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/****************************************************************************
**
** Copyright (C) 2017 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Milian Wolff <milian.wolff@kdab.com>
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt Enterprise Perf Profiler Add-on.
**
** GNU General Public License Usage
** This file may be used under the terms of the GNU General Public License
** version 3 as published by the Free Software Foundation and appearing in
** the file LICENSE.GPLv3 included in the packaging of this file. Please
** review the following information to ensure the GNU General Public License
** requirements will be met: https://www.gnu.org/licenses/gpl.html.
**
** If you have questions regarding the use of this file, please use
** contact form at http://www.qt.io/contact-us
**
****************************************************************************/
#include "perfkallsyms.h"
#include <QDebug>
#include <QObject>
#include <QTemporaryFile>
#include <QTest>
class TestKallsyms : public QObject
{
Q_OBJECT
private slots:
void testResolve_data()
{
QTest::addColumn<QByteArray>("kallsymsContents");
QTest::addColumn<quint64>("address");
QTest::addColumn<quint64>("expectedAddress");
QTest::addColumn<QByteArray>("expectedSymbol");
QTest::addColumn<QByteArray>("expectedModule");
QTest::addColumn<bool>("expectedFailsParse");
{
const QByteArray kallsyms =
"0000000000000000 A irq_stack_union\n"
"0000000000000000 A __per_cpu_start\n"
"ffffffff810002b8 T _stext\n"
"ffffffff81001000 T hypercall_page\n"
"ffffffff81001000 t xen_hypercall_set_trap_table\n"
"ffffffff81001020 t xen_hypercall_mmu_update\n"
"ffffffff81001040 t xen_hypercall_set_gdt\n"
"ffffffffa0000e80 T serio_interrupt\t[serio]\n"
"ffffffffa0000de0 T serio_unregister_driver\t[serio]\n";
QTest::newRow("__per_cpu_start:0") << kallsyms << 0x0ull
<< 0x0ull << QByteArray() << QByteArray() << false;
QTest::newRow("_stext:0") << kallsyms << 0xffffffff810002b8ull
<< 0xffffffff810002b8ull << QByteArrayLiteral("_stext") << QByteArray() << false;
QTest::newRow("_stext:2") << kallsyms << (0xffffffff810002b8ll + 0x2ull)
<< 0xffffffff810002b8ull << QByteArrayLiteral("_stext") << QByteArray() << false;
QTest::newRow("xen_hypercall_set_gdt:0") << kallsyms << 0xffffffff81001040ull
<< 0xffffffff81001040ull << QByteArrayLiteral("xen_hypercall_set_gdt") << QByteArray() << false;
QTest::newRow("xen_hypercall_set_gdt:256") << kallsyms << (0xffffffff81001040ull + 0x100ull)
<< 0xffffffff81001040ull << QByteArrayLiteral("xen_hypercall_set_gdt") << QByteArray() << false;
QTest::newRow("xen_hypercall_set_gdt:256") << kallsyms << (0xffffffff81001040ull + 0x100ull)
<< 0xffffffff81001040ull << QByteArrayLiteral("xen_hypercall_set_gdt") << QByteArray() << false;
QTest::newRow("serio_interrupt:0") << kallsyms << 0xffffffffa0000e80ull
<< 0xffffffffa0000e80ull << QByteArrayLiteral("serio_interrupt") << QByteArrayLiteral("[serio]") << false;
{
const auto kallsyms = QByteArrayLiteral("0000000000000000 A irq_stack_union");
QTest::newRow("zeros-only") << kallsyms << 0x0ull
<< 0x0ull << QByteArray() << QByteArray() << true;
QTest::newRow("zeros-only2") << kallsyms << std::numeric_limits<quint64>::max()
<< 0x0ull
<< QByteArray() << QByteArray() << true;
}
{
const auto kallsyms = QByteArrayLiteral(" (null) A irq_stack_union");
QTest::newRow("null-only") << kallsyms << 0x0ull
<< 0x0ull << QByteArray() << QByteArray() << true;
QTest::newRow("null-only2") << kallsyms << std::numeric_limits<quint64>::max()
<< 0x0ull
<< QByteArrayLiteral("irq_stack_union") << QByteArray() << true;
}
}
}
void testResolve()
{
QFETCH(QByteArray, kallsymsContents);
QFETCH(quint64, address);
QFETCH(quint64, expectedAddress);
QFETCH(QByteArray, expectedSymbol);
QFETCH(QByteArray, expectedModule);
QFETCH(bool, expectedFailsParse);
QTemporaryFile file;
QVERIFY(file.open());
file.write(kallsymsContents);
file.flush();
PerfKallsyms kallsyms;
QCOMPARE(kallsyms.parseMapping(file.fileName()), !expectedFailsParse);
QVERIFY(kallsyms.errorString().isEmpty() == !expectedFailsParse);
if (!expectedFailsParse) {
const auto entry = kallsyms.findEntry(address);
QCOMPARE(entry.address, expectedAddress);
QCOMPARE(entry.symbol, expectedSymbol);
QCOMPARE(entry.module, expectedModule);
}
}
void testProc()
{
const auto path = QStringLiteral("/proc/kallsyms");
if (!QFile::exists(path))
QSKIP("/proc/kallsysms not available");
auto checkSysCtl = [](const QString &knob, int expectedValue) -> bool {
QFile file(QLatin1String("/proc/sys/kernel/") + knob);
if (!file.open(QIODevice::ReadOnly)) {
qWarning() << "failed to open sysctl file for" << knob;
return false;
}
const auto contents = file.readAll().trimmed();
bool ok = false;
const auto value = contents.toInt(&ok);
if (!ok)
qWarning() << "Failed to parse sysctl file contents for" << knob << contents;
return ok && value == expectedValue;
};
if (!checkSysCtl(QStringLiteral("kptr_restrict"), 0)) {
QEXPECT_FAIL("", "sysctl kernel.kptr_restrict != 0, cannot parse /proc/kallsyms", Abort);
} else if (!checkSysCtl(QStringLiteral("perf_event_paranoid"), -1)) {
QEXPECT_FAIL("", "sysctl kernel.perf_event_paranoid != -1, cannot parse /proc/kallsyms", Abort);
}
PerfKallsyms kallsyms;
QVERIFY(kallsyms.parseMapping(path));
QVERIFY(kallsyms.errorString().isEmpty());
// just check that we find any entry
const auto addr = std::numeric_limits<quint64>::max();
const auto entry = kallsyms.findEntry(addr);
QVERIFY(!entry.symbol.isEmpty());
}
void testParseErrors()
{
QTemporaryFile file;
QVERIFY(file.open());
const auto fileName = file.fileName();
{
PerfKallsyms kallsyms;
QVERIFY(!kallsyms.parseMapping(fileName));
qDebug() << kallsyms.errorString(); // file is empty
QVERIFY(!kallsyms.errorString().isEmpty());
}
file.write("this is garbage and not a valid mapping\n");
file.flush();
{
PerfKallsyms kallsyms;
QVERIFY(!kallsyms.parseMapping(fileName));
qDebug() << kallsyms.errorString(); // invalid address
QVERIFY(!kallsyms.errorString().isEmpty());
}
QVERIFY(file.remove());
{
PerfKallsyms kallsyms;
QVERIFY(!kallsyms.parseMapping(fileName));
qDebug() << kallsyms.errorString(); // file not found
QVERIFY(!kallsyms.errorString().isEmpty());
}
}
void benchmarkProc()
{
const auto path = QStringLiteral("/proc/kallsyms");
if (!QFile::exists(path))
QSKIP("/proc/kallsysms not available");
QBENCHMARK {
PerfKallsyms kallsyms;
bool parsed = kallsyms.parseMapping(path);
Q_UNUSED(parsed);
}
}
};
QTEST_GUILESS_MAIN(TestKallsyms)
#include "tst_kallsyms.moc"
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