|From:||ebiederm-AT-xmission.com (Eric W. Biederman)|
|To:||Stephen Smalley <sds-AT-tycho.nsa.gov>|
|Subject:||Re: [Bug #11500] /proc/net bug related to selinux|
|Date:||Thu, 18 Sep 2008 11:09:31 -0700|
|Cc:||Andrew Morton <akpm-AT-linux-foundation.org>, Paul Moore <paul.moore-AT-hp.com>, jmorris-AT-namei.org, rjw-AT-sisk.pl, linux-kernel-AT-vger.kernel.org, kernel-testers-AT-vger.kernel.org, netdev-AT-vger.kernel.org|
Stephen Smalley <email@example.com> writes: > On Thu, 2008-09-18 at 08:38 -0400, Stephen Smalley wrote: >> I do however think that the mantra that we can't require users to update >> policy for kernel changes is unsupportable in general. The precise set >> of permission checks on a given operation is not set in stone and it is >> not part of the kernel/userland interface/contract. Policy isn't >> "userspace"; it governs what userspace can do, and it has to adapt to >> kernel changes. > > I should note here that for changes to SELinux, we have gone out of our > way to avoid such breakage to date through the introduction of > compatibility switches, policy flags to enable any new checks, etc > (albeit at a cost in complexity and ever creeping compatibility code). > But changes to the rest of the kernel can just as easily alter the set > of permission checks that get applied on a given operation, and I don't > think we are always going to be able to guarantee that new kernel + old > policy will Just Work. I know of at least 2 more directories that I intend to turn into symlinks into somewhere under /proc/self. How do we keep from breaking selinux policies when I do that? For comparison how do we handle sysfs? How do we handle device nodes in tmpfs? Ultimately do we want to implement xattrs and inotify on /proc? Or is there another way that would simplify maintenance? Eric -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to firstname.lastname@example.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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