Re: [PATCH] ansi_cprng: zero out key data on exit

[Neil Horman]

On Mon, Nov 24, 2008 at 09:22:07PM +0800, Herbert Xu wrote:
> On Fri, Nov 14, 2008 at 03:55:36PM -0500, Neil Horman wrote:
> >
> > diff --git a/crypto/ansi_cprng.c b/crypto/ansi_cprng.c
> > index 72db0fd..e6ad373 100644
> > --- a/crypto/ansi_cprng.c
> > +++ b/crypto/ansi_cprng.c
> > @@ -266,6 +266,7 @@ done:
> >  static void free_prng_context(struct prng_context *ctx)
> >  {
> >  	crypto_free_cipher(ctx->tfm);
> > +	memset(ctx, 0, sizeof(struct prng_context));
> >  }
> 
> crypto_free_tfm should already handle this, no?
> 
Yep, my bad, you're right.  I was thinking since it was a pointer, we'd just
null the pointer rather than the data, but it didn't occur to me that both were
allocated contiguously, so we're good.  Patch rescinded, sorry for the noise.
Neil

> Cheers,
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 * Neil Horman <nhorman@xxxxxxxxxxxxx>
 * Software Engineer, Red Hat
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