Question: how to make one page readonly on ARM
chaoys155 at gmail.com
Thu Feb 16 20:01:05 EST 2012
I just want to alloc some readonly pages to detect memory corruption.
is it workable?
2012/2/17, Nicolas Pitre <nico at fluxnic.net>:
> On Thu, 16 Feb 2012, 晁永生 wrote:
>> 2012/2/16 Russell King - ARM Linux <linux at arm.linux.org.uk>:
>> > On Thu, Feb 16, 2012 at 12:54:27PM +0800, 晁永生 wrote:
>> >> Hi,
>> >> I get one page by __get_free_page and can make it readonly by
>> >> set_memory_ro on X86,
>> >> but how to do this on ARM?
>> > You can't, because we map all kernel space with 1MB section mappings.
>> sorry, I don't quite understand. I am kernel newbie.
>> Do you mean that if I want to make one memory region readonly, it has
>> to be in MB unit?
>> Does ARM kernel have any functions similar to set_memory_ro?
> Maybe if you tell us more about what your end goal is, we might be able
> to suggest alternatives for solving your problem.
Thanks a lot!
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