Messages in this thread | | | Date | Fri, 30 Dec 2011 11:36:55 +0400 | From | Cyrill Gorcunov <> | Subject | Re: [patch 1/4] Add routine for generating an ID for kernel pointer |
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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?
Cyrill
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