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Kirill Korotaev <dev@sw.ru> writes: > Eric, > > 1. I would rename wid to wpid :) :) > 2. Maybe I'm missing something in the discussions, but why is it required? if > you provide fully isolated pid spaces, why do you care for wid? > And how ptrace can work at all if cldstop reports some pid, but child is not > accessiable via ptrace()? and if it doesn't work, what are your changes for? A good question. My pid spaces while isolated from each other are connected together in something that resembles the mount relationship when mounting a filesystem. The init process of a child pspace is visible in the parent pspace, by it's wid. So you should be able to ptrace pid == 1. The other children remain inaccessible directly. The idea was to do my very best to preserve the unix process tree when constructing a separate pid space. I have to admit I have not yet tested the ptrace corner case, or digested all of it's ramifications. Unless I have messed up somewhere it should just work. This visibility of the child tree by a single pid inside the parent tree is why I think my approach doesn't suffer from most of the problems a completely isolated pid space has. In fact I would even be willing to look at it as a global but hierarchical pid space if that proved an interesting case. So you could have something like pkill(int sig, int which, char *pid_path). Where pid_path is something like "1537/3/58", and which specified what kind of pid you are talking about (thread, pid, process group...) From a security stand point I want the option of a fully isolated group of processes, so there is a possibility of keeping secrets from the system administrator, but there is no reason that needs to be tied to a pid space. Eric - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||
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