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

[Dan Williams]

On Wed, Jan 20, 2016 at 3:12 PM, Kees Cook <keescook@xxxxxxxxxxxx> wrote:
> On Wed, Jan 20, 2016 at 2:37 PM, Dan Williams <dan.j.williams@xxxxxxxxx> 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@xxxxxxxxxxxx>
>> Tested-by: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
>> Link: http://marc.info/?l=linux-kernel&m=145332012023825&w=2
>> Cc: Arnd Bergmann <arnd@xxxxxxxx>
>> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
>> Cc: Kees Cook <keescook@xxxxxxxxxxxx>
>> Cc: Russell King <linux@xxxxxxxxxxxxxxxx>
>> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
>> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
>> Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
>
> Acked-by: Kees Cook <keescook@xxxxxxxxxxxx>
>

Thanks!

> This should probably be CC: stable, yes?

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