linux-kernel - Re: [PATCH] coccinelle: api: add kzfree script

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Message-ID: <20200615120332.GJ4282@kadam>
Date:   Mon, 15 Jun 2020 15:03:32 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Denis Efremov <efremov@...ux.com>
Cc:     Joe Perches <joe@...ches.com>, Julia Lawall <Julia.Lawall@...6.fr>,
        cocci@...teme.lip6.fr, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] coccinelle: api: add kzfree script

On Sun, Jun 14, 2020 at 10:42:54PM +0300, Denis Efremov wrote:
> On 6/4/20 7:27 PM, Joe Perches wrote:
> > On Thu, 2020-06-04 at 17:08 +0300, Denis Efremov wrote:
> >> Check for memset() with 0 followed by kfree().
> > 
> > Perhaps those uses should be memzero_explicit or kvfree_sensitive.
> > 
> 
> Is it safe to suggest to use kzfree instead of memzero_explicit && kfree?
> Or it would be better to use kvfree_sensitive in this case.
> 
> kzfree uses memset(0) with no barrier_data.

Yeah.  That seems buggy.  It should have a barrier.  Also I thought I
saw somewhere that Linus doesn't like the name and so that's why we have
the _sensitive() name?

regards,
dan carpenter