david@xxxxxxx wrote: > On Sun, 10 Jun 2007, Pavel Machek wrote: >> But you have that regex in _user_ space, in a place where policy >> is loaded into kernel. > > then the kernel is going to have to call out to userspace every time a > file is created or renamed and the policy is going to be enforced > incorrectly until userspace finished labeling/relabeling whatever is > moved. building this sort of race condigion for security into the kernel > is highly questionable at best. > >> AA has regex parser in _kernel_ space, which is very wrong. > > see Linus' rants about why it's not automaticaly the best thing to move > functionality into userspace. > > remember that the files covered by an AA policy can change as files are > renamed. this isn't the case with SELinux so it doesn't have this sort > of problem. How about using the inotify interface on / to watch for file changes and updating the SELinux policies on the fly. This could be done from a userspace daemon and should require minimal SELinux changes. The only possible problems I can see are the (hopefully) small gap between the file change and updating the policy and the performance problems of watching the whole system for changes. Just my $0.02. Jack - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
