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177b969e8c
PiperOrigin-RevId: 238996664 Change-Id: I9646527e2be68ee0b6b371572b7aafe967102e57 Signed-off-by: Christian Blichmann <cblichmann@google.com>
100 lines
3.0 KiB
C++
100 lines
3.0 KiB
C++
// Copyright 2019 Google LLC. All Rights Reserved.
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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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// http://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 <vector>
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#include "gmock/gmock.h"
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#include "gtest/gtest.h"
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#include "sandboxed_api/sandbox2/testing.h"
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#include "sandboxed_api/sandbox2/util/maps_parser.h"
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#include "sandboxed_api/util/status_matchers.h"
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using sapi::IsOk;
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using ::testing::Eq;
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using ::testing::IsTrue;
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using ::testing::Not;
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using ::testing::StrEq;
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extern "C" void ExportedFunctionName() {
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// Don't do anything - used to generate a symbol.
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}
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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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char maps_buffer[1024 * 1024]{};
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FILE *f = fopen("/proc/self/maps", "r");
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ASSERT_THAT(f, Not(Eq(nullptr)));
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fread(maps_buffer, 1, sizeof(maps_buffer), f);
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fclose(f);
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auto maps_or = ParseProcMaps(maps_buffer);
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ASSERT_THAT(maps_or.status(), IsOk());
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std::vector<MapsEntry> maps = maps_or.ValueOrDie();
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// Find maps entry that covers this entry.
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uint64_t function_address = reinterpret_cast<uint64_t>(ExportedFunctionName);
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bool entry_found = false;
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for (const auto &entry : maps) {
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if (entry.start <= function_address && entry.end > function_address) {
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entry_found = true;
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function_address -= entry.start;
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break;
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}
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}
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ASSERT_THAT(entry_found, IsTrue());
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uint64_t exported_function_name__symbol_value = 0;
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for (const auto &s : elf.symbols()) {
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if (s.name == "ExportedFunctionName") {
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exported_function_name__symbol_value = s.address;
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break;
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}
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}
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EXPECT_THAT(exported_function_name__symbol_value, 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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std::vector<std::string> imported_libraries = {"libc.so.6"};
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EXPECT_THAT(elf.imported_libraries(), Eq(imported_libraries));
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}
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} // namespace
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} // namespace sandbox2
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