On 2015-04-22 10:39 PM, Kenneth Adam Miller wrote: > So, I have a particular use case that has a lot to do with security. > > Basically, we have a intended secure kernel version with grsecurity and > other patches on it, and we have a specific application that has to do data > filtering as an inline reference monitor. > > The problem is, there is throughput and design considerations that are > limiting efficiency in the sense that it is highly difficult to make the > system concurrent and also highly difficult to scale-all while also being > secure. > > Basically, the memory regions have to be encoded at compile time because of > the way kernel segregation works. This makes the security proof of the > system far more simple and manageable; it's easy to say that no userland > monitor which is being given access to a specific memory region can access > outside of the region to which it is allocated, because it's statically > set. The tradeoff here is pretty severe, because the static settings that > have to be adopted pretty much mean that each particular monitor is given a > specific memory region; if there's a lot of traffic to a specific monitor > type, then that one type will be overwhelmed, but not even at the rate that > the machine itself could support. This is because all the other cores are > potentially sitting unused while the one in this worst case scenario is > running out of memory and not able to dispatch work to more cores. > > So my ultimate question is: is there some reusable, dynamic memory > allocation manager that can be used? I'm thinking that there has to, at the > least, be the constructs by which user land processes are managed and > divvied memory by the kernel itself. Does anybody know where that source > would be? Where I can go in order to learn more about that? > > What we want is a secure way to dynamically allocate memory from these > static memory page boundaries such that > > > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > You didn't finish your email such that ... . I would be glad to try and help if you finish off what your requirements are. Nick _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
