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Message-ID: <20150129100431.GJ32318@port70.net>
Date: Thu, 29 Jan 2015 11:04:31 +0100
From: Szabolcs Nagy <nsz@...t70.net>
To: musl@...ts.openwall.com
Subject: Re: thoughts on reallocarray, explicit_bzero?
* Daniel Cegie??ka <daniel.cegielka@...il.com> [2015-01-29 10:30:40 +0100]:
> yet another secure_memzero(). A better solution would be to promote a
> single standard (eg. memset_s()) and the expectation that the compiler
> will respect it.
>
i think you don't know the semantics of memset_s
(it uses nonsense types, has superflous arguments, handles
constraint violations through global state etc)
it is a complicated mess and not a good api to standardize on
if all you want is to avoid information leak in crypto code
(btw no memset based solution can provide complete protection
against info leak: if the crypto function is interrupted by
a signal then all the register state will be copied to the
stack or altstack and kept around for arbitrarily long time
which is plenty information leaked)
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