[PATCH] Use memzero_explicit to clear local buffers
herbert at gondor.apana.org.au
Sun Jan 4 16:36:37 MST 2015
On Sun, Jan 04, 2015 at 11:49:09PM +0100, Giel van Schijndel wrote:
> > sctx does not point to stack memory so this is bogus.
> > Only stack memory cleared just before it goes out of scope needs
> > memzero_explicit.
> Is that because the compiler can't safely optimize memset(0) away for a
> variable with greater-than-local scope?
Exactly. memzero_explicit is not a marker for sensitive data.
Its only purpose is to prevent the compiler from optimising away
zeroing that occurs at the end of a scope.
Daniel, we should add a comment so that people stop sending bogus
patches with memzero_explicit.
Email: Herbert Xu <herbert at gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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