Messages in this thread | | | From | David Laight <> | Subject | RE: Where exactly will arch_fast_hash be used | Date | Thu, 4 Dec 2014 15:56:30 +0000 |
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From: Herbert Xu > On Thu, Dec 04, 2014 at 04:43:31PM +0100, Daniel Borkmann wrote: > > > > Hm, I thought the kernel doc on arch_fast_hash() in include/linux/hash.h > > would give enough of a hint ... > > I think something more explicit like "do not use this in a hash > table unless you know what you're doing" might be needed.
That isn't really helpful. Maybe something more like:
"This CRC algorithm used by this hash is 'linear', ie hash(a xor b) == hash(a) xor hash(b). This means that it is relatively easy for a remote attacker to generate multiple items with the same hash."
David
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