Restrict named mutex files permissions #78106
Merged
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This change restricts the permission for files created for named mutexes that are not machine wide. Until now, all named mutexes had underlying files with access to all users. With this change, mutexes that are session local have access for the current user only. In addition to that, sticky bit is set for the /tmp/.dotnet, /tmp/.dotnet/shm directories to ensure that only creator of a file or a subdirectory can delete the respective file / subdirectory.