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Message-ID: <c9516f27-ad4c-5b65-1611-f0c3604168bf@intel.com>
Date: Tue, 14 Nov 2017 16:37:34 -0800
From: Dave Hansen <dave.hansen@...el.com>
To: Tycho Andersen <tycho@...ho.ws>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
kernel-hardening@...ts.openwall.com,
Marco Benatto <marco.antonio.780@...il.com>,
Juerg Haefliger <juerg.haefliger@...onical.com>, x86@...nel.org
Subject: Re: Re: [PATCH v6 03/11] mm, x86: Add support for
eXclusive Page Frame Ownership (XPFO)
On 11/14/2017 04:33 PM, Tycho Andersen wrote:
>>
>> void set_bh_page(struct buffer_head *bh,
>> ...
>> bh->b_data = page_address(page) + offset;
> Ah, yes. I guess there will be many bugs like this :). Anyway, I'll
> try to cook up a patch.
It won't catch all the bugs, but it might be handy to have a debugging
mode that records the location of the last user of page_address() and
friends. That way, when we trip over an unmapped page, we have an
easier time finding the offender.
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