Re: [PATCH] sha: prevent removal of memset as dead store in sha1_update()

[Andi Kleen]

roel kluin <roel.kluin@xxxxxxxxx> writes:

>> And it's wrong because the reason the memset() is there seems to be
>> to clear out key information that might exist kernel stack so that
>> it's more difficult for rogue code to get at things.
>
> If the memset is optimized away then the clear out does not occur. Do you
> know a different way to fix this? I observed this with:

You could always cast to volatile before memsetting?

-Andi

-- 
ak@xxxxxxxxxxxxxxx -- Speaking for myself only.
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