linux-kernel - Re: [PATCH 4.19 14/48] mtd: properly check all write ioctls for permissions

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Message-ID: <20200810163851.GB24408@amd>
Date:   Mon, 10 Aug 2020 18:38:51 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        stable <stable@...nel.org>
Subject: Re: [PATCH 4.19 14/48] mtd: properly check all write ioctls for
 permissions

Hi!

> From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> 
> commit f7e6b19bc76471ba03725fe58e0c218a3d6266c3 upstream.
> 
> When doing a "write" ioctl call, properly check that we have permissions
> to do so before copying anything from userspace or anything else so we
> can "fail fast".  This includes also covering the MEMWRITE ioctl which
> previously missed checking for this.

> +	/* "safe" commands */
> +	case MEMGETREGIONCOUNT:

I wonder if MEMSETBADBLOCK, MEMLOCK/MEMUNLOCK, BLKPG, OTPLOCK and
MTDFILEMODE should be in the list of "safe" commands? Sounds like they
can do at least as much damage as average MEMWRITE...

Best regards,
								Pavel
-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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