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From: Herbert Xu <herbert@gondor.apana.org.au>
To: Giel van Schijndel <me@mortis.eu>
Cc: linux-kernel@vger.kernel.org,
	"David S. Miller" <davem@davemloft.net>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
	"maintainer:X86 ARCHITECTURE..." <x86@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Steve French <sfrench@samba.org>,
	Rahul Bedarkar <rahulbedarkar89@gmail.com>,
	Thomas Pugliese <thomas.pugliese@gmail.com>,
	Randy Dunlap <rdunlap@infradead.org>,
	Julia Lawall <Julia.Lawall@lip6.fr>,
	"open list:CRYPTO API" <linux-crypto@vger.kernel.org>,
	"open list:CERTIFIED WIRELES..." <linux-usb@vger.kernel.org>,
	"open list:COMMON INTERNET F..." <linux-cifs@vger.kernel.org>,
	"moderated list:COMMON INTERNET F..." 
	<samba-technical@lists.samba.org>,
	Daniel Borkmann <dborkman@redhat.com>
Subject: Re: [PATCH] Use memzero_explicit to clear local buffers
Date: Wed, 7 Jan 2015 07:54:54 +1100	[thread overview]
Message-ID: <20150106205454.GA22067@gondor.apana.org.au> (raw)
In-Reply-To: <20150106194226.GM4806@salidar.dom.custoft.eu>

On Tue, Jan 06, 2015 at 08:42:26PM +0100, Giel van Schijndel wrote:
> 
> Question: are you sure the compiler won't optimize the call to memset(0)
> way if it's immediately followed by kfree()?

Yes it won't be optimised away.  However, you could use kzfree.

> Another actually does change a stack-allocated buffer, I'll split that
> one off right away.

OK.

Thanks,
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

  reply	other threads:[~2015-01-06 20:56 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-04 18:05 Giel van Schijndel
2015-01-04 21:35 ` Herbert Xu
2015-01-04 22:49   ` Giel van Schijndel
2015-01-04 23:36     ` Herbert Xu
2015-01-06 19:42       ` Giel van Schijndel
2015-01-06 20:54         ` Herbert Xu [this message]
2015-01-04 23:05 ` Giel van Schijndel
2015-01-06 21:37 ` [PATCH RESEND] cifs: use memzero_explicit to clear stack buffer Giel van Schijndel
2015-01-06 22:59   ` Herbert Xu
2015-01-13  0:12     ` Steve French
2015-01-09 18:53   ` Steve French

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