linux-kernel - Re: [PATCH 1/4] misc: xilinx_sdfec: Fix a couple small information leaks

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Date:   Thu, 22 Aug 2019 11:28:31 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Michal Simek <michal.simek@...inx.com>
Cc:     Derek Kiernan <derek.kiernan@...inx.com>,
        Dragan Cvetic <dragan.cvetic@...inx.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 1/4] misc: xilinx_sdfec: Fix a couple small information
 leaks

On Thu, Aug 22, 2019 at 10:14:12AM +0200, Michal Simek wrote:
> Hi Dan,
> 
> On 21. 08. 19 9:06, Dan Carpenter wrote:
> > These structs have holes in them so we end up disclosing a few bytes of
> > uninitialized stack data.
> > 
> > drivers/misc/xilinx_sdfec.c:305 xsdfec_get_status() warn: check that 'status' doesn't leak information (struct has a hole after 'activity')
> > drivers/misc/xilinx_sdfec.c:449 xsdfec_get_turbo() warn: check that 'turbo_params' doesn't leak information (struct has a hole after 'scale')
> 
> Who is generating these warnings? Is this any new GCC or different tool?
> I see that 3byte padding but never seen these warnings.

This is a Smatch check.

regards,
dan carpenter