Kroah-Hartman: AF_BUS, D-Bus, and the Linux kernel
Kroah-Hartman: AF_BUS, D-Bus, and the Linux kernel
Posted Feb 14, 2013 17:27 UTC (Thu) by raven667 (subscriber, #5198)In reply to: Kroah-Hartman: AF_BUS, D-Bus, and the Linux kernel by brouhaha
Parent article: Kroah-Hartman: AF_BUS, D-Bus, and the Linux kernel
> That's a bizarre argument. Having code in user space doesn't magically make it less trustworthy than the same code would be in kernel space. Whether particular code should be trusted is a matter of policy, and there are various mechanism for policy enforcement.
Sure it does, the kernel has no control over what is run in user space and can make no assumptions about it being the "same code" or some expected implementation, it can have zero trust that the data given to it from userspace isn't bogus and absolutely must check everything. This is different than a closed environment like an appliance where one entity has control of both userspace and kernelspace, maybe restrictions could be relaxed in that case.