Re: [patch 1/4] Add routine for generating an ID for kernel pointer

From: Cyrill Gorcunov
Date: Fri Dec 30 2011 - 02:37:39 EST

On Fri, Dec 30, 2011 at 11:23:09AM +1100, Herbert Xu wrote:
> On Thu, Dec 29, 2011 at 08:24:53PM +0400, Cyrill Gorcunov wrote:
> >
> > Probably I've had to crypto_alloc_hash earlier and simply keep a reference
> > to algo but since I'm not sure if looking for modules in late-init-call
> > is good idea.
> Right, the allocation needs to occur in a sleepable context.
> If you're just hashing something small and have no need for
> hardware acceleration then lib/sha1.c is fine.

Hi, yeah, it's just one message block hashing so I've switched
to lib/sha1.c. Herbert, I'm more interested in security analysis
-- would the sha1(msg), where the 'msg' is the kernel pointer
XOR'ed with random value and expanded to the 512 bits would be
safe enough for export to unprivilege users?

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