// Copyright 2018 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/debug/elf_reader_linux.h"
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#include <dlfcn.h>
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#include "base/files/memory_mapped_file.h"
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#include "base/strings/string_util.h"
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#include "build/build_config.h"
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#include "testing/gtest/include/gtest/gtest.h"
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extern char __executable_start;
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namespace base {
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namespace debug {
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// The linker flag --build-id is passed only on official builds. Clang does not
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// enable it by default and we do not have build id section in non-official
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// builds.
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#if defined(OFFICIAL_BUILD)
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TEST(ElfReaderTest, ReadElfBuildId) {
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Optional<std::string> build_id = ReadElfBuildId(&__executable_start);
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ASSERT_TRUE(build_id);
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const size_t kGuidBytes = 20;
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EXPECT_EQ(2 * kGuidBytes, build_id.value().size());
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for (char c : *build_id) {
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EXPECT_TRUE(IsHexDigit(c));
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EXPECT_FALSE(IsAsciiLower(c));
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}
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}
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#endif
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TEST(ElfReaderTest, ReadElfLibraryName) {
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#if defined(OS_ANDROID)
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// On Android the library loader memory maps the full so file.
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const char kLibraryName[] = "lib_base_unittests__library";
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const void* addr = &__executable_start;
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#else
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// On Linux the executable does not contain soname and is not mapped till
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// dynamic segment. So, use malloc wrapper so file on which the test already
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// depends on.
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const char kLibraryName[] = MALLOC_WRAPPER_LIB;
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// Find any symbol in the loaded file.
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void* handle = dlopen(kLibraryName, RTLD_NOW | RTLD_LOCAL);
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const void* init_addr = dlsym(handle, "_init");
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// Use this symbol to get full path to the loaded library.
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Dl_info info;
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int res = dladdr(init_addr, &info);
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ASSERT_NE(0, res);
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std::string filename(info.dli_fname);
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EXPECT_FALSE(filename.empty());
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EXPECT_NE(std::string::npos, filename.find(kLibraryName));
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// Memory map the so file and use it to test reading so name.
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MemoryMappedFile file;
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file.Initialize(FilePath(filename));
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const void* addr = file.data();
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#endif
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auto name = ReadElfLibraryName(addr);
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ASSERT_TRUE(name);
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EXPECT_NE(std::string::npos, name->find(kLibraryName))
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<< "Library name " << *name << " doesn't contain expected "
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<< kLibraryName;
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}
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} // namespace debug
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} // namespace base
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