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/*
* Copyright (C) 2020 The Android Open Source Project
*
* 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 <gtest/gtest.h>
#include <android-base/test_utils.h>
#include "get_test_data.h"
#include "kallsyms.h"
#include "test_util.h"
using namespace simpleperf;
static bool ModulesMatch(const char* p, const char* q) {
if (p == nullptr && q == nullptr) {
return true;
}
if (p != nullptr && q != nullptr) {
return strcmp(p, q) == 0;
}
return false;
}
static bool KernelSymbolsMatch(const KernelSymbol& sym1, const KernelSymbol& sym2) {
return sym1.addr == sym2.addr && sym1.type == sym2.type && strcmp(sym1.name, sym2.name) == 0 &&
ModulesMatch(sym1.module, sym2.module);
}
TEST(kallsyms, ProcessKernelSymbols) {
std::string data =
"ffffffffa005c4e4 d __warned.41698 [libsas]\n"
"aaaaaaaaaaaaaaaa T _text\n"
"cccccccccccccccc c ccccc\n";
KernelSymbol expected_symbol;
expected_symbol.addr = 0xffffffffa005c4e4ULL;
expected_symbol.type = 'd';
expected_symbol.name = "__warned.41698";
expected_symbol.module = "libsas";
ASSERT_TRUE(ProcessKernelSymbols(
data, std::bind(&KernelSymbolsMatch, std::placeholders::_1, expected_symbol)));
expected_symbol.addr = 0xaaaaaaaaaaaaaaaaULL;
expected_symbol.type = 'T';
expected_symbol.name = "_text";
expected_symbol.module = nullptr;
ASSERT_TRUE(ProcessKernelSymbols(
data, std::bind(&KernelSymbolsMatch, std::placeholders::_1, expected_symbol)));
expected_symbol.name = "non_existent_symbol";
ASSERT_FALSE(ProcessKernelSymbols(
data, std::bind(&KernelSymbolsMatch, std::placeholders::_1, expected_symbol)));
}
#if defined(__ANDROID__)
TEST(kallsyms, GetKernelStartAddress) {
TEST_REQUIRE_ROOT();
ASSERT_NE(GetKernelStartAddress(), 0u);
}
TEST(kallsyms, LoadKernelSymbols) {
TEST_REQUIRE_ROOT();
std::string kallsyms;
ASSERT_TRUE(LoadKernelSymbols(&kallsyms));
}
TEST(kallsyms, print_warning) {
TEST_REQUIRE_NON_ROOT();
const std::string warning_msg = "Access to kernel symbol addresses is restricted.";
CapturedStderr capture;
// Call each function requiring kernel addresses once. Check if the warning is printed.
ResetKernelAddressWarning();
ASSERT_EQ(0, GetKernelStartAddress());
capture.Stop();
ASSERT_NE(capture.str().find(warning_msg), std::string::npos);
capture.Reset();
capture.Start();
ResetKernelAddressWarning();
std::string kallsyms;
ASSERT_FALSE(LoadKernelSymbols(&kallsyms));
capture.Stop();
ASSERT_NE(capture.str().find(warning_msg), std::string::npos);
capture.Reset();
capture.Start();
ResetKernelAddressWarning();
ASSERT_TRUE(GetLoadedModules().empty());
capture.Stop();
ASSERT_NE(capture.str().find(warning_msg), std::string::npos);
// Call functions requiring kernel addresses more than once.
// Check if the kernel address warning is only printed once.
capture.Reset();
capture.Start();
ResetKernelAddressWarning();
for (int i = 0; i < 2; i++) {
ASSERT_EQ(0, GetKernelStartAddress());
ASSERT_FALSE(LoadKernelSymbols(&kallsyms));
ASSERT_TRUE(GetLoadedModules().empty());
}
capture.Stop();
std::string output = capture.str();
auto pos = output.find(warning_msg);
ASSERT_NE(pos, std::string::npos);
ASSERT_EQ(output.find(warning_msg, pos + warning_msg.size()), std::string::npos);
}
#endif // defined(__ANDROID__)
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