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Description: QProcess: ensure we don't accidentally execute something from CWD
Unless "." (or the empty string) is in $PATH, we're not supposed to find
executables in the current directory. This is how the Unix shells behave
and we match their behavior. It's also the behavior Qt had prior to 5.9
(commit 28666d167aa8e602c0bea25ebc4d51b55005db13). On Windows, searching
the current directory is the norm, so we keep that behavior.
.
This commit does not add an explicit check for an empty return from
QStandardPaths::findExecutable(). Instead, we allow that empty string to
go all the way to execve(2), which will fail with ENOENT. We could catch
it early, before fork(2), but why add code for the error case?
.
See https://kde.org/info/security/advisory-20220131-1.txt
Origin: upstream, https://download.qt.io/official_releases/qt/5.15/CVE-2022-25255-qprocess5-15.diff
Last-Update: 2022-02-21
Index: qtbase-opensource-src-5.15.2+dfsg/src/corelib/io/qprocess_unix.cpp
===================================================================
--- qtbase-opensource-src-5.15.2+dfsg.orig/src/corelib/io/qprocess_unix.cpp 2024-03-05 13:21:06.432881985 +0100
+++ qtbase-opensource-src-5.15.2+dfsg/src/corelib/io/qprocess_unix.cpp 2024-03-05 13:21:06.428881981 +0100
@@ -1,7 +1,7 @@
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
-** Copyright (C) 2016 Intel Corporation.
+** Copyright (C) 2022 Intel Corporation.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
@@ -422,14 +422,15 @@
// Add the program name to the argument list.
argv[0] = nullptr;
if (!program.contains(QLatin1Char('/'))) {
+ // findExecutable() returns its argument if it's an absolute path,
+ // otherwise it searches $PATH; returns empty if not found (we handle
+ // that case much later)
const QString &exeFilePath = QStandardPaths::findExecutable(program);
- if (!exeFilePath.isEmpty()) {
- const QByteArray &tmp = QFile::encodeName(exeFilePath);
- argv[0] = ::strdup(tmp.constData());
- }
- }
- if (!argv[0])
+ const QByteArray &tmp = QFile::encodeName(exeFilePath);
+ argv[0] = ::strdup(tmp.constData());
+ } else {
argv[0] = ::strdup(encodedProgramName.constData());
+ }
// Add every argument to the list
for (int i = 0; i < arguments.count(); ++i)
@@ -983,15 +984,16 @@
envp = _q_dupEnvironment(environment.d.constData()->vars, &envc);
}
- QByteArray tmp;
if (!program.contains(QLatin1Char('/'))) {
+ // findExecutable() returns its argument if it's an absolute path,
+ // otherwise it searches $PATH; returns empty if not found (we handle
+ // that case much later)
const QString &exeFilePath = QStandardPaths::findExecutable(program);
- if (!exeFilePath.isEmpty())
- tmp = QFile::encodeName(exeFilePath);
+ const QByteArray &tmp = QFile::encodeName(exeFilePath);
+ argv[0] = ::strdup(tmp.constData());
+ } else {
+ argv[0] = ::strdup(QFile::encodeName(program));
}
- if (tmp.isEmpty())
- tmp = QFile::encodeName(program);
- argv[0] = tmp.data();
if (envp)
qt_safe_execve(argv[0], argv, envp);
Index: qtbase-opensource-src-5.15.2+dfsg/tests/auto/widgets/kernel/qapplication/tst_qapplication.cpp
===================================================================
--- qtbase-opensource-src-5.15.2+dfsg.orig/tests/auto/widgets/kernel/qapplication/tst_qapplication.cpp 2024-03-05 13:21:06.432881985 +0100
+++ qtbase-opensource-src-5.15.2+dfsg/tests/auto/widgets/kernel/qapplication/tst_qapplication.cpp 2024-03-05 13:21:57.744931492 +0100
@@ -1449,7 +1449,7 @@
{
#if QT_CONFIG(process)
QProcess testProcess;
- testProcess.start("desktopsettingsaware_helper");
+ testProcess.start("./desktopsettingsaware_helper");
QVERIFY2(testProcess.waitForStarted(),
qPrintable(QString::fromLatin1("Cannot start 'desktopsettingsaware_helper': %1").arg(testProcess.errorString())));
QVERIFY(testProcess.waitForFinished(10000));
@@ -2365,7 +2365,7 @@
#if QT_CONFIG(process)
QProcess testProcess;
QStringList arguments;
- testProcess.start("modal_helper", arguments);
+ testProcess.start("./modal_helper", arguments);
QVERIFY2(testProcess.waitForStarted(),
qPrintable(QString::fromLatin1("Cannot start 'modal_helper': %1").arg(testProcess.errorString())));
QVERIFY(testProcess.waitForFinished(20000));
|
