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Re: Optimising away memset() calls?
- From: Florian Weimer <fweimer at redhat dot com>
- To: Sandy Harris <sandyinchina at gmail dot com>, gcc-help at gcc dot gnu dot org
- Date: Thu, 09 Oct 2014 12:18:02 +0200
- Subject: Re: Optimising away memset() calls?
- Authentication-results: sourceware.org; auth=none
- References: <CACXcFm=c0kf-2M2V_D+L2PdEoD4qcqKNVmPGQkv8FRKEqw3Zmw at mail dot gmail dot com>
On 10/08/2014 04:15 AM, Sandy Harris wrote:
There are various solutions to this. Linux now has memzero_explicit(),
Open SSH has bzero_explicit(), C11 has memset_s().
Minor nit: The C11 standard still allows memset_s to be optimized away
if this does not cause an observable difference in behavior (in C
terms). I know the intent is different, but this is impossible to
address within the standard, considering the direction in which the
language has developed over the last decades.
--
Florian Weimer / Red Hat Product Security