linux-hardening - Re: [PATCH][next] block: scsi_ioctl: Avoid the use of one-element arrays

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Message-ID: <20201003000748.GB13557@embeddedor>
Date:   Fri, 2 Oct 2020 19:07:48 -0500
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org, Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH][next] block: scsi_ioctl: Avoid the use of one-element
 arrays

On Fri, Oct 02, 2020 at 05:58:33PM -0600, Jens Axboe wrote:
> >>> -	void			__user *reserved[1];	/* unused, actually */
> >>> +	union {
> >>> +		void		__user *reserved[1];	/* unused, actually */
> >>> +		void            __user *unused;
> >>> +	};
> >>
> >> What's the point of this union, why not just turn it into
> >>
> >> 	void *			__user *unused;
> >>
> >> ?
> > 
> > I just don't want to take any chances of breaking any user-space
> > application that, for some reason, may be considering that field.
> 
> I guess that's a valid concern, who knows what applications are doing
> to an ignored field.
> 
> I'll apply it, thanks.

Awesome. :)

Thanks.
--
Gustavo