sandboxed-api/sandboxed_api/sandbox2/util/minielf_test.cc

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// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "sandboxed_api/sandbox2/util/minielf.h"
#include <cstdint>
#include <vector>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "sandboxed_api/sandbox2/testing.h"
#include "sandboxed_api/sandbox2/util/maps_parser.h"
#include "sandboxed_api/util/status_matchers.h"
extern "C" void ExportedFunctionName() {
// Don't do anything - used to generate a symbol.
}
namespace sandbox2 {
namespace {
using ::testing::Eq;
using ::testing::IsTrue;
using ::testing::Not;
using ::testing::StrEq;
TEST(MinielfTest, Chrome70) {
SAPI_ASSERT_OK_AND_ASSIGN(
ElfFile elf,
ElfFile::ParseFromFile(
GetTestSourcePath("sandbox2/util/testdata/chrome_grte_header"),
ElfFile::kGetInterpreter));
EXPECT_THAT(elf.interpreter(), StrEq("/usr/grte/v4/ld64"));
}
TEST(MinielfTest, SymbolResolutionWorks) {
SAPI_ASSERT_OK_AND_ASSIGN(
ElfFile elf,
ElfFile::ParseFromFile("/proc/self/exe", ElfFile::kLoadSymbols));
ASSERT_THAT(elf.position_independent(), IsTrue());
// Load /proc/self/maps to take ASLR into account.
char maps_buffer[1024 * 1024]{};
FILE *f = fopen("/proc/self/maps", "r");
ASSERT_THAT(f, Not(Eq(nullptr)));
fread(maps_buffer, 1, sizeof(maps_buffer), f);
fclose(f);
SAPI_ASSERT_OK_AND_ASSIGN(std::vector<MapsEntry> maps, ParseProcMaps(maps_buffer));
// Find maps entry that covers this entry.
uint64_t function_address = reinterpret_cast<uint64_t>(ExportedFunctionName);
bool entry_found = false;
for (const auto &entry : maps) {
if (entry.start <= function_address && entry.end > function_address) {
entry_found = true;
function_address -= entry.start;
break;
}
}
ASSERT_THAT(entry_found, IsTrue());
uint64_t exported_function_name__symbol_value = 0;
for (const auto &s : elf.symbols()) {
if (s.name == "ExportedFunctionName") {
exported_function_name__symbol_value = s.address;
break;
}
}
EXPECT_THAT(exported_function_name__symbol_value, function_address);
}
TEST(MinielfTest, ImportedLibraries) {
SAPI_ASSERT_OK_AND_ASSIGN(
ElfFile elf, ElfFile::ParseFromFile(
GetTestSourcePath("sandbox2/util/testdata/hello_world"),
ElfFile::kLoadImportedLibraries));
std::vector<std::string> imported_libraries = {"libc.so.6"};
EXPECT_THAT(elf.imported_libraries(), Eq(imported_libraries));
}
} // namespace
} // namespace sandbox2