Query : Regarding overwriting of DTB loading region while clearing BSS section

Kohli, Gaurav gkohli at codeaurora.org
Tue Jan 16 22:04:25 PST 2018

Adding Chandra , He has some made some patch related to this.

On 11/23/2017 11:51 PM, Mark Rutland wrote:

> On Thu, Nov 23, 2017 at 10:26:07PM +0530, Kohli, Gaurav wrote:
>> Hi Mark,
>> Thanks for the reply,
>> Actually, We solved our issue by removing unwanted code from kernel,
> I would very strongly recommend that you update your bootladoer/firmware
> to respect image_size, since any numbero f things may increase the size
> of the kernel in future.
> i.e. trimmign the kernel down is a workaround, but not a fix.
>> But my request can't we put some check itself in head.s during clear
>> of BSS region to check whether dtb is intact or not.  Because
>> ultimately it will fail in start kernel.
>> At that point(start_kernel),  we can not directly say what is the root cause
>> for this overriding.
> Perhaps we could add a check in setup_arch(). If the DTB pointer
> overlaps any part of the kerenl (BSS included), the bootloader is
> clearly broken.
> Even then, it's going to be a slient panic(), since we won't be able to
> parse anything out of the DTB...
> Thanks,
> Mark.
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