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//===-- sanitizer_procmaps_mac_test.cpp ---------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is a part of ThreadSanitizer/AddressSanitizer runtime.
//
//===----------------------------------------------------------------------===//
# include "sanitizer_common/sanitizer_platform.h"
# if SANITIZER_APPLE
# include <stdlib.h>
# include <string.h>
# include <stdint.h>
# include <stdio.h>
# include <vector>
# include <mach-o/dyld.h>
# include <mach-o/loader.h>
# include "gtest/gtest.h"
# include "sanitizer_common/sanitizer_procmaps.h"
namespace __sanitizer {
class MemoryMappingLayoutMock final : public MemoryMappingLayout {
private:
static constexpr uuid_command mock_uuid_command = {
.cmd = LC_UUID,
.cmdsize = sizeof(uuid_command),
.uuid = {}
};
static constexpr char libclang_rt_dylib_name[] =
"libclang_rt.\0\0\0"; // 8 bytes aligned, padded with zeros per loader.h
static constexpr char uninstrumented_dylib_name[] =
"uninst___rt.\0\0\0"; // 8 bytes aligned, padded with zeros per loader.h
static constexpr dylib_command mock_dylib_command = {
.cmd = LC_LOAD_DYLIB,
.cmdsize = sizeof(dylib_command) + sizeof(libclang_rt_dylib_name),
.dylib = {.name = {.offset = sizeof(dylib_command)}}};
static constexpr uuid_command mock_trap_command = {
.cmd = LC_UUID,
.cmdsize = 0x10000,
.uuid = {}
};
const char *start_load_cmd_addr;
size_t sizeofcmds;
std::vector<unsigned char> mock_header;
public:
MemoryMappingLayoutMock(bool instrumented) : MemoryMappingLayout(false) {
EXPECT_EQ(mock_uuid_command.cmdsize % 8, 0u);
EXPECT_EQ(mock_dylib_command.cmdsize % 8, 0u);
Reset();
# ifdef MH_MAGIC_64
const struct mach_header_64 *header =
(mach_header_64 *)_dyld_get_image_header(0); // Any header will do
const size_t header_size = sizeof(mach_header_64);
# else
const struct mach_header *header = _dyld_get_image_header(0);
const size_t header_size = sizeof(mach_header);
# endif
const size_t mock_header_size_with_extras =
header_size + header->sizeofcmds + mock_uuid_command.cmdsize +
mock_dylib_command.cmdsize + sizeof(uuid_command);
mock_header.reserve(mock_header_size_with_extras);
// Copy the original header
copy((unsigned char *)header,
(unsigned char *)header + header_size + header->sizeofcmds,
back_inserter(mock_header));
// The following commands are not supposed to be processed
// by the (correct) ::Next method at all, since they're not
// accounted for in header->ncmds .
copy((unsigned char *)&mock_uuid_command,
((unsigned char *)&mock_uuid_command) + mock_uuid_command.cmdsize,
back_inserter(mock_header));
copy((unsigned char *)&mock_dylib_command,
((unsigned char *)&mock_dylib_command) +
sizeof(dylib_command), // as mock_dylib_command.cmdsize contains
// the following string
back_inserter(mock_header));
const char(&dylib_name)[16] =
instrumented ? libclang_rt_dylib_name : uninstrumented_dylib_name;
copy((unsigned char *)dylib_name,
((unsigned char *)dylib_name) + sizeof(dylib_name),
back_inserter(mock_header));
// Append a command w. huge size to have the test detect the read overrun
copy((unsigned char *)&mock_trap_command,
((unsigned char *)&mock_trap_command) + sizeof(uuid_command),
back_inserter(mock_header));
start_load_cmd_addr = (const char *)(mock_header.data() + header_size);
sizeofcmds = header->sizeofcmds;
const char *last_byte_load_cmd_addr = (start_load_cmd_addr + sizeofcmds - 1);
data_.current_image = -1; // So the loop in ::Next runs just once
}
size_t SizeOfLoadCommands() {
return sizeofcmds;
}
size_t CurrentLoadCommandOffset() {
size_t offset = data_.current_load_cmd_addr - start_load_cmd_addr;
return offset;
}
protected:
virtual ImageHeader *CurrentImageHeader() override {
return (ImageHeader *)mock_header.data();
}
};
TEST(MemoryMappingLayout, NextInstrumented) {
__sanitizer::MemoryMappingLayoutMock memory_mapping(true);
__sanitizer::MemoryMappedSegment segment;
size_t size = memory_mapping.SizeOfLoadCommands();
while (memory_mapping.Next(&segment)) {
size_t offset = memory_mapping.CurrentLoadCommandOffset();
EXPECT_LE(offset, size);
}
size_t final_offset = memory_mapping.CurrentLoadCommandOffset();
EXPECT_EQ(final_offset, size); // All commands processed, no more, no less
}
TEST(MemoryMappingLayout, NextUnInstrumented) {
__sanitizer::MemoryMappingLayoutMock memory_mapping(false);
__sanitizer::MemoryMappedSegment segment;
size_t size = memory_mapping.SizeOfLoadCommands();
while (memory_mapping.Next(&segment)) {
size_t offset = memory_mapping.CurrentLoadCommandOffset();
EXPECT_LE(offset, size);
}
size_t final_offset = memory_mapping.CurrentLoadCommandOffset();
EXPECT_EQ(final_offset, size); // All commands processed, no more, no less
}
} // namespace __sanitizer
# endif // SANITIZER_APPLE
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