mirror of
https://github.com/google/sandboxed-api.git
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97 lines
3.1 KiB
C++
97 lines
3.1 KiB
C++
// Copyright 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "sandboxed_api/sandbox2/util/minielf.h"
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#include <cstdint>
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#include <string>
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#include <vector>
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#include "gmock/gmock.h"
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#include "gtest/gtest.h"
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#include "absl/algorithm/container.h"
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#include "absl/status/statusor.h"
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#include "sandboxed_api/sandbox2/util/maps_parser.h"
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#include "sandboxed_api/testing.h"
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#include "sandboxed_api/util/file_helpers.h"
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#include "sandboxed_api/util/status_matchers.h"
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extern "C" void ExportedFunction() {
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// Don't do anything - used to generate a symbol.
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}
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namespace file = ::sapi::file;
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using ::sapi::GetTestSourcePath;
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using ::sapi::IsOk;
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using ::testing::ElementsAre;
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using ::testing::Eq;
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using ::testing::IsTrue;
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using ::testing::Ne;
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using ::testing::StrEq;
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namespace sandbox2 {
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namespace {
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TEST(MinielfTest, Chrome70) {
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SAPI_ASSERT_OK_AND_ASSIGN(
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ElfFile elf,
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ElfFile::ParseFromFile(
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GetTestSourcePath("sandbox2/util/testdata/chrome_grte_header"),
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ElfFile::kGetInterpreter));
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EXPECT_THAT(elf.interpreter(), StrEq("/usr/grte/v4/ld64"));
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}
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TEST(MinielfTest, SymbolResolutionWorks) {
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SAPI_ASSERT_OK_AND_ASSIGN(
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ElfFile elf,
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ElfFile::ParseFromFile("/proc/self/exe", ElfFile::kLoadSymbols));
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ASSERT_THAT(elf.position_independent(), IsTrue());
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// Load /proc/self/maps to take ASLR into account.
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std::string maps_buffer;
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ASSERT_THAT(
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file::GetContents("/proc/self/maps", &maps_buffer, file::Defaults()),
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IsOk());
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SAPI_ASSERT_OK_AND_ASSIGN(std::vector<MapsEntry> maps,
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ParseProcMaps(maps_buffer));
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// Find maps entry that covers this entry.
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uint64_t function_address = reinterpret_cast<uint64_t>(&ExportedFunction);
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auto entry =
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absl::c_find_if(maps, [function_address](const MapsEntry& entry) {
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return entry.start <= function_address && entry.end > function_address;
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});
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ASSERT_THAT(entry, Ne(maps.end()));
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auto function_symbol =
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absl::c_find_if(elf.symbols(), [](const ElfFile::Symbol& symbol) {
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return symbol.name == "ExportedFunction";
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});
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ASSERT_THAT(function_symbol, Ne(elf.symbols().end()));
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function_address -= entry->start - entry->pgoff;
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EXPECT_THAT(function_symbol->address, Eq(function_address));
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}
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TEST(MinielfTest, ImportedLibraries) {
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SAPI_ASSERT_OK_AND_ASSIGN(
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ElfFile elf, ElfFile::ParseFromFile(
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GetTestSourcePath("sandbox2/util/testdata/hello_world"),
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ElfFile::kLoadImportedLibraries));
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EXPECT_THAT(elf.imported_libraries(), ElementsAre("libc.so.6"));
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}
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} // namespace
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} // namespace sandbox2
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