linux-kernel - Re: [PATCH] do not try to sync identity map for non-mapped pages

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Message-ID: <20130407172545.GF31299@pd.tnic>
Date:	Sun, 7 Apr 2013 19:25:45 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	"H. Peter Anvin" <hpa@...ux.intel.com>
Cc:	Dave Hansen <dave@...1.net>, linux-kernel@...r.kernel.org,
	penguin-kernel@...ove.sakura.ne.jp, x86@...nel.org,
	akpm@...ux-foundation.org, suresh.b.siddha@...el.com,
	khlebnikov@...nvz.org, bhelgaas@...gle.com
Subject: Re: [PATCH] do not try to sync identity map for non-mapped pages

On Sun, Apr 07, 2013 at 09:34:07AM -0700, H. Peter Anvin wrote:
> We shouldn't, no. /dev/mem really needs to be fixed along a bunch of
> axes. Yes, it is privileged and extra creepy, but it should either
> work or it should fail cleanly.

Can't we filter out accesses through /dev/mem and not BUG_ON in
__phys_addr() if they come through /dev/mem? Simply fail cleanly. No
idea whether we'll break something still reading /dev/mem though.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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