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

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Date:   Thu, 04 Jun 2020 10:36:56 -0700
From:   Joe Perches <joe@...ches.com>
To:     efremov@...ux.com, Julia Lawall <Julia.Lawall@...6.fr>
Cc:     cocci@...teme.lip6.fr, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] coccinelle: api: add kzfree script

On Thu, 2020-06-04 at 20:30 +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.
> 
> Thanks, I will add memzero_explicit(). However, I can't find kvfree_sensitive().
> Is it in next already?

Yes

$ git grep kvfree_sensitive
include/linux/mm.h:extern void kvfree_sensitive(const void *addr, size_t len);
mm/util.c: * kvfree_sensitive - Free a data object containing sensitive information.
mm/util.c:void kvfree_sensitive(const void *addr, size_t len)
mm/util.c:EXPORT_SYMBOL(kvfree_sensitive);
security/keys/keyctl.c: kvfree_sensitive(payload, plen);
security/keys/keyctl.c: kvfree_sensitive(payload, plen);
security/keys/keyctl.c:                         kvfree_sensitive(key_data, key_data_len);
security/keys/keyctl.c: kvfree_sensitive(key_data, key_data_len);
security/keys/keyctl.c: kvfree_sensitive(payload, plen);