linux-kernel - Re: [PATCH] modsign: overwrite keys with zero before deleting them

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Date:	Fri, 23 Jan 2015 23:06:54 +0100
From:	Richard Weinberger <richard.weinberger@...il.com>
To:	Alexander Holler <holler@...oftware.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	Michal Marek <mmarek@...e.cz>,
	David Howells <dhowells@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] modsign: overwrite keys with zero before deleting them

On Fri, Jan 23, 2015 at 10:57 PM, Alexander Holler <holler@...oftware.de> wrote:
> This is for the more paranoid people, also it's
> questionable what paranoid nowadays means.

Isn't this complete useless when modern filesystems like btrfs or
storage devices like SSDs are used?

> Signed-off-by: Alexander Holler <holler@...oftware.de>
> ---
>  Makefile | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/Makefile b/Makefile
> index 7ad66de..590ff53 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -1132,7 +1132,9 @@ ifeq ($(CONFIG_MODULE_SIG_THROW_AWAY), y)
>         @echo "###"
>         @echo "### Deleting key used to sign modules."
>         @echo "###"
> +       @dd status=none if=/dev/zero of=./signing_key.priv bs=4096 count=1
>         @rm ./signing_key.priv
> +       @dd status=none if=/dev/zero of=./signing_key.x509 bs=4096 count=1
>         @rm ./signing_key.x509
>  endif
>
> --
> 2.0.5
>
> --
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-- 
Thanks,
//richard
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