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| 1 | +//===-- sanitizer_procmaps_mac_test.cpp ---------------------------------------===// |
| 2 | +// |
| 3 | +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | +// See https://llvm.org/LICENSE.txt for license information. |
| 5 | +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | +// |
| 7 | +//===----------------------------------------------------------------------===// |
| 8 | +// |
| 9 | +// This file is a part of ThreadSanitizer/AddressSanitizer runtime. |
| 10 | +// |
| 11 | +//===----------------------------------------------------------------------===// |
| 12 | + |
| 13 | +# include "sanitizer_common/sanitizer_platform.h" |
| 14 | + |
| 15 | +# if SANITIZER_APPLE |
| 16 | + |
| 17 | +# include <stdlib.h> |
| 18 | +# include <string.h> |
| 19 | +# include <stdint.h> |
| 20 | +# include <stdio.h> |
| 21 | + |
| 22 | +# include <vector> |
| 23 | +# include <mach-o/dyld.h> |
| 24 | +# include <mach-o/loader.h> |
| 25 | + |
| 26 | +# include "gtest/gtest.h" |
| 27 | + |
| 28 | +# include "sanitizer_common/sanitizer_procmaps.h" |
| 29 | + |
| 30 | +namespace __sanitizer { |
| 31 | + |
| 32 | +class MemoryMappingLayoutMock final : public MemoryMappingLayout { |
| 33 | +private: |
| 34 | + static constexpr uuid_command mock_uuid_command = { |
| 35 | + .cmd = LC_UUID, |
| 36 | + .cmdsize = sizeof(uuid_command), |
| 37 | + .uuid = {} |
| 38 | + }; |
| 39 | + |
| 40 | + static constexpr char dylib_name[] = "libclang_rt.\0\0\0"; // 8 bytes aligned, padded with zeros per loader.h |
| 41 | + static constexpr dylib_command mock_dylib_command = { |
| 42 | + .cmd = LC_LOAD_DYLIB, |
| 43 | + .cmdsize = sizeof(dylib_command) + sizeof(dylib_name), |
| 44 | + .dylib = { |
| 45 | + .name = { |
| 46 | + .offset = sizeof(dylib_command) |
| 47 | + } |
| 48 | + } |
| 49 | + }; |
| 50 | + |
| 51 | + static constexpr uuid_command mock_trap_command = { |
| 52 | + .cmd = LC_UUID, |
| 53 | + .cmdsize = 0x10000, |
| 54 | + .uuid = {} |
| 55 | + }; |
| 56 | + |
| 57 | + const char *start_load_cmd_addr; |
| 58 | + size_t sizeofcmds; |
| 59 | + std::vector<unsigned char> mock_header; |
| 60 | + |
| 61 | +public: |
| 62 | + MemoryMappingLayoutMock(): MemoryMappingLayout(false) { |
| 63 | + EXPECT_EQ(mock_uuid_command.cmdsize % 8, 0u); |
| 64 | + EXPECT_EQ(mock_dylib_command.cmdsize % 8, 0u); |
| 65 | + |
| 66 | + Reset(); |
| 67 | + |
| 68 | +#ifdef MH_MAGIC_64 |
| 69 | + const struct mach_header_64 *header = (mach_header_64 *)_dyld_get_image_header(0); // Any header will do |
| 70 | + const size_t header_size = sizeof(mach_header_64); |
| 71 | +#else |
| 72 | + const struct mach_header *header = _dyld_get_image_header(0); |
| 73 | + const size_t header_size = sizeof(mach_header); |
| 74 | +#endif |
| 75 | + const size_t mock_header_size_with_extras = header_size + header->sizeofcmds + |
| 76 | + mock_uuid_command.cmdsize + mock_dylib_command.cmdsize + sizeof(uuid_command); |
| 77 | + |
| 78 | + mock_header.reserve(mock_header_size_with_extras); |
| 79 | + // Copy the original header |
| 80 | + copy((unsigned char *)header, |
| 81 | + (unsigned char *)header + header_size + header->sizeofcmds, |
| 82 | + back_inserter(mock_header)); |
| 83 | + // The following commands are not supposed to be processed |
| 84 | + // by the (correct) ::Next method at all, since they're not |
| 85 | + // accounted for in header->ncmds . |
| 86 | + copy((unsigned char *)&mock_uuid_command, |
| 87 | + ((unsigned char *)&mock_uuid_command) + mock_uuid_command.cmdsize, |
| 88 | + back_inserter(mock_header)); |
| 89 | + copy((unsigned char *)&mock_dylib_command, |
| 90 | + ((unsigned char *)&mock_dylib_command) + sizeof(dylib_command), // as mock_dylib_command.cmdsize contains the following string |
| 91 | + back_inserter(mock_header)); |
| 92 | + copy((unsigned char *)dylib_name, |
| 93 | + ((unsigned char *)dylib_name) + sizeof(dylib_name), |
| 94 | + back_inserter(mock_header)); |
| 95 | + |
| 96 | + // Append a command w. huge size to have the test detect the read overrun |
| 97 | + copy((unsigned char *)&mock_trap_command, |
| 98 | + ((unsigned char *)&mock_trap_command) + sizeof(uuid_command), |
| 99 | + back_inserter(mock_header)); |
| 100 | + |
| 101 | + start_load_cmd_addr = (const char *)(mock_header.data() + header_size); |
| 102 | + sizeofcmds = header->sizeofcmds; |
| 103 | + |
| 104 | + const char *last_byte_load_cmd_addr = (start_load_cmd_addr+sizeofcmds-1); |
| 105 | + data_.current_image = -1; // So the loop in ::Next runs just once |
| 106 | + } |
| 107 | + |
| 108 | + size_t SizeOfLoadCommands() { |
| 109 | + return sizeofcmds; |
| 110 | + } |
| 111 | + |
| 112 | + size_t CurrentLoadCommandOffset() { |
| 113 | + size_t offset = data_.current_load_cmd_addr - start_load_cmd_addr; |
| 114 | + return offset; |
| 115 | + } |
| 116 | + |
| 117 | +protected: |
| 118 | + virtual ImageHeader *CurrentImageHeader() override { |
| 119 | + return (ImageHeader *)mock_header.data(); |
| 120 | + } |
| 121 | +}; |
| 122 | + |
| 123 | +TEST(MemoryMappingLayout, Next) { |
| 124 | + __sanitizer::MemoryMappingLayoutMock memory_mapping; |
| 125 | + __sanitizer::MemoryMappedSegment segment; |
| 126 | + size_t size = memory_mapping.SizeOfLoadCommands(); |
| 127 | + while (memory_mapping.Next(&segment)) { |
| 128 | + size_t offset = memory_mapping.CurrentLoadCommandOffset(); |
| 129 | + EXPECT_LE(offset, size); |
| 130 | + } |
| 131 | + size_t final_offset = memory_mapping.CurrentLoadCommandOffset(); |
| 132 | + EXPECT_EQ(final_offset, size); // All commands processed, no more, no less |
| 133 | +} |
| 134 | + |
| 135 | +} // namespace __sanitizer |
| 136 | + |
| 137 | +# endif // SANITIZER_APPLE |
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