linux-kernel - Re: [PATCH v1] compiler: prevent dead store elimination

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Message-ID: <b6fcc0a1003010133w45515b17g365d42afd6407eb8@mail.gmail.com>
Date:	Mon, 1 Mar 2010 11:33:40 +0200
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Mikael Pettersson <mikpe@...uu.se>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Roel Kluin <roel.kluin@...il.com>,
	"David S. Miller" <davem@...emloft.net>, penberg@...helsinki.fi,
	Brian Gerst <brgerst@...il.com>, andi@...stfloor.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-crypto@...r.kernel.org, Herbert@...dor.apana.org.au
Subject: Re: [PATCH v1] compiler: prevent dead store elimination

On Mon, Mar 1, 2010 at 11:32 AM, Mikael Pettersson <mikpe@...uu.se> wrote:
> Arjan van de Ven writes:
>  > On Sat, 27 Feb 2010 21:47:42 +0100
>  > Roel Kluin <roel.kluin@...il.com> wrote:
>  > > +void secure_bzero(void *p, size_t n)
>  > > +{
>  > > +  memset(p, 0, n);
>  > > +  ARRAY_PREVENT_DSE(p, n);
>  > > +}
>  > > +EXPORT_SYMBOL(secure_bzero);
>  >
>  >
>  > please don't introduce bzero again to the kernel;
>  >
>  > make it secure_memset() please.

What's so secure in this function? :^)
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