From: Robin Holt <holt@sgi.com>
To: walter harms <wharms@bfs.de>
Cc: Dan Carpenter <dan.carpenter@oracle.com>,
Dimitri Sivanich <sivanich@sgi.com>, Robin Holt <holt@sgi.com>,
linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: Re: [patch] gru: info leak in gru_get_config_info()
Date: Sun, 21 Apr 2013 08:19:02 -0500 [thread overview]
Message-ID: <20130421131902.GT3658@sgi.com> (raw)
In-Reply-To: <5173D409.8010405@bfs.de>
On Sun, Apr 21, 2013 at 01:56:57PM +0200, walter harms wrote:
>
>
> Am 21.04.2013 13:10, schrieb Dan Carpenter:
> > The "info.fill" array isn't initialized so it can leak uninitialized
> > stack information to user space.
> >
> > Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> >
> > diff --git a/drivers/misc/sgi-gru/grufile.c b/drivers/misc/sgi-gru/grufile.c
> > index 44d273c..ed5fc43 100644
> > --- a/drivers/misc/sgi-gru/grufile.c
> > +++ b/drivers/misc/sgi-gru/grufile.c
> > @@ -176,6 +176,7 @@ static long gru_get_config_info(unsigned long arg)
> > info.nodes = num_online_nodes();
> > info.blades = info.nodes / nodesperblade;
> > info.chiplets = GRU_CHIPLETS_PER_BLADE * info.blades;
> > + memset(&info.fill, 0, sizeof(info.fill));
> >
>
> the other way around (clear first all bytes) looks more easy
> in case someone will add more elements to the struct.
>
> memset(&info, 0, sizeof(info));
> info.nodes = num_online_nodes();
> info.blades = info.nodes / nodesperblade;
That does seem more safe.
Robin
next prev parent reply other threads:[~2013-04-21 13:19 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-21 11:10 [patch] gru: info leak in gru_get_config_info() Dan Carpenter
2013-04-21 11:56 ` walter harms
2013-04-21 13:19 ` Robin Holt [this message]
2013-04-21 17:01 ` [patch v2] " Dan Carpenter
2013-04-21 17:33 ` Dimitri Sivanich
2013-04-22 16:41 ` Robin Holt
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