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Re: [PATCHv4 0/2] tunables for glibc


On 09/07/2016 04:44 PM, H.J. Lu wrote:

The whole point of cpu features is it is initialized as early as possible
so that it can be used for ifunc.  I don't think __init_tunables is suitable
for ifunc, which doesn't have any security implications on x86.

Disabling CPU features for crypto acceleration may introduce timing attacks and information leakage (especially if the fallback implementation uses lookup tables).

(It's not relevant for glibc at present, I think.)

Florian


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