linux-kernel - Re: [PATCH] fix CONFIG_IO_STRICT_DEVMEM, do not enable by default

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Message-ID: <CAPcyv4jq86AKYjoDbLuV-Yy4K0oYAafOEYMwQ_Yg4sOfkdTLoQ@mail.gmail.com>
Date:	Wed, 20 Jan 2016 15:48:04 -0800
From:	Dan Williams <dan.j.williams@...el.com>
To:	Kees Cook <keescook@...omium.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Larry Finger <Larry.Finger@...inger.net>
Subject: Re: [PATCH] fix CONFIG_IO_STRICT_DEVMEM, do not enable by default

On Wed, Jan 20, 2016 at 3:12 PM, Kees Cook <keescook@...omium.org> wrote:
> On Wed, Jan 20, 2016 at 2:37 PM, Dan Williams <dan.j.williams@...el.com> wrote:
>> Larry reports: "My PowerBook G4 Aluminum with a 32-bit PPC processor
>> fails to boot for the 4.4-git series".  This is likely due to X still
>> needing /dev/mem access on this platform.
>>
>> CONFIG_IO_STRICT_DEVMEM is not yet safe to turn on when
>> CONFIG_STRICT_DEVMEM=y.  Remove the default so that old configurations
>> do not change behavior.
>>
>> Fixes: 90a545e98126 ("restrict /dev/mem to idle io memory ranges")
>> Reported-by: Larry Finger <Larry.Finger@...inger.net>
>> Tested-by: Larry Finger <Larry.Finger@...inger.net>
>> Link: http://marc.info/?l=linux-kernel&m=145332012023825&w=2
>> Cc: Arnd Bergmann <arnd@...db.de>
>> Cc: Ingo Molnar <mingo@...hat.com>
>> Cc: Kees Cook <keescook@...omium.org>
>> Cc: Russell King <linux@....linux.org.uk>
>> Cc: Andrew Morton <akpm@...ux-foundation.org>
>> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
>
> Acked-by: Kees Cook <keescook@...omium.org>
>

Thanks!

> This should probably be CC: stable, yes?

No, this breakage is new for the current merge window.