| // Copyright 2017 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/rel32_finder.h" |
| |
| #include <stddef.h> |
| #include <stdint.h> |
| |
| #include <algorithm> |
| #include <iterator> |
| #include <string> |
| #include <utility> |
| #include <vector> |
| |
| #include "base/format_macros.h" |
| #include "base/logging.h" |
| #include "base/strings/stringprintf.h" |
| #include "components/zucchini/buffer_view.h" |
| #include "components/zucchini/image_utils.h" |
| #include "testing/gtest/include/gtest/gtest.h" |
| |
| namespace zucchini { |
| |
| TEST(Abs32GapFinderTest, All) { |
| const size_t kRegionTotal = 99; |
| std::vector<uint8_t> buffer(kRegionTotal); |
| ConstBufferView image(buffer.data(), buffer.size()); |
| |
| // Common test code that returns the resulting segments as a string. |
| auto run_test = [&](size_t rlo, size_t rhi, |
| std::vector<offset_t> abs32_locations, |
| std::ptrdiff_t abs32_width) -> std::string { |
| CHECK_LE(rlo, kRegionTotal); |
| CHECK_LE(rhi, kRegionTotal); |
| CHECK(std::is_sorted(abs32_locations.begin(), abs32_locations.end())); |
| CHECK_GT(abs32_width, 0); |
| ConstBufferView region = |
| ConstBufferView::FromRange(image.begin() + rlo, image.begin() + rhi); |
| Abs32GapFinder gap_finder(image, region, abs32_locations, abs32_width); |
| |
| std::string out_str; |
| for (auto gap = gap_finder.GetNext(); gap; gap = gap_finder.GetNext()) { |
| size_t lo = static_cast<size_t>(gap->begin() - image.begin()); |
| size_t hi = static_cast<size_t>(gap->end() - image.begin()); |
| out_str.append(base::StringPrintf("[%" PRIuS ",%" PRIuS ")", lo, hi)); |
| } |
| return out_str; |
| }; |
| |
| // Empty regions yield empty segments. |
| EXPECT_EQ("", run_test(0, 0, std::vector<offset_t>(), 4)); |
| EXPECT_EQ("", run_test(9, 9, std::vector<offset_t>(), 4)); |
| EXPECT_EQ("", run_test(8, 8, {8}, 4)); |
| EXPECT_EQ("", run_test(8, 8, {0, 12}, 4)); |
| |
| // If no abs32 locations exist then the segment is the main range. |
| EXPECT_EQ("[0,99)", run_test(0, 99, std::vector<offset_t>(), 4)); |
| EXPECT_EQ("[20,21)", run_test(20, 21, std::vector<offset_t>(), 4)); |
| EXPECT_EQ("[51,55)", run_test(51, 55, std::vector<offset_t>(), 4)); |
| |
| // abs32 locations found near start of main range. |
| EXPECT_EQ("[10,20)", run_test(10, 20, {5}, 4)); |
| EXPECT_EQ("[10,20)", run_test(10, 20, {6}, 4)); |
| EXPECT_EQ("[11,20)", run_test(10, 20, {7}, 4)); |
| EXPECT_EQ("[12,20)", run_test(10, 20, {8}, 4)); |
| EXPECT_EQ("[13,20)", run_test(10, 20, {9}, 4)); |
| EXPECT_EQ("[14,20)", run_test(10, 20, {10}, 4)); |
| EXPECT_EQ("[10,11)[15,20)", run_test(10, 20, {11}, 4)); |
| |
| // abs32 locations found near end of main range. |
| EXPECT_EQ("[10,15)[19,20)", run_test(10, 20, {15}, 4)); |
| EXPECT_EQ("[10,16)", run_test(10, 20, {16}, 4)); |
| EXPECT_EQ("[10,17)", run_test(10, 20, {17}, 4)); |
| EXPECT_EQ("[10,18)", run_test(10, 20, {18}, 4)); |
| EXPECT_EQ("[10,19)", run_test(10, 20, {19}, 4)); |
| EXPECT_EQ("[10,20)", run_test(10, 20, {20}, 4)); |
| EXPECT_EQ("[10,20)", run_test(10, 20, {21}, 4)); |
| |
| // Main range completely eclipsed by abs32 location. |
| EXPECT_EQ("", run_test(10, 11, {7}, 4)); |
| EXPECT_EQ("", run_test(10, 11, {8}, 4)); |
| EXPECT_EQ("", run_test(10, 11, {9}, 4)); |
| EXPECT_EQ("", run_test(10, 11, {10}, 4)); |
| EXPECT_EQ("", run_test(10, 12, {8}, 4)); |
| EXPECT_EQ("", run_test(10, 12, {9}, 4)); |
| EXPECT_EQ("", run_test(10, 12, {10}, 4)); |
| EXPECT_EQ("", run_test(10, 13, {9}, 4)); |
| EXPECT_EQ("", run_test(10, 13, {10}, 4)); |
| EXPECT_EQ("", run_test(10, 14, {10}, 4)); |
| EXPECT_EQ("", run_test(10, 14, {8, 12}, 4)); |
| |
| // Partial eclipses. |
| EXPECT_EQ("[24,25)", run_test(20, 25, {20}, 4)); |
| EXPECT_EQ("[20,21)", run_test(20, 25, {21}, 4)); |
| EXPECT_EQ("[20,21)[25,26)", run_test(20, 26, {21}, 4)); |
| |
| // abs32 location outside main range. |
| EXPECT_EQ("[40,60)", run_test(40, 60, {36, 60}, 4)); |
| EXPECT_EQ("[41,61)", run_test(41, 61, {0, 10, 20, 30, 34, 62, 68, 80}, 4)); |
| |
| // Change abs32 width. |
| EXPECT_EQ("[10,11)[12,14)[16,19)", run_test(10, 20, {9, 11, 14, 15, 19}, 1)); |
| EXPECT_EQ("", run_test(10, 11, {10}, 1)); |
| EXPECT_EQ("[18,23)[29,31)", run_test(17, 31, {15, 23, 26, 31}, 3)); |
| EXPECT_EQ("[17,22)[25,26)[29,30)", run_test(17, 31, {14, 22, 26, 30}, 3)); |
| EXPECT_EQ("[10,11)[19,20)", run_test(10, 20, {11}, 8)); |
| |
| // Mixed cases with abs32 width = 4. |
| EXPECT_EQ("[10,15)[19,20)[24,25)", run_test(8, 25, {2, 6, 15, 20, 27}, 4)); |
| EXPECT_EQ("[0,25)[29,45)[49,50)", run_test(0, 50, {25, 45}, 4)); |
| EXPECT_EQ("[10,20)[28,50)", run_test(10, 50, {20, 24}, 4)); |
| EXPECT_EQ("[49,50)[54,60)[64,70)[74,80)[84,87)", |
| run_test(49, 87, {10, 20, 30, 40, 50, 60, 70, 80, 90}, 4)); |
| EXPECT_EQ("[0,10)[14,20)[24,25)[29,50)", run_test(0, 50, {10, 20, 25}, 4)); |
| } |
| |
| namespace { |
| |
| // A mock Rel32Finder to inject next search result on Scan(). |
| class TestRel32Finder : public Rel32Finder { |
| public: |
| using Rel32Finder::Rel32Finder; |
| |
| bool GetNext() { return Rel32Finder::FindNext(); } |
| |
| // Rel32Finder: |
| ConstBufferView Scan(ConstBufferView region) override { return next_result; } |
| |
| ConstBufferView next_result; |
| }; |
| |
| } // namespace |
| |
| TEST(Rel32FinderTest, Scan) { |
| const size_t kRegionTotal = 99; |
| std::vector<uint8_t> buffer(kRegionTotal); |
| ConstBufferView image(buffer.data(), buffer.size()); |
| |
| TestRel32Finder finder(image); |
| |
| auto check_finder_state = [&](const TestRel32Finder& finder, |
| size_t expected_cursor, |
| size_t expected_next_cursor) { |
| CHECK_LE(expected_cursor, kRegionTotal); |
| CHECK_LE(expected_next_cursor, kRegionTotal); |
| |
| EXPECT_EQ(image.begin() + expected_cursor, finder.region().begin()); |
| EXPECT_EQ(image.begin() + expected_next_cursor, finder.next_cursor()); |
| }; |
| |
| check_finder_state(finder, 0, 0); |
| |
| finder.next_result = ConstBufferView(image.begin() + 0, 1); |
| EXPECT_TRUE(finder.GetNext()); |
| check_finder_state(finder, 1, 1); |
| |
| finder.next_result = ConstBufferView(image.begin() + 1, 1); |
| EXPECT_TRUE(finder.GetNext()); |
| check_finder_state(finder, 2, 2); |
| |
| finder.next_result = ConstBufferView(image.begin() + 4, 2); |
| EXPECT_TRUE(finder.GetNext()); |
| check_finder_state(finder, 5, 6); |
| finder.Accept(); |
| check_finder_state(finder, 6, 6); |
| |
| finder.next_result = ConstBufferView(image.begin() + 6, 1); |
| EXPECT_TRUE(finder.GetNext()); |
| check_finder_state(finder, 7, 7); |
| |
| finder.next_result = ConstBufferView(image.begin() + 7, 1); |
| EXPECT_TRUE(finder.GetNext()); |
| check_finder_state(finder, 8, 8); |
| |
| finder.next_result = ConstBufferView(image.begin() + 98, 1); |
| EXPECT_TRUE(finder.GetNext()); |
| check_finder_state(finder, 99, 99); |
| |
| finder.next_result = ConstBufferView(image.end(), 0); |
| EXPECT_FALSE(finder.GetNext()); |
| check_finder_state(finder, 99, 99); |
| } |
| |
| TEST(Rel32FinderX86Test, FindNext) { |
| constexpr uint8_t data[] = { |
| 0x55, // 00: push ebp |
| 0x8B, 0xEC, // 01: mov ebp,esp |
| 0xE8, 0x00, 0x00, 0x00, 0x00, // 03: call 08 |
| 0xE9, 0x00, 0x00, 0x00, 0x00, // 08: jmp 0D |
| 0x0F, 0x80, 0x00, 0x00, 0x00, 0x00, // 0D: jo 13 |
| 0x0F, 0x81, 0x00, 0x00, 0x00, 0x00, // 13: jno 19 |
| 0x0F, 0x82, 0x00, 0x00, 0x00, 0x00, // 19: jb 1F |
| 0x0F, 0x83, 0x00, 0x00, 0x00, 0x00, // 1F: jae 25 |
| 0x0F, 0x84, 0x00, 0x00, 0x00, 0x00, // 25: je 2B |
| 0x0F, 0x85, 0x00, 0x00, 0x00, 0x00, // 2B: jne 31 |
| 0x0F, 0x86, 0x00, 0x00, 0x00, 0x00, // 31: jbe 37 |
| 0x0F, 0x87, 0x00, 0x00, 0x00, 0x00, // 37: ja 3D |
| 0x0F, 0x88, 0x00, 0x00, 0x00, 0x00, // 3D: js 43 |
| 0x0F, 0x89, 0x00, 0x00, 0x00, 0x00, // 43: jns 49 |
| 0x0F, 0x8A, 0x00, 0x00, 0x00, 0x00, // 49: jp 4F |
| 0x0F, 0x8B, 0x00, 0x00, 0x00, 0x00, // 4F: jnp 55 |
| 0x0F, 0x8C, 0x00, 0x00, 0x00, 0x00, // 55: jl 5B |
| 0x0F, 0x8D, 0x00, 0x00, 0x00, 0x00, // 5B: jge 61 |
| 0x0F, 0x8E, 0x00, 0x00, 0x00, 0x00, // 61: jle 67 |
| 0x0F, 0x8F, 0x00, 0x00, 0x00, 0x00, // 67: jg 6D |
| 0x5D, // 6D: pop ebp |
| 0xC3, // C3: ret |
| }; |
| |
| ConstBufferView image = |
| ConstBufferView::FromRange(std::begin(data), std::end(data)); |
| |
| Rel32FinderX86 rel_finder(image); |
| |
| // List of expected locations as pairs of (cursor position, rel32 position). |
| std::vector<std::pair<size_t, size_t>> expected_locations = { |
| {0x04, 0x04}, {0x09, 0x09}, {0x0E, 0x0F}, {0x14, 0x15}, {0x1A, 0x1B}, |
| {0x20, 0x21}, {0x26, 0x27}, {0x2C, 0x2D}, {0x32, 0x33}, {0x38, 0x39}, |
| {0x3E, 0x3F}, {0x44, 0x45}, {0x4A, 0x4B}, {0x50, 0x51}, {0x56, 0x57}, |
| {0x5C, 0x5D}, {0x62, 0x63}, {0x68, 0x69}, |
| }; |
| |
| for (auto location : expected_locations) { |
| auto result = rel_finder.GetNext(); |
| EXPECT_TRUE(result.has_value()); |
| |
| EXPECT_EQ(location.first, |
| size_t(rel_finder.region().begin() - image.begin())); |
| EXPECT_EQ(location.second, size_t(result->location - image.begin())); |
| EXPECT_EQ(result->location + 4, rel_finder.next_cursor()); |
| EXPECT_FALSE(result->can_point_outside_section); |
| rel_finder.Accept(); |
| } |
| EXPECT_EQ(base::nullopt, rel_finder.GetNext()); |
| } |
| |
| TEST(Rel32FinderX86Test, Accept) { |
| constexpr uint8_t data[] = { |
| 0xB9, 0x00, 0x00, 0x00, 0xE9, // 00: mov E9000000 |
| 0xE8, 0x00, 0x00, 0x00, 0xE9, // 05: call E900000A |
| 0xE8, 0x00, 0x00, 0x00, 0xE9, // 0A: call E900000F |
| }; |
| |
| ConstBufferView image = |
| ConstBufferView::FromRange(std::begin(data), std::end(data)); |
| |
| auto next_location = [&](Rel32FinderX86& rel_finder) { |
| auto result = rel_finder.GetNext(); |
| EXPECT_TRUE(result.has_value()); |
| return result->location - image.begin(); |
| }; |
| |
| Rel32FinderX86 rel_finder(image); |
| |
| EXPECT_EQ(0x05, next_location(rel_finder)); // False positive. |
| rel_finder.Accept(); |
| // False negative: shadowed by 0x05 |
| // EXPECT_EQ(0x06, next_location(rel_finder)); |
| EXPECT_EQ(0x0A, next_location(rel_finder)); // False positive. |
| EXPECT_EQ(0x0B, next_location(rel_finder)); // Found if 0x0A is discarded. |
| } |
| |
| TEST(Rel32FinderX64Test, FindNext) { |
| constexpr uint8_t data[] = { |
| 0x55, // 00: push ebp |
| 0x8B, 0xEC, // 01: mov ebp,esp |
| 0xE8, 0x00, 0x00, 0x00, 0x00, // 03: call 08 |
| 0xE9, 0x00, 0x00, 0x00, 0x00, // 08: jmp 0D |
| 0x0F, 0x80, 0x00, 0x00, 0x00, 0x00, // 0D: jo 13 |
| 0x0F, 0x81, 0x00, 0x00, 0x00, 0x00, // 13: jno 19 |
| 0x0F, 0x82, 0x00, 0x00, 0x00, 0x00, // 19: jb 1F |
| 0x0F, 0x83, 0x00, 0x00, 0x00, 0x00, // 1F: jae 25 |
| 0x0F, 0x84, 0x00, 0x00, 0x00, 0x00, // 25: je 2B |
| 0x0F, 0x85, 0x00, 0x00, 0x00, 0x00, // 2B: jne 31 |
| 0x0F, 0x86, 0x00, 0x00, 0x00, 0x00, // 31: jbe 37 |
| 0x0F, 0x87, 0x00, 0x00, 0x00, 0x00, // 37: ja 3D |
| 0x0F, 0x88, 0x00, 0x00, 0x00, 0x00, // 3D: js 43 |
| 0x0F, 0x89, 0x00, 0x00, 0x00, 0x00, // 43: jns 49 |
| 0x0F, 0x8A, 0x00, 0x00, 0x00, 0x00, // 49: jp 4F |
| 0x0F, 0x8B, 0x00, 0x00, 0x00, 0x00, // 4F: jnp 55 |
| 0x0F, 0x8C, 0x00, 0x00, 0x00, 0x00, // 55: jl 5B |
| 0x0F, 0x8D, 0x00, 0x00, 0x00, 0x00, // 5B: jge 61 |
| 0x0F, 0x8E, 0x00, 0x00, 0x00, 0x00, // 61: jle 67 |
| 0x0F, 0x8F, 0x00, 0x00, 0x00, 0x00, // 67: jg 6F |
| 0xFF, 0x15, 0x00, 0x00, 0x00, 0x00, // 6D: call [rip+00] |
| 0xFF, 0x25, 0x00, 0x00, 0x00, 0x00, // 73: jmp [rip+00] |
| 0x8B, 0x05, 0x00, 0x00, 0x00, 0x00, // 79: mov eax,[rip+00] |
| 0x8B, 0x3D, 0x00, 0x00, 0x00, 0x00, // 7F: mov edi,[rip+00] |
| 0x8D, 0x05, 0x00, 0x00, 0x00, 0x00, // 85: lea eax,[rip+00] |
| 0x8D, 0x3D, 0x00, 0x00, 0x00, 0x00, // 8B: lea edi,[rip+00] |
| 0x48, 0x8B, 0x05, 0x00, 0x00, 0x00, 0x00, // 91: mov rax,[rip+00] |
| 0x48, 0x8B, 0x3D, 0x00, 0x00, 0x00, 0x00, // 98: mov rdi,[rip+00] |
| 0x48, 0x8D, 0x05, 0x00, 0x00, 0x00, 0x00, // 9F: lea rax,[rip+00] |
| 0x48, 0x8D, 0x3D, 0x00, 0x00, 0x00, 0x00, // A6: lea rdi,[rip+00] |
| 0x4C, 0x8B, 0x05, 0x00, 0x00, 0x00, 0x00, // AD: mov r8,[rip+00] |
| 0x4C, 0x8B, 0x3D, 0x00, 0x00, 0x00, 0x00, // B4: mov r15,[rip+00] |
| 0x4C, 0x8D, 0x05, 0x00, 0x00, 0x00, 0x00, // BB: lea r8,[rip+00] |
| 0x4C, 0x8D, 0x3D, 0x00, 0x00, 0x00, 0x00, // C2: lea r15,[rip+00] |
| 0x66, 0x8B, 0x05, 0x00, 0x00, 0x00, 0x00, // C9: mov ax,[rip+00] |
| 0x66, 0x8B, 0x3D, 0x00, 0x00, 0x00, 0x00, // D0: mov di,[rip+00] |
| 0x66, 0x8D, 0x05, 0x00, 0x00, 0x00, 0x00, // D7: lea ax,[rip+00] |
| 0x66, 0x8D, 0x3D, 0x00, 0x00, 0x00, 0x00, // DE: lea di,[rip+00] |
| 0x5D, // E5: pop ebp |
| 0xC3, // E6: ret |
| }; |
| |
| ConstBufferView image = |
| ConstBufferView::FromRange(std::begin(data), std::end(data)); |
| |
| Rel32FinderX64 rel_finder(image); |
| |
| // Lists of expected locations as pairs of (cursor position, rel32 position). |
| std::vector<std::pair<size_t, size_t>> expected_locations = { |
| {0x04, 0x04}, {0x09, 0x09}, {0x0E, 0x0F}, {0x14, 0x15}, {0x1A, 0x1B}, |
| {0x20, 0x21}, {0x26, 0x27}, {0x2C, 0x2D}, {0x32, 0x33}, {0x38, 0x39}, |
| {0x3E, 0x3F}, {0x44, 0x45}, {0x4A, 0x4B}, {0x50, 0x51}, {0x56, 0x57}, |
| {0x5C, 0x5D}, {0x62, 0x63}, {0x68, 0x69}, |
| }; |
| std::vector<std::pair<size_t, size_t>> expected_locations_rip = { |
| {0x6E, 0x6F}, {0x74, 0x75}, {0x7A, 0x7B}, {0x80, 0x81}, {0x86, 0x87}, |
| {0x8C, 0x8D}, {0x93, 0x94}, {0x9A, 0x9B}, {0xA1, 0xA2}, {0xA8, 0xA9}, |
| {0xAF, 0xB0}, {0xB6, 0xB7}, {0xBD, 0xBE}, {0xC4, 0xC5}, {0xCB, 0xCC}, |
| {0xD2, 0xD3}, {0xD9, 0xDA}, {0xE0, 0xE1}, |
| }; |
| for (auto location : expected_locations) { |
| auto result = rel_finder.GetNext(); |
| EXPECT_TRUE(result.has_value()); |
| |
| EXPECT_EQ(location.first, |
| size_t(rel_finder.region().begin() - image.begin())); |
| EXPECT_EQ(location.second, size_t(result->location - image.begin())); |
| EXPECT_EQ(result->location + 4, rel_finder.next_cursor()); |
| EXPECT_FALSE(result->can_point_outside_section); |
| rel_finder.Accept(); |
| } |
| for (auto location : expected_locations_rip) { |
| auto result = rel_finder.GetNext(); |
| EXPECT_TRUE(result.has_value()); |
| |
| EXPECT_EQ(location.first, |
| size_t(rel_finder.region().begin() - image.begin())); |
| EXPECT_EQ(location.second, size_t(result->location - image.begin())); |
| EXPECT_EQ(result->location + 4, rel_finder.next_cursor()); |
| EXPECT_TRUE(result->can_point_outside_section); |
| rel_finder.Accept(); |
| } |
| EXPECT_EQ(base::nullopt, rel_finder.GetNext()); |
| } |
| |
| // TODO(huangs): Test that integrates Abs32GapFinder and Rel32Finder. |
| |
| } // namespace zucchini |
