148, 3}, {152, 2}, {155, 1}}, 135, 158));
// Consecutive.
EXPECT_EQ("..***************..",
test({{137, 5}, {142, 4}, {146, 3}, {149, 2}, {151, 1}}, 135, 154));
// Hover around 32 (power of 2).
EXPECT_EQ("..*******************************..",
test({{2002, 31}}, 2000, 2035));
EXPECT_EQ("..********************************..",
test({{5002, 32}}, 5000, 5036));
EXPECT_EQ("..*********************************..",
test({{8002, 33}}, 8000, 8037));
// Consecutive + small gap.
EXPECT_EQ(
"..*****************.***********..",
test({{9876543, 8}, {9876551, 9}, {9876561, 11}}, 9876541, 9876574));
// Sample internal of big range.
EXPECT_EQ("**************************************************",
test({{100, 1000000}}, 5000, 5050));
// Sample boundaries of big range.
EXPECT_EQ(".........................*************************",
test({{100, 1000000}}, 75, 125));
EXPECT_EQ("*************************.........................",
test({{100, 1000000}}, 1000075, 1000125));
// 1E9 is still good.
EXPECT_EQ(".....*.....", test({{1000000000, 1}}, 999999995, 1000000006));
}
TEST(DisassemblerElfTest, QuickDetect) {
std::vector<uint8_t> image_data;
ConstBufferView image;
// Empty.
EXPECT_FALSE(DisassemblerElfX86::QuickDetect(image));
EXPECT_FALSE(DisassemblerElfX64::QuickDetect(image));
// Unrelated.
image_data = ParseHexString("DE AD");
image = {image_data.data(), image_data.size()};
EXPECT_FALSE(DisassemblerElfX86::QuickDetect(image));
EXPECT_FALSE(DisassemblerElfX64::QuickDetect(image));
// Only Magic.
image_data = ParseHexString("7F 45 4C 46");
image = {image_data.data(), image_data.size()};
EXPECT_FALSE(DisassemblerElfX86::QuickDetect(image));
EXPECT_FALSE(DisassemblerElfX64::QuickDetect(image));
// Only identification.
image_data =
ParseHexString("7F 45 4C 46 01 01 01 00 00 00 00 00 00 00 00 00");
image = {image_data.data(), image_data.size()};
EXPECT_FALSE(DisassemblerElfX86::QuickDetect(image));
EXPECT_FALSE(DisassemblerElfX64::QuickDetect(image));
// Large enough, filled with zeros.
image_data.assign(sizeof(elf::Elf32_Ehdr), 0);
image = {image_data.data(), image_data.size()};
EXPECT_FALSE(DisassemblerElfX86::QuickDetect(image));
EXPECT_FALSE(DisassemblerElfX64::QuickDetect(image));
// Random.
std::random_device rd;
std::mt19937 gen{rd()};
std::generate(image_data.begin(), image_data.end(), gen);
image = {image_data.data(), image_data.size()};
EXPECT_FALSE(DisassemblerElfX86::QuickDetect(image));
EXPECT_FALSE(DisassemblerElfX64::QuickDetect(image));
// Typical x86 elf header.
{
elf::Elf32_Ehdr header = {};
auto e_ident =
ParseHexString("7F 45 4C 46 01 01 01 00 00 00 00 00 00 00 00 00");
std::copy(e_ident.begin(), e_ident.end(), header.e_ident);
header.e_type = elf::ET_EXEC;
header.e_machine = elf::EM_386;
header.e_version = 1;
header.e_shentsize = sizeof(elf::Elf32_Shdr);
ConstBufferView image(reinterpret_cast<const uint8_t*>(&header),
sizeof(header));
EXPECT_TRUE(DisassemblerElfX86::QuickDetect(image));
EXPECT_FALSE(DisassemblerElfX64::QuickDetect(image));
}
// Typical x64 elf header.
{
elf::Elf64_Ehdr header = {};
auto e_ident =
ParseHexString("7F 45 4C 46 02 01 01 00 00 00 00 00 00 00 00 00");
std::copy(e_ident.begin(), e_ident.end(), header.e_ident);
header.e_type = elf::ET_EXEC;
header.e_machine = elf::EM_X86_64;
header.e_version = 1;
header.e_shentsize = sizeof(elf::Elf64_Shdr);
ConstBufferView image(reinterpret_cast<const uint8_t*>(&header),
sizeof(header));
EXPECT_FALSE(DisassemblerElfX86::QuickDetect(image));
EXPECT_TRUE(DisassemblerElfX64::QuickDetect(image));
}
}
} // namespace zucchini
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