Re: [kernel-hardening] Re: [RFC PATCH 2/2] mm: restrict access to/proc/slabinfo

[Vasiliy Kulikov]

On Mon, Sep 19, 2011 at 21:46 +0300, Pekka Enberg wrote:
> On Mon, Sep 19, 2011 at 8:58 PM, Vasiliy Kulikov <segoon@xxxxxxxxxxxx> 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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