id summary reporter owner description type status milestone component version severity resolution keywords cc 7369 grow() resets permissions Aaron Wright Ion Gaztañaga "I need to create shared memory with unrestricted permissions (0666). This works fine. When I attempt to grow the shared memory, using the grow() function, the permissions get reset to 0644. I followed the code a bit and saw that it was using ftruncate. Checking the man page for ftruncate reveals, ""the set-user-ID and set-group-ID permission bits may be cleared."" Not sure what affects the ""may"" clause, but it did it every time for me. Umask was set to 0000. Obviously this only effects systems using ftruncate. Windows works correctly. Not sure on what versions may be needed, but: libc6 - 2.11.1 libglib2.0 - 2.24.1 gcc - 4.4.3" Bugs new To Be Determined interprocess Boost 1.49.0 Problem