Re: [PATCH] random: add and use memzero_explicit() for clearing data

From: Daniel Borkmann
Date: Mon Dec 01 2014 - 08:40:15 EST

On 12/01/2014 12:38 PM, Dan Carpenter wrote:
On Mon, Dec 01, 2014 at 02:29:57PM +0300, Dan Carpenter wrote:
On Mon, Dec 01, 2014 at 12:04:57PM +0100, Daniel Borkmann wrote:
Well, BSD has helpers such as bzero_explicit() for such cases to work
around this, which memzero_explicit() similarly does; see also [1].


We should make memset() a define and call a custom function internally.

Or we could specify -fno-builtin-memset like the GCC people suggest.

If there's a better, reliable way, I'm all for it. To me, memzero_explicit()
seemed like the least intrusive variant doing the job, I'm unsure if globally
setting -fno-builtin-memset will come with unforeseen side-effects on some
archs (besides performance-wise).
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