touch-packages team mailing list archive

[Zsombor Egri <1359831@xxxxxxxxxxxxxxxxxx>]

This looks like the problem of using QStandardPaths::writableLocation().

The relevant code snipped from QStandardPaths::writableLocation(RuntimeLocation):
       // "and he MUST be the only one having read and write access to it. Its Unix access mode MUST be 0700."
        QFile file(xdgRuntimeDir);
        const QFile::Permissions wantedPerms = QFile::ReadUser | QFile::WriteUser | QFile::ExeUser;
        if (file.permissions() != wantedPerms && !file.setPermissions(wantedPerms)) {
            qWarning("QStandardPaths: wrong permissions on runtime directory %s", qPrintable(xdgRuntimeDir));
            return QString();
        }

where QFile::permissions() drills down to ask for permissions using
QFileSystemMetaData::doStat(). This seems to cause the chmod issue we
have.

Not sure whether the failure described in this bug is caused by the
Toolkit's StateSaver services, but in case bug #1363112 fix solves this
issue, it can be marked as resolved. In StateSaver we have similar
issues as here, so at least I suspect the root cause is the same as we
have in the other bug.

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https://bugs.launchpad.net/bugs/1359831

Title:
  Apps incorrectly perform a chmod on XDG_RUNTIME_DIR

Status in Camera App:
  Confirmed
Status in Ubuntu Reminders app:
  Invalid
Status in Sudoku game for Ubuntu Touch:
  Invalid
Status in “qtbase-opensource-src” package in Ubuntu:
  Confirmed

Bug description:
  From bug #1351041:
  [Thu Jul 31 21:04:20 2014] type=1400 audit(1406837062.464:97): apparmor="DENIED" operation="chmod" profile="com.ubuntu.reminders_reminders_0.5.203" name="/run/user/32011/" pid=12954 comm="reminders" requested_mask="w" denied_mask="w" fsuid=32011 ouid=32011

  From irc:
  Aug 21 15:47:20 ubuntu-phablet kernel: [  251.843308] type=1400 audit(1408636040.346:137): apparmor="DENIED" operation="chmod" profile="com.ubuntu.camera_camera_3.0.0.355" name="/run/user/32011/" pid=4172 comm="camera-app" requested_mask="w" denied_mask="w" fsuid=32011 ouid=32011

  AppArmor policy is correct on this denial-- apps should not be able to
  change the permissions on the /run/user/32011/ (XDG_RUNTIME_DIR)
  directory. I filed this against camera-app and reminders, but my guess
  is this is an underlying library that is causing this. I don't know if
  the denial is causing errors with the app, but it is causing confusion
  for users and developers who see the denial.

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