linux-kernel - Re: [PATCH v2 3/4][next] scsi: megaraid_sas: Replace one-element array with flexible-array member in MR_DRV_RAID

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Message-ID: <202206241312.EC413977@keescook>
Date:   Fri, 24 Jun 2022 13:13:10 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Kashyap Desai <kashyap.desai@...adcom.com>,
        Sumit Saxena <sumit.saxena@...adcom.com>,
        Shivasharan S <shivasharan.srikanteshwara@...adcom.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        megaraidlinux.pdl@...adcom.com, linux-scsi@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2 3/4][next] scsi: megaraid_sas: Replace one-element
 array with flexible-array member in MR_DRV_RAID_MAP

On Fri, Jun 24, 2022 at 10:48:39AM -0700, Kees Cook wrote:
> On Thu, Jun 23, 2022 at 05:38:25PM +0200, Gustavo A. R. Silva wrote:
> > Which object files are you comparing here? because I don't see the zero
> > change when comparing the before and after of megaraid_sas_fp.o with
> > the change you propose.
> 
> Hm, maybe I did something wrong. But I was looking at megaraid_sas_fp.o

Explaining my process got a bit long, so I wrote a blog post on it.
Here's how I did my examination of the resulting output:

https://outflux.net/blog/archives/2022/06/24/finding-binary-differences/

-- 
Kees Cook