Hi. I was wondering about one particular feature extending namespaces functionalities: automatic namespace switching. The principle would be: a process references several namespaces. One of these namespaces is the actual namespace the process is living in. During the process lifespan, various events can cause it to automatically switch to another of its namespaces. The type of event I am especially interested in is the execve()ing of a 32bit file in the case of the x86_64 architecture: the init process creates two namespaces, one mounting a 64bit /usr and a 32bit /usr/32 (or maybe another name), the other mounting the 32bit in /usr and the 64bit in /usr/64, both sharing /home, /tmp and part of /var. When a program available only in 32bit is needed, it is exec()ed in /usr/32/bin/ (which is probably in the PATH), and that fact causes the process to switch to the 32bit namespace, where the program will find all its libraries and data at the expected place. Such a feature would require careful examination about the security implication. But I believe it may help to make the transition to pure 64bit systems (which, I fear, will be long) smoother. Does anyone have remarks about such an idea, be it to explain why it is stupid? Regards, -- Nicolas George
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