linux-kernel - Re: [PATCH] x86: add phys addr validity check for /dev/mem mmap

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Message-ID: <20130402180219.GA26833@redhat.com>
Date:	Tue, 2 Apr 2013 20:02:19 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Frantisek Hrbata <fhrbata@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	x86@...nel.org, kamaleshb@...ibm.com, hechjie@...ibm.com
Subject: Re: [PATCH] x86: add phys addr validity check for /dev/mem mmap

On 04/02, Frantisek Hrbata wrote:
>
> Meaning there is a possibility to use mmap
> on /dev/mem and cause system panic. It's probably not that serious, because
> access to /dev/mem is limited and the system has to have panic_on_oops set, but
> still I think we should check this and return error.

Personally I agree. Even if panic_on_oops == F, do_page_fault(PF_RSVD) leading
to pgtable_bad() doesn't look good.

Oleg.

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