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
//
// https://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 <string>
#include <vector>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/algorithm/container.h"
#include "absl/status/statusor.h"
#include "sandboxed_api/sandbox2/util/maps_parser.h"
#include "sandboxed_api/testing.h"
#include "sandboxed_api/util/file_helpers.h"
#include "sandboxed_api/util/status_matchers.h"
extern "C" void ExportedFunction() {
// Don't do anything - used to generate a symbol.
}
namespace file = ::sapi::file;
using ::sapi::GetTestSourcePath;
using ::sapi::IsOk;
using ::testing::ElementsAre;
using ::testing::Eq;
using ::testing::IsTrue;
using ::testing::Ne;
using ::testing::StrEq;
namespace sandbox2 {
namespace {
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.
std::string maps_buffer;
ASSERT_THAT(
file::GetContents("/proc/self/maps", &maps_buffer, file::Defaults()),
IsOk());
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>(&ExportedFunction);
auto entry =
absl::c_find_if(maps, [function_address](const MapsEntry& entry) {
return entry.start <= function_address && entry.end > function_address;
});
ASSERT_THAT(entry, Ne(maps.end()));
auto function_symbol =
absl::c_find_if(elf.symbols(), [](const ElfFile::Symbol& symbol) {
return symbol.name == "ExportedFunction";
});
ASSERT_THAT(function_symbol, Ne(elf.symbols().end()));
function_address -= entry->start - entry->pgoff;
EXPECT_THAT(function_symbol->address, Eq(function_address));
}
TEST(MinielfTest, ImportedLibraries) {
SAPI_ASSERT_OK_AND_ASSIGN(
ElfFile elf, ElfFile::ParseFromFile(
GetTestSourcePath("sandbox2/util/testdata/hello_world"),
ElfFile::kLoadImportedLibraries));
EXPECT_THAT(elf.imported_libraries(), ElementsAre("libc.so.6"));
}
} // namespace
} // namespace sandbox2