Messages in this thread | | | Date | Mon, 19 Sep 2011 22:55:18 +0400 | From | Vasiliy Kulikov <> | Subject | Re: [kernel-hardening] Re: [RFC PATCH 2/2] mm: restrict access to /proc/slabinfo |
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On Mon, Sep 19, 2011 at 21:46 +0300, Pekka Enberg wrote: > On Mon, Sep 19, 2011 at 8:58 PM, Vasiliy Kulikov <segoon@openwall.com> wrote: > >> Isn't this > >> much stronger protection especially if you combine that with /proc/slabinfo > >> restriction? > > > > I don't see any reason to change allocators if we close slabinfo. > > OK, so what about /proc/meminfo, sysfs, 'perf kmem', and other kernel interfaces > through which you can get direct or indirect information about kernel memory > allocations?
Oh, we also have perf... Given these are separate interfaces, I think slab oriented restriction makes more sense.
So, now we have:
/proc/slabinfo /sys/kernel/slab /proc/meminfo 'perf kmem' - not sure what specific files should be guarded
Is there another way to get directly or indirectly the information about slabs?
Thanks,
-- Vasiliy Kulikov http://www.openwall.com - bringing security into open computing environments
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