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QStandardPaths: Don't change permissions of XDG_RUNTIME_DIR 

Conform to the XDG Base Directory Specification:
"If, when attempting to write a file, the destination directory
is non-existent an attempt should be made to create it with
permission 0700. If the destination directory exists already
the permissions should not be changed."

At the same time the spec states about XDG_RUNTIME_DIR that
"its Unix access mode MUST be 0700", so don't consider the
directory with wrong permissions correct and use a fallback.

Task-number: QTBUG-68338
Pick-to: 5.15 5.12
Change-Id: I03c6b35b3f7d5ceb8e6326695bfc8207da92ea67
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: David Faure <david.faure@kdab.com>
bb10
Alexander Volkov 2020-11-18 15:05:20 +03:00
parent d27d2b5d72
commit 68de00e0d4
2 changed files with 37 additions and 30 deletions
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59
src/corelib/io/qstandardpaths_unix.cpp
View File

@ -94,6 +94,30 @@ static QLatin1String xdg_key_name(QStandardPaths::StandardLocation type)
}
#endif
static QByteArray unixPermissionsText(QFile::Permissions permissions)
{
mode_t perms = 0;
if (permissions & QFile::ReadOwner)
perms |= S_IRUSR;
if (permissions & QFile::WriteOwner)
perms |= S_IWUSR;
if (permissions & QFile::ExeOwner)
perms |= S_IXUSR;
if (permissions & QFile::ReadGroup)
perms |= S_IRGRP;
if (permissions & QFile::WriteGroup)
perms |= S_IWGRP;
if (permissions & QFile::ExeGroup)
perms |= S_IXGRP;
if (permissions & QFile::ReadOther)
perms |= S_IROTH;
if (permissions & QFile::WriteOther)
perms |= S_IWOTH;
if (permissions & QFile::ExeOther)
perms |= S_IXOTH;
return '0' + QByteArray::number(perms, 8);
}
static bool checkXdgRuntimeDir(const QString &xdgRuntimeDir)
{
auto describeMetaData = [](const QFileSystemMetaData &metaData) -> QByteArray {
@ -113,27 +137,7 @@ static bool checkXdgRuntimeDir(const QString &xdgRuntimeDir)
else
description += "a block device";
// convert QFileSystemMetaData permissions back to Unix
mode_t perms = 0;
if (metaData.permissions() & QFile::ReadOwner)
perms |= S_IRUSR;
if (metaData.permissions() & QFile::WriteOwner)
perms |= S_IWUSR;
if (metaData.permissions() & QFile::ExeOwner)
perms |= S_IXUSR;
if (metaData.permissions() & QFile::ReadGroup)
perms |= S_IRGRP;
if (metaData.permissions() & QFile::WriteGroup)
perms |= S_IWGRP;
if (metaData.permissions() & QFile::ExeGroup)
perms |= S_IXGRP;
if (metaData.permissions() & QFile::ReadOther)
perms |= S_IROTH;
if (metaData.permissions() & QFile::WriteOther)
perms |= S_IWOTH;
if (metaData.permissions() & QFile::ExeOther)
perms |= S_IXOTH;
description += " permissions 0" + QByteArray::number(perms, 8);
description += " permissions " + unixPermissionsText(metaData.permissions());
return description
+ " owned by UID " + QByteArray::number(metaData.userId())
@ -186,14 +190,11 @@ static bool checkXdgRuntimeDir(const QString &xdgRuntimeDir)
// "and he MUST be the only one having read and write access to it. Its Unix access mode MUST be 0700."
if (metaData.permissions() != wantedPerms) {
// attempt to correct:
QSystemError error;
if (!QFileSystemEngine::setPermissions(entry, wantedPerms, error)) {
qErrnoWarning("QStandardPaths: could not set correct permissions on runtime directory "
"'%ls', which is %s", qUtf16Printable(xdgRuntimeDir),
describeMetaData(metaData).constData());
return false;
}
qWarning("QStandardPaths: wrong permissions on runtime directory %ls, %s instead of %s",
qUtf16Printable(xdgRuntimeDir),
unixPermissionsText(metaData.permissions()).constData(),
unixPermissionsText(wantedPerms).constData());
return false;
}
return true;

8
tests/auto/corelib/io/qstandardpaths/tst_qstandardpaths.cpp
View File

@ -528,7 +528,12 @@ void tst_qstandardpaths::testCustomRuntimeDirectory_data()
d.mkdir("runtime");
QFile::setPermissions(p, QFile::ReadOwner | QFile::WriteOwner | QFile::ExeOwner |
QFile::ExeGroup | QFile::ExeOther);
return updateRuntimeDir(p);
updateRuntimeDir(p);
QTest::ignoreMessage(QtWarningMsg,
QString("QStandardPaths: wrong permissions on runtime directory %1, "
"0711 instead of 0700")
.arg(p).toLatin1());
return fallbackXdgRuntimeDir();
});
addRow("environment:wrong-owner", [](QDir &) {
@ -593,6 +598,7 @@ void tst_qstandardpaths::testCustomRuntimeDirectory_data()
clearRuntimeDir();
QString p = fallbackXdgRuntimeDir();
d.mkdir(p); // probably has wrong permissions
QFile::setPermissions(p, QFile::ReadOwner | QFile::WriteOwner | QFile::ExeOwner);
return p;
});