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I just understand somewhat about what's the purpose of shared memory which is for faster exchange or use of data among several programs. But having seen a lot of people trying to or talking about secure it, I dont understand how it could be dangerous & what could be done to secure it ?

I am asking this in context of configuring a server environment on a VPS.

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It can be dangerous if the program creating it is written wrong and sets up the permissions so that other users can attach to it. You secure it by writing the program properly to restrict the permissions to only that user. As such this isn't an administration problem.

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