[Boost-bugs] [Boost C++ Libraries] #9321: named mutex permissions are not reset after application crash

Subject: [Boost-bugs] [Boost C++ Libraries] #9321: named mutex permissions are not reset after application crash
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2013-10-30 12:08:25

#9321: named mutex permissions are not reset after application crash
-------------------------------------------------+-------------------------
 Reporter:  Marcus Ackermann                     |      Owner:  igaztanaga
  <Marcus.Ackermann@…>                           |     Status:  new
     Type:  Bugs                                 |  Component:
Milestone:  To Be Determined                     |  interprocess
  Version:  Boost 1.50.0                         |   Severity:  Problem
 Keywords:                                       |
-------------------------------------------------+-------------------------
 '''Using boost named_mutex on Windows with the standard permissions
 object.'''

 An application creates a named mutex and removes it on exit. This works
 fine even if the application is started by different users one after the
 other.

 Now assume the application crashes and does not call remove, anymore. When
 a different user starts the same application later on, the named mutex
 cannot be created and throws an interprocess exception "access denied".

 This is due to the fact that the mutex file in the folder
 {{{c:\ProgramData\boost_interprocess}}} still exists, and it has the
 permissions of the user that started the application first.

 '''How to reproduce'''

 The following simple application simulates a crash by exiting before
 removing the mutex.

 Run the application as user x. The mutex is successfully constructed, the
 application crashes unexpectedly.

 Then run the application as user y. The mutex cannot be constructed as
 file {{{c:\ProgramData\boost_interprocess\my_mutex_name}}} is still
 present and cannot be opened by user y although user x who owns the file
 does not use it by any process.

 {{{
 #include "boost/interprocess/sync/named_mutex.hpp"

 int main(const int argc, const char* const * const argv)
 {
     try
     {
         boost::interprocess::named_mutex
 mutex(boost::interprocess::open_or_create, "my_mutex_name");

         printf("mutex construction successful\n");
     }
     catch (const boost::interprocess::interprocess_exception& ex)
     {
         printf("mutex construction failed: %s\n", ex.what());
     }

     exit(0);

     boost::interprocess::named_mutex::remove("my_mutex_name");

     return 0;
 }
 }}}

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/9321>
Boost C++ Libraries <http://www.boost.org/>
Boost provides free peer-reviewed portable C++ source libraries.