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From: Daniel Borkmann <dborkman@redhat.com>
To: Dan Carpenter <dan.carpenter@oracle.com>
Cc: tytso@mit.edu, zatimend@hotmail.co.uk,
	linux-kernel@vger.kernel.org,
	Hannes Frederic Sowa <hannes@stressinduktion.org>,
	Alexey Dobriyan <adobriyan@gmail.com>,
	Kees Cook <keescook@chromium.org>,
	Julia Lawall <julia.lawall@lip6.fr>
Subject: Re: [PATCH] random: add and use memzero_explicit() for clearing data
Date: Mon, 01 Dec 2014 12:48:26 +0100	[thread overview]
Message-ID: <547C558A.2040401@redhat.com> (raw)
In-Reply-To: <20141201112957.GC5048@mwanda>

On 12/01/2014 12:29 PM, 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].
>>
>>    [1] https://gcc.gnu.org/ml/gcc-help/2014-10/msg00059.html
>
> We should make memset() a define and call a custom function internally.
>
> Otherwise there are thousands of calls to memset() which we would need
> to audit.  We could do some of this automatically but it's going to be a
> mess.

Sort of, yeah; for now random driver and crypto subsystem, which I consider
the main candidates, have been converted and with Julia's latest patch set
from today (via coccinelle) also remaining arch-specific crypto drivers.

      parent reply	other threads:[~2014-12-01 11:49 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-08-25 20:01 [PATCH] random: add and use memzero_explicit() for clearing data Daniel Borkmann
2014-08-25 20:35 ` Alexey Dobriyan
2014-08-25 20:38   ` Daniel Borkmann
2014-08-25 23:11 ` Hannes Frederic Sowa
2014-08-27  3:21   ` Theodore Ts'o
2014-12-01 10:27 ` Dan Carpenter
2014-12-01 11:04   ` Daniel Borkmann
2014-12-01 11:29     ` Dan Carpenter
2014-12-01 11:38       ` Dan Carpenter
2014-12-01 13:39         ` Daniel Borkmann
2014-12-01 11:48       ` Daniel Borkmann [this message]

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